[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(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);
		close(pipe_fd[0]);
		close(pipe_fd[1]);
		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]);
	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(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	*/
e40a9e2c	61	static void rev_list(struct ref *refs)
94fdb7aa LT	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	73	dup2(pipe_fd[0], 0);
94fdb7aa LT	74	close(pipe_fd[0]);
94fdb7aa LT	75	close(pipe_fd[1]);
94fdb7aa LT	76	exec_pack_objects();
	77	die("pack-objects setup failed");
	78	}
	79	if (pack_objects_pid < 0)
	80	die("pack-objects fork failed");
c727fe2a AW	81
c727fe2a AW	82	/* We become rev-list --stdin; output goes to pipe. */
94fdb7aa LT	83	dup2(pipe_fd[1], 1);
	84	close(pipe_fd[0]);
	85	close(pipe_fd[1]);
94fdb7aa LT	86	exec_rev_list(refs);
	87	}
	88
c727fe2a AW	89	/*
	90	* Create "rev-list --stdin \| pack-objects" pipe and feed
	91	* the refs into the pipeline.
	92	*/
	93	static void rev_list_generate(int fd, struct ref *refs)
	94	{
	95	int pipe_fd[2];
	96	pid_t rev_list_generate_pid;
	97
	98	if (pipe(pipe_fd) < 0)
	99	die("rev-list-generate setup: pipe failed");
	100	rev_list_generate_pid = fork();
	101	if (!rev_list_generate_pid) {
	102	/* The child becomes the "rev-list \| pack-objects"
	103	* pipeline. It takes input from us, and its output
	104	* goes to fd.
	105	*/
	106	dup2(pipe_fd[0], 0);
	107	dup2(fd, 1);
	108	close(pipe_fd[0]);
	109	close(pipe_fd[1]);
	110	close(fd);
e40a9e2c	111	rev_list(refs);
c727fe2a AW	112	die("rev-list setup failed");
	113	}
	114	if (rev_list_generate_pid < 0)
	115	die("rev-list-generate fork failed");
	116
	117	/* We feed the rev parameters to them. We do not write into
	118	* fd nor read from the pipe.
	119	*/
	120	close(pipe_fd[0]);
	121	close(fd);
	122	while (refs) {
	123	char buf[42];
	124
	125	if (!is_null_sha1(refs->old_sha1) &&
	126	has_sha1_file(refs->old_sha1)) {
	127	memcpy(buf + 1, sha1_to_hex(refs->old_sha1), 40);
	128	buf[0] = '^';
	129	buf[41] = '\n';
	130	write(pipe_fd[1], buf, 42);
	131	}
	132	if (!is_null_sha1(refs->new_sha1)) {
	133	memcpy(buf, sha1_to_hex(refs->new_sha1), 40);
	134	buf[40] = '\n';
	135	write(pipe_fd[1], buf, 41);
	136	}
	137	refs = refs->next;
	138	}
	139	close(pipe_fd[1]);
	140	// waitpid(rev_list_generate_pid);
	141	exit(0);
	142	}
	143
	144	/*
	145	* Make a pack stream and spit it out into file descriptor fd
	146	*/
aa145403	147	static void pack_objects(int fd, struct ref *refs)
94fdb7aa LT	148	{
	149	pid_t rev_list_pid;
	150
	151	rev_list_pid = fork();
	152	if (!rev_list_pid) {
c727fe2a	153	rev_list_generate(fd, refs);
94fdb7aa LT	154	die("rev-list setup failed");
	155	}
	156	if (rev_list_pid < 0)
	157	die("rev-list fork failed");
	158	/*
	159	* We don't wait for the rev-list pipeline in the parent:
	160	* we end up waiting for the other end instead
	161	*/
	162	}
e4b5c7ff	163
51b0fca0 JH	164	static void unmark_and_free(struct commit_list *list, unsigned int mark)
	165	{
	166	while (list) {
	167	struct commit_list *temp = list;
	168	temp->item->object.flags &= ~mark;
	169	list = temp->next;
	170	free(temp);
	171	}
	172	}
	173
37fde874 JH	174	static int ref_newer(const unsigned char *new_sha1,
37fde874 JH	175	const unsigned char *old_sha1)
584c6cc9	176	{
37fde874 JH	177	struct object *o;
37fde874 JH	178	struct commit old, new;
51b0fca0 JH	179	struct commit_list list, used;
51b0fca0 JH	180	int found = 0;
2a9c3fe8	181
37fde874 JH	182	/* Both new and old must be commit-ish and new is descendant of
	183	* old. Otherwise we require --force.
	184	*/
9534f40b	185	o = deref_tag(parse_object(old_sha1), NULL, 0);
1974632c	186	if (!o \|\| o->type != OBJ_COMMIT)
584c6cc9	187	return 0;
37fde874 JH	188	old = (struct commit *) o;
37fde874 JH	189
9534f40b	190	o = deref_tag(parse_object(new_sha1), NULL, 0);
1974632c	191	if (!o \|\| o->type != OBJ_COMMIT)
2a9c3fe8	192	return 0;
37fde874 JH	193	new = (struct commit *) o;
37fde874 JH	194
2a9c3fe8 LT	195	if (parse_commit(new) < 0)
2a9c3fe8 LT	196	return 0;
51b0fca0 JH	197
51b0fca0 JH	198	used = list = NULL;
2a9c3fe8	199	commit_list_insert(new, &list);
bdf25142 LT	200	while (list) {
bdf25142 LT	201	new = pop_most_recent_commit(&list, 1);
51b0fca0 JH	202	commit_list_insert(new, &used);
	203	if (new == old) {
	204	found = 1;
	205	break;
	206	}
2a9c3fe8	207	}
51b0fca0 JH	208	unmark_and_free(list, 1);
	209	unmark_and_free(used, 1);
	210	return found;
584c6cc9 LT	211	}
584c6cc9 LT	212
f88395ac JH	213	static struct ref local_refs, *local_tail;
f88395ac JH	214	static struct ref remote_refs, *remote_tail;
584c6cc9	215
8da19775	216	static int one_local_ref(const char refname, const unsigned char sha1, int flag, void *cb_data)
584c6cc9 LT	217	{
584c6cc9 LT	218	struct ref *ref;
f88395ac JH	219	int len = strlen(refname) + 1;
f88395ac JH	220	ref = xcalloc(1, sizeof(*ref) + len);
e702496e	221	hashcpy(ref->new_sha1, sha1);
584c6cc9	222	memcpy(ref->name, refname, len);
f88395ac JH	223	*local_tail = ref;
f88395ac JH	224	local_tail = &ref->next;
584c6cc9 LT	225	return 0;
	226	}
	227
f88395ac JH	228	static void get_local_heads(void)
	229	{
	230	local_tail = &local_refs;
cb5d709f	231	for_each_ref(one_local_ref, NULL);
f88395ac JH	232	}
f88395ac JH	233
cfee10a7 JH	234	static int receive_status(int in)
	235	{
	236	char line[1000];
	237	int ret = 0;
	238	int len = packet_read_line(in, line, sizeof(line));
	239	if (len < 10 \|\| memcmp(line, "unpack ", 7)) {
	240	fprintf(stderr, "did not receive status back\n");
	241	return -1;
	242	}
	243	if (memcmp(line, "unpack ok\n", 10)) {
	244	fputs(line, stderr);
	245	ret = -1;
	246	}
	247	while (1) {
	248	len = packet_read_line(in, line, sizeof(line));
	249	if (!len)
	250	break;
	251	if (len < 3 \|\|
	252	(memcmp(line, "ok", 2) && memcmp(line, "ng", 2))) {
	253	fprintf(stderr, "protocol error: %s\n", line);
	254	ret = -1;
	255	break;
	256	}
	257	if (!memcmp(line, "ok", 2))
	258	continue;
	259	fputs(line, stderr);
	260	ret = -1;
	261	}
	262	return ret;
	263	}
	264
f88395ac	265	static int send_pack(int in, int out, int nr_refspec, char **refspec)
61221472	266	{
7f8e9828	267	struct ref *ref;
584c6cc9	268	int new_refs;
ed24928e	269	int ret = 0;
cfee10a7	270	int ask_for_status_report = 0;
d4f694ba	271	int allow_deleting_refs = 0;
cfee10a7	272	int expect_status_report = 0;
7f8e9828	273
f88395ac	274	/* No funny business with the matcher */
2718ff09	275	remote_tail = get_remote_heads(in, &remote_refs, 0, NULL, REF_NORMAL);
f88395ac	276	get_local_heads();
584c6cc9	277
cfee10a7 JH	278	/* Does the other end support the reporting? */
	279	if (server_supports("report-status"))
	280	ask_for_status_report = 1;
d4f694ba JH	281	if (server_supports("delete-refs"))
d4f694ba JH	282	allow_deleting_refs = 1;
cfee10a7	283
f88395ac JH	284	/* match them up */
	285	if (!remote_tail)
	286	remote_tail = &remote_refs;
	287	if (match_refs(local_refs, remote_refs, &remote_tail,
	288	nr_refspec, refspec, send_all))
	289	return -1;
4c353e89 DB	290
	291	if (!remote_refs) {
	292	fprintf(stderr, "No refs in common and none specified; doing nothing.\n");
	293	return 0;
	294	}
	295
584c6cc9	296	/*
f88395ac	297	* Finally, tell the other end!
584c6cc9	298	*/
f88395ac JH	299	new_refs = 0;
	300	for (ref = remote_refs; ref; ref = ref->next) {
	301	char old_hex[60], *new_hex;
d4f694ba JH	302	int delete_ref;
d4f694ba JH	303
f88395ac	304	if (!ref->peer_ref)
7f8e9828	305	continue;
d4f694ba JH	306
	307	delete_ref = is_null_sha1(ref->peer_ref->new_sha1);
	308	if (delete_ref && !allow_deleting_refs) {
	309	error("remote does not support deleting refs");
	310	ret = -2;
	311	continue;
	312	}
	313	if (!delete_ref &&
	314	!hashcmp(ref->old_sha1, ref->peer_ref->new_sha1)) {
41f93a2c LT	315	if (verbose)
41f93a2c LT	316	fprintf(stderr, "'%s': up-to-date\n", ref->name);
37fde874 JH	317	continue;
	318	}
	319
	320	/* This part determines what can overwrite what.
	321	* The rules are:
	322	*
ff27adf3 JH	323	* (0) you can always use --force or +A:B notation to
ff27adf3 JH	324	* selectively force individual ref pairs.
37fde874 JH	325	*
	326	* (1) if the old thing does not exist, it is OK.
	327	*
	328	* (2) if you do not have the old thing, you are not allowed
	329	* to overwrite it; you would not know what you are losing
	330	* otherwise.
	331	*
	332	* (3) if both new and old are commit-ish, and new is a
	333	* descendant of old, it is OK.
d4f694ba JH	334	*
	335	* (4) regardless of all of the above, removing :B is
	336	* always allowed.
37fde874 JH	337	*/
37fde874 JH	338
ff27adf3	339	if (!force_update &&
d4f694ba	340	!delete_ref &&
ff27adf3 JH	341	!is_zero_sha1(ref->old_sha1) &&
ff27adf3 JH	342	!ref->force) {
69310a34 JH	343	if (!has_sha1_file(ref->old_sha1) \|\|
69310a34 JH	344	!ref_newer(ref->peer_ref->new_sha1,
f88395ac	345	ref->old_sha1)) {
69310a34 JH	346	/* We do not have the remote ref, or
	347	* we know that the remote ref is not
	348	* an ancestor of what we are trying to
	349	* push. Either way this can be losing
	350	* commits at the remote end and likely
	351	* we were not up to date to begin with.
	352	*/
	353	error("remote '%s' is not a strict "
	354	"subset of local ref '%s'. "
	355	"maybe you are not up-to-date and "
	356	"need to pull first?",
	357	ref->name,
f88395ac	358	ref->peer_ref->name);
ed24928e	359	ret = -2;
f88395ac JH	360	continue;
f88395ac JH	361	}
e4b5c7ff	362	}
e702496e	363	hashcpy(ref->new_sha1, ref->peer_ref->new_sha1);
d4f694ba JH	364	if (!delete_ref)
d4f694ba JH	365	new_refs++;
7f8e9828 LT	366	strcpy(old_hex, sha1_to_hex(ref->old_sha1));
7f8e9828 LT	367	new_hex = sha1_to_hex(ref->new_sha1);
cfee10a7 JH	368
	369	if (ask_for_status_report) {
	370	packet_write(out, "%s %s %s%c%s",
	371	old_hex, new_hex, ref->name, 0,
	372	"report-status");
	373	ask_for_status_report = 0;
	374	expect_status_report = 1;
	375	}
	376	else
	377	packet_write(out, "%s %s %s",
	378	old_hex, new_hex, ref->name);
d4f694ba JH	379	if (delete_ref)
	380	fprintf(stderr, "deleting '%s'\n", ref->name);
	381	else {
	382	fprintf(stderr, "updating '%s'", ref->name);
	383	if (strcmp(ref->name, ref->peer_ref->name))
	384	fprintf(stderr, " using '%s'",
	385	ref->peer_ref->name);
	386	fprintf(stderr, "\n from %s\n to %s\n",
	387	old_hex, new_hex);
	388	}
61221472	389	}
f88395ac	390
f3a3214e	391	packet_flush(out);
584c6cc9	392	if (new_refs)
f88395ac	393	pack_objects(out, remote_refs);
61221472	394	close(out);
cfee10a7 JH	395
	396	if (expect_status_report) {
	397	if (receive_status(in))
	398	ret = -4;
	399	}
	400
	401	if (!new_refs && ret == 0)
	402	fprintf(stderr, "Everything up-to-date\n");
ed24928e	403	return ret;
61221472 LT	404	}
61221472 LT	405
37adac76 JH	406	static void verify_remote_names(int nr_heads, char **heads)
	407	{
	408	int i;
	409
	410	for (i = 0; i < nr_heads; i++) {
	411	const char *remote = strchr(heads[i], ':');
	412
	413	remote = remote ? (remote + 1) : heads[i];
	414	switch (check_ref_format(remote)) {
	415	case 0: /* ok */
	416	case -2: /* ok but a single level -- that is fine for
	417	* a match pattern.
	418	*/
	419	continue;
	420	}
	421	die("remote part of refspec is not a valid name in %s",
	422	heads[i]);
	423	}
	424	}
f88395ac	425
61221472 LT	426	int main(int argc, char **argv)
	427	{
	428	int i, nr_heads = 0;
	429	char *dest = NULL;
	430	char **heads = NULL;
7f8e9828 LT	431	int fd[2], ret;
7f8e9828 LT	432	pid_t pid;
61221472	433
5a327713	434	setup_git_directory();
84a9b58c JH	435	git_config(git_default_config);
84a9b58c JH	436
61221472	437	argv++;
d089391c LT	438	for (i = 1; i < argc; i++, argv++) {
d089391c LT	439	char arg = argv;
61221472 LT	440
	441	if (*arg == '-') {
	442	if (!strncmp(arg, "--exec=", 7)) {
	443	exec = arg + 7;
	444	continue;
	445	}
d089391c LT	446	if (!strcmp(arg, "--all")) {
	447	send_all = 1;
	448	continue;
	449	}
2a9c3fe8 LT	450	if (!strcmp(arg, "--force")) {
	451	force_update = 1;
	452	continue;
	453	}
41f93a2c LT	454	if (!strcmp(arg, "--verbose")) {
	455	verbose = 1;
	456	continue;
	457	}
2245be3e JH	458	if (!strcmp(arg, "--thin")) {
	459	use_thin_pack = 1;
	460	continue;
	461	}
61221472 LT	462	usage(send_pack_usage);
61221472 LT	463	}
d089391c LT	464	if (!dest) {
	465	dest = arg;
	466	continue;
	467	}
61221472	468	heads = argv;
d089391c	469	nr_heads = argc - i;
61221472 LT	470	break;
	471	}
	472	if (!dest)
	473	usage(send_pack_usage);
0bc3cdfc JH	474	if (heads && send_all)
0bc3cdfc JH	475	usage(send_pack_usage);
37adac76 JH	476	verify_remote_names(nr_heads, heads);
37adac76 JH	477
f7192598	478	pid = git_connect(fd, dest, exec);
7f8e9828	479	if (pid < 0)
61221472	480	return 1;
d0efc8a7	481	ret = send_pack(fd[0], fd[1], nr_heads, heads);
7f8e9828 LT	482	close(fd[0]);
7f8e9828 LT	483	close(fd[1]);
8a5dbef8 FBH	484	ret \|= finish_connect(pid);
8a5dbef8 FBH	485	return !!ret;
61221472	486	}