diff --git a/Documentation/CodingGuidelines b/Documentation/CodingGuidelines
index 9d5c278..003393e 100644
--- a/Documentation/CodingGuidelines
+++ b/Documentation/CodingGuidelines
@@ -442,8 +442,12 @@
    detail.
 
  - The first #include in C files, except in platform specific compat/
-   implementations, must be either "git-compat-util.h", "cache.h" or
-   "builtin.h".  You do not have to include more than one of these.
+   implementations and sha1dc/, must be either "git-compat-util.h" or
+   one of the approved headers that includes it first for you.  (The
+   approved headers currently include "cache.h", "builtin.h",
+   "t/helper/test-tool.h", "xdiff/xinclude.h", or
+   "reftable/system.h").  You do not have to include more than one of
+   these.
 
  - A C file must directly include the header files that declare the
    functions and the types it uses, except for the functions and types
diff --git a/Documentation/RelNotes/2.41.0.txt b/Documentation/RelNotes/2.41.0.txt
new file mode 100644
index 0000000..5db6f1b
--- /dev/null
+++ b/Documentation/RelNotes/2.41.0.txt
@@ -0,0 +1,106 @@
+Git v2.41 Release Notes
+=======================
+
+UI, Workflows & Features
+
+ * Allow information carried on the WWW-AUthenticate header to be
+   passed to the credential helpers.
+
+ * A new "fetch.hideRefs" option can be used to exclude specified refs
+   from "rev-list --objects --stdin --not --all" traversal for
+   checking object connectivity, most useful when there are many
+   unrelated histories in a single repository.
+
+ * "git push" has been taught to allow deletion of refs with one-level
+   names to help repairing a repository who acquired such a ref by
+   mistake.  In general, we don't encourage use of such a ref, and
+   creation or update to such a ref is rejected as before.
+
+ * Allow "git bisect reset" to check out the original branch when the
+   branch is already checked out in a different worktree linked to the
+   same repository.
+
+ * A few subcommands have been taught to stop users from working on a
+   branch that is being used in another worktree linked to the same
+   repository.
+
+ * "git format-patch" learned to write a log-message only output file
+   for empty commits.
+
+ * "git format-patch" honors the src/dst prefixes set to nonstandard
+   values with configuration variables like "diff.noprefix", causing
+   receiving end of the patch that expects the standard -p1 format to
+   break.  "format-patch" has been taught to ignore end-user configuration
+   and always use the standard prefixes.
+
+   This is a backward compatibility breaking change.
+
+
+Performance, Internal Implementation, Development Support etc.
+
+ * Code clean-up to clarify directory traversal API.
+
+ * Code clean-up to clarify the rule that "git-compat-util.h" must be
+   the first to be included.
+
+ * More work towards -Wunused.
+
+ * Instead of forcing each command to choose to honor GPG related
+   configuration variables, make the subsystem lazily initialize
+   itself.
+
+
+Fixes since v2.40
+-----------------
+
+ * "git fsck" learned to check the index files in other worktrees,
+   just like "git gc" honors them as anchoring points.
+   (merge 8d3e7eac52 jk/fsck-indices-in-worktrees later to maint).
+
+ * Fix a segfaulting loop.  The function and its caller may need
+   further clean-up.
+   (merge c5773dc078 ew/commit-reach-clean-up-flags-fix later to maint).
+
+ * "git restore" supports options like "--ours" that are only
+   meaningful during a conflicted merge, but these options are only
+   meaningful when updating the working tree files.  These options are
+   marked to be incompatible when both "--staged" and "--worktree" are
+   in effect.
+   (merge ee8a88826a ak/restore-both-incompatible-with-conflicts later to maint).
+
+ * Simplify UI to control progress meter given by "git bundle" command.
+   (merge 8b95521edb jk/bundle-progress later to maint).
+
+ * "git bundle" learned that "-" is a common way to say that the input
+   comes from the standard input and/or the output goes to the
+   standard output.  It used to work only for output and only from the
+   root level of the working tree.
+   (merge 0bbe10313e jk/bundle-use-dash-for-stdfiles later to maint).
+
+ * Once we start running, we assumed that the list of alternate object
+   databases would never change.  Hook into the machinery used to
+   update the list of packfiles during runtime to update this list as
+   well.
+   (merge e2d003dbed ds/reprepare-alternates-when-repreparing-packfiles later to maint).
+
+ * The code to parse "git rebase -X<opt>" was not prepared to see an
+   unparsable option string, which has been corrected.
+   (merge 15a4cc912e ab/fix-strategy-opts-parsing later to maint).
+
+ * "git add -p" while the index is unmerged sometimes failed to parse
+   the diff output it internally produces and died, which has been
+   corrected.
+   (merge 28d1122f9c jk/add-p-unmerged-fix later to maint).
+
+ * Fix for a "ls-files --format="%(path)" that produced nonsense
+   output, which was a bug in 2.38.
+   (merge cfb62dd006 aj/ls-files-format-fix later to maint).
+
+ * "git receive-pack" that responds to "git push" requests failed to
+   clean a stale lockfile when killed in the middle, which has been
+   corrected.
+   (merge c55c30669c ps/receive-pack-unlock-before-die later to maint).
+
+ * Other code cleanup, docfix, build fix, etc.
+   (merge f7111175df as/doc-markup-fix later to maint).
+   (merge 90ff7c9898 fc/test-aggregation-clean-up later to maint).
diff --git a/Documentation/config/advice.txt b/Documentation/config/advice.txt
index a00d010..c96b5b2 100644
--- a/Documentation/config/advice.txt
+++ b/Documentation/config/advice.txt
@@ -136,4 +136,6 @@
 		Advice shown when either linkgit:git-add[1] or linkgit:git-rm[1]
 		is asked to update index entries outside the current sparse
 		checkout.
+	diverging::
+		Advice shown when a fast-forward is not possible.
 --
diff --git a/Documentation/config/format.txt b/Documentation/config/format.txt
index 73678d8..8cf6f00 100644
--- a/Documentation/config/format.txt
+++ b/Documentation/config/format.txt
@@ -144,3 +144,10 @@
 format.mboxrd::
 	A boolean value which enables the robust "mboxrd" format when
 	`--stdout` is in use to escape "^>+From " lines.
+
+format.noprefix::
+	If set, do not show any source or destination prefix in patches.
+	This is equivalent to the `diff.noprefix` option used by `git
+	diff` (but which is not respected by `format-patch`). Note that
+	by setting this, the receiver of any patches you generate will
+	have to apply them using the `-p0` option.
diff --git a/Documentation/diff-options.txt b/Documentation/diff-options.txt
index 7d73e97..08ab861 100644
--- a/Documentation/diff-options.txt
+++ b/Documentation/diff-options.txt
@@ -852,6 +852,11 @@
 --no-prefix::
 	Do not show any source or destination prefix.
 
+--default-prefix::
+	Use the default source and destination prefixes ("a/" and "b/").
+	This is usually the default already, but may be used to override
+	config such as `diff.noprefix`.
+
 --line-prefix=<prefix>::
 	Prepend an additional prefix to every line of output.
 
diff --git a/Documentation/git-bundle.txt b/Documentation/git-bundle.txt
index 18a022b..3ab42a1 100644
--- a/Documentation/git-bundle.txt
+++ b/Documentation/git-bundle.txt
@@ -9,7 +9,7 @@
 SYNOPSIS
 --------
 [verse]
-'git bundle' create [-q | --quiet | --progress | --all-progress] [--all-progress-implied]
+'git bundle' create [-q | --quiet | --progress]
 		    [--version=<version>] <file> <git-rev-list-args>
 'git bundle' verify [-q | --quiet] <file>
 'git bundle' list-heads <file> [<refname>...]
@@ -66,7 +66,7 @@
 	Used to create a bundle named 'file'.  This requires the
 	'<git-rev-list-args>' arguments to define the bundle contents.
 	'options' contains the options specific to the 'git bundle create'
-	subcommand.
+	subcommand. If 'file' is `-`, the bundle is written to stdout.
 
 verify <file>::
 	Used to check that a bundle file is valid and will apply
@@ -77,12 +77,13 @@
 	Finally, information about additional capabilities, such as "object
 	filter", is printed. See "Capabilities" in linkgit:gitformat-bundle[5]
 	for more information. The exit code is zero for success, but will
-	be nonzero if the bundle file is invalid.
+	be nonzero if the bundle file is invalid. If 'file' is `-`, the
+	bundle is read from stdin.
 
 list-heads <file>::
 	Lists the references defined in the bundle.  If followed by a
 	list of references, only references matching those given are
-	printed out.
+	printed out. If 'file' is `-`, the bundle is read from stdin.
 
 unbundle <file>::
 	Passes the objects in the bundle to 'git index-pack'
@@ -90,6 +91,7 @@
 	defined references. If a list of references is given, only
 	references matching those in the list are printed. This command is
 	really plumbing, intended to be called only by 'git fetch'.
+	If 'file' is `-`, the bundle is read from stdin.
 
 <git-rev-list-args>::
 	A list of arguments, acceptable to 'git rev-parse' and
@@ -115,22 +117,6 @@
 	is specified. This flag forces progress status even if
 	the standard error stream is not directed to a terminal.
 
---all-progress::
-	When --stdout is specified then progress report is
-	displayed during the object count and compression phases
-	but inhibited during the write-out phase. The reason is
-	that in some cases the output stream is directly linked
-	to another command which may wish to display progress
-	status of its own as it processes incoming pack data.
-	This flag is like --progress except that it forces progress
-	report for the write-out phase as well even if --stdout is
-	used.
-
---all-progress-implied::
-	This is used to imply --all-progress whenever progress display
-	is activated.  Unlike --all-progress this flag doesn't actually
-	force any progress display by itself.
-
 --version=<version>::
 	Specify the bundle version.  Version 2 is the older format and can only be
 	used with SHA-1 repositories; the newer version 3 contains capabilities that
diff --git a/Documentation/git-credential.txt b/Documentation/git-credential.txt
index 29d184a..3394c03 100644
--- a/Documentation/git-credential.txt
+++ b/Documentation/git-credential.txt
@@ -113,7 +113,13 @@
 The key may contain any bytes except `=`, newline, or NUL. The value may
 contain any bytes except newline or NUL.
 
-In both cases, all bytes are treated as-is (i.e., there is no quoting,
+Attributes with keys that end with C-style array brackets `[]` can have
+multiple values. Each instance of a multi-valued attribute forms an
+ordered list of values - the order of the repeated attributes defines
+the order of the values. An empty multi-valued attribute (`key[]=\n`)
+acts to clear any previous entries and reset the list.
+
+In all cases, all bytes are treated as-is (i.e., there is no quoting,
 and one cannot transmit a value with newline or NUL in it). The list of
 attributes is terminated by a blank line or end-of-file.
 
@@ -166,6 +172,17 @@
 Components which are missing from the URL (e.g., there is no
 username in the example above) will be left unset.
 
+`wwwauth[]`::
+
+	When an HTTP response is received by Git that includes one or more
+	'WWW-Authenticate' authentication headers, these will be passed by Git
+	to credential helpers.
++
+Each 'WWW-Authenticate' header value is passed as a multi-valued
+attribute 'wwwauth[]', where the order of the attributes is the same as
+they appear in the HTTP response. This attribute is 'one-way' from Git
+to pass additional information to credential helpers.
+
 Unrecognised attributes are silently discarded.
 
 GIT
diff --git a/Documentation/git-merge-tree.txt b/Documentation/git-merge-tree.txt
index 88ee942..ffc4fbf 100644
--- a/Documentation/git-merge-tree.txt
+++ b/Documentation/git-merge-tree.txt
@@ -108,7 +108,7 @@
 
      0: merge had conflicts
      1: merge was clean
-     &lt;0: something prevented the merge from running (e.g. access to repository
+     <0: something prevented the merge from running (e.g. access to repository
 	 objects denied by filesystem)
 
 [[OIDTLT]]
diff --git a/Documentation/git-rev-parse.txt b/Documentation/git-rev-parse.txt
index bcd8069..f26a759 100644
--- a/Documentation/git-rev-parse.txt
+++ b/Documentation/git-rev-parse.txt
@@ -197,10 +197,11 @@
 or `--all`. If a trailing '/{asterisk}' is intended, it must be given
 explicitly.
 
---exclude-hidden=[receive|uploadpack]::
-	Do not include refs that would be hidden by `git-receive-pack` or
-	`git-upload-pack` by consulting the appropriate `receive.hideRefs` or
-	`uploadpack.hideRefs` configuration along with `transfer.hideRefs` (see
+--exclude-hidden=[fetch|receive|uploadpack]::
+	Do not include refs that would be hidden by `git-fetch`,
+	`git-receive-pack` or `git-upload-pack` by consulting the appropriate
+	`fetch.hideRefs`, `receive.hideRefs` or `uploadpack.hideRefs`
+	configuration along with `transfer.hideRefs` (see
 	linkgit:git-config[1]). This option affects the next pseudo-ref option
 	`--all` or `--glob` and is cleared after processing them.
 
diff --git a/Documentation/rev-list-options.txt b/Documentation/rev-list-options.txt
index 0d90d5b..90c73d6 100644
--- a/Documentation/rev-list-options.txt
+++ b/Documentation/rev-list-options.txt
@@ -195,10 +195,11 @@
 or `--all`. If a trailing '/{asterisk}' is intended, it must be given
 explicitly.
 
---exclude-hidden=[receive|uploadpack]::
-	Do not include refs that would be hidden by `git-receive-pack` or
-	`git-upload-pack` by consulting the appropriate `receive.hideRefs` or
-	`uploadpack.hideRefs` configuration along with `transfer.hideRefs` (see
+--exclude-hidden=[fetch|receive|uploadpack]::
+	Do not include refs that would be hidden by `git-fetch`,
+	`git-receive-pack` or `git-upload-pack` by consulting the appropriate
+	`fetch.hideRefs`, `receive.hideRefs` or `uploadpack.hideRefs`
+	configuration along with `transfer.hideRefs` (see
 	linkgit:git-config[1]). This option affects the next pseudo-ref option
 	`--all` or `--glob` and is cleared after processing them.
 
diff --git a/GIT-VERSION-GEN b/GIT-VERSION-GEN
index a87f0ad..9a1111a 100755
--- a/GIT-VERSION-GEN
+++ b/GIT-VERSION-GEN
@@ -1,7 +1,7 @@
 #!/bin/sh
 
 GVF=GIT-VERSION-FILE
-DEF_VER=v2.40.0
+DEF_VER=v2.40.GIT
 
 LF='
 '
diff --git a/RelNotes b/RelNotes
index 47807bf..4da73c9 120000
--- a/RelNotes
+++ b/RelNotes
@@ -1 +1 @@
-Documentation/RelNotes/2.40.0.txt
\ No newline at end of file
+Documentation/RelNotes/2.41.0.txt
\ No newline at end of file
diff --git a/abspath.c b/abspath.c
index 39e06b5..9a81c55 100644
--- a/abspath.c
+++ b/abspath.c
@@ -280,3 +280,10 @@
 #endif
 	return strbuf_detach(&path, NULL);
 }
+
+char *prefix_filename_except_for_dash(const char *pfx, const char *arg)
+{
+	if (!strcmp(arg, "-"))
+		return xstrdup(arg);
+	return prefix_filename(pfx, arg);
+}
diff --git a/add-interactive.c b/add-interactive.c
index 00a0f6f..ae25ec5 100644
--- a/add-interactive.c
+++ b/add-interactive.c
@@ -3,6 +3,7 @@
 #include "color.h"
 #include "config.h"
 #include "diffcore.h"
+#include "hex.h"
 #include "revision.h"
 #include "refs.h"
 #include "string-list.h"
diff --git a/add-patch.c b/add-patch.c
index a86a92e..e6c34b9 100644
--- a/add-patch.c
+++ b/add-patch.c
@@ -1,5 +1,6 @@
 #include "cache.h"
 #include "add-interactive.h"
+#include "alloc.h"
 #include "strbuf.h"
 #include "run-command.h"
 #include "strvec.h"
@@ -483,7 +484,8 @@
 		if (!eol)
 			eol = pend;
 
-		if (starts_with(p, "diff ")) {
+		if (starts_with(p, "diff ") ||
+		    starts_with(p, "* Unmerged path ")) {
 			complete_file(marker, hunk);
 			ALLOC_GROW_BY(s->file_diff, s->file_diff_nr, 1,
 				   file_diff_alloc);
diff --git a/advice.c b/advice.c
index fd18968..d623243 100644
--- a/advice.c
+++ b/advice.c
@@ -1,6 +1,8 @@
-#include "cache.h"
+#include "git-compat-util.h"
+#include "advice.h"
 #include "config.h"
 #include "color.h"
+#include "gettext.h"
 #include "help.h"
 #include "string-list.h"
 
@@ -44,6 +46,7 @@
 	[ADVICE_COMMIT_BEFORE_MERGE]			= { "commitBeforeMerge", 1 },
 	[ADVICE_DETACHED_HEAD]				= { "detachedHead", 1 },
 	[ADVICE_SUGGEST_DETACHING_HEAD]			= { "suggestDetachingHead", 1 },
+	[ADVICE_DIVERGING]				= { "diverging", 1 },
 	[ADVICE_FETCH_SHOW_FORCED_UPDATES]		= { "fetchShowForcedUpdates", 1 },
 	[ADVICE_GRAFT_FILE_DEPRECATED]			= { "graftFileDeprecated", 1 },
 	[ADVICE_IGNORED_HOOK]				= { "ignoredHook", 1 },
@@ -217,6 +220,14 @@
 
 void NORETURN die_ff_impossible(void)
 {
+	advise_if_enabled(ADVICE_DIVERGING,
+		_("Diverging branches can't be fast-forwarded, you need to either:\n"
+		"\n"
+		"\tgit merge --no-ff\n"
+		"\n"
+		"or:\n"
+		"\n"
+		"\tgit rebase\n"));
 	die(_("Not possible to fast-forward, aborting."));
 }
 
diff --git a/advice.h b/advice.h
index 07e0f76..0f58416 100644
--- a/advice.h
+++ b/advice.h
@@ -1,8 +1,6 @@
 #ifndef ADVICE_H
 #define ADVICE_H
 
-#include "git-compat-util.h"
-
 struct string_list;
 
 /*
@@ -21,6 +19,7 @@
 	ADVICE_CHECKOUT_AMBIGUOUS_REMOTE_BRANCH_NAME,
 	ADVICE_COMMIT_BEFORE_MERGE,
 	ADVICE_DETACHED_HEAD,
+	ADVICE_DIVERGING,
 	ADVICE_SUGGEST_DETACHING_HEAD,
 	ADVICE_FETCH_SHOW_FORCED_UPDATES,
 	ADVICE_GRAFT_FILE_DEPRECATED,
diff --git a/alias.c b/alias.c
index 00abde0..e814948 100644
--- a/alias.c
+++ b/alias.c
@@ -1,6 +1,8 @@
-#include "cache.h"
+#include "git-compat-util.h"
 #include "alias.h"
+#include "alloc.h"
 #include "config.h"
+#include "gettext.h"
 #include "string-list.h"
 
 struct config_alias_data {
diff --git a/alloc.c b/alloc.c
index 27f697e..2886aa9 100644
--- a/alloc.c
+++ b/alloc.c
@@ -8,7 +8,7 @@
  * up with maximal alignment because it doesn't know what the object alignment
  * for the new allocation is.
  */
-#include "cache.h"
+#include "git-compat-util.h"
 #include "object.h"
 #include "blob.h"
 #include "tree.h"
diff --git a/alloc.h b/alloc.h
index 3f4a0ad..4312db4 100644
--- a/alloc.h
+++ b/alloc.h
@@ -17,4 +17,79 @@
 struct alloc_state *allocate_alloc_state(void);
 void clear_alloc_state(struct alloc_state *s);
 
+#define alloc_nr(x) (((x)+16)*3/2)
+
+/**
+ * Dynamically growing an array using realloc() is error prone and boring.
+ *
+ * Define your array with:
+ *
+ * - a pointer (`item`) that points at the array, initialized to `NULL`
+ *   (although please name the variable based on its contents, not on its
+ *   type);
+ *
+ * - an integer variable (`alloc`) that keeps track of how big the current
+ *   allocation is, initialized to `0`;
+ *
+ * - another integer variable (`nr`) to keep track of how many elements the
+ *   array currently has, initialized to `0`.
+ *
+ * Then before adding `n`th element to the item, call `ALLOC_GROW(item, n,
+ * alloc)`.  This ensures that the array can hold at least `n` elements by
+ * calling `realloc(3)` and adjusting `alloc` variable.
+ *
+ * ------------
+ * sometype *item;
+ * size_t nr;
+ * size_t alloc
+ *
+ * for (i = 0; i < nr; i++)
+ * 	if (we like item[i] already)
+ * 		return;
+ *
+ * // we did not like any existing one, so add one
+ * ALLOC_GROW(item, nr + 1, alloc);
+ * item[nr++] = value you like;
+ * ------------
+ *
+ * You are responsible for updating the `nr` variable.
+ *
+ * If you need to specify the number of elements to allocate explicitly
+ * then use the macro `REALLOC_ARRAY(item, alloc)` instead of `ALLOC_GROW`.
+ *
+ * Consider using ALLOC_GROW_BY instead of ALLOC_GROW as it has some
+ * added niceties.
+ *
+ * DO NOT USE any expression with side-effect for 'x', 'nr', or 'alloc'.
+ */
+#define ALLOC_GROW(x, nr, alloc) \
+	do { \
+		if ((nr) > alloc) { \
+			if (alloc_nr(alloc) < (nr)) \
+				alloc = (nr); \
+			else \
+				alloc = alloc_nr(alloc); \
+			REALLOC_ARRAY(x, alloc); \
+		} \
+	} while (0)
+
+/*
+ * Similar to ALLOC_GROW but handles updating of the nr value and
+ * zeroing the bytes of the newly-grown array elements.
+ *
+ * DO NOT USE any expression with side-effect for any of the
+ * arguments.
+ */
+#define ALLOC_GROW_BY(x, nr, increase, alloc) \
+	do { \
+		if (increase) { \
+			size_t new_nr = nr + (increase); \
+			if (new_nr < nr) \
+				BUG("negative growth in ALLOC_GROW_BY"); \
+			ALLOC_GROW(x, new_nr, alloc); \
+			memset((x) + nr, 0, sizeof(*(x)) * (increase)); \
+			nr = new_nr; \
+		} \
+	} while (0)
+
 #endif
diff --git a/apply.c b/apply.c
index 5cc5479..8776ab9 100644
--- a/apply.c
+++ b/apply.c
@@ -8,12 +8,14 @@
  */
 
 #include "cache.h"
+#include "alloc.h"
 #include "config.h"
 #include "object-store.h"
 #include "blob.h"
 #include "delta.h"
 #include "diff.h"
 #include "dir.h"
+#include "hex.h"
 #include "xdiff-interface.h"
 #include "ll-merge.h"
 #include "lockfile.h"
diff --git a/archive-tar.c b/archive-tar.c
index f8fad294..ee27fa0 100644
--- a/archive-tar.c
+++ b/archive-tar.c
@@ -1,8 +1,10 @@
 /*
  * Copyright (c) 2005, 2006 Rene Scharfe
  */
-#include "cache.h"
+#include "git-compat-util.h"
+#include "alloc.h"
 #include "config.h"
+#include "hex.h"
 #include "tar.h"
 #include "archive.h"
 #include "object-store.h"
diff --git a/archive-zip.c b/archive-zip.c
index 0456f1e..c5d1f72 100644
--- a/archive-zip.c
+++ b/archive-zip.c
@@ -4,6 +4,7 @@
 #include "cache.h"
 #include "config.h"
 #include "archive.h"
+#include "hex.h"
 #include "streaming.h"
 #include "utf8.h"
 #include "object-store.h"
diff --git a/archive.c b/archive.c
index 9aeaf2b..1c2ca78 100644
--- a/archive.c
+++ b/archive.c
@@ -1,5 +1,7 @@
-#include "cache.h"
+#include "git-compat-util.h"
+#include "alloc.h"
 #include "config.h"
+#include "hex.h"
 #include "refs.h"
 #include "object-store.h"
 #include "commit.h"
diff --git a/attr.c b/attr.c
index 1053dfc..657ee52 100644
--- a/attr.c
+++ b/attr.c
@@ -7,6 +7,7 @@
  */
 
 #include "cache.h"
+#include "alloc.h"
 #include "config.h"
 #include "exec-cmd.h"
 #include "attr.h"
diff --git a/bisect.c b/bisect.c
index ef5ee5a..1409150 100644
--- a/bisect.c
+++ b/bisect.c
@@ -2,6 +2,7 @@
 #include "config.h"
 #include "commit.h"
 #include "diff.h"
+#include "hex.h"
 #include "revision.h"
 #include "refs.h"
 #include "list-objects.h"
diff --git a/blame.c b/blame.c
index 8bfeaa1..e45d8a3 100644
--- a/blame.c
+++ b/blame.c
@@ -5,6 +5,7 @@
 #include "mergesort.h"
 #include "diff.h"
 #include "diffcore.h"
+#include "hex.h"
 #include "tag.h"
 #include "blame.h"
 #include "alloc.h"
diff --git a/blame.h b/blame.h
index 38bde53..b60d1d8 100644
--- a/blame.h
+++ b/blame.h
@@ -1,7 +1,6 @@
 #ifndef BLAME_H
 #define BLAME_H
 
-#include "cache.h"
 #include "commit.h"
 #include "xdiff-interface.h"
 #include "revision.h"
diff --git a/blob.c b/blob.c
index 8f83523..888e28a 100644
--- a/blob.c
+++ b/blob.c
@@ -1,4 +1,4 @@
-#include "cache.h"
+#include "git-compat-util.h"
 #include "blob.h"
 #include "repository.h"
 #include "alloc.h"
diff --git a/branch.c b/branch.c
index e5614b5..eacef62 100644
--- a/branch.c
+++ b/branch.c
@@ -2,6 +2,7 @@
 #include "cache.h"
 #include "config.h"
 #include "branch.h"
+#include "hex.h"
 #include "refs.h"
 #include "refspec.h"
 #include "remote.h"
@@ -820,12 +821,16 @@
 void die_if_checked_out(const char *branch, int ignore_current_worktree)
 {
 	struct worktree **worktrees = get_worktrees();
-	const struct worktree *wt;
 
-	wt = find_shared_symref(worktrees, "HEAD", branch);
-	if (wt && (!ignore_current_worktree || !wt->is_current)) {
-		skip_prefix(branch, "refs/heads/", &branch);
-		die(_("'%s' is already checked out at '%s'"), branch, wt->path);
+	for (int i = 0; worktrees[i]; i++) {
+		if (worktrees[i]->is_current && ignore_current_worktree)
+			continue;
+
+		if (is_shared_symref(worktrees[i], "HEAD", branch)) {
+			skip_prefix(branch, "refs/heads/", &branch);
+			die(_("'%s' is already checked out at '%s'"),
+				branch, worktrees[i]->path);
+		}
 	}
 
 	free_worktrees(worktrees);
diff --git a/builtin/am.c b/builtin/am.c
index e0848dd..5e6b237 100644
--- a/builtin/am.c
+++ b/builtin/am.c
@@ -8,6 +8,7 @@
 #include "config.h"
 #include "builtin.h"
 #include "exec-cmd.h"
+#include "hex.h"
 #include "parse-options.h"
 #include "dir.h"
 #include "run-command.h"
@@ -2300,17 +2301,6 @@
 	return 0;
 }
 
-static int git_am_config(const char *k, const char *v, void *cb UNUSED)
-{
-	int status;
-
-	status = git_gpg_config(k, v, NULL);
-	if (status)
-		return status;
-
-	return git_default_config(k, v, NULL);
-}
-
 int cmd_am(int argc, const char **argv, const char *prefix)
 {
 	struct am_state state;
@@ -2434,7 +2424,7 @@
 	if (argc == 2 && !strcmp(argv[1], "-h"))
 		usage_with_options(usage, options);
 
-	git_config(git_am_config, NULL);
+	git_config(git_default_config, NULL);
 
 	am_state_init(&state);
 
diff --git a/builtin/archive.c b/builtin/archive.c
index f094390..d0a583e 100644
--- a/builtin/archive.c
+++ b/builtin/archive.c
@@ -81,7 +81,7 @@
 int cmd_archive(int argc, const char **argv, const char *prefix)
 {
 	const char *exec = "git-upload-archive";
-	const char *output = NULL;
+	char *output = NULL;
 	const char *remote = NULL;
 	struct option local_opts[] = {
 		OPT_FILENAME('o', "output", &output,
@@ -106,5 +106,6 @@
 
 	setvbuf(stderr, NULL, _IOLBF, BUFSIZ);
 
+	UNLEAK(output);
 	return write_archive(argc, argv, prefix, the_repository, output, 0);
 }
diff --git a/builtin/bisect.c b/builtin/bisect.c
index 7301740..c64c8d7 100644
--- a/builtin/bisect.c
+++ b/builtin/bisect.c
@@ -1,5 +1,6 @@
 #include "builtin.h"
 #include "cache.h"
+#include "hex.h"
 #include "parse-options.h"
 #include "bisect.h"
 #include "refs.h"
@@ -244,7 +245,8 @@
 		struct child_process cmd = CHILD_PROCESS_INIT;
 
 		cmd.git_cmd = 1;
-		strvec_pushl(&cmd.args, "checkout", branch.buf, "--", NULL);
+		strvec_pushl(&cmd.args, "checkout", "--ignore-other-worktrees",
+				branch.buf, "--", NULL);
 		if (run_command(&cmd)) {
 			error(_("could not check out original"
 				" HEAD '%s'. Try 'git bisect"
diff --git a/builtin/blame.c b/builtin/blame.c
index 71f925e..fdd9f0c 100644
--- a/builtin/blame.c
+++ b/builtin/blame.c
@@ -5,10 +5,12 @@
  * See COPYING for licensing conditions
  */
 
-#include "cache.h"
+#include "git-compat-util.h"
+#include "alloc.h"
 #include "config.h"
 #include "color.h"
 #include "builtin.h"
+#include "hex.h"
 #include "repository.h"
 #include "commit.h"
 #include "diff.h"
diff --git a/builtin/bundle.c b/builtin/bundle.c
index acceef6..666f01b 100644
--- a/builtin/bundle.c
+++ b/builtin/bundle.c
@@ -12,7 +12,7 @@
  */
 
 #define BUILTIN_BUNDLE_CREATE_USAGE \
-	N_("git bundle create [-q | --quiet | --progress | --all-progress] [--all-progress-implied]\n" \
+	N_("git bundle create [-q | --quiet | --progress]\n" \
 	   "                  [--version=<version>] <file> <git-rev-list-args>")
 #define BUILTIN_BUNDLE_VERIFY_USAGE \
 	N_("git bundle verify [-q | --quiet] <file>")
@@ -59,12 +59,12 @@
 			     PARSE_OPT_STOP_AT_NON_OPTION);
 	if (!argc)
 		usage_msg_opt(_("need a <file> argument"), usagestr, options);
-	*bundle_file = prefix_filename(prefix, argv[0]);
+	*bundle_file = prefix_filename_except_for_dash(prefix, argv[0]);
 	return argc;
 }
 
 static int cmd_bundle_create(int argc, const char **argv, const char *prefix) {
-	int all_progress_implied = 0;
+	int all_progress_implied = 1;
 	int progress = isatty(STDERR_FILENO);
 	struct strvec pack_opts;
 	int version = -1;
@@ -74,11 +74,12 @@
 			    N_("do not show progress meter"), 0),
 		OPT_SET_INT(0, "progress", &progress,
 			    N_("show progress meter"), 1),
-		OPT_SET_INT(0, "all-progress", &progress,
-			    N_("show progress meter during object writing phase"), 2),
-		OPT_BOOL(0, "all-progress-implied",
-			 &all_progress_implied,
-			 N_("similar to --all-progress when progress meter is shown")),
+		OPT_SET_INT_F(0, "all-progress", &progress,
+			      N_("historical; same as --progress"), 2,
+			      PARSE_OPT_HIDDEN),
+		OPT_HIDDEN_BOOL(0, "all-progress-implied",
+				&all_progress_implied,
+				N_("historical; does nothing")),
 		OPT_INTEGER(0, "version", &version,
 			    N_("specify bundle format version")),
 		OPT_END()
@@ -107,6 +108,23 @@
 	return ret;
 }
 
+/*
+ * Similar to read_bundle_header(), but handle "-" as stdin.
+ */
+static int open_bundle(const char *path, struct bundle_header *header,
+		       const char **name)
+{
+	if (!strcmp(path, "-")) {
+		if (name)
+			*name = "<stdin>";
+		return read_bundle_header_fd(0, header, "<stdin>");
+	}
+
+	if (name)
+		*name = path;
+	return read_bundle_header(path, header);
+}
+
 static int cmd_bundle_verify(int argc, const char **argv, const char *prefix) {
 	struct bundle_header header = BUNDLE_HEADER_INIT;
 	int bundle_fd = -1;
@@ -118,12 +136,13 @@
 		OPT_END()
 	};
 	char *bundle_file;
+	const char *name;
 
 	argc = parse_options_cmd_bundle(argc, argv, prefix,
 			builtin_bundle_verify_usage, options, &bundle_file);
 	/* bundle internals use argv[1] as further parameters */
 
-	if ((bundle_fd = read_bundle_header(bundle_file, &header)) < 0) {
+	if ((bundle_fd = open_bundle(bundle_file, &header, &name)) < 0) {
 		ret = 1;
 		goto cleanup;
 	}
@@ -134,7 +153,7 @@
 		goto cleanup;
 	}
 
-	fprintf(stderr, _("%s is okay\n"), bundle_file);
+	fprintf(stderr, _("%s is okay\n"), name);
 	ret = 0;
 cleanup:
 	free(bundle_file);
@@ -155,7 +174,7 @@
 			builtin_bundle_list_heads_usage, options, &bundle_file);
 	/* bundle internals use argv[1] as further parameters */
 
-	if ((bundle_fd = read_bundle_header(bundle_file, &header)) < 0) {
+	if ((bundle_fd = open_bundle(bundle_file, &header, NULL)) < 0) {
 		ret = 1;
 		goto cleanup;
 	}
@@ -185,7 +204,7 @@
 			builtin_bundle_unbundle_usage, options, &bundle_file);
 	/* bundle internals use argv[1] as further parameters */
 
-	if ((bundle_fd = read_bundle_header(bundle_file, &header)) < 0) {
+	if ((bundle_fd = open_bundle(bundle_file, &header, NULL)) < 0) {
 		ret = 1;
 		goto cleanup;
 	}
diff --git a/builtin/cat-file.c b/builtin/cat-file.c
index cc17635..9e7e03a 100644
--- a/builtin/cat-file.c
+++ b/builtin/cat-file.c
@@ -5,9 +5,12 @@
  */
 #define USE_THE_INDEX_VARIABLE
 #include "cache.h"
+#include "alloc.h"
 #include "config.h"
 #include "builtin.h"
 #include "diff.h"
+#include "hex.h"
+#include "ident.h"
 #include "parse-options.h"
 #include "userdiff.h"
 #include "streaming.h"
@@ -15,6 +18,7 @@
 #include "oid-array.h"
 #include "packfile.h"
 #include "object-store.h"
+#include "replace-object.h"
 #include "promisor-remote.h"
 #include "mailmap.h"
 
@@ -559,7 +563,7 @@
 }
 
 static int collect_loose_object(const struct object_id *oid,
-				const char *path,
+				const char *path UNUSED,
 				void *data)
 {
 	oid_array_append(data, oid);
@@ -567,8 +571,8 @@
 }
 
 static int collect_packed_object(const struct object_id *oid,
-				 struct packed_git *pack,
-				 uint32_t pos,
+				 struct packed_git *pack UNUSED,
+				 uint32_t pos UNUSED,
 				 void *data)
 {
 	oid_array_append(data, oid);
@@ -591,7 +595,7 @@
 }
 
 static int batch_unordered_loose(const struct object_id *oid,
-				 const char *path,
+				 const char *path UNUSED,
 				 void *data)
 {
 	return batch_unordered_object(oid, NULL, 0, data);
diff --git a/builtin/check-mailmap.c b/builtin/check-mailmap.c
index 7dc47e4..96db3dd 100644
--- a/builtin/check-mailmap.c
+++ b/builtin/check-mailmap.c
@@ -1,5 +1,6 @@
 #include "builtin.h"
 #include "config.h"
+#include "ident.h"
 #include "mailmap.h"
 #include "parse-options.h"
 #include "string-list.h"
diff --git a/builtin/checkout--worker.c b/builtin/checkout--worker.c
index ede7dc3..0a7d762 100644
--- a/builtin/checkout--worker.c
+++ b/builtin/checkout--worker.c
@@ -1,4 +1,5 @@
 #include "builtin.h"
+#include "alloc.h"
 #include "config.h"
 #include "entry.h"
 #include "parallel-checkout.h"
diff --git a/builtin/checkout.c b/builtin/checkout.c
index a5155cf..734d730 100644
--- a/builtin/checkout.c
+++ b/builtin/checkout.c
@@ -9,6 +9,7 @@
 #include "config.h"
 #include "diff.h"
 #include "dir.h"
+#include "hex.h"
 #include "hook.h"
 #include "ll-merge.h"
 #include "lockfile.h"
@@ -75,7 +76,7 @@
 	const char *ignore_unmerged_opt;
 	int ignore_unmerged;
 	int pathspec_file_nul;
-	const char *pathspec_from_file;
+	char *pathspec_from_file;
 
 	const char *new_branch;
 	const char *new_branch_force;
@@ -489,15 +490,28 @@
 		die(_("'%s' must be used when '%s' is not specified"),
 		    "--worktree", "--source");
 
-	if (opts->checkout_index && !opts->checkout_worktree &&
-	    opts->writeout_stage)
-		die(_("'%s' or '%s' cannot be used with %s"),
-		    "--ours", "--theirs", "--staged");
+	/*
+	 * Reject --staged option to the restore command when combined with
+	 * merge-related options. Use the accept_ref flag to distinguish it
+	 * from the checkout command, which does not accept --staged anyway.
+	 *
+	 * `restore --ours|--theirs --worktree --staged` could mean resolving
+	 * conflicted paths to one side in both the worktree and the index,
+	 * but does not currently.
+	 *
+	 * `restore --merge|--conflict=<style>` already recreates conflicts
+	 * in both the worktree and the index, so adding --staged would be
+	 * meaningless.
+	 */
+	if (!opts->accept_ref && opts->checkout_index) {
+		if (opts->writeout_stage)
+			die(_("'%s' or '%s' cannot be used with %s"),
+			    "--ours", "--theirs", "--staged");
 
-	if (opts->checkout_index && !opts->checkout_worktree &&
-	    opts->merge)
-		die(_("'%s' or '%s' cannot be used with %s"),
-		    "--merge", "--conflict", "--staged");
+		if (opts->merge)
+			die(_("'%s' or '%s' cannot be used with %s"),
+			    "--merge", "--conflict", "--staged");
+	}
 
 	if (opts->patch_mode) {
 		enum add_p_mode patch_mode;
@@ -1876,6 +1890,7 @@
 			    options, checkout_usage, &new_branch_info);
 	branch_info_release(&new_branch_info);
 	clear_pathspec(&opts.pathspec);
+	free(opts.pathspec_from_file);
 	FREE_AND_NULL(options);
 	return ret;
 }
diff --git a/builtin/clone.c b/builtin/clone.c
index 65b5b7d..462c286 100644
--- a/builtin/clone.c
+++ b/builtin/clone.c
@@ -11,6 +11,7 @@
 #define USE_THE_INDEX_VARIABLE
 #include "builtin.h"
 #include "config.h"
+#include "hex.h"
 #include "lockfile.h"
 #include "parse-options.h"
 #include "fetch-pack.h"
diff --git a/builtin/commit-graph.c b/builtin/commit-graph.c
index 93704f9..d3be7f3 100644
--- a/builtin/commit-graph.c
+++ b/builtin/commit-graph.c
@@ -1,12 +1,14 @@
 #include "builtin.h"
 #include "config.h"
 #include "dir.h"
+#include "hex.h"
 #include "lockfile.h"
 #include "parse-options.h"
 #include "repository.h"
 #include "commit-graph.h"
 #include "object-store.h"
 #include "progress.h"
+#include "replace-object.h"
 #include "tag.h"
 
 #define BUILTIN_COMMIT_GRAPH_VERIFY_USAGE \
diff --git a/builtin/commit-tree.c b/builtin/commit-tree.c
index cc8d584..e805da5 100644
--- a/builtin/commit-tree.c
+++ b/builtin/commit-tree.c
@@ -5,6 +5,7 @@
  */
 #include "cache.h"
 #include "config.h"
+#include "hex.h"
 #include "object-store.h"
 #include "repository.h"
 #include "commit.h"
@@ -37,14 +38,6 @@
 	commit_list_insert(parent, parents_p);
 }
 
-static int commit_tree_config(const char *var, const char *value, void *cb)
-{
-	int status = git_gpg_config(var, value, NULL);
-	if (status)
-		return status;
-	return git_default_config(var, value, cb);
-}
-
 static int parse_parent_arg_callback(const struct option *opt,
 		const char *arg, int unset)
 {
@@ -121,7 +114,7 @@
 		OPT_END()
 	};
 
-	git_config(commit_tree_config, NULL);
+	git_config(git_default_config, NULL);
 
 	if (argc < 2 || !strcmp(argv[1], "-h"))
 		usage_with_options(commit_tree_usage, options);
diff --git a/builtin/commit.c b/builtin/commit.c
index 985a044..f71ed41 100644
--- a/builtin/commit.c
+++ b/builtin/commit.c
@@ -1600,7 +1600,6 @@
 static int git_commit_config(const char *k, const char *v, void *cb)
 {
 	struct wt_status *s = cb;
-	int status;
 
 	if (!strcmp(k, "commit.template"))
 		return git_config_pathname(&template_file, k, v);
@@ -1620,9 +1619,6 @@
 		return 0;
 	}
 
-	status = git_gpg_config(k, v, NULL);
-	if (status)
-		return status;
 	return git_status_config(k, v, s);
 }
 
diff --git a/builtin/config.c b/builtin/config.c
index 060cf9f..49d832d 100644
--- a/builtin/config.c
+++ b/builtin/config.c
@@ -1,7 +1,8 @@
 #include "builtin.h"
-#include "cache.h"
+#include "alloc.h"
 #include "config.h"
 #include "color.h"
+#include "ident.h"
 #include "parse-options.h"
 #include "urlmatch.h"
 #include "quote.h"
diff --git a/builtin/count-objects.c b/builtin/count-objects.c
index 07b9419..bb21bc4 100644
--- a/builtin/count-objects.c
+++ b/builtin/count-objects.c
@@ -57,7 +57,8 @@
 		report_garbage(PACKDIR_FILE_GARBAGE, path);
 }
 
-static int count_loose(const struct object_id *oid, const char *path, void *data)
+static int count_loose(const struct object_id *oid, const char *path,
+		       void *data UNUSED)
 {
 	struct stat st;
 
@@ -72,7 +73,8 @@
 	return 0;
 }
 
-static int count_cruft(const char *basename, const char *path, void *data)
+static int count_cruft(const char *basename UNUSED, const char *path,
+		       void *data UNUSED)
 {
 	loose_garbage(path);
 	return 0;
diff --git a/builtin/credential-cache--daemon.c b/builtin/credential-cache--daemon.c
index 338058b..6e509d0 100644
--- a/builtin/credential-cache--daemon.c
+++ b/builtin/credential-cache--daemon.c
@@ -1,4 +1,5 @@
 #include "builtin.h"
+#include "alloc.h"
 #include "parse-options.h"
 
 #ifndef NO_UNIX_SOCKETS
diff --git a/builtin/describe.c b/builtin/describe.c
index eea1e33..5b5930f 100644
--- a/builtin/describe.c
+++ b/builtin/describe.c
@@ -1,6 +1,7 @@
 #define USE_THE_INDEX_VARIABLE
 #include "cache.h"
 #include "config.h"
+#include "hex.h"
 #include "lockfile.h"
 #include "commit.h"
 #include "tag.h"
diff --git a/builtin/diff-tree.c b/builtin/diff-tree.c
index 25b853b..a393efa 100644
--- a/builtin/diff-tree.c
+++ b/builtin/diff-tree.c
@@ -3,6 +3,7 @@
 #include "config.h"
 #include "diff.h"
 #include "commit.h"
+#include "hex.h"
 #include "log-tree.h"
 #include "builtin.h"
 #include "submodule.h"
diff --git a/builtin/difftool.c b/builtin/difftool.c
index dbbfb19..01681d0 100644
--- a/builtin/difftool.c
+++ b/builtin/difftool.c
@@ -17,6 +17,7 @@
 #include "builtin.h"
 #include "run-command.h"
 #include "exec-cmd.h"
+#include "hex.h"
 #include "parse-options.h"
 #include "strvec.h"
 #include "strbuf.h"
diff --git a/builtin/fast-export.c b/builtin/fast-export.c
index 39a890f..78493c6 100644
--- a/builtin/fast-export.c
+++ b/builtin/fast-export.c
@@ -6,6 +6,7 @@
 #include "builtin.h"
 #include "cache.h"
 #include "config.h"
+#include "hex.h"
 #include "refs.h"
 #include "refspec.h"
 #include "object-store.h"
diff --git a/builtin/fast-import.c b/builtin/fast-import.c
index 7134683..f7548ff 100644
--- a/builtin/fast-import.c
+++ b/builtin/fast-import.c
@@ -1,5 +1,6 @@
 #include "builtin.h"
 #include "cache.h"
+#include "hex.h"
 #include "repository.h"
 #include "config.h"
 #include "lockfile.h"
@@ -436,7 +437,7 @@
 
 #else
 
-static void checkpoint_signal(int signo)
+static void checkpoint_signal(int signo UNUSED)
 {
 	checkpoint_requested = 1;
 }
diff --git a/builtin/fetch-pack.c b/builtin/fetch-pack.c
index afe6793..d1a4306 100644
--- a/builtin/fetch-pack.c
+++ b/builtin/fetch-pack.c
@@ -1,4 +1,6 @@
 #include "builtin.h"
+#include "alloc.h"
+#include "hex.h"
 #include "pkt-line.h"
 #include "fetch-pack.h"
 #include "remote.h"
@@ -211,8 +213,8 @@
 		int flags = args.verbose ? CONNECT_VERBOSE : 0;
 		if (args.diag_url)
 			flags |= CONNECT_DIAG_URL;
-		conn = git_connect(fd, dest, args.uploadpack,
-				   flags);
+		conn = git_connect(fd, dest, "git-upload-pack",
+				   args.uploadpack, flags);
 		if (!conn)
 			return args.diag_url ? 0 : 1;
 	}
diff --git a/builtin/fetch.c b/builtin/fetch.c
index a09606b..7221e57 100644
--- a/builtin/fetch.c
+++ b/builtin/fetch.c
@@ -3,6 +3,7 @@
  */
 #include "cache.h"
 #include "config.h"
+#include "hex.h"
 #include "repository.h"
 #include "refs.h"
 #include "refspec.h"
@@ -1132,6 +1133,7 @@
 	if (!connectivity_checked) {
 		struct check_connected_options opt = CHECK_CONNECTED_INIT;
 
+		opt.exclude_hidden_refs_section = "fetch";
 		rm = ref_map;
 		if (check_connected(iterate_ref_map, &rm, &opt)) {
 			rc = error(_("%s did not send all necessary objects\n"), url);
@@ -1325,6 +1327,7 @@
 	}
 
 	opt.quiet = 1;
+	opt.exclude_hidden_refs_section = "fetch";
 	return check_connected(iterate_ref_map, &rm, &opt);
 }
 
@@ -1880,6 +1883,8 @@
 		strvec_push(argv, "--ipv4");
 	else if (family == TRANSPORT_FAMILY_IPV6)
 		strvec_push(argv, "--ipv6");
+	if (!write_fetch_head)
+		strvec_push(argv, "--no-write-fetch-head");
 }
 
 /* Fetch multiple remotes in parallel */
@@ -1890,7 +1895,8 @@
 	int next, result;
 };
 
-static int fetch_next_remote(struct child_process *cp, struct strbuf *out,
+static int fetch_next_remote(struct child_process *cp,
+			     struct strbuf *out UNUSED,
 			     void *cb, void **task_cb)
 {
 	struct parallel_fetch_state *state = cb;
@@ -1912,7 +1918,8 @@
 	return 1;
 }
 
-static int fetch_failed_to_start(struct strbuf *out, void *cb, void *task_cb)
+static int fetch_failed_to_start(struct strbuf *out UNUSED,
+				 void *cb, void *task_cb)
 {
 	struct parallel_fetch_state *state = cb;
 	const char *remote = task_cb;
diff --git a/builtin/fsck.c b/builtin/fsck.c
index d207bd9..c4a633c 100644
--- a/builtin/fsck.c
+++ b/builtin/fsck.c
@@ -1,6 +1,6 @@
-#define USE_THE_INDEX_VARIABLE
 #include "builtin.h"
 #include "cache.h"
+#include "hex.h"
 #include "repository.h"
 #include "config.h"
 #include "commit.h"
@@ -19,6 +19,7 @@
 #include "decorate.h"
 #include "packfile.h"
 #include "object-store.h"
+#include "replace-object.h"
 #include "resolve-undo.h"
 #include "run-command.h"
 #include "worktree.h"
@@ -233,17 +234,17 @@
 }
 
 static int mark_loose_unreachable_referents(const struct object_id *oid,
-					    const char *path,
-					    void *data)
+					    const char *path UNUSED,
+					    void *data UNUSED)
 {
 	mark_unreachable_referents(oid);
 	return 0;
 }
 
 static int mark_packed_unreachable_referents(const struct object_id *oid,
-					     struct packed_git *pack,
-					     uint32_t pos,
-					     void *data)
+					     struct packed_git *pack UNUSED,
+					     uint32_t pos UNUSED,
+					     void *data UNUSED)
 {
 	mark_unreachable_referents(oid);
 	return 0;
@@ -661,14 +662,15 @@
 	return 0; /* keep checking other objects, even if we saw an error */
 }
 
-static int fsck_cruft(const char *basename, const char *path, void *data)
+static int fsck_cruft(const char *basename, const char *path,
+		      void *data UNUSED)
 {
 	if (!starts_with(basename, "tmp_obj_"))
 		fprintf_ln(stderr, _("bad sha1 file: %s"), path);
 	return 0;
 }
 
-static int fsck_subdir(unsigned int nr, const char *path, void *data)
+static int fsck_subdir(unsigned int nr, const char *path UNUSED, void *data)
 {
 	struct for_each_loose_cb *cb_data = data;
 	struct progress *progress = cb_data->progress;
@@ -732,19 +734,19 @@
 	return 0;
 }
 
-static int fsck_cache_tree(struct cache_tree *it)
+static int fsck_cache_tree(struct cache_tree *it, const char *index_path)
 {
 	int i;
 	int err = 0;
 
 	if (verbose)
-		fprintf_ln(stderr, _("Checking cache tree"));
+		fprintf_ln(stderr, _("Checking cache tree of %s"), index_path);
 
 	if (0 <= it->entry_count) {
 		struct object *obj = parse_object(the_repository, &it->oid);
 		if (!obj) {
-			error(_("%s: invalid sha1 pointer in cache-tree"),
-			      oid_to_hex(&it->oid));
+			error(_("%s: invalid sha1 pointer in cache-tree of %s"),
+			      oid_to_hex(&it->oid), index_path);
 			errors_found |= ERROR_REFS;
 			return 1;
 		}
@@ -755,11 +757,12 @@
 			err |= objerror(obj, _("non-tree in cache-tree"));
 	}
 	for (i = 0; i < it->subtree_nr; i++)
-		err |= fsck_cache_tree(it->down[i]->cache_tree);
+		err |= fsck_cache_tree(it->down[i]->cache_tree, index_path);
 	return err;
 }
 
-static int fsck_resolve_undo(struct index_state *istate)
+static int fsck_resolve_undo(struct index_state *istate,
+			     const char *index_path)
 {
 	struct string_list_item *item;
 	struct string_list *resolve_undo = istate->resolve_undo;
@@ -782,8 +785,9 @@
 
 			obj = parse_object(the_repository, &ru->oid[i]);
 			if (!obj) {
-				error(_("%s: invalid sha1 pointer in resolve-undo"),
-				      oid_to_hex(&ru->oid[i]));
+				error(_("%s: invalid sha1 pointer in resolve-undo of %s"),
+				      oid_to_hex(&ru->oid[i]),
+				      index_path);
 				errors_found |= ERROR_REFS;
 				continue;
 			}
@@ -796,6 +800,38 @@
 	return 0;
 }
 
+static void fsck_index(struct index_state *istate, const char *index_path,
+		       int is_main_index)
+{
+	unsigned int i;
+
+	/* TODO: audit for interaction with sparse-index. */
+	ensure_full_index(istate);
+	for (i = 0; i < istate->cache_nr; i++) {
+		unsigned int mode;
+		struct blob *blob;
+		struct object *obj;
+
+		mode = istate->cache[i]->ce_mode;
+		if (S_ISGITLINK(mode))
+			continue;
+		blob = lookup_blob(the_repository,
+				   &istate->cache[i]->oid);
+		if (!blob)
+			continue;
+		obj = &blob->object;
+		obj->flags |= USED;
+		fsck_put_object_name(&fsck_walk_options, &obj->oid,
+				     "%s:%s",
+				     is_main_index ? "" : index_path,
+				     istate->cache[i]->name);
+		mark_object_reachable(obj);
+	}
+	if (istate->cache_tree)
+		fsck_cache_tree(istate->cache_tree, index_path);
+	fsck_resolve_undo(istate, index_path);
+}
+
 static void mark_object_for_connectivity(const struct object_id *oid)
 {
 	struct object *obj = lookup_unknown_object(the_repository, oid);
@@ -803,17 +839,17 @@
 }
 
 static int mark_loose_for_connectivity(const struct object_id *oid,
-				       const char *path,
-				       void *data)
+				       const char *path UNUSED,
+				       void *data UNUSED)
 {
 	mark_object_for_connectivity(oid);
 	return 0;
 }
 
 static int mark_packed_for_connectivity(const struct object_id *oid,
-					struct packed_git *pack,
-					uint32_t pos,
-					void *data)
+					struct packed_git *pack UNUSED,
+					uint32_t pos UNUSED,
+					void *data UNUSED)
 {
 	mark_object_for_connectivity(oid);
 	return 0;
@@ -956,32 +992,30 @@
 	}
 
 	if (keep_cache_objects) {
+		struct worktree **worktrees, **p;
+
 		verify_index_checksum = 1;
 		verify_ce_order = 1;
-		repo_read_index(the_repository);
-		/* TODO: audit for interaction with sparse-index. */
-		ensure_full_index(&the_index);
-		for (i = 0; i < the_index.cache_nr; i++) {
-			unsigned int mode;
-			struct blob *blob;
-			struct object *obj;
 
-			mode = the_index.cache[i]->ce_mode;
-			if (S_ISGITLINK(mode))
-				continue;
-			blob = lookup_blob(the_repository,
-					   &the_index.cache[i]->oid);
-			if (!blob)
-				continue;
-			obj = &blob->object;
-			obj->flags |= USED;
-			fsck_put_object_name(&fsck_walk_options, &obj->oid,
-					     ":%s", the_index.cache[i]->name);
-			mark_object_reachable(obj);
+		worktrees = get_worktrees();
+		for (p = worktrees; *p; p++) {
+			struct worktree *wt = *p;
+			struct index_state istate =
+				INDEX_STATE_INIT(the_repository);
+			char *path;
+
+			/*
+			 * Make a copy since the buffer is reusable
+			 * and may get overwritten by other calls
+			 * while we're examining the index.
+			 */
+			path = xstrdup(worktree_git_path(wt, "index"));
+			read_index_from(&istate, path, get_worktree_git_dir(wt));
+			fsck_index(&istate, path, wt->is_current);
+			discard_index(&istate);
+			free(path);
 		}
-		if (the_index.cache_tree)
-			fsck_cache_tree(the_index.cache_tree);
-		fsck_resolve_undo(&the_index);
+		free_worktrees(worktrees);
 	}
 
 	check_connectivity();
diff --git a/builtin/fsmonitor--daemon.c b/builtin/fsmonitor--daemon.c
index 0feef8c..cae804a 100644
--- a/builtin/fsmonitor--daemon.c
+++ b/builtin/fsmonitor--daemon.c
@@ -1,4 +1,5 @@
 #include "builtin.h"
+#include "alloc.h"
 #include "config.h"
 #include "parse-options.h"
 #include "fsmonitor.h"
diff --git a/builtin/gc.c b/builtin/gc.c
index 02455fd..c58fe8c 100644
--- a/builtin/gc.c
+++ b/builtin/gc.c
@@ -11,6 +11,7 @@
  */
 
 #include "builtin.h"
+#include "hex.h"
 #include "repository.h"
 #include "config.h"
 #include "tempfile.h"
@@ -976,9 +977,9 @@
 
 static int loose_object_auto_limit = 100;
 
-static int loose_object_count(const struct object_id *oid,
-			       const char *path,
-			       void *data)
+static int loose_object_count(const struct object_id *oid UNUSED,
+			      const char *path UNUSED,
+			      void *data)
 {
 	int *count = (int*)data;
 	if (++(*count) >= loose_object_auto_limit)
@@ -1003,15 +1004,15 @@
 					     NULL, NULL, &count);
 }
 
-static int bail_on_loose(const struct object_id *oid,
-			 const char *path,
-			 void *data)
+static int bail_on_loose(const struct object_id *oid UNUSED,
+			 const char *path UNUSED,
+			 void *data UNUSED)
 {
 	return 1;
 }
 
 static int write_loose_object_to_stdin(const struct object_id *oid,
-				       const char *path,
+				       const char *path UNUSED,
 				       void *data)
 {
 	struct write_loose_object_data *d = (struct write_loose_object_data *)data;
diff --git a/builtin/grep.c b/builtin/grep.c
index f7821c5..c590fcb 100644
--- a/builtin/grep.c
+++ b/builtin/grep.c
@@ -4,6 +4,8 @@
  * Copyright (c) 2006 Junio C Hamano
  */
 #include "cache.h"
+#include "alloc.h"
+#include "hex.h"
 #include "repository.h"
 #include "config.h"
 #include "blob.h"
diff --git a/builtin/hash-object.c b/builtin/hash-object.c
index 44db83f..1848768 100644
--- a/builtin/hash-object.c
+++ b/builtin/hash-object.c
@@ -6,6 +6,7 @@
  */
 #include "builtin.h"
 #include "config.h"
+#include "hex.h"
 #include "object-store.h"
 #include "blob.h"
 #include "quote.h"
diff --git a/builtin/index-pack.c b/builtin/index-pack.c
index 6648f2d..b451755 100644
--- a/builtin/index-pack.c
+++ b/builtin/index-pack.c
@@ -1,6 +1,8 @@
 #include "builtin.h"
+#include "alloc.h"
 #include "config.h"
 #include "delta.h"
+#include "hex.h"
 #include "pack.h"
 #include "csum-file.h"
 #include "blob.h"
@@ -14,6 +16,7 @@
 #include "thread-utils.h"
 #include "packfile.h"
 #include "object-store.h"
+#include "replace-object.h"
 #include "promisor-remote.h"
 
 static const char index_pack_usage[] =
diff --git a/builtin/log.c b/builtin/log.c
index a70fba1..4693385 100644
--- a/builtin/log.c
+++ b/builtin/log.c
@@ -4,8 +4,10 @@
  * (C) Copyright 2006 Linus Torvalds
  *		 2006 Junio Hamano
  */
-#include "cache.h"
+#include "git-compat-util.h"
+#include "alloc.h"
 #include "config.h"
+#include "hex.h"
 #include "refs.h"
 #include "object-store.h"
 #include "color.h"
@@ -56,6 +58,7 @@
 static const char *fmt_patch_subject_prefix = "PATCH";
 static int fmt_patch_name_max = FORMAT_PATCH_NAME_MAX_DEFAULT;
 static const char *fmt_pretty;
+static int format_no_prefix;
 
 static const char * const builtin_log_usage[] = {
 	N_("git log [<options>] [<revision-range>] [[--] <path>...]"),
@@ -436,7 +439,7 @@
 	setitimer(ITIMER_REAL, &early_output_timer, NULL);
 }
 
-static void early_output(int signal)
+static void early_output(int signal UNUSED)
 {
 	show_early_output = log_show_early;
 }
@@ -601,8 +604,6 @@
 		return 0;
 	}
 
-	if (git_gpg_config(var, value, cb) < 0)
-		return -1;
 	return git_diff_ui_config(var, value, cb);
 }
 
@@ -1084,6 +1085,19 @@
 		stdout_mboxrd = git_config_bool(var, value);
 		return 0;
 	}
+	if (!strcmp(var, "format.noprefix")) {
+		format_no_prefix = 1;
+		return 0;
+	}
+
+	/*
+	 * ignore some porcelain config which would otherwise be parsed by
+	 * git_diff_ui_config(), via git_log_config(); we can't just avoid
+	 * diff_ui_config completely, because we do care about some ui options
+	 * like color.
+	 */
+	if (!strcmp(var, "diff.noprefix"))
+		return 0;
 
 	return git_log_config(var, value, cb);
 }
@@ -1993,6 +2007,9 @@
 	s_r_opt.def = "HEAD";
 	s_r_opt.revarg_opt = REVARG_COMMITTISH;
 
+	if (format_no_prefix)
+		diff_set_noprefix(&rev.diffopt);
+
 	if (default_attach) {
 		rev.mime_boundary = default_attach;
 		rev.no_inline = 1;
@@ -2097,6 +2114,7 @@
 
 	/* Always generate a patch */
 	rev.diffopt.output_format |= DIFF_FORMAT_PATCH;
+	rev.always_show_header = 1;
 
 	rev.zero_commit = zero_commit;
 	rev.patch_name_max = fmt_patch_name_max;
diff --git a/builtin/ls-files.c b/builtin/ls-files.c
index a03b559..26e309f 100644
--- a/builtin/ls-files.c
+++ b/builtin/ls-files.c
@@ -89,12 +89,15 @@
 
 static void write_name_to_buf(struct strbuf *sb, const char *name)
 {
-	const char *rel = relative_path(name, prefix_len ? prefix : NULL, sb);
+	struct strbuf buf = STRBUF_INIT;
+	const char *rel = relative_path(name, prefix_len ? prefix : NULL, &buf);
 
 	if (line_terminator)
 		quote_c_style(rel, sb, NULL, 0);
 	else
 		strbuf_addstr(sb, rel);
+
+	strbuf_release(&buf);
 }
 
 static const char *get_tag(const struct cache_entry *ce, const char *tag)
diff --git a/builtin/ls-remote.c b/builtin/ls-remote.c
index 6516177..2dfbd8e 100644
--- a/builtin/ls-remote.c
+++ b/builtin/ls-remote.c
@@ -1,5 +1,6 @@
 #include "builtin.h"
 #include "cache.h"
+#include "hex.h"
 #include "transport.h"
 #include "ref-filter.h"
 #include "remote.h"
diff --git a/builtin/ls-tree.c b/builtin/ls-tree.c
index 8cc8c99..64d8e54 100644
--- a/builtin/ls-tree.c
+++ b/builtin/ls-tree.c
@@ -5,6 +5,7 @@
  */
 #include "cache.h"
 #include "config.h"
+#include "hex.h"
 #include "object-store.h"
 #include "blob.h"
 #include "tree.h"
diff --git a/builtin/merge-base.c b/builtin/merge-base.c
index 6f3941f..be8f3b2 100644
--- a/builtin/merge-base.c
+++ b/builtin/merge-base.c
@@ -2,6 +2,7 @@
 #include "cache.h"
 #include "config.h"
 #include "commit.h"
+#include "hex.h"
 #include "refs.h"
 #include "diff.h"
 #include "revision.h"
diff --git a/builtin/merge-index.c b/builtin/merge-index.c
index 452f833..c875f5d 100644
--- a/builtin/merge-index.c
+++ b/builtin/merge-index.c
@@ -1,5 +1,6 @@
 #define USE_THE_INDEX_VARIABLE
 #include "builtin.h"
+#include "hex.h"
 #include "run-command.h"
 
 static const char *pgm;
diff --git a/builtin/merge-tree.c b/builtin/merge-tree.c
index 828dc81..e782518 100644
--- a/builtin/merge-tree.c
+++ b/builtin/merge-tree.c
@@ -3,6 +3,7 @@
 #include "tree-walk.h"
 #include "xdiff-interface.h"
 #include "help.h"
+#include "hex.h"
 #include "commit.h"
 #include "commit-reach.h"
 #include "merge-ort.h"
diff --git a/builtin/merge.c b/builtin/merge.c
index 0a3c10a..19c31d4 100644
--- a/builtin/merge.c
+++ b/builtin/merge.c
@@ -8,7 +8,9 @@
 
 #define USE_THE_INDEX_VARIABLE
 #include "cache.h"
+#include "alloc.h"
 #include "config.h"
+#include "hex.h"
 #include "parse-options.h"
 #include "builtin.h"
 #include "lockfile.h"
@@ -661,9 +663,6 @@
 	status = fmt_merge_msg_config(k, v, cb);
 	if (status)
 		return status;
-	status = git_gpg_config(k, v, NULL);
-	if (status)
-		return status;
 	return git_diff_ui_config(k, v, cb);
 }
 
diff --git a/builtin/mktag.c b/builtin/mktag.c
index 5d22909..42c2457 100644
--- a/builtin/mktag.c
+++ b/builtin/mktag.c
@@ -1,4 +1,5 @@
 #include "builtin.h"
+#include "hex.h"
 #include "parse-options.h"
 #include "tag.h"
 #include "replace-object.h"
diff --git a/builtin/mktree.c b/builtin/mktree.c
index 06d8140..848c7b4 100644
--- a/builtin/mktree.c
+++ b/builtin/mktree.c
@@ -4,6 +4,8 @@
  * Copyright (c) Junio C Hamano, 2006, 2009
  */
 #include "builtin.h"
+#include "alloc.h"
+#include "hex.h"
 #include "quote.h"
 #include "tree.h"
 #include "parse-options.h"
diff --git a/builtin/mv.c b/builtin/mv.c
index edd7b93..8129050 100644
--- a/builtin/mv.c
+++ b/builtin/mv.c
@@ -5,6 +5,7 @@
  */
 #define USE_THE_INDEX_VARIABLE
 #include "builtin.h"
+#include "alloc.h"
 #include "config.h"
 #include "pathspec.h"
 #include "lockfile.h"
diff --git a/builtin/name-rev.c b/builtin/name-rev.c
index 97959bf..723ba61 100644
--- a/builtin/name-rev.c
+++ b/builtin/name-rev.c
@@ -1,5 +1,6 @@
 #include "builtin.h"
-#include "cache.h"
+#include "alloc.h"
+#include "hex.h"
 #include "repository.h"
 #include "config.h"
 #include "commit.h"
diff --git a/builtin/notes.c b/builtin/notes.c
index 80d9dfd..75ce7f3 100644
--- a/builtin/notes.c
+++ b/builtin/notes.c
@@ -10,6 +10,7 @@
 #include "cache.h"
 #include "config.h"
 #include "builtin.h"
+#include "hex.h"
 #include "notes.h"
 #include "object-store.h"
 #include "repository.h"
@@ -113,8 +114,9 @@
 }
 
 static int list_each_note(const struct object_id *object_oid,
-		const struct object_id *note_oid, char *note_path,
-		void *cb_data)
+			  const struct object_id *note_oid,
+			  char *note_path UNUSED,
+			  void *cb_data UNUSED)
 {
 	printf("%s %s\n", oid_to_hex(note_oid), oid_to_hex(object_oid));
 	return 0;
diff --git a/builtin/pack-objects.c b/builtin/pack-objects.c
index 74a167a..545b8bd 100644
--- a/builtin/pack-objects.c
+++ b/builtin/pack-objects.c
@@ -1,5 +1,6 @@
 #include "builtin.h"
-#include "cache.h"
+#include "alloc.h"
+#include "hex.h"
 #include "repository.h"
 #include "config.h"
 #include "attr.h"
@@ -31,6 +32,7 @@
 #include "list.h"
 #include "packfile.h"
 #include "object-store.h"
+#include "replace-object.h"
 #include "dir.h"
 #include "midx.h"
 #include "trace2.h"
@@ -1590,7 +1592,7 @@
 
 static int add_object_entry_from_bitmap(const struct object_id *oid,
 					enum object_type type,
-					int flags, uint32_t name_hash,
+					int flags UNUSED, uint32_t name_hash,
 					struct packed_git *pack, off_t offset)
 {
 	display_progress(progress_state, ++nr_seen);
@@ -3260,13 +3262,14 @@
 	return 0;
 }
 
-static void show_commit_pack_hint(struct commit *commit, void *_data)
+static void show_commit_pack_hint(struct commit *commit UNUSED,
+				  void *data UNUSED)
 {
 	/* nothing to do; commits don't have a namehash */
 }
 
 static void show_object_pack_hint(struct object *object, const char *name,
-				  void *_data)
+				  void *data UNUSED)
 {
 	struct object_entry *oe = packlist_find(&to_pack, &object->oid);
 	if (!oe)
@@ -3464,7 +3467,7 @@
 	return;
 }
 
-static void show_cruft_object(struct object *obj, const char *name, void *data)
+static void show_cruft_object(struct object *obj, const char *name, void *data UNUSED)
 {
 	/*
 	 * if we did not record it earlier, it's at least as old as our
@@ -3484,7 +3487,7 @@
 	show_cruft_object((struct object*)commit, NULL, data);
 }
 
-static int cruft_include_check_obj(struct object *obj, void *data)
+static int cruft_include_check_obj(struct object *obj, void *data UNUSED)
 {
 	return !has_object_kept_pack(&obj->oid, IN_CORE_KEEP_PACKS);
 }
@@ -3663,7 +3666,7 @@
 	}
 }
 
-static void show_commit(struct commit *commit, void *data)
+static void show_commit(struct commit *commit, void *data UNUSED)
 {
 	add_object_entry(&commit->object.oid, OBJ_COMMIT, NULL, 0);
 
@@ -3674,7 +3677,8 @@
 		propagate_island_marks(commit);
 }
 
-static void show_object(struct object *obj, const char *name, void *data)
+static void show_object(struct object *obj, const char *name,
+			void *data UNUSED)
 {
 	add_preferred_base_object(name);
 	add_object_entry(&obj->oid, obj->type, name, 0);
@@ -3761,7 +3765,7 @@
 static int add_object_in_unpacked_pack(const struct object_id *oid,
 				       struct packed_git *pack,
 				       uint32_t pos,
-				       void *_data)
+				       void *data UNUSED)
 {
 	if (cruft) {
 		off_t offset;
@@ -3795,7 +3799,7 @@
 }
 
 static int add_loose_object(const struct object_id *oid, const char *path,
-			    void *data)
+			    void *data UNUSED)
 {
 	enum object_type type = oid_object_info(the_repository, oid, NULL);
 
@@ -3946,13 +3950,13 @@
 }
 
 static void record_recent_object(struct object *obj,
-				 const char *name,
-				 void *data)
+				 const char *name UNUSED,
+				 void *data UNUSED)
 {
 	oid_array_append(&recent_objects, &obj->oid);
 }
 
-static void record_recent_commit(struct commit *commit, void *data)
+static void record_recent_commit(struct commit *commit, void *data UNUSED)
 {
 	oid_array_append(&recent_objects, &commit->object.oid);
 }
diff --git a/builtin/pack-redundant.c b/builtin/pack-redundant.c
index ecd49ca..82115c5 100644
--- a/builtin/pack-redundant.c
+++ b/builtin/pack-redundant.c
@@ -7,6 +7,7 @@
 */
 
 #include "builtin.h"
+#include "hex.h"
 #include "repository.h"
 #include "packfile.h"
 #include "object-store.h"
diff --git a/builtin/patch-id.c b/builtin/patch-id.c
index f840fbf..338b15c 100644
--- a/builtin/patch-id.c
+++ b/builtin/patch-id.c
@@ -2,6 +2,7 @@
 #include "builtin.h"
 #include "config.h"
 #include "diff.h"
+#include "hex.h"
 #include "parse-options.h"
 
 static void flush_current_id(int patchlen, struct object_id *id, struct object_id *result)
diff --git a/builtin/prune.c b/builtin/prune.c
index 2719220..119a253 100644
--- a/builtin/prune.c
+++ b/builtin/prune.c
@@ -1,12 +1,14 @@
 #include "cache.h"
 #include "commit.h"
 #include "diff.h"
+#include "hex.h"
 #include "revision.h"
 #include "builtin.h"
 #include "reachable.h"
 #include "parse-options.h"
 #include "progress.h"
 #include "prune-packed.h"
+#include "replace-object.h"
 #include "object-store.h"
 #include "shallow.h"
 
@@ -98,7 +100,8 @@
 	return 0;
 }
 
-static int prune_cruft(const char *basename, const char *path, void *data)
+static int prune_cruft(const char *basename, const char *path,
+		       void *data UNUSED)
 {
 	if (starts_with(basename, "tmp_obj_"))
 		prune_tmp_file(path);
@@ -107,7 +110,8 @@
 	return 0;
 }
 
-static int prune_subdir(unsigned int nr, const char *path, void *data)
+static int prune_subdir(unsigned int nr UNUSED, const char *path,
+			void *data UNUSED)
 {
 	if (!show_only)
 		rmdir(path);
diff --git a/builtin/pull.c b/builtin/pull.c
index 1ab4de0..56f679d 100644
--- a/builtin/pull.c
+++ b/builtin/pull.c
@@ -9,6 +9,7 @@
 #include "cache.h"
 #include "config.h"
 #include "builtin.h"
+#include "hex.h"
 #include "parse-options.h"
 #include "exec-cmd.h"
 #include "run-command.h"
@@ -359,8 +360,6 @@
  */
 static int git_pull_config(const char *var, const char *value, void *cb)
 {
-	int status;
-
 	if (!strcmp(var, "rebase.autostash")) {
 		config_autostash = git_config_bool(var, value);
 		return 0;
@@ -372,10 +371,6 @@
 		check_trust_level = 0;
 	}
 
-	status = git_gpg_config(var, value, cb);
-	if (status)
-		return status;
-
 	return git_default_config(var, value, cb);
 }
 
diff --git a/builtin/push.c b/builtin/push.c
index 8f7d326..12a402a 100644
--- a/builtin/push.c
+++ b/builtin/push.c
@@ -508,11 +508,6 @@
 {
 	const char *slot_name;
 	int *flags = cb;
-	int status;
-
-	status = git_gpg_config(k, v, NULL);
-	if (status)
-		return status;
 
 	if (!strcmp(k, "push.followtags")) {
 		if (git_config_bool(k, v))
diff --git a/builtin/read-tree.c b/builtin/read-tree.c
index 3ce7541..11759c4 100644
--- a/builtin/read-tree.c
+++ b/builtin/read-tree.c
@@ -7,6 +7,7 @@
 #define USE_THE_INDEX_VARIABLE
 #include "cache.h"
 #include "config.h"
+#include "hex.h"
 #include "lockfile.h"
 #include "object.h"
 #include "tree.h"
@@ -87,9 +88,9 @@
 {
 	int i;
 
-	printf("* %d-way merge\n", o->merge_size);
+	printf("* %d-way merge\n", o->internal.merge_size);
 	debug_stage("index", stages[0], o);
-	for (i = 1; i <= o->merge_size; i++) {
+	for (i = 1; i <= o->internal.merge_size; i++) {
 		char buf[24];
 		xsnprintf(buf, sizeof(buf), "ent#%d", i);
 		debug_stage(buf, stages[i], o);
@@ -144,7 +145,7 @@
 		OPT__DRY_RUN(&opts.dry_run, N_("don't update the index or the work tree")),
 		OPT_BOOL(0, "no-sparse-checkout", &opts.skip_sparse_checkout,
 			 N_("skip applying sparse checkout filter")),
-		OPT_BOOL(0, "debug-unpack", &opts.debug_unpack,
+		OPT_BOOL(0, "debug-unpack", &opts.internal.debug_unpack,
 			 N_("debug unpack-trees")),
 		OPT_CALLBACK_F(0, "recurse-submodules", NULL,
 			    "checkout", "control recursive updating of submodules",
@@ -247,7 +248,7 @@
 			opts.head_idx = 1;
 	}
 
-	if (opts.debug_unpack)
+	if (opts.internal.debug_unpack)
 		opts.fn = debug_merge;
 
 	/* If we're going to prime_cache_tree later, skip cache tree update */
@@ -263,7 +264,7 @@
 	if (unpack_trees(nr_trees, t, &opts))
 		return 128;
 
-	if (opts.debug_unpack || opts.dry_run)
+	if (opts.internal.debug_unpack || opts.dry_run)
 		return 0; /* do not write the index out */
 
 	/*
diff --git a/builtin/rebase.c b/builtin/rebase.c
index 6635f10..5b7b908 100644
--- a/builtin/rebase.c
+++ b/builtin/rebase.c
@@ -6,6 +6,7 @@
 
 #define USE_THE_INDEX_VARIABLE
 #include "builtin.h"
+#include "hex.h"
 #include "run-command.h"
 #include "exec-cmd.h"
 #include "strvec.h"
@@ -660,7 +661,7 @@
 	format_patch.git_cmd = 1;
 	strvec_pushl(&format_patch.args, "format-patch", "-k", "--stdout",
 		     "--full-index", "--cherry-pick", "--right-only",
-		     "--src-prefix=a/", "--dst-prefix=b/", "--no-renames",
+		     "--default-prefix", "--no-renames",
 		     "--no-cover-letter", "--pretty=mboxrd", "--topo-order",
 		     "--no-base", NULL);
 	if (opts->git_format_patch_opt.len)
@@ -1513,7 +1514,7 @@
 				die(_("apply options and merge options "
 					  "cannot be used together"));
 			else if (options.autosquash == -1 && options.config_autosquash == 1)
-				die(_("apply options are incompatible with rebase.autosquash.  Consider adding --no-autosquash"));
+				die(_("apply options are incompatible with rebase.autoSquash.  Consider adding --no-autosquash"));
 			else if (options.update_refs == -1 && options.config_update_refs == 1)
 				die(_("apply options are incompatible with rebase.updateRefs.  Consider adding --no-update-refs"));
 			else
diff --git a/builtin/receive-pack.c b/builtin/receive-pack.c
index cd5c7a2..cccdb73 100644
--- a/builtin/receive-pack.c
+++ b/builtin/receive-pack.c
@@ -1,6 +1,7 @@
 #include "builtin.h"
 #include "repository.h"
 #include "config.h"
+#include "hex.h"
 #include "lockfile.h"
 #include "pack.h"
 #include "refs.h"
@@ -136,10 +137,6 @@
 	if (status)
 		return status;
 
-	status = git_gpg_config(var, value, NULL);
-	if (status)
-		return status;
-
 	if (strcmp(var, "receive.denydeletes") == 0) {
 		deny_deletes = git_config_bool(var, value);
 		return 0;
@@ -1463,8 +1460,10 @@
 		find_shared_symref(worktrees, "HEAD", name);
 
 	/* only refs/... are allowed */
-	if (!starts_with(name, "refs/") || check_refname_format(name + 5, 0)) {
-		rp_error("refusing to create funny ref '%s' remotely", name);
+	if (!starts_with(name, "refs/") ||
+	    check_refname_format(name + 5, is_null_oid(new_oid) ?
+				 REFNAME_ALLOW_ONELEVEL : 0)) {
+		rp_error("refusing to update funny ref '%s' remotely", name);
 		ret = "funny refname";
 		goto out;
 	}
@@ -2184,7 +2183,7 @@
 	}
 }
 
-static const char *pack_lockfile;
+static struct tempfile *pack_lockfile;
 
 static void push_header_arg(struct strvec *args, struct pack_header *hdr)
 {
@@ -2251,6 +2250,7 @@
 			return "unpack-objects abnormal exit";
 	} else {
 		char hostname[HOST_NAME_MAX + 1];
+		char *lockfile;
 
 		strvec_pushl(&child.args, "index-pack", "--stdin", NULL);
 		push_header_arg(&child.args, &hdr);
@@ -2280,8 +2280,14 @@
 		status = start_command(&child);
 		if (status)
 			return "index-pack fork failed";
-		pack_lockfile = index_pack_lockfile(child.out, NULL);
+
+		lockfile = index_pack_lockfile(child.out, NULL);
+		if (lockfile) {
+			pack_lockfile = register_tempfile(lockfile);
+			free(lockfile);
+		}
 		close(child.out);
+
 		status = finish_command(&child);
 		if (status)
 			return "index-pack abnormal exit";
@@ -2568,8 +2574,7 @@
 		use_keepalive = KEEPALIVE_ALWAYS;
 		execute_commands(commands, unpack_status, &si,
 				 &push_options);
-		if (pack_lockfile)
-			unlink_or_warn(pack_lockfile);
+		delete_tempfile(&pack_lockfile);
 		sigchain_push(SIGPIPE, SIG_IGN);
 		if (report_status_v2)
 			report_v2(commands, unpack_status);
diff --git a/builtin/repack.c b/builtin/repack.c
index f649379..87f73c8 100644
--- a/builtin/repack.c
+++ b/builtin/repack.c
@@ -1,7 +1,8 @@
 #include "builtin.h"
-#include "cache.h"
+#include "alloc.h"
 #include "config.h"
 #include "dir.h"
+#include "hex.h"
 #include "parse-options.h"
 #include "run-command.h"
 #include "sigchain.h"
@@ -182,8 +183,9 @@
  * Write oid to the given struct child_process's stdin, starting it first if
  * necessary.
  */
-static int write_oid(const struct object_id *oid, struct packed_git *pack,
-		     uint32_t pos, void *data)
+static int write_oid(const struct object_id *oid,
+		     struct packed_git *pack UNUSED,
+		     uint32_t pos UNUSED, void *data)
 {
 	struct child_process *cmd = data;
 
diff --git a/builtin/replace.c b/builtin/replace.c
index a29e911..71d8e94 100644
--- a/builtin/replace.c
+++ b/builtin/replace.c
@@ -11,10 +11,12 @@
 #include "cache.h"
 #include "config.h"
 #include "builtin.h"
+#include "hex.h"
 #include "refs.h"
 #include "parse-options.h"
 #include "run-command.h"
 #include "object-store.h"
+#include "replace-object.h"
 #include "repository.h"
 #include "tag.h"
 
diff --git a/builtin/reset.c b/builtin/reset.c
index 0697fa8..24b04ae 100644
--- a/builtin/reset.c
+++ b/builtin/reset.c
@@ -10,6 +10,7 @@
 #define USE_THE_INDEX_VARIABLE
 #include "builtin.h"
 #include "config.h"
+#include "hex.h"
 #include "lockfile.h"
 #include "tag.h"
 #include "object.h"
@@ -317,7 +318,8 @@
 	int reset_type = NONE, update_ref_status = 0, quiet = 0;
 	int no_refresh = 0;
 	int patch_mode = 0, pathspec_file_nul = 0, unborn;
-	const char *rev, *pathspec_from_file = NULL;
+	const char *rev;
+	char *pathspec_from_file = NULL;
 	struct object_id oid;
 	struct pathspec pathspec;
 	int intent_to_add = 0;
@@ -495,5 +497,6 @@
 
 cleanup:
 	clear_pathspec(&pathspec);
+	free(pathspec_from_file);
 	return update_ref_status;
 }
diff --git a/builtin/rev-list.c b/builtin/rev-list.c
index d42db0b..85e522d 100644
--- a/builtin/rev-list.c
+++ b/builtin/rev-list.c
@@ -2,6 +2,7 @@
 #include "config.h"
 #include "commit.h"
 #include "diff.h"
+#include "hex.h"
 #include "revision.h"
 #include "list-objects.h"
 #include "list-objects-filter.h"
@@ -38,7 +39,7 @@
 "    --tags\n"
 "    --remotes\n"
 "    --stdin\n"
-"    --exclude-hidden=[receive|uploadpack]\n"
+"    --exclude-hidden=[fetch|receive|uploadpack]\n"
 "    --quiet\n"
 "  ordering output:\n"
 "    --topo-order\n"
@@ -257,7 +258,8 @@
 	}
 }
 
-static int finish_object(struct object *obj, const char *name, void *cb_data)
+static int finish_object(struct object *obj, const char *name UNUSED,
+			 void *cb_data)
 {
 	struct rev_list_info *info = cb_data;
 	if (oid_object_info_extended(the_repository, &obj->oid, NULL, 0) < 0) {
@@ -362,11 +364,11 @@
 
 static int show_object_fast(
 	const struct object_id *oid,
-	enum object_type type,
-	int exclude,
-	uint32_t name_hash,
-	struct packed_git *found_pack,
-	off_t found_offset)
+	enum object_type type UNUSED,
+	int exclude UNUSED,
+	uint32_t name_hash UNUSED,
+	struct packed_git *found_pack UNUSED,
+	off_t found_offset UNUSED)
 {
 	fprintf(stdout, "%s\n", oid_to_hex(oid));
 	return 1;
diff --git a/builtin/rev-parse.c b/builtin/rev-parse.c
index e67999e..e1fa9c6 100644
--- a/builtin/rev-parse.c
+++ b/builtin/rev-parse.c
@@ -5,8 +5,10 @@
  */
 #define USE_THE_INDEX_VARIABLE
 #include "cache.h"
+#include "alloc.h"
 #include "config.h"
 #include "commit.h"
+#include "hex.h"
 #include "refs.h"
 #include "quote.h"
 #include "builtin.h"
diff --git a/builtin/revert.c b/builtin/revert.c
index 77d2035..62986a7 100644
--- a/builtin/revert.c
+++ b/builtin/revert.c
@@ -1,4 +1,5 @@
-#include "cache.h"
+#include "git-compat-util.h"
+#include "alloc.h"
 #include "config.h"
 #include "builtin.h"
 #include "parse-options.h"
diff --git a/builtin/rm.c b/builtin/rm.c
index 8844f90..dc198f7 100644
--- a/builtin/rm.c
+++ b/builtin/rm.c
@@ -5,6 +5,7 @@
  */
 #define USE_THE_INDEX_VARIABLE
 #include "builtin.h"
+#include "alloc.h"
 #include "advice.h"
 #include "config.h"
 #include "lockfile.h"
diff --git a/builtin/send-pack.c b/builtin/send-pack.c
index 4c5d125..91c03df 100644
--- a/builtin/send-pack.c
+++ b/builtin/send-pack.c
@@ -1,6 +1,7 @@
 #include "builtin.h"
 #include "config.h"
 #include "commit.h"
+#include "hex.h"
 #include "refs.h"
 #include "pkt-line.h"
 #include "sideband.h"
@@ -130,8 +131,6 @@
 
 static int send_pack_config(const char *k, const char *v, void *cb)
 {
-	git_gpg_config(k, v, NULL);
-
 	if (!strcmp(k, "push.gpgsign")) {
 		const char *value;
 		if (!git_config_get_value("push.gpgsign", &value)) {
@@ -275,7 +274,7 @@
 		fd[0] = 0;
 		fd[1] = 1;
 	} else {
-		conn = git_connect(fd, dest, receivepack,
+		conn = git_connect(fd, dest, "git-receive-pack", receivepack,
 			args.verbose ? CONNECT_VERBOSE : 0);
 	}
 
diff --git a/builtin/show-branch.c b/builtin/show-branch.c
index 358ac3e..8342b68 100644
--- a/builtin/show-branch.c
+++ b/builtin/show-branch.c
@@ -1,5 +1,6 @@
 #include "cache.h"
 #include "config.h"
+#include "hex.h"
 #include "pretty.h"
 #include "refs.h"
 #include "builtin.h"
diff --git a/builtin/show-index.c b/builtin/show-index.c
index 0e0b9fb..98ec40d 100644
--- a/builtin/show-index.c
+++ b/builtin/show-index.c
@@ -1,5 +1,6 @@
 #include "builtin.h"
 #include "cache.h"
+#include "hex.h"
 #include "pack.h"
 #include "parse-options.h"
 
diff --git a/builtin/show-ref.c b/builtin/show-ref.c
index 3af6a53..1f28d7f 100644
--- a/builtin/show-ref.c
+++ b/builtin/show-ref.c
@@ -1,6 +1,7 @@
 #include "builtin.h"
 #include "cache.h"
 #include "config.h"
+#include "hex.h"
 #include "refs.h"
 #include "object-store.h"
 #include "object.h"
diff --git a/builtin/sparse-checkout.c b/builtin/sparse-checkout.c
index c373815..8d5ae6f 100644
--- a/builtin/sparse-checkout.c
+++ b/builtin/sparse-checkout.c
@@ -217,16 +217,14 @@
 	o.head_idx = -1;
 	o.src_index = r->index;
 	o.dst_index = r->index;
-	index_state_init(&o.result, r);
 	o.skip_sparse_checkout = 0;
-	o.pl = pl;
 
 	setup_work_tree();
 
 	repo_hold_locked_index(r, &lock_file, LOCK_DIE_ON_ERROR);
 
 	setup_unpack_trees_porcelain(&o, "sparse-checkout");
-	result = update_sparsity(&o);
+	result = update_sparsity(&o, pl);
 	clear_unpack_trees_porcelain(&o);
 
 	if (result == UPDATE_SPARSITY_WARNINGS)
diff --git a/builtin/stash.c b/builtin/stash.c
index 3a4f9fd..6a12fed 100644
--- a/builtin/stash.c
+++ b/builtin/stash.c
@@ -1,6 +1,7 @@
 #define USE_THE_INDEX_VARIABLE
 #include "builtin.h"
 #include "config.h"
+#include "hex.h"
 #include "parse-options.h"
 #include "refs.h"
 #include "lockfile.h"
diff --git a/builtin/submodule--helper.c b/builtin/submodule--helper.c
index 4c173d8..d05d1a8 100644
--- a/builtin/submodule--helper.c
+++ b/builtin/submodule--helper.c
@@ -1,5 +1,7 @@
 #define USE_THE_INDEX_VARIABLE
 #include "builtin.h"
+#include "alloc.h"
+#include "hex.h"
 #include "repository.h"
 #include "cache.h"
 #include "config.h"
@@ -2132,9 +2134,9 @@
 	return 0;
 }
 
-static int update_clone_start_failure(struct strbuf *err,
+static int update_clone_start_failure(struct strbuf *err UNUSED,
 				      void *suc_cb,
-				      void *idx_task_cb)
+				      void *idx_task_cb UNUSED)
 {
 	struct submodule_update_clone *suc = suc_cb;
 
diff --git a/builtin/tag.c b/builtin/tag.c
index d428c45..adcaa54 100644
--- a/builtin/tag.c
+++ b/builtin/tag.c
@@ -9,6 +9,7 @@
 #include "cache.h"
 #include "config.h"
 #include "builtin.h"
+#include "hex.h"
 #include "refs.h"
 #include "object-store.h"
 #include "tag.h"
@@ -180,8 +181,6 @@
 
 static int git_tag_config(const char *var, const char *value, void *cb)
 {
-	int status;
-
 	if (!strcmp(var, "tag.gpgsign")) {
 		config_sign_tag = git_config_bool(var, value);
 		return 0;
@@ -194,9 +193,6 @@
 		return 0;
 	}
 
-	status = git_gpg_config(var, value, cb);
-	if (status)
-		return status;
 	if (!strcmp(var, "tag.forcesignannotated")) {
 		force_sign_annotate = git_config_bool(var, value);
 		return 0;
@@ -433,7 +429,8 @@
 	int create_reflog = 0;
 	int annotate = 0, force = 0;
 	int cmdmode = 0, create_tag_object = 0;
-	const char *msgfile = NULL, *keyid = NULL;
+	char *msgfile = NULL;
+	const char *keyid = NULL;
 	struct msg_arg msg = { .buf = STRBUF_INIT };
 	struct ref_transaction *transaction;
 	struct strbuf err = STRBUF_INIT;
@@ -643,5 +640,6 @@
 	strbuf_release(&reflog_msg);
 	strbuf_release(&msg.buf);
 	strbuf_release(&err);
+	free(msgfile);
 	return ret;
 }
diff --git a/builtin/unpack-file.c b/builtin/unpack-file.c
index 88de32b..e9b105a 100644
--- a/builtin/unpack-file.c
+++ b/builtin/unpack-file.c
@@ -1,5 +1,6 @@
 #include "builtin.h"
 #include "config.h"
+#include "hex.h"
 #include "object-store.h"
 
 static char *create_temp_file(struct object_id *oid)
diff --git a/builtin/unpack-objects.c b/builtin/unpack-objects.c
index 43789b8..1908dcf 100644
--- a/builtin/unpack-objects.c
+++ b/builtin/unpack-objects.c
@@ -2,12 +2,14 @@
 #include "cache.h"
 #include "bulk-checkin.h"
 #include "config.h"
+#include "hex.h"
 #include "object-store.h"
 #include "object.h"
 #include "delta.h"
 #include "pack.h"
 #include "blob.h"
 #include "commit.h"
+#include "replace-object.h"
 #include "tag.h"
 #include "tree.h"
 #include "tree-walk.h"
diff --git a/builtin/update-index.c b/builtin/update-index.c
index bf38885..11dc135 100644
--- a/builtin/update-index.c
+++ b/builtin/update-index.c
@@ -7,6 +7,7 @@
 #include "cache.h"
 #include "bulk-checkin.h"
 #include "config.h"
+#include "hex.h"
 #include "lockfile.h"
 #include "quote.h"
 #include "cache-tree.h"
diff --git a/builtin/upload-pack.c b/builtin/upload-pack.c
index 25b69da..7a3c687 100644
--- a/builtin/upload-pack.c
+++ b/builtin/upload-pack.c
@@ -4,6 +4,7 @@
 #include "pkt-line.h"
 #include "parse-options.h"
 #include "protocol.h"
+#include "replace-object.h"
 #include "upload-pack.h"
 #include "serve.h"
 
diff --git a/builtin/var.c b/builtin/var.c
index a80c1df..d9943be 100644
--- a/builtin/var.c
+++ b/builtin/var.c
@@ -5,6 +5,7 @@
  */
 #include "builtin.h"
 #include "config.h"
+#include "ident.h"
 #include "refs.h"
 
 static const char var_usage[] = "git var (-l | <variable>)";
diff --git a/builtin/verify-commit.c b/builtin/verify-commit.c
index 3ebad32..7aedf10 100644
--- a/builtin/verify-commit.c
+++ b/builtin/verify-commit.c
@@ -52,14 +52,6 @@
 	return run_gpg_verify((struct commit *)obj, flags);
 }
 
-static int git_verify_commit_config(const char *var, const char *value, void *cb)
-{
-	int status = git_gpg_config(var, value, cb);
-	if (status)
-		return status;
-	return git_default_config(var, value, cb);
-}
-
 int cmd_verify_commit(int argc, const char **argv, const char *prefix)
 {
 	int i = 1, verbose = 0, had_error = 0;
@@ -70,7 +62,7 @@
 		OPT_END()
 	};
 
-	git_config(git_verify_commit_config, NULL);
+	git_config(git_default_config, NULL);
 
 	argc = parse_options(argc, argv, prefix, verify_commit_options,
 			     verify_commit_usage, PARSE_OPT_KEEP_ARGV0);
diff --git a/builtin/verify-tag.c b/builtin/verify-tag.c
index 2175669..5c00b0b 100644
--- a/builtin/verify-tag.c
+++ b/builtin/verify-tag.c
@@ -19,14 +19,6 @@
 		NULL
 };
 
-static int git_verify_tag_config(const char *var, const char *value, void *cb)
-{
-	int status = git_gpg_config(var, value, cb);
-	if (status)
-		return status;
-	return git_default_config(var, value, cb);
-}
-
 int cmd_verify_tag(int argc, const char **argv, const char *prefix)
 {
 	int i = 1, verbose = 0, had_error = 0;
@@ -39,7 +31,7 @@
 		OPT_END()
 	};
 
-	git_config(git_verify_tag_config, NULL);
+	git_config(git_default_config, NULL);
 
 	argc = parse_options(argc, argv, prefix, verify_tag_options,
 			     verify_tag_usage, PARSE_OPT_KEEP_ARGV0);
diff --git a/builtin/worktree.c b/builtin/worktree.c
index 254283a..80d05e2 100644
--- a/builtin/worktree.c
+++ b/builtin/worktree.c
@@ -3,6 +3,7 @@
 #include "config.h"
 #include "builtin.h"
 #include "dir.h"
+#include "hex.h"
 #include "parse-options.h"
 #include "strvec.h"
 #include "branch.h"
diff --git a/builtin/write-tree.c b/builtin/write-tree.c
index 0780103..7ad0d05 100644
--- a/builtin/write-tree.c
+++ b/builtin/write-tree.c
@@ -7,6 +7,7 @@
 #include "builtin.h"
 #include "cache.h"
 #include "config.h"
+#include "hex.h"
 #include "tree.h"
 #include "cache-tree.h"
 #include "parse-options.h"
diff --git a/bulk-checkin.c b/bulk-checkin.c
index 855b68e..d64cd5c 100644
--- a/bulk-checkin.c
+++ b/bulk-checkin.c
@@ -1,8 +1,10 @@
 /*
  * Copyright (c) 2011, Google Inc.
  */
-#include "cache.h"
+#include "git-compat-util.h"
+#include "alloc.h"
 #include "bulk-checkin.h"
+#include "hex.h"
 #include "lockfile.h"
 #include "repository.h"
 #include "csum-file.h"
diff --git a/bundle-uri.c b/bundle-uri.c
index 8a3c39c..177c181 100644
--- a/bundle-uri.c
+++ b/bundle-uri.c
@@ -884,7 +884,7 @@
 	 * Read all "bundle.*" config lines to the client as key=value
 	 * packet lines.
 	 */
-	git_config(config_to_packet_line, &writer);
+	repo_config(r, config_to_packet_line, &writer);
 
 	packet_writer_flush(&writer);
 
diff --git a/bundle.c b/bundle.c
index 6ab6cd7..99d7de9 100644
--- a/bundle.c
+++ b/bundle.c
@@ -1,6 +1,7 @@
 #include "cache.h"
 #include "lockfile.h"
 #include "bundle.h"
+#include "hex.h"
 #include "object-store.h"
 #include "repository.h"
 #include "object.h"
diff --git a/cache-tree.c b/cache-tree.c
index 88c2c04..9d46ece 100644
--- a/cache-tree.c
+++ b/cache-tree.c
@@ -1,4 +1,6 @@
-#include "cache.h"
+#include "git-compat-util.h"
+#include "alloc.h"
+#include "hex.h"
 #include "lockfile.h"
 #include "tree.h"
 #include "tree-walk.h"
diff --git a/cache-tree.h b/cache-tree.h
index bd97caa..faae88b 100644
--- a/cache-tree.h
+++ b/cache-tree.h
@@ -1,7 +1,6 @@
 #ifndef CACHE_TREE_H
 #define CACHE_TREE_H
 
-#include "cache.h"
 #include "tree.h"
 #include "tree-walk.h"
 
diff --git a/cache.h b/cache.h
index 1278990..5a736a2 100644
--- a/cache.h
+++ b/cache.h
@@ -14,8 +14,11 @@
 #include "pack-revindex.h"
 #include "hash.h"
 #include "path.h"
+#include "pathspec.h"
+#include "object.h"
 #include "oid-array.h"
 #include "repository.h"
+#include "statinfo.h"
 #include "mem-pool.h"
 
 typedef struct git_zstream {
@@ -118,26 +121,6 @@
 #define INDEX_FORMAT_LB 2
 #define INDEX_FORMAT_UB 4
 
-/*
- * The "cache_time" is just the low 32 bits of the
- * time. It doesn't matter if it overflows - we only
- * check it for equality in the 32 bits we save.
- */
-struct cache_time {
-	uint32_t sec;
-	uint32_t nsec;
-};
-
-struct stat_data {
-	struct cache_time sd_ctime;
-	struct cache_time sd_mtime;
-	unsigned int sd_dev;
-	unsigned int sd_ino;
-	unsigned int sd_uid;
-	unsigned int sd_gid;
-	unsigned int sd_size;
-};
-
 struct cache_entry {
 	struct hashmap_entry ent;
 	struct stat_data ce_stat_data;
@@ -293,6 +276,15 @@
 	return S_IFGITLINK;
 }
 
+static inline int ce_path_match(struct index_state *istate,
+				const struct cache_entry *ce,
+				const struct pathspec *pathspec,
+				char *seen)
+{
+	return match_pathspec(istate, pathspec, ce->name, ce_namelen(ce), 0, seen,
+			      S_ISDIR(ce->ce_mode) || S_ISGITLINK(ce->ce_mode));
+}
+
 #define cache_entry_size(len) (offsetof(struct cache_entry,name) + (len) + 1)
 
 #define SOMETHING_CHANGED	(1 << 0) /* unclassified changes go here */
@@ -453,26 +445,6 @@
 extern struct index_state the_index;
 #endif
 
-#define TYPE_BITS 3
-
-/*
- * Values in this enum (except those outside the 3 bit range) are part
- * of pack file format. See gitformat-pack(5) for more information.
- */
-enum object_type {
-	OBJ_BAD = -1,
-	OBJ_NONE = 0,
-	OBJ_COMMIT = 1,
-	OBJ_TREE = 2,
-	OBJ_BLOB = 3,
-	OBJ_TAG = 4,
-	/* 5 for future expansion */
-	OBJ_OFS_DELTA = 6,
-	OBJ_REF_DELTA = 7,
-	OBJ_ANY,
-	OBJ_MAX
-};
-
 static inline enum object_type object_type(unsigned int mode)
 {
 	return S_ISDIR(mode) ? OBJ_TREE :
@@ -638,6 +610,9 @@
  */
 char *prefix_filename(const char *prefix, const char *path);
 
+/* Likewise, but path=="-" always yields "-" */
+char *prefix_filename_except_for_dash(const char *prefix, const char *path);
+
 int check_filename(const char *prefix, const char *name);
 void verify_filename(const char *prefix,
 		     const char *name,
@@ -656,81 +631,6 @@
 void sanitize_stdfds(void);
 int daemonize(void);
 
-#define alloc_nr(x) (((x)+16)*3/2)
-
-/**
- * Dynamically growing an array using realloc() is error prone and boring.
- *
- * Define your array with:
- *
- * - a pointer (`item`) that points at the array, initialized to `NULL`
- *   (although please name the variable based on its contents, not on its
- *   type);
- *
- * - an integer variable (`alloc`) that keeps track of how big the current
- *   allocation is, initialized to `0`;
- *
- * - another integer variable (`nr`) to keep track of how many elements the
- *   array currently has, initialized to `0`.
- *
- * Then before adding `n`th element to the item, call `ALLOC_GROW(item, n,
- * alloc)`.  This ensures that the array can hold at least `n` elements by
- * calling `realloc(3)` and adjusting `alloc` variable.
- *
- * ------------
- * sometype *item;
- * size_t nr;
- * size_t alloc
- *
- * for (i = 0; i < nr; i++)
- * 	if (we like item[i] already)
- * 		return;
- *
- * // we did not like any existing one, so add one
- * ALLOC_GROW(item, nr + 1, alloc);
- * item[nr++] = value you like;
- * ------------
- *
- * You are responsible for updating the `nr` variable.
- *
- * If you need to specify the number of elements to allocate explicitly
- * then use the macro `REALLOC_ARRAY(item, alloc)` instead of `ALLOC_GROW`.
- *
- * Consider using ALLOC_GROW_BY instead of ALLOC_GROW as it has some
- * added niceties.
- *
- * DO NOT USE any expression with side-effect for 'x', 'nr', or 'alloc'.
- */
-#define ALLOC_GROW(x, nr, alloc) \
-	do { \
-		if ((nr) > alloc) { \
-			if (alloc_nr(alloc) < (nr)) \
-				alloc = (nr); \
-			else \
-				alloc = alloc_nr(alloc); \
-			REALLOC_ARRAY(x, alloc); \
-		} \
-	} while (0)
-
-/*
- * Similar to ALLOC_GROW but handles updating of the nr value and
- * zeroing the bytes of the newly-grown array elements.
- *
- * DO NOT USE any expression with side-effect for any of the
- * arguments.
- */
-#define ALLOC_GROW_BY(x, nr, increase, alloc) \
-	do { \
-		if (increase) { \
-			size_t new_nr = nr + (increase); \
-			if (new_nr < nr) \
-				BUG("negative growth in ALLOC_GROW_BY"); \
-			ALLOC_GROW(x, new_nr, alloc); \
-			memset((x) + nr, 0, sizeof(*(x)) * (increase)); \
-			nr = new_nr; \
-		} \
-	} while (0)
-
 /* Initialize and use the cache information */
 struct lock_file;
 void preload_index(struct index_state *index,
@@ -990,14 +890,6 @@
 void reset_shared_repository(void);
 
 /*
- * Do replace refs need to be checked this run?  This variable is
- * initialized to true unless --no-replace-object is used or
- * $GIT_NO_REPLACE_OBJECTS is set, but is set to false by some
- * commands that do not want replace references to be active.
- */
-extern int read_replace_refs;
-
-/*
  * These values are used to help identify parts of a repository to fsync.
  * FSYNC_COMPONENT_NONE identifies data that will not be a persistent part of the
  * repository and so shouldn't be fsynced.
@@ -1400,22 +1292,6 @@
 /* Helper to check and "touch" a file */
 int check_and_freshen_file(const char *fn, int freshen);
 
-extern const signed char hexval_table[256];
-static inline unsigned int hexval(unsigned char c)
-{
-	return hexval_table[c];
-}
-
-/*
- * Convert two consecutive hexadecimal digits into a char.  Return a
- * negative value on error.  Don't run over the end of short strings.
- */
-static inline int hex2chr(const char *s)
-{
-	unsigned int val = hexval(s[0]);
-	return (val & ~0xf) ? val : (val << 4) | hexval(s[1]);
-}
-
 /* Convert to/from hex/sha1 representation */
 #define MINIMUM_ABBREV minimum_abbrev
 #define DEFAULT_ABBREV default_abbrev
@@ -1438,40 +1314,6 @@
 	char *path;
 };
 
-#define GET_OID_QUIETLY           01
-#define GET_OID_COMMIT            02
-#define GET_OID_COMMITTISH        04
-#define GET_OID_TREE             010
-#define GET_OID_TREEISH          020
-#define GET_OID_BLOB             040
-#define GET_OID_FOLLOW_SYMLINKS 0100
-#define GET_OID_RECORD_PATH     0200
-#define GET_OID_ONLY_TO_DIE    04000
-#define GET_OID_REQUIRE_PATH  010000
-
-#define GET_OID_DISAMBIGUATORS \
-	(GET_OID_COMMIT | GET_OID_COMMITTISH | \
-	GET_OID_TREE | GET_OID_TREEISH | \
-	GET_OID_BLOB)
-
-enum get_oid_result {
-	FOUND = 0,
-	MISSING_OBJECT = -1, /* The requested object is missing */
-	SHORT_NAME_AMBIGUOUS = -2,
-	/* The following only apply when symlinks are followed */
-	DANGLING_SYMLINK = -4, /*
-				* The initial symlink is there, but
-				* (transitively) points to a missing
-				* in-tree file
-				*/
-	SYMLINK_LOOP = -5,
-	NOT_DIR = -6, /*
-		       * Somewhere along the symlink chain, a path is
-		       * requested which contains a file as a
-		       * non-final element.
-		       */
-};
-
 int repo_get_oid(struct repository *r, const char *str, struct object_id *oid);
 __attribute__((format (printf, 2, 3)))
 int get_oidf(struct object_id *oid, const char *fmt, ...);
@@ -1503,68 +1345,6 @@
 int set_disambiguate_hint_config(const char *var, const char *value);
 
 /*
- * Try to read a SHA1 in hexadecimal format from the 40 characters
- * starting at hex.  Write the 20-byte result to sha1 in binary form.
- * Return 0 on success.  Reading stops if a NUL is encountered in the
- * input, so it is safe to pass this function an arbitrary
- * null-terminated string.
- */
-int get_sha1_hex(const char *hex, unsigned char *sha1);
-int get_oid_hex(const char *hex, struct object_id *sha1);
-
-/* Like get_oid_hex, but for an arbitrary hash algorithm. */
-int get_oid_hex_algop(const char *hex, struct object_id *oid, const struct git_hash_algo *algop);
-
-/*
- * Read `len` pairs of hexadecimal digits from `hex` and write the
- * values to `binary` as `len` bytes. Return 0 on success, or -1 if
- * the input does not consist of hex digits).
- */
-int hex_to_bytes(unsigned char *binary, const char *hex, size_t len);
-
-/*
- * Convert a binary hash in "unsigned char []" or an object name in
- * "struct object_id *" to its hex equivalent. The `_r` variant is reentrant,
- * and writes the NUL-terminated output to the buffer `out`, which must be at
- * least `GIT_MAX_HEXSZ + 1` bytes, and returns a pointer to out for
- * convenience.
- *
- * The non-`_r` variant returns a static buffer, but uses a ring of 4
- * buffers, making it safe to make multiple calls for a single statement, like:
- *
- *   printf("%s -> %s", hash_to_hex(one), hash_to_hex(two));
- *   printf("%s -> %s", oid_to_hex(one), oid_to_hex(two));
- */
-char *hash_to_hex_algop_r(char *buffer, const unsigned char *hash, const struct git_hash_algo *);
-char *oid_to_hex_r(char *out, const struct object_id *oid);
-char *hash_to_hex_algop(const unsigned char *hash, const struct git_hash_algo *);	/* static buffer result! */
-char *hash_to_hex(const unsigned char *hash);						/* same static buffer */
-char *oid_to_hex(const struct object_id *oid);						/* same static buffer */
-
-/*
- * Parse a 40-character hexadecimal object ID starting from hex, updating the
- * pointer specified by end when parsing stops.  The resulting object ID is
- * stored in oid.  Returns 0 on success.  Parsing will stop on the first NUL or
- * other invalid character.  end is only updated on success; otherwise, it is
- * unmodified.
- */
-int parse_oid_hex(const char *hex, struct object_id *oid, const char **end);
-
-/* Like parse_oid_hex, but for an arbitrary hash algorithm. */
-int parse_oid_hex_algop(const char *hex, struct object_id *oid, const char **end,
-			const struct git_hash_algo *algo);
-
-
-/*
- * These functions work like get_oid_hex and parse_oid_hex, but they will parse
- * a hex value for any algorithm. The algorithm is detected based on the length
- * and the algorithm in use is returned. If this is not a hex object ID in any
- * algorithm, returns GIT_HASH_UNKNOWN.
- */
-int get_oid_hex_any(const char *hex, struct object_id *oid);
-int parse_oid_hex_any(const char *hex, struct object_id *oid, const char **end);
-
-/*
  * This reads short-hand syntax that not only evaluates to a commit
  * object name, but also can act as if the end user spelled the name
  * of the branch from the command line.
@@ -1632,65 +1412,10 @@
 #define peel_to_type(name, namelen, obj, type) \
 	repo_peel_to_type(the_repository, name, namelen, obj, type)
 
-#define IDENT_STRICT	       1
-#define IDENT_NO_DATE	       2
-#define IDENT_NO_NAME	       4
-
-enum want_ident {
-	WANT_BLANK_IDENT,
-	WANT_AUTHOR_IDENT,
-	WANT_COMMITTER_IDENT
-};
-
-const char *git_author_info(int);
-const char *git_committer_info(int);
-const char *fmt_ident(const char *name, const char *email,
-		      enum want_ident whose_ident,
-		      const char *date_str, int);
-const char *fmt_name(enum want_ident);
-const char *ident_default_name(void);
-const char *ident_default_email(void);
 const char *git_editor(void);
 const char *git_sequence_editor(void);
 const char *git_pager(int stdout_is_tty);
 int is_terminal_dumb(void);
-int git_ident_config(const char *, const char *, void *);
-/*
- * Prepare an ident to fall back on if the user didn't configure it.
- */
-void prepare_fallback_ident(const char *name, const char *email);
-void reset_ident_date(void);
-
-struct ident_split {
-	const char *name_begin;
-	const char *name_end;
-	const char *mail_begin;
-	const char *mail_end;
-	const char *date_begin;
-	const char *date_end;
-	const char *tz_begin;
-	const char *tz_end;
-};
-/*
- * Signals an success with 0, but time part of the result may be NULL
- * if the input lacks timestamp and zone
- */
-int split_ident_line(struct ident_split *, const char *, int);
-
-/*
- * Given a commit or tag object buffer and the commit or tag headers, replaces
- * the idents in the headers with their canonical versions using the mailmap mechanism.
- */
-void apply_mailmap_to_header(struct strbuf *, const char **, struct string_list *);
-
-/*
- * Compare split idents for equality or strict ordering. Note that we
- * compare only the ident part of the line, ignoring any timestamp.
- *
- * Because there are two fields, we must choose one as the primary key; we
- * currently arbitrarily pick the email.
- */
-int ident_cmp(const struct ident_split *, const struct ident_split *);
 
 struct cache_def {
 	struct strbuf path;
@@ -1757,9 +1482,6 @@
 const char *get_log_output_encoding(void);
 const char *get_commit_output_encoding(void);
 
-int committer_ident_sufficiently_given(void);
-int author_ident_sufficiently_given(void);
-
 extern const char *git_commit_encoding;
 extern const char *git_log_output_encoding;
 extern const char *git_mailmap_file;
diff --git a/cbtree.c b/cbtree.c
index 336e46d..c1cc30a 100644
--- a/cbtree.c
+++ b/cbtree.c
@@ -4,6 +4,7 @@
  * Based on Adam Langley's adaptation of Dan Bernstein's public domain code
  * git clone https://github.com/agl/critbit.git
  */
+#include "git-compat-util.h"
 #include "cbtree.h"
 
 static struct cb_node *cb_node_of(const void *p)
diff --git a/cbtree.h b/cbtree.h
index 0be14fb..43193ab 100644
--- a/cbtree.h
+++ b/cbtree.h
@@ -14,8 +14,6 @@
 #ifndef CBTREE_H
 #define CBTREE_H
 
-#include "git-compat-util.h"
-
 struct cb_node;
 struct cb_node {
 	struct cb_node *child[2];
diff --git a/checkout.h b/checkout.h
index 1152133..1917f3b 100644
--- a/checkout.h
+++ b/checkout.h
@@ -1,7 +1,7 @@
 #ifndef CHECKOUT_H
 #define CHECKOUT_H
 
-#include "cache.h"
+#include "hash.h"
 
 /*
  * Check if the branch name uniquely matches a branch name on a remote
diff --git a/chunk-format.c b/chunk-format.c
index 0275b74..f65e9a1 100644
--- a/chunk-format.c
+++ b/chunk-format.c
@@ -1,4 +1,5 @@
-#include "cache.h"
+#include "git-compat-util.h"
+#include "alloc.h"
 #include "chunk-format.h"
 #include "csum-file.h"
 
diff --git a/chunk-format.h b/chunk-format.h
index 7885aa0..025c38f 100644
--- a/chunk-format.h
+++ b/chunk-format.h
@@ -1,7 +1,6 @@
 #ifndef CHUNK_FORMAT_H
 #define CHUNK_FORMAT_H
 
-#include "git-compat-util.h"
 #include "hash.h"
 
 struct hashfile;
diff --git a/color.c b/color.c
index f05d8a8..6b577ce 100644
--- a/color.c
+++ b/color.c
@@ -1,6 +1,7 @@
 #include "cache.h"
 #include "config.h"
 #include "color.h"
+#include "hex.h"
 
 static int git_use_color_default = GIT_COLOR_AUTO;
 int color_stdout_is_tty = -1;
diff --git a/combine-diff.c b/combine-diff.c
index 1a39b5d..91051dc 100644
--- a/combine-diff.c
+++ b/combine-diff.c
@@ -4,6 +4,7 @@
 #include "blob.h"
 #include "diff.h"
 #include "diffcore.h"
+#include "hex.h"
 #include "quote.h"
 #include "xdiff-interface.h"
 #include "xdiff/xmacros.h"
diff --git a/commit-graph.c b/commit-graph.c
index c11b59f..5e6098f 100644
--- a/commit-graph.c
+++ b/commit-graph.c
@@ -1,5 +1,6 @@
 #include "git-compat-util.h"
 #include "config.h"
+#include "hex.h"
 #include "lockfile.h"
 #include "pack.h"
 #include "packfile.h"
diff --git a/commit-graph.h b/commit-graph.h
index 37faee6..bb88bec 100644
--- a/commit-graph.h
+++ b/commit-graph.h
@@ -1,7 +1,6 @@
 #ifndef COMMIT_GRAPH_H
 #define COMMIT_GRAPH_H
 
-#include "git-compat-util.h"
 #include "object-store.h"
 #include "oidset.h"
 
diff --git a/commit-reach.c b/commit-reach.c
index 2e33c59..7c0c39f 100644
--- a/commit-reach.c
+++ b/commit-reach.c
@@ -1,7 +1,9 @@
-#include "cache.h"
+#include "git-compat-util.h"
+#include "alloc.h"
 #include "commit.h"
 #include "commit-graph.h"
 #include "decorate.h"
+#include "hex.h"
 #include "prio-queue.h"
 #include "tree.h"
 #include "ref-filter.h"
@@ -807,8 +809,12 @@
 	clear_commit_marks_many(nr_commits, list, RESULT | assign_flag);
 	free(list);
 
-	for (i = 0; i < from->nr; i++)
-		from->objects[i].item->flags &= ~assign_flag;
+	for (i = 0; i < from->nr; i++) {
+		struct object *from_one = from->objects[i].item;
+
+		if (from_one)
+			from_one->flags &= ~assign_flag;
+	}
 
 	return result;
 }
diff --git a/commit-slab-impl.h b/commit-slab-impl.h
index 557738d..4a414ee 100644
--- a/commit-slab-impl.h
+++ b/commit-slab-impl.h
@@ -1,8 +1,6 @@
 #ifndef COMMIT_SLAB_IMPL_H
 #define COMMIT_SLAB_IMPL_H
 
-#include "git-compat-util.h"
-
 #define implement_static_commit_slab(slabname, elemtype) \
 	implement_commit_slab(slabname, elemtype, MAYBE_UNUSED static)
 
diff --git a/commit.c b/commit.c
index e433c33..7b63d3b 100644
--- a/commit.c
+++ b/commit.c
@@ -2,6 +2,7 @@
 #include "tag.h"
 #include "commit.h"
 #include "commit-graph.h"
+#include "hex.h"
 #include "repository.h"
 #include "object-store.h"
 #include "pkt-line.h"
@@ -801,7 +802,8 @@
 	return 0;
 }
 
-int compare_commits_by_gen_then_commit_date(const void *a_, const void *b_, void *unused)
+int compare_commits_by_gen_then_commit_date(const void *a_, const void *b_,
+					    void *unused UNUSED)
 {
 	const struct commit *a = a_, *b = b_;
 	const timestamp_t generation_a = commit_graph_generation(a),
@@ -821,7 +823,8 @@
 	return 0;
 }
 
-int compare_commits_by_commit_date(const void *a_, const void *b_, void *unused)
+int compare_commits_by_commit_date(const void *a_, const void *b_,
+				   void *unused UNUSED)
 {
 	const struct commit *a = a_, *b = b_;
 	/* newer commits with larger date first */
diff --git a/commit.h b/commit.h
index cc2c5da..06657b4 100644
--- a/commit.h
+++ b/commit.h
@@ -205,7 +205,6 @@
 
 struct rev_info; /* in revision.h, it circularly uses enum cmit_fmt */
 
-int has_non_ascii(const char *text);
 const char *logmsg_reencode(const struct commit *commit,
 			    char **commit_encoding,
 			    const char *output_encoding);
diff --git a/compat/fsmonitor/fsm-ipc-darwin.c b/compat/fsmonitor/fsm-ipc-darwin.c
index d67b0ee..eb25123 100644
--- a/compat/fsmonitor/fsm-ipc-darwin.c
+++ b/compat/fsmonitor/fsm-ipc-darwin.c
@@ -1,5 +1,6 @@
 #include "cache.h"
 #include "config.h"
+#include "hex.h"
 #include "strbuf.h"
 #include "fsmonitor.h"
 #include "fsmonitor-ipc.h"
diff --git a/compat/fsmonitor/fsm-ipc-win32.c b/compat/fsmonitor/fsm-ipc-win32.c
index e08c505..c9536df 100644
--- a/compat/fsmonitor/fsm-ipc-win32.c
+++ b/compat/fsmonitor/fsm-ipc-win32.c
@@ -1,3 +1,4 @@
+#include "git-compat-util.h"
 #include "config.h"
 #include "fsmonitor-ipc.h"
 
diff --git a/compat/fsmonitor/fsm-settings-darwin.c b/compat/fsmonitor/fsm-settings-darwin.c
index 6abbc7a..58b623f 100644
--- a/compat/fsmonitor/fsm-settings-darwin.c
+++ b/compat/fsmonitor/fsm-settings-darwin.c
@@ -1,3 +1,4 @@
+#include "git-compat-util.h"
 #include "config.h"
 #include "fsmonitor.h"
 #include "fsmonitor-ipc.h"
diff --git a/compat/mingw.c b/compat/mingw.c
index e433740..3afbde7 100644
--- a/compat/mingw.c
+++ b/compat/mingw.c
@@ -7,6 +7,7 @@
 #include "../strbuf.h"
 #include "../run-command.h"
 #include "../cache.h"
+#include "../alloc.h"
 #include "win32/lazyload.h"
 #include "../config.h"
 #include "dir.h"
diff --git a/config.c b/config.c
index 00090a3..d0aff55 100644
--- a/config.c
+++ b/config.c
@@ -5,11 +5,13 @@
  * Copyright (C) Johannes Schindelin, 2005
  *
  */
-#include "cache.h"
+#include "git-compat-util.h"
+#include "alloc.h"
 #include "date.h"
 #include "branch.h"
 #include "config.h"
 #include "environment.h"
+#include "ident.h"
 #include "repository.h"
 #include "lockfile.h"
 #include "exec-cmd.h"
@@ -21,6 +23,7 @@
 #include "utf8.h"
 #include "dir.h"
 #include "color.h"
+#include "replace-object.h"
 #include "refs.h"
 #include "worktree.h"
 
diff --git a/connect.c b/connect.c
index 63e5964..ed48611 100644
--- a/connect.c
+++ b/connect.c
@@ -1,6 +1,7 @@
 #include "git-compat-util.h"
 #include "cache.h"
 #include "config.h"
+#include "hex.h"
 #include "pkt-line.h"
 #include "quote.h"
 #include "refs.h"
@@ -30,7 +31,8 @@
 		return 0;
 
 	/* REF_NORMAL means that we don't want the magic fake tag refs */
-	if ((flags & REF_NORMAL) && check_refname_format(name, 0))
+	if ((flags & REF_NORMAL) && check_refname_format(name,
+							 REFNAME_ALLOW_ONELEVEL))
 		return 0;
 
 	/* REF_HEADS means that we want regular branch heads */
@@ -1406,6 +1408,7 @@
  * the connection failed).
  */
 struct child_process *git_connect(int fd[2], const char *url,
+				  const char *name,
 				  const char *prog, int flags)
 {
 	char *hostandport, *path;
@@ -1415,10 +1418,11 @@
 
 	/*
 	 * NEEDSWORK: If we are trying to use protocol v2 and we are planning
-	 * to perform a push, then fallback to v0 since the client doesn't know
-	 * how to push yet using v2.
+	 * to perform any operation that doesn't involve upload-pack (i.e., a
+	 * fetch, ls-remote, etc), then fallback to v0 since we don't know how
+	 * to do anything else (like push or remote archive) via v2.
 	 */
-	if (version == protocol_v2 && !strcmp("git-receive-pack", prog))
+	if (version == protocol_v2 && strcmp("git-upload-pack", name))
 		version = protocol_v0;
 
 	/* Without this we cannot rely on waitpid() to tell
diff --git a/connect.h b/connect.h
index b26f7de..f41a0b4 100644
--- a/connect.h
+++ b/connect.h
@@ -7,7 +7,7 @@
 #define CONNECT_DIAG_URL      (1u << 1)
 #define CONNECT_IPV4          (1u << 2)
 #define CONNECT_IPV6          (1u << 3)
-struct child_process *git_connect(int fd[2], const char *url, const char *prog, int flags);
+struct child_process *git_connect(int fd[2], const char *url, const char *name, const char *prog, int flags);
 int finish_connect(struct child_process *conn);
 int git_connection_is_socket(struct child_process *conn);
 int server_supports(const char *feature);
diff --git a/connected.c b/connected.c
index b90fd61..39cb1e1 100644
--- a/connected.c
+++ b/connected.c
@@ -1,4 +1,5 @@
 #include "cache.h"
+#include "hex.h"
 #include "object-store.h"
 #include "run-command.h"
 #include "sigchain.h"
diff --git a/contrib/completion/git-prompt.sh b/contrib/completion/git-prompt.sh
index 57972c2..76ee4ab 100644
--- a/contrib/completion/git-prompt.sh
+++ b/contrib/completion/git-prompt.sh
@@ -100,9 +100,7 @@
 #
 # If you would like a colored hint about the current dirty state, set
 # GIT_PS1_SHOWCOLORHINTS to a nonempty value. The colors are based on
-# the colored output of "git status -sb" and are available only when
-# using __git_ps1 for PROMPT_COMMAND or precmd in Bash,
-# but always available in Zsh.
+# the colored output of "git status -sb".
 #
 # If you would like __git_ps1 to do nothing in the case when the current
 # directory is set up to be ignored by git, then set
@@ -259,12 +257,12 @@
 		local c_lblue='%F{blue}'
 		local c_clear='%f'
 	else
-		# Using \[ and \] around colors is necessary to prevent
+		# Using \001 and \002 around colors is necessary to prevent
 		# issues with command line editing/browsing/completion!
-		local c_red='\[\e[31m\]'
-		local c_green='\[\e[32m\]'
-		local c_lblue='\[\e[1;34m\]'
-		local c_clear='\[\e[0m\]'
+		local c_red=$'\001\e[31m\002'
+		local c_green=$'\001\e[32m\002'
+		local c_lblue=$'\001\e[1;34m\002'
+		local c_clear=$'\001\e[0m\002'
 	fi
 	local bad_color=$c_red
 	local ok_color=$c_green
@@ -574,11 +572,8 @@
 		b="\${__git_ps1_branch_name}"
 	fi
 
-	# NO color option unless in PROMPT_COMMAND mode or it's Zsh
 	if [ -n "${GIT_PS1_SHOWCOLORHINTS-}" ]; then
-		if [ $pcmode = yes ] || [ -n "${ZSH_VERSION-}" ]; then
-			__git_ps1_colorize_gitstring
-		fi
+		__git_ps1_colorize_gitstring
 	fi
 
 	local f="$h$w$i$s$u$p"
diff --git a/contrib/subtree/t/Makefile b/contrib/subtree/t/Makefile
index 4655e09..093399c 100644
--- a/contrib/subtree/t/Makefile
+++ b/contrib/subtree/t/Makefile
@@ -74,9 +74,7 @@
 	$(MAKE) clean
 
 aggregate-results:
-	for f in '$(TEST_RESULTS_DIRECTORY_SQ)'/t*-*.counts; do \
-		echo "$$f"; \
-	done | '$(SHELL_PATH_SQ)' ../../../t/aggregate-results.sh
+	@'$(SHELL_PATH_SQ)' ../../../t/aggregate-results.sh '$(TEST_RESULTS_DIRECTORY_SQ)'
 
 valgrind:
 	$(MAKE) GIT_TEST_OPTS="$(GIT_TEST_OPTS) --valgrind"
diff --git a/convert.c b/convert.c
index a54d169..349c7e4 100644
--- a/convert.c
+++ b/convert.c
@@ -1,5 +1,6 @@
 #include "cache.h"
 #include "config.h"
+#include "hex.h"
 #include "object-store.h"
 #include "attr.h"
 #include "run-command.h"
diff --git a/credential.c b/credential.c
index f320113..ea40a2a 100644
--- a/credential.c
+++ b/credential.c
@@ -23,6 +23,7 @@
 	free(c->username);
 	free(c->password);
 	string_list_clear(&c->helpers, 0);
+	strvec_clear(&c->wwwauth_headers);
 
 	credential_init(c);
 }
@@ -280,6 +281,8 @@
 		credential_write_item(fp, "password_expiry_utc", s, 0);
 		free(s);
 	}
+	for (size_t i = 0; i < c->wwwauth_headers.nr; i++)
+		credential_write_item(fp, "wwwauth[]", c->wwwauth_headers.v[i], 0);
 }
 
 static int run_credential_helper(struct credential *c,
diff --git a/credential.h b/credential.h
index 935b28a..2b5958c 100644
--- a/credential.h
+++ b/credential.h
@@ -2,6 +2,7 @@
 #define CREDENTIAL_H
 
 #include "string-list.h"
+#include "strvec.h"
 
 /**
  * The credentials API provides an abstracted way of gathering username and
@@ -115,6 +116,20 @@
 	 */
 	struct string_list helpers;
 
+	/**
+	 * A `strvec` of WWW-Authenticate header values. Each string
+	 * is the value of a WWW-Authenticate header in an HTTP response,
+	 * in the order they were received in the response.
+	 */
+	struct strvec wwwauth_headers;
+
+	/**
+	 * Internal use only. Keeps track of if we previously matched against a
+	 * WWW-Authenticate header line in order to re-fold future continuation
+	 * lines into one value.
+	 */
+	unsigned header_is_last_match:1;
+
 	unsigned approved:1,
 		 configured:1,
 		 quit:1,
@@ -132,6 +147,7 @@
 #define CREDENTIAL_INIT { \
 	.helpers = STRING_LIST_INIT_DUP, \
 	.password_expiry_utc = TIME_MAX, \
+	.wwwauth_headers = STRVEC_INIT, \
 }
 
 /* Initialize a credential structure, setting all fields to empty. */
diff --git a/daemon.c b/daemon.c
index 0ae7d12..8908e7f 100644
--- a/daemon.c
+++ b/daemon.c
@@ -1,4 +1,5 @@
 #include "cache.h"
+#include "alloc.h"
 #include "config.h"
 #include "pkt-line.h"
 #include "run-command.h"
@@ -928,7 +929,7 @@
 		add_child(&cld, addr, addrlen);
 }
 
-static void child_handler(int signo)
+static void child_handler(int signo UNUSED)
 {
 	/*
 	 * Otherwise empty handler because systemcalls will get interrupted
diff --git a/decorate.c b/decorate.c
index 2036d15..71e79da 100644
--- a/decorate.c
+++ b/decorate.c
@@ -2,7 +2,8 @@
  * decorate.c - decorate a git object with some arbitrary
  * data.
  */
-#include "cache.h"
+#include "git-compat-util.h"
+#include "hashmap.h"
 #include "object.h"
 #include "decorate.h"
 
diff --git a/delta-islands.c b/delta-islands.c
index afdec0a..fe12c93 100644
--- a/delta-islands.c
+++ b/delta-islands.c
@@ -1,8 +1,10 @@
-#include "cache.h"
+#include "git-compat-util.h"
+#include "alloc.h"
 #include "attr.h"
 #include "object.h"
 #include "blob.h"
 #include "commit.h"
+#include "hex.h"
 #include "tag.h"
 #include "tree.h"
 #include "delta.h"
diff --git a/diagnose.c b/diagnose.c
index 8f26569..5b398f0 100644
--- a/diagnose.c
+++ b/diagnose.c
@@ -4,6 +4,7 @@
 #include "archive.h"
 #include "dir.h"
 #include "help.h"
+#include "hex.h"
 #include "strvec.h"
 #include "object-store.h"
 #include "packfile.h"
@@ -43,7 +44,8 @@
 	return error(_("invalid --%s value '%s'"), opt->long_name, arg);
 }
 
-static void dir_file_stats_objects(const char *full_path, size_t full_path_len,
+static void dir_file_stats_objects(const char *full_path,
+				   size_t full_path_len UNUSED,
 				   const char *file_name, void *data)
 {
 	struct strbuf *buf = data;
diff --git a/diff-lib.c b/diff-lib.c
index dec040c..70b3578 100644
--- a/diff-lib.c
+++ b/diff-lib.c
@@ -6,6 +6,7 @@
 #include "commit.h"
 #include "diff.h"
 #include "diffcore.h"
+#include "hex.h"
 #include "revision.h"
 #include "cache-tree.h"
 #include "unpack-trees.h"
diff --git a/diff-merges.c b/diff-merges.c
index 85cbefa..ec97616 100644
--- a/diff-merges.c
+++ b/diff-merges.c
@@ -1,5 +1,7 @@
+#include "git-compat-util.h"
 #include "diff-merges.h"
 
+#include "gettext.h"
 #include "revision.h"
 
 typedef void (*diff_merges_setup_func_t)(struct rev_info *);
diff --git a/diff-no-index.c b/diff-no-index.c
index 05fafd0..a3cf358 100644
--- a/diff-no-index.c
+++ b/diff-no-index.c
@@ -13,7 +13,6 @@
 #include "diffcore.h"
 #include "revision.h"
 #include "log-tree.h"
-#include "builtin.h"
 #include "parse-options.h"
 #include "string-list.h"
 #include "dir.h"
diff --git a/diff.c b/diff.c
index 469e18a..1617aa5 100644
--- a/diff.c
+++ b/diff.c
@@ -2,12 +2,14 @@
  * Copyright (C) 2005 Junio C Hamano
  */
 #include "cache.h"
+#include "alloc.h"
 #include "config.h"
 #include "tempfile.h"
 #include "quote.h"
 #include "diff.h"
 #include "diffcore.h"
 #include "delta.h"
+#include "hex.h"
 #include "xdiff-interface.h"
 #include "color.h"
 #include "attr.h"
@@ -3374,6 +3376,17 @@
 		options->b_prefix = b;
 }
 
+void diff_set_noprefix(struct diff_options *options)
+{
+	options->a_prefix = options->b_prefix = "";
+}
+
+void diff_set_default_prefix(struct diff_options *options)
+{
+	options->a_prefix = "a/";
+	options->b_prefix = "b/";
+}
+
 struct userdiff_driver *get_textconv(struct repository *r,
 				     struct diff_filespec *one)
 {
@@ -4674,10 +4687,9 @@
 		options->flags.ignore_untracked_in_submodules = 1;
 
 	if (diff_no_prefix) {
-		options->a_prefix = options->b_prefix = "";
+		diff_set_noprefix(options);
 	} else if (!diff_mnemonic_prefix) {
-		options->a_prefix = "a/";
-		options->b_prefix = "b/";
+		diff_set_default_prefix(options);
 	}
 
 	options->color_moved = diff_color_moved_default;
@@ -5261,8 +5273,18 @@
 
 	BUG_ON_OPT_NEG(unset);
 	BUG_ON_OPT_ARG(optarg);
-	options->a_prefix = "";
-	options->b_prefix = "";
+	diff_set_noprefix(options);
+	return 0;
+}
+
+static int diff_opt_default_prefix(const struct option *opt,
+				   const char *optarg, int unset)
+{
+	struct diff_options *options = opt->value;
+
+	BUG_ON_OPT_NEG(unset);
+	BUG_ON_OPT_ARG(optarg);
+	diff_set_default_prefix(options);
 	return 0;
 }
 
@@ -5555,6 +5577,9 @@
 		OPT_CALLBACK_F(0, "no-prefix", options, NULL,
 			       N_("do not show any source or destination prefix"),
 			       PARSE_OPT_NONEG | PARSE_OPT_NOARG, diff_opt_no_prefix),
+		OPT_CALLBACK_F(0, "default-prefix", options, NULL,
+			       N_("use default prefixes a/ and b/"),
+			       PARSE_OPT_NONEG | PARSE_OPT_NOARG, diff_opt_default_prefix),
 		OPT_INTEGER_F(0, "inter-hunk-context", &options->interhunkcontext,
 			      N_("show context between diff hunks up to the specified number of lines"),
 			      PARSE_OPT_NONEG),
diff --git a/diff.h b/diff.h
index 8d770b1..09627f6 100644
--- a/diff.h
+++ b/diff.h
@@ -6,8 +6,8 @@
 
 #include "tree-walk.h"
 #include "pathspec.h"
-#include "object.h"
 #include "oidset.h"
+#include "strbuf.h"
 
 /**
  * The diff API is for programs that compare two sets of files (e.g. two trees,
@@ -71,7 +71,6 @@
 struct option;
 struct repository;
 struct rev_info;
-struct strbuf;
 struct userdiff_driver;
 
 typedef int (*pathchange_fn_t)(struct diff_options *options,
@@ -497,6 +496,8 @@
 void diff_tree_combined_merge(const struct commit *commit, struct rev_info *rev);
 
 void diff_set_mnemonic_prefix(struct diff_options *options, const char *a, const char *b);
+void diff_set_noprefix(struct diff_options *options);
+void diff_set_default_prefix(struct diff_options *options);
 
 int diff_can_quit_early(struct diff_options *);
 
diff --git a/diffcore-delta.c b/diffcore-delta.c
index 18d8f76..c30b56e 100644
--- a/diffcore-delta.c
+++ b/diffcore-delta.c
@@ -1,4 +1,4 @@
-#include "cache.h"
+#include "git-compat-util.h"
 #include "diff.h"
 #include "diffcore.h"
 
diff --git a/diffcore-order.c b/diffcore-order.c
index 19e7331..57ccab2 100644
--- a/diffcore-order.c
+++ b/diffcore-order.c
@@ -1,7 +1,8 @@
 /*
  * Copyright (C) 2005 Junio C Hamano
  */
-#include "cache.h"
+#include "git-compat-util.h"
+#include "gettext.h"
 #include "diff.h"
 #include "diffcore.h"
 
diff --git a/diffcore-pickaxe.c b/diffcore-pickaxe.c
index 03fcbcb..13c98a7 100644
--- a/diffcore-pickaxe.c
+++ b/diffcore-pickaxe.c
@@ -2,12 +2,12 @@
  * Copyright (C) 2005 Junio C Hamano
  * Copyright (C) 2010 Google Inc.
  */
-#include "cache.h"
+#include "git-compat-util.h"
 #include "diff.h"
 #include "diffcore.h"
 #include "xdiff-interface.h"
 #include "kwset.h"
-#include "commit.h"
+#include "pretty.h"
 #include "quote.h"
 
 typedef int (*pickaxe_fn)(mmfile_t *one, mmfile_t *two,
diff --git a/diffcore-rename.c b/diffcore-rename.c
index c0422d9..7e9ff96 100644
--- a/diffcore-rename.c
+++ b/diffcore-rename.c
@@ -2,14 +2,19 @@
  *
  * Copyright (C) 2005 Junio C Hamano
  */
-#include "cache.h"
+#include "git-compat-util.h"
+#include "alloc.h"
 #include "diff.h"
 #include "diffcore.h"
 #include "object-store.h"
 #include "hashmap.h"
+#include "mem-pool.h"
+#include "oid-array.h"
 #include "progress.h"
 #include "promisor-remote.h"
+#include "string-list.h"
 #include "strmap.h"
+#include "trace2.h"
 
 /* Table of rename/copy destinations */
 
diff --git a/diffcore-rotate.c b/diffcore-rotate.c
index 445f060..533986c 100644
--- a/diffcore-rotate.c
+++ b/diffcore-rotate.c
@@ -2,7 +2,8 @@
  * Copyright (C) 2021, Google LLC.
  * Based on diffcore-order.c, which is Copyright (C) 2005, Junio C Hamano
  */
-#include "cache.h"
+#include "git-compat-util.h"
+#include "gettext.h"
 #include "diff.h"
 #include "diffcore.h"
 
diff --git a/diffcore.h b/diffcore.h
index 9b588a1..1701ed5 100644
--- a/diffcore.h
+++ b/diffcore.h
@@ -4,9 +4,11 @@
 #ifndef DIFFCORE_H
 #define DIFFCORE_H
 
-#include "cache.h"
+#include "hash.h"
 
 struct diff_options;
+struct mem_pool;
+struct oid_array;
 struct repository;
 struct strintmap;
 struct strmap;
diff --git a/dir-iterator.c b/dir-iterator.c
index cedd304..fb7c47f 100644
--- a/dir-iterator.c
+++ b/dir-iterator.c
@@ -1,4 +1,5 @@
-#include "cache.h"
+#include "git-compat-util.h"
+#include "alloc.h"
 #include "dir.h"
 #include "iterator.h"
 #include "dir-iterator.h"
diff --git a/dir.c b/dir.c
index 4e99f0c..d5bb199 100644
--- a/dir.c
+++ b/dir.c
@@ -5,7 +5,8 @@
  * Copyright (C) Linus Torvalds, 2005-2006
  *		 Junio Hamano, 2005-2006
  */
-#include "cache.h"
+#include "git-compat-util.h"
+#include "alloc.h"
 #include "config.h"
 #include "dir.h"
 #include "object-store.h"
@@ -1190,7 +1191,7 @@
 	struct pattern_list *pl;
 	struct exclude_list_group *group;
 
-	group = &dir->exclude_list_group[group_type];
+	group = &dir->internal.exclude_list_group[group_type];
 	ALLOC_GROW(group->pl, group->nr + 1, group->alloc);
 	pl = &group->pl[group->nr++];
 	memset(pl, 0, sizeof(*pl));
@@ -1211,7 +1212,7 @@
 	 * differently when dir->untracked is non-NULL.
 	 */
 	if (!dir->untracked)
-		dir->unmanaged_exclude_files++;
+		dir->internal.unmanaged_exclude_files++;
 	pl = add_pattern_list(dir, EXC_FILE, fname);
 	if (add_patterns(fname, "", 0, pl, NULL, 0, oid_stat) < 0)
 		die(_("cannot use %s as an exclude file"), fname);
@@ -1219,7 +1220,7 @@
 
 void add_patterns_from_file(struct dir_struct *dir, const char *fname)
 {
-	dir->unmanaged_exclude_files++; /* see validate_untracked_cache() */
+	dir->internal.unmanaged_exclude_files++; /* see validate_untracked_cache() */
 	add_patterns_from_file_1(dir, fname, NULL);
 }
 
@@ -1519,7 +1520,7 @@
 	struct exclude_list_group *group;
 	struct path_pattern *pattern;
 	for (i = EXC_CMDL; i <= EXC_FILE; i++) {
-		group = &dir->exclude_list_group[i];
+		group = &dir->internal.exclude_list_group[i];
 		for (j = group->nr - 1; j >= 0; j--) {
 			pattern = last_matching_pattern_from_list(
 				pathname, pathlen, basename, dtype_p,
@@ -1545,20 +1546,20 @@
 	struct untracked_cache_dir *untracked;
 	int current;
 
-	group = &dir->exclude_list_group[EXC_DIRS];
+	group = &dir->internal.exclude_list_group[EXC_DIRS];
 
 	/*
 	 * Pop the exclude lists from the EXCL_DIRS exclude_list_group
 	 * which originate from directories not in the prefix of the
 	 * path being checked.
 	 */
-	while ((stk = dir->exclude_stack) != NULL) {
+	while ((stk = dir->internal.exclude_stack) != NULL) {
 		if (stk->baselen <= baselen &&
-		    !strncmp(dir->basebuf.buf, base, stk->baselen))
+		    !strncmp(dir->internal.basebuf.buf, base, stk->baselen))
 			break;
-		pl = &group->pl[dir->exclude_stack->exclude_ix];
-		dir->exclude_stack = stk->prev;
-		dir->pattern = NULL;
+		pl = &group->pl[dir->internal.exclude_stack->exclude_ix];
+		dir->internal.exclude_stack = stk->prev;
+		dir->internal.pattern = NULL;
 		free((char *)pl->src); /* see strbuf_detach() below */
 		clear_pattern_list(pl);
 		free(stk);
@@ -1566,7 +1567,7 @@
 	}
 
 	/* Skip traversing into sub directories if the parent is excluded */
-	if (dir->pattern)
+	if (dir->internal.pattern)
 		return;
 
 	/*
@@ -1574,12 +1575,12 @@
 	 * memset(dir, 0, sizeof(*dir)) before use. Changing all of
 	 * them seems lots of work for little benefit.
 	 */
-	if (!dir->basebuf.buf)
-		strbuf_init(&dir->basebuf, PATH_MAX);
+	if (!dir->internal.basebuf.buf)
+		strbuf_init(&dir->internal.basebuf, PATH_MAX);
 
 	/* Read from the parent directories and push them down. */
 	current = stk ? stk->baselen : -1;
-	strbuf_setlen(&dir->basebuf, current < 0 ? 0 : current);
+	strbuf_setlen(&dir->internal.basebuf, current < 0 ? 0 : current);
 	if (dir->untracked)
 		untracked = stk ? stk->ucd : dir->untracked->root;
 	else
@@ -1599,32 +1600,33 @@
 				die("oops in prep_exclude");
 			cp++;
 			untracked =
-				lookup_untracked(dir->untracked, untracked,
+				lookup_untracked(dir->untracked,
+						 untracked,
 						 base + current,
 						 cp - base - current);
 		}
-		stk->prev = dir->exclude_stack;
+		stk->prev = dir->internal.exclude_stack;
 		stk->baselen = cp - base;
 		stk->exclude_ix = group->nr;
 		stk->ucd = untracked;
 		pl = add_pattern_list(dir, EXC_DIRS, NULL);
-		strbuf_add(&dir->basebuf, base + current, stk->baselen - current);
-		assert(stk->baselen == dir->basebuf.len);
+		strbuf_add(&dir->internal.basebuf, base + current, stk->baselen - current);
+		assert(stk->baselen == dir->internal.basebuf.len);
 
 		/* Abort if the directory is excluded */
 		if (stk->baselen) {
 			int dt = DT_DIR;
-			dir->basebuf.buf[stk->baselen - 1] = 0;
-			dir->pattern = last_matching_pattern_from_lists(dir,
+			dir->internal.basebuf.buf[stk->baselen - 1] = 0;
+			dir->internal.pattern = last_matching_pattern_from_lists(dir,
 									istate,
-				dir->basebuf.buf, stk->baselen - 1,
-				dir->basebuf.buf + current, &dt);
-			dir->basebuf.buf[stk->baselen - 1] = '/';
-			if (dir->pattern &&
-			    dir->pattern->flags & PATTERN_FLAG_NEGATIVE)
-				dir->pattern = NULL;
-			if (dir->pattern) {
-				dir->exclude_stack = stk;
+				dir->internal.basebuf.buf, stk->baselen - 1,
+				dir->internal.basebuf.buf + current, &dt);
+			dir->internal.basebuf.buf[stk->baselen - 1] = '/';
+			if (dir->internal.pattern &&
+			    dir->internal.pattern->flags & PATTERN_FLAG_NEGATIVE)
+				dir->internal.pattern = NULL;
+			if (dir->internal.pattern) {
+				dir->internal.exclude_stack = stk;
 				return;
 			}
 		}
@@ -1647,15 +1649,15 @@
 		      */
 		     !is_null_oid(&untracked->exclude_oid))) {
 			/*
-			 * dir->basebuf gets reused by the traversal, but we
-			 * need fname to remain unchanged to ensure the src
-			 * member of each struct path_pattern correctly
+			 * dir->internal.basebuf gets reused by the traversal,
+			 * but we need fname to remain unchanged to ensure the
+			 * src member of each struct path_pattern correctly
 			 * back-references its source file.  Other invocations
 			 * of add_pattern_list provide stable strings, so we
 			 * strbuf_detach() and free() here in the caller.
 			 */
 			struct strbuf sb = STRBUF_INIT;
-			strbuf_addbuf(&sb, &dir->basebuf);
+			strbuf_addbuf(&sb, &dir->internal.basebuf);
 			strbuf_addstr(&sb, dir->exclude_per_dir);
 			pl->src = strbuf_detach(&sb, NULL);
 			add_patterns(pl->src, pl->src, stk->baselen, pl, istate,
@@ -1681,10 +1683,10 @@
 			invalidate_gitignore(dir->untracked, untracked);
 			oidcpy(&untracked->exclude_oid, &oid_stat.oid);
 		}
-		dir->exclude_stack = stk;
+		dir->internal.exclude_stack = stk;
 		current = stk->baselen;
 	}
-	strbuf_setlen(&dir->basebuf, baselen);
+	strbuf_setlen(&dir->internal.basebuf, baselen);
 }
 
 /*
@@ -1704,8 +1706,8 @@
 
 	prep_exclude(dir, istate, pathname, basename-pathname);
 
-	if (dir->pattern)
-		return dir->pattern;
+	if (dir->internal.pattern)
+		return dir->internal.pattern;
 
 	return last_matching_pattern_from_lists(dir, istate, pathname, pathlen,
 			basename, dtype_p);
@@ -1742,7 +1744,7 @@
 	if (index_file_exists(istate, pathname, len, ignore_case))
 		return NULL;
 
-	ALLOC_GROW(dir->entries, dir->nr+1, dir->alloc);
+	ALLOC_GROW(dir->entries, dir->nr+1, dir->internal.alloc);
 	return dir->entries[dir->nr++] = dir_entry_new(pathname, len);
 }
 
@@ -1753,7 +1755,7 @@
 	if (!index_name_is_other(istate, pathname, len))
 		return NULL;
 
-	ALLOC_GROW(dir->ignored, dir->ignored_nr+1, dir->ignored_alloc);
+	ALLOC_GROW(dir->ignored, dir->ignored_nr+1, dir->internal.ignored_alloc);
 	return dir->ignored[dir->ignored_nr++] = dir_entry_new(pathname, len);
 }
 
@@ -2569,7 +2571,7 @@
 
 	if (open_cached_dir(&cdir, dir, untracked, istate, &path, check_only))
 		goto out;
-	dir->visited_directories++;
+	dir->internal.visited_directories++;
 
 	if (untracked)
 		untracked->check_only = !!check_only;
@@ -2578,7 +2580,7 @@
 		/* check how the file or directory should be treated */
 		state = treat_path(dir, untracked, &cdir, istate, &path,
 				   baselen, pathspec);
-		dir->visited_paths++;
+		dir->internal.visited_paths++;
 
 		if (state > dir_state)
 			dir_state = state;
@@ -2586,7 +2588,8 @@
 		/* recurse into subdir if instructed by treat_path */
 		if (state == path_recurse) {
 			struct untracked_cache_dir *ud;
-			ud = lookup_untracked(dir->untracked, untracked,
+			ud = lookup_untracked(dir->untracked,
+					      untracked,
 					      path.buf + baselen,
 					      path.len - baselen);
 			subdir_state =
@@ -2846,7 +2849,7 @@
 	 * condition also catches running setup_standard_excludes()
 	 * before setting dir->untracked!
 	 */
-	if (dir->unmanaged_exclude_files)
+	if (dir->internal.unmanaged_exclude_files)
 		return NULL;
 
 	/*
@@ -2875,7 +2878,7 @@
 	 * EXC_CMDL is not considered in the cache. If people set it,
 	 * skip the cache.
 	 */
-	if (dir->exclude_list_group[EXC_CMDL].nr)
+	if (dir->internal.exclude_list_group[EXC_CMDL].nr)
 		return NULL;
 
 	if (!ident_in_untracked(dir->untracked)) {
@@ -2935,15 +2938,15 @@
 
 	/* Validate $GIT_DIR/info/exclude and core.excludesfile */
 	root = dir->untracked->root;
-	if (!oideq(&dir->ss_info_exclude.oid,
+	if (!oideq(&dir->internal.ss_info_exclude.oid,
 		   &dir->untracked->ss_info_exclude.oid)) {
 		invalidate_gitignore(dir->untracked, root);
-		dir->untracked->ss_info_exclude = dir->ss_info_exclude;
+		dir->untracked->ss_info_exclude = dir->internal.ss_info_exclude;
 	}
-	if (!oideq(&dir->ss_excludes_file.oid,
+	if (!oideq(&dir->internal.ss_excludes_file.oid,
 		   &dir->untracked->ss_excludes_file.oid)) {
 		invalidate_gitignore(dir->untracked, root);
-		dir->untracked->ss_excludes_file = dir->ss_excludes_file;
+		dir->untracked->ss_excludes_file = dir->internal.ss_excludes_file;
 	}
 
 	/* Make sure this directory is not dropped out at saving phase */
@@ -2969,9 +2972,9 @@
 	}
 
 	trace2_data_intmax("read_directory", repo,
-			   "directories-visited", dir->visited_directories);
+			   "directories-visited", dir->internal.visited_directories);
 	trace2_data_intmax("read_directory", repo,
-			   "paths-visited", dir->visited_paths);
+			   "paths-visited", dir->internal.visited_paths);
 
 	if (!dir->untracked)
 		return;
@@ -2993,8 +2996,8 @@
 	struct untracked_cache_dir *untracked;
 
 	trace2_region_enter("dir", "read_directory", istate->repo);
-	dir->visited_paths = 0;
-	dir->visited_directories = 0;
+	dir->internal.visited_paths = 0;
+	dir->internal.visited_directories = 0;
 
 	if (has_symlink_leading_path(path, len)) {
 		trace2_region_leave("dir", "read_directory", istate->repo);
@@ -3342,14 +3345,14 @@
 		excludes_file = xdg_config_home("ignore");
 	if (excludes_file && !access_or_warn(excludes_file, R_OK, 0))
 		add_patterns_from_file_1(dir, excludes_file,
-					 dir->untracked ? &dir->ss_excludes_file : NULL);
+					 dir->untracked ? &dir->internal.ss_excludes_file : NULL);
 
 	/* per repository user preference */
 	if (startup_info->have_repository) {
 		const char *path = git_path_info_exclude();
 		if (!access_or_warn(path, R_OK, 0))
 			add_patterns_from_file_1(dir, path,
-						 dir->untracked ? &dir->ss_info_exclude : NULL);
+						 dir->untracked ? &dir->internal.ss_info_exclude : NULL);
 	}
 }
 
@@ -3405,7 +3408,7 @@
 	struct dir_struct new = DIR_INIT;
 
 	for (i = EXC_CMDL; i <= EXC_FILE; i++) {
-		group = &dir->exclude_list_group[i];
+		group = &dir->internal.exclude_list_group[i];
 		for (j = 0; j < group->nr; j++) {
 			pl = &group->pl[j];
 			if (i == EXC_DIRS)
@@ -3422,13 +3425,13 @@
 	free(dir->ignored);
 	free(dir->entries);
 
-	stk = dir->exclude_stack;
+	stk = dir->internal.exclude_stack;
 	while (stk) {
 		struct exclude_stack *prev = stk->prev;
 		free(stk);
 		stk = prev;
 	}
-	strbuf_release(&dir->basebuf);
+	strbuf_release(&dir->internal.basebuf);
 
 	memcpy(dir, &new, sizeof(*dir));
 }
diff --git a/dir.h b/dir.h
index 8acfc04..3d6c873 100644
--- a/dir.h
+++ b/dir.h
@@ -1,8 +1,9 @@
 #ifndef DIR_H
 #define DIR_H
 
-#include "cache.h"
 #include "hashmap.h"
+#include "pathspec.h"
+#include "statinfo.h"
 #include "strbuf.h"
 
 /**
@@ -212,17 +213,6 @@
  */
 struct dir_struct {
 
-	/* The number of members in `entries[]` array. */
-	int nr;
-
-	/* Internal use; keeps track of allocation of `entries[]` array.*/
-	int alloc;
-
-	/* The number of members in `ignored[]` array. */
-	int ignored_nr;
-
-	int ignored_alloc;
-
 	/* bit-field of options */
 	enum {
 
@@ -287,60 +277,81 @@
 		DIR_SKIP_NESTED_GIT = 1<<9
 	} flags;
 
+	/* The number of members in `entries[]` array. */
+	int nr; /* output only */
+
+	/* The number of members in `ignored[]` array. */
+	int ignored_nr; /* output only */
+
 	/* An array of `struct dir_entry`, each element of which describes a path. */
-	struct dir_entry **entries;
+	struct dir_entry **entries; /* output only */
 
 	/**
 	 * used for ignored paths with the `DIR_SHOW_IGNORED_TOO` and
 	 * `DIR_COLLECT_IGNORED` flags.
 	 */
-	struct dir_entry **ignored;
+	struct dir_entry **ignored; /* output only */
+
+	/* Enable/update untracked file cache if set */
+	struct untracked_cache *untracked;
 
 	/**
-	 * The name of the file to be read in each directory for excluded files
-	 * (typically `.gitignore`).
+	 * Deprecated: ls-files is the only allowed caller; all other callers
+	 * should leave this as NULL; it pre-dated the
+	 * setup_standard_excludes() mechanism that replaces this.
+	 *
+	 * This field tracks the name of the file to be read in each directory
+	 * for excluded files (typically `.gitignore`).
 	 */
 	const char *exclude_per_dir;
 
-	/*
-	 * We maintain three groups of exclude pattern lists:
-	 *
-	 * EXC_CMDL lists patterns explicitly given on the command line.
-	 * EXC_DIRS lists patterns obtained from per-directory ignore files.
-	 * EXC_FILE lists patterns from fallback ignore files, e.g.
-	 *   - .git/info/exclude
-	 *   - core.excludesfile
-	 *
-	 * Each group contains multiple exclude lists, a single list
-	 * per source.
-	 */
+	struct dir_struct_internal {
+		/* Keeps track of allocation of `entries[]` array.*/
+		int alloc;
+
+		/* Keeps track of allocation of `ignored[]` array. */
+		int ignored_alloc;
+
+		/*
+		 * We maintain three groups of exclude pattern lists:
+		 *
+		 * EXC_CMDL lists patterns explicitly given on the command line.
+		 * EXC_DIRS lists patterns obtained from per-directory ignore
+		 *          files.
+		 * EXC_FILE lists patterns from fallback ignore files, e.g.
+		 *   - .git/info/exclude
+		 *   - core.excludesfile
+		 *
+		 * Each group contains multiple exclude lists, a single list
+		 * per source.
+		 */
 #define EXC_CMDL 0
 #define EXC_DIRS 1
 #define EXC_FILE 2
-	struct exclude_list_group exclude_list_group[3];
+		struct exclude_list_group exclude_list_group[3];
 
-	/*
-	 * Temporary variables which are used during loading of the
-	 * per-directory exclude lists.
-	 *
-	 * exclude_stack points to the top of the exclude_stack, and
-	 * basebuf contains the full path to the current
-	 * (sub)directory in the traversal. Exclude points to the
-	 * matching exclude struct if the directory is excluded.
-	 */
-	struct exclude_stack *exclude_stack;
-	struct path_pattern *pattern;
-	struct strbuf basebuf;
+		/*
+		 * Temporary variables which are used during loading of the
+		 * per-directory exclude lists.
+		 *
+		 * exclude_stack points to the top of the exclude_stack, and
+		 * basebuf contains the full path to the current
+		 * (sub)directory in the traversal. Exclude points to the
+		 * matching exclude struct if the directory is excluded.
+		 */
+		struct exclude_stack *exclude_stack;
+		struct path_pattern *pattern;
+		struct strbuf basebuf;
 
-	/* Enable untracked file cache if set */
-	struct untracked_cache *untracked;
-	struct oid_stat ss_info_exclude;
-	struct oid_stat ss_excludes_file;
-	unsigned unmanaged_exclude_files;
+		/* Additional metadata related to 'untracked' */
+		struct oid_stat ss_info_exclude;
+		struct oid_stat ss_excludes_file;
+		unsigned unmanaged_exclude_files;
 
-	/* Stats about the traversal */
-	unsigned visited_paths;
-	unsigned visited_directories;
+		/* Stats about the traversal */
+		unsigned visited_paths;
+		unsigned visited_directories;
+	} internal;
 };
 
 #define DIR_INIT { 0 }
@@ -363,10 +374,6 @@
 int simple_length(const char *match);
 int no_wildcard(const char *string);
 char *common_prefix(const struct pathspec *pathspec);
-int match_pathspec(struct index_state *istate,
-		   const struct pathspec *pathspec,
-		   const char *name, int namelen,
-		   int prefix, char *seen, int is_dir);
 int report_path_error(const char *ps_matched, const struct pathspec *pathspec);
 int within_depth(const char *name, int namelen, int depth, int max_depth);
 
@@ -533,15 +540,6 @@
 			 const char *submodule_name,
 			 char *seen);
 
-static inline int ce_path_match(struct index_state *istate,
-				const struct cache_entry *ce,
-				const struct pathspec *pathspec,
-				char *seen)
-{
-	return match_pathspec(istate, pathspec, ce->name, ce_namelen(ce), 0, seen,
-			      S_ISDIR(ce->ce_mode) || S_ISGITLINK(ce->ce_mode));
-}
-
 static inline int dir_path_match(struct index_state *istate,
 				 const struct dir_entry *ent,
 				 const struct pathspec *pathspec,
diff --git a/entry.c b/entry.c
index 971ab26..c97cfa8 100644
--- a/entry.c
+++ b/entry.c
@@ -2,6 +2,7 @@
 #include "blob.h"
 #include "object-store.h"
 #include "dir.h"
+#include "hex.h"
 #include "streaming.h"
 #include "submodule.h"
 #include "progress.h"
diff --git a/entry.h b/entry.h
index 2d4fbb8..7329f91 100644
--- a/entry.h
+++ b/entry.h
@@ -1,9 +1,11 @@
 #ifndef ENTRY_H
 #define ENTRY_H
 
-#include "cache.h"
 #include "convert.h"
 
+struct cache_entry;
+struct index_state;
+
 struct checkout {
 	struct index_state *istate;
 	const char *base_dir;
diff --git a/environment.c b/environment.c
index 1ee3686..89d8911 100644
--- a/environment.c
+++ b/environment.c
@@ -17,6 +17,7 @@
 #include "commit.h"
 #include "strvec.h"
 #include "object-store.h"
+#include "replace-object.h"
 #include "tmp-objdir.h"
 #include "chdir-notify.h"
 #include "shallow.h"
diff --git a/ewah/bitmap.c b/ewah/bitmap.c
index ac61864..12d6aa3 100644
--- a/ewah/bitmap.c
+++ b/ewah/bitmap.c
@@ -16,7 +16,8 @@
  * You should have received a copy of the GNU General Public License
  * along with this program; if not, see <http://www.gnu.org/licenses/>.
  */
-#include "cache.h"
+#include "git-compat-util.h"
+#include "alloc.h"
 #include "ewok.h"
 
 #define EWAH_MASK(x) ((eword_t)1 << (x % BITS_IN_EWORD))
diff --git a/ewah/ewah_bitmap.c b/ewah/ewah_bitmap.c
index 6fe48d3..c6d4ffc 100644
--- a/ewah/ewah_bitmap.c
+++ b/ewah/ewah_bitmap.c
@@ -17,9 +17,9 @@
  * along with this program; if not, see <http://www.gnu.org/licenses/>.
  */
 #include "git-compat-util.h"
+#include "alloc.h"
 #include "ewok.h"
 #include "ewok_rlw.h"
-#include "cache.h"
 
 static inline size_t min_size(size_t a, size_t b)
 {
diff --git a/fetch-pack.c b/fetch-pack.c
index 04016d1..4ddabb4 100644
--- a/fetch-pack.c
+++ b/fetch-pack.c
@@ -1,6 +1,8 @@
-#include "cache.h"
+#include "git-compat-util.h"
+#include "alloc.h"
 #include "repository.h"
 #include "config.h"
+#include "hex.h"
 #include "lockfile.h"
 #include "refs.h"
 #include "pkt-line.h"
@@ -722,7 +724,7 @@
 	*refs = newlist;
 }
 
-static void mark_alternate_complete(struct fetch_negotiator *unused,
+static void mark_alternate_complete(struct fetch_negotiator *negotiator UNUSED,
 				    struct object *obj)
 {
 	mark_complete(&obj->oid);
diff --git a/fmt-merge-msg.c b/fmt-merge-msg.c
index f48f44f..24cc44b 100644
--- a/fmt-merge-msg.c
+++ b/fmt-merge-msg.c
@@ -1,8 +1,11 @@
+#include "git-compat-util.h"
+#include "alloc.h"
 #include "config.h"
 #include "refs.h"
 #include "object-store.h"
 #include "diff.h"
 #include "diff-merges.h"
+#include "hex.h"
 #include "revision.h"
 #include "tag.h"
 #include "string-list.h"
@@ -17,8 +20,6 @@
 
 int fmt_merge_msg_config(const char *key, const char *value, void *cb)
 {
-	int status = 0;
-
 	if (!strcmp(key, "merge.log") || !strcmp(key, "merge.summary")) {
 		int is_bool;
 		merge_log_config = git_config_bool_or_int(key, value, &is_bool);
@@ -37,9 +38,6 @@
 			string_list_append(&suppress_dest_patterns, value);
 		suppress_dest_pattern_seen = 1;
 	} else {
-		status = git_gpg_config(key, value, NULL);
-		if (status)
-			return status;
 		return git_default_config(key, value, cb);
 	}
 	return 0;
diff --git a/fsck.c b/fsck.c
index 2b18717..871c0a9 100644
--- a/fsck.c
+++ b/fsck.c
@@ -1,4 +1,6 @@
-#include "cache.h"
+#include "git-compat-util.h"
+#include "alloc.h"
+#include "hex.h"
 #include "object-store.h"
 #include "repository.h"
 #include "object.h"
diff --git a/fsck.h b/fsck.h
index 6683308..e17730e 100644
--- a/fsck.h
+++ b/fsck.h
@@ -1,6 +1,7 @@
 #ifndef GIT_FSCK_H
 #define GIT_FSCK_H
 
+#include "object.h"
 #include "oidset.h"
 
 enum fsck_msg_type {
diff --git a/fsmonitor-settings.c b/fsmonitor-settings.c
index 899bfe9..b62acf4 100644
--- a/fsmonitor-settings.c
+++ b/fsmonitor-settings.c
@@ -1,5 +1,6 @@
-#include "cache.h"
+#include "git-compat-util.h"
 #include "config.h"
+#include "gettext.h"
 #include "repository.h"
 #include "fsmonitor-ipc.h"
 #include "fsmonitor-settings.h"
diff --git a/git-compat-util.h b/git-compat-util.h
index 871c945..4a200a9 100644
--- a/git-compat-util.h
+++ b/git-compat-util.h
@@ -1244,6 +1244,7 @@
 #undef isxdigit
 
 extern const unsigned char sane_ctype[256];
+extern const signed char hexval_table[256];
 #define GIT_SPACE 0x01
 #define GIT_DIGIT 0x02
 #define GIT_ALPHA 0x04
@@ -1306,6 +1307,25 @@
 	return 0;
 }
 
+/*
+ * Like skip_prefix_mem, but compare case-insensitively. Note that the
+ * comparison is done via tolower(), so it is strictly ASCII (no multi-byte
+ * characters or locale-specific conversions).
+ */
+static inline int skip_iprefix_mem(const char *buf, size_t len,
+				   const char *prefix,
+				   const char **out, size_t *outlen)
+{
+	do {
+		if (!*prefix) {
+			*out = buf;
+			*outlen = len;
+			return 1;
+		}
+	} while (len-- > 0 && tolower(*buf++) == tolower(*prefix++));
+	return 0;
+}
+
 static inline int strtoul_ui(char const *s, int base, unsigned int *result)
 {
 	unsigned long ul;
diff --git a/git.c b/git.c
index 6171fd6..ae2134f 100644
--- a/git.c
+++ b/git.c
@@ -4,6 +4,7 @@
 #include "help.h"
 #include "run-command.h"
 #include "alias.h"
+#include "replace-object.h"
 #include "shallow.h"
 
 #define RUN_SETUP		(1<<0)
diff --git a/gpg-interface.c b/gpg-interface.c
index 5cd66d3..855970b 100644
--- a/gpg-interface.c
+++ b/gpg-interface.c
@@ -4,11 +4,24 @@
 #include "run-command.h"
 #include "strbuf.h"
 #include "dir.h"
+#include "ident.h"
 #include "gpg-interface.h"
 #include "sigchain.h"
 #include "tempfile.h"
 #include "alias.h"
 
+static int git_gpg_config(const char *, const char *, void *);
+
+static void gpg_interface_lazy_init(void)
+{
+	static int done;
+
+	if (done)
+		return;
+	done = 1;
+	git_config(git_gpg_config, NULL);
+}
+
 static char *configured_signing_key;
 static const char *ssh_default_key_command, *ssh_allowed_signers, *ssh_revocation_file;
 static enum signature_trust_level configured_min_trust_level = TRUST_UNDEFINED;
@@ -632,6 +645,8 @@
 	struct gpg_format *fmt;
 	int status;
 
+	gpg_interface_lazy_init();
+
 	sigc->result = 'N';
 	sigc->trust_level = -1;
 
@@ -695,11 +710,13 @@
 
 void set_signing_key(const char *key)
 {
+	gpg_interface_lazy_init();
+
 	free(configured_signing_key);
 	configured_signing_key = xstrdup(key);
 }
 
-int git_gpg_config(const char *var, const char *value, void *cb UNUSED)
+static int git_gpg_config(const char *var, const char *value, void *cb UNUSED)
 {
 	struct gpg_format *fmt = NULL;
 	char *fmtname = NULL;
@@ -888,6 +905,8 @@
 /* Returns a textual but unique representation of the signing key */
 const char *get_signing_key_id(void)
 {
+	gpg_interface_lazy_init();
+
 	if (use_format->get_key_id) {
 		return use_format->get_key_id();
 	}
@@ -898,6 +917,8 @@
 
 const char *get_signing_key(void)
 {
+	gpg_interface_lazy_init();
+
 	if (configured_signing_key)
 		return configured_signing_key;
 	if (use_format->get_default_key) {
@@ -923,6 +944,8 @@
 
 int sign_buffer(struct strbuf *buffer, struct strbuf *signature, const char *signing_key)
 {
+	gpg_interface_lazy_init();
+
 	return use_format->sign_buffer(buffer, signature, signing_key);
 }
 
diff --git a/gpg-interface.h b/gpg-interface.h
index 8a9ef41..143cdc1 100644
--- a/gpg-interface.h
+++ b/gpg-interface.h
@@ -79,7 +79,6 @@
  */
 const char *gpg_trust_level_to_str(enum signature_trust_level level);
 
-int git_gpg_config(const char *, const char *, void *);
 void set_signing_key(const char *);
 const char *get_signing_key(void);
 
diff --git a/graph.c b/graph.c
index 568b6e7..2a9dc43 100644
--- a/graph.c
+++ b/graph.c
@@ -1,4 +1,5 @@
-#include "cache.h"
+#include "git-compat-util.h"
+#include "gettext.h"
 #include "config.h"
 #include "commit.h"
 #include "color.h"
diff --git a/grep.c b/grep.c
index cee44a7..68e9328 100644
--- a/grep.c
+++ b/grep.c
@@ -1,6 +1,7 @@
 #include "cache.h"
 #include "config.h"
 #include "grep.h"
+#include "hex.h"
 #include "object-store.h"
 #include "userdiff.h"
 #include "xdiff-interface.h"
diff --git a/hash.h b/hash.h
index 36b6416..d39f736 100644
--- a/hash.h
+++ b/hash.h
@@ -1,7 +1,6 @@
 #ifndef HASH_H
 #define HASH_H
 
-#include "git-compat-util.h"
 #include "repository.h"
 
 #if defined(SHA1_APPLE)
@@ -124,6 +123,40 @@
 	int algo;	/* XXX requires 4-byte alignment */
 };
 
+#define GET_OID_QUIETLY           01
+#define GET_OID_COMMIT            02
+#define GET_OID_COMMITTISH        04
+#define GET_OID_TREE             010
+#define GET_OID_TREEISH          020
+#define GET_OID_BLOB             040
+#define GET_OID_FOLLOW_SYMLINKS 0100
+#define GET_OID_RECORD_PATH     0200
+#define GET_OID_ONLY_TO_DIE    04000
+#define GET_OID_REQUIRE_PATH  010000
+
+#define GET_OID_DISAMBIGUATORS \
+	(GET_OID_COMMIT | GET_OID_COMMITTISH | \
+	GET_OID_TREE | GET_OID_TREEISH | \
+	GET_OID_BLOB)
+
+enum get_oid_result {
+	FOUND = 0,
+	MISSING_OBJECT = -1, /* The requested object is missing */
+	SHORT_NAME_AMBIGUOUS = -2,
+	/* The following only apply when symlinks are followed */
+	DANGLING_SYMLINK = -4, /*
+				* The initial symlink is there, but
+				* (transitively) points to a missing
+				* in-tree file
+				*/
+	SYMLINK_LOOP = -5,
+	NOT_DIR = -6, /*
+		       * Somewhere along the symlink chain, a path is
+		       * requested which contains a file as a
+		       * non-final element.
+		       */
+};
+
 /* A suitably aligned type for stack allocations of hash contexts. */
 union git_hash_ctx {
 	git_SHA_CTX sha1;
diff --git a/hashmap.c b/hashmap.c
index cf5fea8..ee45ef0 100644
--- a/hashmap.c
+++ b/hashmap.c
@@ -1,7 +1,7 @@
 /*
  * Generic implementation of hash-based key value mappings.
  */
-#include "cache.h"
+#include "git-compat-util.h"
 #include "hashmap.h"
 
 #define FNV32_BASE ((unsigned int) 0x811c9dc5)
diff --git a/help.c b/help.c
index 812af4c..5d7637d 100644
--- a/help.c
+++ b/help.c
@@ -1,9 +1,11 @@
-#include "cache.h"
+#include "git-compat-util.h"
+#include "alloc.h"
 #include "config.h"
 #include "builtin.h"
 #include "exec-cmd.h"
 #include "run-command.h"
 #include "levenshtein.h"
+#include "gettext.h"
 #include "help.h"
 #include "command-list.h"
 #include "string-list.h"
@@ -540,7 +542,8 @@
 #define AUTOCORRECT_NEVER (-2)
 #define AUTOCORRECT_IMMEDIATELY (-1)
 
-static int git_unknown_cmd_config(const char *var, const char *value, void *cb)
+static int git_unknown_cmd_config(const char *var, const char *value,
+				  void *cb UNUSED)
 {
 	const char *p;
 
diff --git a/hex.c b/hex.c
index 4f64d34..0a1bddc 100644
--- a/hex.c
+++ b/hex.c
@@ -1,4 +1,5 @@
-#include "cache.h"
+#include "git-compat-util.h"
+#include "hex.h"
 
 const signed char hexval_table[256] = {
 	 -1, -1, -1, -1, -1, -1, -1, -1,		/* 00-07 */
diff --git a/hex.h b/hex.h
new file mode 100644
index 0000000..e2abfc5
--- /dev/null
+++ b/hex.h
@@ -0,0 +1,84 @@
+#ifndef HEX_H
+#define HEX_H
+
+#include "hash.h"
+
+extern const signed char hexval_table[256];
+static inline unsigned int hexval(unsigned char c)
+{
+	return hexval_table[c];
+}
+
+/*
+ * Convert two consecutive hexadecimal digits into a char.  Return a
+ * negative value on error.  Don't run over the end of short strings.
+ */
+static inline int hex2chr(const char *s)
+{
+	unsigned int val = hexval(s[0]);
+	return (val & ~0xf) ? val : (val << 4) | hexval(s[1]);
+}
+
+/*
+ * Try to read a SHA1 in hexadecimal format from the 40 characters
+ * starting at hex.  Write the 20-byte result to sha1 in binary form.
+ * Return 0 on success.  Reading stops if a NUL is encountered in the
+ * input, so it is safe to pass this function an arbitrary
+ * null-terminated string.
+ */
+int get_sha1_hex(const char *hex, unsigned char *sha1);
+int get_oid_hex(const char *hex, struct object_id *sha1);
+
+/* Like get_oid_hex, but for an arbitrary hash algorithm. */
+int get_oid_hex_algop(const char *hex, struct object_id *oid, const struct git_hash_algo *algop);
+
+/*
+ * Read `len` pairs of hexadecimal digits from `hex` and write the
+ * values to `binary` as `len` bytes. Return 0 on success, or -1 if
+ * the input does not consist of hex digits).
+ */
+int hex_to_bytes(unsigned char *binary, const char *hex, size_t len);
+
+/*
+ * Convert a binary hash in "unsigned char []" or an object name in
+ * "struct object_id *" to its hex equivalent. The `_r` variant is reentrant,
+ * and writes the NUL-terminated output to the buffer `out`, which must be at
+ * least `GIT_MAX_HEXSZ + 1` bytes, and returns a pointer to out for
+ * convenience.
+ *
+ * The non-`_r` variant returns a static buffer, but uses a ring of 4
+ * buffers, making it safe to make multiple calls for a single statement, like:
+ *
+ *   printf("%s -> %s", hash_to_hex(one), hash_to_hex(two));
+ *   printf("%s -> %s", oid_to_hex(one), oid_to_hex(two));
+ */
+char *hash_to_hex_algop_r(char *buffer, const unsigned char *hash, const struct git_hash_algo *);
+char *oid_to_hex_r(char *out, const struct object_id *oid);
+char *hash_to_hex_algop(const unsigned char *hash, const struct git_hash_algo *);	/* static buffer result! */
+char *hash_to_hex(const unsigned char *hash);						/* same static buffer */
+char *oid_to_hex(const struct object_id *oid);						/* same static buffer */
+
+/*
+ * Parse a 40-character hexadecimal object ID starting from hex, updating the
+ * pointer specified by end when parsing stops.  The resulting object ID is
+ * stored in oid.  Returns 0 on success.  Parsing will stop on the first NUL or
+ * other invalid character.  end is only updated on success; otherwise, it is
+ * unmodified.
+ */
+int parse_oid_hex(const char *hex, struct object_id *oid, const char **end);
+
+/* Like parse_oid_hex, but for an arbitrary hash algorithm. */
+int parse_oid_hex_algop(const char *hex, struct object_id *oid, const char **end,
+			const struct git_hash_algo *algo);
+
+
+/*
+ * These functions work like get_oid_hex and parse_oid_hex, but they will parse
+ * a hex value for any algorithm. The algorithm is detected based on the length
+ * and the algorithm in use is returned. If this is not a hex object ID in any
+ * algorithm, returns GIT_HASH_UNKNOWN.
+ */
+int get_oid_hex_any(const char *hex, struct object_id *oid);
+int parse_oid_hex_any(const char *hex, struct object_id *oid, const char **end);
+
+#endif
diff --git a/hook.c b/hook.c
index 1a84831..76e322f 100644
--- a/hook.c
+++ b/hook.c
@@ -1,7 +1,10 @@
-#include "cache.h"
+#include "git-compat-util.h"
+#include "advice.h"
+#include "gettext.h"
 #include "hook.h"
 #include "run-command.h"
 #include "config.h"
+#include "strbuf.h"
 
 const char *find_hook(const char *name)
 {
@@ -43,9 +46,9 @@
 }
 
 static int pick_next_hook(struct child_process *cp,
-			  struct strbuf *out,
+			  struct strbuf *out UNUSED,
 			  void *pp_cb,
-			  void **pp_task_cb)
+			  void **pp_task_cb UNUSED)
 {
 	struct hook_cb_data *hook_cb = pp_cb;
 	const char *hook_path = hook_cb->hook_path;
@@ -77,9 +80,9 @@
 	return 1;
 }
 
-static int notify_start_failure(struct strbuf *out,
+static int notify_start_failure(struct strbuf *out UNUSED,
 				void *pp_cb,
-				void *pp_task_cp)
+				void *pp_task_cp UNUSED)
 {
 	struct hook_cb_data *hook_cb = pp_cb;
 
@@ -89,9 +92,9 @@
 }
 
 static int notify_hook_finished(int result,
-				struct strbuf *out,
+				struct strbuf *out UNUSED,
 				void *pp_cb,
-				void *pp_task_cb)
+				void *pp_task_cb UNUSED)
 {
 	struct hook_cb_data *hook_cb = pp_cb;
 	struct run_hooks_opt *opt = hook_cb->options;
diff --git a/http-backend.c b/http-backend.c
index 8ab58e5..9cfc6f2 100644
--- a/http-backend.c
+++ b/http-backend.c
@@ -1,5 +1,7 @@
-#include "cache.h"
+#include "git-compat-util.h"
+#include "alloc.h"
 #include "config.h"
+#include "hex.h"
 #include "repository.h"
 #include "refs.h"
 #include "pkt-line.h"
@@ -524,7 +526,7 @@
 	return 0;
 }
 
-static void get_info_refs(struct strbuf *hdr, char *arg)
+static void get_info_refs(struct strbuf *hdr, char *arg UNUSED)
 {
 	const char *service_name = get_parameter("service");
 	struct strbuf buf = STRBUF_INIT;
@@ -578,7 +580,7 @@
 	return 0;
 }
 
-static void get_head(struct strbuf *hdr, char *arg)
+static void get_head(struct strbuf *hdr, char *arg UNUSED)
 {
 	struct strbuf buf = STRBUF_INIT;
 
@@ -588,7 +590,7 @@
 	strbuf_release(&buf);
 }
 
-static void get_info_packs(struct strbuf *hdr, char *arg)
+static void get_info_packs(struct strbuf *hdr, char *arg UNUSED)
 {
 	size_t objdirlen = strlen(get_object_directory());
 	struct strbuf buf = STRBUF_INIT;
@@ -736,7 +738,7 @@
 	return 0;
 }
 
-int cmd_main(int argc, const char **argv)
+int cmd_main(int argc UNUSED, const char **argv UNUSED)
 {
 	char *method = getenv("REQUEST_METHOD");
 	const char *proto_header;
diff --git a/http-fetch.c b/http-fetch.c
index 258fec2..8db35b9 100644
--- a/http-fetch.c
+++ b/http-fetch.c
@@ -1,6 +1,7 @@
 #include "cache.h"
 #include "config.h"
 #include "exec-cmd.h"
+#include "hex.h"
 #include "http.h"
 #include "walker.h"
 #include "strvec.h"
diff --git a/http-push.c b/http-push.c
index 7f71316..88aa045 100644
--- a/http-push.c
+++ b/http-push.c
@@ -1,4 +1,5 @@
 #include "cache.h"
+#include "hex.h"
 #include "repository.h"
 #include "commit.h"
 #include "tag.h"
diff --git a/http-walker.c b/http-walker.c
index b8f0f98..c3e902c 100644
--- a/http-walker.c
+++ b/http-walker.c
@@ -1,6 +1,7 @@
 #include "cache.h"
 #include "repository.h"
 #include "commit.h"
+#include "hex.h"
 #include "walker.h"
 #include "http.h"
 #include "list.h"
diff --git a/http.c b/http.c
index c4b6dde..dbe4d29 100644
--- a/http.c
+++ b/http.c
@@ -1,5 +1,6 @@
 #include "git-compat-util.h"
 #include "git-curl-compat.h"
+#include "hex.h"
 #include "http.h"
 #include "config.h"
 #include "pack.h"
@@ -181,6 +182,115 @@
 	return nmemb;
 }
 
+/*
+ * A folded header continuation line starts with any number of spaces or
+ * horizontal tab characters (SP or HTAB) as per RFC 7230 section 3.2.
+ * It is not a continuation line if the line starts with any other character.
+ */
+static inline int is_hdr_continuation(const char *ptr, const size_t size)
+{
+	return size && (*ptr == ' ' || *ptr == '\t');
+}
+
+static size_t fwrite_wwwauth(char *ptr, size_t eltsize, size_t nmemb, void *p)
+{
+	size_t size = eltsize * nmemb;
+	struct strvec *values = &http_auth.wwwauth_headers;
+	struct strbuf buf = STRBUF_INIT;
+	const char *val;
+	size_t val_len;
+
+	/*
+	 * Header lines may not come NULL-terminated from libcurl so we must
+	 * limit all scans to the maximum length of the header line, or leverage
+	 * strbufs for all operations.
+	 *
+	 * In addition, it is possible that header values can be split over
+	 * multiple lines as per RFC 7230. 'Line folding' has been deprecated
+	 * but older servers may still emit them. A continuation header field
+	 * value is identified as starting with a space or horizontal tab.
+	 *
+	 * The formal definition of a header field as given in RFC 7230 is:
+	 *
+	 * header-field   = field-name ":" OWS field-value OWS
+	 *
+	 * field-name     = token
+	 * field-value    = *( field-content / obs-fold )
+	 * field-content  = field-vchar [ 1*( SP / HTAB ) field-vchar ]
+	 * field-vchar    = VCHAR / obs-text
+	 *
+	 * obs-fold       = CRLF 1*( SP / HTAB )
+	 *                ; obsolete line folding
+	 *                ; see Section 3.2.4
+	 */
+
+	/* Start of a new WWW-Authenticate header */
+	if (skip_iprefix_mem(ptr, size, "www-authenticate:", &val, &val_len)) {
+		strbuf_add(&buf, val, val_len);
+
+		/*
+		 * Strip the CRLF that should be present at the end of each
+		 * field as well as any trailing or leading whitespace from the
+		 * value.
+		 */
+		strbuf_trim(&buf);
+
+		strvec_push(values, buf.buf);
+		http_auth.header_is_last_match = 1;
+		goto exit;
+	}
+
+	/*
+	 * This line could be a continuation of the previously matched header
+	 * field. If this is the case then we should append this value to the
+	 * end of the previously consumed value.
+	 */
+	if (http_auth.header_is_last_match && is_hdr_continuation(ptr, size)) {
+		/*
+		 * Trim the CRLF and any leading or trailing from this line.
+		 */
+		strbuf_add(&buf, ptr, size);
+		strbuf_trim(&buf);
+
+		/*
+		 * At this point we should always have at least one existing
+		 * value, even if it is empty. Do not bother appending the new
+		 * value if this continuation header is itself empty.
+		 */
+		if (!values->nr) {
+			BUG("should have at least one existing header value");
+		} else if (buf.len) {
+			char *prev = xstrdup(values->v[values->nr - 1]);
+
+			/* Join two non-empty values with a single space. */
+			const char *const sp = *prev ? " " : "";
+
+			strvec_pop(values);
+			strvec_pushf(values, "%s%s%s", prev, sp, buf.buf);
+			free(prev);
+		}
+
+		goto exit;
+	}
+
+	/* Not a continuation of a previously matched auth header line. */
+	http_auth.header_is_last_match = 0;
+
+	/*
+	 * If this is a HTTP status line and not a header field, this signals
+	 * a different HTTP response. libcurl writes all the output of all
+	 * response headers of all responses, including redirects.
+	 * We only care about the last HTTP request response's headers so clear
+	 * the existing array.
+	 */
+	if (skip_iprefix_mem(ptr, size, "http/", &val, &val_len))
+		strvec_clear(values);
+
+exit:
+	strbuf_release(&buf);
+	return size;
+}
+
 size_t fwrite_null(char *ptr, size_t eltsize, size_t nmemb, void *strbuf)
 {
 	return nmemb;
@@ -1895,6 +2005,8 @@
 					 fwrite_buffer);
 	}
 
+	curl_easy_setopt(slot->curl, CURLOPT_HEADERFUNCTION, fwrite_wwwauth);
+
 	accept_language = http_get_accept_language_header();
 
 	if (accept_language)
diff --git a/ident.c b/ident.c
index 6de76f9..8fad92d 100644
--- a/ident.c
+++ b/ident.c
@@ -5,10 +5,13 @@
  *
  * Copyright (C) 2005 Linus Torvalds
  */
-#include "cache.h"
+#include "git-compat-util.h"
+#include "ident.h"
 #include "config.h"
 #include "date.h"
+#include "gettext.h"
 #include "mailmap.h"
+#include "strbuf.h"
 
 static struct strbuf git_default_name = STRBUF_INIT;
 static struct strbuf git_default_email = STRBUF_INIT;
diff --git a/ident.h b/ident.h
new file mode 100644
index 0000000..96a6489
--- /dev/null
+++ b/ident.h
@@ -0,0 +1,67 @@
+#ifndef IDENT_H
+#define IDENT_H
+
+#include "string-list.h"
+
+struct ident_split {
+	const char *name_begin;
+	const char *name_end;
+	const char *mail_begin;
+	const char *mail_end;
+	const char *date_begin;
+	const char *date_end;
+	const char *tz_begin;
+	const char *tz_end;
+};
+
+#define IDENT_STRICT	       1
+#define IDENT_NO_DATE	       2
+#define IDENT_NO_NAME	       4
+
+enum want_ident {
+	WANT_BLANK_IDENT,
+	WANT_AUTHOR_IDENT,
+	WANT_COMMITTER_IDENT
+};
+
+const char *ident_default_name(void);
+const char *ident_default_email(void);
+/*
+ * Prepare an ident to fall back on if the user didn't configure it.
+ */
+void prepare_fallback_ident(const char *name, const char *email);
+void reset_ident_date(void);
+/*
+ * Signals an success with 0, but time part of the result may be NULL
+ * if the input lacks timestamp and zone
+ */
+int split_ident_line(struct ident_split *, const char *, int);
+
+/*
+ * Given a commit or tag object buffer and the commit or tag headers, replaces
+ * the idents in the headers with their canonical versions using the mailmap mechanism.
+ */
+void apply_mailmap_to_header(struct strbuf *, const char **, struct string_list *);
+
+/*
+ * Compare split idents for equality or strict ordering. Note that we
+ * compare only the ident part of the line, ignoring any timestamp.
+ *
+ * Because there are two fields, we must choose one as the primary key; we
+ * currently arbitrarily pick the email.
+ */
+int ident_cmp(const struct ident_split *, const struct ident_split *);
+
+const char *git_author_info(int);
+const char *git_committer_info(int);
+const char *fmt_ident(const char *name, const char *email,
+		      enum want_ident whose_ident,
+		      const char *date_str, int);
+const char *fmt_name(enum want_ident);
+
+int committer_ident_sufficiently_given(void);
+int author_ident_sufficiently_given(void);
+
+int git_ident_config(const char *, const char *, void *);
+
+#endif
diff --git a/imap-send.c b/imap-send.c
index a50af56..93e9018 100644
--- a/imap-send.c
+++ b/imap-send.c
@@ -21,7 +21,7 @@
  *  along with this program; if not, see <http://www.gnu.org/licenses/>.
  */
 
-#include "cache.h"
+#include "git-compat-util.h"
 #include "config.h"
 #include "credential.h"
 #include "exec-cmd.h"
diff --git a/json-writer.c b/json-writer.c
index f1cfd8f..005c820 100644
--- a/json-writer.c
+++ b/json-writer.c
@@ -1,4 +1,4 @@
-#include "cache.h"
+#include "git-compat-util.h"
 #include "json-writer.h"
 
 void jw_init(struct json_writer *jw)
diff --git a/khash.h b/khash.h
index cb79bf8..8536271 100644
--- a/khash.h
+++ b/khash.h
@@ -26,7 +26,6 @@
 #ifndef __AC_KHASH_H
 #define __AC_KHASH_H
 
-#include "cache.h"
 #include "hashmap.h"
 
 #define AC_VERSION_KHASH_H "0.2.8"
diff --git a/kwset.c b/kwset.c
index 08aadf0..4b14d4f 100644
--- a/kwset.c
+++ b/kwset.c
@@ -32,7 +32,7 @@
    String Matching:  An Aid to Bibliographic Search," CACM June 1975,
    Vol. 18, No. 6, which describes the failure function used below. */
 
-#include "cache.h"
+#include "git-compat-util.h"
 
 #include "kwset.h"
 #include "compat/obstack.h"
diff --git a/levenshtein.c b/levenshtein.c
index d263269..fd8026f 100644
--- a/levenshtein.c
+++ b/levenshtein.c
@@ -1,4 +1,4 @@
-#include "cache.h"
+#include "git-compat-util.h"
 #include "levenshtein.h"
 
 /*
diff --git a/line-log.c b/line-log.c
index a7f3e7f..6e7fc4b 100644
--- a/line-log.c
+++ b/line-log.c
@@ -1,6 +1,8 @@
 #include "git-compat-util.h"
+#include "alloc.h"
 #include "line-range.h"
 #include "cache.h"
+#include "hex.h"
 #include "tag.h"
 #include "blob.h"
 #include "tree.h"
@@ -1281,7 +1283,8 @@
 	return changed;
 }
 
-static enum rewrite_result line_log_rewrite_one(struct rev_info *rev, struct commit **pp)
+static enum rewrite_result line_log_rewrite_one(struct rev_info *rev UNUSED,
+						struct commit **pp)
 {
 	for (;;) {
 		struct commit *p = *pp;
diff --git a/line-log.h b/line-log.h
index 82ae8d9..adff361 100644
--- a/line-log.h
+++ b/line-log.h
@@ -5,6 +5,7 @@
 
 struct rev_info;
 struct commit;
+struct string_list;
 
 /* A range [start,end].  Lines are numbered starting at 0, and the
  * ranges include start but exclude end. */
diff --git a/linear-assignment.c b/linear-assignment.c
index ecffc09..5416cbc 100644
--- a/linear-assignment.c
+++ b/linear-assignment.c
@@ -3,7 +3,7 @@
  * algorithm for dense and sparse linear assignment problems</i>. Computing,
  * 38(4), 325-340.
  */
-#include "cache.h"
+#include "git-compat-util.h"
 #include "linear-assignment.h"
 
 #define COST(column, row) cost[(column) + column_count * (row)]
diff --git a/list-objects-filter-options.c b/list-objects-filter-options.c
index ee01bcd..1d25a57 100644
--- a/list-objects-filter-options.c
+++ b/list-objects-filter-options.c
@@ -1,6 +1,8 @@
-#include "cache.h"
+#include "git-compat-util.h"
+#include "alloc.h"
 #include "commit.h"
 #include "config.h"
+#include "gettext.h"
 #include "revision.h"
 #include "strvec.h"
 #include "list-objects.h"
diff --git a/list-objects-filter-options.h b/list-objects-filter-options.h
index 1fe393f..ef03b45 100644
--- a/list-objects-filter-options.h
+++ b/list-objects-filter-options.h
@@ -1,9 +1,10 @@
 #ifndef LIST_OBJECTS_FILTER_OPTIONS_H
 #define LIST_OBJECTS_FILTER_OPTIONS_H
 
-#include "cache.h"
+#include "object.h"
 #include "parse-options.h"
 #include "string-list.h"
+#include "strbuf.h"
 
 /*
  * The list of defined filters for list-objects.
diff --git a/list-objects-filter.c b/list-objects-filter.c
index 7ed21cb..5d7b331 100644
--- a/list-objects-filter.c
+++ b/list-objects-filter.c
@@ -1,5 +1,7 @@
 #include "cache.h"
+#include "alloc.h"
 #include "dir.h"
+#include "hex.h"
 #include "tag.h"
 #include "commit.h"
 #include "tree.h"
diff --git a/list-objects.c b/list-objects.c
index 7528fe1..ab5745b 100644
--- a/list-objects.c
+++ b/list-objects.c
@@ -1,6 +1,7 @@
 #include "cache.h"
 #include "tag.h"
 #include "commit.h"
+#include "hex.h"
 #include "tree.h"
 #include "blob.h"
 #include "diff.h"
diff --git a/log-tree.c b/log-tree.c
index 1dd5fcb..3adcb57 100644
--- a/log-tree.c
+++ b/log-tree.c
@@ -2,6 +2,7 @@
 #include "commit-reach.h"
 #include "config.h"
 #include "diff.h"
+#include "hex.h"
 #include "object-store.h"
 #include "repository.h"
 #include "tmp-objdir.h"
@@ -12,6 +13,7 @@
 #include "merge-ort.h"
 #include "reflog-walk.h"
 #include "refs.h"
+#include "replace-object.h"
 #include "string-list.h"
 #include "color.h"
 #include "gpg-interface.h"
@@ -196,7 +198,8 @@
 	return 0;
 }
 
-static int add_graft_decoration(const struct commit_graft *graft, void *cb_data)
+static int add_graft_decoration(const struct commit_graft *graft,
+				void *cb_data UNUSED)
 {
 	struct commit *commit = lookup_commit(the_repository, &graft->oid);
 	if (!commit)
diff --git a/ls-refs.c b/ls-refs.c
index 697d4be..8091b0c 100644
--- a/ls-refs.c
+++ b/ls-refs.c
@@ -1,4 +1,5 @@
 #include "cache.h"
+#include "hex.h"
 #include "repository.h"
 #include "refs.h"
 #include "remote.h"
@@ -8,38 +9,32 @@
 #include "config.h"
 #include "string-list.h"
 
-static int config_read;
-static int advertise_unborn;
-static int allow_unborn;
-
-static void ensure_config_read(void)
+static enum {
+	UNBORN_IGNORE = 0,
+	UNBORN_ALLOW,
+	UNBORN_ADVERTISE /* implies ALLOW */
+} unborn_config(struct repository *r)
 {
 	const char *str = NULL;
 
-	if (config_read)
-		return;
-
-	if (repo_config_get_string_tmp(the_repository, "lsrefs.unborn", &str)) {
+	if (repo_config_get_string_tmp(r, "lsrefs.unborn", &str)) {
 		/*
 		 * If there is no such config, advertise and allow it by
 		 * default.
 		 */
-		advertise_unborn = 1;
-		allow_unborn = 1;
+		return UNBORN_ADVERTISE;
 	} else {
 		if (!strcmp(str, "advertise")) {
-			advertise_unborn = 1;
-			allow_unborn = 1;
+			return UNBORN_ADVERTISE;
 		} else if (!strcmp(str, "allow")) {
-			allow_unborn = 1;
+			return UNBORN_ALLOW;
 		} else if (!strcmp(str, "ignore")) {
-			/* do nothing */
+			return UNBORN_IGNORE;
 		} else {
 			die(_("invalid value for '%s': '%s'"),
 			    "lsrefs.unborn", str);
 		}
 	}
-	config_read = 1;
 }
 
 /*
@@ -159,7 +154,6 @@
 	strbuf_init(&data.buf, 0);
 	string_list_init_dup(&data.hidden_refs);
 
-	ensure_config_read();
 	git_config(ls_refs_config, &data);
 
 	while (packet_reader_read(request) == PACKET_READ_NORMAL) {
@@ -175,7 +169,7 @@
 				strvec_push(&data.prefixes, out);
 		}
 		else if (!strcmp("unborn", arg))
-			data.unborn = allow_unborn;
+			data.unborn = !!unborn_config(r);
 		else
 			die(_("unexpected line: '%s'"), arg);
 	}
@@ -206,11 +200,8 @@
 
 int ls_refs_advertise(struct repository *r, struct strbuf *value)
 {
-	if (value) {
-		ensure_config_read();
-		if (advertise_unborn)
-			strbuf_addstr(value, "unborn");
-	}
+	if (value && unborn_config(r) == UNBORN_ADVERTISE)
+		strbuf_addstr(value, "unborn");
 
 	return 1;
 }
diff --git a/mailinfo.c b/mailinfo.c
index 833d286..9f1495d 100644
--- a/mailinfo.c
+++ b/mailinfo.c
@@ -1,5 +1,7 @@
-#include "cache.h"
+#include "git-compat-util.h"
 #include "config.h"
+#include "gettext.h"
+#include "hex.h"
 #include "utf8.h"
 #include "strbuf.h"
 #include "mailinfo.h"
diff --git a/match-trees.c b/match-trees.c
index 49398e5..c38dcba 100644
--- a/match-trees.c
+++ b/match-trees.c
@@ -1,4 +1,5 @@
 #include "cache.h"
+#include "hex.h"
 #include "tree.h"
 #include "tree-walk.h"
 #include "object-store.h"
diff --git a/mem-pool.c b/mem-pool.c
index 599d8e8..c34846d 100644
--- a/mem-pool.c
+++ b/mem-pool.c
@@ -2,7 +2,7 @@
  * Memory Pool implementation logic.
  */
 
-#include "cache.h"
+#include "git-compat-util.h"
 #include "mem-pool.h"
 
 #define BLOCK_GROWTH_SIZE (1024 * 1024 - sizeof(struct mp_block))
diff --git a/merge-blobs.c b/merge-blobs.c
index 8138090..aedcab8 100644
--- a/merge-blobs.c
+++ b/merge-blobs.c
@@ -1,4 +1,4 @@
-#include "cache.h"
+#include "git-compat-util.h"
 #include "run-command.h"
 #include "xdiff-interface.h"
 #include "ll-merge.h"
diff --git a/merge-ort.c b/merge-ort.c
index d1611ca..4c5be8e 100644
--- a/merge-ort.c
+++ b/merge-ort.c
@@ -26,6 +26,7 @@
 #include "diff.h"
 #include "diffcore.h"
 #include "dir.h"
+#include "hex.h"
 #include "entry.h"
 #include "ll-merge.h"
 #include "object-store.h"
diff --git a/merge-recursive.c b/merge-recursive.c
index ae469f8..89731f4 100644
--- a/merge-recursive.c
+++ b/merge-recursive.c
@@ -10,7 +10,6 @@
 #include "alloc.h"
 #include "attr.h"
 #include "blob.h"
-#include "builtin.h"
 #include "cache-tree.h"
 #include "commit.h"
 #include "commit-reach.h"
@@ -18,6 +17,7 @@
 #include "diff.h"
 #include "diffcore.h"
 #include "dir.h"
+#include "hex.h"
 #include "ll-merge.h"
 #include "lockfile.h"
 #include "object-store.h"
diff --git a/merge.c b/merge.c
index 445b4f19..2c8b845 100644
--- a/merge.c
+++ b/merge.c
@@ -1,6 +1,7 @@
 #include "cache.h"
 #include "diff.h"
 #include "diffcore.h"
+#include "hex.h"
 #include "lockfile.h"
 #include "commit.h"
 #include "run-command.h"
diff --git a/midx.c b/midx.c
index 7cfad04..47989f7 100644
--- a/midx.c
+++ b/midx.c
@@ -1,7 +1,9 @@
-#include "cache.h"
+#include "git-compat-util.h"
+#include "alloc.h"
 #include "config.h"
 #include "csum-file.h"
 #include "dir.h"
+#include "hex.h"
 #include "lockfile.h"
 #include "packfile.h"
 #include "object-store.h"
@@ -1607,7 +1609,7 @@
 	const char *ext;
 };
 
-static void clear_midx_file_ext(const char *full_path, size_t full_path_len,
+static void clear_midx_file_ext(const char *full_path, size_t full_path_len UNUSED,
 				const char *file_name, void *_data)
 {
 	struct clear_midx_data *data = _data;
diff --git a/negotiator/noop.c b/negotiator/noop.c
index 60569b8..7b72937 100644
--- a/negotiator/noop.c
+++ b/negotiator/noop.c
@@ -1,4 +1,4 @@
-#include "cache.h"
+#include "git-compat-util.h"
 #include "noop.h"
 #include "../commit.h"
 #include "../fetch-negotiator.h"
diff --git a/negotiator/skipping.c b/negotiator/skipping.c
index 0f5ac48..264acf8 100644
--- a/negotiator/skipping.c
+++ b/negotiator/skipping.c
@@ -2,6 +2,7 @@
 #include "skipping.h"
 #include "../commit.h"
 #include "../fetch-negotiator.h"
+#include "../hex.h"
 #include "../prio-queue.h"
 #include "../refs.h"
 #include "../tag.h"
@@ -50,7 +51,7 @@
 	int non_common_revs;
 };
 
-static int compare(const void *a_, const void *b_, void *unused)
+static int compare(const void *a_, const void *b_, void *data UNUSED)
 {
 	const struct entry *a = a_;
 	const struct entry *b = b_;
diff --git a/notes-merge.c b/notes-merge.c
index b4cc594..5b1a9ff 100644
--- a/notes-merge.c
+++ b/notes-merge.c
@@ -5,6 +5,7 @@
 #include "repository.h"
 #include "diff.h"
 #include "diffcore.h"
+#include "hex.h"
 #include "xdiff-interface.h"
 #include "ll-merge.h"
 #include "dir.h"
diff --git a/notes.c b/notes.c
index f2805d5..a718723 100644
--- a/notes.c
+++ b/notes.c
@@ -1,5 +1,6 @@
 #include "cache.h"
 #include "config.h"
+#include "hex.h"
 #include "notes.h"
 #include "object-store.h"
 #include "blob.h"
@@ -752,7 +753,7 @@
 	return 0;
 }
 
-static int write_each_note(const struct object_id *object_oid,
+static int write_each_note(const struct object_id *object_oid UNUSED,
 		const struct object_id *note_oid, char *note_path,
 		void *cb_data)
 {
@@ -780,8 +781,9 @@
 };
 
 static int prune_notes_helper(const struct object_id *object_oid,
-		const struct object_id *note_oid, char *note_path,
-		void *cb_data)
+			      const struct object_id *note_oid UNUSED,
+			      char *note_path UNUSED,
+			      void *cb_data)
 {
 	struct note_delete_list **l = (struct note_delete_list **) cb_data;
 	struct note_delete_list *n;
@@ -848,8 +850,8 @@
 	return 0;
 }
 
-int combine_notes_ignore(struct object_id *cur_oid,
-			 const struct object_id *new_oid)
+int combine_notes_ignore(struct object_id *cur_oid UNUSED,
+			 const struct object_id *new_oid UNUSED)
 {
 	return 0;
 }
diff --git a/object-file.c b/object-file.c
index 939865c..8fab8db 100644
--- a/object-file.c
+++ b/object-file.c
@@ -6,8 +6,10 @@
  * This handles basic git object files - packing, unpacking,
  * creation etc.
  */
-#include "cache.h"
+#include "git-compat-util.h"
+#include "alloc.h"
 #include "config.h"
+#include "hex.h"
 #include "string-list.h"
 #include "lockfile.h"
 #include "delta.h"
@@ -2644,7 +2646,8 @@
 	return 0;
 }
 
-static int append_loose_object(const struct object_id *oid, const char *path,
+static int append_loose_object(const struct object_id *oid,
+			       const char *path UNUSED,
 			       void *data)
 {
 	oidtree_insert(data, oid);
diff --git a/object-name.c b/object-name.c
index 2dd1a0f..61e8540 100644
--- a/object-name.c
+++ b/object-name.c
@@ -1,5 +1,6 @@
 #include "cache.h"
 #include "config.h"
+#include "hex.h"
 #include "tag.h"
 #include "commit.h"
 #include "tree.h"
@@ -223,7 +224,7 @@
 
 static int disambiguate_commit_only(struct repository *r,
 				    const struct object_id *oid,
-				    void *cb_data_unused)
+				    void *cb_data UNUSED)
 {
 	int kind = oid_object_info(r, oid, NULL);
 	return kind == OBJ_COMMIT;
@@ -231,7 +232,7 @@
 
 static int disambiguate_committish_only(struct repository *r,
 					const struct object_id *oid,
-					void *cb_data_unused)
+					void *cb_data UNUSED)
 {
 	struct object *obj;
 	int kind;
@@ -251,7 +252,7 @@
 
 static int disambiguate_tree_only(struct repository *r,
 				  const struct object_id *oid,
-				  void *cb_data_unused)
+				  void *cb_data UNUSED)
 {
 	int kind = oid_object_info(r, oid, NULL);
 	return kind == OBJ_TREE;
@@ -259,7 +260,7 @@
 
 static int disambiguate_treeish_only(struct repository *r,
 				     const struct object_id *oid,
-				     void *cb_data_unused)
+				     void *cb_data UNUSED)
 {
 	struct object *obj;
 	int kind;
@@ -279,7 +280,7 @@
 
 static int disambiguate_blob_only(struct repository *r,
 				  const struct object_id *oid,
-				  void *cb_data_unused)
+				  void *cb_data UNUSED)
 {
 	int kind = oid_object_info(r, oid, NULL);
 	return kind == OBJ_BLOB;
@@ -473,7 +474,7 @@
 	return 0;
 }
 
-static int repo_collect_ambiguous(struct repository *r,
+static int repo_collect_ambiguous(struct repository *r UNUSED,
 				  const struct object_id *oid,
 				  void *data)
 {
@@ -665,7 +666,7 @@
 	return 0;
 }
 
-static int repo_extend_abbrev_len(struct repository *r,
+static int repo_extend_abbrev_len(struct repository *r UNUSED,
 				  const struct object_id *oid,
 				  void *cb_data)
 {
@@ -898,6 +899,7 @@
 	char *real_ref = NULL;
 	int refs_found = 0;
 	int at, reflog_len, nth_prior = 0;
+	int fatal = !(flags & GET_OID_QUIETLY);
 
 	if (len == r->hash_algo->hexsz && !get_oid_hex(str, oid)) {
 		if (warn_ambiguous_refs && warn_on_object_refname_ambiguity) {
@@ -952,11 +954,11 @@
 
 	if (!len && reflog_len)
 		/* allow "@{...}" to mean the current branch reflog */
-		refs_found = repo_dwim_ref(r, "HEAD", 4, oid, &real_ref, 0);
+		refs_found = repo_dwim_ref(r, "HEAD", 4, oid, &real_ref, !fatal);
 	else if (reflog_len)
 		refs_found = repo_dwim_log(r, str, len, oid, &real_ref);
 	else
-		refs_found = repo_dwim_ref(r, str, len, oid, &real_ref, 0);
+		refs_found = repo_dwim_ref(r, str, len, oid, &real_ref, !fatal);
 
 	if (!refs_found)
 		return -1;
diff --git a/object-store.h b/object-store.h
index 1a713d8..82201ec 100644
--- a/object-store.h
+++ b/object-store.h
@@ -1,7 +1,7 @@
 #ifndef OBJECT_STORE_H
 #define OBJECT_STORE_H
 
-#include "cache.h"
+#include "object.h"
 #include "oidmap.h"
 #include "list.h"
 #include "oid-array.h"
@@ -284,6 +284,69 @@
 
 int force_object_loose(const struct object_id *oid, time_t mtime);
 
+struct object_info {
+	/* Request */
+	enum object_type *typep;
+	unsigned long *sizep;
+	off_t *disk_sizep;
+	struct object_id *delta_base_oid;
+	struct strbuf *type_name;
+	void **contentp;
+
+	/* Response */
+	enum {
+		OI_CACHED,
+		OI_LOOSE,
+		OI_PACKED,
+		OI_DBCACHED
+	} whence;
+	union {
+		/*
+		 * struct {
+		 * 	... Nothing to expose in this case
+		 * } cached;
+		 * struct {
+		 * 	... Nothing to expose in this case
+		 * } loose;
+		 */
+		struct {
+			struct packed_git *pack;
+			off_t offset;
+			unsigned int is_delta;
+		} packed;
+	} u;
+};
+
+/*
+ * Initializer for a "struct object_info" that wants no items. You may
+ * also memset() the memory to all-zeroes.
+ */
+#define OBJECT_INFO_INIT { 0 }
+
+/* Invoke lookup_replace_object() on the given hash */
+#define OBJECT_INFO_LOOKUP_REPLACE 1
+/* Allow reading from a loose object file of unknown/bogus type */
+#define OBJECT_INFO_ALLOW_UNKNOWN_TYPE 2
+/* Do not retry packed storage after checking packed and loose storage */
+#define OBJECT_INFO_QUICK 8
+/*
+ * Do not attempt to fetch the object if missing (even if fetch_is_missing is
+ * nonzero).
+ */
+#define OBJECT_INFO_SKIP_FETCH_OBJECT 16
+/*
+ * This is meant for bulk prefetching of missing blobs in a partial
+ * clone. Implies OBJECT_INFO_SKIP_FETCH_OBJECT and OBJECT_INFO_QUICK
+ */
+#define OBJECT_INFO_FOR_PREFETCH (OBJECT_INFO_SKIP_FETCH_OBJECT | OBJECT_INFO_QUICK)
+
+/* Die if object corruption (not just an object being missing) was detected. */
+#define OBJECT_INFO_DIE_IF_CORRUPT 32
+
+int oid_object_info_extended(struct repository *r,
+			     const struct object_id *,
+			     struct object_info *, unsigned flags);
+
 /*
  * Open the loose object at path, check its hash, and return the contents,
  * use the "oi" argument to assert things about the object, or e.g. populate its
@@ -381,69 +444,6 @@
 		pthread_mutex_unlock(&obj_read_mutex);
 }
 
-struct object_info {
-	/* Request */
-	enum object_type *typep;
-	unsigned long *sizep;
-	off_t *disk_sizep;
-	struct object_id *delta_base_oid;
-	struct strbuf *type_name;
-	void **contentp;
-
-	/* Response */
-	enum {
-		OI_CACHED,
-		OI_LOOSE,
-		OI_PACKED,
-		OI_DBCACHED
-	} whence;
-	union {
-		/*
-		 * struct {
-		 * 	... Nothing to expose in this case
-		 * } cached;
-		 * struct {
-		 * 	... Nothing to expose in this case
-		 * } loose;
-		 */
-		struct {
-			struct packed_git *pack;
-			off_t offset;
-			unsigned int is_delta;
-		} packed;
-	} u;
-};
-
-/*
- * Initializer for a "struct object_info" that wants no items. You may
- * also memset() the memory to all-zeroes.
- */
-#define OBJECT_INFO_INIT { 0 }
-
-/* Invoke lookup_replace_object() on the given hash */
-#define OBJECT_INFO_LOOKUP_REPLACE 1
-/* Allow reading from a loose object file of unknown/bogus type */
-#define OBJECT_INFO_ALLOW_UNKNOWN_TYPE 2
-/* Do not retry packed storage after checking packed and loose storage */
-#define OBJECT_INFO_QUICK 8
-/*
- * Do not attempt to fetch the object if missing (even if fetch_is_missing is
- * nonzero).
- */
-#define OBJECT_INFO_SKIP_FETCH_OBJECT 16
-/*
- * This is meant for bulk prefetching of missing blobs in a partial
- * clone. Implies OBJECT_INFO_SKIP_FETCH_OBJECT and OBJECT_INFO_QUICK
- */
-#define OBJECT_INFO_FOR_PREFETCH (OBJECT_INFO_SKIP_FETCH_OBJECT | OBJECT_INFO_QUICK)
-
-/* Die if object corruption (not just an object being missing) was detected. */
-#define OBJECT_INFO_DIE_IF_CORRUPT 32
-
-int oid_object_info_extended(struct repository *r,
-			     const struct object_id *,
-			     struct object_info *, unsigned flags);
-
 /*
  * Iterate over the files in the loose-object parts of the object
  * directory "path", triggering the following callbacks:
diff --git a/object.c b/object.c
index 344087d..609fed1 100644
--- a/object.c
+++ b/object.c
@@ -1,4 +1,5 @@
 #include "cache.h"
+#include "hex.h"
 #include "object.h"
 #include "replace-object.h"
 #include "object-store.h"
diff --git a/object.h b/object.h
index 31ebe11..fc45b15 100644
--- a/object.h
+++ b/object.h
@@ -1,7 +1,7 @@
 #ifndef OBJECT_H
 #define OBJECT_H
 
-#include "cache.h"
+#include "hash.h"
 
 struct buffer_slab;
 
@@ -81,6 +81,26 @@
  */
 #define FLAG_BITS  28
 
+#define TYPE_BITS 3
+
+/*
+ * Values in this enum (except those outside the 3 bit range) are part
+ * of pack file format. See gitformat-pack(5) for more information.
+ */
+enum object_type {
+	OBJ_BAD = -1,
+	OBJ_NONE = 0,
+	OBJ_COMMIT = 1,
+	OBJ_TREE = 2,
+	OBJ_BLOB = 3,
+	OBJ_TAG = 4,
+	/* 5 for future expansion */
+	OBJ_OFS_DELTA = 6,
+	OBJ_REF_DELTA = 7,
+	OBJ_ANY,
+	OBJ_MAX
+};
+
 /*
  * The object type is stored in 3 bits.
  */
diff --git a/oid-array.c b/oid-array.c
index 73ba76e..e8228c7 100644
--- a/oid-array.c
+++ b/oid-array.c
@@ -1,4 +1,5 @@
-#include "cache.h"
+#include "git-compat-util.h"
+#include "alloc.h"
 #include "oid-array.h"
 #include "hash-lookup.h"
 
diff --git a/oidmap.c b/oidmap.c
index 49965fe..8c1a139 100644
--- a/oidmap.c
+++ b/oidmap.c
@@ -1,4 +1,4 @@
-#include "cache.h"
+#include "git-compat-util.h"
 #include "oidmap.h"
 
 static int oidmap_neq(const void *hashmap_cmp_fn_data UNUSED,
diff --git a/oidmap.h b/oidmap.h
index c66a83a..c164292 100644
--- a/oidmap.h
+++ b/oidmap.h
@@ -1,7 +1,6 @@
 #ifndef OIDMAP_H
 #define OIDMAP_H
 
-#include "cache.h"
 #include "hashmap.h"
 
 /*
diff --git a/oidset.c b/oidset.c
index b36a2ba..d1e5376 100644
--- a/oidset.c
+++ b/oidset.c
@@ -1,5 +1,7 @@
-#include "cache.h"
+#include "git-compat-util.h"
 #include "oidset.h"
+#include "hex.h"
+#include "strbuf.h"
 
 void oidset_init(struct oidset *set, size_t initial_size)
 {
diff --git a/oidtree.c b/oidtree.c
index 0d39389..7d57b7b 100644
--- a/oidtree.c
+++ b/oidtree.c
@@ -2,6 +2,7 @@
  * A wrapper around cbtree which stores oids
  * May be used to replace oid-array for prefix (abbreviation) matches
  */
+#include "git-compat-util.h"
 #include "oidtree.h"
 #include "alloc.h"
 #include "hash.h"
diff --git a/oss-fuzz/fuzz-commit-graph.c b/oss-fuzz/fuzz-commit-graph.c
index 914026f..2992079 100644
--- a/oss-fuzz/fuzz-commit-graph.c
+++ b/oss-fuzz/fuzz-commit-graph.c
@@ -1,3 +1,4 @@
+#include "git-compat-util.h"
 #include "commit-graph.h"
 #include "repository.h"
 
diff --git a/oss-fuzz/fuzz-pack-headers.c b/oss-fuzz/fuzz-pack-headers.c
index 99da1d0..150c0f5 100644
--- a/oss-fuzz/fuzz-pack-headers.c
+++ b/oss-fuzz/fuzz-pack-headers.c
@@ -1,3 +1,4 @@
+#include "git-compat-util.h"
 #include "packfile.h"
 
 int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size);
diff --git a/oss-fuzz/fuzz-pack-idx.c b/oss-fuzz/fuzz-pack-idx.c
index 0c3d777..609a343 100644
--- a/oss-fuzz/fuzz-pack-idx.c
+++ b/oss-fuzz/fuzz-pack-idx.c
@@ -1,3 +1,4 @@
+#include "git-compat-util.h"
 #include "object-store.h"
 #include "packfile.h"
 
diff --git a/pack-bitmap-write.c b/pack-bitmap-write.c
index cfa67a5..891d9d2 100644
--- a/pack-bitmap-write.c
+++ b/pack-bitmap-write.c
@@ -1,4 +1,6 @@
-#include "cache.h"
+#include "git-compat-util.h"
+#include "alloc.h"
+#include "hex.h"
 #include "object-store.h"
 #include "commit.h"
 #include "tag.h"
diff --git a/pack-bitmap.c b/pack-bitmap.c
index d2a42ab..ca7c81b 100644
--- a/pack-bitmap.c
+++ b/pack-bitmap.c
@@ -1,5 +1,7 @@
-#include "cache.h"
+#include "git-compat-util.h"
+#include "alloc.h"
 #include "commit.h"
+#include "hex.h"
 #include "strbuf.h"
 #include "tag.h"
 #include "diff.h"
@@ -951,7 +953,8 @@
 	bitmap_set(data->base, bitmap_pos);
 }
 
-static void show_commit(struct commit *commit, void *data)
+static void show_commit(struct commit *commit UNUSED,
+			void *data UNUSED)
 {
 }
 
@@ -1940,7 +1943,8 @@
 		    type_name(bitmap_type));
 }
 
-static void test_show_object(struct object *object, const char *name,
+static void test_show_object(struct object *object,
+			     const char *name UNUSED,
 			     void *data)
 {
 	struct bitmap_test_data *tdata = data;
diff --git a/pack-check.c b/pack-check.c
index bfb593b..7ed594d 100644
--- a/pack-check.c
+++ b/pack-check.c
@@ -1,4 +1,5 @@
 #include "cache.h"
+#include "hex.h"
 #include "repository.h"
 #include "pack.h"
 #include "pack-revindex.h"
diff --git a/pack-mtimes.h b/pack-mtimes.h
index cc957b3..107327c 100644
--- a/pack-mtimes.h
+++ b/pack-mtimes.h
@@ -1,8 +1,6 @@
 #ifndef PACK_MTIMES_H
 #define PACK_MTIMES_H
 
-#include "git-compat-util.h"
-
 #define MTIMES_SIGNATURE 0x4d544d45 /* "MTME" */
 #define MTIMES_VERSION 1
 
diff --git a/pack-objects.c b/pack-objects.c
index 272e8d4..ccab09f 100644
--- a/pack-objects.c
+++ b/pack-objects.c
@@ -1,4 +1,5 @@
-#include "cache.h"
+#include "git-compat-util.h"
+#include "alloc.h"
 #include "object.h"
 #include "pack.h"
 #include "pack-objects.h"
diff --git a/pack-write.c b/pack-write.c
index 3363729..041e573 100644
--- a/pack-write.c
+++ b/pack-write.c
@@ -1,4 +1,5 @@
 #include "cache.h"
+#include "hex.h"
 #include "pack.h"
 #include "csum-file.h"
 #include "remote.h"
diff --git a/packfile.c b/packfile.c
index 79e21ab..2023df1 100644
--- a/packfile.c
+++ b/packfile.c
@@ -1,4 +1,6 @@
-#include "cache.h"
+#include "git-compat-util.h"
+#include "alloc.h"
+#include "hex.h"
 #include "list.h"
 #include "pack.h"
 #include "repository.h"
@@ -1008,6 +1010,16 @@
 	struct object_directory *odb;
 
 	obj_read_lock();
+
+	/*
+	 * Reprepare alt odbs, in case the alternates file was modified
+	 * during the course of this process. This only _adds_ odbs to
+	 * the linked list, so existing odbs will continue to exist for
+	 * the lifetime of the process.
+	 */
+	r->objects->loaded_alternates = 0;
+	prepare_alt_odb(r);
+
 	for (odb = r->objects->odb; odb; odb = odb->next)
 		odb_clear_loose_cache(odb);
 
@@ -2204,8 +2216,8 @@
 }
 
 static int add_promisor_object(const struct object_id *oid,
-			       struct packed_git *pack,
-			       uint32_t pos,
+			       struct packed_git *pack UNUSED,
+			       uint32_t pos UNUSED,
 			       void *set_)
 {
 	struct oidset *set = set_;
diff --git a/parallel-checkout.c b/parallel-checkout.c
index 4f6819f..2455aa3 100644
--- a/parallel-checkout.c
+++ b/parallel-checkout.c
@@ -1,6 +1,8 @@
 #include "cache.h"
+#include "alloc.h"
 #include "config.h"
 #include "entry.h"
+#include "hex.h"
 #include "parallel-checkout.h"
 #include "pkt-line.h"
 #include "progress.h"
diff --git a/parse-options.c b/parse-options.c
index fd47432..6dd4c09 100644
--- a/parse-options.c
+++ b/parse-options.c
@@ -59,12 +59,12 @@
 	return 0;
 }
 
-static void fix_filename(const char *prefix, const char **file)
+static void fix_filename(const char *prefix, char **file)
 {
-	if (!file || !*file || !prefix || is_absolute_path(*file)
-	    || !strcmp("-", *file))
-		return;
-	*file = prefix_filename(prefix, *file);
+	if (!file || !*file)
+		; /* leave as NULL */
+	else
+		*file = prefix_filename_except_for_dash(prefix, *file);
 }
 
 static enum parse_opt_result opt_command_mode_error(
@@ -177,7 +177,7 @@
 			err = get_arg(p, opt, flags, (const char **)opt->value);
 
 		if (!err)
-			fix_filename(p->prefix, (const char **)opt->value);
+			fix_filename(p->prefix, (char **)opt->value);
 		return err;
 
 	case OPTION_CALLBACK:
diff --git a/patch-ids.c b/patch-ids.c
index 3153446..a4473a8 100644
--- a/patch-ids.c
+++ b/patch-ids.c
@@ -2,6 +2,7 @@
 #include "diff.h"
 #include "commit.h"
 #include "hash-lookup.h"
+#include "hex.h"
 #include "patch-ids.h"
 
 static int patch_id_defined(struct commit *commit)
diff --git a/path.c b/path.c
index 492e17a..632a051 100644
--- a/path.c
+++ b/path.c
@@ -2,6 +2,7 @@
  * Utilities for paths and pathnames
  */
 #include "cache.h"
+#include "hex.h"
 #include "repository.h"
 #include "strbuf.h"
 #include "string-list.h"
@@ -347,7 +348,8 @@
  * Helper function for update_common_dir: returns 1 if the dir
  * prefix is common.
  */
-static int check_common(const char *unmatched, void *value, void *baton)
+static int check_common(const char *unmatched, void *value,
+			void *baton UNUSED)
 {
 	struct common_dir *dir = value;
 
diff --git a/pathspec.h b/pathspec.h
index 41f6adf..a5b38e0 100644
--- a/pathspec.h
+++ b/pathspec.h
@@ -171,6 +171,11 @@
 			 const char *name, int namelen,
 			 const struct pathspec_item *item);
 
+int match_pathspec(struct index_state *istate,
+		   const struct pathspec *pathspec,
+		   const char *name, int namelen,
+		   int prefix, char *seen, int is_dir);
+
 /*
  * Determine whether a pathspec will match only entire index entries (non-sparse
  * files and/or entire sparse directories). If the pathspec has the potential to
diff --git a/pkt-line.c b/pkt-line.c
index ce4e73b..1ea7f86 100644
--- a/pkt-line.c
+++ b/pkt-line.c
@@ -1,5 +1,6 @@
 #include "cache.h"
 #include "pkt-line.h"
+#include "hex.h"
 #include "run-command.h"
 
 char packet_buffer[LARGE_PACKET_MAX];
diff --git a/pkt-line.h b/pkt-line.h
index 79c538b..8e9846f 100644
--- a/pkt-line.h
+++ b/pkt-line.h
@@ -1,7 +1,6 @@
 #ifndef PKTLINE_H
 #define PKTLINE_H
 
-#include "git-compat-util.h"
 #include "strbuf.h"
 #include "sideband.h"
 
diff --git a/pretty.c b/pretty.c
index 1e1e218..05b557d 100644
--- a/pretty.c
+++ b/pretty.c
@@ -1,6 +1,8 @@
 #include "cache.h"
+#include "alloc.h"
 #include "config.h"
 #include "commit.h"
+#include "hex.h"
 #include "utf8.h"
 #include "diff.h"
 #include "revision.h"
@@ -1857,7 +1859,8 @@
 	return consumed + 1;
 }
 
-static size_t userformat_want_item(struct strbuf *sb, const char *placeholder,
+static size_t userformat_want_item(struct strbuf *sb UNUSED,
+				   const char *placeholder,
 				   void *context)
 {
 	struct userformat_want *w = context;
diff --git a/pretty.h b/pretty.h
index f34e24c..921dd6e 100644
--- a/pretty.h
+++ b/pretty.h
@@ -1,11 +1,11 @@
 #ifndef PRETTY_H
 #define PRETTY_H
 
-#include "cache.h"
 #include "date.h"
 #include "string-list.h"
 
 struct commit;
+struct repository;
 struct strbuf;
 struct process_trailer_options;
 
@@ -153,6 +153,8 @@
 /* Make subject of commit message suitable for filename */
 void format_sanitized_subject(struct strbuf *sb, const char *msg, size_t len);
 
+int has_non_ascii(const char *text);
+
 /*
  * Set values of fields in "struct process_trailer_options"
  * according to trailers arguments.
diff --git a/prio-queue.c b/prio-queue.c
index d31b48e..dc2476b 100644
--- a/prio-queue.c
+++ b/prio-queue.c
@@ -1,4 +1,5 @@
-#include "cache.h"
+#include "git-compat-util.h"
+#include "alloc.h"
 #include "prio-queue.h"
 
 static inline int compare(struct prio_queue *queue, int i, int j)
diff --git a/progress.c b/progress.c
index 0cdd875..9b33a2d 100644
--- a/progress.c
+++ b/progress.c
@@ -59,7 +59,7 @@
 }
 
 
-static void progress_interval(int signum)
+static void progress_interval(int signum UNUSED)
 {
 	progress_update = 1;
 }
diff --git a/promisor-remote.c b/promisor-remote.c
index faa7612..1db5669 100644
--- a/promisor-remote.c
+++ b/promisor-remote.c
@@ -1,4 +1,5 @@
 #include "cache.h"
+#include "hex.h"
 #include "object-store.h"
 #include "promisor-remote.h"
 #include "config.h"
diff --git a/protocol-caps.c b/protocol-caps.c
index bbde918..874bc81 100644
--- a/protocol-caps.c
+++ b/protocol-caps.c
@@ -1,9 +1,11 @@
 #include "git-compat-util.h"
 #include "protocol-caps.h"
 #include "gettext.h"
+#include "hex.h"
 #include "pkt-line.h"
 #include "strvec.h"
 #include "hash.h"
+#include "hex.h"
 #include "object.h"
 #include "object-store.h"
 #include "string-list.h"
diff --git a/prune-packed.c b/prune-packed.c
index 261520b..d2813f6 100644
--- a/prune-packed.c
+++ b/prune-packed.c
@@ -1,3 +1,4 @@
+#include "git-compat-util.h"
 #include "object-store.h"
 #include "packfile.h"
 #include "progress.h"
diff --git a/quote.c b/quote.c
index 26719d2..7ccb5a0 100644
--- a/quote.c
+++ b/quote.c
@@ -1,5 +1,7 @@
 #include "cache.h"
+#include "alloc.h"
 #include "quote.h"
+#include "strbuf.h"
 #include "strvec.h"
 
 int quote_path_fully = 1;
diff --git a/reachable.c b/reachable.c
index aba63eb..c9dab2a 100644
--- a/reachable.c
+++ b/reachable.c
@@ -1,4 +1,5 @@
 #include "cache.h"
+#include "hex.h"
 #include "refs.h"
 #include "tag.h"
 #include "commit.h"
@@ -48,7 +49,9 @@
  * The traversal will have already marked us as SEEN, so we
  * only need to handle any progress reporting here.
  */
-static void mark_object(struct object *obj, const char *name, void *data)
+static void mark_object(struct object *obj UNUSED,
+			const char *name UNUSED,
+			void *data)
 {
 	update_progress(data);
 }
@@ -152,7 +155,8 @@
 }
 
 static int add_recent_packed(const struct object_id *oid,
-			     struct packed_git *p, uint32_t pos,
+			     struct packed_git *p,
+			     uint32_t pos,
 			     void *data)
 {
 	struct object *obj;
@@ -202,10 +206,10 @@
 
 static int mark_object_seen(const struct object_id *oid,
 			     enum object_type type,
-			     int exclude,
-			     uint32_t name_hash,
-			     struct packed_git *found_pack,
-			     off_t found_offset)
+			     int exclude UNUSED,
+			     uint32_t name_hash UNUSED,
+			     struct packed_git *found_pack UNUSED,
+			     off_t found_offset UNUSED)
 {
 	struct object *obj = lookup_object_by_type(the_repository, oid, type);
 	if (!obj)
diff --git a/read-cache.c b/read-cache.c
index 35e5657..1bcf673 100644
--- a/read-cache.c
+++ b/read-cache.c
@@ -4,9 +4,11 @@
  * Copyright (C) Linus Torvalds, 2005
  */
 #include "cache.h"
+#include "alloc.h"
 #include "config.h"
 #include "diff.h"
 #include "diffcore.h"
+#include "hex.h"
 #include "tempfile.h"
 #include "lockfile.h"
 #include "cache-tree.h"
diff --git a/rebase.c b/rebase.c
index 6775cdd..17a570f 100644
--- a/rebase.c
+++ b/rebase.c
@@ -1,3 +1,4 @@
+#include "git-compat-util.h"
 #include "rebase.h"
 #include "config.h"
 #include "gettext.h"
diff --git a/ref-filter.c b/ref-filter.c
index f8203c6..ed80277 100644
--- a/ref-filter.c
+++ b/ref-filter.c
@@ -1,5 +1,6 @@
-#include "builtin.h"
-#include "cache.h"
+#include "git-compat-util.h"
+#include "alloc.h"
+#include "hex.h"
 #include "parse-options.h"
 #include "refs.h"
 #include "wildmatch.h"
@@ -13,7 +14,6 @@
 #include "ref-filter.h"
 #include "revision.h"
 #include "utf8.h"
-#include "git-compat-util.h"
 #include "version.h"
 #include "trailer.h"
 #include "wt-status.h"
@@ -282,7 +282,8 @@
 	return 0;
 }
 
-static int remote_ref_atom_parser(struct ref_format *format, struct used_atom *atom,
+static int remote_ref_atom_parser(struct ref_format *format UNUSED,
+				  struct used_atom *atom,
 				  const char *arg, struct strbuf *err)
 {
 	struct string_list params = STRING_LIST_INIT_DUP;
@@ -329,7 +330,8 @@
 	return 0;
 }
 
-static int objecttype_atom_parser(struct ref_format *format, struct used_atom *atom,
+static int objecttype_atom_parser(struct ref_format *format UNUSED,
+				  struct used_atom *atom,
 				  const char *arg, struct strbuf *err)
 {
 	if (arg)
@@ -341,7 +343,8 @@
 	return 0;
 }
 
-static int objectsize_atom_parser(struct ref_format *format, struct used_atom *atom,
+static int objectsize_atom_parser(struct ref_format *format UNUSED,
+				  struct used_atom *atom,
 				  const char *arg, struct strbuf *err)
 {
 	if (!arg) {
@@ -361,7 +364,8 @@
 	return 0;
 }
 
-static int deltabase_atom_parser(struct ref_format *format, struct used_atom *atom,
+static int deltabase_atom_parser(struct ref_format *format UNUSED,
+				 struct used_atom *atom,
 				 const char *arg, struct strbuf *err)
 {
 	if (arg)
@@ -373,7 +377,8 @@
 	return 0;
 }
 
-static int body_atom_parser(struct ref_format *format, struct used_atom *atom,
+static int body_atom_parser(struct ref_format *format UNUSED,
+			    struct used_atom *atom,
 			    const char *arg, struct strbuf *err)
 {
 	if (arg)
@@ -382,7 +387,8 @@
 	return 0;
 }
 
-static int subject_atom_parser(struct ref_format *format, struct used_atom *atom,
+static int subject_atom_parser(struct ref_format *format UNUSED,
+			       struct used_atom *atom,
 			       const char *arg, struct strbuf *err)
 {
 	if (!arg)
@@ -394,7 +400,8 @@
 	return 0;
 }
 
-static int trailers_atom_parser(struct ref_format *format, struct used_atom *atom,
+static int trailers_atom_parser(struct ref_format *format UNUSED,
+				struct used_atom *atom,
 				const char *arg, struct strbuf *err)
 {
 	atom->u.contents.trailer_opts.no_divider = 1;
@@ -448,8 +455,9 @@
 	return 0;
 }
 
-static int raw_atom_parser(struct ref_format *format, struct used_atom *atom,
-				const char *arg, struct strbuf *err)
+static int raw_atom_parser(struct ref_format *format UNUSED,
+			   struct used_atom *atom,
+			   const char *arg, struct strbuf *err)
 {
 	if (!arg)
 		atom->u.raw_data.option = RAW_BARE;
@@ -460,7 +468,8 @@
 	return 0;
 }
 
-static int oid_atom_parser(struct ref_format *format, struct used_atom *atom,
+static int oid_atom_parser(struct ref_format *format UNUSED,
+			   struct used_atom *atom,
 			   const char *arg, struct strbuf *err)
 {
 	if (!arg)
@@ -479,7 +488,8 @@
 	return 0;
 }
 
-static int person_email_atom_parser(struct ref_format *format, struct used_atom *atom,
+static int person_email_atom_parser(struct ref_format *format UNUSED,
+				    struct used_atom *atom,
 				    const char *arg, struct strbuf *err)
 {
 	if (!arg)
@@ -493,7 +503,8 @@
 	return 0;
 }
 
-static int refname_atom_parser(struct ref_format *format, struct used_atom *atom,
+static int refname_atom_parser(struct ref_format *format UNUSED,
+			       struct used_atom *atom,
 			       const char *arg, struct strbuf *err)
 {
 	return refname_atom_parser_internal(&atom->u.refname, arg, atom->name, err);
@@ -510,7 +521,8 @@
 	return -1;
 }
 
-static int align_atom_parser(struct ref_format *format, struct used_atom *atom,
+static int align_atom_parser(struct ref_format *format UNUSED,
+			     struct used_atom *atom,
 			     const char *arg, struct strbuf *err)
 {
 	struct align *align = &atom->u.align;
@@ -562,7 +574,8 @@
 	return 0;
 }
 
-static int if_atom_parser(struct ref_format *format, struct used_atom *atom,
+static int if_atom_parser(struct ref_format *format UNUSED,
+			  struct used_atom *atom,
 			  const char *arg, struct strbuf *err)
 {
 	if (!arg) {
@@ -577,7 +590,8 @@
 	return 0;
 }
 
-static int rest_atom_parser(struct ref_format *format, struct used_atom *atom,
+static int rest_atom_parser(struct ref_format *format,
+			    struct used_atom *atom UNUSED,
 			    const char *arg, struct strbuf *err)
 {
 	if (arg)
@@ -586,7 +600,8 @@
 	return 0;
 }
 
-static int head_atom_parser(struct ref_format *format, struct used_atom *atom,
+static int head_atom_parser(struct ref_format *format UNUSED,
+			    struct used_atom *atom,
 			    const char *arg, struct strbuf *err)
 {
 	if (arg)
@@ -791,7 +806,7 @@
 }
 
 static int append_atom(struct atom_value *v, struct ref_formatting_state *state,
-		       struct strbuf *unused_err)
+		       struct strbuf *err UNUSED)
 {
 	/*
 	 * Quote formatting is only done when the stack has a single
@@ -841,7 +856,7 @@
 }
 
 static int align_atom_handler(struct atom_value *atomv, struct ref_formatting_state *state,
-			      struct strbuf *unused_err)
+			      struct strbuf *err UNUSED)
 {
 	struct ref_formatting_stack *new_stack;
 
@@ -888,7 +903,7 @@
 }
 
 static int if_atom_handler(struct atom_value *atomv, struct ref_formatting_state *state,
-			   struct strbuf *unused_err)
+			   struct strbuf *err UNUSED)
 {
 	struct ref_formatting_stack *new_stack;
 	struct if_then_else *if_then_else = xcalloc(1,
@@ -915,7 +930,8 @@
 	return cur == end;
  }
 
-static int then_atom_handler(struct atom_value *atomv, struct ref_formatting_state *state,
+static int then_atom_handler(struct atom_value *atomv UNUSED,
+			     struct ref_formatting_state *state,
 			     struct strbuf *err)
 {
 	struct ref_formatting_stack *cur = state->stack;
@@ -952,7 +968,8 @@
 	return 0;
 }
 
-static int else_atom_handler(struct atom_value *atomv, struct ref_formatting_state *state,
+static int else_atom_handler(struct atom_value *atomv UNUSED,
+			     struct ref_formatting_state *state,
 			     struct strbuf *err)
 {
 	struct ref_formatting_stack *prev = state->stack;
@@ -973,7 +990,8 @@
 	return 0;
 }
 
-static int end_atom_handler(struct atom_value *atomv, struct ref_formatting_state *state,
+static int end_atom_handler(struct atom_value *atomv UNUSED,
+			    struct ref_formatting_state *state,
 			    struct strbuf *err)
 {
 	struct ref_formatting_stack *current = state->stack;
@@ -1822,7 +1840,7 @@
 	populate_worktree_map(&(ref_to_worktree_map.map), ref_to_worktree_map.worktrees);
 }
 
-static char *get_worktree_path(const struct used_atom *atom, const struct ref_array_item *ref)
+static char *get_worktree_path(const struct ref_array_item *ref)
 {
 	struct hashmap_entry entry, *e;
 	struct ref_to_worktree_entry *lookup_result;
@@ -1881,7 +1899,7 @@
 			refname = get_refname(atom, ref);
 		else if (atom_type == ATOM_WORKTREEPATH) {
 			if (ref->kind == FILTER_REFS_BRANCHES)
-				v->s = get_worktree_path(atom, ref);
+				v->s = get_worktree_path(ref);
 			else
 				v->s = xstrdup("");
 			continue;
diff --git a/reflog-walk.c b/reflog-walk.c
index 8a4d8fa..4ba1a10 100644
--- a/reflog-walk.c
+++ b/reflog-walk.c
@@ -1,4 +1,5 @@
-#include "cache.h"
+#include "git-compat-util.h"
+#include "alloc.h"
 #include "commit.h"
 #include "refs.h"
 #include "diff.h"
diff --git a/reflog-walk.h b/reflog-walk.h
index 8076f10..4d93a26 100644
--- a/reflog-walk.h
+++ b/reflog-walk.h
@@ -1,8 +1,6 @@
 #ifndef REFLOG_WALK_H
 #define REFLOG_WALK_H
 
-#include "cache.h"
-
 struct commit;
 struct reflog_walk_info;
 struct date_mode;
diff --git a/refs.c b/refs.c
index aeae31c..53240bc 100644
--- a/refs.c
+++ b/refs.c
@@ -2,9 +2,11 @@
  * The backend-independent part of the reference module.
  */
 
-#include "cache.h"
+#include "git-compat-util.h"
+#include "alloc.h"
 #include "config.h"
 #include "hashmap.h"
+#include "hex.h"
 #include "lockfile.h"
 #include "iterator.h"
 #include "refs.h"
diff --git a/refs/debug.c b/refs/debug.c
index eed8bc9..adc34c8 100644
--- a/refs/debug.c
+++ b/refs/debug.c
@@ -1,4 +1,5 @@
-
+#include "git-compat-util.h"
+#include "hex.h"
 #include "refs-internal.h"
 #include "trace.h"
 
diff --git a/refs/files-backend.c b/refs/files-backend.c
index b899543..31bc5c4 100644
--- a/refs/files-backend.c
+++ b/refs/files-backend.c
@@ -1,9 +1,11 @@
 #include "../cache.h"
 #include "../config.h"
+#include "../hex.h"
 #include "../refs.h"
 #include "refs-internal.h"
 #include "ref-cache.h"
 #include "packed-backend.h"
+#include "../ident.h"
 #include "../iterator.h"
 #include "../dir-iterator.h"
 #include "../lockfile.h"
diff --git a/refs/packed-backend.c b/refs/packed-backend.c
index 6f5a070..b665d0f 100644
--- a/refs/packed-backend.c
+++ b/refs/packed-backend.c
@@ -1,5 +1,7 @@
-#include "../cache.h"
+#include "../git-compat-util.h"
+#include "../alloc.h"
 #include "../config.h"
+#include "../hex.h"
 #include "../refs.h"
 #include "refs-internal.h"
 #include "packed-backend.h"
diff --git a/refs/ref-cache.c b/refs/ref-cache.c
index 32afd8a..dc1ca49 100644
--- a/refs/ref-cache.c
+++ b/refs/ref-cache.c
@@ -1,4 +1,5 @@
-#include "../cache.h"
+#include "../git-compat-util.h"
+#include "../alloc.h"
 #include "../refs.h"
 #include "refs-internal.h"
 #include "ref-cache.h"
diff --git a/refs/refs-internal.h b/refs/refs-internal.h
index 69f93b0..a85d113 100644
--- a/refs/refs-internal.h
+++ b/refs/refs-internal.h
@@ -1,7 +1,6 @@
 #ifndef REFS_REFS_INTERNAL_H
 #define REFS_REFS_INTERNAL_H
 
-#include "cache.h"
 #include "refs.h"
 #include "iterator.h"
 
diff --git a/refspec.c b/refspec.c
index 63e3112..28d9091 100644
--- a/refspec.c
+++ b/refspec.c
@@ -1,4 +1,6 @@
-#include "cache.h"
+#include "git-compat-util.h"
+#include "alloc.h"
+#include "hex.h"
 #include "strvec.h"
 #include "refs.h"
 #include "refspec.h"
diff --git a/remote-curl.c b/remote-curl.c
index a76b640..bf5a0b1 100644
--- a/remote-curl.c
+++ b/remote-curl.c
@@ -1,5 +1,7 @@
-#include "cache.h"
+#include "git-compat-util.h"
+#include "alloc.h"
 #include "config.h"
+#include "hex.h"
 #include "remote.h"
 #include "connect.h"
 #include "strbuf.h"
@@ -472,10 +474,11 @@
 
 	/*
 	 * NEEDSWORK: If we are trying to use protocol v2 and we are planning
-	 * to perform a push, then fallback to v0 since the client doesn't know
-	 * how to push yet using v2.
+	 * to perform any operation that doesn't involve upload-pack (i.e., a
+	 * fetch, ls-remote, etc), then fallback to v0 since we don't know how
+	 * to do anything else (like push or remote archive) via v2.
 	 */
-	if (version == protocol_v2 && !strcmp("git-receive-pack", service))
+	if (version == protocol_v2 && strcmp("git-upload-pack", service))
 		version = protocol_v0;
 
 	/* Add the extra Git-Protocol header */
diff --git a/remote.c b/remote.c
index 60869be..b04e5da 100644
--- a/remote.c
+++ b/remote.c
@@ -1,5 +1,7 @@
-#include "cache.h"
+#include "git-compat-util.h"
+#include "alloc.h"
 #include "config.h"
+#include "hex.h"
 #include "remote.h"
 #include "urlmatch.h"
 #include "refs.h"
diff --git a/remote.h b/remote.h
index 1ebbe42..5b38ee2 100644
--- a/remote.h
+++ b/remote.h
@@ -1,7 +1,6 @@
 #ifndef REMOTE_H
 #define REMOTE_H
 
-#include "cache.h"
 #include "parse-options.h"
 #include "hashmap.h"
 #include "refspec.h"
diff --git a/replace-object.c b/replace-object.c
index 320be25..0cf056c 100644
--- a/replace-object.c
+++ b/replace-object.c
@@ -1,4 +1,5 @@
 #include "cache.h"
+#include "hex.h"
 #include "oidmap.h"
 #include "object-store.h"
 #include "replace-object.h"
diff --git a/replace-object.h b/replace-object.h
index 3fbc32e..500482b 100644
--- a/replace-object.h
+++ b/replace-object.h
@@ -5,6 +5,14 @@
 #include "repository.h"
 #include "object-store.h"
 
+/*
+ * Do replace refs need to be checked this run?  This variable is
+ * initialized to true unless --no-replace-object is used or
+ * $GIT_NO_REPLACE_OBJECTS is set, but is set to false by some
+ * commands that do not want replace references to be active.
+ */
+extern int read_replace_refs;
+
 struct replace_object {
 	struct oidmap_entry original;
 	struct object_id replacement;
diff --git a/repo-settings.c b/repo-settings.c
index 3dbd3f0..0a6c0b3 100644
--- a/repo-settings.c
+++ b/repo-settings.c
@@ -1,4 +1,4 @@
-#include "cache.h"
+#include "git-compat-util.h"
 #include "config.h"
 #include "repository.h"
 #include "midx.h"
diff --git a/repository.h b/repository.h
index e8c67ff..15a8afc 100644
--- a/repository.h
+++ b/repository.h
@@ -1,7 +1,6 @@
 #ifndef REPOSITORY_H
 #define REPOSITORY_H
 
-#include "git-compat-util.h"
 #include "path.h"
 
 struct config_set;
diff --git a/rerere.c b/rerere.c
index 876ab43..a67abaa 100644
--- a/rerere.c
+++ b/rerere.c
@@ -1,5 +1,7 @@
-#include "cache.h"
+#include "git-compat-util.h"
+#include "alloc.h"
 #include "config.h"
+#include "hex.h"
 #include "lockfile.h"
 #include "string-list.h"
 #include "rerere.h"
diff --git a/reset.c b/reset.c
index 5ded236..58b3829 100644
--- a/reset.c
+++ b/reset.c
@@ -1,5 +1,6 @@
 #include "git-compat-util.h"
 #include "cache-tree.h"
+#include "hex.h"
 #include "lockfile.h"
 #include "refs.h"
 #include "reset.h"
diff --git a/revision.c b/revision.c
index 21f5f57..e4c066e 100644
--- a/revision.c
+++ b/revision.c
@@ -1,5 +1,7 @@
-#include "cache.h"
+#include "git-compat-util.h"
+#include "alloc.h"
 #include "config.h"
+#include "hex.h"
 #include "object-store.h"
 #include "tag.h"
 #include "blob.h"
@@ -1574,7 +1576,8 @@
 {
 	struct exclude_hidden_refs_cb cb;
 
-	if (strcmp(section, "receive") && strcmp(section, "uploadpack"))
+	if (strcmp(section, "fetch") && strcmp(section, "receive") &&
+			strcmp(section, "uploadpack"))
 		die(_("unsupported section for hidden refs: %s"), section);
 
 	if (exclusions->hidden_refs_configured)
@@ -3440,8 +3443,8 @@
 }
 
 static int mark_uninteresting(const struct object_id *oid,
-			      struct packed_git *pack,
-			      uint32_t pos,
+			      struct packed_git *pack UNUSED,
+			      uint32_t pos UNUSED,
 			      void *cb)
 {
 	struct rev_info *revs = cb;
@@ -4159,7 +4162,7 @@
  * Return true for entries that have not yet been shown.  (This is an
  * object_array_each_func_t.)
  */
-static int entry_unshown(struct object_array_entry *entry, void *cb_data_unused)
+static int entry_unshown(struct object_array_entry *entry, void *cb_data UNUSED)
 {
 	return !(entry->item->flags & SHOWN);
 }
diff --git a/revision.h b/revision.h
index 30febad..ab71443 100644
--- a/revision.h
+++ b/revision.h
@@ -8,6 +8,7 @@
 #include "pretty.h"
 #include "diff.h"
 #include "commit-slab-decl.h"
+#include "ident.h"
 #include "list-objects-filter-options.h"
 
 /**
diff --git a/run-command.c b/run-command.c
index 6bd16ac..ba61765 100644
--- a/run-command.c
+++ b/run-command.c
@@ -341,19 +341,19 @@
 	child_close(fd[1]);
 }
 
-static void child_error_fn(const char *err, va_list params)
+static void child_error_fn(const char *err UNUSED, va_list params UNUSED)
 {
 	const char msg[] = "error() should not be called in child\n";
 	xwrite(2, msg, sizeof(msg) - 1);
 }
 
-static void child_warn_fn(const char *err, va_list params)
+static void child_warn_fn(const char *err UNUSED, va_list params UNUSED)
 {
 	const char msg[] = "warn() should not be called in child\n";
 	xwrite(2, msg, sizeof(msg) - 1);
 }
 
-static void NORETURN child_die_fn(const char *err, va_list params)
+static void NORETURN child_die_fn(const char *err UNUSED, va_list params UNUSED)
 {
 	const char msg[] = "die() should not be called in child\n";
 	xwrite(2, msg, sizeof(msg) - 1);
diff --git a/send-pack.c b/send-pack.c
index f2e1983..423a5cf 100644
--- a/send-pack.c
+++ b/send-pack.c
@@ -1,6 +1,7 @@
-#include "builtin.h"
+#include "git-compat-util.h"
 #include "config.h"
 #include "commit.h"
+#include "hex.h"
 #include "refs.h"
 #include "object-store.h"
 #include "pkt-line.h"
diff --git a/sequencer.c b/sequencer.c
index 1c96a75..3be23d7 100644
--- a/sequencer.c
+++ b/sequencer.c
@@ -1,5 +1,7 @@
 #include "cache.h"
+#include "alloc.h"
 #include "config.h"
+#include "hex.h"
 #include "lockfile.h"
 #include "dir.h"
 #include "object-store.h"
@@ -263,10 +265,6 @@
 	if (opts->action == REPLAY_REVERT && !strcmp(k, "revert.reference"))
 		opts->commit_use_reference = git_config_bool(k, v);
 
-	status = git_gpg_config(k, v, NULL);
-	if (status)
-		return status;
-
 	return git_diff_basic_config(k, v, NULL);
 }
 
@@ -2921,13 +2919,18 @@
 void parse_strategy_opts(struct replay_opts *opts, char *raw_opts)
 {
 	int i;
+	int count;
 	char *strategy_opts_string = raw_opts;
 
 	if (*strategy_opts_string == ' ')
 		strategy_opts_string++;
 
-	opts->xopts_nr = split_cmdline(strategy_opts_string,
-				       (const char ***)&opts->xopts);
+	count = split_cmdline(strategy_opts_string,
+			      (const char ***)&opts->xopts);
+	if (count < 0)
+		die(_("could not split '%s': %s"), strategy_opts_string,
+			    split_cmdline_strerror(count));
+	opts->xopts_nr = count;
 	for (i = 0; i < opts->xopts_nr; i++) {
 		const char *arg = opts->xopts[i];
 
diff --git a/sequencer.h b/sequencer.h
index 3bcdfa1..33dbaf5 100644
--- a/sequencer.h
+++ b/sequencer.h
@@ -1,11 +1,11 @@
 #ifndef SEQUENCER_H
 #define SEQUENCER_H
 
-#include "cache.h"
 #include "strbuf.h"
 #include "wt-status.h"
 
 struct commit;
+struct index_state;
 struct repository;
 
 const char *git_path_commit_editmsg(void);
diff --git a/serve.c b/serve.c
index cbf4a14..5329c91 100644
--- a/serve.c
+++ b/serve.c
@@ -1,4 +1,4 @@
-#include "cache.h"
+#include "git-compat-util.h"
 #include "repository.h"
 #include "config.h"
 #include "pkt-line.h"
@@ -8,17 +8,18 @@
 #include "serve.h"
 #include "upload-pack.h"
 #include "bundle-uri.h"
+#include "trace2.h"
 
 static int advertise_sid = -1;
 static int client_hash_algo = GIT_HASH_SHA1;
 
-static int always_advertise(struct repository *r,
-			    struct strbuf *value)
+static int always_advertise(struct repository *r UNUSED,
+			    struct strbuf *value UNUSED)
 {
 	return 1;
 }
 
-static int agent_advertise(struct repository *r,
+static int agent_advertise(struct repository *r UNUSED,
 			   struct strbuf *value)
 {
 	if (value)
@@ -34,7 +35,7 @@
 	return 1;
 }
 
-static void object_format_receive(struct repository *r,
+static void object_format_receive(struct repository *r UNUSED,
 				  const char *algo_name)
 {
 	if (!algo_name)
@@ -48,7 +49,7 @@
 static int session_id_advertise(struct repository *r, struct strbuf *value)
 {
 	if (advertise_sid == -1 &&
-	    git_config_get_bool("transfer.advertisesid", &advertise_sid))
+	    repo_config_get_bool(r, "transfer.advertisesid", &advertise_sid))
 		advertise_sid = 0;
 	if (!advertise_sid)
 		return 0;
@@ -57,7 +58,7 @@
 	return 1;
 }
 
-static void session_id_receive(struct repository *r,
+static void session_id_receive(struct repository *r UNUSED,
 			       const char *client_sid)
 {
 	if (!client_sid)
diff --git a/server-info.c b/server-info.c
index 0ec6c0c..4043689 100644
--- a/server-info.c
+++ b/server-info.c
@@ -1,5 +1,7 @@
-#include "cache.h"
+#include "git-compat-util.h"
+#include "alloc.h"
 #include "dir.h"
+#include "hex.h"
 #include "repository.h"
 #include "refs.h"
 #include "object.h"
diff --git a/sha1dc_git.c b/sha1dc_git.c
index 5c300e8..9b675a0 100644
--- a/sha1dc_git.c
+++ b/sha1dc_git.c
@@ -1,4 +1,6 @@
-#include "cache.h"
+#include "git-compat-util.h"
+#include "sha1dc_git.h"
+#include "hex.h"
 
 #ifdef DC_SHA1_EXTERNAL
 /*
diff --git a/shallow.c b/shallow.c
index 17f9bcd..1cbb05b 100644
--- a/shallow.c
+++ b/shallow.c
@@ -1,4 +1,6 @@
-#include "cache.h"
+#include "git-compat-util.h"
+#include "alloc.h"
+#include "hex.h"
 #include "repository.h"
 #include "tempfile.h"
 #include "lockfile.h"
diff --git a/shallow.h b/shallow.h
index aba6ff5..e9ca7e4 100644
--- a/shallow.h
+++ b/shallow.h
@@ -6,6 +6,8 @@
 #include "repository.h"
 #include "strbuf.h"
 
+struct oid_array;
+
 void set_alternate_shallow_file(struct repository *r, const char *path, int override);
 int register_shallow(struct repository *r, const struct object_id *oid);
 int unregister_shallow(const struct object_id *oid);
diff --git a/shell.c b/shell.c
index af0d7c7..5c67e7b 100644
--- a/shell.c
+++ b/shell.c
@@ -1,4 +1,4 @@
-#include "cache.h"
+#include "git-compat-util.h"
 #include "quote.h"
 #include "exec-cmd.h"
 #include "strbuf.h"
diff --git a/sigchain.c b/sigchain.c
index 022677b..ee778c0 100644
--- a/sigchain.c
+++ b/sigchain.c
@@ -1,4 +1,5 @@
-#include "cache.h"
+#include "git-compat-util.h"
+#include "alloc.h"
 #include "sigchain.h"
 
 #define SIGCHAIN_MAX_SIGNALS 32
diff --git a/sparse-index.c b/sparse-index.c
index 147a133..63216b3 100644
--- a/sparse-index.c
+++ b/sparse-index.c
@@ -1,4 +1,5 @@
 #include "cache.h"
+#include "alloc.h"
 #include "repository.h"
 #include "sparse-index.h"
 #include "tree.h"
diff --git a/split-index.c b/split-index.c
index 5d0f047..95ecfa5 100644
--- a/split-index.c
+++ b/split-index.c
@@ -1,4 +1,5 @@
 #include "cache.h"
+#include "alloc.h"
 #include "split-index.h"
 #include "ewah/ewok.h"
 
diff --git a/statinfo.h b/statinfo.h
new file mode 100644
index 0000000..e49e305
--- /dev/null
+++ b/statinfo.h
@@ -0,0 +1,24 @@
+#ifndef STATINFO_H
+#define STATINFO_H
+
+/*
+ * The "cache_time" is just the low 32 bits of the
+ * time. It doesn't matter if it overflows - we only
+ * check it for equality in the 32 bits we save.
+ */
+struct cache_time {
+	uint32_t sec;
+	uint32_t nsec;
+};
+
+struct stat_data {
+	struct cache_time sd_ctime;
+	struct cache_time sd_mtime;
+	unsigned int sd_dev;
+	unsigned int sd_ino;
+	unsigned int sd_uid;
+	unsigned int sd_gid;
+	unsigned int sd_size;
+};
+
+#endif
diff --git a/strbuf.c b/strbuf.c
index c383f41..1c57ac6 100644
--- a/strbuf.c
+++ b/strbuf.c
@@ -1,4 +1,6 @@
-#include "cache.h"
+#include "git-compat-util.h"
+#include "alloc.h"
+#include "hex.h"
 #include "refs.h"
 #include "string-list.h"
 #include "utf8.h"
diff --git a/string-list.c b/string-list.c
index 42bacae..db473f2 100644
--- a/string-list.c
+++ b/string-list.c
@@ -1,5 +1,6 @@
-#include "cache.h"
+#include "git-compat-util.h"
 #include "string-list.h"
+#include "alloc.h"
 
 void string_list_init_nodup(struct string_list *list)
 {
diff --git a/strvec.c b/strvec.c
index 61a76ce..17d54b6 100644
--- a/strvec.c
+++ b/strvec.c
@@ -1,5 +1,7 @@
-#include "cache.h"
+#include "git-compat-util.h"
 #include "strvec.h"
+#include "alloc.h"
+#include "hex.h"
 #include "strbuf.h"
 
 const char *empty_strvec[] = { NULL };
diff --git a/sub-process.c b/sub-process.c
index 6d42322..1daf5a9 100644
--- a/sub-process.c
+++ b/sub-process.c
@@ -1,6 +1,7 @@
 /*
  * Generic implementation of background process infrastructure.
  */
+#include "git-compat-util.h"
 #include "sub-process.h"
 #include "sigchain.h"
 #include "pkt-line.h"
diff --git a/sub-process.h b/sub-process.h
index e85f21f..6a61638 100644
--- a/sub-process.h
+++ b/sub-process.h
@@ -1,7 +1,6 @@
 #ifndef SUBPROCESS_H
 #define SUBPROCESS_H
 
-#include "git-compat-util.h"
 #include "hashmap.h"
 #include "run-command.h"
 
diff --git a/submodule-config.c b/submodule-config.c
index 4dc61b3..89a7bf0 100644
--- a/submodule-config.c
+++ b/submodule-config.c
@@ -1,5 +1,7 @@
 #include "cache.h"
+#include "alloc.h"
 #include "dir.h"
+#include "hex.h"
 #include "repository.h"
 #include "config.h"
 #include "submodule-config.h"
diff --git a/submodule-config.h b/submodule-config.h
index 28a8ca6..c204587 100644
--- a/submodule-config.h
+++ b/submodule-config.h
@@ -1,7 +1,6 @@
 #ifndef SUBMODULE_CONFIG_CACHE_H
 #define SUBMODULE_CONFIG_CACHE_H
 
-#include "cache.h"
 #include "config.h"
 #include "hashmap.h"
 #include "submodule.h"
diff --git a/submodule.c b/submodule.c
index 3a0dfc4..2a057c3 100644
--- a/submodule.c
+++ b/submodule.c
@@ -1,5 +1,5 @@
-
-#include "cache.h"
+#include "git-compat-util.h"
+#include "alloc.h"
 #include "repository.h"
 #include "config.h"
 #include "submodule-config.h"
@@ -7,6 +7,7 @@
 #include "dir.h"
 #include "diff.h"
 #include "commit.h"
+#include "hex.h"
 #include "revision.h"
 #include "run-command.h"
 #include "diffcore.h"
@@ -1739,7 +1740,7 @@
 	return 0;
 }
 
-static int fetch_start_failure(struct strbuf *err,
+static int fetch_start_failure(struct strbuf *err UNUSED,
 			       void *cb, void *task_cb)
 {
 	struct submodule_parallel_fetch *spf = cb;
@@ -1760,7 +1761,7 @@
 	return type != OBJ_COMMIT;
 }
 
-static int fetch_finish(int retvalue, struct strbuf *err,
+static int fetch_finish(int retvalue, struct strbuf *err UNUSED,
 			void *cb, void *task_cb)
 {
 	struct submodule_parallel_fetch *spf = cb;
diff --git a/t/Makefile b/t/Makefile
index 2c2b252..88fa504 100644
--- a/t/Makefile
+++ b/t/Makefile
@@ -140,9 +140,7 @@
 	$(MAKE) clean
 
 aggregate-results:
-	for f in '$(TEST_RESULTS_DIRECTORY_SQ)'/t*-*.counts; do \
-		echo "$$f"; \
-	done | '$(SHELL_PATH_SQ)' ./aggregate-results.sh
+	@'$(SHELL_PATH_SQ)' ./aggregate-results.sh '$(TEST_RESULTS_DIRECTORY_SQ)'
 
 valgrind:
 	$(MAKE) GIT_TEST_OPTS="$(GIT_TEST_OPTS) --valgrind"
diff --git a/t/aggregate-results.sh b/t/aggregate-results.sh
index 7f2b83b..6e3bcc4 100755
--- a/t/aggregate-results.sh
+++ b/t/aggregate-results.sh
@@ -8,7 +8,7 @@
 total=0
 missing_prereq=
 
-while read file
+for file in "$1"/t*-*.counts
 do
 	while read type value
 	do
diff --git a/t/helper/test-bloom.c b/t/helper/test-bloom.c
index 6c900ca..127f134 100644
--- a/t/helper/test-bloom.c
+++ b/t/helper/test-bloom.c
@@ -1,5 +1,6 @@
-#include "git-compat-util.h"
+#include "cache.h"
 #include "bloom.h"
+#include "hex.h"
 #include "test-tool.h"
 #include "commit.h"
 
diff --git a/t/helper/test-cache-tree.c b/t/helper/test-cache-tree.c
index 9159a17..615e648 100644
--- a/t/helper/test-cache-tree.c
+++ b/t/helper/test-cache-tree.c
@@ -1,6 +1,7 @@
 #define USE_THE_INDEX_VARIABLE
 #include "test-tool.h"
 #include "cache.h"
+#include "hex.h"
 #include "tree.h"
 #include "cache-tree.h"
 #include "parse-options.h"
diff --git a/t/helper/test-crontab.c b/t/helper/test-crontab.c
index e6c1b1e..597027a 100644
--- a/t/helper/test-crontab.c
+++ b/t/helper/test-crontab.c
@@ -1,5 +1,4 @@
 #include "test-tool.h"
-#include "cache.h"
 
 /*
  * Usage: test-tool crontab <file> -l|<input>
diff --git a/t/helper/test-ctype.c b/t/helper/test-ctype.c
index b21bd67..534ca66 100644
--- a/t/helper/test-ctype.c
+++ b/t/helper/test-ctype.c
@@ -1,5 +1,4 @@
 #include "test-tool.h"
-#include "cache.h"
 
 static int rc;
 
diff --git a/t/helper/test-dump-cache-tree.c b/t/helper/test-dump-cache-tree.c
index 454f17b..92dfc1a 100644
--- a/t/helper/test-dump-cache-tree.c
+++ b/t/helper/test-dump-cache-tree.c
@@ -1,6 +1,7 @@
 #define USE_THE_INDEX_VARIABLE
 #include "test-tool.h"
 #include "cache.h"
+#include "hex.h"
 #include "tree.h"
 #include "cache-tree.h"
 
diff --git a/t/helper/test-dump-split-index.c b/t/helper/test-dump-split-index.c
index 0ea97b8..813d0a3 100644
--- a/t/helper/test-dump-split-index.c
+++ b/t/helper/test-dump-split-index.c
@@ -1,6 +1,7 @@
 #define USE_THE_INDEX_VARIABLE
 #include "test-tool.h"
 #include "cache.h"
+#include "hex.h"
 #include "split-index.h"
 #include "ewah/ewok.h"
 
diff --git a/t/helper/test-dump-untracked-cache.c b/t/helper/test-dump-untracked-cache.c
index 6d53683..af953fa 100644
--- a/t/helper/test-dump-untracked-cache.c
+++ b/t/helper/test-dump-untracked-cache.c
@@ -2,6 +2,7 @@
 #include "test-tool.h"
 #include "cache.h"
 #include "dir.h"
+#include "hex.h"
 
 static int compare_untracked(const void *a_, const void *b_)
 {
diff --git a/t/helper/test-example-decorate.c b/t/helper/test-example-decorate.c
index b9d1200..7c7fc8e 100644
--- a/t/helper/test-example-decorate.c
+++ b/t/helper/test-example-decorate.c
@@ -1,5 +1,5 @@
 #include "test-tool.h"
-#include "cache.h"
+#include "git-compat-util.h"
 #include "object.h"
 #include "decorate.h"
 
diff --git a/t/helper/test-fast-rebase.c b/t/helper/test-fast-rebase.c
index efc82dd..b1edb92 100644
--- a/t/helper/test-fast-rebase.c
+++ b/t/helper/test-fast-rebase.c
@@ -15,6 +15,7 @@
 
 #include "cache-tree.h"
 #include "commit.h"
+#include "hex.h"
 #include "lockfile.h"
 #include "merge-ort.h"
 #include "refs.h"
diff --git a/t/helper/test-hash.c b/t/helper/test-hash.c
index 5860dab..0162481 100644
--- a/t/helper/test-hash.c
+++ b/t/helper/test-hash.c
@@ -1,5 +1,6 @@
 #include "test-tool.h"
 #include "cache.h"
+#include "hex.h"
 
 int cmd_hash_impl(int ac, const char **av, int algo)
 {
diff --git a/t/helper/test-json-writer.c b/t/helper/test-json-writer.c
index 8c3edac..86887f5 100644
--- a/t/helper/test-json-writer.c
+++ b/t/helper/test-json-writer.c
@@ -1,5 +1,4 @@
 #include "test-tool.h"
-#include "cache.h"
 #include "json-writer.h"
 
 static const char *expect_obj1 = "{\"a\":\"abc\",\"b\":42,\"c\":true}";
diff --git a/t/helper/test-match-trees.c b/t/helper/test-match-trees.c
index 4079fde..04bc256 100644
--- a/t/helper/test-match-trees.c
+++ b/t/helper/test-match-trees.c
@@ -1,5 +1,6 @@
 #include "test-tool.h"
 #include "cache.h"
+#include "hex.h"
 #include "tree.h"
 
 int cmd__match_trees(int ac, const char **av)
diff --git a/t/helper/test-oid-array.c b/t/helper/test-oid-array.c
index d1324d0..0906993 100644
--- a/t/helper/test-oid-array.c
+++ b/t/helper/test-oid-array.c
@@ -1,5 +1,6 @@
 #include "test-tool.h"
 #include "cache.h"
+#include "hex.h"
 #include "oid-array.h"
 
 static int print_oid(const struct object_id *oid, void *data)
diff --git a/t/helper/test-oidmap.c b/t/helper/test-oidmap.c
index 0acf999..883d40e 100644
--- a/t/helper/test-oidmap.c
+++ b/t/helper/test-oidmap.c
@@ -1,5 +1,6 @@
 #include "test-tool.h"
 #include "cache.h"
+#include "hex.h"
 #include "oidmap.h"
 #include "strbuf.h"
 
diff --git a/t/helper/test-oidtree.c b/t/helper/test-oidtree.c
index d48a409..0b82431 100644
--- a/t/helper/test-oidtree.c
+++ b/t/helper/test-oidtree.c
@@ -1,5 +1,6 @@
 #include "test-tool.h"
 #include "cache.h"
+#include "hex.h"
 #include "oidtree.h"
 
 static enum cb_next print_oid(const struct object_id *oid, void *data)
diff --git a/t/helper/test-pack-mtimes.c b/t/helper/test-pack-mtimes.c
index f7b79da..f68b376 100644
--- a/t/helper/test-pack-mtimes.c
+++ b/t/helper/test-pack-mtimes.c
@@ -1,5 +1,6 @@
 #include "git-compat-util.h"
 #include "test-tool.h"
+#include "hex.h"
 #include "strbuf.h"
 #include "object-store.h"
 #include "packfile.h"
diff --git a/t/helper/test-parse-pathspec-file.c b/t/helper/test-parse-pathspec-file.c
index b3e08ce..71d2131 100644
--- a/t/helper/test-parse-pathspec-file.c
+++ b/t/helper/test-parse-pathspec-file.c
@@ -6,7 +6,7 @@
 int cmd__parse_pathspec_file(int argc, const char **argv)
 {
 	struct pathspec pathspec;
-	const char *pathspec_from_file = NULL;
+	char *pathspec_from_file = NULL;
 	int pathspec_file_nul = 0, i;
 
 	static const char *const usage[] = {
@@ -29,5 +29,6 @@
 		printf("%s\n", pathspec.items[i].original);
 
 	clear_pathspec(&pathspec);
+	free(pathspec_from_file);
 	return 0;
 }
diff --git a/t/helper/test-partial-clone.c b/t/helper/test-partial-clone.c
index 3f102cf..da17fd3 100644
--- a/t/helper/test-partial-clone.c
+++ b/t/helper/test-partial-clone.c
@@ -1,4 +1,5 @@
 #include "cache.h"
+#include "hex.h"
 #include "test-tool.h"
 #include "repository.h"
 #include "object-store.h"
diff --git a/t/helper/test-pcre2-config.c b/t/helper/test-pcre2-config.c
index 5258fdd..5d0b2a2 100644
--- a/t/helper/test-pcre2-config.c
+++ b/t/helper/test-pcre2-config.c
@@ -1,5 +1,4 @@
 #include "test-tool.h"
-#include "cache.h"
 #include "grep.h"
 
 int cmd__pcre2_config(int argc, const char **argv)
diff --git a/t/helper/test-prio-queue.c b/t/helper/test-prio-queue.c
index 133b5e6..4915412 100644
--- a/t/helper/test-prio-queue.c
+++ b/t/helper/test-prio-queue.c
@@ -1,8 +1,7 @@
 #include "test-tool.h"
-#include "cache.h"
 #include "prio-queue.h"
 
-static int intcmp(const void *va, const void *vb, void *data)
+static int intcmp(const void *va, const void *vb, void *data UNUSED)
 {
 	const int *a = va, *b = vb;
 	return *a - *b;
diff --git a/t/helper/test-proc-receive.c b/t/helper/test-proc-receive.c
index a4b305f..7e12d4f 100644
--- a/t/helper/test-proc-receive.c
+++ b/t/helper/test-proc-receive.c
@@ -1,5 +1,6 @@
 #include "cache.h"
 #include "connect.h"
+#include "hex.h"
 #include "parse-options.h"
 #include "pkt-line.h"
 #include "sigchain.h"
diff --git a/t/helper/test-reach.c b/t/helper/test-reach.c
index 2f65c7f..de8f266 100644
--- a/t/helper/test-reach.c
+++ b/t/helper/test-reach.c
@@ -1,8 +1,9 @@
 #include "test-tool.h"
-#include "cache.h"
+#include "alloc.h"
 #include "commit.h"
 #include "commit-reach.h"
 #include "config.h"
+#include "hex.h"
 #include "parse-options.h"
 #include "ref-filter.h"
 #include "string-list.h"
diff --git a/t/helper/test-read-midx.c b/t/helper/test-read-midx.c
index 27072ba..0a883cd 100644
--- a/t/helper/test-read-midx.c
+++ b/t/helper/test-read-midx.c
@@ -1,5 +1,6 @@
 #include "test-tool.h"
 #include "cache.h"
+#include "hex.h"
 #include "midx.h"
 #include "repository.h"
 #include "object-store.h"
diff --git a/t/helper/test-ref-store.c b/t/helper/test-ref-store.c
index ae8a564..1745b08 100644
--- a/t/helper/test-ref-store.c
+++ b/t/helper/test-ref-store.c
@@ -1,5 +1,6 @@
 #include "test-tool.h"
 #include "cache.h"
+#include "hex.h"
 #include "refs.h"
 #include "worktree.h"
 #include "object-store.h"
diff --git a/t/helper/test-repository.c b/t/helper/test-repository.c
index 56f0e3c..10a6dfc 100644
--- a/t/helper/test-repository.c
+++ b/t/helper/test-repository.c
@@ -3,6 +3,7 @@
 #include "commit-graph.h"
 #include "commit.h"
 #include "config.h"
+#include "hex.h"
 #include "object-store.h"
 #include "object.h"
 #include "repository.h"
diff --git a/t/helper/test-run-command.c b/t/helper/test-run-command.c
index 3ecb830..b0d041e 100644
--- a/t/helper/test-run-command.c
+++ b/t/helper/test-run-command.c
@@ -9,8 +9,6 @@
  */
 
 #include "test-tool.h"
-#include "git-compat-util.h"
-#include "cache.h"
 #include "run-command.h"
 #include "strvec.h"
 #include "strbuf.h"
@@ -24,7 +22,7 @@
 static int parallel_next(struct child_process *cp,
 			 struct strbuf *err,
 			 void *cb,
-			 void **task_cb)
+			 void **task_cb UNUSED)
 {
 	struct child_process *d = cb;
 	if (number_callbacks >= 4)
@@ -40,10 +38,10 @@
 	return 1;
 }
 
-static int no_job(struct child_process *cp,
+static int no_job(struct child_process *cp UNUSED,
 		  struct strbuf *err,
-		  void *cb,
-		  void **task_cb)
+		  void *cb UNUSED,
+		  void **task_cb UNUSED)
 {
 	if (err)
 		strbuf_addstr(err, "no further jobs available\n");
@@ -52,10 +50,10 @@
 	return 0;
 }
 
-static int task_finished(int result,
+static int task_finished(int result UNUSED,
 			 struct strbuf *err,
-			 void *pp_cb,
-			 void *pp_task_cb)
+			 void *pp_cb UNUSED,
+			 void *pp_task_cb UNUSED)
 {
 	if (err)
 		strbuf_addstr(err, "asking for a quick stop\n");
diff --git a/t/helper/test-sigchain.c b/t/helper/test-sigchain.c
index d013bcc..d1cf737 100644
--- a/t/helper/test-sigchain.c
+++ b/t/helper/test-sigchain.c
@@ -1,5 +1,4 @@
 #include "test-tool.h"
-#include "cache.h"
 #include "sigchain.h"
 
 #define X(f) \
diff --git a/t/helper/test-simple-ipc.c b/t/helper/test-simple-ipc.c
index 28365ff..3d1436d 100644
--- a/t/helper/test-simple-ipc.c
+++ b/t/helper/test-simple-ipc.c
@@ -3,13 +3,14 @@
  */
 
 #include "test-tool.h"
-#include "cache.h"
+#include "gettext.h"
 #include "strbuf.h"
 #include "simple-ipc.h"
 #include "parse-options.h"
 #include "thread-utils.h"
 #include "strvec.h"
 #include "run-command.h"
+#include "trace2.h"
 
 #ifndef SUPPORTS_SIMPLE_IPC
 int cmd__simple_ipc(int argc, const char **argv)
diff --git a/t/helper/test-submodule-nested-repo-config.c b/t/helper/test-submodule-nested-repo-config.c
index dc1c14b..a3848a8 100644
--- a/t/helper/test-submodule-nested-repo-config.c
+++ b/t/helper/test-submodule-nested-repo-config.c
@@ -1,4 +1,5 @@
 #include "test-tool.h"
+#include "cache.h"
 #include "submodule-config.h"
 
 static void die_usage(const char **argv, const char *msg)
diff --git a/t/helper/test-wildmatch.c b/t/helper/test-wildmatch.c
index 2c103d1..a95bb4d 100644
--- a/t/helper/test-wildmatch.c
+++ b/t/helper/test-wildmatch.c
@@ -1,5 +1,4 @@
 #include "test-tool.h"
-#include "cache.h"
 
 int cmd__wildmatch(int argc, const char **argv)
 {
diff --git a/t/lib-httpd.sh b/t/lib-httpd.sh
index 09cf5ed..6805229 100644
--- a/t/lib-httpd.sh
+++ b/t/lib-httpd.sh
@@ -142,6 +142,7 @@
 	install_script error-smart-http.sh
 	install_script error.sh
 	install_script apply-one-time-perl.sh
+	install_script nph-custom-auth.sh
 
 	ln -s "$LIB_HTTPD_MODULE_PATH" "$HTTPD_ROOT_PATH/modules"
 
@@ -227,8 +228,12 @@
 		git commit -a -m path2 --amend &&
 
 		test_must_fail git push -v origin >output 2>&1 &&
-		(cd "$REMOTE_REPO" &&
-		 test $HEAD = $(git rev-parse --verify HEAD))
+		(
+			cd "$REMOTE_REPO" &&
+			echo "$HEAD" >expect &&
+			git rev-parse --verify HEAD >actual &&
+			test_cmp expect actual
+		)
 	'
 
 	test_expect_success 'non-fast-forward push show ref status' '
diff --git a/t/lib-httpd/apache.conf b/t/lib-httpd/apache.conf
index 31f82fa..f43a25c 100644
--- a/t/lib-httpd/apache.conf
+++ b/t/lib-httpd/apache.conf
@@ -141,6 +141,11 @@
 	SetEnv GIT_HTTP_EXPORT_ALL
 	SetEnv GIT_PROTOCOL
 </LocationMatch>
+<LocationMatch /custom_auth/>
+	SetEnv GIT_EXEC_PATH ${GIT_EXEC_PATH}
+	SetEnv GIT_HTTP_EXPORT_ALL
+	CGIPassAuth on
+</LocationMatch>
 ScriptAlias /smart/incomplete_length/git-upload-pack incomplete-length-upload-pack-v2-http.sh/
 ScriptAlias /smart/incomplete_body/git-upload-pack incomplete-body-upload-pack-v2-http.sh/
 ScriptAlias /smart/no_report/git-receive-pack error-no-report.sh/
@@ -150,6 +155,7 @@
 ScriptAlias /error_smart/ error-smart-http.sh/
 ScriptAlias /error/ error.sh/
 ScriptAliasMatch /one_time_perl/(.*) apply-one-time-perl.sh/$1
+ScriptAliasMatch /custom_auth/(.*) nph-custom-auth.sh/$1
 <Directory ${GIT_EXEC_PATH}>
 	Options FollowSymlinks
 </Directory>
diff --git a/t/lib-httpd/nph-custom-auth.sh b/t/lib-httpd/nph-custom-auth.sh
new file mode 100644
index 0000000..f5345e7
--- /dev/null
+++ b/t/lib-httpd/nph-custom-auth.sh
@@ -0,0 +1,39 @@
+#!/bin/sh
+
+VALID_CREDS_FILE=custom-auth.valid
+CHALLENGE_FILE=custom-auth.challenge
+
+#
+# If $VALID_CREDS_FILE exists in $HTTPD_ROOT_PATH, consider each line as a valid
+# credential for the current request. Each line in the file is considered a
+# valid HTTP Authorization header value. For example:
+#
+# Basic YWxpY2U6c2VjcmV0LXBhc3N3ZA==
+#
+# If $CHALLENGE_FILE exists in $HTTPD_ROOT_PATH, output the contents as headers
+# in a 401 response if no valid authentication credentials were included in the
+# request. For example:
+#
+# WWW-Authenticate: Bearer authorize_uri="id.example.com" p=1 q=0
+# WWW-Authenticate: Basic realm="example.com"
+#
+
+if test -n "$HTTP_AUTHORIZATION" && \
+	grep -Fqsx "${HTTP_AUTHORIZATION}" "$VALID_CREDS_FILE"
+then
+	# Note that although git-http-backend returns a status line, it
+	# does so using a CGI 'Status' header. Because this script is an
+	# No Parsed Headers (NPH) script, we must return a real HTTP
+	# status line.
+	# This is only a test script, so we don't bother to check for
+	# the actual status from git-http-backend and always return 200.
+	echo 'HTTP/1.1 200 OK'
+	exec "$GIT_EXEC_PATH"/git-http-backend
+fi
+
+echo 'HTTP/1.1 401 Authorization Required'
+if test -f "$CHALLENGE_FILE"
+then
+	cat "$CHALLENGE_FILE"
+fi
+echo
diff --git a/t/lib-patch-mode.sh b/t/lib-patch-mode.sh
index cfd76bf..89ca1f7 100644
--- a/t/lib-patch-mode.sh
+++ b/t/lib-patch-mode.sh
@@ -29,8 +29,12 @@
 
 # verify_state <path> <expected-worktree-content> <expected-index-content>
 verify_state () {
-	test "$(cat "$1")" = "$2" &&
-	test "$(git show :"$1")" = "$3"
+	echo "$2" >expect &&
+	test_cmp expect "$1" &&
+
+	echo "$3" >expect &&
+	git show :"$1" >actual &&
+	test_cmp expect actual
 }
 
 # verify_saved_state <path>
@@ -46,5 +50,6 @@
 }
 
 verify_saved_head () {
-	test "$(cat _head)" = "$(git rev-parse HEAD)"
+	git rev-parse HEAD >actual &&
+	test_cmp _head actual
 }
diff --git a/t/lib-submodule-update.sh b/t/lib-submodule-update.sh
index 2d31fcf..dee1499 100644
--- a/t/lib-submodule-update.sh
+++ b/t/lib-submodule-update.sh
@@ -168,20 +168,16 @@
 # Note that this only supports submodules at the root level of the
 # superproject, with the default name, i.e. same as its path.
 test_git_directory_is_unchanged () {
-	(
-		cd ".git/modules/$1" &&
-		# does core.worktree point at the right place?
-		test "$(git config core.worktree)" = "../../../$1" &&
-		# remove it temporarily before comparing, as
-		# "$1/.git/config" lacks it...
-		git config --unset core.worktree
-	) &&
+	# does core.worktree point at the right place?
+	echo "../../../$1" >expect &&
+	git -C ".git/modules/$1" config core.worktree >actual &&
+	test_cmp expect actual &&
+	# remove it temporarily before comparing, as
+	# "$1/.git/config" lacks it...
+	git -C ".git/modules/$1" config --unset core.worktree &&
 	diff -r ".git/modules/$1" "$1/.git" &&
-	(
-		# ... and then restore.
-		cd ".git/modules/$1" &&
-		git config core.worktree "../../../$1"
-	)
+	# ... and then restore.
+	git -C ".git/modules/$1" config core.worktree "../../../$1"
 }
 
 test_git_directory_exists () {
@@ -189,7 +185,9 @@
 	if test -f sub1/.git
 	then
 		# does core.worktree point at the right place?
-		test "$(git -C .git/modules/$1 config core.worktree)" = "../../../$1"
+		echo "../../../$1" >expect &&
+		git -C ".git/modules/$1" config core.worktree >actual &&
+		test_cmp expect actual
 	fi
 }
 
diff --git a/t/t0001-init.sh b/t/t0001-init.sh
index d479303..30a6edc 100755
--- a/t/t0001-init.sh
+++ b/t/t0001-init.sh
@@ -598,9 +598,14 @@
 test_expect_success 'branch -m with the initial branch' '
 	git init rename-initial &&
 	git -C rename-initial branch -m renamed &&
-	test renamed = $(git -C rename-initial symbolic-ref --short HEAD) &&
+	echo renamed >expect &&
+	git -C rename-initial symbolic-ref --short HEAD >actual &&
+	test_cmp expect actual &&
+
 	git -C rename-initial branch -m renamed again &&
-	test again = $(git -C rename-initial symbolic-ref --short HEAD)
+	echo again >expect &&
+	git -C rename-initial symbolic-ref --short HEAD >actual &&
+	test_cmp expect actual
 '
 
 test_done
diff --git a/t/t0002-gitfile.sh b/t/t0002-gitfile.sh
index 26eaca0..e013d38 100755
--- a/t/t0002-gitfile.sh
+++ b/t/t0002-gitfile.sh
@@ -33,7 +33,9 @@
 
 test_expect_success 'final setup + check rev-parse --git-dir' '
 	echo "gitdir: $REAL" >.git &&
-	test "$REAL" = "$(git rev-parse --git-dir)"
+	echo "$REAL" >expect &&
+	git rev-parse --git-dir >actual &&
+	test_cmp expect actual
 '
 
 test_expect_success 'check hash-object' '
diff --git a/t/t0027-auto-crlf.sh b/t/t0027-auto-crlf.sh
index a94ac1e..2f57c86 100755
--- a/t/t0027-auto-crlf.sh
+++ b/t/t0027-auto-crlf.sh
@@ -70,7 +70,8 @@
 				cp CRLF        ${pfx}_CRLF.txt &&
 				cp CRLF_mix_LF ${pfx}_CRLF_mix_LF.txt &&
 				cp LF_mix_CR   ${pfx}_LF_mix_CR.txt &&
-				cp CRLF_nul    ${pfx}_CRLF_nul.txt
+				cp CRLF_nul    ${pfx}_CRLF_nul.txt ||
+				return 1
 			done
 		done
 	done
@@ -101,7 +102,8 @@
 	do
 		fname=${pfx}_$f.txt &&
 		cp $f $fname &&
-		git -c core.autocrlf=$crlf add $fname 2>"${pfx}_$f.err"
+		git -c core.autocrlf=$crlf add $fname 2>"${pfx}_$f.err" ||
+		return 1
 	done &&
 	git commit -m "core.autocrlf $crlf" &&
 	check_warning "$lfname" ${pfx}_LF.err &&
@@ -121,15 +123,19 @@
 	lfmixcr=$1 ; shift
 	crlfnul=$1 ; shift
 	pfx=NNO_attr_${attr}_aeol_${aeol}_${crlf}
-	#Commit files on top of existing file
-	create_gitattributes "$attr" $aeol &&
-	for f in LF CRLF CRLF_mix_LF LF_mix_CR CRLF_nul
-	do
-		fname=${pfx}_$f.txt &&
-		cp $f $fname &&
-		printf Z >>"$fname" &&
-		git -c core.autocrlf=$crlf add $fname 2>"${pfx}_$f.err"
-	done
+
+	test_expect_success 'setup commit NNO files' '
+		#Commit files on top of existing file
+		create_gitattributes "$attr" $aeol &&
+		for f in LF CRLF CRLF_mix_LF LF_mix_CR CRLF_nul
+		do
+			fname=${pfx}_$f.txt &&
+			cp $f $fname &&
+			printf Z >>"$fname" &&
+			git -c core.autocrlf=$crlf add $fname 2>"${pfx}_$f.err" ||
+			return 1
+		done
+	'
 
 	test_expect_success "commit NNO files crlf=$crlf attr=$attr LF" '
 		check_warning "$lfwarn" ${pfx}_LF.err
@@ -163,15 +169,19 @@
 	lfmixcr=$1 ; shift
 	crlfnul=$1 ; shift
 	pfx=MIX_attr_${attr}_aeol_${aeol}_${crlf}
-	#Commit file with CLRF_mix_LF on top of existing file
-	create_gitattributes "$attr" $aeol &&
-	for f in LF CRLF CRLF_mix_LF LF_mix_CR CRLF_nul
-	do
-		fname=${pfx}_$f.txt &&
-		cp CRLF_mix_LF $fname &&
-		printf Z >>"$fname" &&
-		git -c core.autocrlf=$crlf add $fname 2>"${pfx}_$f.err"
-	done
+
+	test_expect_success 'setup commit file with mixed EOL' '
+		#Commit file with CLRF_mix_LF on top of existing file
+		create_gitattributes "$attr" $aeol &&
+		for f in LF CRLF CRLF_mix_LF LF_mix_CR CRLF_nul
+		do
+			fname=${pfx}_$f.txt &&
+			cp CRLF_mix_LF $fname &&
+			printf Z >>"$fname" &&
+			git -c core.autocrlf=$crlf add $fname 2>"${pfx}_$f.err" ||
+			return 1
+		done
+	'
 
 	test_expect_success "commit file with mixed EOL onto LF crlf=$crlf attr=$attr" '
 		check_warning "$lfwarn" ${pfx}_LF.err
@@ -289,17 +299,17 @@
 	lfmixcrlf=$1 ; shift
 	lfmixcr=$1 ; shift
 	crlfnul=$1 ; shift
-	create_gitattributes "$attr" $ident $aeol &&
-	git config core.autocrlf $crlf &&
+	test_expect_success "setup config for checkout attr=$attr ident=$ident aeol=$aeol core.autocrlf=$crlf" '
+		create_gitattributes "$attr" $ident $aeol &&
+		git config core.autocrlf $crlf
+	'
 	pfx=eol_${ceol}_crlf_${crlf}_attr_${attr}_ &&
 	for f in LF CRLF LF_mix_CR CRLF_mix_LF LF_nul
 	do
-		rm crlf_false_attr__$f.txt &&
-		if test -z "$ceol"; then
-			git checkout -- crlf_false_attr__$f.txt
-		else
-			git -c core.eol=$ceol checkout -- crlf_false_attr__$f.txt
-		fi
+		test_expect_success "setup $f checkout ${ceol:+ with -c core.eol=$ceol}"  '
+			rm -f crlf_false_attr__$f.txt &&
+			git ${ceol:+-c core.eol=$ceol} checkout -- crlf_false_attr__$f.txt
+		'
 	done
 
 	test_expect_success "ls-files --eol attr=$attr $ident aeol=$aeol core.autocrlf=$crlf core.eol=$ceol" '
diff --git a/t/t0055-beyond-symlinks.sh b/t/t0055-beyond-symlinks.sh
index 6bada37..c3eb115 100755
--- a/t/t0055-beyond-symlinks.sh
+++ b/t/t0055-beyond-symlinks.sh
@@ -15,12 +15,22 @@
 
 test_expect_success SYMLINKS 'update-index --add beyond symlinks' '
 	test_must_fail git update-index --add c/d &&
-	! ( git ls-files | grep c/d )
+	cat >expect <<-\EOF &&
+	a
+	b/d
+	EOF
+	git ls-files >actual &&
+	test_cmp expect actual
 '
 
 test_expect_success SYMLINKS 'add beyond symlinks' '
 	test_must_fail git add c/d &&
-	! ( git ls-files | grep c/d )
+	cat >expect <<-\EOF &&
+	a
+	b/d
+	EOF
+	git ls-files >actual &&
+	test_cmp expect actual
 '
 
 test_done
diff --git a/t/t0060-path-utils.sh b/t/t0060-path-utils.sh
index 68e29c9..0afa3d0 100755
--- a/t/t0060-path-utils.sh
+++ b/t/t0060-path-utils.sh
@@ -10,20 +10,27 @@
 
 norm_path() {
 	expected=$(test-tool path-utils print_path "$2")
-	test_expect_success $3 "normalize path: $1 => $2" \
-	"test \"\$(test-tool path-utils normalize_path_copy '$1')\" = '$expected'"
+	test_expect_success $3 "normalize path: $1 => $2" "
+		echo '$expected' >expect &&
+		test-tool path-utils normalize_path_copy '$1' >actual &&
+		test_cmp expect actual
+	"
 }
 
 relative_path() {
 	expected=$(test-tool path-utils print_path "$3")
-	test_expect_success $4 "relative path: $1 $2 => $3" \
-	"test \"\$(test-tool path-utils relative_path '$1' '$2')\" = '$expected'"
+	test_expect_success $4 "relative path: $1 $2 => $3" "
+		echo '$expected' >expect &&
+		test-tool path-utils relative_path '$1' '$2' >actual &&
+		test_cmp expect actual
+	"
 }
 
 test_submodule_relative_url() {
 	test_expect_success "test_submodule_relative_url: $1 $2 $3 => $4" "
-		actual=\$(test-tool submodule resolve-relative-url '$1' '$2' '$3') &&
-		test \"\$actual\" = '$4'
+		echo '$4' >expect &&
+		test-tool submodule resolve-relative-url '$1' '$2' '$3' >actual &&
+		test_cmp expect actual
 	"
 }
 
@@ -64,9 +71,11 @@
 		expected=$(($expected-$rootslash+$rootoff))
 		;;
 	esac
-	test_expect_success $4 "longest ancestor: $1 $2 => $expected" \
-	"actual=\$(test-tool path-utils longest_ancestor_length '$1' '$2') &&
-	 test \"\$actual\" = '$expected'"
+	test_expect_success $4 "longest ancestor: $1 $2 => $expected" "
+		echo '$expected' >expect &&
+		test-tool path-utils longest_ancestor_length '$1' '$2' >actual &&
+		test_cmp expect actual
+	"
 }
 
 # Some absolute path tests should be skipped on Windows due to path mangling
@@ -166,8 +175,10 @@
 ancestor //server/share/my-directory //server/share/ 14 MINGW
 
 test_expect_success 'strip_path_suffix' '
-	test c:/msysgit = $(test-tool path-utils strip_path_suffix \
-		c:/msysgit/libexec//git-core libexec/git-core)
+	echo c:/msysgit >expect &&
+	test-tool path-utils strip_path_suffix \
+		c:/msysgit/libexec//git-core libexec/git-core >actual &&
+	test_cmp expect actual
 '
 
 test_expect_success 'absolute path rejects the empty string' '
@@ -188,35 +199,61 @@
 '
 
 test_expect_success POSIX 'real path works on absolute paths 1' '
+	echo / >expect &&
+	test-tool path-utils real_path "/" >actual &&
+	test_cmp expect actual &&
+
 	nopath="hopefully-absent-path" &&
-	test "/" = "$(test-tool path-utils real_path "/")" &&
-	test "/$nopath" = "$(test-tool path-utils real_path "/$nopath")"
+	echo "/$nopath" >expect &&
+	test-tool path-utils real_path "/$nopath" >actual &&
+	test_cmp expect actual
 '
 
 test_expect_success 'real path works on absolute paths 2' '
-	nopath="hopefully-absent-path" &&
 	# Find an existing top-level directory for the remaining tests:
 	d=$(pwd -P | sed -e "s|^\([^/]*/[^/]*\)/.*|\1|") &&
-	test "$d" = "$(test-tool path-utils real_path "$d")" &&
-	test "$d/$nopath" = "$(test-tool path-utils real_path "$d/$nopath")"
+	echo "$d" >expect &&
+	test-tool path-utils real_path "$d" >actual &&
+	test_cmp expect actual &&
+
+	nopath="hopefully-absent-path" &&
+	echo "$d/$nopath" >expect &&
+	test-tool path-utils real_path "$d/$nopath" >actual &&
+	test_cmp expect actual
 '
 
 test_expect_success POSIX 'real path removes extra leading slashes' '
+	echo "/" >expect &&
+	test-tool path-utils real_path "///" >actual &&
+	test_cmp expect actual &&
+
 	nopath="hopefully-absent-path" &&
-	test "/" = "$(test-tool path-utils real_path "///")" &&
-	test "/$nopath" = "$(test-tool path-utils real_path "///$nopath")" &&
+	echo "/$nopath" >expect &&
+	test-tool path-utils real_path "///$nopath" >actual &&
+	test_cmp expect actual &&
+
 	# Find an existing top-level directory for the remaining tests:
 	d=$(pwd -P | sed -e "s|^\([^/]*/[^/]*\)/.*|\1|") &&
-	test "$d" = "$(test-tool path-utils real_path "//$d")" &&
-	test "$d/$nopath" = "$(test-tool path-utils real_path "//$d/$nopath")"
+	echo "$d" >expect &&
+	test-tool path-utils real_path "//$d" >actual &&
+	test_cmp expect actual &&
+
+	echo "$d/$nopath" >expect &&
+	test-tool path-utils real_path "//$d/$nopath" >actual &&
+	test_cmp expect actual
 '
 
 test_expect_success 'real path removes other extra slashes' '
-	nopath="hopefully-absent-path" &&
 	# Find an existing top-level directory for the remaining tests:
 	d=$(pwd -P | sed -e "s|^\([^/]*/[^/]*\)/.*|\1|") &&
-	test "$d" = "$(test-tool path-utils real_path "$d///")" &&
-	test "$d/$nopath" = "$(test-tool path-utils real_path "$d///$nopath")"
+	echo "$d" >expect &&
+	test-tool path-utils real_path "$d///" >actual &&
+	test_cmp expect actual &&
+
+	nopath="hopefully-absent-path" &&
+	echo "$d/$nopath" >expect &&
+	test-tool path-utils real_path "$d///$nopath" >actual &&
+	test_cmp expect actual
 '
 
 test_expect_success SYMLINKS 'real path works on symlinks' '
@@ -227,19 +264,29 @@
 	mkdir third &&
 	dir="$(cd .git && pwd -P)" &&
 	dir2=third/../second/other/.git &&
-	test "$dir" = "$(test-tool path-utils real_path $dir2)" &&
+	echo "$dir" >expect &&
+	test-tool path-utils real_path $dir2 >actual &&
+	test_cmp expect actual &&
 	file="$dir"/index &&
-	test "$file" = "$(test-tool path-utils real_path $dir2/index)" &&
+	echo "$file" >expect &&
+	test-tool path-utils real_path $dir2/index >actual &&
+	test_cmp expect actual &&
 	basename=blub &&
-	test "$dir/$basename" = "$(cd .git && test-tool path-utils real_path "$basename")" &&
+	echo "$dir/$basename" >expect &&
+	test-tool -C .git path-utils real_path "$basename" >actual &&
+	test_cmp expect actual &&
 	ln -s ../first/file .git/syml &&
 	sym="$(cd first && pwd -P)"/file &&
-	test "$sym" = "$(test-tool path-utils real_path "$dir2/syml")"
+	echo "$sym" >expect &&
+	test-tool path-utils real_path "$dir2/syml" >actual &&
+	test_cmp expect actual
 '
 
 test_expect_success SYMLINKS 'prefix_path works with absolute paths to work tree symlinks' '
 	ln -s target symlink &&
-	test "$(test-tool path-utils prefix_path prefix "$(pwd)/symlink")" = "symlink"
+	echo "symlink" >expect &&
+	test-tool path-utils prefix_path prefix "$(pwd)/symlink" >actual &&
+	test_cmp expect actual
 '
 
 test_expect_success 'prefix_path works with only absolute path to work tree' '
@@ -255,7 +302,10 @@
 test_expect_success SYMLINKS 'prefix_path works with absolute path to a symlink to work tree having  same beginning as work tree' '
 	git init repo &&
 	ln -s repo repolink &&
-	test "a" = "$(cd repo && test-tool path-utils prefix_path prefix "$(pwd)/../repolink/a")"
+	echo "a" >expect &&
+	repo_path="$(cd repo && pwd)" &&
+	test-tool -C repo path-utils prefix_path prefix "$repo_path/../repolink/a" >actual &&
+	test_cmp expect actual
 '
 
 relative_path /foo/a/b/c/	/foo/a/b/	c/
diff --git a/t/t0100-previous.sh b/t/t0100-previous.sh
index a16cc3d..70a3223 100755
--- a/t/t0100-previous.sh
+++ b/t/t0100-previous.sh
@@ -12,7 +12,9 @@
 	test_commit A &&
 	git checkout -b junk &&
 	git checkout - &&
-	test "$(git symbolic-ref HEAD)" = refs/heads/main &&
+	echo refs/heads/main >expect &&
+	git symbolic-ref HEAD >actual &&
+	test_cmp expect actual &&
 	git branch -d @{-1} &&
 	test_must_fail git rev-parse --verify refs/heads/junk
 '
@@ -21,7 +23,9 @@
 	git reflog expire --expire=now &&
 	git checkout -b junk2 &&
 	git checkout - &&
-	test "$(git symbolic-ref HEAD)" = refs/heads/main &&
+	echo refs/heads/main >expect &&
+	git symbolic-ref HEAD >actual &&
+	test_cmp expect actual &&
 	test_must_fail git branch -d @{-12} &&
 	git rev-parse --verify refs/heads/main
 '
diff --git a/t/t1401-symbolic-ref.sh b/t/t1401-symbolic-ref.sh
index be23be3..c7745e1 100755
--- a/t/t1401-symbolic-ref.sh
+++ b/t/t1401-symbolic-ref.sh
@@ -33,7 +33,8 @@
 reset_to_sane
 
 test_expect_success 'symbolic-ref refuses bare sha1' '
-	test_must_fail git symbolic-ref HEAD $(git rev-parse HEAD)
+	rev=$(git rev-parse HEAD) &&
+	test_must_fail git symbolic-ref HEAD "$rev"
 '
 
 reset_to_sane
diff --git a/t/t1450-fsck.sh b/t/t1450-fsck.sh
index fdb886d..bca4637 100755
--- a/t/t1450-fsck.sh
+++ b/t/t1450-fsck.sh
@@ -1023,4 +1023,34 @@
 	test_cmp expected actual
 '
 
+test_expect_success 'fsck detects problems in worktree index' '
+	test_when_finished "git worktree remove -f wt" &&
+	git worktree add wt &&
+
+	echo "this will be removed to break the worktree index" >wt/file &&
+	git -C wt add file &&
+	blob=$(git -C wt rev-parse :file) &&
+	remove_object $blob &&
+
+	test_must_fail git fsck --name-objects >actual 2>&1 &&
+	cat >expect <<-EOF &&
+	missing blob $blob (.git/worktrees/wt/index:file)
+	EOF
+	test_cmp expect actual
+'
+
+test_expect_success 'fsck reports problems in main index without filename' '
+	test_when_finished "rm -f .git/index && git read-tree HEAD" &&
+	echo "this object will be removed to break the main index" >file &&
+	git add file &&
+	blob=$(git rev-parse :file) &&
+	remove_object $blob &&
+
+	test_must_fail git fsck --name-objects >actual 2>&1 &&
+	cat >expect <<-EOF &&
+	missing blob $blob (:file)
+	EOF
+	test_cmp expect actual
+'
+
 test_done
diff --git a/t/t1504-ceiling-dirs.sh b/t/t1504-ceiling-dirs.sh
index 0fafcf9..c1679e3 100755
--- a/t/t1504-ceiling-dirs.sh
+++ b/t/t1504-ceiling-dirs.sh
@@ -6,8 +6,12 @@
 . ./test-lib.sh
 
 test_prefix() {
-	test_expect_success "$1" \
-	"test '$2' = \"\$(git rev-parse --show-prefix)\""
+	local expect="$2" &&
+	test_expect_success "$1: git rev-parse --show-prefix is '$2'" '
+		echo "$expect" >expect &&
+		git rev-parse --show-prefix >actual &&
+		test_cmp expect actual
+	'
 }
 
 test_fail() {
diff --git a/t/t1507-rev-parse-upstream.sh b/t/t1507-rev-parse-upstream.sh
index c34714f..549eb31 100755
--- a/t/t1507-rev-parse-upstream.sh
+++ b/t/t1507-rev-parse-upstream.sh
@@ -183,6 +183,11 @@
 	test_cmp expect actual
 '
 
+test_expect_success '@{u} silent error when no upstream' '
+	test_must_fail git rev-parse --verify --quiet @{u} 2>actual &&
+	test_must_be_empty actual
+'
+
 test_expect_success 'branch@{u} error message with misspelt branch' '
 	cat >expect <<-EOF &&
 	fatal: no such branch: ${SQ}no-such-branch${SQ}
diff --git a/t/t2005-checkout-index-symlinks.sh b/t/t2005-checkout-index-symlinks.sh
index 112682a..67d18cf 100755
--- a/t/t2005-checkout-index-symlinks.sh
+++ b/t/t2005-checkout-index-symlinks.sh
@@ -22,8 +22,10 @@
 git checkout-index symlink &&
 test -f symlink'
 
-test_expect_success \
-'the file must be the blob we added during the setup' '
-test "$(git hash-object -t blob symlink)" = $l'
+test_expect_success 'the file must be the blob we added during the setup' '
+	echo "$l" >expect &&
+	git hash-object -t blob symlink >actual &&
+	test_cmp expect actual
+'
 
 test_done
diff --git a/t/t2021-checkout-overwrite.sh b/t/t2021-checkout-overwrite.sh
index 713c3fa..034f62c 100755
--- a/t/t2021-checkout-overwrite.sh
+++ b/t/t2021-checkout-overwrite.sh
@@ -50,10 +50,13 @@
 
 test_expect_success SYMLINKS 'the symlink remained' '
 
-	test_when_finished "rm a/b" &&
 	test -h a/b
 '
 
+test_expect_success 'cleanup after previous symlink tests' '
+	rm a/b
+'
+
 test_expect_success SYMLINKS 'checkout -f must not follow symlinks when removing entries' '
 	git checkout -f start &&
 	mkdir dir &&
@@ -66,4 +69,15 @@
 	test_path_is_file untracked/f
 '
 
+test_expect_success 'checkout --overwrite-ignore should succeed if only ignored files in the way' '
+	git checkout -b df_conflict &&
+	test_commit contents some_dir &&
+	git checkout start &&
+	mkdir some_dir &&
+	echo autogenerated information >some_dir/ignore &&
+	echo ignore >.git/info/exclude &&
+	git checkout --overwrite-ignore df_conflict &&
+	! test_path_is_dir some_dir
+'
+
 test_done
diff --git a/t/t2060-switch.sh b/t/t2060-switch.sh
index 5a7caf9..e247a47 100755
--- a/t/t2060-switch.sh
+++ b/t/t2060-switch.sh
@@ -146,4 +146,33 @@
 	test_cmp_config "" --default "" branch.main2.merge
 '
 
+test_expect_success 'switch back when temporarily detached and checked out elsewhere ' '
+	test_when_finished "
+		git worktree remove wt1 ||:
+		git worktree remove wt2 ||:
+		git checkout - ||:
+		git branch -D shared ||:
+	" &&
+	git checkout -b shared &&
+	test_commit shared-first &&
+	HASH1=$(git rev-parse --verify HEAD) &&
+	test_commit shared-second &&
+	test_commit shared-third &&
+	HASH2=$(git rev-parse --verify HEAD) &&
+	git worktree add wt1 -f shared &&
+	git -C wt1 bisect start &&
+	git -C wt1 bisect good $HASH1 &&
+	git -C wt1 bisect bad $HASH2 &&
+	git worktree add wt2 -f shared &&
+	git -C wt2 bisect start &&
+	git -C wt2 bisect good $HASH1 &&
+	git -C wt2 bisect bad $HASH2 &&
+	# we test in both worktrees to ensure that works
+	# as expected with "first" and "next" worktrees
+	test_must_fail git -C wt1 switch shared &&
+	git -C wt1 switch --ignore-other-worktrees shared &&
+	test_must_fail git -C wt2 switch shared &&
+	git -C wt2 switch --ignore-other-worktrees shared
+'
+
 test_done
diff --git a/t/t2070-restore.sh b/t/t2070-restore.sh
index 7c43ddf..c5d19dd 100755
--- a/t/t2070-restore.sh
+++ b/t/t2070-restore.sh
@@ -137,4 +137,20 @@
 	test_must_fail git rev-parse HEAD:new1
 '
 
+test_expect_success 'restore with merge options rejects --staged' '
+	for opts in \
+		"--staged --ours" \
+		"--staged --theirs" \
+		"--staged --merge" \
+		"--staged --conflict=diff3" \
+		"--staged --worktree --ours" \
+		"--staged --worktree --theirs" \
+		"--staged --worktree --merge" \
+		"--staged --worktree --conflict=zdiff3"
+	do
+		test_must_fail git restore $opts . 2>err &&
+		grep "cannot be used with --staged" err || return
+	done
+'
+
 test_done
diff --git a/t/t3013-ls-files-format.sh b/t/t3013-ls-files-format.sh
index efb7450..ef6fb53 100755
--- a/t/t3013-ls-files-format.sh
+++ b/t/t3013-ls-files-format.sh
@@ -54,6 +54,22 @@
 	test_cmp expect actual
 '
 
+test_expect_success 'git ls-files --format with relative path' '
+	cat >expect <<-\EOF &&
+	../o1.txt
+	../o2.txt
+	../o3.txt
+	../o4.txt
+	../o5.txt
+	../o6.txt
+	EOF
+	mkdir sub &&
+	cd sub &&
+	git ls-files --format="%(path)" ":/" >../actual &&
+	cd .. &&
+	test_cmp expect actual
+'
+
 test_expect_success 'git ls-files --format with -m' '
 	echo change >o1.txt &&
 	cat >expect <<-\EOF &&
diff --git a/t/t3200-branch.sh b/t/t3200-branch.sh
index 5a169b6..5a8a482 100755
--- a/t/t3200-branch.sh
+++ b/t/t3200-branch.sh
@@ -245,9 +245,13 @@
 	(
 		cd bazdir &&
 		git branch -M baz bam &&
-		test $(git rev-parse --abbrev-ref HEAD) = bam
+		echo bam >expect &&
+		git rev-parse --abbrev-ref HEAD >actual &&
+		test_cmp expect actual
 	) &&
-	test $(git rev-parse --abbrev-ref HEAD) = bam &&
+	echo bam >expect &&
+	git rev-parse --abbrev-ref HEAD >actual &&
+	test_cmp expect actual &&
 	rm -r bazdir &&
 	git worktree prune
 '
diff --git a/t/t3400-rebase.sh b/t/t3400-rebase.sh
index d5a8ee3..3ce918f 100755
--- a/t/t3400-rebase.sh
+++ b/t/t3400-rebase.sh
@@ -388,6 +388,20 @@
 	git rebase main main
 '
 
+test_expect_success 'switch to branch checked out elsewhere fails' '
+	test_when_finished "
+		git worktree remove wt1 &&
+		git worktree remove wt2 &&
+		git branch -d shared
+	" &&
+	git worktree add wt1 -b shared &&
+	git worktree add wt2 -f shared &&
+	# we test in both worktrees to ensure that works
+	# as expected with "first" and "next" worktrees
+	test_must_fail git -C wt1 rebase shared shared &&
+	test_must_fail git -C wt2 rebase shared shared
+'
+
 test_expect_success 'switch to branch not checked out' '
 	git checkout main &&
 	git branch other &&
diff --git a/t/t3436-rebase-more-options.sh b/t/t3436-rebase-more-options.sh
index 94671d3..c3184c9 100755
--- a/t/t3436-rebase-more-options.sh
+++ b/t/t3436-rebase-more-options.sh
@@ -40,6 +40,24 @@
 	EOF
 '
 
+test_expect_success 'bad -X <strategy-option> arguments: unclosed quote' '
+	cat >expect <<-\EOF &&
+	fatal: could not split '\''--bad'\'': unclosed quote
+	EOF
+	test_expect_code 128 git rebase -X"bad argument\"" side main >out 2>actual &&
+	test_must_be_empty out &&
+	test_cmp expect actual
+'
+
+test_expect_success 'bad -X <strategy-option> arguments: bad escape' '
+	cat >expect <<-\EOF &&
+	fatal: could not split '\''--bad'\'': cmdline ends with \
+	EOF
+	test_expect_code 128 git rebase -X"bad escape \\" side main >out 2>actual &&
+	test_must_be_empty out &&
+	test_cmp expect actual
+'
+
 test_expect_success '--ignore-whitespace works with apply backend' '
 	test_must_fail git rebase --apply main side &&
 	git rebase --abort &&
diff --git a/t/t3700-add.sh b/t/t3700-add.sh
index 51afbd7..82dd768 100755
--- a/t/t3700-add.sh
+++ b/t/t3700-add.sh
@@ -106,24 +106,32 @@
 
 test_expect_success '.gitignore is honored' '
 	git add . &&
-	! (git ls-files | grep "\\.ig")
+	git ls-files >files &&
+	sed -n "/\\.ig/p" <files >actual &&
+	test_must_be_empty actual
 '
 
 test_expect_success 'error out when attempting to add ignored ones without -f' '
 	test_must_fail git add a.?? &&
-	! (git ls-files | grep "\\.ig")
+	git ls-files >files &&
+	sed -n "/\\.ig/p" <files >actual &&
+	test_must_be_empty actual
 '
 
 test_expect_success 'error out when attempting to add ignored ones without -f' '
 	test_must_fail git add d.?? &&
-	! (git ls-files | grep "\\.ig")
+	git ls-files >files &&
+	sed -n "/\\.ig/p" <files >actual &&
+	test_must_be_empty actual
 '
 
 test_expect_success 'error out when attempting to add ignored ones but add others' '
 	touch a.if &&
 	test_must_fail git add a.?? &&
-	! (git ls-files | grep "\\.ig") &&
-	(git ls-files | grep a.if)
+	git ls-files >files &&
+	sed -n "/\\.ig/p" <files >actual &&
+	test_must_be_empty actual &&
+	grep a.if files
 '
 
 test_expect_success 'add ignored ones with -f' '
diff --git a/t/t3701-add-interactive.sh b/t/t3701-add-interactive.sh
index 3a99837..b8aaece 100755
--- a/t/t3701-add-interactive.sh
+++ b/t/t3701-add-interactive.sh
@@ -311,9 +311,11 @@
 	echo content >>file &&
 	chmod +x file &&
 	printf "y\\ny\\n" | git add -p &&
-	git diff --cached file | grep "new mode" &&
-	git diff --cached file | grep "+content" &&
-	test -z "$(git diff file)"
+	git diff --cached file >out &&
+	grep "new mode" out &&
+	grep "+content" out &&
+	git diff file >out &&
+	test_must_be_empty out
 '
 
 # end of tests disabled when filemode is not usable
@@ -1075,4 +1077,25 @@
 	test_cmp expect actual
 '
 
+test_expect_success 'reset -p with unmerged files' '
+	test_when_finished "git checkout --force main" &&
+	test_commit one conflict &&
+	git checkout -B side HEAD^ &&
+	test_commit two conflict &&
+	test_must_fail git merge one &&
+
+	# this is a noop with only an unmerged entry
+	git reset -p &&
+
+	# add files that sort before and after unmerged entry
+	echo a >a &&
+	echo z >z &&
+	git add a z &&
+
+	# confirm that we can reset those files
+	printf "%s\n" y y | git reset -p &&
+	git diff-index --cached --diff-filter=u HEAD >staged &&
+	test_must_be_empty staged
+'
+
 test_done
diff --git a/t/t4013-diff-various.sh b/t/t4013-diff-various.sh
index dfcf3a0..5de1d19 100755
--- a/t/t4013-diff-various.sh
+++ b/t/t4013-diff-various.sh
@@ -616,4 +616,46 @@
 	test_i18ngrep "invalid regex given to -I: " error
 '
 
+# check_prefix <patch> <src> <dst>
+# check only lines with paths to avoid dependency on exact oid/contents
+check_prefix () {
+	grep -E '^(diff|---|\+\+\+) ' "$1" >actual.paths &&
+	cat >expect <<-EOF &&
+	diff --git $2 $3
+	--- $2
+	+++ $3
+	EOF
+	test_cmp expect actual.paths
+}
+
+test_expect_success 'diff-files does not respect diff.noprefix' '
+	git -c diff.noprefix diff-files -p >actual &&
+	check_prefix actual a/file0 b/file0
+'
+
+test_expect_success 'diff-files respects --no-prefix' '
+	git diff-files -p --no-prefix >actual &&
+	check_prefix actual file0 file0
+'
+
+test_expect_success 'diff respects diff.noprefix' '
+	git -c diff.noprefix diff >actual &&
+	check_prefix actual file0 file0
+'
+
+test_expect_success 'diff --default-prefix overrides diff.noprefix' '
+	git -c diff.noprefix diff --default-prefix >actual &&
+	check_prefix actual a/file0 b/file0
+'
+
+test_expect_success 'diff respects diff.mnemonicprefix' '
+	git -c diff.mnemonicprefix diff >actual &&
+	check_prefix actual i/file0 w/file0
+'
+
+test_expect_success 'diff --default-prefix overrides diff.mnemonicprefix' '
+	git -c diff.mnemonicprefix diff --default-prefix >actual &&
+	check_prefix actual a/file0 b/file0
+'
+
 test_done
diff --git a/t/t4014-format-patch.sh b/t/t4014-format-patch.sh
index f3313b8..8c3d066 100755
--- a/t/t4014-format-patch.sh
+++ b/t/t4014-format-patch.sh
@@ -59,6 +59,10 @@
 	test_tick &&
 	git commit -m "patchid 3" &&
 
+	git checkout -b empty main &&
+	test_tick &&
+	git commit --allow-empty -m "empty commit" &&
+
 	git checkout main
 '
 
@@ -128,6 +132,12 @@
 	grep "^Side .* with .* backslash-n" actual
 '
 
+test_expect_success 'format-patch empty commit' '
+	git format-patch --stdout main..empty >empty &&
+	grep "^From " empty >from &&
+	test_line_count = 1 from
+'
+
 test_expect_success 'extra headers' '
 	git config format.headers "To: R E Cipient <rcipient@example.com>
 " &&
@@ -2386,4 +2396,20 @@
 	test_cmp expect actual
 '
 
+test_expect_success 'format-patch does not respect diff.noprefix' '
+	git -c diff.noprefix format-patch -1 --stdout >actual &&
+	grep "^--- a/blorp" actual
+'
+
+test_expect_success 'format-patch respects format.noprefix' '
+	git -c format.noprefix format-patch -1 --stdout >actual &&
+	grep "^--- blorp" actual
+'
+
+test_expect_success 'format-patch --default-prefix overrides format.noprefix' '
+	git -c format.noprefix \
+		format-patch -1 --default-prefix --stdout >actual &&
+	grep "^--- a/blorp" actual
+'
+
 test_done
diff --git a/t/t5510-fetch.sh b/t/t5510-fetch.sh
index 34a1261..dc44da9 100755
--- a/t/t5510-fetch.sh
+++ b/t/t5510-fetch.sh
@@ -1171,6 +1171,15 @@
 	)
 '
 
+for section in fetch transfer
+do
+	test_expect_success "$section.hideRefs affects connectivity check" '
+		GIT_TRACE="$PWD"/trace git -c $section.hideRefs=refs -c \
+			$section.hideRefs="!refs/tags/" fetch &&
+		grep "git rev-list .*--exclude-hidden=fetch" trace
+	'
+done
+
 setup_negotiation_tip () {
 	SERVER="$1"
 	URL="$2"
diff --git a/t/t5514-fetch-multiple.sh b/t/t5514-fetch-multiple.sh
index 54f422c..98f034a 100755
--- a/t/t5514-fetch-multiple.sh
+++ b/t/t5514-fetch-multiple.sh
@@ -58,6 +58,13 @@
 	 test_cmp expect output)
 '
 
+test_expect_success 'git fetch --all --no-write-fetch-head' '
+	(cd test &&
+	rm -f .git/FETCH_HEAD &&
+	git fetch --all --no-write-fetch-head &&
+	test_path_is_missing .git/FETCH_HEAD)
+'
+
 test_expect_success 'git fetch --all should continue if a remote has errors' '
 	(git clone one test2 &&
 	 cd test2 &&
diff --git a/t/t5516-fetch-push.sh b/t/t5516-fetch-push.sh
index 98a27a29..19ebefa 100755
--- a/t/t5516-fetch-push.sh
+++ b/t/t5516-fetch-push.sh
@@ -401,6 +401,11 @@
 
 '
 
+test_expect_success 'push with onelevel ref' '
+	mk_test testrepo heads/main &&
+	test_must_fail git push testrepo HEAD:refs/onelevel
+'
+
 test_expect_success 'push with colon-less refspec (1)' '
 
 	mk_test testrepo heads/frotz tags/frotz &&
@@ -898,6 +903,13 @@
 	test_must_fail git push testrepo --delete ""
 '
 
+test_expect_success 'push --delete onelevel refspecs' '
+	mk_test testrepo heads/main &&
+	git -C testrepo update-ref refs/onelevel refs/heads/main &&
+	git push testrepo --delete refs/onelevel &&
+	test_must_fail git -C testrepo rev-parse --verify refs/onelevel
+'
+
 test_expect_success 'warn on push to HEAD of non-bare repository' '
 	mk_test testrepo heads/main &&
 	(
diff --git a/t/t5522-pull-symlink.sh b/t/t5522-pull-symlink.sh
index 394bc60..cc5496e 100755
--- a/t/t5522-pull-symlink.sh
+++ b/t/t5522-pull-symlink.sh
@@ -79,7 +79,9 @@
 		git commit -m push ./file &&
 		git push
 	) &&
-	test push = $(git show HEAD:subdir/file)
+	echo push >expect &&
+	git show HEAD:subdir/file >actual &&
+	test_cmp expect actual
 '
 
 test_done
diff --git a/t/t5526-fetch-submodules.sh b/t/t5526-fetch-submodules.sh
index b9546ef..dcdbe26 100755
--- a/t/t5526-fetch-submodules.sh
+++ b/t/t5526-fetch-submodules.sh
@@ -167,6 +167,19 @@
 	verify_fetch_result actual.err
 '
 
+test_expect_success "fetch --recurse-submodules honors --no-write-fetch-head" '
+	(
+		cd downstream &&
+		git submodule foreach --recursive \
+		sh -c "cd \"\$(git rev-parse --git-dir)\" && rm -f FETCH_HEAD" &&
+
+		git fetch --recurse-submodules --no-write-fetch-head &&
+
+		git submodule foreach --recursive \
+		sh -c "cd \"\$(git rev-parse --git-dir)\" && ! test -f FETCH_HEAD"
+	)
+'
+
 test_expect_success "submodule.recurse option triggers recursive fetch" '
 	add_submodule_commits &&
 	(
diff --git a/t/t5563-simple-http-auth.sh b/t/t5563-simple-http-auth.sh
new file mode 100755
index 0000000..ccf7e54
--- /dev/null
+++ b/t/t5563-simple-http-auth.sh
@@ -0,0 +1,325 @@
+#!/bin/sh
+
+test_description='test http auth header and credential helper interop'
+
+. ./test-lib.sh
+. "$TEST_DIRECTORY"/lib-httpd.sh
+
+start_httpd
+
+test_expect_success 'setup_credential_helper' '
+	mkdir "$TRASH_DIRECTORY/bin" &&
+	PATH=$PATH:"$TRASH_DIRECTORY/bin" &&
+	export PATH &&
+
+	CREDENTIAL_HELPER="$TRASH_DIRECTORY/bin/git-credential-test-helper" &&
+	write_script "$CREDENTIAL_HELPER" <<-\EOF
+	cmd=$1
+	teefile=$cmd-query.cred
+	catfile=$cmd-reply.cred
+	sed -n -e "/^$/q" -e "p" >>$teefile
+	if test "$cmd" = "get"
+	then
+		cat $catfile
+	fi
+	EOF
+'
+
+set_credential_reply () {
+	cat >"$TRASH_DIRECTORY/$1-reply.cred"
+}
+
+expect_credential_query () {
+	cat >"$TRASH_DIRECTORY/$1-expect.cred" &&
+	test_cmp "$TRASH_DIRECTORY/$1-expect.cred" \
+		 "$TRASH_DIRECTORY/$1-query.cred"
+}
+
+per_test_cleanup () {
+	rm -f *.cred &&
+	rm -f "$HTTPD_ROOT_PATH"/custom-auth.valid \
+	      "$HTTPD_ROOT_PATH"/custom-auth.challenge
+}
+
+test_expect_success 'setup repository' '
+	test_commit foo &&
+	git init --bare "$HTTPD_DOCUMENT_ROOT_PATH/repo.git" &&
+	git push --mirror "$HTTPD_DOCUMENT_ROOT_PATH/repo.git"
+'
+
+test_expect_success 'access using basic auth' '
+	test_when_finished "per_test_cleanup" &&
+
+	set_credential_reply get <<-EOF &&
+	username=alice
+	password=secret-passwd
+	EOF
+
+	# Basic base64(alice:secret-passwd)
+	cat >"$HTTPD_ROOT_PATH/custom-auth.valid" <<-EOF &&
+	Basic YWxpY2U6c2VjcmV0LXBhc3N3ZA==
+	EOF
+
+	cat >"$HTTPD_ROOT_PATH/custom-auth.challenge" <<-EOF &&
+	WWW-Authenticate: Basic realm="example.com"
+	EOF
+
+	test_config_global credential.helper test-helper &&
+	git ls-remote "$HTTPD_URL/custom_auth/repo.git" &&
+
+	expect_credential_query get <<-EOF &&
+	protocol=http
+	host=$HTTPD_DEST
+	wwwauth[]=Basic realm="example.com"
+	EOF
+
+	expect_credential_query store <<-EOF
+	protocol=http
+	host=$HTTPD_DEST
+	username=alice
+	password=secret-passwd
+	EOF
+'
+
+test_expect_success 'access using basic auth invalid credentials' '
+	test_when_finished "per_test_cleanup" &&
+
+	set_credential_reply get <<-EOF &&
+	username=baduser
+	password=wrong-passwd
+	EOF
+
+	# Basic base64(alice:secret-passwd)
+	cat >"$HTTPD_ROOT_PATH/custom-auth.valid" <<-EOF &&
+	Basic YWxpY2U6c2VjcmV0LXBhc3N3ZA==
+	EOF
+
+	cat >"$HTTPD_ROOT_PATH/custom-auth.challenge" <<-EOF &&
+	WWW-Authenticate: Basic realm="example.com"
+	EOF
+
+	test_config_global credential.helper test-helper &&
+	test_must_fail git ls-remote "$HTTPD_URL/custom_auth/repo.git" &&
+
+	expect_credential_query get <<-EOF &&
+	protocol=http
+	host=$HTTPD_DEST
+	wwwauth[]=Basic realm="example.com"
+	EOF
+
+	expect_credential_query erase <<-EOF
+	protocol=http
+	host=$HTTPD_DEST
+	username=baduser
+	password=wrong-passwd
+	wwwauth[]=Basic realm="example.com"
+	EOF
+'
+
+test_expect_success 'access using basic auth with extra challenges' '
+	test_when_finished "per_test_cleanup" &&
+
+	set_credential_reply get <<-EOF &&
+	username=alice
+	password=secret-passwd
+	EOF
+
+	# Basic base64(alice:secret-passwd)
+	cat >"$HTTPD_ROOT_PATH/custom-auth.valid" <<-EOF &&
+	Basic YWxpY2U6c2VjcmV0LXBhc3N3ZA==
+	EOF
+
+	cat >"$HTTPD_ROOT_PATH/custom-auth.challenge" <<-EOF &&
+	WWW-Authenticate: FooBar param1="value1" param2="value2"
+	WWW-Authenticate: Bearer authorize_uri="id.example.com" p=1 q=0
+	WWW-Authenticate: Basic realm="example.com"
+	EOF
+
+	test_config_global credential.helper test-helper &&
+	git ls-remote "$HTTPD_URL/custom_auth/repo.git" &&
+
+	expect_credential_query get <<-EOF &&
+	protocol=http
+	host=$HTTPD_DEST
+	wwwauth[]=FooBar param1="value1" param2="value2"
+	wwwauth[]=Bearer authorize_uri="id.example.com" p=1 q=0
+	wwwauth[]=Basic realm="example.com"
+	EOF
+
+	expect_credential_query store <<-EOF
+	protocol=http
+	host=$HTTPD_DEST
+	username=alice
+	password=secret-passwd
+	EOF
+'
+
+test_expect_success 'access using basic auth mixed-case wwwauth header name' '
+	test_when_finished "per_test_cleanup" &&
+
+	set_credential_reply get <<-EOF &&
+	username=alice
+	password=secret-passwd
+	EOF
+
+	# Basic base64(alice:secret-passwd)
+	cat >"$HTTPD_ROOT_PATH/custom-auth.valid" <<-EOF &&
+	Basic YWxpY2U6c2VjcmV0LXBhc3N3ZA==
+	EOF
+
+	cat >"$HTTPD_ROOT_PATH/custom-auth.challenge" <<-EOF &&
+	www-authenticate: foobar param1="value1" param2="value2"
+	WWW-AUTHENTICATE: BEARER authorize_uri="id.example.com" p=1 q=0
+	WwW-aUtHeNtIcAtE: baSiC realm="example.com"
+	EOF
+
+	test_config_global credential.helper test-helper &&
+	git ls-remote "$HTTPD_URL/custom_auth/repo.git" &&
+
+	expect_credential_query get <<-EOF &&
+	protocol=http
+	host=$HTTPD_DEST
+	wwwauth[]=foobar param1="value1" param2="value2"
+	wwwauth[]=BEARER authorize_uri="id.example.com" p=1 q=0
+	wwwauth[]=baSiC realm="example.com"
+	EOF
+
+	expect_credential_query store <<-EOF
+	protocol=http
+	host=$HTTPD_DEST
+	username=alice
+	password=secret-passwd
+	EOF
+'
+
+test_expect_success 'access using basic auth with wwwauth header continuations' '
+	test_when_finished "per_test_cleanup" &&
+
+	set_credential_reply get <<-EOF &&
+	username=alice
+	password=secret-passwd
+	EOF
+
+	# Basic base64(alice:secret-passwd)
+	cat >"$HTTPD_ROOT_PATH/custom-auth.valid" <<-EOF &&
+	Basic YWxpY2U6c2VjcmV0LXBhc3N3ZA==
+	EOF
+
+	# Note that leading and trailing whitespace is important to correctly
+	# simulate a continuation/folded header.
+	cat >"$HTTPD_ROOT_PATH/custom-auth.challenge" <<-EOF &&
+	WWW-Authenticate: FooBar param1="value1"
+	 param2="value2"
+	WWW-Authenticate: Bearer authorize_uri="id.example.com"
+	 p=1
+	 q=0
+	WWW-Authenticate: Basic realm="example.com"
+	EOF
+
+	test_config_global credential.helper test-helper &&
+	git ls-remote "$HTTPD_URL/custom_auth/repo.git" &&
+
+	expect_credential_query get <<-EOF &&
+	protocol=http
+	host=$HTTPD_DEST
+	wwwauth[]=FooBar param1="value1" param2="value2"
+	wwwauth[]=Bearer authorize_uri="id.example.com" p=1 q=0
+	wwwauth[]=Basic realm="example.com"
+	EOF
+
+	expect_credential_query store <<-EOF
+	protocol=http
+	host=$HTTPD_DEST
+	username=alice
+	password=secret-passwd
+	EOF
+'
+
+test_expect_success 'access using basic auth with wwwauth header empty continuations' '
+	test_when_finished "per_test_cleanup" &&
+
+	set_credential_reply get <<-EOF &&
+	username=alice
+	password=secret-passwd
+	EOF
+
+	# Basic base64(alice:secret-passwd)
+	cat >"$HTTPD_ROOT_PATH/custom-auth.valid" <<-EOF &&
+	Basic YWxpY2U6c2VjcmV0LXBhc3N3ZA==
+	EOF
+
+	CHALLENGE="$HTTPD_ROOT_PATH/custom-auth.challenge" &&
+
+	# Note that leading and trailing whitespace is important to correctly
+	# simulate a continuation/folded header.
+	printf "">$CHALLENGE &&
+	printf "WWW-Authenticate: FooBar param1=\"value1\"\r\n" >$CHALLENGE &&
+	printf " \r\n" >>$CHALLENGE &&
+	printf " param2=\"value2\"\r\n" >>$CHALLENGE &&
+	printf "WWW-Authenticate: Bearer authorize_uri=\"id.example.com\"\r\n" >>$CHALLENGE &&
+	printf " p=1\r\n" >>$CHALLENGE &&
+	printf " \r\n" >>$CHALLENGE &&
+	printf " q=0\r\n" >>$CHALLENGE &&
+	printf "WWW-Authenticate: Basic realm=\"example.com\"\r\n" >>$CHALLENGE &&
+
+	test_config_global credential.helper test-helper &&
+	git ls-remote "$HTTPD_URL/custom_auth/repo.git" &&
+
+	expect_credential_query get <<-EOF &&
+	protocol=http
+	host=$HTTPD_DEST
+	wwwauth[]=FooBar param1="value1" param2="value2"
+	wwwauth[]=Bearer authorize_uri="id.example.com" p=1 q=0
+	wwwauth[]=Basic realm="example.com"
+	EOF
+
+	expect_credential_query store <<-EOF
+	protocol=http
+	host=$HTTPD_DEST
+	username=alice
+	password=secret-passwd
+	EOF
+'
+
+test_expect_success 'access using basic auth with wwwauth header mixed line-endings' '
+	test_when_finished "per_test_cleanup" &&
+
+	set_credential_reply get <<-EOF &&
+	username=alice
+	password=secret-passwd
+	EOF
+
+	# Basic base64(alice:secret-passwd)
+	cat >"$HTTPD_ROOT_PATH/custom-auth.valid" <<-EOF &&
+	Basic YWxpY2U6c2VjcmV0LXBhc3N3ZA==
+	EOF
+
+	CHALLENGE="$HTTPD_ROOT_PATH/custom-auth.challenge" &&
+
+	# Note that leading and trailing whitespace is important to correctly
+	# simulate a continuation/folded header.
+	printf "">$CHALLENGE &&
+	printf "WWW-Authenticate: FooBar param1=\"value1\"\r\n" >$CHALLENGE &&
+	printf " \r\n" >>$CHALLENGE &&
+	printf "\tparam2=\"value2\"\r\n" >>$CHALLENGE &&
+	printf "WWW-Authenticate: Basic realm=\"example.com\"" >>$CHALLENGE &&
+
+	test_config_global credential.helper test-helper &&
+	git ls-remote "$HTTPD_URL/custom_auth/repo.git" &&
+
+	expect_credential_query get <<-EOF &&
+	protocol=http
+	host=$HTTPD_DEST
+	wwwauth[]=FooBar param1="value1" param2="value2"
+	wwwauth[]=Basic realm="example.com"
+	EOF
+
+	expect_credential_query store <<-EOF
+	protocol=http
+	host=$HTTPD_DEST
+	username=alice
+	password=secret-passwd
+	EOF
+'
+
+test_done
diff --git a/t/t5605-clone-local.sh b/t/t5605-clone-local.sh
index 38b850c..1d7b1ab 100755
--- a/t/t5605-clone-local.sh
+++ b/t/t5605-clone-local.sh
@@ -15,8 +15,12 @@
 	: >file && git add . && git commit -m1 &&
 	git clone --bare . a.git &&
 	git clone --bare . x &&
-	test "$(cd a.git && git config --bool core.bare)" = true &&
-	test "$(cd x && git config --bool core.bare)" = true &&
+	echo true >expect &&
+	git -C a.git config --bool core.bare >actual &&
+	test_cmp expect actual &&
+	echo true >expect &&
+	git -C x config --bool core.bare >actual &&
+	test_cmp expect actual &&
 	git bundle create b1.bundle --all &&
 	git bundle create b2.bundle main &&
 	mkdir dir &&
@@ -29,7 +33,9 @@
 test_expect_success 'local clone without .git suffix' '
 	git clone -l -s a b &&
 	(cd b &&
-	test "$(git config --bool core.bare)" = false &&
+	echo false >expect &&
+	git config --bool core.bare >actual &&
+	test_cmp expect actual &&
 	git fetch)
 '
 
diff --git a/t/t5702-protocol-v2.sh b/t/t5702-protocol-v2.sh
index e4db751..71aabe3 100755
--- a/t/t5702-protocol-v2.sh
+++ b/t/t5702-protocol-v2.sh
@@ -728,6 +728,33 @@
 	test_i18ngrep "negotiate-only requires protocol v2" err
 '
 
+test_expect_success 'push with custom path does not request v2' '
+	rm -f env.trace &&
+	git -C client push \
+		--receive-pack="env >../env.trace; git-receive-pack" \
+		origin HEAD:refs/heads/custom-push-test &&
+	test_path_is_file env.trace &&
+	! grep ^GIT_PROTOCOL env.trace
+'
+
+test_expect_success 'fetch with custom path does request v2' '
+	rm -f env.trace &&
+	git -C client fetch \
+		--upload-pack="env >../env.trace; git-upload-pack" \
+		origin HEAD &&
+	grep ^GIT_PROTOCOL=version=2 env.trace
+'
+
+test_expect_success 'archive with custom path does not request v2' '
+	rm -f env.trace &&
+	git -C client archive \
+		--exec="env >../env.trace; git-upload-archive" \
+		--remote=origin \
+		HEAD >/dev/null &&
+	test_path_is_file env.trace &&
+	! grep ^GIT_PROTOCOL env.trace
+'
+
 # Test protocol v2 with 'http://' transport
 #
 . "$TEST_DIRECTORY"/lib-httpd.sh
diff --git a/t/t6018-rev-list-glob.sh b/t/t6018-rev-list-glob.sh
index aabf590..67d523d 100755
--- a/t/t6018-rev-list-glob.sh
+++ b/t/t6018-rev-list-glob.sh
@@ -187,7 +187,7 @@
 	compare rev-parse "--exclude=upstream/x --remotes=upstream/*" "upstream/one upstream/two"
 '
 
-for section in receive uploadpack
+for section in fetch receive uploadpack
 do
 	test_expect_success "rev-parse --exclude-hidden=$section with --all" '
 		compare "-c transfer.hideRefs=refs/remotes/ rev-parse" "--branches --tags" "--exclude-hidden=$section --all"
diff --git a/t/t6020-bundle-misc.sh b/t/t6020-bundle-misc.sh
index 7d40994..dface8b 100755
--- a/t/t6020-bundle-misc.sh
+++ b/t/t6020-bundle-misc.sh
@@ -10,6 +10,7 @@
 
 . ./test-lib.sh
 . "$TEST_DIRECTORY"/lib-bundle.sh
+. "$TEST_DIRECTORY"/lib-terminal.sh
 
 for cmd in create verify list-heads unbundle
 do
@@ -606,4 +607,42 @@
 	)
 '
 
+test_expect_success 'bundle progress includes write phase' '
+	GIT_PROGRESS_DELAY=0 \
+		git bundle create --progress out.bundle --all 2>err &&
+	grep 'Writing' err
+'
+
+test_expect_success TTY 'create --quiet disables all bundle progress' '
+	test_terminal env GIT_PROGRESS_DELAY=0 \
+		git bundle create --quiet out.bundle --all 2>err &&
+	test_must_be_empty err
+'
+
+test_expect_success 'read bundle over stdin' '
+	git bundle create some.bundle HEAD &&
+
+	git bundle verify - <some.bundle 2>err &&
+	grep "<stdin> is okay" err &&
+
+	git bundle list-heads some.bundle >expect &&
+	git bundle list-heads - <some.bundle >actual &&
+	test_cmp expect actual &&
+
+	git bundle unbundle some.bundle >expect &&
+	git bundle unbundle - <some.bundle >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'send a bundle to standard output' '
+	git bundle create - --all HEAD >bundle-one &&
+	mkdir -p down &&
+	git -C down bundle create - --all HEAD >bundle-two &&
+	git bundle verify bundle-one &&
+	git bundle verify bundle-two &&
+	git ls-remote bundle-one >expect &&
+	git ls-remote bundle-two >actual &&
+	test_cmp expect actual
+'
+
 test_done
diff --git a/t/t6021-rev-list-exclude-hidden.sh b/t/t6021-rev-list-exclude-hidden.sh
index 11c50b7..1a9d37e 100755
--- a/t/t6021-rev-list-exclude-hidden.sh
+++ b/t/t6021-rev-list-exclude-hidden.sh
@@ -22,7 +22,7 @@
 	test_cmp expected err
 '
 
-for section in receive uploadpack
+for section in fetch receive uploadpack
 do
 	test_expect_success "$section: passed multiple times" '
 		echo "fatal: --exclude-hidden= passed more than once" >expected &&
diff --git a/t/t6030-bisect-porcelain.sh b/t/t6030-bisect-porcelain.sh
index 3ba4fdf..fb01bd6 100755
--- a/t/t6030-bisect-porcelain.sh
+++ b/t/t6030-bisect-porcelain.sh
@@ -122,6 +122,29 @@
 	grep bar ".git/BISECT_NAMES"
 '
 
+test_expect_success 'bisect reset: back in a branch checked out also elsewhere' '
+	echo "shared" > branch.expect &&
+	test_bisect_reset() {
+		git -C $1 bisect start &&
+		git -C $1 bisect good $HASH1 &&
+		git -C $1 bisect bad $HASH3 &&
+		git -C $1 bisect reset &&
+		git -C $1 branch --show-current > branch.output &&
+		cmp branch.expect branch.output
+	} &&
+	test_when_finished "
+		git worktree remove wt1 &&
+		git worktree remove wt2 &&
+		git branch -d shared
+	" &&
+	git worktree add wt1 -b shared &&
+	git worktree add wt2 -f shared &&
+	# we test in both worktrees to ensure that works
+	# as expected with "first" and "next" worktrees
+	test_bisect_reset wt1 &&
+	test_bisect_reset wt2
+'
+
 test_expect_success 'bisect reset: back in the main branch' '
 	git bisect reset &&
 	echo "* main" > branch.expect &&
diff --git a/t/t7031-verify-tag-signed-ssh.sh b/t/t7031-verify-tag-signed-ssh.sh
index 36eb86a..20913b3 100755
--- a/t/t7031-verify-tag-signed-ssh.sh
+++ b/t/t7031-verify-tag-signed-ssh.sh
@@ -200,4 +200,14 @@
 	test_must_be_empty actual-forged
 '
 
+test_expect_success GPGSSH 'rev-list --format=%G' '
+	test_config gpg.ssh.allowedSignersFile "${GPGSSH_ALLOWED_SIGNERS}" &&
+	git rev-list -1 --format="%G? %H" sixth-signed >actual &&
+	cat >expect <<-EOF &&
+	commit $(git rev-parse sixth-signed^0)
+	G $(git rev-parse sixth-signed^0)
+	EOF
+	test_cmp expect actual
+'
+
 test_done
diff --git a/t/t7402-submodule-rebase.sh b/t/t7402-submodule-rebase.sh
index b19792b..2b3c363 100755
--- a/t/t7402-submodule-rebase.sh
+++ b/t/t7402-submodule-rebase.sh
@@ -56,12 +56,15 @@
 
 test_expect_success 'interactive rebase with a dirty submodule' '
 
-	test submodule = $(git diff --name-only) &&
+	echo submodule >expect &&
+	git diff --name-only >actual &&
+	test_cmp expect actual &&
 	HEAD=$(git rev-parse HEAD) &&
 	GIT_EDITOR="\"$(pwd)/fake-editor.sh\"" EDITOR_TEXT="pick $HEAD" \
 		git rebase -i HEAD^ &&
-	test submodule = $(git diff --name-only)
-
+	echo submodule >expect &&
+	git diff --name-only >actual &&
+	test_cmp expect actual
 '
 
 test_expect_success 'rebase with dirty file and submodule fails' '
@@ -83,11 +86,19 @@
 	CURRENT=$(cd submodule && git rev-parse HEAD) &&
 	git stash &&
 	test new != $(cat file) &&
-	test submodule = $(git diff --name-only) &&
-	test $CURRENT = $(cd submodule && git rev-parse HEAD) &&
+	echo submodule >expect &&
+	git diff --name-only >actual &&
+	test_cmp expect actual &&
+
+	echo "$CURRENT" >expect &&
+	git -C submodule rev-parse HEAD >actual &&
+	test_cmp expect actual &&
+
 	git stash apply &&
 	test new = $(cat file) &&
-	test $CURRENT = $(cd submodule && git rev-parse HEAD)
+	echo "$CURRENT" >expect &&
+	git -C submodule rev-parse HEAD >actual &&
+	test_cmp expect actual
 
 '
 
diff --git a/t/t7504-commit-msg-hook.sh b/t/t7504-commit-msg-hook.sh
index 07ca46f..d125522 100755
--- a/t/t7504-commit-msg-hook.sh
+++ b/t/t7504-commit-msg-hook.sh
@@ -102,7 +102,9 @@
 '
 
 commit_msg_is () {
-	test "$(git log --pretty=format:%s%b -1)" = "$1"
+	printf "%s" "$1" >expect &&
+	git log --pretty=format:%s%b -1 >actual &&
+	test_cmp expect actual
 }
 
 test_expect_success 'with failing hook' '
diff --git a/t/t7516-commit-races.sh b/t/t7516-commit-races.sh
index f2ce14e..2d38a16 100755
--- a/t/t7516-commit-races.sh
+++ b/t/t7516-commit-races.sh
@@ -10,7 +10,8 @@
 	test_must_fail env EDITOR=./hare-editor git commit --allow-empty -m tortoise -e &&
 	git show -s --pretty=format:%s >subject &&
 	grep hare subject &&
-	test -z "$(git show -s --pretty=format:%P)"
+	git show -s --pretty=format:%P >out &&
+	test_must_be_empty out
 '
 
 test_expect_success 'race to create non-orphan commit' '
diff --git a/t/t7810-grep.sh b/t/t7810-grep.sh
index 8eded6a..39d6d71 100755
--- a/t/t7810-grep.sh
+++ b/t/t7810-grep.sh
@@ -1001,7 +1001,9 @@
 test_expect_success 'grep with CE_VALID file' '
 	git update-index --assume-unchanged t/t &&
 	rm t/t &&
-	test "$(git grep test)" = "t/t:test" &&
+	echo "t/t:test" >expect &&
+	git grep test >actual &&
+	test_cmp expect actual &&
 	git update-index --no-assume-unchanged t/t &&
 	git checkout t/t
 '
diff --git a/t/t9903-bash-prompt.sh b/t/t9903-bash-prompt.sh
index d459fae..d667dda 100755
--- a/t/t9903-bash-prompt.sh
+++ b/t/t9903-bash-prompt.sh
@@ -13,10 +13,10 @@
 . "$GIT_BUILD_DIR/contrib/completion/git-prompt.sh"
 
 actual="$TRASH_DIRECTORY/actual"
-c_red='\\[\\e[31m\\]'
-c_green='\\[\\e[32m\\]'
-c_lblue='\\[\\e[1;34m\\]'
-c_clear='\\[\\e[0m\\]'
+c_red='\001\e[31m\002'
+c_green='\001\e[32m\002'
+c_lblue='\001\e[1;34m\002'
+c_clear='\001\e[0m\002'
 
 test_expect_success 'setup for prompt tests' '
 	git init otherrepo &&
diff --git a/tag.c b/tag.c
index dfbcd7f..18b718c 100644
--- a/tag.c
+++ b/tag.c
@@ -6,6 +6,7 @@
 #include "blob.h"
 #include "alloc.h"
 #include "gpg-interface.h"
+#include "hex.h"
 #include "packfile.h"
 
 const char *tag_type = "tag";
diff --git a/thread-utils.c b/thread-utils.c
index 5329845..1f89ffa 100644
--- a/thread-utils.c
+++ b/thread-utils.c
@@ -1,4 +1,4 @@
-#include "cache.h"
+#include "git-compat-util.h"
 #include "thread-utils.h"
 
 #if defined(hpux) || defined(__hpux) || defined(_hpux)
diff --git a/trace.h b/trace.h
index b6e35b9..d304d55 100644
--- a/trace.h
+++ b/trace.h
@@ -1,7 +1,6 @@
 #ifndef TRACE_H
 #define TRACE_H
 
-#include "git-compat-util.h"
 #include "strbuf.h"
 
 /**
diff --git a/trace2.c b/trace2.c
index 279bddf..e8ba62c 100644
--- a/trace2.c
+++ b/trace2.c
@@ -1,4 +1,4 @@
-#include "cache.h"
+#include "git-compat-util.h"
 #include "config.h"
 #include "json-writer.h"
 #include "quote.h"
@@ -6,6 +6,7 @@
 #include "sigchain.h"
 #include "thread-utils.h"
 #include "version.h"
+#include "trace.h"
 #include "trace2/tr2_cfg.h"
 #include "trace2/tr2_cmd_name.h"
 #include "trace2/tr2_ctr.h"
diff --git a/trace2/tr2_ctr.c b/trace2/tr2_ctr.c
index 483ca7c..b342d3b 100644
--- a/trace2/tr2_ctr.c
+++ b/trace2/tr2_ctr.c
@@ -1,4 +1,4 @@
-#include "cache.h"
+#include "git-compat-util.h"
 #include "thread-utils.h"
 #include "trace2/tr2_tgt.h"
 #include "trace2/tr2_tls.h"
diff --git a/trace2/tr2_sid.c b/trace2/tr2_sid.c
index dc6e75e..5f1ce6f 100644
--- a/trace2/tr2_sid.c
+++ b/trace2/tr2_sid.c
@@ -1,4 +1,5 @@
 #include "cache.h"
+#include "hex.h"
 #include "trace2/tr2_tbuf.h"
 #include "trace2/tr2_sid.h"
 
diff --git a/trace2/tr2_sysenv.c b/trace2/tr2_sysenv.c
index a380dcf..069786c 100644
--- a/trace2/tr2_sysenv.c
+++ b/trace2/tr2_sysenv.c
@@ -1,4 +1,4 @@
-#include "cache.h"
+#include "git-compat-util.h"
 #include "config.h"
 #include "dir.h"
 #include "tr2_sysenv.h"
diff --git a/trace2/tr2_tbuf.c b/trace2/tr2_tbuf.c
index 2498482..c3b3822 100644
--- a/trace2/tr2_tbuf.c
+++ b/trace2/tr2_tbuf.c
@@ -1,4 +1,4 @@
-#include "cache.h"
+#include "git-compat-util.h"
 #include "tr2_tbuf.h"
 
 void tr2_tbuf_local_time(struct tr2_tbuf *tb)
diff --git a/trace2/tr2_tgt_event.c b/trace2/tr2_tgt_event.c
index 16f6332..9e7aab6 100644
--- a/trace2/tr2_tgt_event.c
+++ b/trace2/tr2_tgt_event.c
@@ -1,4 +1,4 @@
-#include "cache.h"
+#include "git-compat-util.h"
 #include "config.h"
 #include "json-writer.h"
 #include "run-command.h"
diff --git a/trace2/tr2_tgt_normal.c b/trace2/tr2_tgt_normal.c
index fbbef68..8672c2c 100644
--- a/trace2/tr2_tgt_normal.c
+++ b/trace2/tr2_tgt_normal.c
@@ -1,4 +1,4 @@
-#include "cache.h"
+#include "git-compat-util.h"
 #include "config.h"
 #include "run-command.h"
 #include "quote.h"
diff --git a/trace2/tr2_tgt_perf.c b/trace2/tr2_tgt_perf.c
index adae803..3f2b2d5 100644
--- a/trace2/tr2_tgt_perf.c
+++ b/trace2/tr2_tgt_perf.c
@@ -1,4 +1,4 @@
-#include "cache.h"
+#include "git-compat-util.h"
 #include "config.h"
 #include "run-command.h"
 #include "quote.h"
diff --git a/trace2/tr2_tls.c b/trace2/tr2_tls.c
index 04900bb..9f46ae1 100644
--- a/trace2/tr2_tls.c
+++ b/trace2/tr2_tls.c
@@ -1,5 +1,7 @@
-#include "cache.h"
+#include "git-compat-util.h"
+#include "alloc.h"
 #include "thread-utils.h"
+#include "trace.h"
 #include "trace2/tr2_tls.h"
 
 /*
diff --git a/trace2/tr2_tmr.c b/trace2/tr2_tmr.c
index 786762d..31d0e4d 100644
--- a/trace2/tr2_tmr.c
+++ b/trace2/tr2_tmr.c
@@ -1,8 +1,9 @@
-#include "cache.h"
+#include "git-compat-util.h"
 #include "thread-utils.h"
 #include "trace2/tr2_tgt.h"
 #include "trace2/tr2_tls.h"
 #include "trace2/tr2_tmr.h"
+#include "trace.h"
 
 #define MY_MAX(a, b) ((a) > (b) ? (a) : (b))
 #define MY_MIN(a, b) ((a) < (b) ? (a) : (b))
diff --git a/trailer.c b/trailer.c
index 0fd5b14..72c3fed 100644
--- a/trailer.c
+++ b/trailer.c
@@ -1,4 +1,5 @@
 #include "cache.h"
+#include "alloc.h"
 #include "config.h"
 #include "string-list.h"
 #include "run-command.h"
diff --git a/transport-helper.c b/transport-helper.c
index 3ea7c2b..82ac63e 100644
--- a/transport-helper.c
+++ b/transport-helper.c
@@ -4,6 +4,7 @@
 #include "run-command.h"
 #include "commit.h"
 #include "diff.h"
+#include "hex.h"
 #include "revision.h"
 #include "remote.h"
 #include "string-list.h"
diff --git a/transport.c b/transport.c
index 77a61a9..fa9bc3b 100644
--- a/transport.c
+++ b/transport.c
@@ -1,5 +1,7 @@
-#include "cache.h"
+#include "git-compat-util.h"
+#include "alloc.h"
 #include "config.h"
+#include "hex.h"
 #include "transport.h"
 #include "hook.h"
 #include "pkt-line.h"
@@ -10,6 +12,7 @@
 #include "walker.h"
 #include "bundle.h"
 #include "dir.h"
+#include "gettext.h"
 #include "refs.h"
 #include "refspec.h"
 #include "branch.h"
@@ -276,8 +279,12 @@
 	}
 
 	data->conn = git_connect(data->fd, transport->url,
-				 for_push ? data->options.receivepack :
-				 data->options.uploadpack,
+				 for_push ?
+					"git-receive-pack" :
+					"git-upload-pack",
+				 for_push ?
+					data->options.receivepack :
+					data->options.uploadpack,
 				 flags);
 
 	return 0;
@@ -911,7 +918,7 @@
 {
 	struct git_transport_data *data = transport->data;
 	data->conn = git_connect(data->fd, transport->url,
-				 executable, 0);
+				 name, executable, 0);
 	fd[0] = data->fd[0];
 	fd[1] = data->fd[1];
 	return 0;
diff --git a/tree-walk.c b/tree-walk.c
index 74f4d71..0e2f5ce 100644
--- a/tree-walk.c
+++ b/tree-walk.c
@@ -1,6 +1,8 @@
 #include "cache.h"
 #include "tree-walk.h"
+#include "alloc.h"
 #include "dir.h"
+#include "hex.h"
 #include "object-store.h"
 #include "tree.h"
 #include "pathspec.h"
diff --git a/tree-walk.h b/tree-walk.h
index 6305d53..25fe27e 100644
--- a/tree-walk.h
+++ b/tree-walk.h
@@ -1,7 +1,9 @@
 #ifndef TREE_WALK_H
 #define TREE_WALK_H
 
-#include "cache.h"
+#include "hash.h"
+
+struct index_state;
 
 #define MAX_TRAVERSE_TREES 8
 
diff --git a/tree.c b/tree.c
index 410e3b4..76a6534 100644
--- a/tree.c
+++ b/tree.c
@@ -1,5 +1,6 @@
 #include "cache.h"
 #include "cache-tree.h"
+#include "hex.h"
 #include "tree.h"
 #include "object-store.h"
 #include "blob.h"
diff --git a/unix-socket.c b/unix-socket.c
index e0be1ba..79800d8 100644
--- a/unix-socket.c
+++ b/unix-socket.c
@@ -1,4 +1,5 @@
-#include "cache.h"
+#include "git-compat-util.h"
+#include "strbuf.h"
 #include "unix-socket.h"
 
 #define DEFAULT_UNIX_STREAM_LISTEN_BACKLOG (5)
diff --git a/unix-stream-server.c b/unix-stream-server.c
index efa2a20..22ac237 100644
--- a/unix-stream-server.c
+++ b/unix-stream-server.c
@@ -1,4 +1,4 @@
-#include "cache.h"
+#include "git-compat-util.h"
 #include "lockfile.h"
 #include "unix-socket.h"
 #include "unix-stream-server.h"
diff --git a/unpack-trees.c b/unpack-trees.c
index 3d05e45..a75fb9f 100644
--- a/unpack-trees.c
+++ b/unpack-trees.c
@@ -3,6 +3,7 @@
 #include "repository.h"
 #include "config.h"
 #include "dir.h"
+#include "hex.h"
 #include "tree.h"
 #include "tree-walk.h"
 #include "cache-tree.h"
@@ -66,8 +67,8 @@
 };
 
 #define ERRORMSG(o,type) \
-	( ((o) && (o)->msgs[(type)]) \
-	  ? ((o)->msgs[(type)])      \
+	( ((o) && (o)->internal.msgs[(type)]) \
+	  ? ((o)->internal.msgs[(type)])      \
 	  : (unpack_plumbing_errors[(type)]) )
 
 static const char *super_prefixed(const char *path, const char *super_prefix)
@@ -108,10 +109,10 @@
 				  const char *cmd)
 {
 	int i;
-	const char **msgs = opts->msgs;
+	const char **msgs = opts->internal.msgs;
 	const char *msg;
 
-	strvec_init(&opts->msgs_to_free);
+	strvec_init(&opts->internal.msgs_to_free);
 
 	if (!strcmp(cmd, "checkout"))
 		msg = advice_enabled(ADVICE_COMMIT_BEFORE_MERGE)
@@ -129,7 +130,7 @@
 			  "Please commit your changes or stash them before you %s.")
 		      : _("Your local changes to the following files would be overwritten by %s:\n%%s");
 	msgs[ERROR_WOULD_OVERWRITE] = msgs[ERROR_NOT_UPTODATE_FILE] =
-		strvec_pushf(&opts->msgs_to_free, msg, cmd, cmd);
+		strvec_pushf(&opts->internal.msgs_to_free, msg, cmd, cmd);
 
 	msgs[ERROR_NOT_UPTODATE_DIR] =
 		_("Updating the following directories would lose untracked files in them:\n%s");
@@ -153,7 +154,7 @@
 			  "Please move or remove them before you %s.")
 		      : _("The following untracked working tree files would be removed by %s:\n%%s");
 	msgs[ERROR_WOULD_LOSE_UNTRACKED_REMOVED] =
-		strvec_pushf(&opts->msgs_to_free, msg, cmd, cmd);
+		strvec_pushf(&opts->internal.msgs_to_free, msg, cmd, cmd);
 
 	if (!strcmp(cmd, "checkout"))
 		msg = advice_enabled(ADVICE_COMMIT_BEFORE_MERGE)
@@ -171,7 +172,7 @@
 			  "Please move or remove them before you %s.")
 		      : _("The following untracked working tree files would be overwritten by %s:\n%%s");
 	msgs[ERROR_WOULD_LOSE_UNTRACKED_OVERWRITTEN] =
-		strvec_pushf(&opts->msgs_to_free, msg, cmd, cmd);
+		strvec_pushf(&opts->internal.msgs_to_free, msg, cmd, cmd);
 
 	/*
 	 * Special case: ERROR_BIND_OVERLAP refers to a pair of paths, we
@@ -189,16 +190,16 @@
 	msgs[WARNING_SPARSE_ORPHANED_NOT_OVERWRITTEN] =
 		_("The following paths were already present and thus not updated despite sparse patterns:\n%s");
 
-	opts->show_all_errors = 1;
+	opts->internal.show_all_errors = 1;
 	/* rejected paths may not have a static buffer */
-	for (i = 0; i < ARRAY_SIZE(opts->unpack_rejects); i++)
-		opts->unpack_rejects[i].strdup_strings = 1;
+	for (i = 0; i < ARRAY_SIZE(opts->internal.unpack_rejects); i++)
+		opts->internal.unpack_rejects[i].strdup_strings = 1;
 }
 
 void clear_unpack_trees_porcelain(struct unpack_trees_options *opts)
 {
-	strvec_clear(&opts->msgs_to_free);
-	memset(opts->msgs, 0, sizeof(opts->msgs));
+	strvec_clear(&opts->internal.msgs_to_free);
+	memset(opts->internal.msgs, 0, sizeof(opts->internal.msgs));
 }
 
 static int do_add_entry(struct unpack_trees_options *o, struct cache_entry *ce,
@@ -210,7 +211,7 @@
 		set |= CE_WT_REMOVE;
 
 	ce->ce_flags = (ce->ce_flags & ~clear) | set;
-	return add_index_entry(&o->result, ce,
+	return add_index_entry(&o->internal.result, ce,
 			       ADD_CACHE_OK_TO_ADD | ADD_CACHE_OK_TO_REPLACE);
 }
 
@@ -218,7 +219,7 @@
 		      const struct cache_entry *ce,
 		      unsigned int set, unsigned int clear)
 {
-	do_add_entry(o, dup_cache_entry(ce, &o->result), set, clear);
+	do_add_entry(o, dup_cache_entry(ce, &o->internal.result), set, clear);
 }
 
 /*
@@ -233,7 +234,7 @@
 	if (o->quiet)
 		return -1;
 
-	if (!o->show_all_errors)
+	if (!o->internal.show_all_errors)
 		return error(ERRORMSG(o, e), super_prefixed(path,
 							    o->super_prefix));
 
@@ -241,7 +242,7 @@
 	 * Otherwise, insert in a list for future display by
 	 * display_(error|warning)_msgs()
 	 */
-	string_list_append(&o->unpack_rejects[e], path);
+	string_list_append(&o->internal.unpack_rejects[e], path);
 	return -1;
 }
 
@@ -253,7 +254,7 @@
 	int e;
 	unsigned error_displayed = 0;
 	for (e = 0; e < NB_UNPACK_TREES_ERROR_TYPES; e++) {
-		struct string_list *rejects = &o->unpack_rejects[e];
+		struct string_list *rejects = &o->internal.unpack_rejects[e];
 
 		if (rejects->nr > 0) {
 			int i;
@@ -281,7 +282,7 @@
 	unsigned warning_displayed = 0;
 	for (e = NB_UNPACK_TREES_ERROR_TYPES + 1;
 	     e < NB_UNPACK_TREES_WARNING_TYPES; e++) {
-		struct string_list *rejects = &o->unpack_rejects[e];
+		struct string_list *rejects = &o->internal.unpack_rejects[e];
 
 		if (rejects->nr > 0) {
 			int i;
@@ -600,13 +601,14 @@
 {
 	ce->ce_flags |= CE_UNPACKED;
 
-	if (o->cache_bottom < o->src_index->cache_nr &&
-	    o->src_index->cache[o->cache_bottom] == ce) {
-		int bottom = o->cache_bottom;
+	if (o->internal.cache_bottom < o->src_index->cache_nr &&
+	    o->src_index->cache[o->internal.cache_bottom] == ce) {
+		int bottom = o->internal.cache_bottom;
+
 		while (bottom < o->src_index->cache_nr &&
 		       o->src_index->cache[bottom]->ce_flags & CE_UNPACKED)
 			bottom++;
-		o->cache_bottom = bottom;
+		o->internal.cache_bottom = bottom;
 	}
 }
 
@@ -652,7 +654,7 @@
 static struct cache_entry *next_cache_entry(struct unpack_trees_options *o)
 {
 	const struct index_state *index = o->src_index;
-	int pos = o->cache_bottom;
+	int pos = o->internal.cache_bottom;
 
 	while (pos < index->cache_nr) {
 		struct cache_entry *ce = index->cache[pos];
@@ -711,7 +713,7 @@
 
 	if (o->diff_index_cached)
 		return;
-	o->cache_bottom = bottom;
+	o->internal.cache_bottom = bottom;
 }
 
 static int switch_cache_bottom(struct traverse_info *info)
@@ -721,13 +723,13 @@
 
 	if (o->diff_index_cached)
 		return 0;
-	ret = o->cache_bottom;
+	ret = o->internal.cache_bottom;
 	pos = find_cache_pos(info->prev, info->name, info->namelen);
 
 	if (pos < -1)
-		o->cache_bottom = -2 - pos;
+		o->internal.cache_bottom = -2 - pos;
 	else if (pos < 0)
-		o->cache_bottom = o->src_index->cache_nr;
+		o->internal.cache_bottom = o->src_index->cache_nr;
 	return ret;
 }
 
@@ -838,7 +840,7 @@
 		mark_ce_used(src[0], o);
 	}
 	free(tree_ce);
-	if (o->debug_unpack)
+	if (o->internal.debug_unpack)
 		printf("Unpacked %d entries from %s to %s using cache-tree\n",
 		       nr_entries,
 		       o->src_index->cache[pos]->name,
@@ -873,9 +875,9 @@
 		 * save and restore cache_bottom anyway to not miss
 		 * unprocessed entries before 'pos'.
 		 */
-		bottom = o->cache_bottom;
+		bottom = o->internal.cache_bottom;
 		ret = traverse_by_cache_tree(pos, nr_entries, n, info);
-		o->cache_bottom = bottom;
+		o->internal.cache_bottom = bottom;
 		return ret;
 	}
 
@@ -1212,8 +1214,8 @@
 		 * cache entry from the index aware logic.
 		 */
 		src[i + o->merge] = create_ce_entry(info, names + i, stage,
-						    &o->result, o->merge,
-						    bit & dirmask);
+						    &o->internal.result,
+						    o->merge, bit & dirmask);
 	}
 
 	if (o->merge) {
@@ -1237,7 +1239,7 @@
 
 static int unpack_failed(struct unpack_trees_options *o, const char *message)
 {
-	discard_index(&o->result);
+	discard_index(&o->internal.result);
 	if (!o->quiet && !o->exiting_early) {
 		if (message)
 			return error("%s", message);
@@ -1260,7 +1262,7 @@
 	struct index_state *index = o->src_index;
 	int pfxlen = info->pathlen;
 
-	for (pos = o->cache_bottom; pos < index->cache_nr; pos++) {
+	for (pos = o->internal.cache_bottom; pos < index->cache_nr; pos++) {
 		const struct cache_entry *ce = index->cache[pos];
 		const char *ce_name, *ce_slash;
 		int cmp, ce_len;
@@ -1271,8 +1273,8 @@
 			 * we can never match it; don't check it
 			 * again.
 			 */
-			if (pos == o->cache_bottom)
-				++o->cache_bottom;
+			if (pos == o->internal.cache_bottom)
+				++o->internal.cache_bottom;
 			continue;
 		}
 		if (!ce_in_traverse_path(ce, info)) {
@@ -1450,7 +1452,7 @@
 	 */
 	if (!is_null_oid(&names[0].oid)) {
 		src[0] = create_ce_entry(info, &names[0], 0,
-					&o->result, 1,
+					&o->internal.result, 1,
 					dirmask & (1ul << 0));
 		src[0]->ce_flags |= (CE_SKIP_WORKTREE | CE_NEW_SKIP_WORKTREE);
 	}
@@ -1487,7 +1489,7 @@
 	while (!p->mode)
 		p++;
 
-	if (o->debug_unpack)
+	if (o->internal.debug_unpack)
 		debug_unpack_callback(n, mask, dirmask, names, info);
 
 	/* Are we supposed to look at the index too? */
@@ -1560,7 +1562,7 @@
 				 * in 'mark_ce_used()'
 				 */
 				if (!src[0] || !S_ISSPARSEDIR(src[0]->ce_mode))
-					o->cache_bottom += matches;
+					o->internal.cache_bottom += matches;
 				return mask;
 			}
 		}
@@ -1809,7 +1811,7 @@
 	if (get_sparse_checkout_patterns(pl) < 0)
 		o->skip_sparse_checkout = 1;
 	else
-		o->pl = pl;
+		o->internal.pl = pl;
 }
 
 static void update_sparsity_for_prefix(const char *prefix,
@@ -1871,8 +1873,12 @@
 
 	if (len > MAX_UNPACK_TREES)
 		die("unpack_trees takes at most %d trees", MAX_UNPACK_TREES);
-	if (o->dir)
-		BUG("o->dir is for internal use only");
+	if (o->internal.dir)
+		BUG("o->internal.dir is for internal use only");
+	if (o->internal.pl)
+		BUG("o->internal.pl is for internal use only");
+	if (o->df_conflict_entry)
+		BUG("o->df_conflict_entry is an output only field");
 
 	trace_performance_enter();
 	trace2_region_enter("unpack_trees", "unpack_trees", the_repository);
@@ -1889,9 +1895,9 @@
 		BUG("UNPACK_RESET_OVERWRITE_UNTRACKED incompatible with preserved ignored files");
 
 	if (!o->preserve_ignored) {
-		o->dir = &dir;
-		o->dir->flags |= DIR_SHOW_IGNORED;
-		setup_standard_excludes(o->dir);
+		o->internal.dir = &dir;
+		o->internal.dir->flags |= DIR_SHOW_IGNORED;
+		setup_standard_excludes(o->internal.dir);
 	}
 
 	if (o->prefix)
@@ -1899,49 +1905,50 @@
 
 	if (!core_apply_sparse_checkout || !o->update)
 		o->skip_sparse_checkout = 1;
-	if (!o->skip_sparse_checkout && !o->pl) {
+	if (!o->skip_sparse_checkout) {
 		memset(&pl, 0, sizeof(pl));
 		free_pattern_list = 1;
 		populate_from_existing_patterns(o, &pl);
 	}
 
-	index_state_init(&o->result, o->src_index->repo);
-	o->result.initialized = 1;
-	o->result.timestamp.sec = o->src_index->timestamp.sec;
-	o->result.timestamp.nsec = o->src_index->timestamp.nsec;
-	o->result.version = o->src_index->version;
+	index_state_init(&o->internal.result, o->src_index->repo);
+	o->internal.result.initialized = 1;
+	o->internal.result.timestamp.sec = o->src_index->timestamp.sec;
+	o->internal.result.timestamp.nsec = o->src_index->timestamp.nsec;
+	o->internal.result.version = o->src_index->version;
 	if (!o->src_index->split_index) {
-		o->result.split_index = NULL;
+		o->internal.result.split_index = NULL;
 	} else if (o->src_index == o->dst_index) {
 		/*
 		 * o->dst_index (and thus o->src_index) will be discarded
-		 * and overwritten with o->result at the end of this function,
-		 * so just use src_index's split_index to avoid having to
-		 * create a new one.
+		 * and overwritten with o->internal.result at the end of
+		 * this function, so just use src_index's split_index to
+		 * avoid having to create a new one.
 		 */
-		o->result.split_index = o->src_index->split_index;
-		o->result.split_index->refcount++;
+		o->internal.result.split_index = o->src_index->split_index;
+		o->internal.result.split_index->refcount++;
 	} else {
-		o->result.split_index = init_split_index(&o->result);
+		o->internal.result.split_index =
+			init_split_index(&o->internal.result);
 	}
-	oidcpy(&o->result.oid, &o->src_index->oid);
-	o->merge_size = len;
+	oidcpy(&o->internal.result.oid, &o->src_index->oid);
+	o->internal.merge_size = len;
 	mark_all_ce_unused(o->src_index);
 
-	o->result.fsmonitor_last_update =
+	o->internal.result.fsmonitor_last_update =
 		xstrdup_or_null(o->src_index->fsmonitor_last_update);
-	o->result.fsmonitor_has_run_once = o->src_index->fsmonitor_has_run_once;
+	o->internal.result.fsmonitor_has_run_once = o->src_index->fsmonitor_has_run_once;
 
 	if (!o->src_index->initialized &&
 	    !repo->settings.command_requires_full_index &&
-	    is_sparse_index_allowed(&o->result, 0))
-		o->result.sparse_index = 1;
+	    is_sparse_index_allowed(&o->internal.result, 0))
+		o->internal.result.sparse_index = 1;
 
 	/*
 	 * Sparse checkout loop #1: set NEW_SKIP_WORKTREE on existing entries
 	 */
 	if (!o->skip_sparse_checkout)
-		mark_new_skip_worktree(o->pl, o->src_index, 0,
+		mark_new_skip_worktree(o->internal.pl, o->src_index, 0,
 				       CE_NEW_SKIP_WORKTREE, o->verbose_update);
 
 	if (!dfc)
@@ -1955,7 +1962,7 @@
 		setup_traverse_info(&info, prefix);
 		info.fn = unpack_callback;
 		info.data = o;
-		info.show_all_errors = o->show_all_errors;
+		info.show_all_errors = o->internal.show_all_errors;
 		info.pathspec = o->pathspec;
 
 		if (o->prefix) {
@@ -1996,7 +2003,7 @@
 	}
 	mark_all_ce_unused(o->src_index);
 
-	if (o->trivial_merges_only && o->nontrivial_merge) {
+	if (o->trivial_merges_only && o->internal.nontrivial_merge) {
 		ret = unpack_failed(o, "Merge requires file-level merging");
 		goto done;
 	}
@@ -2007,13 +2014,13 @@
 		 * If they will have NEW_SKIP_WORKTREE, also set CE_SKIP_WORKTREE
 		 * so apply_sparse_checkout() won't attempt to remove it from worktree
 		 */
-		mark_new_skip_worktree(o->pl, &o->result,
+		mark_new_skip_worktree(o->internal.pl, &o->internal.result,
 				       CE_ADDED, CE_SKIP_WORKTREE | CE_NEW_SKIP_WORKTREE,
 				       o->verbose_update);
 
 		ret = 0;
-		for (i = 0; i < o->result.cache_nr; i++) {
-			struct cache_entry *ce = o->result.cache[i];
+		for (i = 0; i < o->internal.result.cache_nr; i++) {
+			struct cache_entry *ce = o->internal.result.cache[i];
 
 			/*
 			 * Entries marked with CE_ADDED in merged_entry() do not have
@@ -2027,7 +2034,7 @@
 			    verify_absent(ce, WARNING_SPARSE_ORPHANED_NOT_OVERWRITTEN, o))
 				ret = 1;
 
-			if (apply_sparse_checkout(&o->result, ce, o))
+			if (apply_sparse_checkout(&o->internal.result, ce, o))
 				ret = 1;
 		}
 		if (ret == 1) {
@@ -2035,46 +2042,47 @@
 			 * Inability to sparsify or de-sparsify individual
 			 * paths is not an error, but just a warning.
 			 */
-			if (o->show_all_errors)
+			if (o->internal.show_all_errors)
 				display_warning_msgs(o);
 			ret = 0;
 		}
 	}
 
-	ret = check_updates(o, &o->result) ? (-2) : 0;
+	ret = check_updates(o, &o->internal.result) ? (-2) : 0;
 	if (o->dst_index) {
-		move_index_extensions(&o->result, o->src_index);
+		move_index_extensions(&o->internal.result, o->src_index);
 		if (!ret) {
 			if (git_env_bool("GIT_TEST_CHECK_CACHE_TREE", 0))
-				cache_tree_verify(the_repository, &o->result);
+				cache_tree_verify(the_repository,
+						  &o->internal.result);
 			if (!o->skip_cache_tree_update &&
-			    !cache_tree_fully_valid(o->result.cache_tree))
-				cache_tree_update(&o->result,
+			    !cache_tree_fully_valid(o->internal.result.cache_tree))
+				cache_tree_update(&o->internal.result,
 						  WRITE_TREE_SILENT |
 						  WRITE_TREE_REPAIR);
 		}
 
-		o->result.updated_workdir = 1;
+		o->internal.result.updated_workdir = 1;
 		discard_index(o->dst_index);
-		*o->dst_index = o->result;
+		*o->dst_index = o->internal.result;
 	} else {
-		discard_index(&o->result);
+		discard_index(&o->internal.result);
 	}
 	o->src_index = NULL;
 
 done:
 	if (free_pattern_list)
 		clear_pattern_list(&pl);
-	if (o->dir) {
-		dir_clear(o->dir);
-		o->dir = NULL;
+	if (o->internal.dir) {
+		dir_clear(o->internal.dir);
+		o->internal.dir = NULL;
 	}
 	trace2_region_leave("unpack_trees", "unpack_trees", the_repository);
 	trace_performance_leave("unpack_trees");
 	return ret;
 
 return_failed:
-	if (o->show_all_errors)
+	if (o->internal.show_all_errors)
 		display_error_msgs(o);
 	mark_all_ce_unused(o->src_index);
 	ret = unpack_failed(o, NULL);
@@ -2089,16 +2097,17 @@
  *
  * CE_NEW_SKIP_WORKTREE is used internally.
  */
-enum update_sparsity_result update_sparsity(struct unpack_trees_options *o)
+enum update_sparsity_result update_sparsity(struct unpack_trees_options *o,
+					    struct pattern_list *pl)
 {
 	enum update_sparsity_result ret = UPDATE_SPARSITY_SUCCESS;
-	struct pattern_list pl;
 	int i;
 	unsigned old_show_all_errors;
 	int free_pattern_list = 0;
 
-	old_show_all_errors = o->show_all_errors;
-	o->show_all_errors = 1;
+	old_show_all_errors = o->internal.show_all_errors;
+	o->internal.show_all_errors = 1;
+	index_state_init(&o->internal.result, o->src_index->repo);
 
 	/* Sanity checks */
 	if (!o->update || o->index_only || o->skip_sparse_checkout)
@@ -2109,20 +2118,19 @@
 	trace_performance_enter();
 
 	/* If we weren't given patterns, use the recorded ones */
-	if (!o->pl) {
-		memset(&pl, 0, sizeof(pl));
+	if (!pl) {
 		free_pattern_list = 1;
-		populate_from_existing_patterns(o, &pl);
-		if (o->skip_sparse_checkout)
-			goto skip_sparse_checkout;
+		pl = xcalloc(1, sizeof(*pl));
+		populate_from_existing_patterns(o, pl);
 	}
+	o->internal.pl = pl;
 
 	/* Expand sparse directories as needed */
-	expand_index(o->src_index, o->pl);
+	expand_index(o->src_index, o->internal.pl);
 
 	/* Set NEW_SKIP_WORKTREE on existing entries. */
 	mark_all_ce_unused(o->src_index);
-	mark_new_skip_worktree(o->pl, o->src_index, 0,
+	mark_new_skip_worktree(o->internal.pl, o->src_index, 0,
 			       CE_NEW_SKIP_WORKTREE, o->verbose_update);
 
 	/* Then loop over entries and update/remove as needed */
@@ -2142,14 +2150,16 @@
 			ret = UPDATE_SPARSITY_WARNINGS;
 	}
 
-skip_sparse_checkout:
 	if (check_updates(o, o->src_index))
 		ret = UPDATE_SPARSITY_WORKTREE_UPDATE_FAILURES;
 
 	display_warning_msgs(o);
-	o->show_all_errors = old_show_all_errors;
-	if (free_pattern_list)
-		clear_pattern_list(&pl);
+	o->internal.show_all_errors = old_show_all_errors;
+	if (free_pattern_list) {
+		clear_pattern_list(pl);
+		free(pl);
+		o->internal.pl = NULL;
+	}
 	trace_performance_leave("update_sparsity");
 	return ret;
 }
@@ -2244,15 +2254,15 @@
 }
 
 /*
- * TODO: We should actually invalidate o->result, not src_index [1].
+ * TODO: We should actually invalidate o->internal.result, not src_index [1].
  * But since cache tree and untracked cache both are not copied to
- * o->result until unpacking is complete, we invalidate them on
+ * o->internal.result until unpacking is complete, we invalidate them on
  * src_index instead with the assumption that they will be copied to
  * dst_index at the end.
  *
  * [1] src_index->cache_tree is also used in unpack_callback() so if
- * we invalidate o->result, we need to update it to use
- * o->result.cache_tree as well.
+ * we invalidate o->internal.result, we need to update it to use
+ * o->internal.result.cache_tree as well.
  */
 static void invalidate_ce_path(const struct cache_entry *ce,
 			       struct unpack_trees_options *o)
@@ -2336,8 +2346,8 @@
 	pathbuf = xstrfmt("%.*s/", namelen, ce->name);
 
 	memset(&d, 0, sizeof(d));
-	if (o->dir)
-		d.exclude_per_dir = o->dir->exclude_per_dir;
+	if (o->internal.dir)
+		setup_standard_excludes(&d);
 	i = read_directory(&d, o->src_index, pathbuf, namelen+1, NULL);
 	dir_clear(&d);
 	free(pathbuf);
@@ -2391,8 +2401,8 @@
 	if (ignore_case && icase_exists(o, name, len, st))
 		return 0;
 
-	if (o->dir &&
-	    is_excluded(o->dir, o->src_index, name, &dtype))
+	if (o->internal.dir &&
+	    is_excluded(o->internal.dir, o->src_index, name, &dtype))
 		/*
 		 * ce->name is explicitly excluded, so it is Ok to
 		 * overwrite it.
@@ -2420,7 +2430,7 @@
 	 * delete this path, which is in a subdirectory that
 	 * is being replaced with a blob.
 	 */
-	result = index_file_exists(&o->result, name, len, 0);
+	result = index_file_exists(&o->internal.result, name, len, 0);
 	if (result) {
 		if (result->ce_flags & CE_REMOVE)
 			return 0;
@@ -2521,7 +2531,7 @@
 			struct unpack_trees_options *o)
 {
 	int update = CE_UPDATE;
-	struct cache_entry *merge = dup_cache_entry(ce, &o->result);
+	struct cache_entry *merge = dup_cache_entry(ce, &o->internal.result);
 
 	if (!old) {
 		/*
@@ -2616,7 +2626,7 @@
 	setup_traverse_info(&info, src[0]->name);
 	info.fn = unpack_sparse_callback;
 	info.data = o;
-	info.show_all_errors = o->show_all_errors;
+	info.show_all_errors = o->internal.show_all_errors;
 	info.pathspec = o->pathspec;
 
 	/* Get the tree descriptors of the sparse directory in each of the merging trees */
@@ -2834,7 +2844,7 @@
 			return -1;
 	}
 
-	o->nontrivial_merge = 1;
+	o->internal.nontrivial_merge = 1;
 
 	/* #2, #3, #4, #6, #7, #9, #10, #11. */
 	count = 0;
@@ -2875,9 +2885,9 @@
 	const struct cache_entry *oldtree = src[1];
 	const struct cache_entry *newtree = src[2];
 
-	if (o->merge_size != 2)
+	if (o->internal.merge_size != 2)
 		return error("Cannot do a twoway merge of %d trees",
-			     o->merge_size);
+			     o->internal.merge_size);
 
 	if (oldtree == o->df_conflict_entry)
 		oldtree = NULL;
@@ -2957,9 +2967,9 @@
 	const struct cache_entry *old = src[0];
 	const struct cache_entry *a = src[1];
 
-	if (o->merge_size != 1)
+	if (o->internal.merge_size != 1)
 		return error("Cannot do a bind merge of %d trees",
-			     o->merge_size);
+			     o->internal.merge_size);
 	if (a && old)
 		return o->quiet ? -1 :
 			error(ERRORMSG(o, ERROR_BIND_OVERLAP),
@@ -2983,9 +2993,9 @@
 	const struct cache_entry *old = src[0];
 	const struct cache_entry *a = src[1];
 
-	if (o->merge_size != 1)
+	if (o->internal.merge_size != 1)
 		return error("Cannot do a oneway merge of %d trees",
-			     o->merge_size);
+			     o->internal.merge_size);
 
 	if (!a || a == o->df_conflict_entry)
 		return deleted_entry(old, old, o);
@@ -3020,8 +3030,8 @@
 	const struct cache_entry *worktree = src[1];
 	const struct cache_entry *untracked = src[2];
 
-	if (o->merge_size != 2)
-		BUG("invalid merge_size: %d", o->merge_size);
+	if (o->internal.merge_size != 2)
+		BUG("invalid merge_size: %d", o->internal.merge_size);
 
 	if (worktree && untracked)
 		return error(_("worktree and untracked commit have duplicate entries: %s"),
diff --git a/unpack-trees.h b/unpack-trees.h
index 3a7b3e5..61c06eb 100644
--- a/unpack-trees.h
+++ b/unpack-trees.h
@@ -59,47 +59,54 @@
 		     preserve_ignored,
 		     clone,
 		     index_only,
-		     nontrivial_merge,
 		     trivial_merges_only,
 		     verbose_update,
 		     aggressive,
 		     skip_unmerged,
 		     initial_checkout,
 		     diff_index_cached,
-		     debug_unpack,
 		     skip_sparse_checkout,
 		     quiet,
 		     exiting_early,
-		     show_all_errors,
 		     dry_run,
 		     skip_cache_tree_update;
 	enum unpack_trees_reset_type reset;
 	const char *prefix;
 	const char *super_prefix;
-	int cache_bottom;
 	struct pathspec *pathspec;
 	merge_fn_t fn;
-	const char *msgs[NB_UNPACK_TREES_WARNING_TYPES];
-	struct strvec msgs_to_free;
-	/*
-	 * Store error messages in an array, each case
-	 * corresponding to a error message type
-	 */
-	struct string_list unpack_rejects[NB_UNPACK_TREES_WARNING_TYPES];
 
 	int head_idx;
-	int merge_size;
 
-	struct cache_entry *df_conflict_entry;
+	struct cache_entry *df_conflict_entry; /* output only */
 	void *unpack_data;
 
 	struct index_state *dst_index;
 	struct index_state *src_index;
-	struct index_state result;
 
-	struct pattern_list *pl; /* for internal use */
-	struct dir_struct *dir; /* for internal use only */
 	struct checkout_metadata meta;
+
+	struct unpack_trees_options_internal {
+		unsigned int nontrivial_merge,
+			     show_all_errors,
+			     debug_unpack; /* used by read-tree debugging */
+
+		int merge_size; /* used by read-tree debugging */
+		int cache_bottom;
+		const char *msgs[NB_UNPACK_TREES_WARNING_TYPES];
+		struct strvec msgs_to_free;
+
+		/*
+		 * Store error messages in an array, each case
+		 * corresponding to a error message type
+		 */
+		struct string_list unpack_rejects[NB_UNPACK_TREES_WARNING_TYPES];
+
+		struct index_state result;
+
+		struct pattern_list *pl;
+		struct dir_struct *dir;
+	} internal;
 };
 
 int unpack_trees(unsigned n, struct tree_desc *t,
@@ -112,7 +119,8 @@
 	UPDATE_SPARSITY_WORKTREE_UPDATE_FAILURES = -2
 };
 
-enum update_sparsity_result update_sparsity(struct unpack_trees_options *options);
+enum update_sparsity_result update_sparsity(struct unpack_trees_options *options,
+					    struct pattern_list *pl);
 
 int verify_uptodate(const struct cache_entry *ce,
 		    struct unpack_trees_options *o);
diff --git a/upload-pack.c b/upload-pack.c
index 551f22f..41b9362 100644
--- a/upload-pack.c
+++ b/upload-pack.c
@@ -1,5 +1,6 @@
 #include "cache.h"
 #include "config.h"
+#include "hex.h"
 #include "refs.h"
 #include "pkt-line.h"
 #include "sideband.h"
@@ -1699,7 +1700,7 @@
 	FETCH_DONE,
 };
 
-int upload_pack_v2(struct repository *r, struct packet_reader *request)
+int upload_pack_v2(struct repository *r UNUSED, struct packet_reader *request)
 {
 	enum fetch_state state = FETCH_PROCESS_ARGS;
 	struct upload_pack_data data;
@@ -1775,26 +1776,26 @@
 
 		strbuf_addstr(value, "shallow wait-for-done");
 
-		if (!repo_config_get_bool(the_repository,
+		if (!repo_config_get_bool(r,
 					 "uploadpack.allowfilter",
 					 &allow_filter_value) &&
 		    allow_filter_value)
 			strbuf_addstr(value, " filter");
 
-		if (!repo_config_get_bool(the_repository,
+		if (!repo_config_get_bool(r,
 					 "uploadpack.allowrefinwant",
 					 &allow_ref_in_want) &&
 		    allow_ref_in_want)
 			strbuf_addstr(value, " ref-in-want");
 
 		if (git_env_bool("GIT_TEST_SIDEBAND_ALL", 0) ||
-		    (!repo_config_get_bool(the_repository,
+		    (!repo_config_get_bool(r,
 					   "uploadpack.allowsidebandall",
 					   &allow_sideband_all_value) &&
 		     allow_sideband_all_value))
 			strbuf_addstr(value, " sideband-all");
 
-		if (!repo_config_get_string(the_repository,
+		if (!repo_config_get_string(r,
 					    "uploadpack.blobpackfileuri",
 					    &str) &&
 		    str) {
diff --git a/url.c b/url.c
index e04bd60..2e1a9f6 100644
--- a/url.c
+++ b/url.c
@@ -1,4 +1,6 @@
-#include "cache.h"
+#include "git-compat-util.h"
+#include "hex.h"
+#include "strbuf.h"
 #include "url.h"
 
 int is_urlschemechar(int first_flag, int ch)
diff --git a/urlmatch.c b/urlmatch.c
index 620a648..eba0bdd 100644
--- a/urlmatch.c
+++ b/urlmatch.c
@@ -1,4 +1,7 @@
-#include "cache.h"
+#include "git-compat-util.h"
+#include "gettext.h"
+#include "hex.h"
+#include "strbuf.h"
 #include "urlmatch.h"
 
 #define URL_ALPHA "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"
diff --git a/userdiff.c b/userdiff.c
index 58a3d59..09203fb 100644
--- a/userdiff.c
+++ b/userdiff.c
@@ -1,7 +1,9 @@
-#include "cache.h"
+#include "git-compat-util.h"
+#include "alloc.h"
 #include "config.h"
 #include "userdiff.h"
 #include "attr.h"
+#include "strbuf.h"
 
 static struct userdiff_driver *drivers;
 static int ndrivers;
diff --git a/walker.c b/walker.c
index 99d0e0e..c046936 100644
--- a/walker.c
+++ b/walker.c
@@ -1,4 +1,5 @@
 #include "cache.h"
+#include "hex.h"
 #include "walker.h"
 #include "repository.h"
 #include "object-store.h"
diff --git a/wildmatch.c b/wildmatch.c
index 7e5a7ea..42e38e3 100644
--- a/wildmatch.c
+++ b/wildmatch.c
@@ -9,7 +9,7 @@
 **  work differently than '*', and to fix the character-class code.
 */
 
-#include "cache.h"
+#include "git-compat-util.h"
 #include "wildmatch.h"
 
 typedef unsigned char uchar;
diff --git a/worktree.c b/worktree.c
index aa43c64..e10594e 100644
--- a/worktree.c
+++ b/worktree.c
@@ -1,4 +1,5 @@
-#include "cache.h"
+#include "git-compat-util.h"
+#include "alloc.h"
 #include "repository.h"
 #include "refs.h"
 #include "strbuf.h"
@@ -403,44 +404,43 @@
  * bisect). New commands that do similar things should update this
  * function as well.
  */
+int is_shared_symref(const struct worktree *wt, const char *symref,
+		     const char *target)
+{
+	const char *symref_target;
+	struct ref_store *refs;
+	int flags;
+
+	if (wt->is_bare)
+		return 0;
+
+	if (wt->is_detached && !strcmp(symref, "HEAD")) {
+		if (is_worktree_being_rebased(wt, target))
+			return 1;
+		if (is_worktree_being_bisected(wt, target))
+			return 1;
+	}
+
+	refs = get_worktree_ref_store(wt);
+	symref_target = refs_resolve_ref_unsafe(refs, symref, 0,
+						NULL, &flags);
+	if ((flags & REF_ISSYMREF) &&
+	    symref_target && !strcmp(symref_target, target))
+		return 1;
+
+	return 0;
+}
+
 const struct worktree *find_shared_symref(struct worktree **worktrees,
 					  const char *symref,
 					  const char *target)
 {
-	const struct worktree *existing = NULL;
-	int i = 0;
 
-	for (i = 0; worktrees[i]; i++) {
-		struct worktree *wt = worktrees[i];
-		const char *symref_target;
-		struct ref_store *refs;
-		int flags;
+	for (int i = 0; worktrees[i]; i++)
+		if (is_shared_symref(worktrees[i], symref, target))
+			return worktrees[i];
 
-		if (wt->is_bare)
-			continue;
-
-		if (wt->is_detached && !strcmp(symref, "HEAD")) {
-			if (is_worktree_being_rebased(wt, target)) {
-				existing = wt;
-				break;
-			}
-			if (is_worktree_being_bisected(wt, target)) {
-				existing = wt;
-				break;
-			}
-		}
-
-		refs = get_worktree_ref_store(wt);
-		symref_target = refs_resolve_ref_unsafe(refs, symref, 0,
-							NULL, &flags);
-		if ((flags & REF_ISSYMREF) &&
-		    symref_target && !strcmp(symref_target, target)) {
-			existing = wt;
-			break;
-		}
-	}
-
-	return existing;
+	return NULL;
 }
 
 int submodule_uses_worktrees(const char *path)
diff --git a/worktree.h b/worktree.h
index 9dcea6f..ce45b66 100644
--- a/worktree.h
+++ b/worktree.h
@@ -1,7 +1,6 @@
 #ifndef WORKTREE_H
 #define WORKTREE_H
 
-#include "cache.h"
 #include "refs.h"
 
 struct strbuf;
@@ -150,6 +149,12 @@
 					  const char *target);
 
 /*
+ * Returns true if a symref points to a ref in a worktree.
+ */
+int is_shared_symref(const struct worktree *wt,
+		     const char *symref, const char *target);
+
+/*
  * Similar to head_ref() for all HEADs _except_ one from the current
  * worktree, which is covered by head_ref().
  */
diff --git a/wt-status.c b/wt-status.c
index 3162241..90525bd 100644
--- a/wt-status.c
+++ b/wt-status.c
@@ -4,6 +4,7 @@
 #include "dir.h"
 #include "commit.h"
 #include "diff.h"
+#include "hex.h"
 #include "revision.h"
 #include "diffcore.h"
 #include "quote.h"
diff --git a/xdiff-interface.c b/xdiff-interface.c
index e87950d..5baf6ce 100644
--- a/xdiff-interface.c
+++ b/xdiff-interface.c
@@ -1,5 +1,6 @@
 #include "cache.h"
 #include "config.h"
+#include "hex.h"
 #include "object-store.h"
 #include "xdiff-interface.h"
 #include "xdiff/xtypes.h"
diff --git a/xdiff-interface.h b/xdiff-interface.h
index 4301a7e..3750794 100644
--- a/xdiff-interface.h
+++ b/xdiff-interface.h
@@ -1,7 +1,7 @@
 #ifndef XDIFF_INTERFACE_H
 #define XDIFF_INTERFACE_H
 
-#include "cache.h"
+#include "hash.h"
 #include "xdiff/xdiff.h"
 
 /*