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