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

#include "cache.h"
#include "commit.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 int ref_newer(const unsigned char *new_sha1, const unsigned char *old_sha1)
{
	struct commit *new, *old;
	struct commit_list *list;

	if (force_update)
		return 1;
	old = lookup_commit_reference(old_sha1);
	if (!old)
		return 0;
	new = lookup_commit_reference(new_sha1);
	if (!new)
		return 0;
	if (parse_commit(new) < 0)
		return 0;
	list = NULL;
	commit_list_insert(new, &list);
	while (list) {
		new = pop_most_recent_commit(&list, 1);
		if (new == old)
			return 1;
	}
	return 0;
}

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);
	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 (!is_zero_sha1(ref->old_sha1)) {
			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;
			}
			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;
			}
		}
		if (!memcmp(ref->old_sha1, ref->peer_ref->new_sha1, 20)) {
			fprintf(stderr, "'%s': up-to-date\n", 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"
584c6cc9	3	#include "refs.h"
f3a3214e	4	#include "pkt-line.h"
61221472	5
2a245013	6	static const char send_pack_usage[] =
0bc3cdfc JH	7	"git-send-pack [--all] [--exec=git-receive-pack] <remote> [<head>...]\n"
0bc3cdfc JH	8	" --all and explicit <head> specification are mutually exclusive.";
61221472	9	static const char *exec = "git-receive-pack";
d089391c	10	static int send_all = 0;
2a9c3fe8	11	static int force_update = 0;
61221472	12
584c6cc9 LT	13	static int is_zero_sha1(const unsigned char *sha1)
	14	{
	15	int i;
	16
	17	for (i = 0; i < 20; i++) {
	18	if (*sha1++)
	19	return 0;
	20	}
	21	return 1;
	22	}
	23
94fdb7aa LT	24	static void exec_pack_objects(void)
	25	{
	26	static char *args[] = {
	27	"git-pack-objects",
	28	"--stdout",
	29	NULL
	30	};
	31	execvp("git-pack-objects", args);
	32	die("git-pack-objects exec failed (%s)", strerror(errno));
	33	}
	34
	35	static void exec_rev_list(struct ref *refs)
	36	{
	37	static char *args[1000];
	38	int i = 0;
	39
	40	args[i++] = "git-rev-list"; /* 0 */
	41	args[i++] = "--objects"; /* 1 */
	42	while (refs) {
	43	char *buf = malloc(100);
	44	if (i > 900)
	45	die("git-rev-list environment overflow");
40b64d47 JH	46	if (!is_zero_sha1(refs->old_sha1) &&
40b64d47 JH	47	has_sha1_file(refs->old_sha1)) {
584c6cc9 LT	48	args[i++] = buf;
	49	snprintf(buf, 50, "^%s", sha1_to_hex(refs->old_sha1));
	50	buf += 50;
	51	}
	52	if (!is_zero_sha1(refs->new_sha1)) {
	53	args[i++] = buf;
	54	snprintf(buf, 50, "%s", sha1_to_hex(refs->new_sha1));
	55	}
94fdb7aa LT	56	refs = refs->next;
	57	}
	58	args[i] = NULL;
	59	execvp("git-rev-list", args);
	60	die("git-rev-list exec failed (%s)", strerror(errno));
	61	}
	62
	63	static void rev_list(int fd, struct ref *refs)
	64	{
	65	int pipe_fd[2];
	66	pid_t pack_objects_pid;
	67
	68	if (pipe(pipe_fd) < 0)
	69	die("rev-list setup: pipe failed");
	70	pack_objects_pid = fork();
	71	if (!pack_objects_pid) {
	72	dup2(pipe_fd[0], 0);
	73	dup2(fd, 1);
	74	close(pipe_fd[0]);
	75	close(pipe_fd[1]);
	76	close(fd);
	77	exec_pack_objects();
	78	die("pack-objects setup failed");
	79	}
	80	if (pack_objects_pid < 0)
	81	die("pack-objects fork failed");
	82	dup2(pipe_fd[1], 1);
	83	close(pipe_fd[0]);
	84	close(pipe_fd[1]);
	85	close(fd);
	86	exec_rev_list(refs);
	87	}
	88
	89	static int pack_objects(int fd, struct ref *refs)
	90	{
	91	pid_t rev_list_pid;
	92
	93	rev_list_pid = fork();
	94	if (!rev_list_pid) {
	95	rev_list(fd, refs);
	96	die("rev-list setup failed");
	97	}
	98	if (rev_list_pid < 0)
	99	die("rev-list fork failed");
	100	/*
	101	* We don't wait for the rev-list pipeline in the parent:
	102	* we end up waiting for the other end instead
	103	*/
7ec4e608	104	return 0;
94fdb7aa	105	}
e4b5c7ff	106
584c6cc9 LT	107	static int ref_newer(const unsigned char new_sha1, const unsigned char old_sha1)
584c6cc9 LT	108	{
2a9c3fe8 LT	109	struct commit new, old;
	110	struct commit_list *list;
	111
	112	if (force_update)
	113	return 1;
	114	old = lookup_commit_reference(old_sha1);
	115	if (!old)
584c6cc9	116	return 0;
2a9c3fe8 LT	117	new = lookup_commit_reference(new_sha1);
	118	if (!new)
	119	return 0;
	120	if (parse_commit(new) < 0)
	121	return 0;
	122	list = NULL;
	123	commit_list_insert(new, &list);
bdf25142 LT	124	while (list) {
bdf25142 LT	125	new = pop_most_recent_commit(&list, 1);
2a9c3fe8 LT	126	if (new == old)
	127	return 1;
	128	}
	129	return 0;
584c6cc9 LT	130	}
584c6cc9 LT	131
f88395ac JH	132	static struct ref local_refs, *local_tail;
f88395ac JH	133	static struct ref remote_refs, *remote_tail;
584c6cc9	134
f88395ac	135	static int one_local_ref(const char refname, const unsigned char sha1)
584c6cc9 LT	136	{
584c6cc9 LT	137	struct ref *ref;
f88395ac JH	138	int len = strlen(refname) + 1;
f88395ac JH	139	ref = xcalloc(1, sizeof(*ref) + len);
584c6cc9 LT	140	memcpy(ref->new_sha1, sha1, 20);
584c6cc9 LT	141	memcpy(ref->name, refname, len);
f88395ac JH	142	*local_tail = ref;
f88395ac JH	143	local_tail = &ref->next;
584c6cc9 LT	144	return 0;
	145	}
	146
f88395ac JH	147	static void get_local_heads(void)
	148	{
	149	local_tail = &local_refs;
	150	for_each_ref(one_local_ref);
	151	}
	152
	153	static int send_pack(int in, int out, int nr_refspec, char **refspec)
61221472	154	{
7f8e9828	155	struct ref *ref;
584c6cc9	156	int new_refs;
7f8e9828	157
f88395ac JH	158	/* No funny business with the matcher */
	159	remote_tail = get_remote_heads(in, &remote_refs, 0, NULL);
	160	get_local_heads();
584c6cc9	161
f88395ac JH	162	/* match them up */
	163	if (!remote_tail)
	164	remote_tail = &remote_refs;
	165	if (match_refs(local_refs, remote_refs, &remote_tail,
	166	nr_refspec, refspec, send_all))
	167	return -1;
584c6cc9	168	/*
f88395ac	169	* Finally, tell the other end!
584c6cc9	170	*/
f88395ac JH	171	new_refs = 0;
	172	for (ref = remote_refs; ref; ref = ref->next) {
	173	char old_hex[60], *new_hex;
	174	if (!ref->peer_ref)
7f8e9828	175	continue;
f88395ac JH	176	if (!is_zero_sha1(ref->old_sha1)) {
	177	if (!has_sha1_file(ref->old_sha1)) {
	178	error("remote '%s' object %s does not "
	179	"exist on local",
	180	ref->name, sha1_to_hex(ref->old_sha1));
	181	continue;
	182	}
	183	if (!ref_newer(ref->peer_ref->new_sha1,
	184	ref->old_sha1)) {
	185	error("remote ref '%s' is not a strict "
	186	"subset of local ref '%s'.", ref->name,
	187	ref->peer_ref->name);
	188	continue;
	189	}
e4b5c7ff	190	}
f88395ac JH	191	if (!memcmp(ref->old_sha1, ref->peer_ref->new_sha1, 20)) {
f88395ac JH	192	fprintf(stderr, "'%s': up-to-date\n", ref->name);
40b64d47 JH	193	continue;
40b64d47 JH	194	}
f88395ac JH	195	memcpy(ref->new_sha1, ref->peer_ref->new_sha1, 20);
	196	if (is_zero_sha1(ref->new_sha1)) {
	197	error("cannot happen anymore");
584c6cc9 LT	198	continue;
584c6cc9 LT	199	}
584c6cc9	200	new_refs++;
7f8e9828 LT	201	strcpy(old_hex, sha1_to_hex(ref->old_sha1));
	202	new_hex = sha1_to_hex(ref->new_sha1);
	203	packet_write(out, "%s %s %s", old_hex, new_hex, ref->name);
f88395ac JH	204	fprintf(stderr, "updating '%s'", ref->name);
	205	if (strcmp(ref->name, ref->peer_ref->name))
	206	fprintf(stderr, " using '%s'", ref->peer_ref->name);
	207	fprintf(stderr, "\n from %s\n to %s\n", old_hex, new_hex);
61221472	208	}
f88395ac	209
f3a3214e	210	packet_flush(out);
584c6cc9	211	if (new_refs)
f88395ac	212	pack_objects(out, remote_refs);
61221472 LT	213	close(out);
	214	return 0;
	215	}
	216
f88395ac	217
61221472 LT	218	int main(int argc, char **argv)
	219	{
	220	int i, nr_heads = 0;
	221	char *dest = NULL;
	222	char **heads = NULL;
7f8e9828 LT	223	int fd[2], ret;
7f8e9828 LT	224	pid_t pid;
61221472 LT	225
61221472 LT	226	argv++;
d089391c LT	227	for (i = 1; i < argc; i++, argv++) {
d089391c LT	228	char arg = argv;
61221472 LT	229
	230	if (*arg == '-') {
	231	if (!strncmp(arg, "--exec=", 7)) {
	232	exec = arg + 7;
	233	continue;
	234	}
d089391c LT	235	if (!strcmp(arg, "--all")) {
	236	send_all = 1;
	237	continue;
	238	}
2a9c3fe8 LT	239	if (!strcmp(arg, "--force")) {
	240	force_update = 1;
	241	continue;
	242	}
61221472 LT	243	usage(send_pack_usage);
61221472 LT	244	}
d089391c LT	245	if (!dest) {
	246	dest = arg;
	247	continue;
	248	}
61221472	249	heads = argv;
d089391c	250	nr_heads = argc - i;
61221472 LT	251	break;
	252	}
	253	if (!dest)
	254	usage(send_pack_usage);
0bc3cdfc JH	255	if (heads && send_all)
0bc3cdfc JH	256	usage(send_pack_usage);
f7192598	257	pid = git_connect(fd, dest, exec);
7f8e9828	258	if (pid < 0)
61221472	259	return 1;
d0efc8a7	260	ret = send_pack(fd[0], fd[1], nr_heads, heads);
7f8e9828 LT	261	close(fd[0]);
7f8e9828 LT	262	close(fd[1]);
f7192598	263	finish_connect(pid);
7f8e9828	264	return ret;
61221472	265	}