Merge branch 'jk/send-pack'

* jk/send-pack: (24 commits)
  send-pack: cluster ref status reporting
  send-pack: fix "everything up-to-date" message
  send-pack: tighten remote error reporting
  make "find_ref_by_name" a public function
  Fix warning about bitfield in struct ref
  send-pack: assign remote errors to each ref
  send-pack: check ref->status before updating tracking refs
  send-pack: track errors for each ref
  git-push: add documentation for the newly added --mirror mode
  Add tests for git push'es mirror mode
  Update the tracking references only if they were succesfully updated on remote
  Add a test checking if send-pack updated local tracking branches correctly
  git-push: plumb in --mirror mode
  Teach send-pack a mirror mode
  send-pack: segfault fix on forced push
  Reteach builtin-ls-remote to understand remotes
  send-pack: require --verbose to show update of tracking refs
  receive-pack: don't mention successful updates
  more terse push output
  Build in ls-remote
  ...

26 files changed, 1285 insertions, 631 deletions

diff --git a/Documentation/git-push.txt b/Documentation/git-push.txt
index 4a68aab..b8003c6 100644
--- a/Documentation/git-push.txt
+++ b/Documentation/git-push.txt
@@ -63,6 +63,14 @@ the remote repository.
 	Instead of naming each ref to push, specifies that all
 	refs under `$GIT_DIR/refs/heads/` be pushed.
 
+\--mirror::
+	Instead of naming each ref to push, specifies that all
+	refs under `$GIT_DIR/refs/heads/` and `$GIT_DIR/refs/tags/`
+	be mirrored to the remote repository.  Newly created local
+	refs will be pushed to the remote end, locally updated refs
+	will be force updated on the remote end, and deleted refs
+	will be removed from the remote end.
+
 \--dry-run::
 	Do everything except actually send the updates.
 
diff --git a/Makefile b/Makefile
index 8809b0a..ccf522a 100644
--- a/Makefile
+++ b/Makefile
@@ -214,7 +214,6 @@ BASIC_LDFLAGS =
 SCRIPT_SH = \
 	git-bisect.sh git-checkout.sh \
 	git-clone.sh git-commit.sh \
-	git-ls-remote.sh \
 	git-merge-one-file.sh git-mergetool.sh git-parse-remote.sh \
 	git-pull.sh git-rebase.sh git-rebase--interactive.sh \
 	git-repack.sh git-request-pull.sh \
@@ -243,7 +242,7 @@ PROGRAMS = \
 	git-fast-import$X \
 	git-daemon$X \
 	git-merge-index$X git-mktag$X git-mktree$X git-patch-id$X \
-	git-peek-remote$X git-receive-pack$X \
+	git-receive-pack$X \
 	git-send-pack$X git-shell$X \
 	git-show-index$X \
 	git-unpack-file$X \
@@ -350,6 +349,7 @@ BUILTIN_OBJS = \
 	builtin-log.o \
 	builtin-ls-files.o \
 	builtin-ls-tree.o \
+	builtin-ls-remote.o \
 	builtin-mailinfo.o \
 	builtin-mailsplit.o \
 	builtin-merge-base.o \
@@ -363,6 +363,7 @@ BUILTIN_OBJS = \
 	builtin-push.o \
 	builtin-read-tree.o \
 	builtin-reflog.o \
+	builtin-send-pack.o \
 	builtin-config.o \
 	builtin-rerere.o \
 	builtin-reset.o \
diff --git a/builtin-fetch.c b/builtin-fetch.c
index be9e3ea..31e138e 100644
--- a/builtin-fetch.c
+++ b/builtin-fetch.c
@@ -31,7 +31,7 @@ static void unlock_pack_on_signal(int signo)
 }
 
 static void add_merge_config(struct ref **head,
-		           struct ref *remote_refs,
+			   const struct ref *remote_refs,
 		           struct branch *branch,
 		           struct ref ***tail)
 {
@@ -79,7 +79,7 @@ static struct ref *get_ref_map(struct transport *transport,
 	struct ref *ref_map = NULL;
 	struct ref **tail = &ref_map;
 
-	struct ref *remote_refs = transport_get_remote_refs(transport);
+	const struct ref *remote_refs = transport_get_remote_refs(transport);
 
 	if (ref_count || tags) {
 		for (i = 0; i < ref_count; i++) {
@@ -424,12 +424,12 @@ static struct ref *find_non_local_tags(struct transport *transport,
 	struct path_list new_refs = { NULL, 0, 0, 1 };
 	char *ref_name;
 	int ref_name_len;
-	unsigned char *ref_sha1;
-	struct ref *tag_ref;
+	const unsigned char *ref_sha1;
+	const struct ref *tag_ref;
 	struct ref *rm = NULL;
 	struct ref *ref_map = NULL;
 	struct ref **tail = &ref_map;
-	struct ref *ref;
+	const struct ref *ref;
 
 	for_each_ref(add_existing, &existing_refs);
 	for (ref = transport_get_remote_refs(transport); ref; ref = ref->next) {
diff --git a/builtin-ls-remote.c b/builtin-ls-remote.c
new file mode 100644
index 0000000..56f3f88
--- /dev/null
+++ b/builtin-ls-remote.c
@@ -0,0 +1,74 @@
+#include "builtin.h"
+#include "cache.h"
+#include "transport.h"
+#include "remote.h"
+
+static const char ls_remote_usage[] =
+"git-ls-remote [--upload-pack=<git-upload-pack>] [<host>:]<directory>";
+
+int cmd_ls_remote(int argc, const char **argv, const char *prefix)
+{
+	int i;
+	const char *dest = NULL;
+	int nongit = 0;
+	unsigned flags = 0;
+	const char *uploadpack = NULL;
+
+	struct remote *remote;
+	struct transport *transport;
+	const struct ref *ref;
+
+	setup_git_directory_gently(&nongit);
+
+	for (i = 1; i < argc; i++) {
+		const char *arg = argv[i];
+
+		if (*arg == '-') {
+			if (!prefixcmp(arg, "--upload-pack=")) {
+				uploadpack = arg + 14;
+				continue;
+			}
+			if (!prefixcmp(arg, "--exec=")) {
+				uploadpack = arg + 7;
+				continue;
+			}
+			if (!strcmp("--tags", arg)) {
+				flags |= REF_TAGS;
+				continue;
+			}
+			if (!strcmp("--heads", arg)) {
+				flags |= REF_HEADS;
+				continue;
+			}
+			if (!strcmp("--refs", arg)) {
+				flags |= REF_NORMAL;
+				continue;
+			}
+			usage(ls_remote_usage);
+		}
+		dest = arg;
+		break;
+	}
+
+	if (!dest || i != argc - 1)
+		usage(ls_remote_usage);
+
+	remote = nongit ? NULL : remote_get(dest);
+	if (remote && !remote->url_nr)
+		die("remote %s has no configured URL", dest);
+	transport = transport_get(remote, remote ? remote->url[0] : dest);
+	if (uploadpack != NULL)
+		transport_set_option(transport, TRANS_OPT_UPLOADPACK, uploadpack);
+
+	ref = transport_get_remote_refs(transport);
+
+	if (!ref)
+		return 1;
+
+	while (ref) {
+		if (check_ref_type(ref, flags))
+			printf("%s	%s\n", sha1_to_hex(ref->old_sha1), ref->name);
+		ref = ref->next;
+	}
+	return 0;
+}
diff --git a/builtin-push.c b/builtin-push.c
index 6d1da07..41df717 100644
--- a/builtin-push.c
+++ b/builtin-push.c
@@ -10,7 +10,7 @@
 #include "parse-options.h"
 
 static const char * const push_usage[] = {
-	"git-push [--all] [--dry-run] [--tags] [--receive-pack=<git-receive-pack>] [--repo=all] [-f | --force] [-v] [<repository> <refspec>...]",
+	"git-push [--all | --mirror] [--dry-run] [--tags] [--receive-pack=<git-receive-pack>] [--repo=all] [-f | --force] [-v] [<repository> <refspec>...]",
 	NULL,
 };
 
@@ -91,6 +91,7 @@ int cmd_push(int argc, const char **argv, const char *prefix)
 {
 	int flags = 0;
 	int all = 0;
+	int mirror = 0;
 	int dry_run = 0;
 	int force = 0;
 	int tags = 0;
@@ -100,6 +101,7 @@ int cmd_push(int argc, const char **argv, const char *prefix)
 		OPT__VERBOSE(&verbose),
 		OPT_STRING( 0 , "repo", &repo, "repository", "repository"),
 		OPT_BOOLEAN( 0 , "all", &all, "push all refs"),
+		OPT_BOOLEAN( 0 , "mirror", &mirror, "mirror all refs"),
 		OPT_BOOLEAN( 0 , "tags", &tags, "push tags"),
 		OPT_BOOLEAN( 0 , "dry-run", &dry_run, "dry run"),
 		OPT_BOOLEAN('f', "force", &force, "force updates"),
@@ -121,13 +123,21 @@ int cmd_push(int argc, const char **argv, const char *prefix)
 		add_refspec("refs/tags/*");
 	if (all)
 		flags |= TRANSPORT_PUSH_ALL;
+	if (mirror)
+		flags |= (TRANSPORT_PUSH_MIRROR|TRANSPORT_PUSH_FORCE);
 
 	if (argc > 0) {
 		repo = argv[0];
 		set_refspecs(argv + 1, argc - 1);
 	}
-	if ((flags & TRANSPORT_PUSH_ALL) && refspec)
+	if ((flags & (TRANSPORT_PUSH_ALL|TRANSPORT_PUSH_MIRROR)) && refspec)
 		usage_with_options(push_usage, options);
 
+	if ((flags & (TRANSPORT_PUSH_ALL|TRANSPORT_PUSH_MIRROR)) ==
+				(TRANSPORT_PUSH_ALL|TRANSPORT_PUSH_MIRROR)) {
+		error("--all and --mirror are incompatible");
+		usage_with_options(push_usage, options);
+	}
+
 	return do_push(repo, flags);
 }
diff --git a/builtin-send-pack.c b/builtin-send-pack.c
new file mode 100644
index 0000000..25ae1fe
--- /dev/null
+++ b/builtin-send-pack.c
@@ -0,0 +1,652 @@
+#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;
+	}
+
+	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])
+{
+	const char *abbrev;
+	abbrev = find_unique_abbrev(sha1, DEFAULT_ABBREV);
+	return abbrev ? abbrev : sha1_to_hex(sha1);
+}
+
+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))
+		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");
+		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) {
+			close(out);
+			return -1;
+		}
+	}
+	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 = strchr(heads[i], ':');
+
+		remote = remote ? (remote + 1) : heads[i];
+		switch (check_ref_format(remote)) {
+		case 0: /* ok */
+		case -2: /* ok but a single level -- that is fine for
+			  * a match pattern.
+			  */
+		case -3: /* 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]);
+	close(fd[1]);
+	ret |= finish_connect(conn);
+	return !!ret;
+}
diff --git a/builtin.h b/builtin.h
index 6ecf12b..98ada7b 100644
--- a/builtin.h
+++ b/builtin.h
@@ -49,6 +49,7 @@ extern int cmd_log(int argc, const char **argv, const char *prefix);
 extern int cmd_log_reflog(int argc, const char **argv, const char *prefix);
 extern int cmd_ls_files(int argc, const char **argv, const char *prefix);
 extern int cmd_ls_tree(int argc, const char **argv, const char *prefix);
+extern int cmd_ls_remote(int argc, const char **argv, const char *prefix);
 extern int cmd_mailinfo(int argc, const char **argv, const char *prefix);
 extern int cmd_mailsplit(int argc, const char **argv, const char *prefix);
 extern int cmd_merge_base(int argc, const char **argv, const char *prefix);
@@ -71,6 +72,7 @@ extern int cmd_rev_parse(int argc, const char **argv, const char *prefix);
 extern int cmd_revert(int argc, const char **argv, const char *prefix);
 extern int cmd_rm(int argc, const char **argv, const char *prefix);
 extern int cmd_runstatus(int argc, const char **argv, const char *prefix);
+extern int cmd_send_pack(int argc, const char **argv, const char *prefix);
 extern int cmd_shortlog(int argc, const char **argv, const char *prefix);
 extern int cmd_show(int argc, const char **argv, const char *prefix);
 extern int cmd_show_branch(int argc, const char **argv, const char *prefix);
diff --git a/cache.h b/cache.h
index a0b9377..aaa135b 100644
--- a/cache.h
+++ b/cache.h
@@ -500,8 +500,20 @@ struct ref {
 	struct ref *next;
 	unsigned char old_sha1[20];
 	unsigned char new_sha1[20];
-	unsigned char force;
-	unsigned char merge;
+	unsigned int force:1,
+		merge:1,
+		nonfastforward:1,
+		deletion:1;
+	enum {
+		REF_STATUS_NONE = 0,
+		REF_STATUS_OK,
+		REF_STATUS_REJECT_NONFASTFORWARD,
+		REF_STATUS_REJECT_NODELETE,
+		REF_STATUS_UPTODATE,
+		REF_STATUS_REMOTE_REJECT,
+		REF_STATUS_EXPECTING_REPORT,
+	} status;
+	char *remote_status;
 	struct ref *peer_ref; /* when renaming */
 	char name[FLEX_ARRAY]; /* more */
 };
@@ -510,8 +522,10 @@ struct ref {
 #define REF_HEADS	(1u << 1)
 #define REF_TAGS	(1u << 2)
 
+extern struct ref *find_ref_by_name(struct ref *list, const char *name);
+
 #define CONNECT_VERBOSE       (1u << 0)
-extern struct child_process *git_connect(int fd[2], char *url, const char *prog, int flags);
+extern struct child_process *git_connect(int fd[2], const char *url, const char *prog, int flags);
 extern int finish_connect(struct child_process *conn);
 extern int path_match(const char *path, int nr, char **match);
 extern int get_ack(int fd, unsigned char *result_sha1);
diff --git a/connect.c b/connect.c
index 44e423d..3aefd4a 100644
--- a/connect.c
+++ b/connect.c
@@ -36,6 +36,11 @@ static int check_ref(const char *name, int len, unsigned int flags)
 	return !(flags & ~REF_NORMAL);
 }
 
+int check_ref_type(const struct ref *ref, int flags)
+{
+	return check_ref(ref->name, strlen(ref->name), flags);
+}
+
 /*
  * Read all the refs from the other end
  */
@@ -476,9 +481,10 @@ char *get_port(char *host)
  *
  * If it returns, the connect is successful; it just dies on errors.
  */
-struct child_process *git_connect(int fd[2], char *url,
+struct child_process *git_connect(int fd[2], const char *url_orig,
 				  const char *prog, int flags)
 {
+	char *url = xstrdup(url_orig);
 	char *host, *path = url;
 	char *end;
 	int c;
@@ -568,6 +574,7 @@ struct child_process *git_connect(int fd[2], char *url,
 			     prog, path, 0,
 			     target_host, 0);
 		free(target_host);
+		free(url);
 		if (free_path)
 			free(path);
 		return NULL;
@@ -619,6 +626,7 @@ struct child_process *git_connect(int fd[2], char *url,
 	fd[0] = conn->out; /* read from child's stdout */
 	fd[1] = conn->in;  /* write to child's stdin */
 	strbuf_release(&cmd);
+	free(url);
 	if (free_path)
 		free(path);
 	return conn;
diff --git a/git-ls-remote.sh b/contrib/examples/git-ls-remote.sh
index fec70bb..fec70bb 100755
--- a/git-ls-remote.sh
+++ b/contrib/examples/git-ls-remote.sh
diff --git a/git.c b/git.c
index 517ef41..01bbbc7 100644
--- a/git.c
+++ b/git.c
@@ -322,6 +322,7 @@ static void handle_internal_command(int argc, const char **argv)
 		{ "log", cmd_log, RUN_SETUP | USE_PAGER },
 		{ "ls-files", cmd_ls_files, RUN_SETUP },
 		{ "ls-tree", cmd_ls_tree, RUN_SETUP },
+		{ "ls-remote", cmd_ls_remote },
 		{ "mailinfo", cmd_mailinfo },
 		{ "mailsplit", cmd_mailsplit },
 		{ "merge-base", cmd_merge_base, RUN_SETUP },
@@ -330,6 +331,7 @@ static void handle_internal_command(int argc, const char **argv)
 		{ "mv", cmd_mv, RUN_SETUP | NEED_WORK_TREE },
 		{ "name-rev", cmd_name_rev, RUN_SETUP },
 		{ "pack-objects", cmd_pack_objects, RUN_SETUP },
+		{ "peek-remote", cmd_ls_remote },
 		{ "pickaxe", cmd_blame, RUN_SETUP },
 		{ "prune", cmd_prune, RUN_SETUP },
 		{ "prune-packed", cmd_prune_packed, RUN_SETUP },
@@ -344,6 +346,7 @@ static void handle_internal_command(int argc, const char **argv)
 		{ "revert", cmd_revert, RUN_SETUP | NEED_WORK_TREE },
 		{ "rm", cmd_rm, RUN_SETUP },
 		{ "runstatus", cmd_runstatus, RUN_SETUP | NEED_WORK_TREE },
+		{ "send-pack", cmd_send_pack, RUN_SETUP },
 		{ "shortlog", cmd_shortlog, RUN_SETUP | USE_PAGER },
 		{ "show-branch", cmd_show_branch, RUN_SETUP },
 		{ "show", cmd_show, RUN_SETUP | USE_PAGER },
diff --git a/http-push.c b/http-push.c
index 9314621..66b81f1 100644
--- a/http-push.c
+++ b/http-push.c
@@ -78,7 +78,7 @@ static struct curl_slist *no_pragma_header;
 static struct curl_slist *default_headers;
 
 static int push_verbosely;
-static int push_all;
+static int push_all = MATCH_REFS_NONE;
 static int force_all;
 static int dry_run;
 
@@ -2300,7 +2300,7 @@ int main(int argc, char **argv)
 
 		if (*arg == '-') {
 			if (!strcmp(arg, "--all")) {
-				push_all = 1;
+				push_all = MATCH_REFS_ALL;
 				continue;
 			}
 			if (!strcmp(arg, "--force")) {
@@ -2393,7 +2393,7 @@ int main(int argc, char **argv)
 	if (!remote_tail)
 		remote_tail = &remote_refs;
 	if (match_refs(local_refs, remote_refs, &remote_tail,
-		       nr_refspec, refspec, push_all))
+		       nr_refspec, (const char **) refspec, push_all))
 		return -1;
 	if (!remote_refs) {
 		fprintf(stderr, "No refs in common and none specified; doing nothing.\n");
diff --git a/peek-remote.c b/peek-remote.c
deleted file mode 100644
index 8d20f7c..0000000
--- a/peek-remote.c
+++ /dev/null
@@ -1,73 +0,0 @@
-#include "cache.h"
-#include "refs.h"
-#include "pkt-line.h"
-
-static const char peek_remote_usage[] =
-"git-peek-remote [--upload-pack=<git-upload-pack>] [<host>:]<directory>";
-static const char *uploadpack = "git-upload-pack";
-
-static int peek_remote(int fd[2], unsigned flags)
-{
-	struct ref *ref;
-
-	get_remote_heads(fd[0], &ref, 0, NULL, flags);
-	packet_flush(fd[1]);
-
-	while (ref) {
-		printf("%s	%s\n", sha1_to_hex(ref->old_sha1), ref->name);
-		ref = ref->next;
-	}
-	return 0;
-}
-
-int main(int argc, char **argv)
-{
-	int i, ret;
-	char *dest = NULL;
-	int fd[2];
-	struct child_process *conn;
-	int nongit = 0;
-	unsigned flags = 0;
-
-	setup_git_directory_gently(&nongit);
-
-	for (i = 1; i < argc; i++) {
-		char *arg = argv[i];
-
-		if (*arg == '-') {
-			if (!prefixcmp(arg, "--upload-pack=")) {
-				uploadpack = arg + 14;
-				continue;
-			}
-			if (!prefixcmp(arg, "--exec=")) {
-				uploadpack = arg + 7;
-				continue;
-			}
-			if (!strcmp("--tags", arg)) {
-				flags |= REF_TAGS;
-				continue;
-			}
-			if (!strcmp("--heads", arg)) {
-				flags |= REF_HEADS;
-				continue;
-			}
-			if (!strcmp("--refs", arg)) {
-				flags |= REF_NORMAL;
-				continue;
-			}
-			usage(peek_remote_usage);
-		}
-		dest = arg;
-		break;
-	}
-
-	if (!dest || i != argc - 1)
-		usage(peek_remote_usage);
-
-	conn = git_connect(fd, dest, uploadpack, 0);
-	ret = peek_remote(fd, flags);
-	close(fd[0]);
-	close(fd[1]);
-	ret |= finish_connect(conn);
-	return !!ret;
-}
diff --git a/receive-pack.c b/receive-pack.c
index 38e35c0..ed44b89 100644
--- a/receive-pack.c
+++ b/receive-pack.c
@@ -204,8 +204,6 @@ static const char *update(struct command *cmd)
 			error("failed to delete %s", name);
 			return "failed to delete";
 		}
-		fprintf(stderr, "%s: %s -> deleted\n", name,
-			sha1_to_hex(old_sha1));
 		return NULL; /* good */
 	}
 	else {
@@ -217,8 +215,6 @@ static const char *update(struct command *cmd)
 		if (write_ref_sha1(lock, new_sha1, "push")) {
 			return "failed to write"; /* error() already called */
 		}
-		fprintf(stderr, "%s: %s -> %s\n", name,
-			sha1_to_hex(old_sha1), sha1_to_hex(new_sha1));
 		return NULL; /* good */
 	}
 }
diff --git a/refs.c b/refs.c
index ae53254..54ec98d 100644
--- a/refs.c
+++ b/refs.c
@@ -1433,3 +1433,11 @@ int update_ref(const char *action, const char *refname,
 	}
 	return 0;
 }
+
+struct ref *find_ref_by_name(struct ref *list, const char *name)
+{
+	for ( ; list; list = list->next)
+		if (!strcmp(list->name, name))
+			return list;
+	return NULL;
+}
diff --git a/remote.c b/remote.c
index bec2ba1..bb01059 100644
--- a/remote.c
+++ b/remote.c
@@ -485,7 +485,7 @@ struct ref *alloc_ref(unsigned namelen)
 	return ret;
 }
 
-static struct ref *copy_ref(struct ref *ref)
+static struct ref *copy_ref(const struct ref *ref)
 {
 	struct ref *ret = xmalloc(sizeof(struct ref) + strlen(ref->name) + 1);
 	memcpy(ret, ref, sizeof(struct ref) + strlen(ref->name) + 1);
@@ -493,6 +493,18 @@ static struct ref *copy_ref(struct ref *ref)
 	return ret;
 }
 
+struct ref *copy_ref_list(const struct ref *ref)
+{
+	struct ref *ret = NULL;
+	struct ref **tail = &ret;
+	while (ref) {
+		*tail = copy_ref(ref);
+		ref = ref->next;
+		tail = &((*tail)->next);
+	}
+	return ret;
+}
+
 void free_refs(struct ref *ref)
 {
 	struct ref *next;
@@ -684,14 +696,6 @@ static int match_explicit_refs(struct ref *src, struct ref *dst,
 	return -errs;
 }
 
-static struct ref *find_ref_by_name(struct ref *list, const char *name)
-{
-	for ( ; list; list = list->next)
-		if (!strcmp(list->name, name))
-			return list;
-	return NULL;
-}
-
 static const struct refspec *check_pattern_match(const struct refspec *rs,
 						 int rs_nr,
 						 const struct ref *src)
@@ -710,10 +714,12 @@ static const struct refspec *check_pattern_match(const struct refspec *rs,
  * without thinking.
  */
 int match_refs(struct ref *src, struct ref *dst, struct ref ***dst_tail,
-	       int nr_refspec, char **refspec, int all)
+	       int nr_refspec, const char **refspec, int flags)
 {
 	struct refspec *rs =
 		parse_ref_spec(nr_refspec, (const char **) refspec);
+	int send_all = flags & MATCH_REFS_ALL;
+	int send_mirror = flags & MATCH_REFS_MIRROR;
 
 	if (match_explicit_refs(src, dst, dst_tail, rs, nr_refspec))
 		return -1;
@@ -730,7 +736,7 @@ int match_refs(struct ref *src, struct ref *dst, struct ref ***dst_tail,
 			if (!pat)
 				continue;
 		}
-		else if (prefixcmp(src->name, "refs/heads/"))
+		else if (!send_mirror && prefixcmp(src->name, "refs/heads/"))
 			/*
 			 * "matching refs"; traditionally we pushed everything
 			 * including refs outside refs/heads/ hierarchy, but
@@ -751,10 +757,13 @@ int match_refs(struct ref *src, struct ref *dst, struct ref ***dst_tail,
 		if (dst_peer && dst_peer->peer_ref)
 			/* We're already sending something to this ref. */
 			goto free_name;
-		if (!dst_peer && !nr_refspec && !all)
-			/* Remote doesn't have it, and we have no
+
+		if (!dst_peer && !nr_refspec && !(send_all || send_mirror))
+			/*
+			 * Remote doesn't have it, and we have no
 			 * explicit pattern, and we don't have
-			 * --all. */
+			 * --all nor --mirror.
+			 */
 			goto free_name;
 		if (!dst_peer) {
 			/* Create a new one and link it */
@@ -810,10 +819,10 @@ int branch_merge_matches(struct branch *branch,
 	return ref_matches_abbrev(branch->merge[i]->src, refname);
 }
 
-static struct ref *get_expanded_map(struct ref *remote_refs,
+static struct ref *get_expanded_map(const struct ref *remote_refs,
 				    const struct refspec *refspec)
 {
-	struct ref *ref;
+	const struct ref *ref;
 	struct ref *ret = NULL;
 	struct ref **tail = &ret;
 
@@ -824,7 +833,7 @@ static struct ref *get_expanded_map(struct ref *remote_refs,
 		if (strchr(ref->name, '^'))
 			continue; /* a dereference item */
 		if (!prefixcmp(ref->name, refspec->src)) {
-			char *match;
+			const char *match;
 			struct ref *cpy = copy_ref(ref);
 			match = ref->name + remote_prefix_len;
 
@@ -842,9 +851,9 @@ static struct ref *get_expanded_map(struct ref *remote_refs,
 	return ret;
 }
 
-static struct ref *find_ref_by_name_abbrev(struct ref *refs, const char *name)
+static const struct ref *find_ref_by_name_abbrev(const struct ref *refs, const char *name)
 {
-	struct ref *ref;
+	const struct ref *ref;
 	for (ref = refs; ref; ref = ref->next) {
 		if (ref_matches_abbrev(name, ref->name))
 			return ref;
@@ -852,9 +861,9 @@ static struct ref *find_ref_by_name_abbrev(struct ref *refs, const char *name)
 	return NULL;
 }
 
-struct ref *get_remote_ref(struct ref *remote_refs, const char *name)
+struct ref *get_remote_ref(const struct ref *remote_refs, const char *name)
 {
-	struct ref *ref = find_ref_by_name_abbrev(remote_refs, name);
+	const struct ref *ref = find_ref_by_name_abbrev(remote_refs, name);
 
 	if (!ref)
 		return NULL;
@@ -887,7 +896,7 @@ static struct ref *get_local_ref(const char *name)
 	return ret;
 }
 
-int get_fetch_map(struct ref *remote_refs,
+int get_fetch_map(const struct ref *remote_refs,
 		  const struct refspec *refspec,
 		  struct ref ***tail,
 		  int missing_ok)
diff --git a/remote.h b/remote.h
index 878b4ec..b10036c 100644
--- a/remote.h
+++ b/remote.h
@@ -44,6 +44,10 @@ struct refspec {
 
 struct ref *alloc_ref(unsigned namelen);
 
+struct ref *copy_ref_list(const struct ref *ref);
+
+int check_ref_type(const struct ref *ref, int flags);
+
 /*
  * Frees the entire list and peers of elements.
  */
@@ -57,7 +61,7 @@ void ref_remove_duplicates(struct ref *ref_map);
 struct refspec *parse_ref_spec(int nr_refspec, const char **refspec);
 
 int match_refs(struct ref *src, struct ref *dst, struct ref ***dst_tail,
-	       int nr_refspec, char **refspec, int all);
+	       int nr_refspec, const char **refspec, int all);
 
 /*
  * Given a list of the remote refs and the specification of things to
@@ -71,10 +75,10 @@ int match_refs(struct ref *src, struct ref *dst, struct ref ***dst_tail,
  * missing_ok is usually false, but when we are adding branch.$name.merge
  * it is Ok if the branch is not at the remote anymore.
  */
-int get_fetch_map(struct ref *remote_refs, const struct refspec *refspec,
+int get_fetch_map(const struct ref *remote_refs, const struct refspec *refspec,
 		  struct ref ***tail, int missing_ok);
 
-struct ref *get_remote_ref(struct ref *remote_refs, const char *name);
+struct ref *get_remote_ref(const struct ref *remote_refs, const char *name);
 
 /*
  * For the given remote, reads the refspec's src and sets the other fields.
@@ -98,4 +102,11 @@ struct branch *branch_get(const char *name);
 int branch_has_merge_config(struct branch *branch);
 int branch_merge_matches(struct branch *, int n, const char *);
 
+/* Flags to match_refs. */
+enum match_refs_flags {
+	MATCH_REFS_NONE		= 0,
+	MATCH_REFS_ALL 		= (1 << 0),
+	MATCH_REFS_MIRROR	= (1 << 1),
+};
+
 #endif
diff --git a/send-pack.c b/send-pack.c
deleted file mode 100644
index b74fd45..0000000
--- a/send-pack.c
+++ /dev/null
@@ -1,461 +0,0 @@
-#include "cache.h"
-#include "commit.h"
-#include "tag.h"
-#include "refs.h"
-#include "pkt-line.h"
-#include "run-command.h"
-#include "remote.h"
-
-static const char send_pack_usage[] =
-"git-send-pack [--all] [--dry-run] [--force] [--receive-pack=<git-receive-pack>] [--verbose] [--thin] [<host>:]<directory> [<ref>...]\n"
-"  --all and explicit <ref> specification are mutually exclusive.";
-static const char *receivepack = "git-receive-pack";
-static int verbose;
-static int send_all;
-static int force_update;
-static int use_thin_pack;
-static int dry_run;
-
-/*
- * 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 *args[] = {
-		"pack-objects",
-		"--all-progress",
-		"--revs",
-		"--stdout",
-		NULL,
-		NULL,
-	};
-	struct child_process po;
-
-	if (use_thin_pack)
-		args[4] = "--thin";
-	memset(&po, 0, sizeof(po));
-	po.argv = args;
-	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;
-	}
-
-	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)
-{
-	char line[1000];
-	int ret = 0;
-	int len = packet_read_line(in, line, sizeof(line));
-	if (len < 10 || memcmp(line, "unpack ", 7)) {
-		fprintf(stderr, "did not receive status back\n");
-		return -1;
-	}
-	if (memcmp(line, "unpack ok\n", 10)) {
-		fputs(line, stderr);
-		ret = -1;
-	}
-	while (1) {
-		len = packet_read_line(in, line, sizeof(line));
-		if (!len)
-			break;
-		if (len < 3 ||
-		    (memcmp(line, "ok", 2) && memcmp(line, "ng", 2))) {
-			fprintf(stderr, "protocol error: %s\n", line);
-			ret = -1;
-			break;
-		}
-		if (!memcmp(line, "ok", 2))
-			continue;
-		fputs(line, stderr);
-		ret = -1;
-	}
-	return ret;
-}
-
-static void update_tracking_ref(struct remote *remote, struct ref *ref)
-{
-	struct refspec rs;
-	int will_delete_ref;
-
-	rs.src = ref->name;
-	rs.dst = NULL;
-
-	if (!ref->peer_ref)
-		return;
-
-	will_delete_ref = is_null_sha1(ref->peer_ref->new_sha1);
-
-	if (!will_delete_ref &&
-			!hashcmp(ref->old_sha1, ref->peer_ref->new_sha1))
-		return;
-
-	if (!remote_find_tracking(remote, &rs)) {
-		fprintf(stderr, "updating local tracking ref '%s'\n", rs.dst);
-		if (is_null_sha1(ref->peer_ref->new_sha1)) {
-			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 int send_pack(int in, int out, struct remote *remote, int nr_refspec, char **refspec)
-{
-	struct ref *ref;
-	int new_refs;
-	int ret = 0;
-	int ask_for_status_report = 0;
-	int allow_deleting_refs = 0;
-	int expect_status_report = 0;
-
-	/* 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, send_all))
-		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");
-		return 0;
-	}
-
-	/*
-	 * Finally, tell the other end!
-	 */
-	new_refs = 0;
-	for (ref = remote_refs; ref; ref = ref->next) {
-		char old_hex[60], *new_hex;
-		int will_delete_ref;
-
-		if (!ref->peer_ref)
-			continue;
-
-
-		will_delete_ref = is_null_sha1(ref->peer_ref->new_sha1);
-		if (will_delete_ref && !allow_deleting_refs) {
-			error("remote does not support deleting refs");
-			ret = -2;
-			continue;
-		}
-		if (!will_delete_ref &&
-		    !hashcmp(ref->old_sha1, ref->peer_ref->new_sha1)) {
-			if (verbose)
-				fprintf(stderr, "'%s': up-to-date\n", ref->name);
-			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.
-		 */
-
-		if (!force_update &&
-		    !will_delete_ref &&
-		    !is_null_sha1(ref->old_sha1) &&
-		    !ref->force) {
-			if (!has_sha1_file(ref->old_sha1) ||
-			    !ref_newer(ref->peer_ref->new_sha1,
-				       ref->old_sha1)) {
-				/* We do not have the remote ref, or
-				 * we know that the remote ref is not
-				 * an ancestor of what we are trying to
-				 * push.  Either way this can be losing
-				 * commits at the remote end and likely
-				 * we were not up to date to begin with.
-				 */
-				error("remote '%s' is not an ancestor of\n"
-				      " local  '%s'.\n"
-				      " Maybe you are not up-to-date and "
-				      "need to pull first?",
-				      ref->name,
-				      ref->peer_ref->name);
-				ret = -2;
-				continue;
-			}
-		}
-		hashcpy(ref->new_sha1, ref->peer_ref->new_sha1);
-		if (!will_delete_ref)
-			new_refs++;
-		strcpy(old_hex, sha1_to_hex(ref->old_sha1));
-		new_hex = sha1_to_hex(ref->new_sha1);
-
-		if (!dry_run) {
-			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);
-		}
-		if (will_delete_ref)
-			fprintf(stderr, "deleting '%s'\n", ref->name);
-		else {
-			fprintf(stderr, "updating '%s'", ref->name);
-			if (strcmp(ref->name, ref->peer_ref->name))
-				fprintf(stderr, " using '%s'",
-					ref->peer_ref->name);
-			fprintf(stderr, "\n  from %s\n  to   %s\n",
-				old_hex, new_hex);
-		}
-	}
-
-	packet_flush(out);
-	if (new_refs && !dry_run)
-		ret = pack_objects(out, remote_refs);
-	close(out);
-
-	if (expect_status_report) {
-		if (receive_status(in))
-			ret = -4;
-	}
-
-	if (!dry_run && remote && ret == 0) {
-		for (ref = remote_refs; ref; ref = ref->next)
-			update_tracking_ref(remote, ref);
-	}
-
-	if (!new_refs && ret == 0)
-		fprintf(stderr, "Everything up-to-date\n");
-	return ret;
-}
-
-static void verify_remote_names(int nr_heads, char **heads)
-{
-	int i;
-
-	for (i = 0; i < nr_heads; i++) {
-		const char *remote = strchr(heads[i], ':');
-
-		remote = remote ? (remote + 1) : heads[i];
-		switch (check_ref_format(remote)) {
-		case 0: /* ok */
-		case -2: /* ok but a single level -- that is fine for
-			  * a match pattern.
-			  */
-		case -3: /* ok but ends with a pattern-match character */
-			continue;
-		}
-		die("remote part of refspec is not a valid name in %s",
-		    heads[i]);
-	}
-}
-
-int main(int argc, char **argv)
-{
-	int i, nr_heads = 0;
-	char *dest = NULL;
-	char **heads = NULL;
-	int fd[2], ret;
-	struct child_process *conn;
-	char *remote_name = NULL;
-	struct remote *remote = NULL;
-
-	setup_git_directory();
-	git_config(git_default_config);
-
-	argv++;
-	for (i = 1; i < argc; i++, argv++) {
-		char *arg = *argv;
-
-		if (*arg == '-') {
-			if (!prefixcmp(arg, "--receive-pack=")) {
-				receivepack = arg + 15;
-				continue;
-			}
-			if (!prefixcmp(arg, "--exec=")) {
-				receivepack = arg + 7;
-				continue;
-			}
-			if (!prefixcmp(arg, "--remote=")) {
-				remote_name = arg + 9;
-				continue;
-			}
-			if (!strcmp(arg, "--all")) {
-				send_all = 1;
-				continue;
-			}
-			if (!strcmp(arg, "--dry-run")) {
-				dry_run = 1;
-				continue;
-			}
-			if (!strcmp(arg, "--force")) {
-				force_update = 1;
-				continue;
-			}
-			if (!strcmp(arg, "--verbose")) {
-				verbose = 1;
-				continue;
-			}
-			if (!strcmp(arg, "--thin")) {
-				use_thin_pack = 1;
-				continue;
-			}
-			usage(send_pack_usage);
-		}
-		if (!dest) {
-			dest = arg;
-			continue;
-		}
-		heads = argv;
-		nr_heads = argc - i;
-		break;
-	}
-	if (!dest)
-		usage(send_pack_usage);
-	if (heads && send_all)
-		usage(send_pack_usage);
-	verify_remote_names(nr_heads, heads);
-
-	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);
-		}
-	}
-
-	conn = git_connect(fd, dest, receivepack, verbose ? CONNECT_VERBOSE : 0);
-	ret = send_pack(fd[0], fd[1], remote, nr_heads, heads);
-	close(fd[0]);
-	close(fd[1]);
-	ret |= finish_connect(conn);
-	return !!ret;
-}
diff --git a/send-pack.h b/send-pack.h
new file mode 100644
index 0000000..8ff1dc3
--- /dev/null
+++ b/send-pack.h
@@ -0,0 +1,18 @@
+#ifndef SEND_PACK_H
+#define SEND_PACK_H
+
+struct send_pack_args {
+	const char *receivepack;
+	unsigned verbose:1,
+		send_all:1,
+		send_mirror:1,
+		force_update:1,
+		use_thin_pack:1,
+		dry_run:1;
+};
+
+int send_pack(struct send_pack_args *args,
+	      const char *dest, struct remote *remote,
+	      int nr_heads, const char **heads);
+
+#endif
diff --git a/t/t5404-tracking-branches.sh b/t/t5404-tracking-branches.sh
new file mode 100755
index 0000000..1493a92
--- /dev/null
+++ b/t/t5404-tracking-branches.sh
@@ -0,0 +1,53 @@
+#!/bin/sh
+
+test_description='tracking branch update checks for git push'
+
+. ./test-lib.sh
+
+test_expect_success 'setup' '
+	echo 1 >file &&
+	git add file &&
+	git commit -m 1 &&
+	git branch b1 &&
+	git branch b2 &&
+	git clone . aa &&
+	git checkout b1 &&
+	echo b1 >>file &&
+	git commit -a -m b1 &&
+	git checkout b2 &&
+	echo b2 >>file &&
+	git commit -a -m b2
+'
+
+test_expect_success 'prepare pushable branches' '
+	cd aa &&
+	b1=$(git rev-parse origin/b1) &&
+	b2=$(git rev-parse origin/b2) &&
+	git checkout -b b1 origin/b1 &&
+	echo aa-b1 >>file &&
+	git commit -a -m aa-b1 &&
+	git checkout -b b2 origin/b2 &&
+	echo aa-b2 >>file &&
+	git commit -a -m aa-b2 &&
+	git checkout master &&
+	echo aa-master >>file &&
+	git commit -a -m aa-master
+'
+
+test_expect_success 'mixed-success push returns error' '! git push'
+
+test_expect_success 'check tracking branches updated correctly after push' '
+	test "$(git rev-parse origin/master)" = "$(git rev-parse master)"
+'
+
+test_expect_success 'check tracking branches not updated for failed refs' '
+	test "$(git rev-parse origin/b1)" = "$b1" &&
+	test "$(git rev-parse origin/b2)" = "$b2"
+'
+
+test_expect_success 'deleted branches have their tracking branches removed' '
+	git push origin :b1 &&
+	test "$(git rev-parse origin/b1)" = "origin/b1"
+'
+
+test_done
diff --git a/t/t5405-send-pack-rewind.sh b/t/t5405-send-pack-rewind.sh
new file mode 100755
index 0000000..86abc62
--- /dev/null
+++ b/t/t5405-send-pack-rewind.sh
@@ -0,0 +1,42 @@
+#!/bin/sh
+
+test_description='forced push to replace commit we do not have'
+
+. ./test-lib.sh
+
+test_expect_success setup '
+
+	>file1 && git add file1 && test_tick &&
+	git commit -m Initial &&
+
+	mkdir another && (
+		cd another &&
+		git init &&
+		git fetch .. master:master
+	) &&
+
+	>file2 && git add file2 && test_tick &&
+	git commit -m Second
+
+'
+
+test_expect_success 'non forced push should die not segfault' '
+
+	(
+		cd another &&
+		git push .. master:master
+		test $? = 1
+	)
+
+'
+
+test_expect_success 'forced push should succeed' '
+
+	(
+		cd another &&
+		git push .. +master:master
+	)
+
+'
+
+test_done
diff --git a/t/t5406-remote-rejects.sh b/t/t5406-remote-rejects.sh
new file mode 100755
index 0000000..46b2cb4
--- /dev/null
+++ b/t/t5406-remote-rejects.sh
@@ -0,0 +1,24 @@
+#!/bin/sh
+
+test_description='remote push rejects are reported by client'
+
+. ./test-lib.sh
+
+test_expect_success 'setup' '
+	mkdir .git/hooks &&
+	(echo "#!/bin/sh" ; echo "exit 1") >.git/hooks/update &&
+	chmod +x .git/hooks/update &&
+	echo 1 >file &&
+	git add file &&
+	git commit -m 1 &&
+	git clone . child &&
+	cd child &&
+	echo 2 >file &&
+	git commit -a -m 2
+'
+
+test_expect_success 'push reports error' '! git push 2>stderr'
+
+test_expect_success 'individual ref reports error' 'grep rejected stderr'
+
+test_done
diff --git a/t/t5512-ls-remote.sh b/t/t5512-ls-remote.sh
new file mode 100755
index 0000000..6ec5f7c
--- /dev/null
+++ b/t/t5512-ls-remote.sh
@@ -0,0 +1,52 @@
+#!/bin/sh
+
+test_description='git ls-remote'
+
+. ./test-lib.sh
+
+test_expect_success setup '
+
+	>file &&
+	git add file &&
+	test_tick &&
+	git commit -m initial &&
+	git tag mark &&
+	git show-ref --tags -d | sed -e "s/ /	/" >expected.tag &&
+	(
+		echo "$(git rev-parse HEAD)	HEAD"
+		git show-ref -d	| sed -e "s/ /	/"
+	) >expected.all &&
+
+	git remote add self $(pwd)/.git
+
+'
+
+test_expect_success 'ls-remote --tags .git' '
+
+	git ls-remote --tags .git >actual &&
+	diff -u expected.tag actual
+
+'
+
+test_expect_success 'ls-remote .git' '
+
+	git ls-remote .git >actual &&
+	diff -u expected.all actual
+
+'
+
+test_expect_success 'ls-remote --tags self' '
+
+	git ls-remote --tags self >actual &&
+	diff -u expected.tag actual
+
+'
+
+test_expect_success 'ls-remote self' '
+
+	git ls-remote self >actual &&
+	diff -u expected.all actual
+
+'
+
+test_done
diff --git a/t/t5517-push-mirror.sh b/t/t5517-push-mirror.sh
new file mode 100755
index 0000000..ed3fec1
--- /dev/null
+++ b/t/t5517-push-mirror.sh
@@ -0,0 +1,228 @@
+#!/bin/sh
+
+test_description='pushing to a mirror repository'
+
+. ./test-lib.sh
+
+D=`pwd`
+
+invert () {
+	if "$@"; then
+		return 1
+	else
+		return 0
+	fi
+}
+
+mk_repo_pair () {
+	rm -rf master mirror &&
+	mkdir mirror &&
+	(
+		cd mirror &&
+		git init
+	) &&
+	mkdir master &&
+	(
+		cd master &&
+		git init &&
+		git config remote.up.url ../mirror
+	)
+}
+
+
+# BRANCH tests
+test_expect_success 'push mirror creates new branches' '
+
+	mk_repo_pair &&
+	(
+		cd master &&
+		echo one >foo && git add foo && git commit -m one &&
+		git push --mirror up
+	) &&
+	master_master=$(cd master && git show-ref -s --verify refs/heads/master) &&
+	mirror_master=$(cd mirror && git show-ref -s --verify refs/heads/master) &&
+	test "$master_master" = "$mirror_master"
+
+'
+
+test_expect_success 'push mirror updates existing branches' '
+
+	mk_repo_pair &&
+	(
+		cd master &&
+		echo one >foo && git add foo && git commit -m one &&
+		git push --mirror up &&
+		echo two >foo && git add foo && git commit -m two &&
+		git push --mirror up
+	) &&
+	master_master=$(cd master && git show-ref -s --verify refs/heads/master) &&
+	mirror_master=$(cd mirror && git show-ref -s --verify refs/heads/master) &&
+	test "$master_master" = "$mirror_master"
+
+'
+
+test_expect_success 'push mirror force updates existing branches' '
+
+	mk_repo_pair &&
+	(
+		cd master &&
+		echo one >foo && git add foo && git commit -m one &&
+		git push --mirror up &&
+		echo two >foo && git add foo && git commit -m two &&
+		git push --mirror up &&
+		git reset --hard HEAD^
+		git push --mirror up
+	) &&
+	master_master=$(cd master && git show-ref -s --verify refs/heads/master) &&
+	mirror_master=$(cd mirror && git show-ref -s --verify refs/heads/master) &&
+	test "$master_master" = "$mirror_master"
+
+'
+
+test_expect_success 'push mirror removes branches' '
+
+	mk_repo_pair &&
+	(
+		cd master &&
+		echo one >foo && git add foo && git commit -m one &&
+		git branch remove master &&
+		git push --mirror up &&
+		git branch -D remove
+		git push --mirror up
+	) &&
+	(
+		cd mirror &&
+		invert git show-ref -s --verify refs/heads/remove
+	)
+
+'
+
+test_expect_success 'push mirror adds, updates and removes branches together' '
+
+	mk_repo_pair &&
+	(
+		cd master &&
+		echo one >foo && git add foo && git commit -m one &&
+		git branch remove master &&
+		git push --mirror up &&
+		git branch -D remove &&
+		git branch add master &&
+		echo two >foo && git add foo && git commit -m two &&
+		git push --mirror up
+	) &&
+	master_master=$(cd master && git show-ref -s --verify refs/heads/master) &&
+	master_add=$(cd master && git show-ref -s --verify refs/heads/add) &&
+	mirror_master=$(cd mirror && git show-ref -s --verify refs/heads/master) &&
+	mirror_add=$(cd mirror && git show-ref -s --verify refs/heads/add) &&
+	test "$master_master" = "$mirror_master" &&
+	test "$master_add" = "$mirror_add" &&
+	(
+		cd mirror &&
+		invert git show-ref -s --verify refs/heads/remove
+	)
+
+'
+
+
+# TAG tests
+test_expect_success 'push mirror creates new tags' '
+
+	mk_repo_pair &&
+	(
+		cd master &&
+		echo one >foo && git add foo && git commit -m one &&
+		git tag -f tmaster master &&
+		git push --mirror up
+	) &&
+	master_master=$(cd master && git show-ref -s --verify refs/tags/tmaster) &&
+	mirror_master=$(cd mirror && git show-ref -s --verify refs/tags/tmaster) &&
+	test "$master_master" = "$mirror_master"
+
+'
+
+test_expect_success 'push mirror updates existing tags' '
+
+	mk_repo_pair &&
+	(
+		cd master &&
+		echo one >foo && git add foo && git commit -m one &&
+		git tag -f tmaster master &&
+		git push --mirror up &&
+		echo two >foo && git add foo && git commit -m two &&
+		git tag -f tmaster master &&
+		git push --mirror up
+	) &&
+	master_master=$(cd master && git show-ref -s --verify refs/tags/tmaster) &&
+	mirror_master=$(cd mirror && git show-ref -s --verify refs/tags/tmaster) &&
+	test "$master_master" = "$mirror_master"
+
+'
+
+test_expect_success 'push mirror force updates existing tags' '
+
+	mk_repo_pair &&
+	(
+		cd master &&
+		echo one >foo && git add foo && git commit -m one &&
+		git tag -f tmaster master &&
+		git push --mirror up &&
+		echo two >foo && git add foo && git commit -m two &&
+		git tag -f tmaster master &&
+		git push --mirror up &&
+		git reset --hard HEAD^
+		git tag -f tmaster master &&
+		git push --mirror up
+	) &&
+	master_master=$(cd master && git show-ref -s --verify refs/tags/tmaster) &&
+	mirror_master=$(cd mirror && git show-ref -s --verify refs/tags/tmaster) &&
+	test "$master_master" = "$mirror_master"
+
+'
+
+test_expect_success 'push mirror removes tags' '
+
+	mk_repo_pair &&
+	(
+		cd master &&
+		echo one >foo && git add foo && git commit -m one &&
+		git tag -f tremove master &&
+		git push --mirror up &&
+		git tag -d tremove
+		git push --mirror up
+	) &&
+	(
+		cd mirror &&
+		invert git show-ref -s --verify refs/tags/tremove
+	)
+
+'
+
+test_expect_success 'push mirror adds, updates and removes tags together' '
+
+	mk_repo_pair &&
+	(
+		cd master &&
+		echo one >foo && git add foo && git commit -m one &&
+		git tag -f tmaster master &&
+		git tag -f tremove master &&
+		git push --mirror up &&
+		git tag -d tremove &&
+		git tag tadd master &&
+		echo two >foo && git add foo && git commit -m two &&
+		git tag -f tmaster master &&
+		git push --mirror up
+	) &&
+	master_master=$(cd master && git show-ref -s --verify refs/tags/tmaster) &&
+	master_add=$(cd master && git show-ref -s --verify refs/tags/tadd) &&
+	mirror_master=$(cd mirror && git show-ref -s --verify refs/tags/tmaster) &&
+	mirror_add=$(cd mirror && git show-ref -s --verify refs/tags/tadd) &&
+	test "$master_master" = "$mirror_master" &&
+	test "$master_add" = "$mirror_add" &&
+	(
+		cd mirror &&
+		invert git show-ref -s --verify refs/tags/tremove
+	)
+
+'
+
+test_done
diff --git a/transport.c b/transport.c
index 43b9e7c..50db980 100644
--- a/transport.c
+++ b/transport.c
@@ -6,6 +6,7 @@
 #endif
 #include "pkt-line.h"
 #include "fetch-pack.h"
+#include "send-pack.h"
 #include "walker.h"
 #include "bundle.h"
 #include "dir.h"
@@ -141,7 +142,7 @@ static void insert_packed_refs(const char *packed_refs, struct ref **list)
 	}
 }
 
-static struct ref *get_refs_via_rsync(const struct transport *transport)
+static struct ref *get_refs_via_rsync(struct transport *transport)
 {
 	struct strbuf buf = STRBUF_INIT, temp_dir = STRBUF_INIT;
 	struct ref dummy, *tail = &dummy;
@@ -283,6 +284,9 @@ static int rsync_transport_push(struct transport *transport,
 	struct child_process rsync;
 	const char *args[10];
 
+	if (flags & TRANSPORT_PUSH_MIRROR)
+		return error("rsync transport does not support mirror mode");
+
 	/* first push the objects */
 
 	strbuf_addstr(&buf, transport->url);
@@ -388,6 +392,9 @@ static int curl_transport_push(struct transport *transport, int refspec_nr, cons
 	int argc;
 	int err;
 
+	if (flags & TRANSPORT_PUSH_MIRROR)
+		return error("http transport does not support mirror mode");
+
 	argv = xmalloc((refspec_nr + 12) * sizeof(char *));
 	argv[0] = "http-push";
 	argc = 1;
@@ -432,7 +439,7 @@ static int missing__target(int code, int result)
 
 #define missing_target(a) missing__target((a)->http_code, (a)->curl_result)
 
-static struct ref *get_refs_via_curl(const struct transport *transport)
+static struct ref *get_refs_via_curl(struct transport *transport)
 {
 	struct buffer buffer;
 	char *data, *start, *mid;
@@ -529,7 +536,7 @@ struct bundle_transport_data {
 	struct bundle_header header;
 };
 
-static struct ref *get_refs_from_bundle(const struct transport *transport)
+static struct ref *get_refs_from_bundle(struct transport *transport)
 {
 	struct bundle_transport_data *data = transport->data;
 	struct ref *result = NULL;
@@ -601,7 +608,7 @@ static int set_git_option(struct transport *connection,
 	return 1;
 }
 
-static struct ref *get_refs_via_connect(const struct transport *transport)
+static struct ref *get_refs_via_connect(struct transport *transport)
 {
 	struct git_transport_data *data = transport->data;
 	struct ref *refs;
@@ -654,50 +661,17 @@ static int fetch_refs_via_pack(struct transport *transport,
 static int git_transport_push(struct transport *transport, int refspec_nr, const char **refspec, int flags)
 {
 	struct git_transport_data *data = transport->data;
-	const char **argv;
-	char *rem;
-	int argc;
-	int err;
+	struct send_pack_args args;
 
-	argv = xmalloc((refspec_nr + 12) * sizeof(char *));
-	argv[0] = "send-pack";
-	argc = 1;
-	if (flags & TRANSPORT_PUSH_ALL)
-		argv[argc++] = "--all";
-	if (flags & TRANSPORT_PUSH_FORCE)
-		argv[argc++] = "--force";
-	if (flags & TRANSPORT_PUSH_DRY_RUN)
-		argv[argc++] = "--dry-run";
-	if (flags & TRANSPORT_PUSH_VERBOSE)
-		argv[argc++] = "--verbose";
-	if (data->receivepack) {
-		char *rp = xmalloc(strlen(data->receivepack) + 16);
-		sprintf(rp, "--receive-pack=%s", data->receivepack);
-		argv[argc++] = rp;
-	}
-	if (data->thin)
-		argv[argc++] = "--thin";
-	rem = xmalloc(strlen(transport->remote->name) + 10);
-	sprintf(rem, "--remote=%s", transport->remote->name);
-	argv[argc++] = rem;
-	argv[argc++] = transport->url;
-	while (refspec_nr--)
-		argv[argc++] = *refspec++;
-	argv[argc] = NULL;
-	err = run_command_v_opt(argv, RUN_GIT_CMD);
-	switch (err) {
-	case -ERR_RUN_COMMAND_FORK:
-		error("unable to fork for %s", argv[0]);
-	case -ERR_RUN_COMMAND_EXEC:
-		error("unable to exec %s", argv[0]);
-		break;
-	case -ERR_RUN_COMMAND_WAITPID:
-	case -ERR_RUN_COMMAND_WAITPID_WRONG_PID:
-	case -ERR_RUN_COMMAND_WAITPID_SIGNAL:
-	case -ERR_RUN_COMMAND_WAITPID_NOEXIT:
-		error("%s died with strange error", argv[0]);
-	}
-	return !!err;
+	args.receivepack = data->receivepack;
+	args.send_all = !!(flags & TRANSPORT_PUSH_ALL);
+	args.send_mirror = !!(flags & TRANSPORT_PUSH_MIRROR);
+	args.force_update = !!(flags & TRANSPORT_PUSH_FORCE);
+	args.use_thin_pack = data->thin;
+	args.verbose = !!(flags & TRANSPORT_PUSH_VERBOSE);
+	args.dry_run = !!(flags & TRANSPORT_PUSH_DRY_RUN);
+
+	return send_pack(&args, transport->url, transport->remote, refspec_nr, refspec);
 }
 
 static int disconnect_git(struct transport *transport)
@@ -789,7 +763,7 @@ int transport_push(struct transport *transport,
 	return transport->push(transport, refspec_nr, refspec, flags);
 }
 
-struct ref *transport_get_remote_refs(struct transport *transport)
+const struct ref *transport_get_remote_refs(struct transport *transport)
 {
 	if (!transport->remote_refs)
 		transport->remote_refs = transport->get_refs_list(transport);
diff --git a/transport.h b/transport.h
index 2f80ab4..6fb4526 100644
--- a/transport.h
+++ b/transport.h
@@ -8,7 +8,7 @@ struct transport {
 	struct remote *remote;
 	const char *url;
 	void *data;
-	struct ref *remote_refs;
+	const struct ref *remote_refs;
 
 	/**
 	 * Returns 0 if successful, positive if the option is not
@@ -18,7 +18,7 @@ struct transport {
 	int (*set_option)(struct transport *connection, const char *name,
 			  const char *value);
 
-	struct ref *(*get_refs_list)(const struct transport *transport);
+	struct ref *(*get_refs_list)(struct transport *transport);
 	int (*fetch)(struct transport *transport, int refs_nr, struct ref **refs);
 	int (*push)(struct transport *connection, int refspec_nr, const char **refspec, int flags);
 
@@ -30,7 +30,8 @@ struct transport {
 #define TRANSPORT_PUSH_ALL 1
 #define TRANSPORT_PUSH_FORCE 2
 #define TRANSPORT_PUSH_DRY_RUN 4
-#define TRANSPORT_PUSH_VERBOSE 8
+#define TRANSPORT_PUSH_MIRROR 8
+#define TRANSPORT_PUSH_VERBOSE 16
 
 /* Returns a transport suitable for the url */
 struct transport *transport_get(struct remote *, const char *);
@@ -62,7 +63,7 @@ int transport_set_option(struct transport *transport, const char *name,
 int transport_push(struct transport *connection,
 		   int refspec_nr, const char **refspec, int flags);
 
-struct ref *transport_get_remote_refs(struct transport *transport);
+const struct ref *transport_get_remote_refs(struct transport *transport);
 
 int transport_fetch_refs(struct transport *transport, struct ref *refs);
 void transport_unlock_pack(struct transport *transport);