Merge branch 'nd/remote-plural-ours-plus-theirs'
[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("poll failed, resuming: %s",
178                                       strerror(errno));
179                                 sleep(1);
180                         }
181                         continue;
182                 }
183                 if (0 <= pe && (pfd[pe].revents & (POLLIN|POLLHUP))) {
184                         /* Status ready; we ship that in the side-band
185                          * or dump to the standard error.
186                          */
187                         sz = xread(pack_objects.err, progress,
188                                   sizeof(progress));
189                         if (0 < sz)
190                                 send_client_data(2, progress, sz);
191                         else if (sz == 0) {
192                                 close(pack_objects.err);
193                                 pack_objects.err = -1;
194                         }
195                         else
196                                 goto fail;
197                         /* give priority to status messages */
198                         continue;
199                 }
200                 if (0 <= pu && (pfd[pu].revents & (POLLIN|POLLHUP))) {
201                         /* Data ready; we keep the last byte to ourselves
202                          * in case we detect broken rev-list, so that we
203                          * can leave the stream corrupted.  This is
204                          * unfortunate -- unpack-objects would happily
205                          * accept a valid packdata with trailing garbage,
206                          * so appending garbage after we pass all the
207                          * pack data is not good enough to signal
208                          * breakage to downstream.
209                          */
210                         char *cp = data;
211                         ssize_t outsz = 0;
212                         if (0 <= buffered) {
213                                 *cp++ = buffered;
214                                 outsz++;
215                         }
216                         sz = xread(pack_objects.out, cp,
217                                   sizeof(data) - outsz);
218                         if (0 < sz)
219                                 ;
220                         else if (sz == 0) {
221                                 close(pack_objects.out);
222                                 pack_objects.out = -1;
223                         }
224                         else
225                                 goto fail;
226                         sz += outsz;
227                         if (1 < sz) {
228                                 buffered = data[sz-1] & 0xFF;
229                                 sz--;
230                         }
231                         else
232                                 buffered = -1;
233                         sz = send_client_data(1, data, sz);
234                         if (sz < 0)
235                                 goto fail;
236                 }
237
238                 /*
239                  * We hit the keepalive timeout without saying anything; send
240                  * an empty message on the data sideband just to let the other
241                  * side know we're still working on it, but don't have any data
242                  * yet.
243                  *
244                  * If we don't have a sideband channel, there's no room in the
245                  * protocol to say anything, so those clients are just out of
246                  * luck.
247                  */
248                 if (!ret && use_sideband) {
249                         static const char buf[] = "0005\1";
250                         write_or_die(1, buf, 5);
251                 }
252         }
253
254         if (finish_command(&pack_objects)) {
255                 error("git upload-pack: git-pack-objects died with error.");
256                 goto fail;
257         }
258
259         /* flush the data */
260         if (0 <= buffered) {
261                 data[0] = buffered;
262                 sz = send_client_data(1, data, 1);
263                 if (sz < 0)
264                         goto fail;
265                 fprintf(stderr, "flushed.\n");
266         }
267         if (use_sideband)
268                 packet_flush(1);
269         return;
270
271  fail:
272         send_client_data(3, abort_msg, sizeof(abort_msg));
273         die("git upload-pack: %s", abort_msg);
274 }
275
276 static int got_sha1(char *hex, unsigned char *sha1)
277 {
278         struct object *o;
279         int we_knew_they_have = 0;
280
281         if (get_sha1_hex(hex, sha1))
282                 die("git upload-pack: expected SHA1 object, got '%s'", hex);
283         if (!has_sha1_file(sha1))
284                 return -1;
285
286         o = parse_object(sha1);
287         if (!o)
288                 die("oops (%s)", sha1_to_hex(sha1));
289         if (o->type == OBJ_COMMIT) {
290                 struct commit_list *parents;
291                 struct commit *commit = (struct commit *)o;
292                 if (o->flags & THEY_HAVE)
293                         we_knew_they_have = 1;
294                 else
295                         o->flags |= THEY_HAVE;
296                 if (!oldest_have || (commit->date < oldest_have))
297                         oldest_have = commit->date;
298                 for (parents = commit->parents;
299                      parents;
300                      parents = parents->next)
301                         parents->item->object.flags |= THEY_HAVE;
302         }
303         if (!we_knew_they_have) {
304                 add_object_array(o, NULL, &have_obj);
305                 return 1;
306         }
307         return 0;
308 }
309
310 static int reachable(struct commit *want)
311 {
312         struct commit_list *work = NULL;
313
314         commit_list_insert_by_date(want, &work);
315         while (work) {
316                 struct commit_list *list;
317                 struct commit *commit = pop_commit(&work);
318
319                 if (commit->object.flags & THEY_HAVE) {
320                         want->object.flags |= COMMON_KNOWN;
321                         break;
322                 }
323                 if (!commit->object.parsed)
324                         parse_object(commit->object.oid.hash);
325                 if (commit->object.flags & REACHABLE)
326                         continue;
327                 commit->object.flags |= REACHABLE;
328                 if (commit->date < oldest_have)
329                         continue;
330                 for (list = commit->parents; list; list = list->next) {
331                         struct commit *parent = list->item;
332                         if (!(parent->object.flags & REACHABLE))
333                                 commit_list_insert_by_date(parent, &work);
334                 }
335         }
336         want->object.flags |= REACHABLE;
337         clear_commit_marks(want, REACHABLE);
338         free_commit_list(work);
339         return (want->object.flags & COMMON_KNOWN);
340 }
341
342 static int ok_to_give_up(void)
343 {
344         int i;
345
346         if (!have_obj.nr)
347                 return 0;
348
349         for (i = 0; i < want_obj.nr; i++) {
350                 struct object *want = want_obj.objects[i].item;
351
352                 if (want->flags & COMMON_KNOWN)
353                         continue;
354                 want = deref_tag(want, "a want line", 0);
355                 if (!want || want->type != OBJ_COMMIT) {
356                         /* no way to tell if this is reachable by
357                          * looking at the ancestry chain alone, so
358                          * leave a note to ourselves not to worry about
359                          * this object anymore.
360                          */
361                         want_obj.objects[i].item->flags |= COMMON_KNOWN;
362                         continue;
363                 }
364                 if (!reachable((struct commit *)want))
365                         return 0;
366         }
367         return 1;
368 }
369
370 static int get_common_commits(void)
371 {
372         unsigned char sha1[20];
373         char last_hex[41];
374         int got_common = 0;
375         int got_other = 0;
376         int sent_ready = 0;
377
378         save_commit_buffer = 0;
379
380         for (;;) {
381                 char *line = packet_read_line(0, NULL);
382                 reset_timeout();
383
384                 if (!line) {
385                         if (multi_ack == 2 && got_common
386                             && !got_other && ok_to_give_up()) {
387                                 sent_ready = 1;
388                                 packet_write(1, "ACK %s ready\n", last_hex);
389                         }
390                         if (have_obj.nr == 0 || multi_ack)
391                                 packet_write(1, "NAK\n");
392
393                         if (no_done && sent_ready) {
394                                 packet_write(1, "ACK %s\n", last_hex);
395                                 return 0;
396                         }
397                         if (stateless_rpc)
398                                 exit(0);
399                         got_common = 0;
400                         got_other = 0;
401                         continue;
402                 }
403                 if (starts_with(line, "have ")) {
404                         switch (got_sha1(line+5, sha1)) {
405                         case -1: /* they have what we do not */
406                                 got_other = 1;
407                                 if (multi_ack && ok_to_give_up()) {
408                                         const char *hex = sha1_to_hex(sha1);
409                                         if (multi_ack == 2) {
410                                                 sent_ready = 1;
411                                                 packet_write(1, "ACK %s ready\n", hex);
412                                         } else
413                                                 packet_write(1, "ACK %s continue\n", hex);
414                                 }
415                                 break;
416                         default:
417                                 got_common = 1;
418                                 memcpy(last_hex, sha1_to_hex(sha1), 41);
419                                 if (multi_ack == 2)
420                                         packet_write(1, "ACK %s common\n", last_hex);
421                                 else if (multi_ack)
422                                         packet_write(1, "ACK %s continue\n", last_hex);
423                                 else if (have_obj.nr == 1)
424                                         packet_write(1, "ACK %s\n", last_hex);
425                                 break;
426                         }
427                         continue;
428                 }
429                 if (!strcmp(line, "done")) {
430                         if (have_obj.nr > 0) {
431                                 if (multi_ack)
432                                         packet_write(1, "ACK %s\n", last_hex);
433                                 return 0;
434                         }
435                         packet_write(1, "NAK\n");
436                         return -1;
437                 }
438                 die("git upload-pack: expected SHA1 list, got '%s'", line);
439         }
440 }
441
442 static int is_our_ref(struct object *o)
443 {
444         int allow_hidden_ref = (allow_unadvertised_object_request &
445                         (ALLOW_TIP_SHA1 | ALLOW_REACHABLE_SHA1));
446         return o->flags & ((allow_hidden_ref ? HIDDEN_REF : 0) | OUR_REF);
447 }
448
449 static void check_non_tip(void)
450 {
451         static const char *argv[] = {
452                 "rev-list", "--stdin", NULL,
453         };
454         static struct child_process cmd = CHILD_PROCESS_INIT;
455         struct object *o;
456         char namebuf[42]; /* ^ + SHA-1 + LF */
457         int i;
458
459         /*
460          * In the normal in-process case without
461          * uploadpack.allowReachableSHA1InWant,
462          * non-tip requests can never happen.
463          */
464         if (!stateless_rpc && !(allow_unadvertised_object_request & ALLOW_REACHABLE_SHA1))
465                 goto error;
466
467         cmd.argv = argv;
468         cmd.git_cmd = 1;
469         cmd.no_stderr = 1;
470         cmd.in = -1;
471         cmd.out = -1;
472
473         if (start_command(&cmd))
474                 goto error;
475
476         /*
477          * If rev-list --stdin encounters an unknown commit, it
478          * terminates, which will cause SIGPIPE in the write loop
479          * below.
480          */
481         sigchain_push(SIGPIPE, SIG_IGN);
482
483         namebuf[0] = '^';
484         namebuf[41] = '\n';
485         for (i = get_max_object_index(); 0 < i; ) {
486                 o = get_indexed_object(--i);
487                 if (!o)
488                         continue;
489                 if (!is_our_ref(o))
490                         continue;
491                 memcpy(namebuf + 1, oid_to_hex(&o->oid), GIT_SHA1_HEXSZ);
492                 if (write_in_full(cmd.in, namebuf, 42) < 0)
493                         goto error;
494         }
495         namebuf[40] = '\n';
496         for (i = 0; i < want_obj.nr; i++) {
497                 o = want_obj.objects[i].item;
498                 if (is_our_ref(o))
499                         continue;
500                 memcpy(namebuf, oid_to_hex(&o->oid), GIT_SHA1_HEXSZ);
501                 if (write_in_full(cmd.in, namebuf, 41) < 0)
502                         goto error;
503         }
504         close(cmd.in);
505
506         sigchain_pop(SIGPIPE);
507
508         /*
509          * The commits out of the rev-list are not ancestors of
510          * our ref.
511          */
512         i = read_in_full(cmd.out, namebuf, 1);
513         if (i)
514                 goto error;
515         close(cmd.out);
516
517         /*
518          * rev-list may have died by encountering a bad commit
519          * in the history, in which case we do want to bail out
520          * even when it showed no commit.
521          */
522         if (finish_command(&cmd))
523                 goto error;
524
525         /* All the non-tip ones are ancestors of what we advertised */
526         return;
527
528 error:
529         /* Pick one of them (we know there at least is one) */
530         for (i = 0; i < want_obj.nr; i++) {
531                 o = want_obj.objects[i].item;
532                 if (!is_our_ref(o))
533                         die("git upload-pack: not our ref %s",
534                             oid_to_hex(&o->oid));
535         }
536 }
537
538 static void receive_needs(void)
539 {
540         struct object_array shallows = OBJECT_ARRAY_INIT;
541         int depth = 0;
542         int has_non_tip = 0;
543
544         shallow_nr = 0;
545         for (;;) {
546                 struct object *o;
547                 const char *features;
548                 unsigned char sha1_buf[20];
549                 char *line = packet_read_line(0, NULL);
550                 reset_timeout();
551                 if (!line)
552                         break;
553
554                 if (starts_with(line, "shallow ")) {
555                         unsigned char sha1[20];
556                         struct object *object;
557                         if (get_sha1_hex(line + 8, sha1))
558                                 die("invalid shallow line: %s", line);
559                         object = parse_object(sha1);
560                         if (!object)
561                                 continue;
562                         if (object->type != OBJ_COMMIT)
563                                 die("invalid shallow object %s", sha1_to_hex(sha1));
564                         if (!(object->flags & CLIENT_SHALLOW)) {
565                                 object->flags |= CLIENT_SHALLOW;
566                                 add_object_array(object, NULL, &shallows);
567                         }
568                         continue;
569                 }
570                 if (starts_with(line, "deepen ")) {
571                         char *end;
572                         depth = strtol(line + 7, &end, 0);
573                         if (end == line + 7 || depth <= 0)
574                                 die("Invalid deepen: %s", line);
575                         continue;
576                 }
577                 if (!starts_with(line, "want ") ||
578                     get_sha1_hex(line+5, sha1_buf))
579                         die("git upload-pack: protocol error, "
580                             "expected to get sha, not '%s'", line);
581
582                 features = line + 45;
583
584                 if (parse_feature_request(features, "multi_ack_detailed"))
585                         multi_ack = 2;
586                 else if (parse_feature_request(features, "multi_ack"))
587                         multi_ack = 1;
588                 if (parse_feature_request(features, "no-done"))
589                         no_done = 1;
590                 if (parse_feature_request(features, "thin-pack"))
591                         use_thin_pack = 1;
592                 if (parse_feature_request(features, "ofs-delta"))
593                         use_ofs_delta = 1;
594                 if (parse_feature_request(features, "side-band-64k"))
595                         use_sideband = LARGE_PACKET_MAX;
596                 else if (parse_feature_request(features, "side-band"))
597                         use_sideband = DEFAULT_PACKET_MAX;
598                 if (parse_feature_request(features, "no-progress"))
599                         no_progress = 1;
600                 if (parse_feature_request(features, "include-tag"))
601                         use_include_tag = 1;
602
603                 o = parse_object(sha1_buf);
604                 if (!o)
605                         die("git upload-pack: not our ref %s",
606                             sha1_to_hex(sha1_buf));
607                 if (!(o->flags & WANTED)) {
608                         o->flags |= WANTED;
609                         if (!is_our_ref(o))
610                                 has_non_tip = 1;
611                         add_object_array(o, NULL, &want_obj);
612                 }
613         }
614
615         /*
616          * We have sent all our refs already, and the other end
617          * should have chosen out of them. When we are operating
618          * in the stateless RPC mode, however, their choice may
619          * have been based on the set of older refs advertised
620          * by another process that handled the initial request.
621          */
622         if (has_non_tip)
623                 check_non_tip();
624
625         if (!use_sideband && daemon_mode)
626                 no_progress = 1;
627
628         if (depth == 0 && shallows.nr == 0)
629                 return;
630         if (depth > 0) {
631                 struct commit_list *result = NULL, *backup = NULL;
632                 int i;
633                 if (depth == INFINITE_DEPTH && !is_repository_shallow())
634                         for (i = 0; i < shallows.nr; i++) {
635                                 struct object *object = shallows.objects[i].item;
636                                 object->flags |= NOT_SHALLOW;
637                         }
638                 else
639                         backup = result =
640                                 get_shallow_commits(&want_obj, depth,
641                                                     SHALLOW, NOT_SHALLOW);
642                 while (result) {
643                         struct object *object = &result->item->object;
644                         if (!(object->flags & (CLIENT_SHALLOW|NOT_SHALLOW))) {
645                                 packet_write(1, "shallow %s",
646                                                 oid_to_hex(&object->oid));
647                                 register_shallow(object->oid.hash);
648                                 shallow_nr++;
649                         }
650                         result = result->next;
651                 }
652                 free_commit_list(backup);
653                 for (i = 0; i < shallows.nr; i++) {
654                         struct object *object = shallows.objects[i].item;
655                         if (object->flags & NOT_SHALLOW) {
656                                 struct commit_list *parents;
657                                 packet_write(1, "unshallow %s",
658                                         oid_to_hex(&object->oid));
659                                 object->flags &= ~CLIENT_SHALLOW;
660                                 /* make sure the real parents are parsed */
661                                 unregister_shallow(object->oid.hash);
662                                 object->parsed = 0;
663                                 parse_commit_or_die((struct commit *)object);
664                                 parents = ((struct commit *)object)->parents;
665                                 while (parents) {
666                                         add_object_array(&parents->item->object,
667                                                         NULL, &want_obj);
668                                         parents = parents->next;
669                                 }
670                                 add_object_array(object, NULL, &extra_edge_obj);
671                         }
672                         /* make sure commit traversal conforms to client */
673                         register_shallow(object->oid.hash);
674                 }
675                 packet_flush(1);
676         } else
677                 if (shallows.nr > 0) {
678                         int i;
679                         for (i = 0; i < shallows.nr; i++)
680                                 register_shallow(shallows.objects[i].item->oid.hash);
681                 }
682
683         shallow_nr += shallows.nr;
684         free(shallows.objects);
685 }
686
687 /* return non-zero if the ref is hidden, otherwise 0 */
688 static int mark_our_ref(const char *refname, const char *refname_full,
689                         const struct object_id *oid)
690 {
691         struct object *o = lookup_unknown_object(oid->hash);
692
693         if (ref_is_hidden(refname, refname_full)) {
694                 o->flags |= HIDDEN_REF;
695                 return 1;
696         }
697         o->flags |= OUR_REF;
698         return 0;
699 }
700
701 static int check_ref(const char *refname_full, const struct object_id *oid,
702                      int flag, void *cb_data)
703 {
704         const char *refname = strip_namespace(refname_full);
705
706         mark_our_ref(refname, refname_full, oid);
707         return 0;
708 }
709
710 static void format_symref_info(struct strbuf *buf, struct string_list *symref)
711 {
712         struct string_list_item *item;
713
714         if (!symref->nr)
715                 return;
716         for_each_string_list_item(item, symref)
717                 strbuf_addf(buf, " symref=%s:%s", item->string, (char *)item->util);
718 }
719
720 static int send_ref(const char *refname, const struct object_id *oid,
721                     int flag, void *cb_data)
722 {
723         static const char *capabilities = "multi_ack thin-pack side-band"
724                 " side-band-64k ofs-delta shallow no-progress"
725                 " include-tag multi_ack_detailed";
726         const char *refname_nons = strip_namespace(refname);
727         struct object_id peeled;
728
729         if (mark_our_ref(refname_nons, refname, oid))
730                 return 0;
731
732         if (capabilities) {
733                 struct strbuf symref_info = STRBUF_INIT;
734
735                 format_symref_info(&symref_info, cb_data);
736                 packet_write(1, "%s %s%c%s%s%s%s%s agent=%s\n",
737                              oid_to_hex(oid), refname_nons,
738                              0, capabilities,
739                              (allow_unadvertised_object_request & ALLOW_TIP_SHA1) ?
740                                      " allow-tip-sha1-in-want" : "",
741                              (allow_unadvertised_object_request & ALLOW_REACHABLE_SHA1) ?
742                                      " allow-reachable-sha1-in-want" : "",
743                              stateless_rpc ? " no-done" : "",
744                              symref_info.buf,
745                              git_user_agent_sanitized());
746                 strbuf_release(&symref_info);
747         } else {
748                 packet_write(1, "%s %s\n", oid_to_hex(oid), refname_nons);
749         }
750         capabilities = NULL;
751         if (!peel_ref(refname, peeled.hash))
752                 packet_write(1, "%s %s^{}\n", oid_to_hex(&peeled), refname_nons);
753         return 0;
754 }
755
756 static int find_symref(const char *refname, const struct object_id *oid,
757                        int flag, void *cb_data)
758 {
759         const char *symref_target;
760         struct string_list_item *item;
761         struct object_id unused;
762
763         if ((flag & REF_ISSYMREF) == 0)
764                 return 0;
765         symref_target = resolve_ref_unsafe(refname, 0, unused.hash, &flag);
766         if (!symref_target || (flag & REF_ISSYMREF) == 0)
767                 die("'%s' is a symref but it is not?", refname);
768         item = string_list_append(cb_data, refname);
769         item->util = xstrdup(symref_target);
770         return 0;
771 }
772
773 static void upload_pack(void)
774 {
775         struct string_list symref = STRING_LIST_INIT_DUP;
776
777         head_ref_namespaced(find_symref, &symref);
778
779         if (advertise_refs || !stateless_rpc) {
780                 reset_timeout();
781                 head_ref_namespaced(send_ref, &symref);
782                 for_each_namespaced_ref(send_ref, &symref);
783                 advertise_shallow_grafts(1);
784                 packet_flush(1);
785         } else {
786                 head_ref_namespaced(check_ref, NULL);
787                 for_each_namespaced_ref(check_ref, NULL);
788         }
789         string_list_clear(&symref, 1);
790         if (advertise_refs)
791                 return;
792
793         receive_needs();
794         if (want_obj.nr) {
795                 get_common_commits();
796                 create_pack_file();
797         }
798 }
799
800 static int upload_pack_config(const char *var, const char *value, void *unused)
801 {
802         if (!strcmp("uploadpack.allowtipsha1inwant", var)) {
803                 if (git_config_bool(var, value))
804                         allow_unadvertised_object_request |= ALLOW_TIP_SHA1;
805                 else
806                         allow_unadvertised_object_request &= ~ALLOW_TIP_SHA1;
807         } else if (!strcmp("uploadpack.allowreachablesha1inwant", var)) {
808                 if (git_config_bool(var, value))
809                         allow_unadvertised_object_request |= ALLOW_REACHABLE_SHA1;
810                 else
811                         allow_unadvertised_object_request &= ~ALLOW_REACHABLE_SHA1;
812         } else if (!strcmp("uploadpack.keepalive", var)) {
813                 keepalive = git_config_int(var, value);
814                 if (!keepalive)
815                         keepalive = -1;
816         }
817         return parse_hide_refs_config(var, value, "uploadpack");
818 }
819
820 int main(int argc, char **argv)
821 {
822         char *dir;
823         int i;
824         int strict = 0;
825
826         git_setup_gettext();
827
828         packet_trace_identity("upload-pack");
829         git_extract_argv0_path(argv[0]);
830         check_replace_refs = 0;
831
832         for (i = 1; i < argc; i++) {
833                 char *arg = argv[i];
834
835                 if (arg[0] != '-')
836                         break;
837                 if (!strcmp(arg, "--advertise-refs")) {
838                         advertise_refs = 1;
839                         continue;
840                 }
841                 if (!strcmp(arg, "--stateless-rpc")) {
842                         stateless_rpc = 1;
843                         continue;
844                 }
845                 if (!strcmp(arg, "--strict")) {
846                         strict = 1;
847                         continue;
848                 }
849                 if (starts_with(arg, "--timeout=")) {
850                         timeout = atoi(arg+10);
851                         daemon_mode = 1;
852                         continue;
853                 }
854                 if (!strcmp(arg, "--")) {
855                         i++;
856                         break;
857                 }
858         }
859
860         if (i != argc-1)
861                 usage(upload_pack_usage);
862
863         setup_path();
864
865         dir = argv[i];
866
867         if (!enter_repo(dir, strict))
868                 die("'%s' does not appear to be a git repository", dir);
869
870         git_config(upload_pack_config, NULL);
871         upload_pack();
872         return 0;
873 }