1 #include "cache.h"
2 #include "commit.h"
3 #include "tag.h"
4 #include "refs.h"
5 #include "pkt-line.h"
6 #include "run-command.h"
7 #include "remote.h"
8 #include "send-pack.h"
10 static const char send_pack_usage[] =
11 "git-send-pack [--all | --mirror] [--dry-run] [--force] [--receive-pack=<git-receive-pack>] [--verbose] [--thin] [<host>:]<directory> [<ref>...]\n"
12 " --all and explicit <ref> specification are mutually exclusive.";
14 static struct send_pack_args args = {
15 /* .receivepack = */ "git-receive-pack",
16 };
18 /*
19 * Make a pack stream and spit it out into file descriptor fd
20 */
21 static int pack_objects(int fd, struct ref *refs)
22 {
23 /*
24 * The child becomes pack-objects --revs; we feed
25 * the revision parameters to it via its stdin and
26 * let its stdout go back to the other end.
27 */
28 const char *argv[] = {
29 "pack-objects",
30 "--all-progress",
31 "--revs",
32 "--stdout",
33 NULL,
34 NULL,
35 };
36 struct child_process po;
38 if (args.use_thin_pack)
39 argv[4] = "--thin";
40 memset(&po, 0, sizeof(po));
41 po.argv = argv;
42 po.in = -1;
43 po.out = fd;
44 po.git_cmd = 1;
45 if (start_command(&po))
46 die("git-pack-objects failed (%s)", strerror(errno));
48 /*
49 * We feed the pack-objects we just spawned with revision
50 * parameters by writing to the pipe.
51 */
52 while (refs) {
53 char buf[42];
55 if (!is_null_sha1(refs->old_sha1) &&
56 has_sha1_file(refs->old_sha1)) {
57 memcpy(buf + 1, sha1_to_hex(refs->old_sha1), 40);
58 buf[0] = '^';
59 buf[41] = '\n';
60 if (!write_or_whine(po.in, buf, 42,
61 "send-pack: send refs"))
62 break;
63 }
64 if (!is_null_sha1(refs->new_sha1)) {
65 memcpy(buf, sha1_to_hex(refs->new_sha1), 40);
66 buf[40] = '\n';
67 if (!write_or_whine(po.in, buf, 41,
68 "send-pack: send refs"))
69 break;
70 }
71 refs = refs->next;
72 }
74 if (finish_command(&po))
75 return error("pack-objects died with strange error");
76 return 0;
77 }
79 static void unmark_and_free(struct commit_list *list, unsigned int mark)
80 {
81 while (list) {
82 struct commit_list *temp = list;
83 temp->item->object.flags &= ~mark;
84 list = temp->next;
85 free(temp);
86 }
87 }
89 static int ref_newer(const unsigned char *new_sha1,
90 const unsigned char *old_sha1)
91 {
92 struct object *o;
93 struct commit *old, *new;
94 struct commit_list *list, *used;
95 int found = 0;
97 /* Both new and old must be commit-ish and new is descendant of
98 * old. Otherwise we require --force.
99 */
100 o = deref_tag(parse_object(old_sha1), NULL, 0);
101 if (!o || o->type != OBJ_COMMIT)
102 return 0;
103 old = (struct commit *) o;
105 o = deref_tag(parse_object(new_sha1), NULL, 0);
106 if (!o || o->type != OBJ_COMMIT)
107 return 0;
108 new = (struct commit *) o;
110 if (parse_commit(new) < 0)
111 return 0;
113 used = list = NULL;
114 commit_list_insert(new, &list);
115 while (list) {
116 new = pop_most_recent_commit(&list, 1);
117 commit_list_insert(new, &used);
118 if (new == old) {
119 found = 1;
120 break;
121 }
122 }
123 unmark_and_free(list, 1);
124 unmark_and_free(used, 1);
125 return found;
126 }
128 static struct ref *local_refs, **local_tail;
129 static struct ref *remote_refs, **remote_tail;
131 static int one_local_ref(const char *refname, const unsigned char *sha1, int flag, void *cb_data)
132 {
133 struct ref *ref;
134 int len = strlen(refname) + 1;
135 ref = xcalloc(1, sizeof(*ref) + len);
136 hashcpy(ref->new_sha1, sha1);
137 memcpy(ref->name, refname, len);
138 *local_tail = ref;
139 local_tail = &ref->next;
140 return 0;
141 }
143 static void get_local_heads(void)
144 {
145 local_tail = &local_refs;
146 for_each_ref(one_local_ref, NULL);
147 }
149 static int receive_status(int in, struct ref *refs)
150 {
151 struct ref *hint;
152 char line[1000];
153 int ret = 0;
154 int len = packet_read_line(in, line, sizeof(line));
155 if (len < 10 || memcmp(line, "unpack ", 7))
156 return error("did not receive remote status");
157 if (memcmp(line, "unpack ok\n", 10)) {
158 char *p = line + strlen(line) - 1;
159 if (*p == '\n')
160 *p = '\0';
161 error("unpack failed: %s", line + 7);
162 ret = -1;
163 }
164 hint = NULL;
165 while (1) {
166 char *refname;
167 char *msg;
168 len = packet_read_line(in, line, sizeof(line));
169 if (!len)
170 break;
171 if (len < 3 ||
172 (memcmp(line, "ok ", 3) && memcmp(line, "ng ", 3))) {
173 fprintf(stderr, "protocol error: %s\n", line);
174 ret = -1;
175 break;
176 }
178 line[strlen(line)-1] = '\0';
179 refname = line + 3;
180 msg = strchr(refname, ' ');
181 if (msg)
182 *msg++ = '\0';
184 /* first try searching at our hint, falling back to all refs */
185 if (hint)
186 hint = find_ref_by_name(hint, refname);
187 if (!hint)
188 hint = find_ref_by_name(refs, refname);
189 if (!hint) {
190 warning("remote reported status on unknown ref: %s",
191 refname);
192 continue;
193 }
194 if (hint->status != REF_STATUS_EXPECTING_REPORT) {
195 warning("remote reported status on unexpected ref: %s",
196 refname);
197 continue;
198 }
200 if (line[0] == 'o' && line[1] == 'k')
201 hint->status = REF_STATUS_OK;
202 else {
203 hint->status = REF_STATUS_REMOTE_REJECT;
204 ret = -1;
205 }
206 if (msg)
207 hint->remote_status = xstrdup(msg);
208 /* start our next search from the next ref */
209 hint = hint->next;
210 }
211 return ret;
212 }
214 static void update_tracking_ref(struct remote *remote, struct ref *ref)
215 {
216 struct refspec rs;
218 if (ref->status != REF_STATUS_OK)
219 return;
221 rs.src = ref->name;
222 rs.dst = NULL;
224 if (!remote_find_tracking(remote, &rs)) {
225 if (args.verbose)
226 fprintf(stderr, "updating local tracking ref '%s'\n", rs.dst);
227 if (ref->deletion) {
228 if (delete_ref(rs.dst, NULL))
229 error("Failed to delete");
230 } else
231 update_ref("update by push", rs.dst,
232 ref->new_sha1, NULL, 0, 0);
233 free(rs.dst);
234 }
235 }
237 static const char *prettify_ref(const struct ref *ref)
238 {
239 const char *name = ref->name;
240 return name + (
241 !prefixcmp(name, "refs/heads/") ? 11 :
242 !prefixcmp(name, "refs/tags/") ? 10 :
243 !prefixcmp(name, "refs/remotes/") ? 13 :
244 0);
245 }
247 #define SUMMARY_WIDTH (2 * DEFAULT_ABBREV + 3)
249 static void print_ref_status(char flag, const char *summary, struct ref *to, struct ref *from, const char *msg)
250 {
251 fprintf(stderr, " %c %-*s ", flag, SUMMARY_WIDTH, summary);
252 if (from)
253 fprintf(stderr, "%s -> %s", prettify_ref(from), prettify_ref(to));
254 else
255 fputs(prettify_ref(to), stderr);
256 if (msg) {
257 fputs(" (", stderr);
258 fputs(msg, stderr);
259 fputc(')', stderr);
260 }
261 fputc('\n', stderr);
262 }
264 static const char *status_abbrev(unsigned char sha1[20])
265 {
266 const char *abbrev;
267 abbrev = find_unique_abbrev(sha1, DEFAULT_ABBREV);
268 return abbrev ? abbrev : sha1_to_hex(sha1);
269 }
271 static void print_ok_ref_status(struct ref *ref)
272 {
273 if (ref->deletion)
274 print_ref_status('-', "[deleted]", ref, NULL, NULL);
275 else if (is_null_sha1(ref->old_sha1))
276 print_ref_status('*',
277 (!prefixcmp(ref->name, "refs/tags/") ? "[new tag]" :
278 "[new branch]"),
279 ref, ref->peer_ref, NULL);
280 else {
281 char quickref[84];
282 char type;
283 const char *msg;
285 strcpy(quickref, status_abbrev(ref->old_sha1));
286 if (ref->nonfastforward) {
287 strcat(quickref, "...");
288 type = '+';
289 msg = "forced update";
290 } else {
291 strcat(quickref, "..");
292 type = ' ';
293 msg = NULL;
294 }
295 strcat(quickref, status_abbrev(ref->new_sha1));
297 print_ref_status(type, quickref, ref, ref->peer_ref, msg);
298 }
299 }
301 static void print_push_status(const char *dest, struct ref *refs)
302 {
303 struct ref *ref;
304 int shown_dest = 0;
306 for (ref = refs; ref; ref = ref->next) {
307 if (!ref->status)
308 continue;
309 if (ref->status == REF_STATUS_UPTODATE && !args.verbose)
310 continue;
312 if (!shown_dest) {
313 fprintf(stderr, "To %s\n", dest);
314 shown_dest = 1;
315 }
317 switch(ref->status) {
318 case REF_STATUS_NONE:
319 print_ref_status('X', "[no match]", ref, NULL, NULL);
320 break;
321 case REF_STATUS_REJECT_NODELETE:
322 print_ref_status('!', "[rejected]", ref, NULL,
323 "remote does not support deleting refs");
324 break;
325 case REF_STATUS_UPTODATE:
326 print_ref_status('=', "[up to date]", ref,
327 ref->peer_ref, NULL);
328 break;
329 case REF_STATUS_REJECT_NONFASTFORWARD:
330 print_ref_status('!', "[rejected]", ref, ref->peer_ref,
331 "non-fast forward");
332 break;
333 case REF_STATUS_REMOTE_REJECT:
334 print_ref_status('!', "[remote rejected]", ref,
335 ref->deletion ? NULL : ref->peer_ref,
336 ref->remote_status);
337 break;
338 case REF_STATUS_EXPECTING_REPORT:
339 print_ref_status('!', "[remote failure]", ref,
340 ref->deletion ? NULL : ref->peer_ref,
341 "remote failed to report status");
342 break;
343 case REF_STATUS_OK:
344 print_ok_ref_status(ref);
345 break;
346 }
347 }
348 }
350 static int refs_pushed(struct ref *ref)
351 {
352 for (; ref; ref = ref->next) {
353 switch(ref->status) {
354 case REF_STATUS_NONE:
355 case REF_STATUS_UPTODATE:
356 break;
357 default:
358 return 1;
359 }
360 }
361 return 0;
362 }
364 static int do_send_pack(int in, int out, struct remote *remote, const char *dest, int nr_refspec, const char **refspec)
365 {
366 struct ref *ref;
367 int new_refs;
368 int ask_for_status_report = 0;
369 int allow_deleting_refs = 0;
370 int expect_status_report = 0;
371 int flags = MATCH_REFS_NONE;
372 int ret;
374 if (args.send_all)
375 flags |= MATCH_REFS_ALL;
376 if (args.send_mirror)
377 flags |= MATCH_REFS_MIRROR;
379 /* No funny business with the matcher */
380 remote_tail = get_remote_heads(in, &remote_refs, 0, NULL, REF_NORMAL);
381 get_local_heads();
383 /* Does the other end support the reporting? */
384 if (server_supports("report-status"))
385 ask_for_status_report = 1;
386 if (server_supports("delete-refs"))
387 allow_deleting_refs = 1;
389 /* match them up */
390 if (!remote_tail)
391 remote_tail = &remote_refs;
392 if (match_refs(local_refs, remote_refs, &remote_tail,
393 nr_refspec, refspec, flags))
394 return -1;
396 if (!remote_refs) {
397 fprintf(stderr, "No refs in common and none specified; doing nothing.\n"
398 "Perhaps you should specify a branch such as 'master'.\n");
399 return 0;
400 }
402 /*
403 * Finally, tell the other end!
404 */
405 new_refs = 0;
406 for (ref = remote_refs; ref; ref = ref->next) {
407 const unsigned char *new_sha1;
409 if (!ref->peer_ref) {
410 if (!args.send_mirror)
411 continue;
412 new_sha1 = null_sha1;
413 }
414 else
415 new_sha1 = ref->peer_ref->new_sha1;
418 ref->deletion = is_null_sha1(new_sha1);
419 if (ref->deletion && !allow_deleting_refs) {
420 ref->status = REF_STATUS_REJECT_NODELETE;
421 continue;
422 }
423 if (!ref->deletion &&
424 !hashcmp(ref->old_sha1, new_sha1)) {
425 ref->status = REF_STATUS_UPTODATE;
426 continue;
427 }
429 /* This part determines what can overwrite what.
430 * The rules are:
431 *
432 * (0) you can always use --force or +A:B notation to
433 * selectively force individual ref pairs.
434 *
435 * (1) if the old thing does not exist, it is OK.
436 *
437 * (2) if you do not have the old thing, you are not allowed
438 * to overwrite it; you would not know what you are losing
439 * otherwise.
440 *
441 * (3) if both new and old are commit-ish, and new is a
442 * descendant of old, it is OK.
443 *
444 * (4) regardless of all of the above, removing :B is
445 * always allowed.
446 */
448 ref->nonfastforward =
449 !ref->deletion &&
450 !is_null_sha1(ref->old_sha1) &&
451 (!has_sha1_file(ref->old_sha1)
452 || !ref_newer(new_sha1, ref->old_sha1));
454 if (ref->nonfastforward && !ref->force && !args.force_update) {
455 ref->status = REF_STATUS_REJECT_NONFASTFORWARD;
456 continue;
457 }
459 hashcpy(ref->new_sha1, new_sha1);
460 if (!ref->deletion)
461 new_refs++;
463 if (!args.dry_run) {
464 char *old_hex = sha1_to_hex(ref->old_sha1);
465 char *new_hex = sha1_to_hex(ref->new_sha1);
467 if (ask_for_status_report) {
468 packet_write(out, "%s %s %s%c%s",
469 old_hex, new_hex, ref->name, 0,
470 "report-status");
471 ask_for_status_report = 0;
472 expect_status_report = 1;
473 }
474 else
475 packet_write(out, "%s %s %s",
476 old_hex, new_hex, ref->name);
477 }
478 ref->status = expect_status_report ?
479 REF_STATUS_EXPECTING_REPORT :
480 REF_STATUS_OK;
481 }
483 packet_flush(out);
484 if (new_refs && !args.dry_run) {
485 if (pack_objects(out, remote_refs) < 0) {
486 close(out);
487 return -1;
488 }
489 }
490 close(out);
492 if (expect_status_report)
493 ret = receive_status(in, remote_refs);
494 else
495 ret = 0;
497 print_push_status(dest, remote_refs);
499 if (!args.dry_run && remote) {
500 for (ref = remote_refs; ref; ref = ref->next)
501 update_tracking_ref(remote, ref);
502 }
504 if (!refs_pushed(remote_refs))
505 fprintf(stderr, "Everything up-to-date\n");
506 if (ret < 0)
507 return ret;
508 for (ref = remote_refs; ref; ref = ref->next) {
509 switch (ref->status) {
510 case REF_STATUS_NONE:
511 case REF_STATUS_UPTODATE:
512 case REF_STATUS_OK:
513 break;
514 default:
515 return -1;
516 }
517 }
518 return 0;
519 }
521 static void verify_remote_names(int nr_heads, const char **heads)
522 {
523 int i;
525 for (i = 0; i < nr_heads; i++) {
526 const char *remote = strchr(heads[i], ':');
528 remote = remote ? (remote + 1) : heads[i];
529 switch (check_ref_format(remote)) {
530 case 0: /* ok */
531 case -2: /* ok but a single level -- that is fine for
532 * a match pattern.
533 */
534 case -3: /* ok but ends with a pattern-match character */
535 continue;
536 }
537 die("remote part of refspec is not a valid name in %s",
538 heads[i]);
539 }
540 }
542 int cmd_send_pack(int argc, const char **argv, const char *prefix)
543 {
544 int i, nr_heads = 0;
545 const char **heads = NULL;
546 const char *remote_name = NULL;
547 struct remote *remote = NULL;
548 const char *dest = NULL;
550 argv++;
551 for (i = 1; i < argc; i++, argv++) {
552 const char *arg = *argv;
554 if (*arg == '-') {
555 if (!prefixcmp(arg, "--receive-pack=")) {
556 args.receivepack = arg + 15;
557 continue;
558 }
559 if (!prefixcmp(arg, "--exec=")) {
560 args.receivepack = arg + 7;
561 continue;
562 }
563 if (!prefixcmp(arg, "--remote=")) {
564 remote_name = arg + 9;
565 continue;
566 }
567 if (!strcmp(arg, "--all")) {
568 args.send_all = 1;
569 continue;
570 }
571 if (!strcmp(arg, "--dry-run")) {
572 args.dry_run = 1;
573 continue;
574 }
575 if (!strcmp(arg, "--mirror")) {
576 args.send_mirror = 1;
577 continue;
578 }
579 if (!strcmp(arg, "--force")) {
580 args.force_update = 1;
581 continue;
582 }
583 if (!strcmp(arg, "--verbose")) {
584 args.verbose = 1;
585 continue;
586 }
587 if (!strcmp(arg, "--thin")) {
588 args.use_thin_pack = 1;
589 continue;
590 }
591 usage(send_pack_usage);
592 }
593 if (!dest) {
594 dest = arg;
595 continue;
596 }
597 heads = (const char **) argv;
598 nr_heads = argc - i;
599 break;
600 }
601 if (!dest)
602 usage(send_pack_usage);
603 /*
604 * --all and --mirror are incompatible; neither makes sense
605 * with any refspecs.
606 */
607 if ((heads && (args.send_all || args.send_mirror)) ||
608 (args.send_all && args.send_mirror))
609 usage(send_pack_usage);
611 if (remote_name) {
612 remote = remote_get(remote_name);
613 if (!remote_has_url(remote, dest)) {
614 die("Destination %s is not a uri for %s",
615 dest, remote_name);
616 }
617 }
619 return send_pack(&args, dest, remote, nr_heads, heads);
620 }
622 int send_pack(struct send_pack_args *my_args,
623 const char *dest, struct remote *remote,
624 int nr_heads, const char **heads)
625 {
626 int fd[2], ret;
627 struct child_process *conn;
629 memcpy(&args, my_args, sizeof(args));
631 verify_remote_names(nr_heads, heads);
633 conn = git_connect(fd, dest, args.receivepack, args.verbose ? CONNECT_VERBOSE : 0);
634 ret = do_send_pack(fd[0], fd[1], remote, dest, nr_heads, heads);
635 close(fd[0]);
636 close(fd[1]);
637 ret |= finish_connect(conn);
638 return !!ret;
639 }