git-p4: test and document --use-client-spec
[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 "sigchain.h"
14
15 static const char upload_pack_usage[] = "git upload-pack [--strict] [--timeout=<n>] <dir>";
16
17 /* bits #0..7 in revision.h, #8..10 in commit.c */
18 #define THEY_HAVE       (1u << 11)
19 #define OUR_REF         (1u << 12)
20 #define WANTED          (1u << 13)
21 #define COMMON_KNOWN    (1u << 14)
22 #define REACHABLE       (1u << 15)
23
24 #define SHALLOW         (1u << 16)
25 #define NOT_SHALLOW     (1u << 17)
26 #define CLIENT_SHALLOW  (1u << 18)
27
28 static unsigned long oldest_have;
29
30 static int multi_ack, nr_our_refs;
31 static int no_done;
32 static int use_thin_pack, use_ofs_delta, use_include_tag;
33 static int no_progress, daemon_mode;
34 static int shallow_nr;
35 static struct object_array have_obj;
36 static struct object_array want_obj;
37 static struct object_array extra_edge_obj;
38 static unsigned int timeout;
39 /* 0 for no sideband,
40  * otherwise maximum packet size (up to 65520 bytes).
41  */
42 static int use_sideband;
43 static int debug_fd;
44 static int advertise_refs;
45 static int stateless_rpc;
46
47 static void reset_timeout(void)
48 {
49         alarm(timeout);
50 }
51
52 static int strip(char *line, int len)
53 {
54         if (len && line[len-1] == '\n')
55                 line[--len] = 0;
56         return len;
57 }
58
59 static ssize_t send_client_data(int fd, const char *data, ssize_t sz)
60 {
61         if (use_sideband)
62                 return send_sideband(1, fd, data, sz, use_sideband);
63         if (fd == 3)
64                 /* emergency quit */
65                 fd = 2;
66         if (fd == 2) {
67                 /* XXX: are we happy to lose stuff here? */
68                 xwrite(fd, data, sz);
69                 return sz;
70         }
71         return safe_write(fd, data, sz);
72 }
73
74 static FILE *pack_pipe = NULL;
75 static void show_commit(struct commit *commit, void *data)
76 {
77         if (commit->object.flags & BOUNDARY)
78                 fputc('-', pack_pipe);
79         if (fputs(sha1_to_hex(commit->object.sha1), pack_pipe) < 0)
80                 die("broken output pipe");
81         fputc('\n', pack_pipe);
82         fflush(pack_pipe);
83         free(commit->buffer);
84         commit->buffer = NULL;
85 }
86
87 static void show_object(struct object *obj,
88                         const struct name_path *path, const char *component,
89                         void *cb_data)
90 {
91         show_object_with_name(pack_pipe, obj, path, component);
92 }
93
94 static void show_edge(struct commit *commit)
95 {
96         fprintf(pack_pipe, "-%s\n", sha1_to_hex(commit->object.sha1));
97 }
98
99 static int do_rev_list(int in, int out, void *user_data)
100 {
101         int i;
102         struct rev_info revs;
103
104         pack_pipe = xfdopen(out, "w");
105         init_revisions(&revs, NULL);
106         revs.tag_objects = 1;
107         revs.tree_objects = 1;
108         revs.blob_objects = 1;
109         if (use_thin_pack)
110                 revs.edge_hint = 1;
111
112         for (i = 0; i < want_obj.nr; i++) {
113                 struct object *o = want_obj.objects[i].item;
114                 /* why??? */
115                 o->flags &= ~UNINTERESTING;
116                 add_pending_object(&revs, o, NULL);
117         }
118         for (i = 0; i < have_obj.nr; i++) {
119                 struct object *o = have_obj.objects[i].item;
120                 o->flags |= UNINTERESTING;
121                 add_pending_object(&revs, o, NULL);
122         }
123         setup_revisions(0, NULL, &revs, NULL);
124         if (prepare_revision_walk(&revs))
125                 die("revision walk setup failed");
126         mark_edges_uninteresting(revs.commits, &revs, show_edge);
127         if (use_thin_pack)
128                 for (i = 0; i < extra_edge_obj.nr; i++)
129                         fprintf(pack_pipe, "-%s\n", sha1_to_hex(
130                                         extra_edge_obj.objects[i].item->sha1));
131         traverse_commit_list(&revs, show_commit, show_object, NULL);
132         fflush(pack_pipe);
133         fclose(pack_pipe);
134         return 0;
135 }
136
137 static void create_pack_file(void)
138 {
139         struct async rev_list;
140         struct child_process pack_objects;
141         int create_full_pack = (nr_our_refs == want_obj.nr && !have_obj.nr);
142         char data[8193], progress[128];
143         char abort_msg[] = "aborting due to possible repository "
144                 "corruption on the remote side.";
145         int buffered = -1;
146         ssize_t sz;
147         const char *argv[10];
148         int arg = 0;
149
150         argv[arg++] = "pack-objects";
151         if (!shallow_nr) {
152                 argv[arg++] = "--revs";
153                 if (create_full_pack)
154                         argv[arg++] = "--all";
155                 else if (use_thin_pack)
156                         argv[arg++] = "--thin";
157         }
158
159         argv[arg++] = "--stdout";
160         if (!no_progress)
161                 argv[arg++] = "--progress";
162         if (use_ofs_delta)
163                 argv[arg++] = "--delta-base-offset";
164         if (use_include_tag)
165                 argv[arg++] = "--include-tag";
166         argv[arg++] = NULL;
167
168         memset(&pack_objects, 0, sizeof(pack_objects));
169         pack_objects.in = -1;
170         pack_objects.out = -1;
171         pack_objects.err = -1;
172         pack_objects.git_cmd = 1;
173         pack_objects.argv = argv;
174
175         if (start_command(&pack_objects))
176                 die("git upload-pack: unable to fork git-pack-objects");
177
178         if (shallow_nr) {
179                 memset(&rev_list, 0, sizeof(rev_list));
180                 rev_list.proc = do_rev_list;
181                 rev_list.out = pack_objects.in;
182                 if (start_async(&rev_list))
183                         die("git upload-pack: unable to fork git-rev-list");
184         }
185         else {
186                 FILE *pipe_fd = xfdopen(pack_objects.in, "w");
187                 if (!create_full_pack) {
188                         int i;
189                         for (i = 0; i < want_obj.nr; i++)
190                                 fprintf(pipe_fd, "%s\n", sha1_to_hex(want_obj.objects[i].item->sha1));
191                         fprintf(pipe_fd, "--not\n");
192                         for (i = 0; i < have_obj.nr; i++)
193                                 fprintf(pipe_fd, "%s\n", sha1_to_hex(have_obj.objects[i].item->sha1));
194                 }
195
196                 fprintf(pipe_fd, "\n");
197                 fflush(pipe_fd);
198                 fclose(pipe_fd);
199         }
200
201
202         /* We read from pack_objects.err to capture stderr output for
203          * progress bar, and pack_objects.out to capture the pack data.
204          */
205
206         while (1) {
207                 struct pollfd pfd[2];
208                 int pe, pu, pollsize;
209
210                 reset_timeout();
211
212                 pollsize = 0;
213                 pe = pu = -1;
214
215                 if (0 <= pack_objects.out) {
216                         pfd[pollsize].fd = pack_objects.out;
217                         pfd[pollsize].events = POLLIN;
218                         pu = pollsize;
219                         pollsize++;
220                 }
221                 if (0 <= pack_objects.err) {
222                         pfd[pollsize].fd = pack_objects.err;
223                         pfd[pollsize].events = POLLIN;
224                         pe = pollsize;
225                         pollsize++;
226                 }
227
228                 if (!pollsize)
229                         break;
230
231                 if (poll(pfd, pollsize, -1) < 0) {
232                         if (errno != EINTR) {
233                                 error("poll failed, resuming: %s",
234                                       strerror(errno));
235                                 sleep(1);
236                         }
237                         continue;
238                 }
239                 if (0 <= pe && (pfd[pe].revents & (POLLIN|POLLHUP))) {
240                         /* Status ready; we ship that in the side-band
241                          * or dump to the standard error.
242                          */
243                         sz = xread(pack_objects.err, progress,
244                                   sizeof(progress));
245                         if (0 < sz)
246                                 send_client_data(2, progress, sz);
247                         else if (sz == 0) {
248                                 close(pack_objects.err);
249                                 pack_objects.err = -1;
250                         }
251                         else
252                                 goto fail;
253                         /* give priority to status messages */
254                         continue;
255                 }
256                 if (0 <= pu && (pfd[pu].revents & (POLLIN|POLLHUP))) {
257                         /* Data ready; we keep the last byte to ourselves
258                          * in case we detect broken rev-list, so that we
259                          * can leave the stream corrupted.  This is
260                          * unfortunate -- unpack-objects would happily
261                          * accept a valid packdata with trailing garbage,
262                          * so appending garbage after we pass all the
263                          * pack data is not good enough to signal
264                          * breakage to downstream.
265                          */
266                         char *cp = data;
267                         ssize_t outsz = 0;
268                         if (0 <= buffered) {
269                                 *cp++ = buffered;
270                                 outsz++;
271                         }
272                         sz = xread(pack_objects.out, cp,
273                                   sizeof(data) - outsz);
274                         if (0 < sz)
275                                 ;
276                         else if (sz == 0) {
277                                 close(pack_objects.out);
278                                 pack_objects.out = -1;
279                         }
280                         else
281                                 goto fail;
282                         sz += outsz;
283                         if (1 < sz) {
284                                 buffered = data[sz-1] & 0xFF;
285                                 sz--;
286                         }
287                         else
288                                 buffered = -1;
289                         sz = send_client_data(1, data, sz);
290                         if (sz < 0)
291                                 goto fail;
292                 }
293         }
294
295         if (finish_command(&pack_objects)) {
296                 error("git upload-pack: git-pack-objects died with error.");
297                 goto fail;
298         }
299         if (shallow_nr && finish_async(&rev_list))
300                 goto fail;      /* error was already reported */
301
302         /* flush the data */
303         if (0 <= buffered) {
304                 data[0] = buffered;
305                 sz = send_client_data(1, data, 1);
306                 if (sz < 0)
307                         goto fail;
308                 fprintf(stderr, "flushed.\n");
309         }
310         if (use_sideband)
311                 packet_flush(1);
312         return;
313
314  fail:
315         send_client_data(3, abort_msg, sizeof(abort_msg));
316         die("git upload-pack: %s", abort_msg);
317 }
318
319 static int got_sha1(char *hex, unsigned char *sha1)
320 {
321         struct object *o;
322         int we_knew_they_have = 0;
323
324         if (get_sha1_hex(hex, sha1))
325                 die("git upload-pack: expected SHA1 object, got '%s'", hex);
326         if (!has_sha1_file(sha1))
327                 return -1;
328
329         o = lookup_object(sha1);
330         if (!(o && o->parsed))
331                 o = parse_object(sha1);
332         if (!o)
333                 die("oops (%s)", sha1_to_hex(sha1));
334         if (o->type == OBJ_COMMIT) {
335                 struct commit_list *parents;
336                 struct commit *commit = (struct commit *)o;
337                 if (o->flags & THEY_HAVE)
338                         we_knew_they_have = 1;
339                 else
340                         o->flags |= THEY_HAVE;
341                 if (!oldest_have || (commit->date < oldest_have))
342                         oldest_have = commit->date;
343                 for (parents = commit->parents;
344                      parents;
345                      parents = parents->next)
346                         parents->item->object.flags |= THEY_HAVE;
347         }
348         if (!we_knew_they_have) {
349                 add_object_array(o, NULL, &have_obj);
350                 return 1;
351         }
352         return 0;
353 }
354
355 static int reachable(struct commit *want)
356 {
357         struct commit_list *work = NULL;
358
359         commit_list_insert_by_date(want, &work);
360         while (work) {
361                 struct commit_list *list = work->next;
362                 struct commit *commit = work->item;
363                 free(work);
364                 work = list;
365
366                 if (commit->object.flags & THEY_HAVE) {
367                         want->object.flags |= COMMON_KNOWN;
368                         break;
369                 }
370                 if (!commit->object.parsed)
371                         parse_object(commit->object.sha1);
372                 if (commit->object.flags & REACHABLE)
373                         continue;
374                 commit->object.flags |= REACHABLE;
375                 if (commit->date < oldest_have)
376                         continue;
377                 for (list = commit->parents; list; list = list->next) {
378                         struct commit *parent = list->item;
379                         if (!(parent->object.flags & REACHABLE))
380                                 commit_list_insert_by_date(parent, &work);
381                 }
382         }
383         want->object.flags |= REACHABLE;
384         clear_commit_marks(want, REACHABLE);
385         free_commit_list(work);
386         return (want->object.flags & COMMON_KNOWN);
387 }
388
389 static int ok_to_give_up(void)
390 {
391         int i;
392
393         if (!have_obj.nr)
394                 return 0;
395
396         for (i = 0; i < want_obj.nr; i++) {
397                 struct object *want = want_obj.objects[i].item;
398
399                 if (want->flags & COMMON_KNOWN)
400                         continue;
401                 want = deref_tag(want, "a want line", 0);
402                 if (!want || want->type != OBJ_COMMIT) {
403                         /* no way to tell if this is reachable by
404                          * looking at the ancestry chain alone, so
405                          * leave a note to ourselves not to worry about
406                          * this object anymore.
407                          */
408                         want_obj.objects[i].item->flags |= COMMON_KNOWN;
409                         continue;
410                 }
411                 if (!reachable((struct commit *)want))
412                         return 0;
413         }
414         return 1;
415 }
416
417 static int get_common_commits(void)
418 {
419         static char line[1000];
420         unsigned char sha1[20];
421         char last_hex[41];
422         int got_common = 0;
423         int got_other = 0;
424         int sent_ready = 0;
425
426         save_commit_buffer = 0;
427
428         for (;;) {
429                 int len = packet_read_line(0, line, sizeof(line));
430                 reset_timeout();
431
432                 if (!len) {
433                         if (multi_ack == 2 && got_common
434                             && !got_other && ok_to_give_up()) {
435                                 sent_ready = 1;
436                                 packet_write(1, "ACK %s ready\n", last_hex);
437                         }
438                         if (have_obj.nr == 0 || multi_ack)
439                                 packet_write(1, "NAK\n");
440
441                         if (no_done && sent_ready) {
442                                 packet_write(1, "ACK %s\n", last_hex);
443                                 return 0;
444                         }
445                         if (stateless_rpc)
446                                 exit(0);
447                         got_common = 0;
448                         got_other = 0;
449                         continue;
450                 }
451                 strip(line, len);
452                 if (!prefixcmp(line, "have ")) {
453                         switch (got_sha1(line+5, sha1)) {
454                         case -1: /* they have what we do not */
455                                 got_other = 1;
456                                 if (multi_ack && ok_to_give_up()) {
457                                         const char *hex = sha1_to_hex(sha1);
458                                         if (multi_ack == 2) {
459                                                 sent_ready = 1;
460                                                 packet_write(1, "ACK %s ready\n", hex);
461                                         } else
462                                                 packet_write(1, "ACK %s continue\n", hex);
463                                 }
464                                 break;
465                         default:
466                                 got_common = 1;
467                                 memcpy(last_hex, sha1_to_hex(sha1), 41);
468                                 if (multi_ack == 2)
469                                         packet_write(1, "ACK %s common\n", last_hex);
470                                 else if (multi_ack)
471                                         packet_write(1, "ACK %s continue\n", last_hex);
472                                 else if (have_obj.nr == 1)
473                                         packet_write(1, "ACK %s\n", last_hex);
474                                 break;
475                         }
476                         continue;
477                 }
478                 if (!strcmp(line, "done")) {
479                         if (have_obj.nr > 0) {
480                                 if (multi_ack)
481                                         packet_write(1, "ACK %s\n", last_hex);
482                                 return 0;
483                         }
484                         packet_write(1, "NAK\n");
485                         return -1;
486                 }
487                 die("git upload-pack: expected SHA1 list, got '%s'", line);
488         }
489 }
490
491 static void check_non_tip(void)
492 {
493         static const char *argv[] = {
494                 "rev-list", "--stdin", NULL,
495         };
496         static struct child_process cmd;
497         struct object *o;
498         char namebuf[42]; /* ^ + SHA-1 + LF */
499         int i;
500
501         /* In the normal in-process case non-tip request can never happen */
502         if (!stateless_rpc)
503                 goto error;
504
505         cmd.argv = argv;
506         cmd.git_cmd = 1;
507         cmd.no_stderr = 1;
508         cmd.in = -1;
509         cmd.out = -1;
510
511         if (start_command(&cmd))
512                 goto error;
513
514         /*
515          * If rev-list --stdin encounters an unknown commit, it
516          * terminates, which will cause SIGPIPE in the write loop
517          * below.
518          */
519         sigchain_push(SIGPIPE, SIG_IGN);
520
521         namebuf[0] = '^';
522         namebuf[41] = '\n';
523         for (i = get_max_object_index(); 0 < i; ) {
524                 o = get_indexed_object(--i);
525                 if (!o)
526                         continue;
527                 if (!(o->flags & OUR_REF))
528                         continue;
529                 memcpy(namebuf + 1, sha1_to_hex(o->sha1), 40);
530                 if (write_in_full(cmd.in, namebuf, 42) < 0)
531                         goto error;
532         }
533         namebuf[40] = '\n';
534         for (i = 0; i < want_obj.nr; i++) {
535                 o = want_obj.objects[i].item;
536                 if (o->flags & OUR_REF)
537                         continue;
538                 memcpy(namebuf, sha1_to_hex(o->sha1), 40);
539                 if (write_in_full(cmd.in, namebuf, 41) < 0)
540                         goto error;
541         }
542         close(cmd.in);
543
544         sigchain_pop(SIGPIPE);
545
546         /*
547          * The commits out of the rev-list are not ancestors of
548          * our ref.
549          */
550         i = read_in_full(cmd.out, namebuf, 1);
551         if (i)
552                 goto error;
553         close(cmd.out);
554
555         /*
556          * rev-list may have died by encountering a bad commit
557          * in the history, in which case we do want to bail out
558          * even when it showed no commit.
559          */
560         if (finish_command(&cmd))
561                 goto error;
562
563         /* All the non-tip ones are ancestors of what we advertised */
564         return;
565
566 error:
567         /* Pick one of them (we know there at least is one) */
568         for (i = 0; i < want_obj.nr; i++) {
569                 o = want_obj.objects[i].item;
570                 if (!(o->flags & OUR_REF))
571                         die("git upload-pack: not our ref %s",
572                             sha1_to_hex(o->sha1));
573         }
574 }
575
576 static void receive_needs(void)
577 {
578         struct object_array shallows = OBJECT_ARRAY_INIT;
579         static char line[1000];
580         int len, depth = 0;
581         int has_non_tip = 0;
582
583         shallow_nr = 0;
584         if (debug_fd)
585                 write_str_in_full(debug_fd, "#S\n");
586         for (;;) {
587                 struct object *o;
588                 unsigned char sha1_buf[20];
589                 len = packet_read_line(0, line, sizeof(line));
590                 reset_timeout();
591                 if (!len)
592                         break;
593                 if (debug_fd)
594                         write_in_full(debug_fd, line, len);
595
596                 if (!prefixcmp(line, "shallow ")) {
597                         unsigned char sha1[20];
598                         struct object *object;
599                         if (get_sha1(line + 8, sha1))
600                                 die("invalid shallow line: %s", line);
601                         object = parse_object(sha1);
602                         if (!object)
603                                 die("did not find object for %s", line);
604                         object->flags |= CLIENT_SHALLOW;
605                         add_object_array(object, NULL, &shallows);
606                         continue;
607                 }
608                 if (!prefixcmp(line, "deepen ")) {
609                         char *end;
610                         depth = strtol(line + 7, &end, 0);
611                         if (end == line + 7 || depth <= 0)
612                                 die("Invalid deepen: %s", line);
613                         continue;
614                 }
615                 if (prefixcmp(line, "want ") ||
616                     get_sha1_hex(line+5, sha1_buf))
617                         die("git upload-pack: protocol error, "
618                             "expected to get sha, not '%s'", line);
619                 if (strstr(line+45, "multi_ack_detailed"))
620                         multi_ack = 2;
621                 else if (strstr(line+45, "multi_ack"))
622                         multi_ack = 1;
623                 if (strstr(line+45, "no-done"))
624                         no_done = 1;
625                 if (strstr(line+45, "thin-pack"))
626                         use_thin_pack = 1;
627                 if (strstr(line+45, "ofs-delta"))
628                         use_ofs_delta = 1;
629                 if (strstr(line+45, "side-band-64k"))
630                         use_sideband = LARGE_PACKET_MAX;
631                 else if (strstr(line+45, "side-band"))
632                         use_sideband = DEFAULT_PACKET_MAX;
633                 if (strstr(line+45, "no-progress"))
634                         no_progress = 1;
635                 if (strstr(line+45, "include-tag"))
636                         use_include_tag = 1;
637
638                 o = lookup_object(sha1_buf);
639                 if (!o)
640                         die("git upload-pack: not our ref %s",
641                             sha1_to_hex(sha1_buf));
642                 if (!(o->flags & WANTED)) {
643                         o->flags |= WANTED;
644                         if (!(o->flags & OUR_REF))
645                                 has_non_tip = 1;
646                         add_object_array(o, NULL, &want_obj);
647                 }
648         }
649         if (debug_fd)
650                 write_str_in_full(debug_fd, "#E\n");
651
652         /*
653          * We have sent all our refs already, and the other end
654          * should have chosen out of them. When we are operating
655          * in the stateless RPC mode, however, their choice may
656          * have been based on the set of older refs advertised
657          * by another process that handled the initial request.
658          */
659         if (has_non_tip)
660                 check_non_tip();
661
662         if (!use_sideband && daemon_mode)
663                 no_progress = 1;
664
665         if (depth == 0 && shallows.nr == 0)
666                 return;
667         if (depth > 0) {
668                 struct commit_list *result, *backup;
669                 int i;
670                 backup = result = get_shallow_commits(&want_obj, depth,
671                         SHALLOW, NOT_SHALLOW);
672                 while (result) {
673                         struct object *object = &result->item->object;
674                         if (!(object->flags & (CLIENT_SHALLOW|NOT_SHALLOW))) {
675                                 packet_write(1, "shallow %s",
676                                                 sha1_to_hex(object->sha1));
677                                 register_shallow(object->sha1);
678                                 shallow_nr++;
679                         }
680                         result = result->next;
681                 }
682                 free_commit_list(backup);
683                 for (i = 0; i < shallows.nr; i++) {
684                         struct object *object = shallows.objects[i].item;
685                         if (object->flags & NOT_SHALLOW) {
686                                 struct commit_list *parents;
687                                 packet_write(1, "unshallow %s",
688                                         sha1_to_hex(object->sha1));
689                                 object->flags &= ~CLIENT_SHALLOW;
690                                 /* make sure the real parents are parsed */
691                                 unregister_shallow(object->sha1);
692                                 object->parsed = 0;
693                                 if (parse_commit((struct commit *)object))
694                                         die("invalid commit");
695                                 parents = ((struct commit *)object)->parents;
696                                 while (parents) {
697                                         add_object_array(&parents->item->object,
698                                                         NULL, &want_obj);
699                                         parents = parents->next;
700                                 }
701                                 add_object_array(object, NULL, &extra_edge_obj);
702                         }
703                         /* make sure commit traversal conforms to client */
704                         register_shallow(object->sha1);
705                 }
706                 packet_flush(1);
707         } else
708                 if (shallows.nr > 0) {
709                         int i;
710                         for (i = 0; i < shallows.nr; i++)
711                                 register_shallow(shallows.objects[i].item->sha1);
712                 }
713
714         shallow_nr += shallows.nr;
715         free(shallows.objects);
716 }
717
718 static int send_ref(const char *refname, const unsigned char *sha1, int flag, void *cb_data)
719 {
720         static const char *capabilities = "multi_ack thin-pack side-band"
721                 " side-band-64k ofs-delta shallow no-progress"
722                 " include-tag multi_ack_detailed";
723         struct object *o = parse_object(sha1);
724         const char *refname_nons = strip_namespace(refname);
725
726         if (!o)
727                 die("git upload-pack: cannot find object %s:", sha1_to_hex(sha1));
728
729         if (capabilities)
730                 packet_write(1, "%s %s%c%s%s\n", sha1_to_hex(sha1), refname_nons,
731                              0, capabilities,
732                              stateless_rpc ? " no-done" : "");
733         else
734                 packet_write(1, "%s %s\n", sha1_to_hex(sha1), refname_nons);
735         capabilities = NULL;
736         if (!(o->flags & OUR_REF)) {
737                 o->flags |= OUR_REF;
738                 nr_our_refs++;
739         }
740         if (o->type == OBJ_TAG) {
741                 o = deref_tag(o, refname, 0);
742                 if (o)
743                         packet_write(1, "%s %s^{}\n", sha1_to_hex(o->sha1), refname_nons);
744         }
745         return 0;
746 }
747
748 static int mark_our_ref(const char *refname, const unsigned char *sha1, int flag, void *cb_data)
749 {
750         struct object *o = parse_object(sha1);
751         if (!o)
752                 die("git upload-pack: cannot find object %s:", sha1_to_hex(sha1));
753         if (!(o->flags & OUR_REF)) {
754                 o->flags |= OUR_REF;
755                 nr_our_refs++;
756         }
757         return 0;
758 }
759
760 static void upload_pack(void)
761 {
762         if (advertise_refs || !stateless_rpc) {
763                 reset_timeout();
764                 head_ref_namespaced(send_ref, NULL);
765                 for_each_namespaced_ref(send_ref, NULL);
766                 packet_flush(1);
767         } else {
768                 head_ref_namespaced(mark_our_ref, NULL);
769                 for_each_namespaced_ref(mark_our_ref, NULL);
770         }
771         if (advertise_refs)
772                 return;
773
774         receive_needs();
775         if (want_obj.nr) {
776                 get_common_commits();
777                 create_pack_file();
778         }
779 }
780
781 int main(int argc, char **argv)
782 {
783         char *dir;
784         int i;
785         int strict = 0;
786
787         packet_trace_identity("upload-pack");
788         git_extract_argv0_path(argv[0]);
789         read_replace_refs = 0;
790
791         for (i = 1; i < argc; i++) {
792                 char *arg = argv[i];
793
794                 if (arg[0] != '-')
795                         break;
796                 if (!strcmp(arg, "--advertise-refs")) {
797                         advertise_refs = 1;
798                         continue;
799                 }
800                 if (!strcmp(arg, "--stateless-rpc")) {
801                         stateless_rpc = 1;
802                         continue;
803                 }
804                 if (!strcmp(arg, "--strict")) {
805                         strict = 1;
806                         continue;
807                 }
808                 if (!prefixcmp(arg, "--timeout=")) {
809                         timeout = atoi(arg+10);
810                         daemon_mode = 1;
811                         continue;
812                 }
813                 if (!strcmp(arg, "--")) {
814                         i++;
815                         break;
816                 }
817         }
818
819         if (i != argc-1)
820                 usage(upload_pack_usage);
821
822         setup_path();
823
824         dir = argv[i];
825
826         if (!enter_repo(dir, strict))
827                 die("'%s' does not appear to be a git repository", dir);
828         if (is_repository_shallow())
829                 die("attempt to fetch/clone from a shallow repository");
830         if (getenv("GIT_DEBUG_SEND_PACK"))
831                 debug_fd = atoi(getenv("GIT_DEBUG_SEND_PACK"));
832         upload_pack();
833         return 0;
834 }