[thirdparty/git.git] / send-pack.c

#include "cache.h"
#include "commit.h"
#include "tag.h"
#include "refs.h"
#include "pkt-line.h"
#include "exec_cmd.h"

static const char send_pack_usage[] =
"git-send-pack [--all] [--exec=git-receive-pack] <remote> [<head>...]\n"
"  --all and explicit <head> specification are mutually exclusive.";
static const char *exec = "git-receive-pack";
static int verbose;
static int send_all;
static int force_update;
static int use_thin_pack;

static int is_zero_sha1(const unsigned char *sha1)
{
	int i;

	for (i = 0; i < 20; i++) {
		if (*sha1++)
			return 0;
	}
	return 1;
}

static void exec_pack_objects(void)
{
	static const char *args[] = {
		"pack-objects",
		"--all-progress",
		"--stdout",
		NULL
	};
	execv_git_cmd(args);
	die("git-pack-objects exec failed (%s)", strerror(errno));
}

static void exec_rev_list(struct ref *refs)
{
	static const char *args[4];
	int i = 0;

	args[i++] = "rev-list";	/* 0 */
	if (use_thin_pack)	/* 1 */
		args[i++] = "--objects-edge";
	else
		args[i++] = "--objects";

	args[i++] = "--stdin";

	args[i] = NULL;
	execv_git_cmd(args);
	die("git-rev-list exec failed (%s)", strerror(errno));
}

/*
 * Run "rev-list --stdin | pack-objects" pipe.
 */
static void rev_list(int fd, struct ref *refs)
{
	int pipe_fd[2];
	pid_t pack_objects_pid;

	if (pipe(pipe_fd) < 0)
		die("rev-list setup: pipe failed");
	pack_objects_pid = fork();
	if (!pack_objects_pid) {
		/* The child becomes pack-objects; reads from pipe
		 * and writes to the original fd
		 */
		dup2(pipe_fd[0], 0);
		dup2(fd, 1);
		close(pipe_fd[0]);
		close(pipe_fd[1]);
		close(fd);
		exec_pack_objects();
		die("pack-objects setup failed");
	}
	if (pack_objects_pid < 0)
		die("pack-objects fork failed");

	/* We become rev-list --stdin; output goes to pipe. */
	dup2(pipe_fd[1], 1);
	close(pipe_fd[0]);
	close(pipe_fd[1]);
	close(fd);
	exec_rev_list(refs);
}

/*
 * Create "rev-list --stdin | pack-objects" pipe and feed
 * the refs into the pipeline.
 */
static void rev_list_generate(int fd, struct ref *refs)
{
	int pipe_fd[2];
	pid_t rev_list_generate_pid;

	if (pipe(pipe_fd) < 0)
		die("rev-list-generate setup: pipe failed");
	rev_list_generate_pid = fork();
	if (!rev_list_generate_pid) {
		/* The child becomes the "rev-list | pack-objects"
		 * pipeline.  It takes input from us, and its output
		 * goes to fd.
		 */
		dup2(pipe_fd[0], 0);
		dup2(fd, 1);
		close(pipe_fd[0]);
		close(pipe_fd[1]);
		close(fd);
		rev_list(fd, refs);
		die("rev-list setup failed");
	}
	if (rev_list_generate_pid < 0)
		die("rev-list-generate fork failed");

	/* We feed the rev parameters to them.  We do not write into
	 * fd nor read from the pipe.
	 */
	close(pipe_fd[0]);
	close(fd);
	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';
			write(pipe_fd[1], buf, 42);
		}
		if (!is_null_sha1(refs->new_sha1)) {
			memcpy(buf, sha1_to_hex(refs->new_sha1), 40);
			buf[40] = '\n';
			write(pipe_fd[1], buf, 41);
		}
		refs = refs->next;
	}
	close(pipe_fd[1]);
	// waitpid(rev_list_generate_pid);
	exit(0);
}

/*
 * Make a pack stream and spit it out into file descriptor fd
 */
static void pack_objects(int fd, struct ref *refs)
{
	pid_t rev_list_pid;

	rev_list_pid = fork();
	if (!rev_list_pid) {
		rev_list_generate(fd, refs);
		die("rev-list setup failed");
	}
	if (rev_list_pid < 0)
		die("rev-list fork failed");
	/*
	 * We don't wait for the rev-list pipeline in the parent:
	 * we end up waiting for the other end instead
	 */
}

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 int send_pack(int in, int out, 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");
		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 delete_ref;

		if (!ref->peer_ref)
			continue;

		delete_ref = is_null_sha1(ref->peer_ref->new_sha1);
		if (delete_ref && !allow_deleting_refs) {
			error("remote does not support deleting refs");
			ret = -2;
			continue;
		}
		if (!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 &&
		    !delete_ref &&
		    !is_zero_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 a strict "
				      "subset of local ref '%s'. "
				      "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 (!delete_ref)
			new_refs++;
		strcpy(old_hex, sha1_to_hex(ref->old_sha1));
		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);
		if (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)
		pack_objects(out, remote_refs);
	close(out);

	if (expect_status_report) {
		if (receive_status(in))
			ret = -4;
	}

	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.
			  */
			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;
	pid_t pid;

	setup_git_directory();
	git_config(git_default_config);

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

		if (*arg == '-') {
			if (!strncmp(arg, "--exec=", 7)) {
				exec = arg + 7;
				continue;
			}
			if (!strcmp(arg, "--all")) {
				send_all = 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);

	pid = git_connect(fd, dest, exec);
	if (pid < 0)
		return 1;
	ret = send_pack(fd[0], fd[1], nr_heads, heads);
	close(fd[0]);
	close(fd[1]);
	ret |= finish_connect(pid);
	return !!ret;
}
Commit	Line	Data
61221472	1	#include "cache.h"
2a9c3fe8	2	#include "commit.h"
37fde874	3	#include "tag.h"
584c6cc9	4	#include "refs.h"
f3a3214e	5	#include "pkt-line.h"
77cb17e9	6	#include "exec_cmd.h"
61221472	7
2a245013	8	static const char send_pack_usage[] =
0bc3cdfc JH	9	"git-send-pack [--all] [--exec=git-receive-pack] <remote> [<head>...]\n"
0bc3cdfc JH	10	" --all and explicit <head> specification are mutually exclusive.";
61221472	11	static const char *exec = "git-receive-pack";
96f1e58f DR	12	static int verbose;
	13	static int send_all;
	14	static int force_update;
	15	static int use_thin_pack;
61221472	16
584c6cc9 LT	17	static int is_zero_sha1(const unsigned char *sha1)
	18	{
	19	int i;
	20
	21	for (i = 0; i < 20; i++) {
	22	if (*sha1++)
	23	return 0;
	24	}
	25	return 1;
	26	}
	27
94fdb7aa LT	28	static void exec_pack_objects(void)
94fdb7aa LT	29	{
9201c707	30	static const char *args[] = {
77cb17e9	31	"pack-objects",
fa438a2e	32	"--all-progress",
94fdb7aa LT	33	"--stdout",
	34	NULL
	35	};
77cb17e9	36	execv_git_cmd(args);
94fdb7aa LT	37	die("git-pack-objects exec failed (%s)", strerror(errno));
	38	}
	39
	40	static void exec_rev_list(struct ref *refs)
	41	{
c727fe2a AW	42	static const char *args[4];
c727fe2a AW	43	int i = 0;
94fdb7aa	44
77cb17e9	45	args[i++] = "rev-list"; /* 0 */
2245be3e JH	46	if (use_thin_pack) /* 1 */
	47	args[i++] = "--objects-edge";
	48	else
	49	args[i++] = "--objects";
797656e5	50
c727fe2a	51	args[i++] = "--stdin";
797656e5	52
94fdb7aa	53	args[i] = NULL;
77cb17e9	54	execv_git_cmd(args);
94fdb7aa LT	55	die("git-rev-list exec failed (%s)", strerror(errno));
	56	}
	57
c727fe2a AW	58	/*
	59	* Run "rev-list --stdin \| pack-objects" pipe.
	60	*/
94fdb7aa LT	61	static void rev_list(int fd, struct ref *refs)
	62	{
	63	int pipe_fd[2];
	64	pid_t pack_objects_pid;
	65
	66	if (pipe(pipe_fd) < 0)
	67	die("rev-list setup: pipe failed");
	68	pack_objects_pid = fork();
	69	if (!pack_objects_pid) {
c727fe2a AW	70	/* The child becomes pack-objects; reads from pipe
	71	* and writes to the original fd
	72	*/
94fdb7aa LT	73	dup2(pipe_fd[0], 0);
	74	dup2(fd, 1);
	75	close(pipe_fd[0]);
	76	close(pipe_fd[1]);
	77	close(fd);
	78	exec_pack_objects();
	79	die("pack-objects setup failed");
	80	}
	81	if (pack_objects_pid < 0)
	82	die("pack-objects fork failed");
c727fe2a AW	83
c727fe2a AW	84	/* We become rev-list --stdin; output goes to pipe. */
94fdb7aa LT	85	dup2(pipe_fd[1], 1);
	86	close(pipe_fd[0]);
	87	close(pipe_fd[1]);
	88	close(fd);
	89	exec_rev_list(refs);
	90	}
	91
c727fe2a AW	92	/*
	93	* Create "rev-list --stdin \| pack-objects" pipe and feed
	94	* the refs into the pipeline.
	95	*/
	96	static void rev_list_generate(int fd, struct ref *refs)
	97	{
	98	int pipe_fd[2];
	99	pid_t rev_list_generate_pid;
	100
	101	if (pipe(pipe_fd) < 0)
	102	die("rev-list-generate setup: pipe failed");
	103	rev_list_generate_pid = fork();
	104	if (!rev_list_generate_pid) {
	105	/* The child becomes the "rev-list \| pack-objects"
	106	* pipeline. It takes input from us, and its output
	107	* goes to fd.
	108	*/
	109	dup2(pipe_fd[0], 0);
	110	dup2(fd, 1);
	111	close(pipe_fd[0]);
	112	close(pipe_fd[1]);
	113	close(fd);
	114	rev_list(fd, refs);
	115	die("rev-list setup failed");
	116	}
	117	if (rev_list_generate_pid < 0)
	118	die("rev-list-generate fork failed");
	119
	120	/* We feed the rev parameters to them. We do not write into
	121	* fd nor read from the pipe.
	122	*/
	123	close(pipe_fd[0]);
	124	close(fd);
	125	while (refs) {
	126	char buf[42];
	127
	128	if (!is_null_sha1(refs->old_sha1) &&
	129	has_sha1_file(refs->old_sha1)) {
	130	memcpy(buf + 1, sha1_to_hex(refs->old_sha1), 40);
	131	buf[0] = '^';
	132	buf[41] = '\n';
	133	write(pipe_fd[1], buf, 42);
	134	}
	135	if (!is_null_sha1(refs->new_sha1)) {
	136	memcpy(buf, sha1_to_hex(refs->new_sha1), 40);
	137	buf[40] = '\n';
	138	write(pipe_fd[1], buf, 41);
	139	}
	140	refs = refs->next;
	141	}
	142	close(pipe_fd[1]);
	143	// waitpid(rev_list_generate_pid);
	144	exit(0);
	145	}
	146
	147	/*
	148	* Make a pack stream and spit it out into file descriptor fd
	149	*/
aa145403	150	static void pack_objects(int fd, struct ref *refs)
94fdb7aa LT	151	{
	152	pid_t rev_list_pid;
	153
	154	rev_list_pid = fork();
	155	if (!rev_list_pid) {
c727fe2a	156	rev_list_generate(fd, refs);
94fdb7aa LT	157	die("rev-list setup failed");
	158	}
	159	if (rev_list_pid < 0)
	160	die("rev-list fork failed");
	161	/*
	162	* We don't wait for the rev-list pipeline in the parent:
	163	* we end up waiting for the other end instead
	164	*/
	165	}
e4b5c7ff	166
51b0fca0 JH	167	static void unmark_and_free(struct commit_list *list, unsigned int mark)
	168	{
	169	while (list) {
	170	struct commit_list *temp = list;
	171	temp->item->object.flags &= ~mark;
	172	list = temp->next;
	173	free(temp);
	174	}
	175	}
	176
37fde874 JH	177	static int ref_newer(const unsigned char *new_sha1,
37fde874 JH	178	const unsigned char *old_sha1)
584c6cc9	179	{
37fde874 JH	180	struct object *o;
37fde874 JH	181	struct commit old, new;
51b0fca0 JH	182	struct commit_list list, used;
51b0fca0 JH	183	int found = 0;
2a9c3fe8	184
37fde874 JH	185	/* Both new and old must be commit-ish and new is descendant of
	186	* old. Otherwise we require --force.
	187	*/
9534f40b	188	o = deref_tag(parse_object(old_sha1), NULL, 0);
1974632c	189	if (!o \|\| o->type != OBJ_COMMIT)
584c6cc9	190	return 0;
37fde874 JH	191	old = (struct commit *) o;
37fde874 JH	192
9534f40b	193	o = deref_tag(parse_object(new_sha1), NULL, 0);
1974632c	194	if (!o \|\| o->type != OBJ_COMMIT)
2a9c3fe8	195	return 0;
37fde874 JH	196	new = (struct commit *) o;
37fde874 JH	197
2a9c3fe8 LT	198	if (parse_commit(new) < 0)
2a9c3fe8 LT	199	return 0;
51b0fca0 JH	200
51b0fca0 JH	201	used = list = NULL;
2a9c3fe8	202	commit_list_insert(new, &list);
bdf25142 LT	203	while (list) {
bdf25142 LT	204	new = pop_most_recent_commit(&list, 1);
51b0fca0 JH	205	commit_list_insert(new, &used);
	206	if (new == old) {
	207	found = 1;
	208	break;
	209	}
2a9c3fe8	210	}
51b0fca0 JH	211	unmark_and_free(list, 1);
	212	unmark_and_free(used, 1);
	213	return found;
584c6cc9 LT	214	}
584c6cc9 LT	215
f88395ac JH	216	static struct ref local_refs, *local_tail;
f88395ac JH	217	static struct ref remote_refs, *remote_tail;
584c6cc9	218
8da19775	219	static int one_local_ref(const char refname, const unsigned char sha1, int flag, void *cb_data)
584c6cc9 LT	220	{
584c6cc9 LT	221	struct ref *ref;
f88395ac JH	222	int len = strlen(refname) + 1;
f88395ac JH	223	ref = xcalloc(1, sizeof(*ref) + len);
e702496e	224	hashcpy(ref->new_sha1, sha1);
584c6cc9	225	memcpy(ref->name, refname, len);
f88395ac JH	226	*local_tail = ref;
f88395ac JH	227	local_tail = &ref->next;
584c6cc9 LT	228	return 0;
	229	}
	230
f88395ac JH	231	static void get_local_heads(void)
	232	{
	233	local_tail = &local_refs;
cb5d709f	234	for_each_ref(one_local_ref, NULL);
f88395ac JH	235	}
f88395ac JH	236
cfee10a7 JH	237	static int receive_status(int in)
	238	{
	239	char line[1000];
	240	int ret = 0;
	241	int len = packet_read_line(in, line, sizeof(line));
	242	if (len < 10 \|\| memcmp(line, "unpack ", 7)) {
	243	fprintf(stderr, "did not receive status back\n");
	244	return -1;
	245	}
	246	if (memcmp(line, "unpack ok\n", 10)) {
	247	fputs(line, stderr);
	248	ret = -1;
	249	}
	250	while (1) {
	251	len = packet_read_line(in, line, sizeof(line));
	252	if (!len)
	253	break;
	254	if (len < 3 \|\|
	255	(memcmp(line, "ok", 2) && memcmp(line, "ng", 2))) {
	256	fprintf(stderr, "protocol error: %s\n", line);
	257	ret = -1;
	258	break;
	259	}
	260	if (!memcmp(line, "ok", 2))
	261	continue;
	262	fputs(line, stderr);
	263	ret = -1;
	264	}
	265	return ret;
	266	}
	267
f88395ac	268	static int send_pack(int in, int out, int nr_refspec, char **refspec)
61221472	269	{
7f8e9828	270	struct ref *ref;
584c6cc9	271	int new_refs;
ed24928e	272	int ret = 0;
cfee10a7	273	int ask_for_status_report = 0;
d4f694ba	274	int allow_deleting_refs = 0;
cfee10a7	275	int expect_status_report = 0;
7f8e9828	276
f88395ac	277	/* No funny business with the matcher */
2718ff09	278	remote_tail = get_remote_heads(in, &remote_refs, 0, NULL, REF_NORMAL);
f88395ac	279	get_local_heads();
584c6cc9	280
cfee10a7 JH	281	/* Does the other end support the reporting? */
	282	if (server_supports("report-status"))
	283	ask_for_status_report = 1;
d4f694ba JH	284	if (server_supports("delete-refs"))
d4f694ba JH	285	allow_deleting_refs = 1;
cfee10a7	286
f88395ac JH	287	/* match them up */
	288	if (!remote_tail)
	289	remote_tail = &remote_refs;
	290	if (match_refs(local_refs, remote_refs, &remote_tail,
	291	nr_refspec, refspec, send_all))
	292	return -1;
4c353e89 DB	293
	294	if (!remote_refs) {
	295	fprintf(stderr, "No refs in common and none specified; doing nothing.\n");
	296	return 0;
	297	}
	298
584c6cc9	299	/*
f88395ac	300	* Finally, tell the other end!
584c6cc9	301	*/
f88395ac JH	302	new_refs = 0;
	303	for (ref = remote_refs; ref; ref = ref->next) {
	304	char old_hex[60], *new_hex;
d4f694ba JH	305	int delete_ref;
d4f694ba JH	306
f88395ac	307	if (!ref->peer_ref)
7f8e9828	308	continue;
d4f694ba JH	309
	310	delete_ref = is_null_sha1(ref->peer_ref->new_sha1);
	311	if (delete_ref && !allow_deleting_refs) {
	312	error("remote does not support deleting refs");
	313	ret = -2;
	314	continue;
	315	}
	316	if (!delete_ref &&
	317	!hashcmp(ref->old_sha1, ref->peer_ref->new_sha1)) {
41f93a2c LT	318	if (verbose)
41f93a2c LT	319	fprintf(stderr, "'%s': up-to-date\n", ref->name);
37fde874 JH	320	continue;
	321	}
	322
	323	/* This part determines what can overwrite what.
	324	* The rules are:
	325	*
ff27adf3 JH	326	* (0) you can always use --force or +A:B notation to
ff27adf3 JH	327	* selectively force individual ref pairs.
37fde874 JH	328	*
	329	* (1) if the old thing does not exist, it is OK.
	330	*
	331	* (2) if you do not have the old thing, you are not allowed
	332	* to overwrite it; you would not know what you are losing
	333	* otherwise.
	334	*
	335	* (3) if both new and old are commit-ish, and new is a
	336	* descendant of old, it is OK.
d4f694ba JH	337	*
	338	* (4) regardless of all of the above, removing :B is
	339	* always allowed.
37fde874 JH	340	*/
37fde874 JH	341
ff27adf3	342	if (!force_update &&
d4f694ba	343	!delete_ref &&
ff27adf3 JH	344	!is_zero_sha1(ref->old_sha1) &&
ff27adf3 JH	345	!ref->force) {
69310a34 JH	346	if (!has_sha1_file(ref->old_sha1) \|\|
69310a34 JH	347	!ref_newer(ref->peer_ref->new_sha1,
f88395ac	348	ref->old_sha1)) {
69310a34 JH	349	/* We do not have the remote ref, or
	350	* we know that the remote ref is not
	351	* an ancestor of what we are trying to
	352	* push. Either way this can be losing
	353	* commits at the remote end and likely
	354	* we were not up to date to begin with.
	355	*/
	356	error("remote '%s' is not a strict "
	357	"subset of local ref '%s'. "
	358	"maybe you are not up-to-date and "
	359	"need to pull first?",
	360	ref->name,
f88395ac	361	ref->peer_ref->name);
ed24928e	362	ret = -2;
f88395ac JH	363	continue;
f88395ac JH	364	}
e4b5c7ff	365	}
e702496e	366	hashcpy(ref->new_sha1, ref->peer_ref->new_sha1);
d4f694ba JH	367	if (!delete_ref)
d4f694ba JH	368	new_refs++;
7f8e9828 LT	369	strcpy(old_hex, sha1_to_hex(ref->old_sha1));
7f8e9828 LT	370	new_hex = sha1_to_hex(ref->new_sha1);
cfee10a7 JH	371
	372	if (ask_for_status_report) {
	373	packet_write(out, "%s %s %s%c%s",
	374	old_hex, new_hex, ref->name, 0,
	375	"report-status");
	376	ask_for_status_report = 0;
	377	expect_status_report = 1;
	378	}
	379	else
	380	packet_write(out, "%s %s %s",
	381	old_hex, new_hex, ref->name);
d4f694ba JH	382	if (delete_ref)
	383	fprintf(stderr, "deleting '%s'\n", ref->name);
	384	else {
	385	fprintf(stderr, "updating '%s'", ref->name);
	386	if (strcmp(ref->name, ref->peer_ref->name))
	387	fprintf(stderr, " using '%s'",
	388	ref->peer_ref->name);
	389	fprintf(stderr, "\n from %s\n to %s\n",
	390	old_hex, new_hex);
	391	}
61221472	392	}
f88395ac	393
f3a3214e	394	packet_flush(out);
584c6cc9	395	if (new_refs)
f88395ac	396	pack_objects(out, remote_refs);
61221472	397	close(out);
cfee10a7 JH	398
	399	if (expect_status_report) {
	400	if (receive_status(in))
	401	ret = -4;
	402	}
	403
	404	if (!new_refs && ret == 0)
	405	fprintf(stderr, "Everything up-to-date\n");
ed24928e	406	return ret;
61221472 LT	407	}
61221472 LT	408
37adac76 JH	409	static void verify_remote_names(int nr_heads, char **heads)
	410	{
	411	int i;
	412
	413	for (i = 0; i < nr_heads; i++) {
	414	const char *remote = strchr(heads[i], ':');
	415
	416	remote = remote ? (remote + 1) : heads[i];
	417	switch (check_ref_format(remote)) {
	418	case 0: /* ok */
	419	case -2: /* ok but a single level -- that is fine for
	420	* a match pattern.
	421	*/
	422	continue;
	423	}
	424	die("remote part of refspec is not a valid name in %s",
	425	heads[i]);
	426	}
	427	}
f88395ac	428
61221472 LT	429	int main(int argc, char **argv)
	430	{
	431	int i, nr_heads = 0;
	432	char *dest = NULL;
	433	char **heads = NULL;
7f8e9828 LT	434	int fd[2], ret;
7f8e9828 LT	435	pid_t pid;
61221472	436
5a327713	437	setup_git_directory();
84a9b58c JH	438	git_config(git_default_config);
84a9b58c JH	439
61221472	440	argv++;
d089391c LT	441	for (i = 1; i < argc; i++, argv++) {
d089391c LT	442	char arg = argv;
61221472 LT	443
	444	if (*arg == '-') {
	445	if (!strncmp(arg, "--exec=", 7)) {
	446	exec = arg + 7;
	447	continue;
	448	}
d089391c LT	449	if (!strcmp(arg, "--all")) {
	450	send_all = 1;
	451	continue;
	452	}
2a9c3fe8 LT	453	if (!strcmp(arg, "--force")) {
	454	force_update = 1;
	455	continue;
	456	}
41f93a2c LT	457	if (!strcmp(arg, "--verbose")) {
	458	verbose = 1;
	459	continue;
	460	}
2245be3e JH	461	if (!strcmp(arg, "--thin")) {
	462	use_thin_pack = 1;
	463	continue;
	464	}
61221472 LT	465	usage(send_pack_usage);
61221472 LT	466	}
d089391c LT	467	if (!dest) {
	468	dest = arg;
	469	continue;
	470	}
61221472	471	heads = argv;
d089391c	472	nr_heads = argc - i;
61221472 LT	473	break;
	474	}
	475	if (!dest)
	476	usage(send_pack_usage);
0bc3cdfc JH	477	if (heads && send_all)
0bc3cdfc JH	478	usage(send_pack_usage);
37adac76 JH	479	verify_remote_names(nr_heads, heads);
37adac76 JH	480
f7192598	481	pid = git_connect(fd, dest, exec);
7f8e9828	482	if (pid < 0)
61221472	483	return 1;
d0efc8a7	484	ret = send_pack(fd[0], fd[1], nr_heads, heads);
7f8e9828 LT	485	close(fd[0]);
7f8e9828 LT	486	close(fd[1]);
8a5dbef8 FBH	487	ret \|= finish_connect(pid);
8a5dbef8 FBH	488	return !!ret;
61221472	489	}