builtin-send-pack.c - git - Git at Google

 #include "cache.h"
 #include "commit.h"
 #include "tag.h"
 #include "refs.h"
 #include "pkt-line.h"
 #include "run-command.h"
 #include "remote.h"
 #include "send-pack.h"

 static const char send_pack_usage[] =
 "git-send-pack [--all | --mirror] [--dry-run] [--force] [--receive-pack=<git-receive-pack>] [--verbose] [--thin] [<host>:]<directory> [<ref>...]\n"
 "  --all and explicit <ref> specification are mutually exclusive.";

 static struct send_pack_args args = {
 	/* .receivepack = */ "git-receive-pack",
 };

 /*
  * Make a pack stream and spit it out into file descriptor fd
  */
 static int pack_objects(int fd, struct ref *refs)
 {
 	/*
 	 * The child becomes pack-objects --revs; we feed
 	 * the revision parameters to it via its stdin and
 	 * let its stdout go back to the other end.
 	 */
 	const char *argv[] = {
 		"pack-objects",
 		"--all-progress",
 		"--revs",
 		"--stdout",
 		NULL,
 		NULL,
 	};
 	struct child_process po;

 	if (args.use_thin_pack)
 		argv[4] = "--thin";
 	memset(&po, 0, sizeof(po));
 	po.argv = argv;
 	po.in = -1;
 	po.out = fd;
 	po.git_cmd = 1;
 	if (start_command(&po))
 		die("git-pack-objects failed (%s)", strerror(errno));

 	/*
 	 * We feed the pack-objects we just spawned with revision
 	 * parameters by writing to the pipe.
 	 */
 	while (refs) {
 		char buf[42];

 		if (!is_null_sha1(refs->old_sha1) &&
 		    has_sha1_file(refs->old_sha1)) {
 			memcpy(buf + 1, sha1_to_hex(refs->old_sha1), 40);
 			buf[0] = '^';
 			buf[41] = '\n';
 			if (!write_or_whine(po.in, buf, 42,
 						"send-pack: send refs"))
 				break;
 		}
 		if (!is_null_sha1(refs->new_sha1)) {
 			memcpy(buf, sha1_to_hex(refs->new_sha1), 40);
 			buf[40] = '\n';
 			if (!write_or_whine(po.in, buf, 41,
 						"send-pack: send refs"))
 				break;
 		}
 		refs = refs->next;
 	}

 	close(po.in);
 	if (finish_command(&po))
 		return error("pack-objects died with strange error");
 	return 0;
 }

 static void unmark_and_free(struct commit_list *list, unsigned int mark)
 {
 	while (list) {
 		struct commit_list *temp = list;
 		temp->item->object.flags &= ~mark;
 		list = temp->next;
 		free(temp);
 	}
 }

 static int ref_newer(const unsigned char *new_sha1,
 		     const unsigned char *old_sha1)
 {
 	struct object *o;
 	struct commit *old, *new;
 	struct commit_list *list, *used;
 	int found = 0;

 	/* Both new and old must be commit-ish and new is descendant of
 	 * old.  Otherwise we require --force.
 	 */
 	o = deref_tag(parse_object(old_sha1), NULL, 0);
 	if (!o || o->type != OBJ_COMMIT)
 		return 0;
 	old = (struct commit *) o;

 	o = deref_tag(parse_object(new_sha1), NULL, 0);
 	if (!o || o->type != OBJ_COMMIT)
 		return 0;
 	new = (struct commit *) o;

 	if (parse_commit(new) < 0)
 		return 0;

 	used = list = NULL;
 	commit_list_insert(new, &list);
 	while (list) {
 		new = pop_most_recent_commit(&list, 1);
 		commit_list_insert(new, &used);
 		if (new == old) {
 			found = 1;
 			break;
 		}
 	}
 	unmark_and_free(list, 1);
 	unmark_and_free(used, 1);
 	return found;
 }

 static struct ref *local_refs, **local_tail;
 static struct ref *remote_refs, **remote_tail;

 static int one_local_ref(const char *refname, const unsigned char *sha1, int flag, void *cb_data)
 {
 	struct ref *ref;
 	int len = strlen(refname) + 1;
 	ref = xcalloc(1, sizeof(*ref) + len);
 	hashcpy(ref->new_sha1, sha1);
 	memcpy(ref->name, refname, len);
 	*local_tail = ref;
 	local_tail = &ref->next;
 	return 0;
 }

 static void get_local_heads(void)
 {
 	local_tail = &local_refs;
 	for_each_ref(one_local_ref, NULL);
 }

 static int receive_status(int in, struct ref *refs)
 {
 	struct ref *hint;
 	char line[1000];
 	int ret = 0;
 	int len = packet_read_line(in, line, sizeof(line));
 	if (len < 10 || memcmp(line, "unpack ", 7))
 		return error("did not receive remote status");
 	if (memcmp(line, "unpack ok\n", 10)) {
 		char *p = line + strlen(line) - 1;
 		if (*p == '\n')
 			*p = '\0';
 		error("unpack failed: %s", line + 7);
 		ret = -1;
 	}
 	hint = NULL;
 	while (1) {
 		char *refname;
 		char *msg;
 		len = packet_read_line(in, line, sizeof(line));
 		if (!len)
 			break;
 		if (len < 3 ||
 		    (memcmp(line, "ok ", 3) && memcmp(line, "ng ", 3))) {
 			fprintf(stderr, "protocol error: %s\n", line);
 			ret = -1;
 			break;
 		}

 		line[strlen(line)-1] = '\0';
 		refname = line + 3;
 		msg = strchr(refname, ' ');
 		if (msg)
 			*msg++ = '\0';

 		/* first try searching at our hint, falling back to all refs */
 		if (hint)
 			hint = find_ref_by_name(hint, refname);
 		if (!hint)
 			hint = find_ref_by_name(refs, refname);
 		if (!hint) {
 			warning("remote reported status on unknown ref: %s",
 					refname);
 			continue;
 		}
 		if (hint->status != REF_STATUS_EXPECTING_REPORT) {
 			warning("remote reported status on unexpected ref: %s",
 					refname);
 			continue;
 		}

 		if (line[0] == 'o' && line[1] == 'k')
 			hint->status = REF_STATUS_OK;
 		else {
 			hint->status = REF_STATUS_REMOTE_REJECT;
 			ret = -1;
 		}
 		if (msg)
 			hint->remote_status = xstrdup(msg);
 		/* start our next search from the next ref */
 		hint = hint->next;
 	}
 	return ret;
 }

 static void update_tracking_ref(struct remote *remote, struct ref *ref)
 {
 	struct refspec rs;

 	if (ref->status != REF_STATUS_OK)
 		return;

 	rs.src = ref->name;
 	rs.dst = NULL;

 	if (!remote_find_tracking(remote, &rs)) {
 		if (args.verbose)
 			fprintf(stderr, "updating local tracking ref '%s'\n", rs.dst);
 		if (ref->deletion) {
 			if (delete_ref(rs.dst, NULL))
 				error("Failed to delete");
 		} else
 			update_ref("update by push", rs.dst,
 					ref->new_sha1, NULL, 0, 0);
 		free(rs.dst);
 	}
 }

 static const char *prettify_ref(const struct ref *ref)
 {
 	const char *name = ref->name;
 	return name + (
 		!prefixcmp(name, "refs/heads/") ? 11 :
 		!prefixcmp(name, "refs/tags/") ? 10 :
 		!prefixcmp(name, "refs/remotes/") ? 13 :
 		0);
 }

 #define SUMMARY_WIDTH (2 * DEFAULT_ABBREV + 3)

 static void print_ref_status(char flag, const char *summary, struct ref *to, struct ref *from, const char *msg)
 {
 	fprintf(stderr, " %c %-*s ", flag, SUMMARY_WIDTH, summary);
 	if (from)
 		fprintf(stderr, "%s -> %s", prettify_ref(from), prettify_ref(to));
 	else
 		fputs(prettify_ref(to), stderr);
 	if (msg) {
 		fputs(" (", stderr);
 		fputs(msg, stderr);
 		fputc(')', stderr);
 	}
 	fputc('\n', stderr);
 }

 static const char *status_abbrev(unsigned char sha1[20])
 {
 	return find_unique_abbrev(sha1, DEFAULT_ABBREV);
 }

 static void print_ok_ref_status(struct ref *ref)
 {
 	if (ref->deletion)
 		print_ref_status('-', "[deleted]", ref, NULL, NULL);
 	else if (is_null_sha1(ref->old_sha1))
 		print_ref_status('*',
 			(!prefixcmp(ref->name, "refs/tags/") ? "[new tag]" :
 			  "[new branch]"),
 			ref, ref->peer_ref, NULL);
 	else {
 		char quickref[84];
 		char type;
 		const char *msg;

 		strcpy(quickref, status_abbrev(ref->old_sha1));
 		if (ref->nonfastforward) {
 			strcat(quickref, "...");
 			type = '+';
 			msg = "forced update";
 		} else {
 			strcat(quickref, "..");
 			type = ' ';
 			msg = NULL;
 		}
 		strcat(quickref, status_abbrev(ref->new_sha1));

 		print_ref_status(type, quickref, ref, ref->peer_ref, msg);
 	}
 }

 static int print_one_push_status(struct ref *ref, const char *dest, int count)
 {
 	if (!count)
 		fprintf(stderr, "To %s\n", dest);

 	switch(ref->status) {
 	case REF_STATUS_NONE:
 		print_ref_status('X', "[no match]", ref, NULL, NULL);
 		break;
 	case REF_STATUS_REJECT_NODELETE:
 		print_ref_status('!', "[rejected]", ref, NULL,
 				"remote does not support deleting refs");
 		break;
 	case REF_STATUS_UPTODATE:
 		print_ref_status('=', "[up to date]", ref,
 				ref->peer_ref, NULL);
 		break;
 	case REF_STATUS_REJECT_NONFASTFORWARD:
 		print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 				"non-fast forward");
 		break;
 	case REF_STATUS_REMOTE_REJECT:
 		print_ref_status('!', "[remote rejected]", ref,
 				ref->deletion ? NULL : ref->peer_ref,
 				ref->remote_status);
 		break;
 	case REF_STATUS_EXPECTING_REPORT:
 		print_ref_status('!', "[remote failure]", ref,
 				ref->deletion ? NULL : ref->peer_ref,
 				"remote failed to report status");
 		break;
 	case REF_STATUS_OK:
 		print_ok_ref_status(ref);
 		break;
 	}

 	return 1;
 }

 static void print_push_status(const char *dest, struct ref *refs)
 {
 	struct ref *ref;
 	int n = 0;

 	if (args.verbose) {
 		for (ref = refs; ref; ref = ref->next)
 			if (ref->status == REF_STATUS_UPTODATE)
 				n += print_one_push_status(ref, dest, n);
 	}

 	for (ref = refs; ref; ref = ref->next)
 		if (ref->status == REF_STATUS_OK)
 			n += print_one_push_status(ref, dest, n);

 	for (ref = refs; ref; ref = ref->next) {
 		if (ref->status != REF_STATUS_NONE &&
 		    ref->status != REF_STATUS_UPTODATE &&
 		    ref->status != REF_STATUS_OK)
 			n += print_one_push_status(ref, dest, n);
 	}
 }

 static int refs_pushed(struct ref *ref)
 {
 	for (; ref; ref = ref->next) {
 		switch(ref->status) {
 		case REF_STATUS_NONE:
 		case REF_STATUS_UPTODATE:
 			break;
 		default:
 			return 1;
 		}
 	}
 	return 0;
 }

 static int do_send_pack(int in, int out, struct remote *remote, const char *dest, int nr_refspec, const char **refspec)
 {
 	struct ref *ref;
 	int new_refs;
 	int ask_for_status_report = 0;
 	int allow_deleting_refs = 0;
 	int expect_status_report = 0;
 	int flags = MATCH_REFS_NONE;
 	int ret;

 	if (args.send_all)
 		flags |= MATCH_REFS_ALL;
 	if (args.send_mirror)
 		flags |= MATCH_REFS_MIRROR;

 	/* No funny business with the matcher */
 	remote_tail = get_remote_heads(in, &remote_refs, 0, NULL, REF_NORMAL);
 	get_local_heads();

 	/* Does the other end support the reporting? */
 	if (server_supports("report-status"))
 		ask_for_status_report = 1;
 	if (server_supports("delete-refs"))
 		allow_deleting_refs = 1;

 	/* match them up */
 	if (!remote_tail)
 		remote_tail = &remote_refs;
 	if (match_refs(local_refs, remote_refs, &remote_tail,
 		       nr_refspec, refspec, flags)) {
 		close(out);
 		return -1;
 	}

 	if (!remote_refs) {
 		fprintf(stderr, "No refs in common and none specified; doing nothing.\n"
 			"Perhaps you should specify a branch such as 'master'.\n");
 		close(out);
 		return 0;
 	}

 	/*
 	 * Finally, tell the other end!
 	 */
 	new_refs = 0;
 	for (ref = remote_refs; ref; ref = ref->next) {
 		const unsigned char *new_sha1;

 		if (!ref->peer_ref) {
 			if (!args.send_mirror)
 				continue;
 			new_sha1 = null_sha1;
 		}
 		else
 			new_sha1 = ref->peer_ref->new_sha1;


 		ref->deletion = is_null_sha1(new_sha1);
 		if (ref->deletion && !allow_deleting_refs) {
 			ref->status = REF_STATUS_REJECT_NODELETE;
 			continue;
 		}
 		if (!ref->deletion &&
 		    !hashcmp(ref->old_sha1, new_sha1)) {
 			ref->status = REF_STATUS_UPTODATE;
 			continue;
 		}

 		/* This part determines what can overwrite what.
 		 * The rules are:
 		 *
 		 * (0) you can always use --force or +A:B notation to
 		 *     selectively force individual ref pairs.
 		 *
 		 * (1) if the old thing does not exist, it is OK.
 		 *
 		 * (2) if you do not have the old thing, you are not allowed
 		 *     to overwrite it; you would not know what you are losing
 		 *     otherwise.
 		 *
 		 * (3) if both new and old are commit-ish, and new is a
 		 *     descendant of old, it is OK.
 		 *
 		 * (4) regardless of all of the above, removing :B is
 		 *     always allowed.
 		 */

 		ref->nonfastforward =
 		    !ref->deletion &&
 		    !is_null_sha1(ref->old_sha1) &&
 		    (!has_sha1_file(ref->old_sha1)
 		      || !ref_newer(new_sha1, ref->old_sha1));

 		if (ref->nonfastforward && !ref->force && !args.force_update) {
 			ref->status = REF_STATUS_REJECT_NONFASTFORWARD;
 			continue;
 		}

 		hashcpy(ref->new_sha1, new_sha1);
 		if (!ref->deletion)
 			new_refs++;

 		if (!args.dry_run) {
 			char *old_hex = sha1_to_hex(ref->old_sha1);
 			char *new_hex = sha1_to_hex(ref->new_sha1);

 			if (ask_for_status_report) {
 				packet_write(out, "%s %s %s%c%s",
 					old_hex, new_hex, ref->name, 0,
 					"report-status");
 				ask_for_status_report = 0;
 				expect_status_report = 1;
 			}
 			else
 				packet_write(out, "%s %s %s",
 					old_hex, new_hex, ref->name);
 		}
 		ref->status = expect_status_report ?
 			REF_STATUS_EXPECTING_REPORT :
 			REF_STATUS_OK;
 	}

 	packet_flush(out);
 	if (new_refs && !args.dry_run) {
 		if (pack_objects(out, remote_refs) < 0)
 			return -1;
 	}
 	else
 		close(out);

 	if (expect_status_report)
 		ret = receive_status(in, remote_refs);
 	else
 		ret = 0;

 	print_push_status(dest, remote_refs);

 	if (!args.dry_run && remote) {
 		for (ref = remote_refs; ref; ref = ref->next)
 			update_tracking_ref(remote, ref);
 	}

 	if (!refs_pushed(remote_refs))
 		fprintf(stderr, "Everything up-to-date\n");
 	if (ret < 0)
 		return ret;
 	for (ref = remote_refs; ref; ref = ref->next) {
 		switch (ref->status) {
 		case REF_STATUS_NONE:
 		case REF_STATUS_UPTODATE:
 		case REF_STATUS_OK:
 			break;
 		default:
 			return -1;
 		}
 	}
 	return 0;
 }

 static void verify_remote_names(int nr_heads, const char **heads)
 {
 	int i;

 	for (i = 0; i < nr_heads; i++) {
 		const char *remote = strrchr(heads[i], ':');

 		remote = remote ? (remote + 1) : heads[i];
 		switch (check_ref_format(remote)) {
 		case 0: /* ok */
 		case CHECK_REF_FORMAT_ONELEVEL:
 			/* ok but a single level -- that is fine for
 			 * a match pattern.
 			 */
 		case CHECK_REF_FORMAT_WILDCARD:
 			/* ok but ends with a pattern-match character */
 			continue;
 		}
 		die("remote part of refspec is not a valid name in %s",
 		    heads[i]);
 	}
 }

 int cmd_send_pack(int argc, const char **argv, const char *prefix)
 {
 	int i, nr_heads = 0;
 	const char **heads = NULL;
 	const char *remote_name = NULL;
 	struct remote *remote = NULL;
 	const char *dest = NULL;

 	argv++;
 	for (i = 1; i < argc; i++, argv++) {
 		const char *arg = *argv;

 		if (*arg == '-') {
 			if (!prefixcmp(arg, "--receive-pack=")) {
 				args.receivepack = arg + 15;
 				continue;
 			}
 			if (!prefixcmp(arg, "--exec=")) {
 				args.receivepack = arg + 7;
 				continue;
 			}
 			if (!prefixcmp(arg, "--remote=")) {
 				remote_name = arg + 9;
 				continue;
 			}
 			if (!strcmp(arg, "--all")) {
 				args.send_all = 1;
 				continue;
 			}
 			if (!strcmp(arg, "--dry-run")) {
 				args.dry_run = 1;
 				continue;
 			}
 			if (!strcmp(arg, "--mirror")) {
 				args.send_mirror = 1;
 				continue;
 			}
 			if (!strcmp(arg, "--force")) {
 				args.force_update = 1;
 				continue;
 			}
 			if (!strcmp(arg, "--verbose")) {
 				args.verbose = 1;
 				continue;
 			}
 			if (!strcmp(arg, "--thin")) {
 				args.use_thin_pack = 1;
 				continue;
 			}
 			usage(send_pack_usage);
 		}
 		if (!dest) {
 			dest = arg;
 			continue;
 		}
 		heads = (const char **) argv;
 		nr_heads = argc - i;
 		break;
 	}
 	if (!dest)
 		usage(send_pack_usage);
 	/*
 	 * --all and --mirror are incompatible; neither makes sense
 	 * with any refspecs.
 	 */
 	if ((heads && (args.send_all || args.send_mirror)) ||
 					(args.send_all && args.send_mirror))
 		usage(send_pack_usage);

 	if (remote_name) {
 		remote = remote_get(remote_name);
 		if (!remote_has_url(remote, dest)) {
 			die("Destination %s is not a uri for %s",
 			    dest, remote_name);
 		}
 	}

 	return send_pack(&args, dest, remote, nr_heads, heads);
 }

 int send_pack(struct send_pack_args *my_args,
 	      const char *dest, struct remote *remote,
 	      int nr_heads, const char **heads)
 {
 	int fd[2], ret;
 	struct child_process *conn;

 	memcpy(&args, my_args, sizeof(args));

 	verify_remote_names(nr_heads, heads);

 	conn = git_connect(fd, dest, args.receivepack, args.verbose ? CONNECT_VERBOSE : 0);
 	ret = do_send_pack(fd[0], fd[1], remote, dest, nr_heads, heads);
 	close(fd[0]);
 	/* do_send_pack always closes fd[1] */
 	ret |= finish_connect(conn);
 	return !!ret;
 }
	#include "cache.h"
	#include "commit.h"
	#include "tag.h"
	#include "refs.h"
	#include "pkt-line.h"
	#include "run-command.h"
	#include "remote.h"
	#include "send-pack.h"

	static const char send_pack_usage[] =
	"git-send-pack [--all \| --mirror] [--dry-run] [--force] [--receive-pack=<git-receive-pack>] [--verbose] [--thin] [<host>:]<directory> [<ref>...]\n"
	" --all and explicit <ref> specification are mutually exclusive.";

	static struct send_pack_args args = {
	/* .receivepack = */ "git-receive-pack",
	};

	/*
	* Make a pack stream and spit it out into file descriptor fd
	*/
	static int pack_objects(int fd, struct ref *refs)
	{
	/*
	* The child becomes pack-objects --revs; we feed
	* the revision parameters to it via its stdin and
	* let its stdout go back to the other end.
	*/
	const char *argv[] = {
	"pack-objects",
	"--all-progress",
	"--revs",
	"--stdout",
	NULL,
	NULL,
	};
	struct child_process po;

	if (args.use_thin_pack)
	argv[4] = "--thin";
	memset(&po, 0, sizeof(po));
	po.argv = argv;
	po.in = -1;
	po.out = fd;
	po.git_cmd = 1;
	if (start_command(&po))
	die("git-pack-objects failed (%s)", strerror(errno));

	/*
	* We feed the pack-objects we just spawned with revision
	* parameters by writing to the pipe.
	*/
	while (refs) {
	char buf[42];

	if (!is_null_sha1(refs->old_sha1) &&
	has_sha1_file(refs->old_sha1)) {
	memcpy(buf + 1, sha1_to_hex(refs->old_sha1), 40);
	buf[0] = '^';
	buf[41] = '\n';
	if (!write_or_whine(po.in, buf, 42,
	"send-pack: send refs"))
	break;
	}
	if (!is_null_sha1(refs->new_sha1)) {
	memcpy(buf, sha1_to_hex(refs->new_sha1), 40);
	buf[40] = '\n';
	if (!write_or_whine(po.in, buf, 41,
	"send-pack: send refs"))
	break;
	}
	refs = refs->next;
	}

	close(po.in);
	if (finish_command(&po))
	return error("pack-objects died with strange error");
	return 0;
	}

	static void unmark_and_free(struct commit_list *list, unsigned int mark)
	{
	while (list) {
	struct commit_list *temp = list;
	temp->item->object.flags &= ~mark;
	list = temp->next;
	free(temp);
	}
	}

	static int ref_newer(const unsigned char *new_sha1,
	const unsigned char *old_sha1)
	{
	struct object *o;
	struct commit old, new;
	struct commit_list list, used;
	int found = 0;

	/* Both new and old must be commit-ish and new is descendant of
	* old. Otherwise we require --force.
	*/
	o = deref_tag(parse_object(old_sha1), NULL, 0);
	if (!o \|\| o->type != OBJ_COMMIT)
	return 0;
	old = (struct commit *) o;

	o = deref_tag(parse_object(new_sha1), NULL, 0);
	if (!o \|\| o->type != OBJ_COMMIT)
	return 0;
	new = (struct commit *) o;

	if (parse_commit(new) < 0)
	return 0;

	used = list = NULL;
	commit_list_insert(new, &list);
	while (list) {
	new = pop_most_recent_commit(&list, 1);
	commit_list_insert(new, &used);
	if (new == old) {
	found = 1;
	break;
	}
	}
	unmark_and_free(list, 1);
	unmark_and_free(used, 1);
	return found;
	}

	static struct ref local_refs, *local_tail;
	static struct ref remote_refs, *remote_tail;

	static int one_local_ref(const char refname, const unsigned char sha1, int flag, void *cb_data)
	{
	struct ref *ref;
	int len = strlen(refname) + 1;
	ref = xcalloc(1, sizeof(*ref) + len);
	hashcpy(ref->new_sha1, sha1);
	memcpy(ref->name, refname, len);
	*local_tail = ref;
	local_tail = &ref->next;
	return 0;
	}

	static void get_local_heads(void)
	{
	local_tail = &local_refs;
	for_each_ref(one_local_ref, NULL);
	}

	static int receive_status(int in, struct ref *refs)
	{
	struct ref *hint;
	char line[1000];
	int ret = 0;
	int len = packet_read_line(in, line, sizeof(line));
	if (len < 10 \|\| memcmp(line, "unpack ", 7))
	return error("did not receive remote status");
	if (memcmp(line, "unpack ok\n", 10)) {
	char *p = line + strlen(line) - 1;
	if (*p == '\n')
	*p = '\0';
	error("unpack failed: %s", line + 7);
	ret = -1;
	}
	hint = NULL;
	while (1) {
	char *refname;
	char *msg;
	len = packet_read_line(in, line, sizeof(line));
	if (!len)
	break;
	if (len < 3 \|\|
	(memcmp(line, "ok ", 3) && memcmp(line, "ng ", 3))) {
	fprintf(stderr, "protocol error: %s\n", line);
	ret = -1;
	break;
	}

	line[strlen(line)-1] = '\0';
	refname = line + 3;
	msg = strchr(refname, ' ');
	if (msg)
	*msg++ = '\0';

	/* first try searching at our hint, falling back to all refs */
	if (hint)
	hint = find_ref_by_name(hint, refname);
	if (!hint)
	hint = find_ref_by_name(refs, refname);
	if (!hint) {
	warning("remote reported status on unknown ref: %s",
	refname);
	continue;
	}
	if (hint->status != REF_STATUS_EXPECTING_REPORT) {
	warning("remote reported status on unexpected ref: %s",
	refname);
	continue;
	}

	if (line[0] == 'o' && line[1] == 'k')
	hint->status = REF_STATUS_OK;
	else {
	hint->status = REF_STATUS_REMOTE_REJECT;
	ret = -1;
	}
	if (msg)
	hint->remote_status = xstrdup(msg);
	/* start our next search from the next ref */
	hint = hint->next;
	}
	return ret;
	}

	static void update_tracking_ref(struct remote remote, struct ref ref)
	{
	struct refspec rs;

	if (ref->status != REF_STATUS_OK)
	return;

	rs.src = ref->name;
	rs.dst = NULL;

	if (!remote_find_tracking(remote, &rs)) {
	if (args.verbose)
	fprintf(stderr, "updating local tracking ref '%s'\n", rs.dst);
	if (ref->deletion) {
	if (delete_ref(rs.dst, NULL))
	error("Failed to delete");
	} else
	update_ref("update by push", rs.dst,
	ref->new_sha1, NULL, 0, 0);
	free(rs.dst);
	}
	}

	static const char prettify_ref(const struct ref ref)
	{
	const char *name = ref->name;
	return name + (
	!prefixcmp(name, "refs/heads/") ? 11 :
	!prefixcmp(name, "refs/tags/") ? 10 :
	!prefixcmp(name, "refs/remotes/") ? 13 :
	0);
	}

	#define SUMMARY_WIDTH (2 * DEFAULT_ABBREV + 3)

	static void print_ref_status(char flag, const char summary, struct ref to, struct ref from, const char msg)
	{
	fprintf(stderr, " %c %-*s ", flag, SUMMARY_WIDTH, summary);
	if (from)
	fprintf(stderr, "%s -> %s", prettify_ref(from), prettify_ref(to));
	else
	fputs(prettify_ref(to), stderr);
	if (msg) {
	fputs(" (", stderr);
	fputs(msg, stderr);
	fputc(')', stderr);
	}
	fputc('\n', stderr);
	}

	static const char *status_abbrev(unsigned char sha1[20])
	{
	return find_unique_abbrev(sha1, DEFAULT_ABBREV);
	}

	static void print_ok_ref_status(struct ref *ref)
	{
	if (ref->deletion)
	print_ref_status('-', "[deleted]", ref, NULL, NULL);
	else if (is_null_sha1(ref->old_sha1))
	print_ref_status('*',
	(!prefixcmp(ref->name, "refs/tags/") ? "[new tag]" :
	"[new branch]"),
	ref, ref->peer_ref, NULL);
	else {
	char quickref[84];
	char type;
	const char *msg;

	strcpy(quickref, status_abbrev(ref->old_sha1));
	if (ref->nonfastforward) {
	strcat(quickref, "...");
	type = '+';
	msg = "forced update";
	} else {
	strcat(quickref, "..");
	type = ' ';
	msg = NULL;
	}
	strcat(quickref, status_abbrev(ref->new_sha1));

	print_ref_status(type, quickref, ref, ref->peer_ref, msg);
	}
	}

	static int print_one_push_status(struct ref ref, const char dest, int count)
	{
	if (!count)
	fprintf(stderr, "To %s\n", dest);

	switch(ref->status) {
	case REF_STATUS_NONE:
	print_ref_status('X', "[no match]", ref, NULL, NULL);
	break;
	case REF_STATUS_REJECT_NODELETE:
	print_ref_status('!', "[rejected]", ref, NULL,
	"remote does not support deleting refs");
	break;
	case REF_STATUS_UPTODATE:
	print_ref_status('=', "[up to date]", ref,
	ref->peer_ref, NULL);
	break;
	case REF_STATUS_REJECT_NONFASTFORWARD:
	print_ref_status('!', "[rejected]", ref, ref->peer_ref,
	"non-fast forward");
	break;
	case REF_STATUS_REMOTE_REJECT:
	print_ref_status('!', "[remote rejected]", ref,
	ref->deletion ? NULL : ref->peer_ref,
	ref->remote_status);
	break;
	case REF_STATUS_EXPECTING_REPORT:
	print_ref_status('!', "[remote failure]", ref,
	ref->deletion ? NULL : ref->peer_ref,
	"remote failed to report status");
	break;
	case REF_STATUS_OK:
	print_ok_ref_status(ref);
	break;
	}

	return 1;
	}

	static void print_push_status(const char dest, struct ref refs)
	{
	struct ref *ref;
	int n = 0;

	if (args.verbose) {
	for (ref = refs; ref; ref = ref->next)
	if (ref->status == REF_STATUS_UPTODATE)
	n += print_one_push_status(ref, dest, n);
	}

	for (ref = refs; ref; ref = ref->next)
	if (ref->status == REF_STATUS_OK)
	n += print_one_push_status(ref, dest, n);

	for (ref = refs; ref; ref = ref->next) {
	if (ref->status != REF_STATUS_NONE &&
	ref->status != REF_STATUS_UPTODATE &&
	ref->status != REF_STATUS_OK)
	n += print_one_push_status(ref, dest, n);
	}
	}

	static int refs_pushed(struct ref *ref)
	{
	for (; ref; ref = ref->next) {
	switch(ref->status) {
	case REF_STATUS_NONE:
	case REF_STATUS_UPTODATE:
	break;
	default:
	return 1;
	}
	}
	return 0;
	}

	static int do_send_pack(int in, int out, struct remote remote, const char dest, int nr_refspec, const char **refspec)
	{
	struct ref *ref;
	int new_refs;
	int ask_for_status_report = 0;
	int allow_deleting_refs = 0;
	int expect_status_report = 0;
	int flags = MATCH_REFS_NONE;
	int ret;

	if (args.send_all)
	flags \|= MATCH_REFS_ALL;
	if (args.send_mirror)
	flags \|= MATCH_REFS_MIRROR;

	/* No funny business with the matcher */
	remote_tail = get_remote_heads(in, &remote_refs, 0, NULL, REF_NORMAL);
	get_local_heads();

	/* Does the other end support the reporting? */
	if (server_supports("report-status"))
	ask_for_status_report = 1;
	if (server_supports("delete-refs"))
	allow_deleting_refs = 1;

	/* match them up */
	if (!remote_tail)
	remote_tail = &remote_refs;
	if (match_refs(local_refs, remote_refs, &remote_tail,
	nr_refspec, refspec, flags)) {
	close(out);
	return -1;
	}

	if (!remote_refs) {
	fprintf(stderr, "No refs in common and none specified; doing nothing.\n"
	"Perhaps you should specify a branch such as 'master'.\n");
	close(out);
	return 0;
	}

	/*
	* Finally, tell the other end!
	*/
	new_refs = 0;
	for (ref = remote_refs; ref; ref = ref->next) {
	const unsigned char *new_sha1;

	if (!ref->peer_ref) {
	if (!args.send_mirror)
	continue;
	new_sha1 = null_sha1;
	}
	else
	new_sha1 = ref->peer_ref->new_sha1;


	ref->deletion = is_null_sha1(new_sha1);
	if (ref->deletion && !allow_deleting_refs) {
	ref->status = REF_STATUS_REJECT_NODELETE;
	continue;
	}
	if (!ref->deletion &&
	!hashcmp(ref->old_sha1, new_sha1)) {
	ref->status = REF_STATUS_UPTODATE;
	continue;
	}

	/* This part determines what can overwrite what.
	* The rules are:
	*
	* (0) you can always use --force or +A:B notation to
	* selectively force individual ref pairs.
	*
	* (1) if the old thing does not exist, it is OK.
	*
	* (2) if you do not have the old thing, you are not allowed
	* to overwrite it; you would not know what you are losing
	* otherwise.
	*
	* (3) if both new and old are commit-ish, and new is a
	* descendant of old, it is OK.
	*
	* (4) regardless of all of the above, removing :B is
	* always allowed.
	*/

	ref->nonfastforward =
	!ref->deletion &&
	!is_null_sha1(ref->old_sha1) &&
	(!has_sha1_file(ref->old_sha1)
	\|\| !ref_newer(new_sha1, ref->old_sha1));

	if (ref->nonfastforward && !ref->force && !args.force_update) {
	ref->status = REF_STATUS_REJECT_NONFASTFORWARD;
	continue;
	}

	hashcpy(ref->new_sha1, new_sha1);
	if (!ref->deletion)
	new_refs++;

	if (!args.dry_run) {
	char *old_hex = sha1_to_hex(ref->old_sha1);
	char *new_hex = sha1_to_hex(ref->new_sha1);

	if (ask_for_status_report) {
	packet_write(out, "%s %s %s%c%s",
	old_hex, new_hex, ref->name, 0,
	"report-status");
	ask_for_status_report = 0;
	expect_status_report = 1;
	}
	else
	packet_write(out, "%s %s %s",
	old_hex, new_hex, ref->name);
	}
	ref->status = expect_status_report ?
	REF_STATUS_EXPECTING_REPORT :
	REF_STATUS_OK;
	}

	packet_flush(out);
	if (new_refs && !args.dry_run) {
	if (pack_objects(out, remote_refs) < 0)
	return -1;
	}
	else
	close(out);

	if (expect_status_report)
	ret = receive_status(in, remote_refs);
	else
	ret = 0;

	print_push_status(dest, remote_refs);

	if (!args.dry_run && remote) {
	for (ref = remote_refs; ref; ref = ref->next)
	update_tracking_ref(remote, ref);
	}

	if (!refs_pushed(remote_refs))
	fprintf(stderr, "Everything up-to-date\n");
	if (ret < 0)
	return ret;
	for (ref = remote_refs; ref; ref = ref->next) {
	switch (ref->status) {
	case REF_STATUS_NONE:
	case REF_STATUS_UPTODATE:
	case REF_STATUS_OK:
	break;
	default:
	return -1;
	}
	}
	return 0;
	}

	static void verify_remote_names(int nr_heads, const char **heads)
	{
	int i;

	for (i = 0; i < nr_heads; i++) {
	const char *remote = strrchr(heads[i], ':');

	remote = remote ? (remote + 1) : heads[i];
	switch (check_ref_format(remote)) {
	case 0: /* ok */
	case CHECK_REF_FORMAT_ONELEVEL:
	/* ok but a single level -- that is fine for
	* a match pattern.
	*/
	case CHECK_REF_FORMAT_WILDCARD:
	/* ok but ends with a pattern-match character */
	continue;
	}
	die("remote part of refspec is not a valid name in %s",
	heads[i]);
	}
	}

	int cmd_send_pack(int argc, const char *argv, const char prefix)
	{
	int i, nr_heads = 0;
	const char **heads = NULL;
	const char *remote_name = NULL;
	struct remote *remote = NULL;
	const char *dest = NULL;

	argv++;
	for (i = 1; i < argc; i++, argv++) {
	const char arg = argv;

	if (*arg == '-') {
	if (!prefixcmp(arg, "--receive-pack=")) {
	args.receivepack = arg + 15;
	continue;
	}
	if (!prefixcmp(arg, "--exec=")) {
	args.receivepack = arg + 7;
	continue;
	}
	if (!prefixcmp(arg, "--remote=")) {
	remote_name = arg + 9;
	continue;
	}
	if (!strcmp(arg, "--all")) {
	args.send_all = 1;
	continue;
	}
	if (!strcmp(arg, "--dry-run")) {
	args.dry_run = 1;
	continue;
	}
	if (!strcmp(arg, "--mirror")) {
	args.send_mirror = 1;
	continue;
	}
	if (!strcmp(arg, "--force")) {
	args.force_update = 1;
	continue;
	}
	if (!strcmp(arg, "--verbose")) {
	args.verbose = 1;
	continue;
	}
	if (!strcmp(arg, "--thin")) {
	args.use_thin_pack = 1;
	continue;
	}
	usage(send_pack_usage);
	}
	if (!dest) {
	dest = arg;
	continue;
	}
	heads = (const char **) argv;
	nr_heads = argc - i;
	break;
	}
	if (!dest)
	usage(send_pack_usage);
	/*
	* --all and --mirror are incompatible; neither makes sense
	* with any refspecs.
	*/
	if ((heads && (args.send_all \|\| args.send_mirror)) \|\|
	(args.send_all && args.send_mirror))
	usage(send_pack_usage);

	if (remote_name) {
	remote = remote_get(remote_name);
	if (!remote_has_url(remote, dest)) {
	die("Destination %s is not a uri for %s",
	dest, remote_name);
	}
	}

	return send_pack(&args, dest, remote, nr_heads, heads);
	}

	int send_pack(struct send_pack_args *my_args,
	const char dest, struct remote remote,
	int nr_heads, const char **heads)
	{
	int fd[2], ret;
	struct child_process *conn;

	memcpy(&args, my_args, sizeof(args));

	verify_remote_names(nr_heads, heads);

	conn = git_connect(fd, dest, args.receivepack, args.verbose ? CONNECT_VERBOSE : 0);
	ret = do_send_pack(fd[0], fd[1], remote, dest, nr_heads, heads);
	close(fd[0]);
	/* do_send_pack always closes fd[1] */
	ret \|= finish_connect(conn);
	return !!ret;
	}