7 static const char send_pack_usage[] =
8 "git-send-pack [--all] [--exec=git-receive-pack] <remote> [<head>...]\n"
9 " --all and explicit <head> specification are mutually exclusive.";
10 static const char *exec = "git-receive-pack";
11 static int verbose = 0;
12 static int send_all = 0;
13 static int force_update = 0;
15 static int is_zero_sha1(const unsigned char *sha1)
19 for (i = 0; i < 20; i++) {
26 static void exec_pack_objects(void)
28 static char *args[] = {
33 execvp("git-pack-objects", args);
34 die("git-pack-objects exec failed (%s)", strerror(errno));
37 static void exec_rev_list(struct ref *refs)
39 static char *args[1000];
42 args[i++] = "git-rev-list"; /* 0 */
43 args[i++] = "--objects"; /* 1 */
45 char *buf = malloc(100);
47 die("git-rev-list environment overflow");
48 if (!is_zero_sha1(refs->old_sha1) &&
49 has_sha1_file(refs->old_sha1)) {
51 snprintf(buf, 50, "^%s", sha1_to_hex(refs->old_sha1));
54 if (!is_zero_sha1(refs->new_sha1)) {
56 snprintf(buf, 50, "%s", sha1_to_hex(refs->new_sha1));
61 execvp("git-rev-list", args);
62 die("git-rev-list exec failed (%s)", strerror(errno));
65 static void rev_list(int fd, struct ref *refs)
68 pid_t pack_objects_pid;
70 if (pipe(pipe_fd) < 0)
71 die("rev-list setup: pipe failed");
72 pack_objects_pid = fork();
73 if (!pack_objects_pid) {
80 die("pack-objects setup failed");
82 if (pack_objects_pid < 0)
83 die("pack-objects fork failed");
91 static int pack_objects(int fd, struct ref *refs)
95 rev_list_pid = fork();
98 die("rev-list setup failed");
100 if (rev_list_pid < 0)
101 die("rev-list fork failed");
103 * We don't wait for the rev-list pipeline in the parent:
104 * we end up waiting for the other end instead
109 static void unmark_and_free(struct commit_list *list, unsigned int mark)
112 struct commit_list *temp = list;
113 temp->item->object.flags &= ~mark;
119 static int ref_newer(const unsigned char *new_sha1,
120 const unsigned char *old_sha1)
123 struct commit *old, *new;
124 struct commit_list *list, *used;
127 /* Both new and old must be commit-ish and new is descendant of
128 * old. Otherwise we require --force.
130 o = deref_tag(parse_object(old_sha1), NULL, 0);
131 if (!o || o->type != commit_type)
133 old = (struct commit *) o;
135 o = deref_tag(parse_object(new_sha1), NULL, 0);
136 if (!o || o->type != commit_type)
138 new = (struct commit *) o;
140 if (parse_commit(new) < 0)
144 commit_list_insert(new, &list);
146 new = pop_most_recent_commit(&list, 1);
147 commit_list_insert(new, &used);
153 unmark_and_free(list, 1);
154 unmark_and_free(used, 1);
158 static struct ref *local_refs, **local_tail;
159 static struct ref *remote_refs, **remote_tail;
161 static int one_local_ref(const char *refname, const unsigned char *sha1)
164 int len = strlen(refname) + 1;
165 ref = xcalloc(1, sizeof(*ref) + len);
166 memcpy(ref->new_sha1, sha1, 20);
167 memcpy(ref->name, refname, len);
169 local_tail = &ref->next;
173 static void get_local_heads(void)
175 local_tail = &local_refs;
176 for_each_ref(one_local_ref);
179 static int send_pack(int in, int out, int nr_refspec, char **refspec)
185 /* No funny business with the matcher */
186 remote_tail = get_remote_heads(in, &remote_refs, 0, NULL, 1);
191 remote_tail = &remote_refs;
192 if (match_refs(local_refs, remote_refs, &remote_tail,
193 nr_refspec, refspec, send_all))
197 fprintf(stderr, "No refs in common and none specified; doing nothing.\n");
202 * Finally, tell the other end!
205 for (ref = remote_refs; ref; ref = ref->next) {
206 char old_hex[60], *new_hex;
209 if (!memcmp(ref->old_sha1, ref->peer_ref->new_sha1, 20)) {
211 fprintf(stderr, "'%s': up-to-date\n", ref->name);
215 /* This part determines what can overwrite what.
218 * (0) you can always use --force or +A:B notation to
219 * selectively force individual ref pairs.
221 * (1) if the old thing does not exist, it is OK.
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
227 * (3) if both new and old are commit-ish, and new is a
228 * descendant of old, it is OK.
232 !is_zero_sha1(ref->old_sha1) &&
234 if (!has_sha1_file(ref->old_sha1) ||
235 !ref_newer(ref->peer_ref->new_sha1,
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.
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?",
249 ref->peer_ref->name);
254 memcpy(ref->new_sha1, ref->peer_ref->new_sha1, 20);
255 if (is_zero_sha1(ref->new_sha1)) {
256 error("cannot happen anymore");
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);
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);
272 pack_objects(out, remote_refs);
274 fprintf(stderr, "Everything up-to-date\n");
280 int main(int argc, char **argv)
288 setup_git_directory();
290 for (i = 1; i < argc; i++, argv++) {
294 if (!strncmp(arg, "--exec=", 7)) {
298 if (!strcmp(arg, "--all")) {
302 if (!strcmp(arg, "--force")) {
306 if (!strcmp(arg, "--verbose")) {
310 usage(send_pack_usage);
321 usage(send_pack_usage);
322 if (heads && send_all)
323 usage(send_pack_usage);
324 pid = git_connect(fd, dest, exec);
327 ret = send_pack(fd[0], fd[1], nr_heads, heads);