builtin/repack.c - git - Git at Google

 #include "builtin.h"
 #include "cache.h"
 #include "dir.h"
 #include "parse-options.h"
 #include "run-command.h"
 #include "sigchain.h"
 #include "strbuf.h"
 #include "string-list.h"
 #include "argv-array.h"

 static int delta_base_offset = 1;
 static int pack_kept_objects = -1;
 static int write_bitmaps;
 static char *packdir, *packtmp;

 static const char *const git_repack_usage[] = {
 	N_("git repack [options]"),
 	NULL
 };

 static int repack_config(const char *var, const char *value, void *cb)
 {
 	if (!strcmp(var, "repack.usedeltabaseoffset")) {
 		delta_base_offset = git_config_bool(var, value);
 		return 0;
 	}
 	if (!strcmp(var, "repack.packkeptobjects")) {
 		pack_kept_objects = git_config_bool(var, value);
 		return 0;
 	}
 	if (!strcmp(var, "repack.writebitmaps") ||
 	    !strcmp(var, "pack.writebitmaps")) {
 		write_bitmaps = git_config_bool(var, value);
 		return 0;
 	}
 	return git_default_config(var, value, cb);
 }

 /*
  * Remove temporary $GIT_OBJECT_DIRECTORY/pack/.tmp-$$-pack-* files.
  */
 static void remove_temporary_files(void)
 {
 	struct strbuf buf = STRBUF_INIT;
 	size_t dirlen, prefixlen;
 	DIR *dir;
 	struct dirent *e;

 	dir = opendir(packdir);
 	if (!dir)
 		return;

 	/* Point at the slash at the end of ".../objects/pack/" */
 	dirlen = strlen(packdir) + 1;
 	strbuf_addstr(&buf, packtmp);
 	/* Hold the length of  ".tmp-%d-pack-" */
 	prefixlen = buf.len - dirlen;

 	while ((e = readdir(dir))) {
 		if (strncmp(e->d_name, buf.buf + dirlen, prefixlen))
 			continue;
 		strbuf_setlen(&buf, dirlen);
 		strbuf_addstr(&buf, e->d_name);
 		unlink(buf.buf);
 	}
 	closedir(dir);
 	strbuf_release(&buf);
 }

 static void remove_pack_on_signal(int signo)
 {
 	remove_temporary_files();
 	sigchain_pop(signo);
 	raise(signo);
 }

 /*
  * Adds all packs hex strings to the fname list, which do not
  * have a corresponding .keep file.
  */
 static void get_non_kept_pack_filenames(struct string_list *fname_list)
 {
 	DIR *dir;
 	struct dirent *e;
 	char *fname;

 	if (!(dir = opendir(packdir)))
 		return;

 	while ((e = readdir(dir)) != NULL) {
 		size_t len;
 		if (!strip_suffix(e->d_name, ".pack", &len))
 			continue;

 		fname = xmemdupz(e->d_name, len);

 		if (!file_exists(mkpath("%s/%s.keep", packdir, fname)))
 			string_list_append_nodup(fname_list, fname);
 		else
 			free(fname);
 	}
 	closedir(dir);
 }

 static void remove_redundant_pack(const char *dir_name, const char *base_name)
 {
 	const char *exts[] = {".pack", ".idx", ".keep", ".bitmap"};
 	int i;
 	struct strbuf buf = STRBUF_INIT;
 	size_t plen;

 	strbuf_addf(&buf, "%s/%s", dir_name, base_name);
 	plen = buf.len;

 	for (i = 0; i < ARRAY_SIZE(exts); i++) {
 		strbuf_setlen(&buf, plen);
 		strbuf_addstr(&buf, exts[i]);
 		unlink(buf.buf);
 	}
 	strbuf_release(&buf);
 }

 #define ALL_INTO_ONE 1
 #define LOOSEN_UNREACHABLE 2

 int cmd_repack(int argc, const char **argv, const char *prefix)
 {
 	struct {
 		const char *name;
 		unsigned optional:1;
 	} exts[] = {
 		{".pack"},
 		{".idx"},
 		{".bitmap", 1},
 	};
 	struct child_process cmd = CHILD_PROCESS_INIT;
 	struct string_list_item *item;
 	struct argv_array cmd_args = ARGV_ARRAY_INIT;
 	struct string_list names = STRING_LIST_INIT_DUP;
 	struct string_list rollback = STRING_LIST_INIT_NODUP;
 	struct string_list existing_packs = STRING_LIST_INIT_DUP;
 	struct strbuf line = STRBUF_INIT;
 	int ext, ret, failed;
 	FILE *out;

 	/* variables to be filled by option parsing */
 	int pack_everything = 0;
 	int delete_redundant = 0;
 	const char *unpack_unreachable = NULL;
 	const char *window = NULL, *window_memory = NULL;
 	const char *depth = NULL;
 	const char *max_pack_size = NULL;
 	int no_reuse_delta = 0, no_reuse_object = 0;
 	int no_update_server_info = 0;
 	int quiet = 0;
 	int local = 0;

 	struct option builtin_repack_options[] = {
 		OPT_BIT('a', NULL, &pack_everything,
 				N_("pack everything in a single pack"), ALL_INTO_ONE),
 		OPT_BIT('A', NULL, &pack_everything,
 				N_("same as -a, and turn unreachable objects loose"),
 				   LOOSEN_UNREACHABLE | ALL_INTO_ONE),
 		OPT_BOOL('d', NULL, &delete_redundant,
 				N_("remove redundant packs, and run git-prune-packed")),
 		OPT_BOOL('f', NULL, &no_reuse_delta,
 				N_("pass --no-reuse-delta to git-pack-objects")),
 		OPT_BOOL('F', NULL, &no_reuse_object,
 				N_("pass --no-reuse-object to git-pack-objects")),
 		OPT_BOOL('n', NULL, &no_update_server_info,
 				N_("do not run git-update-server-info")),
 		OPT__QUIET(&quiet, N_("be quiet")),
 		OPT_BOOL('l', "local", &local,
 				N_("pass --local to git-pack-objects")),
 		OPT_BOOL('b', "write-bitmap-index", &write_bitmaps,
 				N_("write bitmap index")),
 		OPT_STRING(0, "unpack-unreachable", &unpack_unreachable, N_("approxidate"),
 				N_("with -A, do not loosen objects older than this")),
 		OPT_STRING(0, "window", &window, N_("n"),
 				N_("size of the window used for delta compression")),
 		OPT_STRING(0, "window-memory", &window_memory, N_("bytes"),
 				N_("same as the above, but limit memory size instead of entries count")),
 		OPT_STRING(0, "depth", &depth, N_("n"),
 				N_("limits the maximum delta depth")),
 		OPT_STRING(0, "max-pack-size", &max_pack_size, N_("bytes"),
 				N_("maximum size of each packfile")),
 		OPT_BOOL(0, "pack-kept-objects", &pack_kept_objects,
 				N_("repack objects in packs marked with .keep")),
 		OPT_END()
 	};

 	git_config(repack_config, NULL);

 	argc = parse_options(argc, argv, prefix, builtin_repack_options,
 				git_repack_usage, 0);

 	if (pack_kept_objects < 0)
 		pack_kept_objects = write_bitmaps;

 	packdir = mkpathdup("%s/pack", get_object_directory());
 	packtmp = mkpathdup("%s/.tmp-%d-pack", packdir, (int)getpid());

 	sigchain_push_common(remove_pack_on_signal);

 	argv_array_push(&cmd_args, "pack-objects");
 	argv_array_push(&cmd_args, "--keep-true-parents");
 	if (!pack_kept_objects)
 		argv_array_push(&cmd_args, "--honor-pack-keep");
 	argv_array_push(&cmd_args, "--non-empty");
 	argv_array_push(&cmd_args, "--all");
 	argv_array_push(&cmd_args, "--reflog");
 	argv_array_push(&cmd_args, "--indexed-objects");
 	if (window)
 		argv_array_pushf(&cmd_args, "--window=%s", window);
 	if (window_memory)
 		argv_array_pushf(&cmd_args, "--window-memory=%s", window_memory);
 	if (depth)
 		argv_array_pushf(&cmd_args, "--depth=%s", depth);
 	if (max_pack_size)
 		argv_array_pushf(&cmd_args, "--max-pack-size=%s", max_pack_size);
 	if (no_reuse_delta)
 		argv_array_pushf(&cmd_args, "--no-reuse-delta");
 	if (no_reuse_object)
 		argv_array_pushf(&cmd_args, "--no-reuse-object");
 	if (write_bitmaps)
 		argv_array_push(&cmd_args, "--write-bitmap-index");

 	if (pack_everything & ALL_INTO_ONE) {
 		get_non_kept_pack_filenames(&existing_packs);

 		if (existing_packs.nr && delete_redundant) {
 			if (unpack_unreachable)
 				argv_array_pushf(&cmd_args,
 						"--unpack-unreachable=%s",
 						unpack_unreachable);
 			else if (pack_everything & LOOSEN_UNREACHABLE)
 				argv_array_push(&cmd_args,
 						"--unpack-unreachable");
 		}
 	} else {
 		argv_array_push(&cmd_args, "--unpacked");
 		argv_array_push(&cmd_args, "--incremental");
 	}

 	if (local)
 		argv_array_push(&cmd_args,  "--local");
 	if (quiet)
 		argv_array_push(&cmd_args,  "--quiet");
 	if (delta_base_offset)
 		argv_array_push(&cmd_args,  "--delta-base-offset");

 	argv_array_push(&cmd_args, packtmp);

 	cmd.argv = cmd_args.argv;
 	cmd.git_cmd = 1;
 	cmd.out = -1;
 	cmd.no_stdin = 1;

 	ret = start_command(&cmd);
 	if (ret)
 		return ret;

 	out = xfdopen(cmd.out, "r");
 	while (strbuf_getline(&line, out, '\n') != EOF) {
 		if (line.len != 40)
 			die("repack: Expecting 40 character sha1 lines only from pack-objects.");
 		string_list_append(&names, line.buf);
 	}
 	fclose(out);
 	ret = finish_command(&cmd);
 	if (ret)
 		return ret;
 	argv_array_clear(&cmd_args);

 	if (!names.nr && !quiet)
 		printf("Nothing new to pack.\n");

 	/*
 	 * Ok we have prepared all new packfiles.
 	 * First see if there are packs of the same name and if so
 	 * if we can move them out of the way (this can happen if we
 	 * repacked immediately after packing fully.
 	 */
 	failed = 0;
 	for_each_string_list_item(item, &names) {
 		for (ext = 0; ext < ARRAY_SIZE(exts); ext++) {
 			char *fname, *fname_old;
 			fname = mkpathdup("%s/pack-%s%s", packdir,
 						item->string, exts[ext].name);
 			if (!file_exists(fname)) {
 				free(fname);
 				continue;
 			}

 			fname_old = mkpath("%s/old-%s%s", packdir,
 						item->string, exts[ext].name);
 			if (file_exists(fname_old))
 				if (unlink(fname_old))
 					failed = 1;

 			if (!failed && rename(fname, fname_old)) {
 				free(fname);
 				failed = 1;
 				break;
 			} else {
 				string_list_append(&rollback, fname);
 			}
 		}
 		if (failed)
 			break;
 	}
 	if (failed) {
 		struct string_list rollback_failure = STRING_LIST_INIT_DUP;
 		for_each_string_list_item(item, &rollback) {
 			char *fname, *fname_old;
 			fname = mkpathdup("%s/%s", packdir, item->string);
 			fname_old = mkpath("%s/old-%s", packdir, item->string);
 			if (rename(fname_old, fname))
 				string_list_append(&rollback_failure, fname);
 			free(fname);
 		}

 		if (rollback_failure.nr) {
 			int i;
 			fprintf(stderr,
 				"WARNING: Some packs in use have been renamed by\n"
 				"WARNING: prefixing old- to their name, in order to\n"
 				"WARNING: replace them with the new version of the\n"
 				"WARNING: file.  But the operation failed, and the\n"
 				"WARNING: attempt to rename them back to their\n"
 				"WARNING: original names also failed.\n"
 				"WARNING: Please rename them in %s manually:\n", packdir);
 			for (i = 0; i < rollback_failure.nr; i++)
 				fprintf(stderr, "WARNING:   old-%s -> %s\n",
 					rollback_failure.items[i].string,
 					rollback_failure.items[i].string);
 		}
 		exit(1);
 	}

 	/* Now the ones with the same name are out of the way... */
 	for_each_string_list_item(item, &names) {
 		for (ext = 0; ext < ARRAY_SIZE(exts); ext++) {
 			char *fname, *fname_old;
 			struct stat statbuffer;
 			int exists = 0;
 			fname = mkpathdup("%s/pack-%s%s",
 					packdir, item->string, exts[ext].name);
 			fname_old = mkpathdup("%s-%s%s",
 					packtmp, item->string, exts[ext].name);
 			if (!stat(fname_old, &statbuffer)) {
 				statbuffer.st_mode &= ~(S_IWUSR | S_IWGRP | S_IWOTH);
 				chmod(fname_old, statbuffer.st_mode);
 				exists = 1;
 			}
 			if (exists || !exts[ext].optional) {
 				if (rename(fname_old, fname))
 					die_errno(_("renaming '%s' failed"), fname_old);
 			}
 			free(fname);
 			free(fname_old);
 		}
 	}

 	/* Remove the "old-" files */
 	for_each_string_list_item(item, &names) {
 		for (ext = 0; ext < ARRAY_SIZE(exts); ext++) {
 			char *fname;
 			fname = mkpath("%s/old-%s%s",
 					packdir,
 					item->string,
 					exts[ext].name);
 			if (remove_path(fname))
 				warning(_("removing '%s' failed"), fname);
 		}
 	}

 	/* End of pack replacement. */

 	if (delete_redundant) {
 		int opts = 0;
 		sort_string_list(&names);
 		for_each_string_list_item(item, &existing_packs) {
 			char *sha1;
 			size_t len = strlen(item->string);
 			if (len < 40)
 				continue;
 			sha1 = item->string + len - 40;
 			if (!string_list_has_string(&names, sha1))
 				remove_redundant_pack(packdir, item->string);
 		}
 		if (!quiet && isatty(2))
 			opts |= PRUNE_PACKED_VERBOSE;
 		prune_packed_objects(opts);
 	}

 	if (!no_update_server_info)
 		update_server_info(0);
 	remove_temporary_files();
 	string_list_clear(&names, 0);
 	string_list_clear(&rollback, 0);
 	string_list_clear(&existing_packs, 0);
 	strbuf_release(&line);

 	return 0;
 }
	#include "builtin.h"
	#include "cache.h"
	#include "dir.h"
	#include "parse-options.h"
	#include "run-command.h"
	#include "sigchain.h"
	#include "strbuf.h"
	#include "string-list.h"
	#include "argv-array.h"

	static int delta_base_offset = 1;
	static int pack_kept_objects = -1;
	static int write_bitmaps;
	static char packdir, packtmp;

	static const char *const git_repack_usage[] = {
	N_("git repack [options]"),
	NULL
	};

	static int repack_config(const char var, const char value, void *cb)
	{
	if (!strcmp(var, "repack.usedeltabaseoffset")) {
	delta_base_offset = git_config_bool(var, value);
	return 0;
	}
	if (!strcmp(var, "repack.packkeptobjects")) {
	pack_kept_objects = git_config_bool(var, value);
	return 0;
	}
	if (!strcmp(var, "repack.writebitmaps") \|\|
	!strcmp(var, "pack.writebitmaps")) {
	write_bitmaps = git_config_bool(var, value);
	return 0;
	}
	return git_default_config(var, value, cb);
	}

	/*
	* Remove temporary $GIT_OBJECT_DIRECTORY/pack/.tmp-$$-pack-* files.
	*/
	static void remove_temporary_files(void)
	{
	struct strbuf buf = STRBUF_INIT;
	size_t dirlen, prefixlen;
	DIR *dir;
	struct dirent *e;

	dir = opendir(packdir);
	if (!dir)
	return;

	/* Point at the slash at the end of ".../objects/pack/" */
	dirlen = strlen(packdir) + 1;
	strbuf_addstr(&buf, packtmp);
	/* Hold the length of ".tmp-%d-pack-" */
	prefixlen = buf.len - dirlen;

	while ((e = readdir(dir))) {
	if (strncmp(e->d_name, buf.buf + dirlen, prefixlen))
	continue;
	strbuf_setlen(&buf, dirlen);
	strbuf_addstr(&buf, e->d_name);
	unlink(buf.buf);
	}
	closedir(dir);
	strbuf_release(&buf);
	}

	static void remove_pack_on_signal(int signo)
	{
	remove_temporary_files();
	sigchain_pop(signo);
	raise(signo);
	}

	/*
	* Adds all packs hex strings to the fname list, which do not
	* have a corresponding .keep file.
	*/
	static void get_non_kept_pack_filenames(struct string_list *fname_list)
	{
	DIR *dir;
	struct dirent *e;
	char *fname;

	if (!(dir = opendir(packdir)))
	return;

	while ((e = readdir(dir)) != NULL) {
	size_t len;
	if (!strip_suffix(e->d_name, ".pack", &len))
	continue;

	fname = xmemdupz(e->d_name, len);

	if (!file_exists(mkpath("%s/%s.keep", packdir, fname)))
	string_list_append_nodup(fname_list, fname);
	else
	free(fname);
	}
	closedir(dir);
	}

	static void remove_redundant_pack(const char dir_name, const char base_name)
	{
	const char *exts[] = {".pack", ".idx", ".keep", ".bitmap"};
	int i;
	struct strbuf buf = STRBUF_INIT;
	size_t plen;

	strbuf_addf(&buf, "%s/%s", dir_name, base_name);
	plen = buf.len;

	for (i = 0; i < ARRAY_SIZE(exts); i++) {
	strbuf_setlen(&buf, plen);
	strbuf_addstr(&buf, exts[i]);
	unlink(buf.buf);
	}
	strbuf_release(&buf);
	}

	#define ALL_INTO_ONE 1
	#define LOOSEN_UNREACHABLE 2

	int cmd_repack(int argc, const char *argv, const char prefix)
	{
	struct {
	const char *name;
	unsigned optional:1;
	} exts[] = {
	{".pack"},
	{".idx"},
	{".bitmap", 1},
	};
	struct child_process cmd = CHILD_PROCESS_INIT;
	struct string_list_item *item;
	struct argv_array cmd_args = ARGV_ARRAY_INIT;
	struct string_list names = STRING_LIST_INIT_DUP;
	struct string_list rollback = STRING_LIST_INIT_NODUP;
	struct string_list existing_packs = STRING_LIST_INIT_DUP;
	struct strbuf line = STRBUF_INIT;
	int ext, ret, failed;
	FILE *out;

	/* variables to be filled by option parsing */
	int pack_everything = 0;
	int delete_redundant = 0;
	const char *unpack_unreachable = NULL;
	const char window = NULL, window_memory = NULL;
	const char *depth = NULL;
	const char *max_pack_size = NULL;
	int no_reuse_delta = 0, no_reuse_object = 0;
	int no_update_server_info = 0;
	int quiet = 0;
	int local = 0;

	struct option builtin_repack_options[] = {
	OPT_BIT('a', NULL, &pack_everything,
	N_("pack everything in a single pack"), ALL_INTO_ONE),
	OPT_BIT('A', NULL, &pack_everything,
	N_("same as -a, and turn unreachable objects loose"),
	LOOSEN_UNREACHABLE \| ALL_INTO_ONE),
	OPT_BOOL('d', NULL, &delete_redundant,
	N_("remove redundant packs, and run git-prune-packed")),
	OPT_BOOL('f', NULL, &no_reuse_delta,
	N_("pass --no-reuse-delta to git-pack-objects")),
	OPT_BOOL('F', NULL, &no_reuse_object,
	N_("pass --no-reuse-object to git-pack-objects")),
	OPT_BOOL('n', NULL, &no_update_server_info,
	N_("do not run git-update-server-info")),
	OPT__QUIET(&quiet, N_("be quiet")),
	OPT_BOOL('l', "local", &local,
	N_("pass --local to git-pack-objects")),
	OPT_BOOL('b', "write-bitmap-index", &write_bitmaps,
	N_("write bitmap index")),
	OPT_STRING(0, "unpack-unreachable", &unpack_unreachable, N_("approxidate"),
	N_("with -A, do not loosen objects older than this")),
	OPT_STRING(0, "window", &window, N_("n"),
	N_("size of the window used for delta compression")),
	OPT_STRING(0, "window-memory", &window_memory, N_("bytes"),
	N_("same as the above, but limit memory size instead of entries count")),
	OPT_STRING(0, "depth", &depth, N_("n"),
	N_("limits the maximum delta depth")),
	OPT_STRING(0, "max-pack-size", &max_pack_size, N_("bytes"),
	N_("maximum size of each packfile")),
	OPT_BOOL(0, "pack-kept-objects", &pack_kept_objects,
	N_("repack objects in packs marked with .keep")),
	OPT_END()
	};

	git_config(repack_config, NULL);

	argc = parse_options(argc, argv, prefix, builtin_repack_options,
	git_repack_usage, 0);

	if (pack_kept_objects < 0)
	pack_kept_objects = write_bitmaps;

	packdir = mkpathdup("%s/pack", get_object_directory());
	packtmp = mkpathdup("%s/.tmp-%d-pack", packdir, (int)getpid());

	sigchain_push_common(remove_pack_on_signal);

	argv_array_push(&cmd_args, "pack-objects");
	argv_array_push(&cmd_args, "--keep-true-parents");
	if (!pack_kept_objects)
	argv_array_push(&cmd_args, "--honor-pack-keep");
	argv_array_push(&cmd_args, "--non-empty");
	argv_array_push(&cmd_args, "--all");
	argv_array_push(&cmd_args, "--reflog");
	argv_array_push(&cmd_args, "--indexed-objects");
	if (window)
	argv_array_pushf(&cmd_args, "--window=%s", window);
	if (window_memory)
	argv_array_pushf(&cmd_args, "--window-memory=%s", window_memory);
	if (depth)
	argv_array_pushf(&cmd_args, "--depth=%s", depth);
	if (max_pack_size)
	argv_array_pushf(&cmd_args, "--max-pack-size=%s", max_pack_size);
	if (no_reuse_delta)
	argv_array_pushf(&cmd_args, "--no-reuse-delta");
	if (no_reuse_object)
	argv_array_pushf(&cmd_args, "--no-reuse-object");
	if (write_bitmaps)
	argv_array_push(&cmd_args, "--write-bitmap-index");

	if (pack_everything & ALL_INTO_ONE) {
	get_non_kept_pack_filenames(&existing_packs);

	if (existing_packs.nr && delete_redundant) {
	if (unpack_unreachable)
	argv_array_pushf(&cmd_args,
	"--unpack-unreachable=%s",
	unpack_unreachable);
	else if (pack_everything & LOOSEN_UNREACHABLE)
	argv_array_push(&cmd_args,
	"--unpack-unreachable");
	}
	} else {
	argv_array_push(&cmd_args, "--unpacked");
	argv_array_push(&cmd_args, "--incremental");
	}

	if (local)
	argv_array_push(&cmd_args, "--local");
	if (quiet)
	argv_array_push(&cmd_args, "--quiet");
	if (delta_base_offset)
	argv_array_push(&cmd_args, "--delta-base-offset");

	argv_array_push(&cmd_args, packtmp);

	cmd.argv = cmd_args.argv;
	cmd.git_cmd = 1;
	cmd.out = -1;
	cmd.no_stdin = 1;

	ret = start_command(&cmd);
	if (ret)
	return ret;

	out = xfdopen(cmd.out, "r");
	while (strbuf_getline(&line, out, '\n') != EOF) {
	if (line.len != 40)
	die("repack: Expecting 40 character sha1 lines only from pack-objects.");
	string_list_append(&names, line.buf);
	}
	fclose(out);
	ret = finish_command(&cmd);
	if (ret)
	return ret;
	argv_array_clear(&cmd_args);

	if (!names.nr && !quiet)
	printf("Nothing new to pack.\n");

	/*
	* Ok we have prepared all new packfiles.
	* First see if there are packs of the same name and if so
	* if we can move them out of the way (this can happen if we
	* repacked immediately after packing fully.
	*/
	failed = 0;
	for_each_string_list_item(item, &names) {
	for (ext = 0; ext < ARRAY_SIZE(exts); ext++) {
	char fname, fname_old;
	fname = mkpathdup("%s/pack-%s%s", packdir,
	item->string, exts[ext].name);
	if (!file_exists(fname)) {
	free(fname);
	continue;
	}

	fname_old = mkpath("%s/old-%s%s", packdir,
	item->string, exts[ext].name);
	if (file_exists(fname_old))
	if (unlink(fname_old))
	failed = 1;

	if (!failed && rename(fname, fname_old)) {
	free(fname);
	failed = 1;
	break;
	} else {
	string_list_append(&rollback, fname);
	}
	}
	if (failed)
	break;
	}
	if (failed) {
	struct string_list rollback_failure = STRING_LIST_INIT_DUP;
	for_each_string_list_item(item, &rollback) {
	char fname, fname_old;
	fname = mkpathdup("%s/%s", packdir, item->string);
	fname_old = mkpath("%s/old-%s", packdir, item->string);
	if (rename(fname_old, fname))
	string_list_append(&rollback_failure, fname);
	free(fname);
	}

	if (rollback_failure.nr) {
	int i;
	fprintf(stderr,
	"WARNING: Some packs in use have been renamed by\n"
	"WARNING: prefixing old- to their name, in order to\n"
	"WARNING: replace them with the new version of the\n"
	"WARNING: file. But the operation failed, and the\n"
	"WARNING: attempt to rename them back to their\n"
	"WARNING: original names also failed.\n"
	"WARNING: Please rename them in %s manually:\n", packdir);
	for (i = 0; i < rollback_failure.nr; i++)
	fprintf(stderr, "WARNING: old-%s -> %s\n",
	rollback_failure.items[i].string,
	rollback_failure.items[i].string);
	}
	exit(1);
	}

	/* Now the ones with the same name are out of the way... */
	for_each_string_list_item(item, &names) {
	for (ext = 0; ext < ARRAY_SIZE(exts); ext++) {
	char fname, fname_old;
	struct stat statbuffer;
	int exists = 0;
	fname = mkpathdup("%s/pack-%s%s",
	packdir, item->string, exts[ext].name);
	fname_old = mkpathdup("%s-%s%s",
	packtmp, item->string, exts[ext].name);
	if (!stat(fname_old, &statbuffer)) {
	statbuffer.st_mode &= ~(S_IWUSR \| S_IWGRP \| S_IWOTH);
	chmod(fname_old, statbuffer.st_mode);
	exists = 1;
	}
	if (exists \|\| !exts[ext].optional) {
	if (rename(fname_old, fname))
	die_errno(_("renaming '%s' failed"), fname_old);
	}
	free(fname);
	free(fname_old);
	}
	}

	/* Remove the "old-" files */
	for_each_string_list_item(item, &names) {
	for (ext = 0; ext < ARRAY_SIZE(exts); ext++) {
	char *fname;
	fname = mkpath("%s/old-%s%s",
	packdir,
	item->string,
	exts[ext].name);
	if (remove_path(fname))
	warning(_("removing '%s' failed"), fname);
	}
	}

	/* End of pack replacement. */

	if (delete_redundant) {
	int opts = 0;
	sort_string_list(&names);
	for_each_string_list_item(item, &existing_packs) {
	char *sha1;
	size_t len = strlen(item->string);
	if (len < 40)
	continue;
	sha1 = item->string + len - 40;
	if (!string_list_has_string(&names, sha1))
	remove_redundant_pack(packdir, item->string);
	}
	if (!quiet && isatty(2))
	opts \|= PRUNE_PACKED_VERBOSE;
	prune_packed_objects(opts);
	}

	if (!no_update_server_info)
	update_server_info(0);
	remove_temporary_files();
	string_list_clear(&names, 0);
	string_list_clear(&rollback, 0);
	string_list_clear(&existing_packs, 0);
	strbuf_release(&line);

	return 0;
	}