Merge branch 'jc/maint-ident-missing-human-name'
[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 #include "version.h"
15
16 static const char upload_pack_usage[] = "git upload-pack [--strict] [--timeout=<n>] <dir>";
17
18 /* bits #0..7 in revision.h, #8..10 in commit.c */
19 #define THEY_HAVE       (1u << 11)
20 #define OUR_REF         (1u << 12)
21 #define WANTED          (1u << 13)
22 #define COMMON_KNOWN    (1u << 14)
23 #define REACHABLE       (1u << 15)
24
25 #define SHALLOW         (1u << 16)
26 #define NOT_SHALLOW     (1u << 17)
27 #define CLIENT_SHALLOW  (1u << 18)
28
29 static unsigned long oldest_have;
30
31 static int multi_ack, nr_our_refs;
32 static int no_done;
33 static int use_thin_pack, use_ofs_delta, use_include_tag;
34 static int no_progress, daemon_mode;
35 static int shallow_nr;
36 static struct object_array have_obj;
37 static struct object_array want_obj;
38 static struct object_array extra_edge_obj;
39 static unsigned int timeout;
40 /* 0 for no sideband,
41  * otherwise maximum packet size (up to 65520 bytes).
42  */
43 static int use_sideband;
44 static int debug_fd;
45 static int advertise_refs;
46 static int stateless_rpc;
47
48 static void reset_timeout(void)
49 {
50         alarm(timeout);
51 }
52
53 static int strip(char *line, int len)
54 {
55         if (len && line[len-1] == '\n')
56                 line[--len] = 0;
57         return len;
58 }
59
60 static ssize_t send_client_data(int fd, const char *data, ssize_t sz)
61 {
62         if (use_sideband)
63                 return send_sideband(1, fd, data, sz, use_sideband);
64         if (fd == 3)
65                 /* emergency quit */
66                 fd = 2;
67         if (fd == 2) {
68                 /* XXX: are we happy to lose stuff here? */
69                 xwrite(fd, data, sz);
70                 return sz;
71         }
72         return safe_write(fd, data, sz);
73 }
74
75 static FILE *pack_pipe = NULL;
76 static void show_commit(struct commit *commit, void *data)
77 {
78         if (commit->object.flags & BOUNDARY)
79                 fputc('-', pack_pipe);
80         if (fputs(sha1_to_hex(commit->object.sha1), pack_pipe) < 0)
81                 die("broken output pipe");
82         fputc('\n', pack_pipe);
83         fflush(pack_pipe);
84         free(commit->buffer);
85         commit->buffer = NULL;
86 }
87
88 static void show_object(struct object *obj,
89                         const struct name_path *path, const char *component,
90                         void *cb_data)
91 {
92         show_object_with_name(pack_pipe, obj, path, component);
93 }
94
95 static void show_edge(struct commit *commit)
96 {
97         fprintf(pack_pipe, "-%s\n", sha1_to_hex(commit->object.sha1));
98 }
99
100 static int do_rev_list(int in, int out, void *user_data)
101 {
102         int i;
103         struct rev_info revs;
104
105         pack_pipe = xfdopen(out, "w");
106         init_revisions(&revs, NULL);
107         revs.tag_objects = 1;
108         revs.tree_objects = 1;
109         revs.blob_objects = 1;
110         if (use_thin_pack)
111                 revs.edge_hint = 1;
112
113         for (i = 0; i < want_obj.nr; i++) {
114                 struct object *o = want_obj.objects[i].item;
115                 /* why??? */
116                 o->flags &= ~UNINTERESTING;
117                 add_pending_object(&revs, o, NULL);
118         }
119         for (i = 0; i < have_obj.nr; i++) {
120                 struct object *o = have_obj.objects[i].item;
121                 o->flags |= UNINTERESTING;
122                 add_pending_object(&revs, o, NULL);
123         }
124         setup_revisions(0, NULL, &revs, NULL);
125         if (prepare_revision_walk(&revs))
126                 die("revision walk setup failed");
127         mark_edges_uninteresting(revs.commits, &revs, show_edge);
128         if (use_thin_pack)
129                 for (i = 0; i < extra_edge_obj.nr; i++)
130                         fprintf(pack_pipe, "-%s\n", sha1_to_hex(
131                                         extra_edge_obj.objects[i].item->sha1));
132         traverse_commit_list(&revs, show_commit, show_object, NULL);
133         fflush(pack_pipe);
134         fclose(pack_pipe);
135         return 0;
136 }
137
138 static void create_pack_file(void)
139 {
140         struct async rev_list;
141         struct child_process pack_objects;
142         int create_full_pack = (nr_our_refs == want_obj.nr && !have_obj.nr);
143         char data[8193], progress[128];
144         char abort_msg[] = "aborting due to possible repository "
145                 "corruption on the remote side.";
146         int buffered = -1;
147         ssize_t sz;
148         const char *argv[10];
149         int arg = 0;
150
151         argv[arg++] = "pack-objects";
152         if (!shallow_nr) {
153                 argv[arg++] = "--revs";
154                 if (create_full_pack)
155                         argv[arg++] = "--all";
156                 else if (use_thin_pack)
157                         argv[arg++] = "--thin";
158         }
159
160         argv[arg++] = "--stdout";
161         if (!no_progress)
162                 argv[arg++] = "--progress";
163         if (use_ofs_delta)
164                 argv[arg++] = "--delta-base-offset";
165         if (use_include_tag)
166                 argv[arg++] = "--include-tag";
167         argv[arg++] = NULL;
168
169         memset(&pack_objects, 0, sizeof(pack_objects));
170         pack_objects.in = -1;
171         pack_objects.out = -1;
172         pack_objects.err = -1;
173         pack_objects.git_cmd = 1;
174         pack_objects.argv = argv;
175
176         if (start_command(&pack_objects))
177                 die("git upload-pack: unable to fork git-pack-objects");
178
179         if (shallow_nr) {
180                 memset(&rev_list, 0, sizeof(rev_list));
181                 rev_list.proc = do_rev_list;
182                 rev_list.out = pack_objects.in;
183                 if (start_async(&rev_list))
184                         die("git upload-pack: unable to fork git-rev-list");
185         }
186         else {
187                 FILE *pipe_fd = xfdopen(pack_objects.in, "w");
188                 if (!create_full_pack) {
189                         int i;
190                         for (i = 0; i < want_obj.nr; i++)
191                                 fprintf(pipe_fd, "%s\n", sha1_to_hex(want_obj.objects[i].item->sha1));
192                         fprintf(pipe_fd, "--not\n");
193                         for (i = 0; i < have_obj.nr; i++)
194                                 fprintf(pipe_fd, "%s\n", sha1_to_hex(have_obj.objects[i].item->sha1));
195                 }
196
197                 fprintf(pipe_fd, "\n");
198                 fflush(pipe_fd);
199                 fclose(pipe_fd);
200         }
201
202
203         /* We read from pack_objects.err to capture stderr output for
204          * progress bar, and pack_objects.out to capture the pack data.
205          */
206
207         while (1) {
208                 struct pollfd pfd[2];
209                 int pe, pu, pollsize;
210
211                 reset_timeout();
212
213                 pollsize = 0;
214                 pe = pu = -1;
215
216                 if (0 <= pack_objects.out) {
217                         pfd[pollsize].fd = pack_objects.out;
218                         pfd[pollsize].events = POLLIN;
219                         pu = pollsize;
220                         pollsize++;
221                 }
222                 if (0 <= pack_objects.err) {
223                         pfd[pollsize].fd = pack_objects.err;
224                         pfd[pollsize].events = POLLIN;
225                         pe = pollsize;
226                         pollsize++;
227                 }
228
229                 if (!pollsize)
230                         break;
231
232                 if (poll(pfd, pollsize, -1) < 0) {
233                         if (errno != EINTR) {
234                                 error("poll failed, resuming: %s",
235                                       strerror(errno));
236                                 sleep(1);
237                         }
238                         continue;
239                 }
240                 if (0 <= pe && (pfd[pe].revents & (POLLIN|POLLHUP))) {
241                         /* Status ready; we ship that in the side-band
242                          * or dump to the standard error.
243                          */
244                         sz = xread(pack_objects.err, progress,
245                                   sizeof(progress));
246                         if (0 < sz)
247                                 send_client_data(2, progress, sz);
248                         else if (sz == 0) {
249                                 close(pack_objects.err);
250                                 pack_objects.err = -1;
251                         }
252                         else
253                                 goto fail;
254                         /* give priority to status messages */
255                         continue;
256                 }
257                 if (0 <= pu && (pfd[pu].revents & (POLLIN|POLLHUP))) {
258                         /* Data ready; we keep the last byte to ourselves
259                          * in case we detect broken rev-list, so that we
260                          * can leave the stream corrupted.  This is
261                          * unfortunate -- unpack-objects would happily
262                          * accept a valid packdata with trailing garbage,
263                          * so appending garbage after we pass all the
264                          * pack data is not good enough to signal
265                          * breakage to downstream.
266                          */
267                         char *cp = data;
268                         ssize_t outsz = 0;
269                         if (0 <= buffered) {
270                                 *cp++ = buffered;
271                                 outsz++;
272                         }
273                         sz = xread(pack_objects.out, cp,
274                                   sizeof(data) - outsz);
275                         if (0 < sz)
276                                 ;
277                         else if (sz == 0) {
278                                 close(pack_objects.out);
279                                 pack_objects.out = -1;
280                         }
281                         else
282                                 goto fail;
283                         sz += outsz;
284                         if (1 < sz) {
285                                 buffered = data[sz-1] & 0xFF;
286                                 sz--;
287                         }
288                         else
289                                 buffered = -1;
290                         sz = send_client_data(1, data, sz);
291                         if (sz < 0)
292                                 goto fail;
293                 }
294         }
295
296         if (finish_command(&pack_objects)) {
297                 error("git upload-pack: git-pack-objects died with error.");
298                 goto fail;
299         }
300         if (shallow_nr && finish_async(&rev_list))
301                 goto fail;      /* error was already reported */
302
303         /* flush the data */
304         if (0 <= buffered) {
305                 data[0] = buffered;
306                 sz = send_client_data(1, data, 1);
307                 if (sz < 0)
308                         goto fail;
309                 fprintf(stderr, "flushed.\n");
310         }
311         if (use_sideband)
312                 packet_flush(1);
313         return;
314
315  fail:
316         send_client_data(3, abort_msg, sizeof(abort_msg));
317         die("git upload-pack: %s", abort_msg);
318 }
319
320 static int got_sha1(char *hex, unsigned char *sha1)
321 {
322         struct object *o;
323         int we_knew_they_have = 0;
324
325         if (get_sha1_hex(hex, sha1))
326                 die("git upload-pack: expected SHA1 object, got '%s'", hex);
327         if (!has_sha1_file(sha1))
328                 return -1;
329
330         o = lookup_object(sha1);
331         if (!(o && o->parsed))
332                 o = parse_object(sha1);
333         if (!o)
334                 die("oops (%s)", sha1_to_hex(sha1));
335         if (o->type == OBJ_COMMIT) {
336                 struct commit_list *parents;
337                 struct commit *commit = (struct commit *)o;
338                 if (o->flags & THEY_HAVE)
339                         we_knew_they_have = 1;
340                 else
341                         o->flags |= THEY_HAVE;
342                 if (!oldest_have || (commit->date < oldest_have))
343                         oldest_have = commit->date;
344                 for (parents = commit->parents;
345                      parents;
346                      parents = parents->next)
347                         parents->item->object.flags |= THEY_HAVE;
348         }
349         if (!we_knew_they_have) {
350                 add_object_array(o, NULL, &have_obj);
351                 return 1;
352         }
353         return 0;
354 }
355
356 static int reachable(struct commit *want)
357 {
358         struct commit_list *work = NULL;
359
360         commit_list_insert_by_date(want, &work);
361         while (work) {
362                 struct commit_list *list = work->next;
363                 struct commit *commit = work->item;
364                 free(work);
365                 work = list;
366
367                 if (commit->object.flags & THEY_HAVE) {
368                         want->object.flags |= COMMON_KNOWN;
369                         break;
370                 }
371                 if (!commit->object.parsed)
372                         parse_object(commit->object.sha1);
373                 if (commit->object.flags & REACHABLE)
374                         continue;
375                 commit->object.flags |= REACHABLE;
376                 if (commit->date < oldest_have)
377                         continue;
378                 for (list = commit->parents; list; list = list->next) {
379                         struct commit *parent = list->item;
380                         if (!(parent->object.flags & REACHABLE))
381                                 commit_list_insert_by_date(parent, &work);
382                 }
383         }
384         want->object.flags |= REACHABLE;
385         clear_commit_marks(want, REACHABLE);
386         free_commit_list(work);
387         return (want->object.flags & COMMON_KNOWN);
388 }
389
390 static int ok_to_give_up(void)
391 {
392         int i;
393
394         if (!have_obj.nr)
395                 return 0;
396
397         for (i = 0; i < want_obj.nr; i++) {
398                 struct object *want = want_obj.objects[i].item;
399
400                 if (want->flags & COMMON_KNOWN)
401                         continue;
402                 want = deref_tag(want, "a want line", 0);
403                 if (!want || want->type != OBJ_COMMIT) {
404                         /* no way to tell if this is reachable by
405                          * looking at the ancestry chain alone, so
406                          * leave a note to ourselves not to worry about
407                          * this object anymore.
408                          */
409                         want_obj.objects[i].item->flags |= COMMON_KNOWN;
410                         continue;
411                 }
412                 if (!reachable((struct commit *)want))
413                         return 0;
414         }
415         return 1;
416 }
417
418 static int get_common_commits(void)
419 {
420         static char line[1000];
421         unsigned char sha1[20];
422         char last_hex[41];
423         int got_common = 0;
424         int got_other = 0;
425         int sent_ready = 0;
426
427         save_commit_buffer = 0;
428
429         for (;;) {
430                 int len = packet_read_line(0, line, sizeof(line));
431                 reset_timeout();
432
433                 if (!len) {
434                         if (multi_ack == 2 && got_common
435                             && !got_other && ok_to_give_up()) {
436                                 sent_ready = 1;
437                                 packet_write(1, "ACK %s ready\n", last_hex);
438                         }
439                         if (have_obj.nr == 0 || multi_ack)
440                                 packet_write(1, "NAK\n");
441
442                         if (no_done && sent_ready) {
443                                 packet_write(1, "ACK %s\n", last_hex);
444                                 return 0;
445                         }
446                         if (stateless_rpc)
447                                 exit(0);
448                         got_common = 0;
449                         got_other = 0;
450                         continue;
451                 }
452                 strip(line, len);
453                 if (!prefixcmp(line, "have ")) {
454                         switch (got_sha1(line+5, sha1)) {
455                         case -1: /* they have what we do not */
456                                 got_other = 1;
457                                 if (multi_ack && ok_to_give_up()) {
458                                         const char *hex = sha1_to_hex(sha1);
459                                         if (multi_ack == 2) {
460                                                 sent_ready = 1;
461                                                 packet_write(1, "ACK %s ready\n", hex);
462                                         } else
463                                                 packet_write(1, "ACK %s continue\n", hex);
464                                 }
465                                 break;
466                         default:
467                                 got_common = 1;
468                                 memcpy(last_hex, sha1_to_hex(sha1), 41);
469                                 if (multi_ack == 2)
470                                         packet_write(1, "ACK %s common\n", last_hex);
471                                 else if (multi_ack)
472                                         packet_write(1, "ACK %s continue\n", last_hex);
473                                 else if (have_obj.nr == 1)
474                                         packet_write(1, "ACK %s\n", last_hex);
475                                 break;
476                         }
477                         continue;
478                 }
479                 if (!strcmp(line, "done")) {
480                         if (have_obj.nr > 0) {
481                                 if (multi_ack)
482                                         packet_write(1, "ACK %s\n", last_hex);
483                                 return 0;
484                         }
485                         packet_write(1, "NAK\n");
486                         return -1;
487                 }
488                 die("git upload-pack: expected SHA1 list, got '%s'", line);
489         }
490 }
491
492 static void check_non_tip(void)
493 {
494         static const char *argv[] = {
495                 "rev-list", "--stdin", NULL,
496         };
497         static struct child_process cmd;
498         struct object *o;
499         char namebuf[42]; /* ^ + SHA-1 + LF */
500         int i;
501
502         /* In the normal in-process case non-tip request can never happen */
503         if (!stateless_rpc)
504                 goto error;
505
506         cmd.argv = argv;
507         cmd.git_cmd = 1;
508         cmd.no_stderr = 1;
509         cmd.in = -1;
510         cmd.out = -1;
511
512         if (start_command(&cmd))
513                 goto error;
514
515         /*
516          * If rev-list --stdin encounters an unknown commit, it
517          * terminates, which will cause SIGPIPE in the write loop
518          * below.
519          */
520         sigchain_push(SIGPIPE, SIG_IGN);
521
522         namebuf[0] = '^';
523         namebuf[41] = '\n';
524         for (i = get_max_object_index(); 0 < i; ) {
525                 o = get_indexed_object(--i);
526                 if (!o)
527                         continue;
528                 if (!(o->flags & OUR_REF))
529                         continue;
530                 memcpy(namebuf + 1, sha1_to_hex(o->sha1), 40);
531                 if (write_in_full(cmd.in, namebuf, 42) < 0)
532                         goto error;
533         }
534         namebuf[40] = '\n';
535         for (i = 0; i < want_obj.nr; i++) {
536                 o = want_obj.objects[i].item;
537                 if (o->flags & OUR_REF)
538                         continue;
539                 memcpy(namebuf, sha1_to_hex(o->sha1), 40);
540                 if (write_in_full(cmd.in, namebuf, 41) < 0)
541                         goto error;
542         }
543         close(cmd.in);
544
545         sigchain_pop(SIGPIPE);
546
547         /*
548          * The commits out of the rev-list are not ancestors of
549          * our ref.
550          */
551         i = read_in_full(cmd.out, namebuf, 1);
552         if (i)
553                 goto error;
554         close(cmd.out);
555
556         /*
557          * rev-list may have died by encountering a bad commit
558          * in the history, in which case we do want to bail out
559          * even when it showed no commit.
560          */
561         if (finish_command(&cmd))
562                 goto error;
563
564         /* All the non-tip ones are ancestors of what we advertised */
565         return;
566
567 error:
568         /* Pick one of them (we know there at least is one) */
569         for (i = 0; i < want_obj.nr; i++) {
570                 o = want_obj.objects[i].item;
571                 if (!(o->flags & OUR_REF))
572                         die("git upload-pack: not our ref %s",
573                             sha1_to_hex(o->sha1));
574         }
575 }
576
577 static void receive_needs(void)
578 {
579         struct object_array shallows = OBJECT_ARRAY_INIT;
580         static char line[1000];
581         int len, depth = 0;
582         int has_non_tip = 0;
583
584         shallow_nr = 0;
585         if (debug_fd)
586                 write_str_in_full(debug_fd, "#S\n");
587         for (;;) {
588                 struct object *o;
589                 const char *features;
590                 unsigned char sha1_buf[20];
591                 len = packet_read_line(0, line, sizeof(line));
592                 reset_timeout();
593                 if (!len)
594                         break;
595                 if (debug_fd)
596                         write_in_full(debug_fd, line, len);
597
598                 if (!prefixcmp(line, "shallow ")) {
599                         unsigned char sha1[20];
600                         struct object *object;
601                         if (get_sha1(line + 8, sha1))
602                                 die("invalid shallow line: %s", line);
603                         object = parse_object(sha1);
604                         if (!object)
605                                 die("did not find object for %s", line);
606                         object->flags |= CLIENT_SHALLOW;
607                         add_object_array(object, NULL, &shallows);
608                         continue;
609                 }
610                 if (!prefixcmp(line, "deepen ")) {
611                         char *end;
612                         depth = strtol(line + 7, &end, 0);
613                         if (end == line + 7 || depth <= 0)
614                                 die("Invalid deepen: %s", line);
615                         continue;
616                 }
617                 if (prefixcmp(line, "want ") ||
618                     get_sha1_hex(line+5, sha1_buf))
619                         die("git upload-pack: protocol error, "
620                             "expected to get sha, not '%s'", line);
621
622                 features = line + 45;
623
624                 if (parse_feature_request(features, "multi_ack_detailed"))
625                         multi_ack = 2;
626                 else if (parse_feature_request(features, "multi_ack"))
627                         multi_ack = 1;
628                 if (parse_feature_request(features, "no-done"))
629                         no_done = 1;
630                 if (parse_feature_request(features, "thin-pack"))
631                         use_thin_pack = 1;
632                 if (parse_feature_request(features, "ofs-delta"))
633                         use_ofs_delta = 1;
634                 if (parse_feature_request(features, "side-band-64k"))
635                         use_sideband = LARGE_PACKET_MAX;
636                 else if (parse_feature_request(features, "side-band"))
637                         use_sideband = DEFAULT_PACKET_MAX;
638                 if (parse_feature_request(features, "no-progress"))
639                         no_progress = 1;
640                 if (parse_feature_request(features, "include-tag"))
641                         use_include_tag = 1;
642
643                 o = lookup_object(sha1_buf);
644                 if (!o)
645                         die("git upload-pack: not our ref %s",
646                             sha1_to_hex(sha1_buf));
647                 if (!(o->flags & WANTED)) {
648                         o->flags |= WANTED;
649                         if (!(o->flags & OUR_REF))
650                                 has_non_tip = 1;
651                         add_object_array(o, NULL, &want_obj);
652                 }
653         }
654         if (debug_fd)
655                 write_str_in_full(debug_fd, "#E\n");
656
657         /*
658          * We have sent all our refs already, and the other end
659          * should have chosen out of them. When we are operating
660          * in the stateless RPC mode, however, their choice may
661          * have been based on the set of older refs advertised
662          * by another process that handled the initial request.
663          */
664         if (has_non_tip)
665                 check_non_tip();
666
667         if (!use_sideband && daemon_mode)
668                 no_progress = 1;
669
670         if (depth == 0 && shallows.nr == 0)
671                 return;
672         if (depth > 0) {
673                 struct commit_list *result, *backup;
674                 int i;
675                 backup = result = get_shallow_commits(&want_obj, depth,
676                         SHALLOW, NOT_SHALLOW);
677                 while (result) {
678                         struct object *object = &result->item->object;
679                         if (!(object->flags & (CLIENT_SHALLOW|NOT_SHALLOW))) {
680                                 packet_write(1, "shallow %s",
681                                                 sha1_to_hex(object->sha1));
682                                 register_shallow(object->sha1);
683                                 shallow_nr++;
684                         }
685                         result = result->next;
686                 }
687                 free_commit_list(backup);
688                 for (i = 0; i < shallows.nr; i++) {
689                         struct object *object = shallows.objects[i].item;
690                         if (object->flags & NOT_SHALLOW) {
691                                 struct commit_list *parents;
692                                 packet_write(1, "unshallow %s",
693                                         sha1_to_hex(object->sha1));
694                                 object->flags &= ~CLIENT_SHALLOW;
695                                 /* make sure the real parents are parsed */
696                                 unregister_shallow(object->sha1);
697                                 object->parsed = 0;
698                                 if (parse_commit((struct commit *)object))
699                                         die("invalid commit");
700                                 parents = ((struct commit *)object)->parents;
701                                 while (parents) {
702                                         add_object_array(&parents->item->object,
703                                                         NULL, &want_obj);
704                                         parents = parents->next;
705                                 }
706                                 add_object_array(object, NULL, &extra_edge_obj);
707                         }
708                         /* make sure commit traversal conforms to client */
709                         register_shallow(object->sha1);
710                 }
711                 packet_flush(1);
712         } else
713                 if (shallows.nr > 0) {
714                         int i;
715                         for (i = 0; i < shallows.nr; i++)
716                                 register_shallow(shallows.objects[i].item->sha1);
717                 }
718
719         shallow_nr += shallows.nr;
720         free(shallows.objects);
721 }
722
723 static int send_ref(const char *refname, const unsigned char *sha1, int flag, void *cb_data)
724 {
725         static const char *capabilities = "multi_ack thin-pack side-band"
726                 " side-band-64k ofs-delta shallow no-progress"
727                 " include-tag multi_ack_detailed";
728         struct object *o = lookup_unknown_object(sha1);
729         const char *refname_nons = strip_namespace(refname);
730
731         if (o->type == OBJ_NONE) {
732                 o->type = sha1_object_info(sha1, NULL);
733                 if (o->type < 0)
734                     die("git upload-pack: cannot find object %s:", sha1_to_hex(sha1));
735         }
736
737         if (capabilities)
738                 packet_write(1, "%s %s%c%s%s agent=%s\n",
739                              sha1_to_hex(sha1), refname_nons,
740                              0, capabilities,
741                              stateless_rpc ? " no-done" : "",
742                              git_user_agent_sanitized());
743         else
744                 packet_write(1, "%s %s\n", sha1_to_hex(sha1), refname_nons);
745         capabilities = NULL;
746         if (!(o->flags & OUR_REF)) {
747                 o->flags |= OUR_REF;
748                 nr_our_refs++;
749         }
750         if (o->type == OBJ_TAG) {
751                 o = deref_tag_noverify(o);
752                 if (o)
753                         packet_write(1, "%s %s^{}\n", sha1_to_hex(o->sha1), refname_nons);
754         }
755         return 0;
756 }
757
758 static int mark_our_ref(const char *refname, const unsigned char *sha1, int flag, void *cb_data)
759 {
760         struct object *o = parse_object(sha1);
761         if (!o)
762                 die("git upload-pack: cannot find object %s:", sha1_to_hex(sha1));
763         if (!(o->flags & OUR_REF)) {
764                 o->flags |= OUR_REF;
765                 nr_our_refs++;
766         }
767         return 0;
768 }
769
770 static void upload_pack(void)
771 {
772         if (advertise_refs || !stateless_rpc) {
773                 reset_timeout();
774                 head_ref_namespaced(send_ref, NULL);
775                 for_each_namespaced_ref(send_ref, NULL);
776                 packet_flush(1);
777         } else {
778                 head_ref_namespaced(mark_our_ref, NULL);
779                 for_each_namespaced_ref(mark_our_ref, NULL);
780         }
781         if (advertise_refs)
782                 return;
783
784         receive_needs();
785         if (want_obj.nr) {
786                 get_common_commits();
787                 create_pack_file();
788         }
789 }
790
791 int main(int argc, char **argv)
792 {
793         char *dir;
794         int i;
795         int strict = 0;
796
797         git_setup_gettext();
798
799         packet_trace_identity("upload-pack");
800         git_extract_argv0_path(argv[0]);
801         read_replace_refs = 0;
802
803         for (i = 1; i < argc; i++) {
804                 char *arg = argv[i];
805
806                 if (arg[0] != '-')
807                         break;
808                 if (!strcmp(arg, "--advertise-refs")) {
809                         advertise_refs = 1;
810                         continue;
811                 }
812                 if (!strcmp(arg, "--stateless-rpc")) {
813                         stateless_rpc = 1;
814                         continue;
815                 }
816                 if (!strcmp(arg, "--strict")) {
817                         strict = 1;
818                         continue;
819                 }
820                 if (!prefixcmp(arg, "--timeout=")) {
821                         timeout = atoi(arg+10);
822                         daemon_mode = 1;
823                         continue;
824                 }
825                 if (!strcmp(arg, "--")) {
826                         i++;
827                         break;
828                 }
829         }
830
831         if (i != argc-1)
832                 usage(upload_pack_usage);
833
834         setup_path();
835
836         dir = argv[i];
837
838         if (!enter_repo(dir, strict))
839                 die("'%s' does not appear to be a git repository", dir);
840         if (is_repository_shallow())
841                 die("attempt to fetch/clone from a shallow repository");
842         if (getenv("GIT_DEBUG_SEND_PACK"))
843                 debug_fd = atoi(getenv("GIT_DEBUG_SEND_PACK"));
844         upload_pack();
845         return 0;
846 }