93c05229cb2c451365b6c18be26af600d704b1f8
[git/git.git] / upload-pack.c
1 #include "cache.h"
2 #include "refs.h"
3 #include "pkt-line.h"
4 #include "sideband.h"
5 #include "tag.h"
6 #include "object.h"
7 #include "commit.h"
8 #include "exec_cmd.h"
9 #include "diff.h"
10 #include "revision.h"
11 #include "list-objects.h"
12 #include "run-command.h"
13 #include "connect.h"
14 #include "sigchain.h"
15 #include "version.h"
16 #include "string-list.h"
17
18 static const char upload_pack_usage[] = "git upload-pack [--strict] [--timeout=<n>] <dir>";
19
20 /* Remember to update object flag allocation in object.h */
21 #define THEY_HAVE (1u << 11)
22 #define OUR_REF (1u << 12)
23 #define WANTED (1u << 13)
24 #define COMMON_KNOWN (1u << 14)
25 #define REACHABLE (1u << 15)
26
27 #define SHALLOW (1u << 16)
28 #define NOT_SHALLOW (1u << 17)
29 #define CLIENT_SHALLOW (1u << 18)
30 #define HIDDEN_REF (1u << 19)
31
32 static unsigned long oldest_have;
33
34 static int multi_ack;
35 static int no_done;
36 static int use_thin_pack, use_ofs_delta, use_include_tag;
37 static int no_progress, daemon_mode;
38 /* Allow specifying sha1 if it is a ref tip. */
39 #define ALLOW_TIP_SHA1 01
40 /* Allow request of a sha1 if it is reachable from a ref (possibly hidden ref). */
41 #define ALLOW_REACHABLE_SHA1 02
42 static unsigned int allow_unadvertised_object_request;
43 static int shallow_nr;
44 static struct object_array have_obj;
45 static struct object_array want_obj;
46 static struct object_array extra_edge_obj;
47 static unsigned int timeout;
48 static int keepalive = 5;
49 /* 0 for no sideband,
50 * otherwise maximum packet size (up to 65520 bytes).
51 */
52 static int use_sideband;
53 static int advertise_refs;
54 static int stateless_rpc;
55
56 static void reset_timeout(void)
57 {
58 alarm(timeout);
59 }
60
61 static ssize_t send_client_data(int fd, const char *data, ssize_t sz)
62 {
63 if (use_sideband)
64 return send_sideband(1, fd, data, sz, use_sideband);
65 if (fd == 3)
66 /* emergency quit */
67 fd = 2;
68 if (fd == 2) {
69 /* XXX: are we happy to lose stuff here? */
70 xwrite(fd, data, sz);
71 return sz;
72 }
73 write_or_die(fd, data, sz);
74 return sz;
75 }
76
77 static int write_one_shallow(const struct commit_graft *graft, void *cb_data)
78 {
79 FILE *fp = cb_data;
80 if (graft->nr_parent == -1)
81 fprintf(fp, "--shallow %s\n", oid_to_hex(&graft->oid));
82 return 0;
83 }
84
85 static void create_pack_file(void)
86 {
87 struct child_process pack_objects = CHILD_PROCESS_INIT;
88 char data[8193], progress[128];
89 char abort_msg[] = "aborting due to possible repository "
90 "corruption on the remote side.";
91 int buffered = -1;
92 ssize_t sz;
93 const char *argv[13];
94 int i, arg = 0;
95 FILE *pipe_fd;
96
97 if (shallow_nr) {
98 argv[arg++] = "--shallow-file";
99 argv[arg++] = "";
100 }
101 argv[arg++] = "pack-objects";
102 argv[arg++] = "--revs";
103 if (use_thin_pack)
104 argv[arg++] = "--thin";
105
106 argv[arg++] = "--stdout";
107 if (shallow_nr)
108 argv[arg++] = "--shallow";
109 if (!no_progress)
110 argv[arg++] = "--progress";
111 if (use_ofs_delta)
112 argv[arg++] = "--delta-base-offset";
113 if (use_include_tag)
114 argv[arg++] = "--include-tag";
115 argv[arg++] = NULL;
116
117 pack_objects.in = -1;
118 pack_objects.out = -1;
119 pack_objects.err = -1;
120 pack_objects.git_cmd = 1;
121 pack_objects.argv = argv;
122
123 if (start_command(&pack_objects))
124 die("git upload-pack: unable to fork git-pack-objects");
125
126 pipe_fd = xfdopen(pack_objects.in, "w");
127
128 if (shallow_nr)
129 for_each_commit_graft(write_one_shallow, pipe_fd);
130
131 for (i = 0; i < want_obj.nr; i++)
132 fprintf(pipe_fd, "%s\n",
133 oid_to_hex(&want_obj.objects[i].item->oid));
134 fprintf(pipe_fd, "--not\n");
135 for (i = 0; i < have_obj.nr; i++)
136 fprintf(pipe_fd, "%s\n",
137 oid_to_hex(&have_obj.objects[i].item->oid));
138 for (i = 0; i < extra_edge_obj.nr; i++)
139 fprintf(pipe_fd, "%s\n",
140 oid_to_hex(&extra_edge_obj.objects[i].item->oid));
141 fprintf(pipe_fd, "\n");
142 fflush(pipe_fd);
143 fclose(pipe_fd);
144
145 /* We read from pack_objects.err to capture stderr output for
146 * progress bar, and pack_objects.out to capture the pack data.
147 */
148
149 while (1) {
150 struct pollfd pfd[2];
151 int pe, pu, pollsize;
152 int ret;
153
154 reset_timeout();
155
156 pollsize = 0;
157 pe = pu = -1;
158
159 if (0 <= pack_objects.out) {
160 pfd[pollsize].fd = pack_objects.out;
161 pfd[pollsize].events = POLLIN;
162 pu = pollsize;
163 pollsize++;
164 }
165 if (0 <= pack_objects.err) {
166 pfd[pollsize].fd = pack_objects.err;
167 pfd[pollsize].events = POLLIN;
168 pe = pollsize;
169 pollsize++;
170 }
171
172 if (!pollsize)
173 break;
174
175 ret = poll(pfd, pollsize,
176 keepalive < 0 ? -1 : 1000 * keepalive);
177
178 if (ret < 0) {
179 if (errno != EINTR) {
180 error("poll failed, resuming: %s",
181 strerror(errno));
182 sleep(1);
183 }
184 continue;
185 }
186 if (0 <= pe && (pfd[pe].revents & (POLLIN|POLLHUP))) {
187 /* Status ready; we ship that in the side-band
188 * or dump to the standard error.
189 */
190 sz = xread(pack_objects.err, progress,
191 sizeof(progress));
192 if (0 < sz)
193 send_client_data(2, progress, sz);
194 else if (sz == 0) {
195 close(pack_objects.err);
196 pack_objects.err = -1;
197 }
198 else
199 goto fail;
200 /* give priority to status messages */
201 continue;
202 }
203 if (0 <= pu && (pfd[pu].revents & (POLLIN|POLLHUP))) {
204 /* Data ready; we keep the last byte to ourselves
205 * in case we detect broken rev-list, so that we
206 * can leave the stream corrupted. This is
207 * unfortunate -- unpack-objects would happily
208 * accept a valid packdata with trailing garbage,
209 * so appending garbage after we pass all the
210 * pack data is not good enough to signal
211 * breakage to downstream.
212 */
213 char *cp = data;
214 ssize_t outsz = 0;
215 if (0 <= buffered) {
216 *cp++ = buffered;
217 outsz++;
218 }
219 sz = xread(pack_objects.out, cp,
220 sizeof(data) - outsz);
221 if (0 < sz)
222 ;
223 else if (sz == 0) {
224 close(pack_objects.out);
225 pack_objects.out = -1;
226 }
227 else
228 goto fail;
229 sz += outsz;
230 if (1 < sz) {
231 buffered = data[sz-1] & 0xFF;
232 sz--;
233 }
234 else
235 buffered = -1;
236 sz = send_client_data(1, data, sz);
237 if (sz < 0)
238 goto fail;
239 }
240
241 /*
242 * We hit the keepalive timeout without saying anything; send
243 * an empty message on the data sideband just to let the other
244 * side know we're still working on it, but don't have any data
245 * yet.
246 *
247 * If we don't have a sideband channel, there's no room in the
248 * protocol to say anything, so those clients are just out of
249 * luck.
250 */
251 if (!ret && use_sideband) {
252 static const char buf[] = "0005\1";
253 write_or_die(1, buf, 5);
254 }
255 }
256
257 if (finish_command(&pack_objects)) {
258 error("git upload-pack: git-pack-objects died with error.");
259 goto fail;
260 }
261
262 /* flush the data */
263 if (0 <= buffered) {
264 data[0] = buffered;
265 sz = send_client_data(1, data, 1);
266 if (sz < 0)
267 goto fail;
268 fprintf(stderr, "flushed.\n");
269 }
270 if (use_sideband)
271 packet_flush(1);
272 return;
273
274 fail:
275 send_client_data(3, abort_msg, sizeof(abort_msg));
276 die("git upload-pack: %s", abort_msg);
277 }
278
279 static int got_sha1(const char *hex, unsigned char *sha1)
280 {
281 struct object *o;
282 int we_knew_they_have = 0;
283
284 if (get_sha1_hex(hex, sha1))
285 die("git upload-pack: expected SHA1 object, got '%s'", hex);
286 if (!has_sha1_file(sha1))
287 return -1;
288
289 o = parse_object(sha1);
290 if (!o)
291 die("oops (%s)", sha1_to_hex(sha1));
292 if (o->type == OBJ_COMMIT) {
293 struct commit_list *parents;
294 struct commit *commit = (struct commit *)o;
295 if (o->flags & THEY_HAVE)
296 we_knew_they_have = 1;
297 else
298 o->flags |= THEY_HAVE;
299 if (!oldest_have || (commit->date < oldest_have))
300 oldest_have = commit->date;
301 for (parents = commit->parents;
302 parents;
303 parents = parents->next)
304 parents->item->object.flags |= THEY_HAVE;
305 }
306 if (!we_knew_they_have) {
307 add_object_array(o, NULL, &have_obj);
308 return 1;
309 }
310 return 0;
311 }
312
313 static int reachable(struct commit *want)
314 {
315 struct commit_list *work = NULL;
316
317 commit_list_insert_by_date(want, &work);
318 while (work) {
319 struct commit_list *list;
320 struct commit *commit = pop_commit(&work);
321
322 if (commit->object.flags & THEY_HAVE) {
323 want->object.flags |= COMMON_KNOWN;
324 break;
325 }
326 if (!commit->object.parsed)
327 parse_object(commit->object.oid.hash);
328 if (commit->object.flags & REACHABLE)
329 continue;
330 commit->object.flags |= REACHABLE;
331 if (commit->date < oldest_have)
332 continue;
333 for (list = commit->parents; list; list = list->next) {
334 struct commit *parent = list->item;
335 if (!(parent->object.flags & REACHABLE))
336 commit_list_insert_by_date(parent, &work);
337 }
338 }
339 want->object.flags |= REACHABLE;
340 clear_commit_marks(want, REACHABLE);
341 free_commit_list(work);
342 return (want->object.flags & COMMON_KNOWN);
343 }
344
345 static int ok_to_give_up(void)
346 {
347 int i;
348
349 if (!have_obj.nr)
350 return 0;
351
352 for (i = 0; i < want_obj.nr; i++) {
353 struct object *want = want_obj.objects[i].item;
354
355 if (want->flags & COMMON_KNOWN)
356 continue;
357 want = deref_tag(want, "a want line", 0);
358 if (!want || want->type != OBJ_COMMIT) {
359 /* no way to tell if this is reachable by
360 * looking at the ancestry chain alone, so
361 * leave a note to ourselves not to worry about
362 * this object anymore.
363 */
364 want_obj.objects[i].item->flags |= COMMON_KNOWN;
365 continue;
366 }
367 if (!reachable((struct commit *)want))
368 return 0;
369 }
370 return 1;
371 }
372
373 static int get_common_commits(void)
374 {
375 unsigned char sha1[20];
376 char last_hex[41];
377 int got_common = 0;
378 int got_other = 0;
379 int sent_ready = 0;
380
381 save_commit_buffer = 0;
382
383 for (;;) {
384 char *line = packet_read_line(0, NULL);
385 const char *arg;
386
387 reset_timeout();
388
389 if (!line) {
390 if (multi_ack == 2 && got_common
391 && !got_other && ok_to_give_up()) {
392 sent_ready = 1;
393 packet_write(1, "ACK %s ready\n", last_hex);
394 }
395 if (have_obj.nr == 0 || multi_ack)
396 packet_write(1, "NAK\n");
397
398 if (no_done && sent_ready) {
399 packet_write(1, "ACK %s\n", last_hex);
400 return 0;
401 }
402 if (stateless_rpc)
403 exit(0);
404 got_common = 0;
405 got_other = 0;
406 continue;
407 }
408 if (skip_prefix(line, "have ", &arg)) {
409 switch (got_sha1(arg, sha1)) {
410 case -1: /* they have what we do not */
411 got_other = 1;
412 if (multi_ack && ok_to_give_up()) {
413 const char *hex = sha1_to_hex(sha1);
414 if (multi_ack == 2) {
415 sent_ready = 1;
416 packet_write(1, "ACK %s ready\n", hex);
417 } else
418 packet_write(1, "ACK %s continue\n", hex);
419 }
420 break;
421 default:
422 got_common = 1;
423 memcpy(last_hex, sha1_to_hex(sha1), 41);
424 if (multi_ack == 2)
425 packet_write(1, "ACK %s common\n", last_hex);
426 else if (multi_ack)
427 packet_write(1, "ACK %s continue\n", last_hex);
428 else if (have_obj.nr == 1)
429 packet_write(1, "ACK %s\n", last_hex);
430 break;
431 }
432 continue;
433 }
434 if (!strcmp(line, "done")) {
435 if (have_obj.nr > 0) {
436 if (multi_ack)
437 packet_write(1, "ACK %s\n", last_hex);
438 return 0;
439 }
440 packet_write(1, "NAK\n");
441 return -1;
442 }
443 die("git upload-pack: expected SHA1 list, got '%s'", line);
444 }
445 }
446
447 static int is_our_ref(struct object *o)
448 {
449 int allow_hidden_ref = (allow_unadvertised_object_request &
450 (ALLOW_TIP_SHA1 | ALLOW_REACHABLE_SHA1));
451 return o->flags & ((allow_hidden_ref ? HIDDEN_REF : 0) | OUR_REF);
452 }
453
454 static int has_unreachable(struct object_array *src)
455 {
456 static const char *argv[] = {
457 "rev-list", "--stdin", NULL,
458 };
459 static struct child_process cmd = CHILD_PROCESS_INIT;
460 struct object *o;
461 char namebuf[42]; /* ^ + SHA-1 + LF */
462 int i;
463
464 cmd.argv = argv;
465 cmd.git_cmd = 1;
466 cmd.no_stderr = 1;
467 cmd.in = -1;
468 cmd.out = -1;
469
470 /*
471 * If the next rev-list --stdin encounters an unknown commit,
472 * it terminates, which will cause SIGPIPE in the write loop
473 * below.
474 */
475 sigchain_push(SIGPIPE, SIG_IGN);
476
477 if (start_command(&cmd))
478 goto error;
479
480 namebuf[0] = '^';
481 namebuf[41] = '\n';
482 for (i = get_max_object_index(); 0 < i; ) {
483 o = get_indexed_object(--i);
484 if (!o)
485 continue;
486 if (!is_our_ref(o))
487 continue;
488 memcpy(namebuf + 1, oid_to_hex(&o->oid), GIT_SHA1_HEXSZ);
489 if (write_in_full(cmd.in, namebuf, 42) < 0)
490 goto error;
491 }
492 namebuf[40] = '\n';
493 for (i = 0; i < src->nr; i++) {
494 o = src->objects[i].item;
495 if (is_our_ref(o))
496 continue;
497 memcpy(namebuf, oid_to_hex(&o->oid), GIT_SHA1_HEXSZ);
498 if (write_in_full(cmd.in, namebuf, 41) < 0)
499 goto error;
500 }
501 close(cmd.in);
502 cmd.in = -1;
503
504 /*
505 * The commits out of the rev-list are not ancestors of
506 * our ref.
507 */
508 i = read_in_full(cmd.out, namebuf, 1);
509 if (i)
510 goto error;
511 close(cmd.out);
512 cmd.out = -1;
513
514 /*
515 * rev-list may have died by encountering a bad commit
516 * in the history, in which case we do want to bail out
517 * even when it showed no commit.
518 */
519 if (finish_command(&cmd))
520 goto error;
521
522 sigchain_pop(SIGPIPE);
523
524 /* All the non-tip ones are ancestors of what we advertised */
525 return 0;
526
527 error:
528 sigchain_pop(SIGPIPE);
529
530 if (cmd.in >= 0)
531 close(cmd.in);
532 if (cmd.out >= 0)
533 close(cmd.out);
534 return 1;
535 }
536
537 static void check_non_tip(void)
538 {
539 int i;
540
541 /*
542 * In the normal in-process case without
543 * uploadpack.allowReachableSHA1InWant,
544 * non-tip requests can never happen.
545 */
546 if (!stateless_rpc && !(allow_unadvertised_object_request & ALLOW_REACHABLE_SHA1))
547 goto error;
548 if (!has_unreachable(&want_obj))
549 /* All the non-tip ones are ancestors of what we advertised */
550 return;
551
552 error:
553 /* Pick one of them (we know there at least is one) */
554 for (i = 0; i < want_obj.nr; i++) {
555 struct object *o = want_obj.objects[i].item;
556 if (!is_our_ref(o))
557 die("git upload-pack: not our ref %s",
558 oid_to_hex(&o->oid));
559 }
560 }
561
562 static void send_shallow(struct commit_list *result)
563 {
564 while (result) {
565 struct object *object = &result->item->object;
566 if (!(object->flags & (CLIENT_SHALLOW|NOT_SHALLOW))) {
567 packet_write(1, "shallow %s",
568 oid_to_hex(&object->oid));
569 register_shallow(object->oid.hash);
570 shallow_nr++;
571 }
572 result = result->next;
573 }
574 }
575
576 static void send_unshallow(const struct object_array *shallows)
577 {
578 int i;
579
580 for (i = 0; i < shallows->nr; i++) {
581 struct object *object = shallows->objects[i].item;
582 if (object->flags & NOT_SHALLOW) {
583 struct commit_list *parents;
584 packet_write(1, "unshallow %s",
585 oid_to_hex(&object->oid));
586 object->flags &= ~CLIENT_SHALLOW;
587 /*
588 * We want to _register_ "object" as shallow, but we
589 * also need to traverse object's parents to deepen a
590 * shallow clone. Unregister it for now so we can
591 * parse and add the parents to the want list, then
592 * re-register it.
593 */
594 unregister_shallow(object->oid.hash);
595 object->parsed = 0;
596 parse_commit_or_die((struct commit *)object);
597 parents = ((struct commit *)object)->parents;
598 while (parents) {
599 add_object_array(&parents->item->object,
600 NULL, &want_obj);
601 parents = parents->next;
602 }
603 add_object_array(object, NULL, &extra_edge_obj);
604 }
605 /* make sure commit traversal conforms to client */
606 register_shallow(object->oid.hash);
607 }
608 }
609
610 static void deepen(int depth, const struct object_array *shallows)
611 {
612 if (depth == INFINITE_DEPTH && !is_repository_shallow()) {
613 int i;
614
615 for (i = 0; i < shallows->nr; i++) {
616 struct object *object = shallows->objects[i].item;
617 object->flags |= NOT_SHALLOW;
618 }
619 } else {
620 struct commit_list *result;
621
622 result = get_shallow_commits(&want_obj, depth,
623 SHALLOW, NOT_SHALLOW);
624 send_shallow(result);
625 free_commit_list(result);
626 }
627
628 send_unshallow(shallows);
629 packet_flush(1);
630 }
631
632 static void receive_needs(void)
633 {
634 struct object_array shallows = OBJECT_ARRAY_INIT;
635 int depth = 0;
636 int has_non_tip = 0;
637
638 shallow_nr = 0;
639 for (;;) {
640 struct object *o;
641 const char *features;
642 unsigned char sha1_buf[20];
643 char *line = packet_read_line(0, NULL);
644 const char *arg;
645
646 reset_timeout();
647 if (!line)
648 break;
649
650 if (skip_prefix(line, "shallow ", &arg)) {
651 unsigned char sha1[20];
652 struct object *object;
653 if (get_sha1_hex(arg, sha1))
654 die("invalid shallow line: %s", line);
655 object = parse_object(sha1);
656 if (!object)
657 continue;
658 if (object->type != OBJ_COMMIT)
659 die("invalid shallow object %s", sha1_to_hex(sha1));
660 if (!(object->flags & CLIENT_SHALLOW)) {
661 object->flags |= CLIENT_SHALLOW;
662 add_object_array(object, NULL, &shallows);
663 }
664 continue;
665 }
666 if (skip_prefix(line, "deepen ", &arg)) {
667 char *end = NULL;
668 depth = strtol(arg, &end, 0);
669 if (!end || *end || depth <= 0)
670 die("Invalid deepen: %s", line);
671 continue;
672 }
673 if (!skip_prefix(line, "want ", &arg) ||
674 get_sha1_hex(arg, sha1_buf))
675 die("git upload-pack: protocol error, "
676 "expected to get sha, not '%s'", line);
677
678 features = arg + 40;
679
680 if (parse_feature_request(features, "multi_ack_detailed"))
681 multi_ack = 2;
682 else if (parse_feature_request(features, "multi_ack"))
683 multi_ack = 1;
684 if (parse_feature_request(features, "no-done"))
685 no_done = 1;
686 if (parse_feature_request(features, "thin-pack"))
687 use_thin_pack = 1;
688 if (parse_feature_request(features, "ofs-delta"))
689 use_ofs_delta = 1;
690 if (parse_feature_request(features, "side-band-64k"))
691 use_sideband = LARGE_PACKET_MAX;
692 else if (parse_feature_request(features, "side-band"))
693 use_sideband = DEFAULT_PACKET_MAX;
694 if (parse_feature_request(features, "no-progress"))
695 no_progress = 1;
696 if (parse_feature_request(features, "include-tag"))
697 use_include_tag = 1;
698
699 o = parse_object(sha1_buf);
700 if (!o)
701 die("git upload-pack: not our ref %s",
702 sha1_to_hex(sha1_buf));
703 if (!(o->flags & WANTED)) {
704 o->flags |= WANTED;
705 if (!is_our_ref(o))
706 has_non_tip = 1;
707 add_object_array(o, NULL, &want_obj);
708 }
709 }
710
711 /*
712 * We have sent all our refs already, and the other end
713 * should have chosen out of them. When we are operating
714 * in the stateless RPC mode, however, their choice may
715 * have been based on the set of older refs advertised
716 * by another process that handled the initial request.
717 */
718 if (has_non_tip)
719 check_non_tip();
720
721 if (!use_sideband && daemon_mode)
722 no_progress = 1;
723
724 if (depth == 0 && shallows.nr == 0)
725 return;
726 if (depth > 0)
727 deepen(depth, &shallows);
728 else
729 if (shallows.nr > 0) {
730 int i;
731 for (i = 0; i < shallows.nr; i++)
732 register_shallow(shallows.objects[i].item->oid.hash);
733 }
734
735 shallow_nr += shallows.nr;
736 free(shallows.objects);
737 }
738
739 /* return non-zero if the ref is hidden, otherwise 0 */
740 static int mark_our_ref(const char *refname, const char *refname_full,
741 const struct object_id *oid)
742 {
743 struct object *o = lookup_unknown_object(oid->hash);
744
745 if (ref_is_hidden(refname, refname_full)) {
746 o->flags |= HIDDEN_REF;
747 return 1;
748 }
749 o->flags |= OUR_REF;
750 return 0;
751 }
752
753 static int check_ref(const char *refname_full, const struct object_id *oid,
754 int flag, void *cb_data)
755 {
756 const char *refname = strip_namespace(refname_full);
757
758 mark_our_ref(refname, refname_full, oid);
759 return 0;
760 }
761
762 static void format_symref_info(struct strbuf *buf, struct string_list *symref)
763 {
764 struct string_list_item *item;
765
766 if (!symref->nr)
767 return;
768 for_each_string_list_item(item, symref)
769 strbuf_addf(buf, " symref=%s:%s", item->string, (char *)item->util);
770 }
771
772 static int send_ref(const char *refname, const struct object_id *oid,
773 int flag, void *cb_data)
774 {
775 static const char *capabilities = "multi_ack thin-pack side-band"
776 " side-band-64k ofs-delta shallow no-progress"
777 " include-tag multi_ack_detailed";
778 const char *refname_nons = strip_namespace(refname);
779 struct object_id peeled;
780
781 if (mark_our_ref(refname_nons, refname, oid))
782 return 0;
783
784 if (capabilities) {
785 struct strbuf symref_info = STRBUF_INIT;
786
787 format_symref_info(&symref_info, cb_data);
788 packet_write(1, "%s %s%c%s%s%s%s%s agent=%s\n",
789 oid_to_hex(oid), refname_nons,
790 0, capabilities,
791 (allow_unadvertised_object_request & ALLOW_TIP_SHA1) ?
792 " allow-tip-sha1-in-want" : "",
793 (allow_unadvertised_object_request & ALLOW_REACHABLE_SHA1) ?
794 " allow-reachable-sha1-in-want" : "",
795 stateless_rpc ? " no-done" : "",
796 symref_info.buf,
797 git_user_agent_sanitized());
798 strbuf_release(&symref_info);
799 } else {
800 packet_write(1, "%s %s\n", oid_to_hex(oid), refname_nons);
801 }
802 capabilities = NULL;
803 if (!peel_ref(refname, peeled.hash))
804 packet_write(1, "%s %s^{}\n", oid_to_hex(&peeled), refname_nons);
805 return 0;
806 }
807
808 static int find_symref(const char *refname, const struct object_id *oid,
809 int flag, void *cb_data)
810 {
811 const char *symref_target;
812 struct string_list_item *item;
813 struct object_id unused;
814
815 if ((flag & REF_ISSYMREF) == 0)
816 return 0;
817 symref_target = resolve_ref_unsafe(refname, 0, unused.hash, &flag);
818 if (!symref_target || (flag & REF_ISSYMREF) == 0)
819 die("'%s' is a symref but it is not?", refname);
820 item = string_list_append(cb_data, refname);
821 item->util = xstrdup(symref_target);
822 return 0;
823 }
824
825 static void upload_pack(void)
826 {
827 struct string_list symref = STRING_LIST_INIT_DUP;
828
829 head_ref_namespaced(find_symref, &symref);
830
831 if (advertise_refs || !stateless_rpc) {
832 reset_timeout();
833 head_ref_namespaced(send_ref, &symref);
834 for_each_namespaced_ref(send_ref, &symref);
835 advertise_shallow_grafts(1);
836 packet_flush(1);
837 } else {
838 head_ref_namespaced(check_ref, NULL);
839 for_each_namespaced_ref(check_ref, NULL);
840 }
841 string_list_clear(&symref, 1);
842 if (advertise_refs)
843 return;
844
845 receive_needs();
846 if (want_obj.nr) {
847 get_common_commits();
848 create_pack_file();
849 }
850 }
851
852 static int upload_pack_config(const char *var, const char *value, void *unused)
853 {
854 if (!strcmp("uploadpack.allowtipsha1inwant", var)) {
855 if (git_config_bool(var, value))
856 allow_unadvertised_object_request |= ALLOW_TIP_SHA1;
857 else
858 allow_unadvertised_object_request &= ~ALLOW_TIP_SHA1;
859 } else if (!strcmp("uploadpack.allowreachablesha1inwant", var)) {
860 if (git_config_bool(var, value))
861 allow_unadvertised_object_request |= ALLOW_REACHABLE_SHA1;
862 else
863 allow_unadvertised_object_request &= ~ALLOW_REACHABLE_SHA1;
864 } else if (!strcmp("uploadpack.keepalive", var)) {
865 keepalive = git_config_int(var, value);
866 if (!keepalive)
867 keepalive = -1;
868 }
869 return parse_hide_refs_config(var, value, "uploadpack");
870 }
871
872 int main(int argc, char **argv)
873 {
874 char *dir;
875 int i;
876 int strict = 0;
877
878 git_setup_gettext();
879
880 packet_trace_identity("upload-pack");
881 git_extract_argv0_path(argv[0]);
882 check_replace_refs = 0;
883
884 for (i = 1; i < argc; i++) {
885 const char *arg = argv[i];
886
887 if (arg[0] != '-')
888 break;
889 if (!strcmp(arg, "--advertise-refs")) {
890 advertise_refs = 1;
891 continue;
892 }
893 if (!strcmp(arg, "--stateless-rpc")) {
894 stateless_rpc = 1;
895 continue;
896 }
897 if (!strcmp(arg, "--strict")) {
898 strict = 1;
899 continue;
900 }
901 if (skip_prefix(arg, "--timeout=", &arg)) {
902 timeout = atoi(arg);
903 daemon_mode = 1;
904 continue;
905 }
906 if (!strcmp(arg, "--")) {
907 i++;
908 break;
909 }
910 }
911
912 if (i != argc-1)
913 usage(upload_pack_usage);
914
915 setup_path();
916
917 dir = argv[i];
918
919 if (!enter_repo(dir, strict))
920 die("'%s' does not appear to be a git repository", dir);
921
922 git_config(upload_pack_config, NULL);
923 upload_pack();
924 return 0;
925 }