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

#include "cache.h"
#include "commit.h"
#include "tag.h"
#include "refs.h"
#include "pkt-line.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 = 0;
static int send_all = 0;
static int force_update = 0;

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 char *args[] = {
		"git-pack-objects",
		"--stdout",
		NULL
	};
	execvp("git-pack-objects", args);
	die("git-pack-objects exec failed (%s)", strerror(errno));
}

static void exec_rev_list(struct ref *refs)
{
	static char *args[1000];
	int i = 0;

	args[i++] = "git-rev-list";	/* 0 */
	args[i++] = "--objects";	/* 1 */
	while (refs) {
		char *buf = malloc(100);
		if (i > 900)
			die("git-rev-list environment overflow");
		if (!is_zero_sha1(refs->old_sha1) &&
		    has_sha1_file(refs->old_sha1)) {
			args[i++] = buf;
			snprintf(buf, 50, "^%s", sha1_to_hex(refs->old_sha1));
			buf += 50;
		}
		if (!is_zero_sha1(refs->new_sha1)) {
			args[i++] = buf;
			snprintf(buf, 50, "%s", sha1_to_hex(refs->new_sha1));
		}
		refs = refs->next;
	}
	args[i] = NULL;
	execvp("git-rev-list", args);
	die("git-rev-list exec failed (%s)", strerror(errno));
}

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) {
		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");
	dup2(pipe_fd[1], 1);
	close(pipe_fd[0]);
	close(pipe_fd[1]);
	close(fd);
	exec_rev_list(refs);
}

static int pack_objects(int fd, struct ref *refs)
{
	pid_t rev_list_pid;

	rev_list_pid = fork();
	if (!rev_list_pid) {
		rev_list(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
	 */
	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 != commit_type)
		return 0;
	old = (struct commit *) o;

	o = deref_tag(parse_object(new_sha1), NULL, 0);
	if (!o || o->type != commit_type)
		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)
{
	struct ref *ref;
	int len = strlen(refname) + 1;
	ref = xcalloc(1, sizeof(*ref) + len);
	memcpy(ref->new_sha1, sha1, 20);
	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);
}

static int send_pack(int in, int out, int nr_refspec, char **refspec)
{
	struct ref *ref;
	int new_refs;
	int ret = 0;

	/* No funny business with the matcher */
	remote_tail = get_remote_heads(in, &remote_refs, 0, NULL, 1);
	get_local_heads();

	/* 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;
		if (!ref->peer_ref)
			continue;
		if (!memcmp(ref->old_sha1, ref->peer_ref->new_sha1, 20)) {
			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.
		 */

		if (!force_update &&
		    !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;
			}
		}
		memcpy(ref->new_sha1, ref->peer_ref->new_sha1, 20);
		if (is_zero_sha1(ref->new_sha1)) {
			error("cannot happen anymore");
			ret = -3;
			continue;
		}
		new_refs++;
		strcpy(old_hex, sha1_to_hex(ref->old_sha1));
		new_hex = sha1_to_hex(ref->new_sha1);
		packet_write(out, "%s %s %s", old_hex, new_hex, ref->name);
		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);
	else if (ret == 0)
		fprintf(stderr, "Everything up-to-date\n");
	close(out);
	return ret;
}


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();
	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;
			}
			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);
	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]);
	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"
61221472	6
2a245013	7	static const char send_pack_usage[] =
0bc3cdfc JH	8	"git-send-pack [--all] [--exec=git-receive-pack] <remote> [<head>...]\n"
0bc3cdfc JH	9	" --all and explicit <head> specification are mutually exclusive.";
61221472	10	static const char *exec = "git-receive-pack";
41f93a2c	11	static int verbose = 0;
d089391c	12	static int send_all = 0;
2a9c3fe8	13	static int force_update = 0;
61221472	14
584c6cc9 LT	15	static int is_zero_sha1(const unsigned char *sha1)
	16	{
	17	int i;
	18
	19	for (i = 0; i < 20; i++) {
	20	if (*sha1++)
	21	return 0;
	22	}
	23	return 1;
	24	}
	25
94fdb7aa LT	26	static void exec_pack_objects(void)
	27	{
	28	static char *args[] = {
	29	"git-pack-objects",
	30	"--stdout",
	31	NULL
	32	};
	33	execvp("git-pack-objects", args);
	34	die("git-pack-objects exec failed (%s)", strerror(errno));
	35	}
	36
	37	static void exec_rev_list(struct ref *refs)
	38	{
	39	static char *args[1000];
	40	int i = 0;
	41
	42	args[i++] = "git-rev-list"; /* 0 */
	43	args[i++] = "--objects"; /* 1 */
	44	while (refs) {
	45	char *buf = malloc(100);
	46	if (i > 900)
	47	die("git-rev-list environment overflow");
40b64d47 JH	48	if (!is_zero_sha1(refs->old_sha1) &&
40b64d47 JH	49	has_sha1_file(refs->old_sha1)) {
584c6cc9 LT	50	args[i++] = buf;
	51	snprintf(buf, 50, "^%s", sha1_to_hex(refs->old_sha1));
	52	buf += 50;
	53	}
	54	if (!is_zero_sha1(refs->new_sha1)) {
	55	args[i++] = buf;
	56	snprintf(buf, 50, "%s", sha1_to_hex(refs->new_sha1));
	57	}
94fdb7aa LT	58	refs = refs->next;
	59	}
	60	args[i] = NULL;
	61	execvp("git-rev-list", args);
	62	die("git-rev-list exec failed (%s)", strerror(errno));
	63	}
	64
	65	static void rev_list(int fd, struct ref *refs)
	66	{
	67	int pipe_fd[2];
	68	pid_t pack_objects_pid;
	69
	70	if (pipe(pipe_fd) < 0)
	71	die("rev-list setup: pipe failed");
	72	pack_objects_pid = fork();
	73	if (!pack_objects_pid) {
	74	dup2(pipe_fd[0], 0);
	75	dup2(fd, 1);
	76	close(pipe_fd[0]);
	77	close(pipe_fd[1]);
	78	close(fd);
	79	exec_pack_objects();
	80	die("pack-objects setup failed");
	81	}
	82	if (pack_objects_pid < 0)
	83	die("pack-objects fork failed");
	84	dup2(pipe_fd[1], 1);
	85	close(pipe_fd[0]);
	86	close(pipe_fd[1]);
	87	close(fd);
	88	exec_rev_list(refs);
	89	}
	90
	91	static int pack_objects(int fd, struct ref *refs)
	92	{
	93	pid_t rev_list_pid;
	94
	95	rev_list_pid = fork();
	96	if (!rev_list_pid) {
	97	rev_list(fd, refs);
	98	die("rev-list setup failed");
	99	}
	100	if (rev_list_pid < 0)
	101	die("rev-list fork failed");
	102	/*
	103	* We don't wait for the rev-list pipeline in the parent:
	104	* we end up waiting for the other end instead
	105	*/
7ec4e608	106	return 0;
94fdb7aa	107	}
e4b5c7ff	108
51b0fca0 JH	109	static void unmark_and_free(struct commit_list *list, unsigned int mark)
	110	{
	111	while (list) {
	112	struct commit_list *temp = list;
	113	temp->item->object.flags &= ~mark;
	114	list = temp->next;
	115	free(temp);
	116	}
	117	}
	118
37fde874 JH	119	static int ref_newer(const unsigned char *new_sha1,
37fde874 JH	120	const unsigned char *old_sha1)
584c6cc9	121	{
37fde874 JH	122	struct object *o;
37fde874 JH	123	struct commit old, new;
51b0fca0 JH	124	struct commit_list list, used;
51b0fca0 JH	125	int found = 0;
2a9c3fe8	126
37fde874 JH	127	/* Both new and old must be commit-ish and new is descendant of
	128	* old. Otherwise we require --force.
	129	*/
9534f40b	130	o = deref_tag(parse_object(old_sha1), NULL, 0);
37fde874	131	if (!o \|\| o->type != commit_type)
584c6cc9	132	return 0;
37fde874 JH	133	old = (struct commit *) o;
37fde874 JH	134
9534f40b	135	o = deref_tag(parse_object(new_sha1), NULL, 0);
37fde874	136	if (!o \|\| o->type != commit_type)
2a9c3fe8	137	return 0;
37fde874 JH	138	new = (struct commit *) o;
37fde874 JH	139
2a9c3fe8 LT	140	if (parse_commit(new) < 0)
2a9c3fe8 LT	141	return 0;
51b0fca0 JH	142
51b0fca0 JH	143	used = list = NULL;
2a9c3fe8	144	commit_list_insert(new, &list);
bdf25142 LT	145	while (list) {
bdf25142 LT	146	new = pop_most_recent_commit(&list, 1);
51b0fca0 JH	147	commit_list_insert(new, &used);
	148	if (new == old) {
	149	found = 1;
	150	break;
	151	}
2a9c3fe8	152	}
51b0fca0 JH	153	unmark_and_free(list, 1);
	154	unmark_and_free(used, 1);
	155	return found;
584c6cc9 LT	156	}
584c6cc9 LT	157
f88395ac JH	158	static struct ref local_refs, *local_tail;
f88395ac JH	159	static struct ref remote_refs, *remote_tail;
584c6cc9	160
f88395ac	161	static int one_local_ref(const char refname, const unsigned char sha1)
584c6cc9 LT	162	{
584c6cc9 LT	163	struct ref *ref;
f88395ac JH	164	int len = strlen(refname) + 1;
f88395ac JH	165	ref = xcalloc(1, sizeof(*ref) + len);
584c6cc9 LT	166	memcpy(ref->new_sha1, sha1, 20);
584c6cc9 LT	167	memcpy(ref->name, refname, len);
f88395ac JH	168	*local_tail = ref;
f88395ac JH	169	local_tail = &ref->next;
584c6cc9 LT	170	return 0;
	171	}
	172
f88395ac JH	173	static void get_local_heads(void)
	174	{
	175	local_tail = &local_refs;
	176	for_each_ref(one_local_ref);
	177	}
	178
	179	static int send_pack(int in, int out, int nr_refspec, char **refspec)
61221472	180	{
7f8e9828	181	struct ref *ref;
584c6cc9	182	int new_refs;
ed24928e	183	int ret = 0;
7f8e9828	184
f88395ac	185	/* No funny business with the matcher */
1a7141ff	186	remote_tail = get_remote_heads(in, &remote_refs, 0, NULL, 1);
f88395ac	187	get_local_heads();
584c6cc9	188
f88395ac JH	189	/* match them up */
	190	if (!remote_tail)
	191	remote_tail = &remote_refs;
	192	if (match_refs(local_refs, remote_refs, &remote_tail,
	193	nr_refspec, refspec, send_all))
	194	return -1;
4c353e89 DB	195
	196	if (!remote_refs) {
	197	fprintf(stderr, "No refs in common and none specified; doing nothing.\n");
	198	return 0;
	199	}
	200
584c6cc9	201	/*
f88395ac	202	* Finally, tell the other end!
584c6cc9	203	*/
f88395ac JH	204	new_refs = 0;
	205	for (ref = remote_refs; ref; ref = ref->next) {
	206	char old_hex[60], *new_hex;
	207	if (!ref->peer_ref)
7f8e9828	208	continue;
37fde874	209	if (!memcmp(ref->old_sha1, ref->peer_ref->new_sha1, 20)) {
41f93a2c LT	210	if (verbose)
41f93a2c LT	211	fprintf(stderr, "'%s': up-to-date\n", ref->name);
37fde874 JH	212	continue;
	213	}
	214
	215	/* This part determines what can overwrite what.
	216	* The rules are:
	217	*
ff27adf3 JH	218	* (0) you can always use --force or +A:B notation to
ff27adf3 JH	219	* selectively force individual ref pairs.
37fde874 JH	220	*
	221	* (1) if the old thing does not exist, it is OK.
	222	*
	223	* (2) if you do not have the old thing, you are not allowed
	224	* to overwrite it; you would not know what you are losing
	225	* otherwise.
	226	*
	227	* (3) if both new and old are commit-ish, and new is a
	228	* descendant of old, it is OK.
	229	*/
	230
ff27adf3 JH	231	if (!force_update &&
	232	!is_zero_sha1(ref->old_sha1) &&
	233	!ref->force) {
69310a34 JH	234	if (!has_sha1_file(ref->old_sha1) \|\|
69310a34 JH	235	!ref_newer(ref->peer_ref->new_sha1,
f88395ac	236	ref->old_sha1)) {
69310a34 JH	237	/* We do not have the remote ref, or
	238	* we know that the remote ref is not
	239	* an ancestor of what we are trying to
	240	* push. Either way this can be losing
	241	* commits at the remote end and likely
	242	* we were not up to date to begin with.
	243	*/
	244	error("remote '%s' is not a strict "
	245	"subset of local ref '%s'. "
	246	"maybe you are not up-to-date and "
	247	"need to pull first?",
	248	ref->name,
f88395ac	249	ref->peer_ref->name);
ed24928e	250	ret = -2;
f88395ac JH	251	continue;
f88395ac JH	252	}
e4b5c7ff	253	}
f88395ac JH	254	memcpy(ref->new_sha1, ref->peer_ref->new_sha1, 20);
	255	if (is_zero_sha1(ref->new_sha1)) {
	256	error("cannot happen anymore");
ed24928e	257	ret = -3;
584c6cc9 LT	258	continue;
584c6cc9 LT	259	}
584c6cc9	260	new_refs++;
7f8e9828 LT	261	strcpy(old_hex, sha1_to_hex(ref->old_sha1));
	262	new_hex = sha1_to_hex(ref->new_sha1);
	263	packet_write(out, "%s %s %s", old_hex, new_hex, ref->name);
f88395ac JH	264	fprintf(stderr, "updating '%s'", ref->name);
	265	if (strcmp(ref->name, ref->peer_ref->name))
	266	fprintf(stderr, " using '%s'", ref->peer_ref->name);
	267	fprintf(stderr, "\n from %s\n to %s\n", old_hex, new_hex);
61221472	268	}
f88395ac	269
f3a3214e	270	packet_flush(out);
584c6cc9	271	if (new_refs)
f88395ac	272	pack_objects(out, remote_refs);
9470657a	273	else if (ret == 0)
41f93a2c	274	fprintf(stderr, "Everything up-to-date\n");
61221472	275	close(out);
ed24928e	276	return ret;
61221472 LT	277	}
61221472 LT	278
f88395ac	279
61221472 LT	280	int main(int argc, char **argv)
	281	{
	282	int i, nr_heads = 0;
	283	char *dest = NULL;
	284	char **heads = NULL;
7f8e9828 LT	285	int fd[2], ret;
7f8e9828 LT	286	pid_t pid;
61221472	287
5a327713	288	setup_git_directory();
61221472	289	argv++;
d089391c LT	290	for (i = 1; i < argc; i++, argv++) {
d089391c LT	291	char arg = argv;
61221472 LT	292
	293	if (*arg == '-') {
	294	if (!strncmp(arg, "--exec=", 7)) {
	295	exec = arg + 7;
	296	continue;
	297	}
d089391c LT	298	if (!strcmp(arg, "--all")) {
	299	send_all = 1;
	300	continue;
	301	}
2a9c3fe8 LT	302	if (!strcmp(arg, "--force")) {
	303	force_update = 1;
	304	continue;
	305	}
41f93a2c LT	306	if (!strcmp(arg, "--verbose")) {
	307	verbose = 1;
	308	continue;
	309	}
61221472 LT	310	usage(send_pack_usage);
61221472 LT	311	}
d089391c LT	312	if (!dest) {
	313	dest = arg;
	314	continue;
	315	}
61221472	316	heads = argv;
d089391c	317	nr_heads = argc - i;
61221472 LT	318	break;
	319	}
	320	if (!dest)
	321	usage(send_pack_usage);
0bc3cdfc JH	322	if (heads && send_all)
0bc3cdfc JH	323	usage(send_pack_usage);
f7192598	324	pid = git_connect(fd, dest, exec);
7f8e9828	325	if (pid < 0)
61221472	326	return 1;
d0efc8a7	327	ret = send_pack(fd[0], fd[1], nr_heads, heads);
7f8e9828 LT	328	close(fd[0]);
7f8e9828 LT	329	close(fd[1]);
f7192598	330	finish_connect(pid);
7f8e9828	331	return ret;
61221472	332	}