Merge branch 'mm/describe-doc' into maint
[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 static int allow_tip_sha1_in_want;
39 static int shallow_nr;
40 static struct object_array have_obj;
41 static struct object_array want_obj;
42 static struct object_array extra_edge_obj;
43 static unsigned int timeout;
44 static int keepalive = 5;
45 /* 0 for no sideband,
46  * otherwise maximum packet size (up to 65520 bytes).
47  */
48 static int use_sideband;
49 static int advertise_refs;
50 static int stateless_rpc;
51
52 static void reset_timeout(void)
53 {
54         alarm(timeout);
55 }
56
57 static ssize_t send_client_data(int fd, const char *data, ssize_t sz)
58 {
59         if (use_sideband)
60                 return send_sideband(1, fd, data, sz, use_sideband);
61         if (fd == 3)
62                 /* emergency quit */
63                 fd = 2;
64         if (fd == 2) {
65                 /* XXX: are we happy to lose stuff here? */
66                 xwrite(fd, data, sz);
67                 return sz;
68         }
69         write_or_die(fd, data, sz);
70         return sz;
71 }
72
73 static int write_one_shallow(const struct commit_graft *graft, void *cb_data)
74 {
75         FILE *fp = cb_data;
76         if (graft->nr_parent == -1)
77                 fprintf(fp, "--shallow %s\n", sha1_to_hex(graft->sha1));
78         return 0;
79 }
80
81 static void create_pack_file(void)
82 {
83         struct child_process pack_objects = CHILD_PROCESS_INIT;
84         char data[8193], progress[128];
85         char abort_msg[] = "aborting due to possible repository "
86                 "corruption on the remote side.";
87         int buffered = -1;
88         ssize_t sz;
89         const char *argv[13];
90         int i, arg = 0;
91         FILE *pipe_fd;
92
93         if (shallow_nr) {
94                 argv[arg++] = "--shallow-file";
95                 argv[arg++] = "";
96         }
97         argv[arg++] = "pack-objects";
98         argv[arg++] = "--revs";
99         if (use_thin_pack)
100                 argv[arg++] = "--thin";
101
102         argv[arg++] = "--stdout";
103         if (shallow_nr)
104                 argv[arg++] = "--shallow";
105         if (!no_progress)
106                 argv[arg++] = "--progress";
107         if (use_ofs_delta)
108                 argv[arg++] = "--delta-base-offset";
109         if (use_include_tag)
110                 argv[arg++] = "--include-tag";
111         argv[arg++] = NULL;
112
113         pack_objects.in = -1;
114         pack_objects.out = -1;
115         pack_objects.err = -1;
116         pack_objects.git_cmd = 1;
117         pack_objects.argv = argv;
118
119         if (start_command(&pack_objects))
120                 die("git upload-pack: unable to fork git-pack-objects");
121
122         pipe_fd = xfdopen(pack_objects.in, "w");
123
124         if (shallow_nr)
125                 for_each_commit_graft(write_one_shallow, pipe_fd);
126
127         for (i = 0; i < want_obj.nr; i++)
128                 fprintf(pipe_fd, "%s\n",
129                         sha1_to_hex(want_obj.objects[i].item->sha1));
130         fprintf(pipe_fd, "--not\n");
131         for (i = 0; i < have_obj.nr; i++)
132                 fprintf(pipe_fd, "%s\n",
133                         sha1_to_hex(have_obj.objects[i].item->sha1));
134         for (i = 0; i < extra_edge_obj.nr; i++)
135                 fprintf(pipe_fd, "%s\n",
136                         sha1_to_hex(extra_edge_obj.objects[i].item->sha1));
137         fprintf(pipe_fd, "\n");
138         fflush(pipe_fd);
139         fclose(pipe_fd);
140
141         /* We read from pack_objects.err to capture stderr output for
142          * progress bar, and pack_objects.out to capture the pack data.
143          */
144
145         while (1) {
146                 struct pollfd pfd[2];
147                 int pe, pu, pollsize;
148                 int ret;
149
150                 reset_timeout();
151
152                 pollsize = 0;
153                 pe = pu = -1;
154
155                 if (0 <= pack_objects.out) {
156                         pfd[pollsize].fd = pack_objects.out;
157                         pfd[pollsize].events = POLLIN;
158                         pu = pollsize;
159                         pollsize++;
160                 }
161                 if (0 <= pack_objects.err) {
162                         pfd[pollsize].fd = pack_objects.err;
163                         pfd[pollsize].events = POLLIN;
164                         pe = pollsize;
165                         pollsize++;
166                 }
167
168                 if (!pollsize)
169                         break;
170
171                 ret = poll(pfd, pollsize,
172                         keepalive < 0 ? -1 : 1000 * keepalive);
173
174                 if (ret < 0) {
175                         if (errno != EINTR) {
176                                 error("poll failed, resuming: %s",
177                                       strerror(errno));
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 = work->next;
316                 struct commit *commit = work->item;
317                 free(work);
318                 work = list;
319
320                 if (commit->object.flags & THEY_HAVE) {
321                         want->object.flags |= COMMON_KNOWN;
322                         break;
323                 }
324                 if (!commit->object.parsed)
325                         parse_object(commit->object.sha1);
326                 if (commit->object.flags & REACHABLE)
327                         continue;
328                 commit->object.flags |= REACHABLE;
329                 if (commit->date < oldest_have)
330                         continue;
331                 for (list = commit->parents; list; list = list->next) {
332                         struct commit *parent = list->item;
333                         if (!(parent->object.flags & REACHABLE))
334                                 commit_list_insert_by_date(parent, &work);
335                 }
336         }
337         want->object.flags |= REACHABLE;
338         clear_commit_marks(want, REACHABLE);
339         free_commit_list(work);
340         return (want->object.flags & COMMON_KNOWN);
341 }
342
343 static int ok_to_give_up(void)
344 {
345         int i;
346
347         if (!have_obj.nr)
348                 return 0;
349
350         for (i = 0; i < want_obj.nr; i++) {
351                 struct object *want = want_obj.objects[i].item;
352
353                 if (want->flags & COMMON_KNOWN)
354                         continue;
355                 want = deref_tag(want, "a want line", 0);
356                 if (!want || want->type != OBJ_COMMIT) {
357                         /* no way to tell if this is reachable by
358                          * looking at the ancestry chain alone, so
359                          * leave a note to ourselves not to worry about
360                          * this object anymore.
361                          */
362                         want_obj.objects[i].item->flags |= COMMON_KNOWN;
363                         continue;
364                 }
365                 if (!reachable((struct commit *)want))
366                         return 0;
367         }
368         return 1;
369 }
370
371 static int get_common_commits(void)
372 {
373         unsigned char sha1[20];
374         char last_hex[41];
375         int got_common = 0;
376         int got_other = 0;
377         int sent_ready = 0;
378
379         save_commit_buffer = 0;
380
381         for (;;) {
382                 char *line = packet_read_line(0, NULL);
383                 reset_timeout();
384
385                 if (!line) {
386                         if (multi_ack == 2 && got_common
387                             && !got_other && ok_to_give_up()) {
388                                 sent_ready = 1;
389                                 packet_write(1, "ACK %s ready\n", last_hex);
390                         }
391                         if (have_obj.nr == 0 || multi_ack)
392                                 packet_write(1, "NAK\n");
393
394                         if (no_done && sent_ready) {
395                                 packet_write(1, "ACK %s\n", last_hex);
396                                 return 0;
397                         }
398                         if (stateless_rpc)
399                                 exit(0);
400                         got_common = 0;
401                         got_other = 0;
402                         continue;
403                 }
404                 if (starts_with(line, "have ")) {
405                         switch (got_sha1(line+5, sha1)) {
406                         case -1: /* they have what we do not */
407                                 got_other = 1;
408                                 if (multi_ack && ok_to_give_up()) {
409                                         const char *hex = sha1_to_hex(sha1);
410                                         if (multi_ack == 2) {
411                                                 sent_ready = 1;
412                                                 packet_write(1, "ACK %s ready\n", hex);
413                                         } else
414                                                 packet_write(1, "ACK %s continue\n", hex);
415                                 }
416                                 break;
417                         default:
418                                 got_common = 1;
419                                 memcpy(last_hex, sha1_to_hex(sha1), 41);
420                                 if (multi_ack == 2)
421                                         packet_write(1, "ACK %s common\n", last_hex);
422                                 else if (multi_ack)
423                                         packet_write(1, "ACK %s continue\n", last_hex);
424                                 else if (have_obj.nr == 1)
425                                         packet_write(1, "ACK %s\n", last_hex);
426                                 break;
427                         }
428                         continue;
429                 }
430                 if (!strcmp(line, "done")) {
431                         if (have_obj.nr > 0) {
432                                 if (multi_ack)
433                                         packet_write(1, "ACK %s\n", last_hex);
434                                 return 0;
435                         }
436                         packet_write(1, "NAK\n");
437                         return -1;
438                 }
439                 die("git upload-pack: expected SHA1 list, got '%s'", line);
440         }
441 }
442
443 static int is_our_ref(struct object *o)
444 {
445         return o->flags &
446                 ((allow_tip_sha1_in_want ? 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         /* In the normal in-process case non-tip request can never happen */
460         if (!stateless_rpc)
461                 goto error;
462
463         cmd.argv = argv;
464         cmd.git_cmd = 1;
465         cmd.no_stderr = 1;
466         cmd.in = -1;
467         cmd.out = -1;
468
469         if (start_command(&cmd))
470                 goto error;
471
472         /*
473          * If rev-list --stdin encounters an unknown commit, it
474          * terminates, which will cause SIGPIPE in the write loop
475          * below.
476          */
477         sigchain_push(SIGPIPE, SIG_IGN);
478
479         namebuf[0] = '^';
480         namebuf[41] = '\n';
481         for (i = get_max_object_index(); 0 < i; ) {
482                 o = get_indexed_object(--i);
483                 if (!o)
484                         continue;
485                 if (!is_our_ref(o))
486                         continue;
487                 memcpy(namebuf + 1, sha1_to_hex(o->sha1), 40);
488                 if (write_in_full(cmd.in, namebuf, 42) < 0)
489                         goto error;
490         }
491         namebuf[40] = '\n';
492         for (i = 0; i < want_obj.nr; i++) {
493                 o = want_obj.objects[i].item;
494                 if (is_our_ref(o))
495                         continue;
496                 memcpy(namebuf, sha1_to_hex(o->sha1), 40);
497                 if (write_in_full(cmd.in, namebuf, 41) < 0)
498                         goto error;
499         }
500         close(cmd.in);
501
502         sigchain_pop(SIGPIPE);
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
513         /*
514          * rev-list may have died by encountering a bad commit
515          * in the history, in which case we do want to bail out
516          * even when it showed no commit.
517          */
518         if (finish_command(&cmd))
519                 goto error;
520
521         /* All the non-tip ones are ancestors of what we advertised */
522         return;
523
524 error:
525         /* Pick one of them (we know there at least is one) */
526         for (i = 0; i < want_obj.nr; i++) {
527                 o = want_obj.objects[i].item;
528                 if (!is_our_ref(o))
529                         die("git upload-pack: not our ref %s",
530                             sha1_to_hex(o->sha1));
531         }
532 }
533
534 static void receive_needs(void)
535 {
536         struct object_array shallows = OBJECT_ARRAY_INIT;
537         int depth = 0;
538         int has_non_tip = 0;
539
540         shallow_nr = 0;
541         for (;;) {
542                 struct object *o;
543                 const char *features;
544                 unsigned char sha1_buf[20];
545                 char *line = packet_read_line(0, NULL);
546                 reset_timeout();
547                 if (!line)
548                         break;
549
550                 if (starts_with(line, "shallow ")) {
551                         unsigned char sha1[20];
552                         struct object *object;
553                         if (get_sha1_hex(line + 8, sha1))
554                                 die("invalid shallow line: %s", line);
555                         object = parse_object(sha1);
556                         if (!object)
557                                 continue;
558                         if (object->type != OBJ_COMMIT)
559                                 die("invalid shallow object %s", sha1_to_hex(sha1));
560                         if (!(object->flags & CLIENT_SHALLOW)) {
561                                 object->flags |= CLIENT_SHALLOW;
562                                 add_object_array(object, NULL, &shallows);
563                         }
564                         continue;
565                 }
566                 if (starts_with(line, "deepen ")) {
567                         char *end;
568                         depth = strtol(line + 7, &end, 0);
569                         if (end == line + 7 || depth <= 0)
570                                 die("Invalid deepen: %s", line);
571                         continue;
572                 }
573                 if (!starts_with(line, "want ") ||
574                     get_sha1_hex(line+5, sha1_buf))
575                         die("git upload-pack: protocol error, "
576                             "expected to get sha, not '%s'", line);
577
578                 features = line + 45;
579
580                 if (parse_feature_request(features, "multi_ack_detailed"))
581                         multi_ack = 2;
582                 else if (parse_feature_request(features, "multi_ack"))
583                         multi_ack = 1;
584                 if (parse_feature_request(features, "no-done"))
585                         no_done = 1;
586                 if (parse_feature_request(features, "thin-pack"))
587                         use_thin_pack = 1;
588                 if (parse_feature_request(features, "ofs-delta"))
589                         use_ofs_delta = 1;
590                 if (parse_feature_request(features, "side-band-64k"))
591                         use_sideband = LARGE_PACKET_MAX;
592                 else if (parse_feature_request(features, "side-band"))
593                         use_sideband = DEFAULT_PACKET_MAX;
594                 if (parse_feature_request(features, "no-progress"))
595                         no_progress = 1;
596                 if (parse_feature_request(features, "include-tag"))
597                         use_include_tag = 1;
598
599                 o = parse_object(sha1_buf);
600                 if (!o)
601                         die("git upload-pack: not our ref %s",
602                             sha1_to_hex(sha1_buf));
603                 if (!(o->flags & WANTED)) {
604                         o->flags |= WANTED;
605                         if (!is_our_ref(o))
606                                 has_non_tip = 1;
607                         add_object_array(o, NULL, &want_obj);
608                 }
609         }
610
611         /*
612          * We have sent all our refs already, and the other end
613          * should have chosen out of them. When we are operating
614          * in the stateless RPC mode, however, their choice may
615          * have been based on the set of older refs advertised
616          * by another process that handled the initial request.
617          */
618         if (has_non_tip)
619                 check_non_tip();
620
621         if (!use_sideband && daemon_mode)
622                 no_progress = 1;
623
624         if (depth == 0 && shallows.nr == 0)
625                 return;
626         if (depth > 0) {
627                 struct commit_list *result = NULL, *backup = NULL;
628                 int i;
629                 if (depth == INFINITE_DEPTH && !is_repository_shallow())
630                         for (i = 0; i < shallows.nr; i++) {
631                                 struct object *object = shallows.objects[i].item;
632                                 object->flags |= NOT_SHALLOW;
633                         }
634                 else
635                         backup = result =
636                                 get_shallow_commits(&want_obj, depth,
637                                                     SHALLOW, NOT_SHALLOW);
638                 while (result) {
639                         struct object *object = &result->item->object;
640                         if (!(object->flags & (CLIENT_SHALLOW|NOT_SHALLOW))) {
641                                 packet_write(1, "shallow %s",
642                                                 sha1_to_hex(object->sha1));
643                                 register_shallow(object->sha1);
644                                 shallow_nr++;
645                         }
646                         result = result->next;
647                 }
648                 free_commit_list(backup);
649                 for (i = 0; i < shallows.nr; i++) {
650                         struct object *object = shallows.objects[i].item;
651                         if (object->flags & NOT_SHALLOW) {
652                                 struct commit_list *parents;
653                                 packet_write(1, "unshallow %s",
654                                         sha1_to_hex(object->sha1));
655                                 object->flags &= ~CLIENT_SHALLOW;
656                                 /* make sure the real parents are parsed */
657                                 unregister_shallow(object->sha1);
658                                 object->parsed = 0;
659                                 parse_commit_or_die((struct commit *)object);
660                                 parents = ((struct commit *)object)->parents;
661                                 while (parents) {
662                                         add_object_array(&parents->item->object,
663                                                         NULL, &want_obj);
664                                         parents = parents->next;
665                                 }
666                                 add_object_array(object, NULL, &extra_edge_obj);
667                         }
668                         /* make sure commit traversal conforms to client */
669                         register_shallow(object->sha1);
670                 }
671                 packet_flush(1);
672         } else
673                 if (shallows.nr > 0) {
674                         int i;
675                         for (i = 0; i < shallows.nr; i++)
676                                 register_shallow(shallows.objects[i].item->sha1);
677                 }
678
679         shallow_nr += shallows.nr;
680         free(shallows.objects);
681 }
682
683 /* return non-zero if the ref is hidden, otherwise 0 */
684 static int mark_our_ref(const char *refname, const unsigned char *sha1)
685 {
686         struct object *o = lookup_unknown_object(sha1);
687
688         if (ref_is_hidden(refname)) {
689                 o->flags |= HIDDEN_REF;
690                 return 1;
691         }
692         o->flags |= OUR_REF;
693         return 0;
694 }
695
696 static int check_ref(const char *refname, const unsigned char *sha1, int flag, void *cb_data)
697 {
698         mark_our_ref(refname, sha1);
699         return 0;
700 }
701
702 static void format_symref_info(struct strbuf *buf, struct string_list *symref)
703 {
704         struct string_list_item *item;
705
706         if (!symref->nr)
707                 return;
708         for_each_string_list_item(item, symref)
709                 strbuf_addf(buf, " symref=%s:%s", item->string, (char *)item->util);
710 }
711
712 static int send_ref(const char *refname, const unsigned char *sha1, int flag, void *cb_data)
713 {
714         static const char *capabilities = "multi_ack thin-pack side-band"
715                 " side-band-64k ofs-delta shallow no-progress"
716                 " include-tag multi_ack_detailed";
717         const char *refname_nons = strip_namespace(refname);
718         unsigned char peeled[20];
719
720         if (mark_our_ref(refname, sha1))
721                 return 0;
722
723         if (capabilities) {
724                 struct strbuf symref_info = STRBUF_INIT;
725
726                 format_symref_info(&symref_info, cb_data);
727                 packet_write(1, "%s %s%c%s%s%s%s agent=%s\n",
728                              sha1_to_hex(sha1), refname_nons,
729                              0, capabilities,
730                              allow_tip_sha1_in_want ? " allow-tip-sha1-in-want" : "",
731                              stateless_rpc ? " no-done" : "",
732                              symref_info.buf,
733                              git_user_agent_sanitized());
734                 strbuf_release(&symref_info);
735         } else {
736                 packet_write(1, "%s %s\n", sha1_to_hex(sha1), refname_nons);
737         }
738         capabilities = NULL;
739         if (!peel_ref(refname, peeled))
740                 packet_write(1, "%s %s^{}\n", sha1_to_hex(peeled), refname_nons);
741         return 0;
742 }
743
744 static int find_symref(const char *refname, const unsigned char *sha1, int flag,
745                        void *cb_data)
746 {
747         const char *symref_target;
748         struct string_list_item *item;
749         unsigned char unused[20];
750
751         if ((flag & REF_ISSYMREF) == 0)
752                 return 0;
753         symref_target = resolve_ref_unsafe(refname, 0, unused, &flag);
754         if (!symref_target || (flag & REF_ISSYMREF) == 0)
755                 die("'%s' is a symref but it is not?", refname);
756         item = string_list_append(cb_data, refname);
757         item->util = xstrdup(symref_target);
758         return 0;
759 }
760
761 static void upload_pack(void)
762 {
763         struct string_list symref = STRING_LIST_INIT_DUP;
764
765         head_ref_namespaced(find_symref, &symref);
766
767         if (advertise_refs || !stateless_rpc) {
768                 reset_timeout();
769                 head_ref_namespaced(send_ref, &symref);
770                 for_each_namespaced_ref(send_ref, &symref);
771                 advertise_shallow_grafts(1);
772                 packet_flush(1);
773         } else {
774                 head_ref_namespaced(check_ref, NULL);
775                 for_each_namespaced_ref(check_ref, NULL);
776         }
777         string_list_clear(&symref, 1);
778         if (advertise_refs)
779                 return;
780
781         receive_needs();
782         if (want_obj.nr) {
783                 get_common_commits();
784                 create_pack_file();
785         }
786 }
787
788 static int upload_pack_config(const char *var, const char *value, void *unused)
789 {
790         if (!strcmp("uploadpack.allowtipsha1inwant", var))
791                 allow_tip_sha1_in_want = git_config_bool(var, value);
792         else if (!strcmp("uploadpack.keepalive", var)) {
793                 keepalive = git_config_int(var, value);
794                 if (!keepalive)
795                         keepalive = -1;
796         }
797         return parse_hide_refs_config(var, value, "uploadpack");
798 }
799
800 int main(int argc, char **argv)
801 {
802         char *dir;
803         int i;
804         int strict = 0;
805
806         git_setup_gettext();
807
808         packet_trace_identity("upload-pack");
809         git_extract_argv0_path(argv[0]);
810         check_replace_refs = 0;
811
812         for (i = 1; i < argc; i++) {
813                 char *arg = argv[i];
814
815                 if (arg[0] != '-')
816                         break;
817                 if (!strcmp(arg, "--advertise-refs")) {
818                         advertise_refs = 1;
819                         continue;
820                 }
821                 if (!strcmp(arg, "--stateless-rpc")) {
822                         stateless_rpc = 1;
823                         continue;
824                 }
825                 if (!strcmp(arg, "--strict")) {
826                         strict = 1;
827                         continue;
828                 }
829                 if (starts_with(arg, "--timeout=")) {
830                         timeout = atoi(arg+10);
831                         daemon_mode = 1;
832                         continue;
833                 }
834                 if (!strcmp(arg, "--")) {
835                         i++;
836                         break;
837                 }
838         }
839
840         if (i != argc-1)
841                 usage(upload_pack_usage);
842
843         setup_path();
844
845         dir = argv[i];
846
847         if (!enter_repo(dir, strict))
848                 die("'%s' does not appear to be a git repository", dir);
849
850         git_config(upload_pack_config, NULL);
851         upload_pack();
852         return 0;
853 }