Add a missing fork() error check.
[git/git.git] / send-pack.c
1 #include "cache.h"
2 #include "commit.h"
3 #include "tag.h"
4 #include "refs.h"
5 #include "pkt-line.h"
6 #include "exec_cmd.h"
7
8 static const char send_pack_usage[] =
9 "git-send-pack [--all] [--force] [--receive-pack=<git-receive-pack>] [--verbose] [--thin] [<host>:]<directory> [<ref>...]\n"
10 " --all and explicit <ref> specification are mutually exclusive.";
11 static const char *receivepack = "git-receive-pack";
12 static int verbose;
13 static int send_all;
14 static int force_update;
15 static int use_thin_pack;
16
17 /*
18 * Make a pack stream and spit it out into file descriptor fd
19 */
20 static int pack_objects(int fd, struct ref *refs)
21 {
22 int pipe_fd[2];
23 pid_t pid;
24
25 if (pipe(pipe_fd) < 0)
26 return error("send-pack: pipe failed");
27 pid = fork();
28 if (pid < 0)
29 return error("send-pack: unable to fork git-pack-objects");
30 if (!pid) {
31 /*
32 * The child becomes pack-objects --revs; we feed
33 * the revision parameters to it via its stdin and
34 * let its stdout go back to the other end.
35 */
36 static const char *args[] = {
37 "pack-objects",
38 "--all-progress",
39 "--revs",
40 "--stdout",
41 NULL,
42 NULL,
43 };
44 if (use_thin_pack)
45 args[4] = "--thin";
46 dup2(pipe_fd[0], 0);
47 dup2(fd, 1);
48 close(pipe_fd[0]);
49 close(pipe_fd[1]);
50 close(fd);
51 execv_git_cmd(args);
52 die("git-pack-objects exec failed (%s)", strerror(errno));
53 }
54
55 /*
56 * We feed the pack-objects we just spawned with revision
57 * parameters by writing to the pipe.
58 */
59 close(pipe_fd[0]);
60 close(fd);
61
62 while (refs) {
63 char buf[42];
64
65 if (!is_null_sha1(refs->old_sha1) &&
66 has_sha1_file(refs->old_sha1)) {
67 memcpy(buf + 1, sha1_to_hex(refs->old_sha1), 40);
68 buf[0] = '^';
69 buf[41] = '\n';
70 if (!write_or_whine(pipe_fd[1], buf, 42,
71 "send-pack: send refs"))
72 break;
73 }
74 if (!is_null_sha1(refs->new_sha1)) {
75 memcpy(buf, sha1_to_hex(refs->new_sha1), 40);
76 buf[40] = '\n';
77 if (!write_or_whine(pipe_fd[1], buf, 41,
78 "send-pack: send refs"))
79 break;
80 }
81 refs = refs->next;
82 }
83 close(pipe_fd[1]);
84
85 for (;;) {
86 int status, code;
87 pid_t waiting = waitpid(pid, &status, 0);
88
89 if (waiting < 0) {
90 if (errno == EINTR)
91 continue;
92 return error("waitpid failed (%s)", strerror(errno));
93 }
94 if ((waiting != pid) || WIFSIGNALED(status) ||
95 !WIFEXITED(status))
96 return error("pack-objects died with strange error");
97 code = WEXITSTATUS(status);
98 if (code)
99 return -code;
100 return 0;
101 }
102 }
103
104 static void unmark_and_free(struct commit_list *list, unsigned int mark)
105 {
106 while (list) {
107 struct commit_list *temp = list;
108 temp->item->object.flags &= ~mark;
109 list = temp->next;
110 free(temp);
111 }
112 }
113
114 static int ref_newer(const unsigned char *new_sha1,
115 const unsigned char *old_sha1)
116 {
117 struct object *o;
118 struct commit *old, *new;
119 struct commit_list *list, *used;
120 int found = 0;
121
122 /* Both new and old must be commit-ish and new is descendant of
123 * old. Otherwise we require --force.
124 */
125 o = deref_tag(parse_object(old_sha1), NULL, 0);
126 if (!o || o->type != OBJ_COMMIT)
127 return 0;
128 old = (struct commit *) o;
129
130 o = deref_tag(parse_object(new_sha1), NULL, 0);
131 if (!o || o->type != OBJ_COMMIT)
132 return 0;
133 new = (struct commit *) o;
134
135 if (parse_commit(new) < 0)
136 return 0;
137
138 used = list = NULL;
139 commit_list_insert(new, &list);
140 while (list) {
141 new = pop_most_recent_commit(&list, 1);
142 commit_list_insert(new, &used);
143 if (new == old) {
144 found = 1;
145 break;
146 }
147 }
148 unmark_and_free(list, 1);
149 unmark_and_free(used, 1);
150 return found;
151 }
152
153 static struct ref *local_refs, **local_tail;
154 static struct ref *remote_refs, **remote_tail;
155
156 static int one_local_ref(const char *refname, const unsigned char *sha1, int flag, void *cb_data)
157 {
158 struct ref *ref;
159 int len = strlen(refname) + 1;
160 ref = xcalloc(1, sizeof(*ref) + len);
161 hashcpy(ref->new_sha1, sha1);
162 memcpy(ref->name, refname, len);
163 *local_tail = ref;
164 local_tail = &ref->next;
165 return 0;
166 }
167
168 static void get_local_heads(void)
169 {
170 local_tail = &local_refs;
171 for_each_ref(one_local_ref, NULL);
172 }
173
174 static int receive_status(int in)
175 {
176 char line[1000];
177 int ret = 0;
178 int len = packet_read_line(in, line, sizeof(line));
179 if (len < 10 || memcmp(line, "unpack ", 7)) {
180 fprintf(stderr, "did not receive status back\n");
181 return -1;
182 }
183 if (memcmp(line, "unpack ok\n", 10)) {
184 fputs(line, stderr);
185 ret = -1;
186 }
187 while (1) {
188 len = packet_read_line(in, line, sizeof(line));
189 if (!len)
190 break;
191 if (len < 3 ||
192 (memcmp(line, "ok", 2) && memcmp(line, "ng", 2))) {
193 fprintf(stderr, "protocol error: %s\n", line);
194 ret = -1;
195 break;
196 }
197 if (!memcmp(line, "ok", 2))
198 continue;
199 fputs(line, stderr);
200 ret = -1;
201 }
202 return ret;
203 }
204
205 static int send_pack(int in, int out, int nr_refspec, char **refspec)
206 {
207 struct ref *ref;
208 int new_refs;
209 int ret = 0;
210 int ask_for_status_report = 0;
211 int allow_deleting_refs = 0;
212 int expect_status_report = 0;
213
214 /* No funny business with the matcher */
215 remote_tail = get_remote_heads(in, &remote_refs, 0, NULL, REF_NORMAL);
216 get_local_heads();
217
218 /* Does the other end support the reporting? */
219 if (server_supports("report-status"))
220 ask_for_status_report = 1;
221 if (server_supports("delete-refs"))
222 allow_deleting_refs = 1;
223
224 /* match them up */
225 if (!remote_tail)
226 remote_tail = &remote_refs;
227 if (match_refs(local_refs, remote_refs, &remote_tail,
228 nr_refspec, refspec, send_all))
229 return -1;
230
231 if (!remote_refs) {
232 fprintf(stderr, "No refs in common and none specified; doing nothing.\n");
233 return 0;
234 }
235
236 /*
237 * Finally, tell the other end!
238 */
239 new_refs = 0;
240 for (ref = remote_refs; ref; ref = ref->next) {
241 char old_hex[60], *new_hex;
242 int delete_ref;
243
244 if (!ref->peer_ref)
245 continue;
246
247 delete_ref = is_null_sha1(ref->peer_ref->new_sha1);
248 if (delete_ref && !allow_deleting_refs) {
249 error("remote does not support deleting refs");
250 ret = -2;
251 continue;
252 }
253 if (!delete_ref &&
254 !hashcmp(ref->old_sha1, ref->peer_ref->new_sha1)) {
255 if (verbose)
256 fprintf(stderr, "'%s': up-to-date\n", ref->name);
257 continue;
258 }
259
260 /* This part determines what can overwrite what.
261 * The rules are:
262 *
263 * (0) you can always use --force or +A:B notation to
264 * selectively force individual ref pairs.
265 *
266 * (1) if the old thing does not exist, it is OK.
267 *
268 * (2) if you do not have the old thing, you are not allowed
269 * to overwrite it; you would not know what you are losing
270 * otherwise.
271 *
272 * (3) if both new and old are commit-ish, and new is a
273 * descendant of old, it is OK.
274 *
275 * (4) regardless of all of the above, removing :B is
276 * always allowed.
277 */
278
279 if (!force_update &&
280 !delete_ref &&
281 !is_null_sha1(ref->old_sha1) &&
282 !ref->force) {
283 if (!has_sha1_file(ref->old_sha1) ||
284 !ref_newer(ref->peer_ref->new_sha1,
285 ref->old_sha1)) {
286 /* We do not have the remote ref, or
287 * we know that the remote ref is not
288 * an ancestor of what we are trying to
289 * push. Either way this can be losing
290 * commits at the remote end and likely
291 * we were not up to date to begin with.
292 */
293 error("remote '%s' is not a strict "
294 "subset of local ref '%s'. "
295 "maybe you are not up-to-date and "
296 "need to pull first?",
297 ref->name,
298 ref->peer_ref->name);
299 ret = -2;
300 continue;
301 }
302 }
303 hashcpy(ref->new_sha1, ref->peer_ref->new_sha1);
304 if (!delete_ref)
305 new_refs++;
306 strcpy(old_hex, sha1_to_hex(ref->old_sha1));
307 new_hex = sha1_to_hex(ref->new_sha1);
308
309 if (ask_for_status_report) {
310 packet_write(out, "%s %s %s%c%s",
311 old_hex, new_hex, ref->name, 0,
312 "report-status");
313 ask_for_status_report = 0;
314 expect_status_report = 1;
315 }
316 else
317 packet_write(out, "%s %s %s",
318 old_hex, new_hex, ref->name);
319 if (delete_ref)
320 fprintf(stderr, "deleting '%s'\n", ref->name);
321 else {
322 fprintf(stderr, "updating '%s'", ref->name);
323 if (strcmp(ref->name, ref->peer_ref->name))
324 fprintf(stderr, " using '%s'",
325 ref->peer_ref->name);
326 fprintf(stderr, "\n from %s\n to %s\n",
327 old_hex, new_hex);
328 }
329 }
330
331 packet_flush(out);
332 if (new_refs)
333 ret = pack_objects(out, remote_refs);
334 close(out);
335
336 if (expect_status_report) {
337 if (receive_status(in))
338 ret = -4;
339 }
340
341 if (!new_refs && ret == 0)
342 fprintf(stderr, "Everything up-to-date\n");
343 return ret;
344 }
345
346 static void verify_remote_names(int nr_heads, char **heads)
347 {
348 int i;
349
350 for (i = 0; i < nr_heads; i++) {
351 const char *remote = strchr(heads[i], ':');
352
353 remote = remote ? (remote + 1) : heads[i];
354 switch (check_ref_format(remote)) {
355 case 0: /* ok */
356 case -2: /* ok but a single level -- that is fine for
357 * a match pattern.
358 */
359 continue;
360 }
361 die("remote part of refspec is not a valid name in %s",
362 heads[i]);
363 }
364 }
365
366 int main(int argc, char **argv)
367 {
368 int i, nr_heads = 0;
369 char *dest = NULL;
370 char **heads = NULL;
371 int fd[2], ret;
372 pid_t pid;
373
374 setup_git_directory();
375 git_config(git_default_config);
376
377 argv++;
378 for (i = 1; i < argc; i++, argv++) {
379 char *arg = *argv;
380
381 if (*arg == '-') {
382 if (!strncmp(arg, "--receive-pack=", 15)) {
383 receivepack = arg + 15;
384 continue;
385 }
386 if (!strncmp(arg, "--exec=", 7)) {
387 receivepack = arg + 7;
388 continue;
389 }
390 if (!strcmp(arg, "--all")) {
391 send_all = 1;
392 continue;
393 }
394 if (!strcmp(arg, "--force")) {
395 force_update = 1;
396 continue;
397 }
398 if (!strcmp(arg, "--verbose")) {
399 verbose = 1;
400 continue;
401 }
402 if (!strcmp(arg, "--thin")) {
403 use_thin_pack = 1;
404 continue;
405 }
406 usage(send_pack_usage);
407 }
408 if (!dest) {
409 dest = arg;
410 continue;
411 }
412 heads = argv;
413 nr_heads = argc - i;
414 break;
415 }
416 if (!dest)
417 usage(send_pack_usage);
418 if (heads && send_all)
419 usage(send_pack_usage);
420 verify_remote_names(nr_heads, heads);
421
422 pid = git_connect(fd, dest, receivepack);
423 if (pid < 0)
424 return 1;
425 ret = send_pack(fd[0], fd[1], nr_heads, heads);
426 close(fd[0]);
427 close(fd[1]);
428 ret |= finish_connect(pid);
429 return !!ret;
430 }