[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 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));
	if (!o || o->type != commit_type)
		return 0;
	old = (struct commit *) o;

	o = deref_tag(parse_object(new_sha1));
	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;

	/* 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;
	/*
	 * 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)) {
			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)) {
				error("remote '%s' object %s does not "
				      "exist on local",
				      ref->name, sha1_to_hex(ref->old_sha1));
				continue;
			}

			/* We assume that local is fsck-clean.  Otherwise
			 * you _could_ have an old tag which points at
			 * something you do not have, which may or may not
			 * be a commit.
			 */
			if (!ref_newer(ref->peer_ref->new_sha1,
				       ref->old_sha1)) {
				error("remote ref '%s' is not a strict "
				      "subset of local ref '%s'.", ref->name,
				      ref->peer_ref->name);
				continue;
			}
		}
		memcpy(ref->new_sha1, ref->peer_ref->new_sha1, 20);
		if (is_zero_sha1(ref->new_sha1)) {
			error("cannot happen anymore");
			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);
	close(out);
	return 0;
}


int main(int argc, char **argv)
{
	int i, nr_heads = 0;
	char *dest = NULL;
	char **heads = NULL;
	int fd[2], ret;
	pid_t pid;

	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;
			}
			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";
d089391c	11	static int send_all = 0;
2a9c3fe8	12	static int force_update = 0;
61221472	13
584c6cc9 LT	14	static int is_zero_sha1(const unsigned char *sha1)
	15	{
	16	int i;
	17
	18	for (i = 0; i < 20; i++) {
	19	if (*sha1++)
	20	return 0;
	21	}
	22	return 1;
	23	}
	24
94fdb7aa LT	25	static void exec_pack_objects(void)
	26	{
	27	static char *args[] = {
	28	"git-pack-objects",
	29	"--stdout",
	30	NULL
	31	};
	32	execvp("git-pack-objects", args);
	33	die("git-pack-objects exec failed (%s)", strerror(errno));
	34	}
	35
	36	static void exec_rev_list(struct ref *refs)
	37	{
	38	static char *args[1000];
	39	int i = 0;
	40
	41	args[i++] = "git-rev-list"; /* 0 */
	42	args[i++] = "--objects"; /* 1 */
	43	while (refs) {
	44	char *buf = malloc(100);
	45	if (i > 900)
	46	die("git-rev-list environment overflow");
40b64d47 JH	47	if (!is_zero_sha1(refs->old_sha1) &&
40b64d47 JH	48	has_sha1_file(refs->old_sha1)) {
584c6cc9 LT	49	args[i++] = buf;
	50	snprintf(buf, 50, "^%s", sha1_to_hex(refs->old_sha1));
	51	buf += 50;
	52	}
	53	if (!is_zero_sha1(refs->new_sha1)) {
	54	args[i++] = buf;
	55	snprintf(buf, 50, "%s", sha1_to_hex(refs->new_sha1));
	56	}
94fdb7aa LT	57	refs = refs->next;
	58	}
	59	args[i] = NULL;
	60	execvp("git-rev-list", args);
	61	die("git-rev-list exec failed (%s)", strerror(errno));
	62	}
	63
	64	static void rev_list(int fd, struct ref *refs)
	65	{
	66	int pipe_fd[2];
	67	pid_t pack_objects_pid;
	68
	69	if (pipe(pipe_fd) < 0)
	70	die("rev-list setup: pipe failed");
	71	pack_objects_pid = fork();
	72	if (!pack_objects_pid) {
	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");
	83	dup2(pipe_fd[1], 1);
	84	close(pipe_fd[0]);
	85	close(pipe_fd[1]);
	86	close(fd);
	87	exec_rev_list(refs);
	88	}
	89
	90	static int pack_objects(int fd, struct ref *refs)
	91	{
	92	pid_t rev_list_pid;
	93
	94	rev_list_pid = fork();
	95	if (!rev_list_pid) {
	96	rev_list(fd, refs);
	97	die("rev-list setup failed");
	98	}
	99	if (rev_list_pid < 0)
	100	die("rev-list fork failed");
	101	/*
	102	* We don't wait for the rev-list pipeline in the parent:
	103	* we end up waiting for the other end instead
	104	*/
7ec4e608	105	return 0;
94fdb7aa	106	}
e4b5c7ff	107
51b0fca0 JH	108	static void unmark_and_free(struct commit_list *list, unsigned int mark)
	109	{
	110	while (list) {
	111	struct commit_list *temp = list;
	112	temp->item->object.flags &= ~mark;
	113	list = temp->next;
	114	free(temp);
	115	}
	116	}
	117
37fde874 JH	118	static int ref_newer(const unsigned char *new_sha1,
37fde874 JH	119	const unsigned char *old_sha1)
584c6cc9	120	{
37fde874 JH	121	struct object *o;
37fde874 JH	122	struct commit old, new;
51b0fca0 JH	123	struct commit_list list, used;
51b0fca0 JH	124	int found = 0;
2a9c3fe8	125
37fde874 JH	126	/* Both new and old must be commit-ish and new is descendant of
	127	* old. Otherwise we require --force.
	128	*/
	129	o = deref_tag(parse_object(old_sha1));
	130	if (!o \|\| o->type != commit_type)
584c6cc9	131	return 0;
37fde874 JH	132	old = (struct commit *) o;
	133
	134	o = deref_tag(parse_object(new_sha1));
	135	if (!o \|\| o->type != commit_type)
2a9c3fe8	136	return 0;
37fde874 JH	137	new = (struct commit *) o;
37fde874 JH	138
2a9c3fe8 LT	139	if (parse_commit(new) < 0)
2a9c3fe8 LT	140	return 0;
51b0fca0 JH	141
51b0fca0 JH	142	used = list = NULL;
2a9c3fe8	143	commit_list_insert(new, &list);
bdf25142 LT	144	while (list) {
bdf25142 LT	145	new = pop_most_recent_commit(&list, 1);
51b0fca0 JH	146	commit_list_insert(new, &used);
	147	if (new == old) {
	148	found = 1;
	149	break;
	150	}
2a9c3fe8	151	}
51b0fca0 JH	152	unmark_and_free(list, 1);
	153	unmark_and_free(used, 1);
	154	return found;
584c6cc9 LT	155	}
584c6cc9 LT	156
f88395ac JH	157	static struct ref local_refs, *local_tail;
f88395ac JH	158	static struct ref remote_refs, *remote_tail;
584c6cc9	159
f88395ac	160	static int one_local_ref(const char refname, const unsigned char sha1)
584c6cc9 LT	161	{
584c6cc9 LT	162	struct ref *ref;
f88395ac JH	163	int len = strlen(refname) + 1;
f88395ac JH	164	ref = xcalloc(1, sizeof(*ref) + len);
584c6cc9 LT	165	memcpy(ref->new_sha1, sha1, 20);
584c6cc9 LT	166	memcpy(ref->name, refname, len);
f88395ac JH	167	*local_tail = ref;
f88395ac JH	168	local_tail = &ref->next;
584c6cc9 LT	169	return 0;
	170	}
	171
f88395ac JH	172	static void get_local_heads(void)
	173	{
	174	local_tail = &local_refs;
	175	for_each_ref(one_local_ref);
	176	}
	177
	178	static int send_pack(int in, int out, int nr_refspec, char **refspec)
61221472	179	{
7f8e9828	180	struct ref *ref;
584c6cc9	181	int new_refs;
7f8e9828	182
f88395ac	183	/* No funny business with the matcher */
1a7141ff	184	remote_tail = get_remote_heads(in, &remote_refs, 0, NULL, 1);
f88395ac	185	get_local_heads();
584c6cc9	186
f88395ac JH	187	/* match them up */
	188	if (!remote_tail)
	189	remote_tail = &remote_refs;
	190	if (match_refs(local_refs, remote_refs, &remote_tail,
	191	nr_refspec, refspec, send_all))
	192	return -1;
584c6cc9	193	/*
f88395ac	194	* Finally, tell the other end!
584c6cc9	195	*/
f88395ac JH	196	new_refs = 0;
	197	for (ref = remote_refs; ref; ref = ref->next) {
	198	char old_hex[60], *new_hex;
	199	if (!ref->peer_ref)
7f8e9828	200	continue;
37fde874 JH	201	if (!memcmp(ref->old_sha1, ref->peer_ref->new_sha1, 20)) {
	202	fprintf(stderr, "'%s': up-to-date\n", ref->name);
	203	continue;
	204	}
	205
	206	/* This part determines what can overwrite what.
	207	* The rules are:
	208	*
ff27adf3 JH	209	* (0) you can always use --force or +A:B notation to
ff27adf3 JH	210	* selectively force individual ref pairs.
37fde874 JH	211	*
	212	* (1) if the old thing does not exist, it is OK.
	213	*
	214	* (2) if you do not have the old thing, you are not allowed
	215	* to overwrite it; you would not know what you are losing
	216	* otherwise.
	217	*
	218	* (3) if both new and old are commit-ish, and new is a
	219	* descendant of old, it is OK.
	220	*/
	221
ff27adf3 JH	222	if (!force_update &&
	223	!is_zero_sha1(ref->old_sha1) &&
	224	!ref->force) {
f88395ac JH	225	if (!has_sha1_file(ref->old_sha1)) {
	226	error("remote '%s' object %s does not "
	227	"exist on local",
	228	ref->name, sha1_to_hex(ref->old_sha1));
	229	continue;
	230	}
ff27adf3	231
37fde874	232	/* We assume that local is fsck-clean. Otherwise
ff27adf3 JH	233	* you _could_ have an old tag which points at
ff27adf3 JH	234	* something you do not have, which may or may not
37fde874 JH	235	* be a commit.
37fde874 JH	236	*/
f88395ac JH	237	if (!ref_newer(ref->peer_ref->new_sha1,
	238	ref->old_sha1)) {
	239	error("remote ref '%s' is not a strict "
	240	"subset of local ref '%s'.", ref->name,
	241	ref->peer_ref->name);
	242	continue;
	243	}
e4b5c7ff	244	}
f88395ac JH	245	memcpy(ref->new_sha1, ref->peer_ref->new_sha1, 20);
	246	if (is_zero_sha1(ref->new_sha1)) {
	247	error("cannot happen anymore");
584c6cc9 LT	248	continue;
584c6cc9 LT	249	}
584c6cc9	250	new_refs++;
7f8e9828 LT	251	strcpy(old_hex, sha1_to_hex(ref->old_sha1));
	252	new_hex = sha1_to_hex(ref->new_sha1);
	253	packet_write(out, "%s %s %s", old_hex, new_hex, ref->name);
f88395ac JH	254	fprintf(stderr, "updating '%s'", ref->name);
	255	if (strcmp(ref->name, ref->peer_ref->name))
	256	fprintf(stderr, " using '%s'", ref->peer_ref->name);
	257	fprintf(stderr, "\n from %s\n to %s\n", old_hex, new_hex);
61221472	258	}
f88395ac	259
f3a3214e	260	packet_flush(out);
584c6cc9	261	if (new_refs)
f88395ac	262	pack_objects(out, remote_refs);
61221472 LT	263	close(out);
	264	return 0;
	265	}
	266
f88395ac	267
61221472 LT	268	int main(int argc, char **argv)
	269	{
	270	int i, nr_heads = 0;
	271	char *dest = NULL;
	272	char **heads = NULL;
7f8e9828 LT	273	int fd[2], ret;
7f8e9828 LT	274	pid_t pid;
61221472 LT	275
61221472 LT	276	argv++;
d089391c LT	277	for (i = 1; i < argc; i++, argv++) {
d089391c LT	278	char arg = argv;
61221472 LT	279
	280	if (*arg == '-') {
	281	if (!strncmp(arg, "--exec=", 7)) {
	282	exec = arg + 7;
	283	continue;
	284	}
d089391c LT	285	if (!strcmp(arg, "--all")) {
	286	send_all = 1;
	287	continue;
	288	}
2a9c3fe8 LT	289	if (!strcmp(arg, "--force")) {
	290	force_update = 1;
	291	continue;
	292	}
61221472 LT	293	usage(send_pack_usage);
61221472 LT	294	}
d089391c LT	295	if (!dest) {
	296	dest = arg;
	297	continue;
	298	}
61221472	299	heads = argv;
d089391c	300	nr_heads = argc - i;
61221472 LT	301	break;
	302	}
	303	if (!dest)
	304	usage(send_pack_usage);
0bc3cdfc JH	305	if (heads && send_all)
0bc3cdfc JH	306	usage(send_pack_usage);
f7192598	307	pid = git_connect(fd, dest, exec);
7f8e9828	308	if (pid < 0)
61221472	309	return 1;
d0efc8a7	310	ret = send_pack(fd[0], fd[1], nr_heads, heads);
7f8e9828 LT	311	close(fd[0]);
7f8e9828 LT	312	close(fd[1]);
f7192598	313	finish_connect(pid);
7f8e9828	314	return ret;
61221472	315	}