Merge branch 'db/remote-builtin' into jk/send-pack

* db/remote-builtin:
  Reteach builtin-ls-remote to understand remotes
  Build in ls-remote
  Use built-in send-pack.
  Build-in send-pack, with an API for other programs to call.
  Build-in peek-remote, using transport infrastructure.
  Miscellaneous const changes and utilities

Conflicts:

	transport.c

17 files changed, 261 insertions, 187 deletions

diff --git a/Makefile b/Makefile
index 9c6776e59..af827f6ef 100644
--- a/Makefile
+++ b/Makefile
@@ -212,7 +212,6 @@ BASIC_LDFLAGS =
 SCRIPT_SH = \
 	git-bisect.sh git-checkout.sh \
 	git-clean.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 \
@@ -241,7 +240,7 @@ 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 \
@@ -347,6 +346,7 @@ 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 \
@@ -359,6 +359,7 @@ 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 5f5b59bfd..6b1750d28 100644
--- a/builtin-fetch.c
+++ b/builtin-fetch.c
@@ -29,7 +29,7 @@ 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)
 {
@@ -77,7 +77,7 @@ 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++) {
@@ -354,12 +354,12 @@ 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 000000000..56f3f8802
--- /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/send-pack.c b/builtin-send-pack.c
index b74fd454f..947c42b95 100644
--- a/send-pack.c
+++ b/builtin-send-pack.c
@@ -5,16 +5,15 @@
 #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] [--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;
+
+static struct send_pack_args args = {
+	/* .receivepack = */ "git-receive-pack",
+};
 
 /*
  * Make a pack stream and spit it out into file descriptor fd
@@ -26,7 +25,7 @@ static int pack_objects(int fd, struct ref *refs)
 	 * the revision parameters to it via its stdin and
 	 * let its stdout go back to the other end.
 	 */
-	const char *args[] = {
+	const char *argv[] = {
 		"pack-objects",
 		"--all-progress",
 		"--revs",
@@ -36,10 +35,10 @@ static int pack_objects(int fd, struct ref *refs)
 	};
 	struct child_process po;
 
-	if (use_thin_pack)
-		args[4] = "--thin";
+	if (args.use_thin_pack)
+		argv[4] = "--thin";
 	memset(&po, 0, sizeof(po));
-	po.argv = args;
+	po.argv = argv;
 	po.in = -1;
 	po.out = fd;
 	po.git_cmd = 1;
@@ -207,7 +206,7 @@ static void update_tracking_ref(struct remote *remote, struct ref *ref)
 	}
 }
 
-static int send_pack(int in, int out, struct remote *remote, int nr_refspec, char **refspec)
+static int do_send_pack(int in, int out, struct remote *remote, int nr_refspec, const char **refspec)
 {
 	struct ref *ref;
 	int new_refs;
@@ -230,7 +229,7 @@ static int send_pack(int in, int out, struct remote *remote, int nr_refspec, cha
 	if (!remote_tail)
 		remote_tail = &remote_refs;
 	if (match_refs(local_refs, remote_refs, &remote_tail,
-		       nr_refspec, refspec, send_all))
+		       nr_refspec, refspec, args.send_all))
 		return -1;
 
 	if (!remote_refs) {
@@ -259,7 +258,7 @@ static int send_pack(int in, int out, struct remote *remote, int nr_refspec, cha
 		}
 		if (!will_delete_ref &&
 		    !hashcmp(ref->old_sha1, ref->peer_ref->new_sha1)) {
-			if (verbose)
+			if (args.verbose)
 				fprintf(stderr, "'%s': up-to-date\n", ref->name);
 			continue;
 		}
@@ -283,7 +282,7 @@ static int send_pack(int in, int out, struct remote *remote, int nr_refspec, cha
 		 *     always allowed.
 		 */
 
-		if (!force_update &&
+		if (!args.force_update &&
 		    !will_delete_ref &&
 		    !is_null_sha1(ref->old_sha1) &&
 		    !ref->force) {
@@ -313,7 +312,7 @@ static int send_pack(int in, int out, struct remote *remote, int nr_refspec, cha
 		strcpy(old_hex, sha1_to_hex(ref->old_sha1));
 		new_hex = sha1_to_hex(ref->new_sha1);
 
-		if (!dry_run) {
+		if (!args.dry_run) {
 			if (ask_for_status_report) {
 				packet_write(out, "%s %s %s%c%s",
 					old_hex, new_hex, ref->name, 0,
@@ -338,7 +337,7 @@ static int send_pack(int in, int out, struct remote *remote, int nr_refspec, cha
 	}
 
 	packet_flush(out);
-	if (new_refs && !dry_run)
+	if (new_refs && !args.dry_run)
 		ret = pack_objects(out, remote_refs);
 	close(out);
 
@@ -347,7 +346,7 @@ static int send_pack(int in, int out, struct remote *remote, int nr_refspec, cha
 			ret = -4;
 	}
 
-	if (!dry_run && remote && ret == 0) {
+	if (!args.dry_run && remote && ret == 0) {
 		for (ref = remote_refs; ref; ref = ref->next)
 			update_tracking_ref(remote, ref);
 	}
@@ -357,7 +356,7 @@ static int send_pack(int in, int out, struct remote *remote, int nr_refspec, cha
 	return ret;
 }
 
-static void verify_remote_names(int nr_heads, char **heads)
+static void verify_remote_names(int nr_heads, const char **heads)
 {
 	int i;
 
@@ -378,30 +377,25 @@ static void verify_remote_names(int nr_heads, char **heads)
 	}
 }
 
-int main(int argc, char **argv)
+int cmd_send_pack(int argc, const char **argv, const char *prefix)
 {
 	int i, nr_heads = 0;
-	char *dest = NULL;
-	char **heads = NULL;
-	int fd[2], ret;
-	struct child_process *conn;
-	char *remote_name = NULL;
+	const char **heads = NULL;
+	const char *remote_name = NULL;
 	struct remote *remote = NULL;
-
-	setup_git_directory();
-	git_config(git_default_config);
+	const char *dest = NULL;
 
 	argv++;
 	for (i = 1; i < argc; i++, argv++) {
-		char *arg = *argv;
+		const char *arg = *argv;
 
 		if (*arg == '-') {
 			if (!prefixcmp(arg, "--receive-pack=")) {
-				receivepack = arg + 15;
+				args.receivepack = arg + 15;
 				continue;
 			}
 			if (!prefixcmp(arg, "--exec=")) {
-				receivepack = arg + 7;
+				args.receivepack = arg + 7;
 				continue;
 			}
 			if (!prefixcmp(arg, "--remote=")) {
@@ -409,23 +403,23 @@ int main(int argc, char **argv)
 				continue;
 			}
 			if (!strcmp(arg, "--all")) {
-				send_all = 1;
+				args.send_all = 1;
 				continue;
 			}
 			if (!strcmp(arg, "--dry-run")) {
-				dry_run = 1;
+				args.dry_run = 1;
 				continue;
 			}
 			if (!strcmp(arg, "--force")) {
-				force_update = 1;
+				args.force_update = 1;
 				continue;
 			}
 			if (!strcmp(arg, "--verbose")) {
-				verbose = 1;
+				args.verbose = 1;
 				continue;
 			}
 			if (!strcmp(arg, "--thin")) {
-				use_thin_pack = 1;
+				args.use_thin_pack = 1;
 				continue;
 			}
 			usage(send_pack_usage);
@@ -434,15 +428,14 @@ int main(int argc, char **argv)
 			dest = arg;
 			continue;
 		}
-		heads = argv;
+		heads = (const char **) argv;
 		nr_heads = argc - i;
 		break;
 	}
 	if (!dest)
 		usage(send_pack_usage);
-	if (heads && send_all)
+	if (heads && args.send_all)
 		usage(send_pack_usage);
-	verify_remote_names(nr_heads, heads);
 
 	if (remote_name) {
 		remote = remote_get(remote_name);
@@ -452,8 +445,22 @@ int main(int argc, char **argv)
 		}
 	}
 
-	conn = git_connect(fd, dest, receivepack, verbose ? CONNECT_VERBOSE : 0);
-	ret = send_pack(fd[0], fd[1], remote, nr_heads, heads);
+	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, nr_heads, heads);
 	close(fd[0]);
 	close(fd[1]);
 	ret |= finish_connect(conn);
diff --git a/builtin.h b/builtin.h
index 9a6213af1..525107f38 100644
--- a/builtin.h
+++ b/builtin.h
@@ -48,6 +48,7 @@ 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);
@@ -69,6 +70,7 @@ 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 f0a25c7ff..e5ea637c2 100644
--- a/cache.h
+++ b/cache.h
@@ -504,7 +504,7 @@ struct ref {
 #define REF_TAGS	(1u << 2)
 
 #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 44e423daf..3aefd4ace 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 fec70bbf8..fec70bbf8 100755
--- a/git-ls-remote.sh
+++ b/contrib/examples/git-ls-remote.sh
diff --git a/git.c b/git.c
index 4a250f7e8..6c5f9af13 100644
--- a/git.c
+++ b/git.c
@@ -321,6 +321,7 @@ 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 },
@@ -328,6 +329,7 @@ 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 },
@@ -342,6 +344,7 @@ 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 9314621a1..99328f590 100644
--- a/http-push.c
+++ b/http-push.c
@@ -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 8d20f7c9c..000000000
--- 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/remote.c b/remote.c
index bec2ba1ad..59defdbf1 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;
@@ -710,7 +722,7 @@ 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 all)
 {
 	struct refspec *rs =
 		parse_ref_spec(nr_refspec, (const char **) refspec);
@@ -810,10 +822,10 @@ 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 +836,7 @@ 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 +854,9 @@ 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 +864,9 @@ 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 +899,7 @@ 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 878b4ecc3..6a4c7a0f3 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.
diff --git a/send-pack.h b/send-pack.h
new file mode 100644
index 000000000..7a24f71c7
--- /dev/null
+++ b/send-pack.h
@@ -0,0 +1,17 @@
+#ifndef SEND_PACK_H
+#define SEND_PACK_H
+
+struct send_pack_args {
+	const char *receivepack;
+	unsigned verbose:1,
+		send_all: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/t5512-ls-remote.sh b/t/t5512-ls-remote.sh
new file mode 100755
index 000000000..6ec5f7c48
--- /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/transport.c b/transport.c
index e8a260837..5cb809bff 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;
@@ -430,7 +431,7 @@ 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;
@@ -527,7 +528,7 @@ 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;
@@ -599,7 +600,7 @@ 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;
@@ -652,50 +653,16 @@ 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.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)
@@ -787,7 +754,7 @@ 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 2f80ab4b0..a2a36d029 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);
 
@@ -62,7 +62,7 @@ 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);