Merge branch 'jm/maint-gitweb-filter-forks-fix' 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 "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, const struct name_path *path, const char *component)
88 {
89         /* An object with name "foo\n0000000..." can be used to
90          * confuse downstream git-pack-objects very badly.
91          */
92         const char *name = path_name(path, component);
93         const char *ep = strchr(name, '\n');
94         if (ep) {
95                 fprintf(pack_pipe, "%s %.*s\n", sha1_to_hex(obj->sha1),
96                        (int) (ep - name),
97                        name);
98         }
99         else
100                 fprintf(pack_pipe, "%s %s\n",
101                                 sha1_to_hex(obj->sha1), name);
102         free((char *)name);
103 }
104
105 static void show_edge(struct commit *commit)
106 {
107         fprintf(pack_pipe, "-%s\n", sha1_to_hex(commit->object.sha1));
108 }
109
110 static int do_rev_list(int in, int out, void *user_data)
111 {
112         int i;
113         struct rev_info revs;
114
115         pack_pipe = xfdopen(out, "w");
116         init_revisions(&revs, NULL);
117         revs.tag_objects = 1;
118         revs.tree_objects = 1;
119         revs.blob_objects = 1;
120         if (use_thin_pack)
121                 revs.edge_hint = 1;
122
123         for (i = 0; i < want_obj.nr; i++) {
124                 struct object *o = want_obj.objects[i].item;
125                 /* why??? */
126                 o->flags &= ~UNINTERESTING;
127                 add_pending_object(&revs, o, NULL);
128         }
129         for (i = 0; i < have_obj.nr; i++) {
130                 struct object *o = have_obj.objects[i].item;
131                 o->flags |= UNINTERESTING;
132                 add_pending_object(&revs, o, NULL);
133         }
134         setup_revisions(0, NULL, &revs, NULL);
135         if (prepare_revision_walk(&revs))
136                 die("revision walk setup failed");
137         mark_edges_uninteresting(revs.commits, &revs, show_edge);
138         if (use_thin_pack)
139                 for (i = 0; i < extra_edge_obj.nr; i++)
140                         fprintf(pack_pipe, "-%s\n", sha1_to_hex(
141                                         extra_edge_obj.objects[i].item->sha1));
142         traverse_commit_list(&revs, show_commit, show_object, NULL);
143         fflush(pack_pipe);
144         fclose(pack_pipe);
145         return 0;
146 }
147
148 static void create_pack_file(void)
149 {
150         struct async rev_list;
151         struct child_process pack_objects;
152         int create_full_pack = (nr_our_refs == want_obj.nr && !have_obj.nr);
153         char data[8193], progress[128];
154         char abort_msg[] = "aborting due to possible repository "
155                 "corruption on the remote side.";
156         int buffered = -1;
157         ssize_t sz;
158         const char *argv[10];
159         int arg = 0;
160
161         argv[arg++] = "pack-objects";
162         if (!shallow_nr) {
163                 argv[arg++] = "--revs";
164                 if (create_full_pack)
165                         argv[arg++] = "--all";
166                 else if (use_thin_pack)
167                         argv[arg++] = "--thin";
168         }
169
170         argv[arg++] = "--stdout";
171         if (!no_progress)
172                 argv[arg++] = "--progress";
173         if (use_ofs_delta)
174                 argv[arg++] = "--delta-base-offset";
175         if (use_include_tag)
176                 argv[arg++] = "--include-tag";
177         argv[arg++] = NULL;
178
179         memset(&pack_objects, 0, sizeof(pack_objects));
180         pack_objects.in = -1;
181         pack_objects.out = -1;
182         pack_objects.err = -1;
183         pack_objects.git_cmd = 1;
184         pack_objects.argv = argv;
185
186         if (start_command(&pack_objects))
187                 die("git upload-pack: unable to fork git-pack-objects");
188
189         if (shallow_nr) {
190                 memset(&rev_list, 0, sizeof(rev_list));
191                 rev_list.proc = do_rev_list;
192                 rev_list.out = pack_objects.in;
193                 if (start_async(&rev_list))
194                         die("git upload-pack: unable to fork git-rev-list");
195         }
196         else {
197                 FILE *pipe_fd = xfdopen(pack_objects.in, "w");
198                 if (!create_full_pack) {
199                         int i;
200                         for (i = 0; i < want_obj.nr; i++)
201                                 fprintf(pipe_fd, "%s\n", sha1_to_hex(want_obj.objects[i].item->sha1));
202                         fprintf(pipe_fd, "--not\n");
203                         for (i = 0; i < have_obj.nr; i++)
204                                 fprintf(pipe_fd, "%s\n", sha1_to_hex(have_obj.objects[i].item->sha1));
205                 }
206
207                 fprintf(pipe_fd, "\n");
208                 fflush(pipe_fd);
209                 fclose(pipe_fd);
210         }
211
212
213         /* We read from pack_objects.err to capture stderr output for
214          * progress bar, and pack_objects.out to capture the pack data.
215          */
216
217         while (1) {
218                 struct pollfd pfd[2];
219                 int pe, pu, pollsize;
220
221                 reset_timeout();
222
223                 pollsize = 0;
224                 pe = pu = -1;
225
226                 if (0 <= pack_objects.out) {
227                         pfd[pollsize].fd = pack_objects.out;
228                         pfd[pollsize].events = POLLIN;
229                         pu = pollsize;
230                         pollsize++;
231                 }
232                 if (0 <= pack_objects.err) {
233                         pfd[pollsize].fd = pack_objects.err;
234                         pfd[pollsize].events = POLLIN;
235                         pe = pollsize;
236                         pollsize++;
237                 }
238
239                 if (!pollsize)
240                         break;
241
242                 if (poll(pfd, pollsize, -1) < 0) {
243                         if (errno != EINTR) {
244                                 error("poll failed, resuming: %s",
245                                       strerror(errno));
246                                 sleep(1);
247                         }
248                         continue;
249                 }
250                 if (0 <= pe && (pfd[pe].revents & (POLLIN|POLLHUP))) {
251                         /* Status ready; we ship that in the side-band
252                          * or dump to the standard error.
253                          */
254                         sz = xread(pack_objects.err, progress,
255                                   sizeof(progress));
256                         if (0 < sz)
257                                 send_client_data(2, progress, sz);
258                         else if (sz == 0) {
259                                 close(pack_objects.err);
260                                 pack_objects.err = -1;
261                         }
262                         else
263                                 goto fail;
264                         /* give priority to status messages */
265                         continue;
266                 }
267                 if (0 <= pu && (pfd[pu].revents & (POLLIN|POLLHUP))) {
268                         /* Data ready; we keep the last byte to ourselves
269                          * in case we detect broken rev-list, so that we
270                          * can leave the stream corrupted.  This is
271                          * unfortunate -- unpack-objects would happily
272                          * accept a valid packdata with trailing garbage,
273                          * so appending garbage after we pass all the
274                          * pack data is not good enough to signal
275                          * breakage to downstream.
276                          */
277                         char *cp = data;
278                         ssize_t outsz = 0;
279                         if (0 <= buffered) {
280                                 *cp++ = buffered;
281                                 outsz++;
282                         }
283                         sz = xread(pack_objects.out, cp,
284                                   sizeof(data) - outsz);
285                         if (0 < sz)
286                                 ;
287                         else if (sz == 0) {
288                                 close(pack_objects.out);
289                                 pack_objects.out = -1;
290                         }
291                         else
292                                 goto fail;
293                         sz += outsz;
294                         if (1 < sz) {
295                                 buffered = data[sz-1] & 0xFF;
296                                 sz--;
297                         }
298                         else
299                                 buffered = -1;
300                         sz = send_client_data(1, data, sz);
301                         if (sz < 0)
302                                 goto fail;
303                 }
304         }
305
306         if (finish_command(&pack_objects)) {
307                 error("git upload-pack: git-pack-objects died with error.");
308                 goto fail;
309         }
310         if (shallow_nr && finish_async(&rev_list))
311                 goto fail;      /* error was already reported */
312
313         /* flush the data */
314         if (0 <= buffered) {
315                 data[0] = buffered;
316                 sz = send_client_data(1, data, 1);
317                 if (sz < 0)
318                         goto fail;
319                 fprintf(stderr, "flushed.\n");
320         }
321         if (use_sideband)
322                 packet_flush(1);
323         return;
324
325  fail:
326         send_client_data(3, abort_msg, sizeof(abort_msg));
327         die("git upload-pack: %s", abort_msg);
328 }
329
330 static int got_sha1(char *hex, unsigned char *sha1)
331 {
332         struct object *o;
333         int we_knew_they_have = 0;
334
335         if (get_sha1_hex(hex, sha1))
336                 die("git upload-pack: expected SHA1 object, got '%s'", hex);
337         if (!has_sha1_file(sha1))
338                 return -1;
339
340         o = lookup_object(sha1);
341         if (!(o && o->parsed))
342                 o = parse_object(sha1);
343         if (!o)
344                 die("oops (%s)", sha1_to_hex(sha1));
345         if (o->type == OBJ_COMMIT) {
346                 struct commit_list *parents;
347                 struct commit *commit = (struct commit *)o;
348                 if (o->flags & THEY_HAVE)
349                         we_knew_they_have = 1;
350                 else
351                         o->flags |= THEY_HAVE;
352                 if (!oldest_have || (commit->date < oldest_have))
353                         oldest_have = commit->date;
354                 for (parents = commit->parents;
355                      parents;
356                      parents = parents->next)
357                         parents->item->object.flags |= THEY_HAVE;
358         }
359         if (!we_knew_they_have) {
360                 add_object_array(o, NULL, &have_obj);
361                 return 1;
362         }
363         return 0;
364 }
365
366 static int reachable(struct commit *want)
367 {
368         struct commit_list *work = NULL;
369
370         commit_list_insert_by_date(want, &work);
371         while (work) {
372                 struct commit_list *list = work->next;
373                 struct commit *commit = work->item;
374                 free(work);
375                 work = list;
376
377                 if (commit->object.flags & THEY_HAVE) {
378                         want->object.flags |= COMMON_KNOWN;
379                         break;
380                 }
381                 if (!commit->object.parsed)
382                         parse_object(commit->object.sha1);
383                 if (commit->object.flags & REACHABLE)
384                         continue;
385                 commit->object.flags |= REACHABLE;
386                 if (commit->date < oldest_have)
387                         continue;
388                 for (list = commit->parents; list; list = list->next) {
389                         struct commit *parent = list->item;
390                         if (!(parent->object.flags & REACHABLE))
391                                 commit_list_insert_by_date(parent, &work);
392                 }
393         }
394         want->object.flags |= REACHABLE;
395         clear_commit_marks(want, REACHABLE);
396         free_commit_list(work);
397         return (want->object.flags & COMMON_KNOWN);
398 }
399
400 static int ok_to_give_up(void)
401 {
402         int i;
403
404         if (!have_obj.nr)
405                 return 0;
406
407         for (i = 0; i < want_obj.nr; i++) {
408                 struct object *want = want_obj.objects[i].item;
409
410                 if (want->flags & COMMON_KNOWN)
411                         continue;
412                 want = deref_tag(want, "a want line", 0);
413                 if (!want || want->type != OBJ_COMMIT) {
414                         /* no way to tell if this is reachable by
415                          * looking at the ancestry chain alone, so
416                          * leave a note to ourselves not to worry about
417                          * this object anymore.
418                          */
419                         want_obj.objects[i].item->flags |= COMMON_KNOWN;
420                         continue;
421                 }
422                 if (!reachable((struct commit *)want))
423                         return 0;
424         }
425         return 1;
426 }
427
428 static int get_common_commits(void)
429 {
430         static char line[1000];
431         unsigned char sha1[20];
432         char last_hex[41];
433         int got_common = 0;
434         int got_other = 0;
435         int sent_ready = 0;
436
437         save_commit_buffer = 0;
438
439         for (;;) {
440                 int len = packet_read_line(0, line, sizeof(line));
441                 reset_timeout();
442
443                 if (!len) {
444                         if (multi_ack == 2 && got_common
445                             && !got_other && ok_to_give_up()) {
446                                 sent_ready = 1;
447                                 packet_write(1, "ACK %s ready\n", last_hex);
448                         }
449                         if (have_obj.nr == 0 || multi_ack)
450                                 packet_write(1, "NAK\n");
451
452                         if (no_done && sent_ready) {
453                                 packet_write(1, "ACK %s\n", last_hex);
454                                 return 0;
455                         }
456                         if (stateless_rpc)
457                                 exit(0);
458                         got_common = 0;
459                         got_other = 0;
460                         continue;
461                 }
462                 strip(line, len);
463                 if (!prefixcmp(line, "have ")) {
464                         switch (got_sha1(line+5, sha1)) {
465                         case -1: /* they have what we do not */
466                                 got_other = 1;
467                                 if (multi_ack && ok_to_give_up()) {
468                                         const char *hex = sha1_to_hex(sha1);
469                                         if (multi_ack == 2) {
470                                                 sent_ready = 1;
471                                                 packet_write(1, "ACK %s ready\n", hex);
472                                         } else
473                                                 packet_write(1, "ACK %s continue\n", hex);
474                                 }
475                                 break;
476                         default:
477                                 got_common = 1;
478                                 memcpy(last_hex, sha1_to_hex(sha1), 41);
479                                 if (multi_ack == 2)
480                                         packet_write(1, "ACK %s common\n", last_hex);
481                                 else if (multi_ack)
482                                         packet_write(1, "ACK %s continue\n", last_hex);
483                                 else if (have_obj.nr == 1)
484                                         packet_write(1, "ACK %s\n", last_hex);
485                                 break;
486                         }
487                         continue;
488                 }
489                 if (!strcmp(line, "done")) {
490                         if (have_obj.nr > 0) {
491                                 if (multi_ack)
492                                         packet_write(1, "ACK %s\n", last_hex);
493                                 return 0;
494                         }
495                         packet_write(1, "NAK\n");
496                         return -1;
497                 }
498                 die("git upload-pack: expected SHA1 list, got '%s'", line);
499         }
500 }
501
502 static void check_non_tip(void)
503 {
504         static const char *argv[] = {
505                 "rev-list", "--stdin", NULL,
506         };
507         static struct child_process cmd;
508         struct object *o;
509         char namebuf[42]; /* ^ + SHA-1 + LF */
510         int i;
511
512         /* In the normal in-process case non-tip request can never happen */
513         if (!stateless_rpc)
514                 goto error;
515
516         cmd.argv = argv;
517         cmd.git_cmd = 1;
518         cmd.no_stderr = 1;
519         cmd.in = -1;
520         cmd.out = -1;
521
522         if (start_command(&cmd))
523                 goto error;
524
525         /*
526          * If rev-list --stdin encounters an unknown commit, it
527          * terminates, which will cause SIGPIPE in the write loop
528          * below.
529          */
530         sigchain_push(SIGPIPE, SIG_IGN);
531
532         namebuf[0] = '^';
533         namebuf[41] = '\n';
534         for (i = get_max_object_index(); 0 < i; ) {
535                 o = get_indexed_object(--i);
536                 if (!o)
537                         continue;
538                 if (!(o->flags & OUR_REF))
539                         continue;
540                 memcpy(namebuf + 1, sha1_to_hex(o->sha1), 40);
541                 if (write_in_full(cmd.in, namebuf, 42) < 0)
542                         goto error;
543         }
544         namebuf[40] = '\n';
545         for (i = 0; i < want_obj.nr; i++) {
546                 o = want_obj.objects[i].item;
547                 if (o->flags & OUR_REF)
548                         continue;
549                 memcpy(namebuf, sha1_to_hex(o->sha1), 40);
550                 if (write_in_full(cmd.in, namebuf, 41) < 0)
551                         goto error;
552         }
553         close(cmd.in);
554
555         sigchain_pop(SIGPIPE);
556
557         /*
558          * The commits out of the rev-list are not ancestors of
559          * our ref.
560          */
561         i = read_in_full(cmd.out, namebuf, 1);
562         if (i)
563                 goto error;
564         close(cmd.out);
565
566         /*
567          * rev-list may have died by encountering a bad commit
568          * in the history, in which case we do want to bail out
569          * even when it showed no commit.
570          */
571         if (finish_command(&cmd))
572                 goto error;
573
574         /* All the non-tip ones are ancestors of what we advertised */
575         return;
576
577 error:
578         /* Pick one of them (we know there at least is one) */
579         for (i = 0; i < want_obj.nr; i++) {
580                 o = want_obj.objects[i].item;
581                 if (!(o->flags & OUR_REF))
582                         die("git upload-pack: not our ref %s",
583                             sha1_to_hex(o->sha1));
584         }
585 }
586
587 static void receive_needs(void)
588 {
589         struct object_array shallows = OBJECT_ARRAY_INIT;
590         static char line[1000];
591         int len, depth = 0;
592         int has_non_tip = 0;
593
594         shallow_nr = 0;
595         if (debug_fd)
596                 write_str_in_full(debug_fd, "#S\n");
597         for (;;) {
598                 struct object *o;
599                 unsigned char sha1_buf[20];
600                 len = packet_read_line(0, line, sizeof(line));
601                 reset_timeout();
602                 if (!len)
603                         break;
604                 if (debug_fd)
605                         write_in_full(debug_fd, line, len);
606
607                 if (!prefixcmp(line, "shallow ")) {
608                         unsigned char sha1[20];
609                         struct object *object;
610                         if (get_sha1(line + 8, sha1))
611                                 die("invalid shallow line: %s", line);
612                         object = parse_object(sha1);
613                         if (!object)
614                                 die("did not find object for %s", line);
615                         object->flags |= CLIENT_SHALLOW;
616                         add_object_array(object, NULL, &shallows);
617                         continue;
618                 }
619                 if (!prefixcmp(line, "deepen ")) {
620                         char *end;
621                         depth = strtol(line + 7, &end, 0);
622                         if (end == line + 7 || depth <= 0)
623                                 die("Invalid deepen: %s", line);
624                         continue;
625                 }
626                 if (prefixcmp(line, "want ") ||
627                     get_sha1_hex(line+5, sha1_buf))
628                         die("git upload-pack: protocol error, "
629                             "expected to get sha, not '%s'", line);
630                 if (strstr(line+45, "multi_ack_detailed"))
631                         multi_ack = 2;
632                 else if (strstr(line+45, "multi_ack"))
633                         multi_ack = 1;
634                 if (strstr(line+45, "no-done"))
635                         no_done = 1;
636                 if (strstr(line+45, "thin-pack"))
637                         use_thin_pack = 1;
638                 if (strstr(line+45, "ofs-delta"))
639                         use_ofs_delta = 1;
640                 if (strstr(line+45, "side-band-64k"))
641                         use_sideband = LARGE_PACKET_MAX;
642                 else if (strstr(line+45, "side-band"))
643                         use_sideband = DEFAULT_PACKET_MAX;
644                 if (strstr(line+45, "no-progress"))
645                         no_progress = 1;
646                 if (strstr(line+45, "include-tag"))
647                         use_include_tag = 1;
648
649                 o = lookup_object(sha1_buf);
650                 if (!o)
651                         die("git upload-pack: not our ref %s",
652                             sha1_to_hex(sha1_buf));
653                 if (!(o->flags & WANTED)) {
654                         o->flags |= WANTED;
655                         if (!(o->flags & OUR_REF))
656                                 has_non_tip = 1;
657                         add_object_array(o, NULL, &want_obj);
658                 }
659         }
660         if (debug_fd)
661                 write_str_in_full(debug_fd, "#E\n");
662
663         /*
664          * We have sent all our refs already, and the other end
665          * should have chosen out of them. When we are operating
666          * in the stateless RPC mode, however, their choice may
667          * have been based on the set of older refs advertised
668          * by another process that handled the initial request.
669          */
670         if (has_non_tip)
671                 check_non_tip();
672
673         if (!use_sideband && daemon_mode)
674                 no_progress = 1;
675
676         if (depth == 0 && shallows.nr == 0)
677                 return;
678         if (depth > 0) {
679                 struct commit_list *result, *backup;
680                 int i;
681                 backup = result = get_shallow_commits(&want_obj, depth,
682                         SHALLOW, NOT_SHALLOW);
683                 while (result) {
684                         struct object *object = &result->item->object;
685                         if (!(object->flags & (CLIENT_SHALLOW|NOT_SHALLOW))) {
686                                 packet_write(1, "shallow %s",
687                                                 sha1_to_hex(object->sha1));
688                                 register_shallow(object->sha1);
689                                 shallow_nr++;
690                         }
691                         result = result->next;
692                 }
693                 free_commit_list(backup);
694                 for (i = 0; i < shallows.nr; i++) {
695                         struct object *object = shallows.objects[i].item;
696                         if (object->flags & NOT_SHALLOW) {
697                                 struct commit_list *parents;
698                                 packet_write(1, "unshallow %s",
699                                         sha1_to_hex(object->sha1));
700                                 object->flags &= ~CLIENT_SHALLOW;
701                                 /* make sure the real parents are parsed */
702                                 unregister_shallow(object->sha1);
703                                 object->parsed = 0;
704                                 if (parse_commit((struct commit *)object))
705                                         die("invalid commit");
706                                 parents = ((struct commit *)object)->parents;
707                                 while (parents) {
708                                         add_object_array(&parents->item->object,
709                                                         NULL, &want_obj);
710                                         parents = parents->next;
711                                 }
712                                 add_object_array(object, NULL, &extra_edge_obj);
713                         }
714                         /* make sure commit traversal conforms to client */
715                         register_shallow(object->sha1);
716                 }
717                 packet_flush(1);
718         } else
719                 if (shallows.nr > 0) {
720                         int i;
721                         for (i = 0; i < shallows.nr; i++)
722                                 register_shallow(shallows.objects[i].item->sha1);
723                 }
724
725         shallow_nr += shallows.nr;
726         free(shallows.objects);
727 }
728
729 static int send_ref(const char *refname, const unsigned char *sha1, int flag, void *cb_data)
730 {
731         static const char *capabilities = "multi_ack thin-pack side-band"
732                 " side-band-64k ofs-delta shallow no-progress"
733                 " include-tag multi_ack_detailed";
734         struct object *o = parse_object(sha1);
735         const char *refname_nons = strip_namespace(refname);
736
737         if (!o)
738                 die("git upload-pack: cannot find object %s:", sha1_to_hex(sha1));
739
740         if (capabilities)
741                 packet_write(1, "%s %s%c%s%s\n", sha1_to_hex(sha1), refname_nons,
742                              0, capabilities,
743                              stateless_rpc ? " no-done" : "");
744         else
745                 packet_write(1, "%s %s\n", sha1_to_hex(sha1), refname_nons);
746         capabilities = NULL;
747         if (!(o->flags & OUR_REF)) {
748                 o->flags |= OUR_REF;
749                 nr_our_refs++;
750         }
751         if (o->type == OBJ_TAG) {
752                 o = deref_tag(o, refname, 0);
753                 if (o)
754                         packet_write(1, "%s %s^{}\n", sha1_to_hex(o->sha1), refname_nons);
755         }
756         return 0;
757 }
758
759 static int mark_our_ref(const char *refname, const unsigned char *sha1, int flag, void *cb_data)
760 {
761         struct object *o = parse_object(sha1);
762         if (!o)
763                 die("git upload-pack: cannot find object %s:", sha1_to_hex(sha1));
764         if (!(o->flags & OUR_REF)) {
765                 o->flags |= OUR_REF;
766                 nr_our_refs++;
767         }
768         return 0;
769 }
770
771 static void upload_pack(void)
772 {
773         if (advertise_refs || !stateless_rpc) {
774                 reset_timeout();
775                 head_ref_namespaced(send_ref, NULL);
776                 for_each_namespaced_ref(send_ref, NULL);
777                 packet_flush(1);
778         } else {
779                 head_ref_namespaced(mark_our_ref, NULL);
780                 for_each_namespaced_ref(mark_our_ref, NULL);
781         }
782         if (advertise_refs)
783                 return;
784
785         receive_needs();
786         if (want_obj.nr) {
787                 get_common_commits();
788                 create_pack_file();
789         }
790 }
791
792 int main(int argc, char **argv)
793 {
794         char *dir;
795         int i;
796         int strict = 0;
797
798         packet_trace_identity("upload-pack");
799         git_extract_argv0_path(argv[0]);
800         read_replace_refs = 0;
801
802         for (i = 1; i < argc; i++) {
803                 char *arg = argv[i];
804
805                 if (arg[0] != '-')
806                         break;
807                 if (!strcmp(arg, "--advertise-refs")) {
808                         advertise_refs = 1;
809                         continue;
810                 }
811                 if (!strcmp(arg, "--stateless-rpc")) {
812                         stateless_rpc = 1;
813                         continue;
814                 }
815                 if (!strcmp(arg, "--strict")) {
816                         strict = 1;
817                         continue;
818                 }
819                 if (!prefixcmp(arg, "--timeout=")) {
820                         timeout = atoi(arg+10);
821                         daemon_mode = 1;
822                         continue;
823                 }
824                 if (!strcmp(arg, "--")) {
825                         i++;
826                         break;
827                 }
828         }
829
830         if (i != argc-1)
831                 usage(upload_pack_usage);
832
833         setup_path();
834
835         dir = argv[i];
836
837         if (!enter_repo(dir, strict))
838                 die("'%s' does not appear to be a git repository", dir);
839         if (is_repository_shallow())
840                 die("attempt to fetch/clone from a shallow repository");
841         if (getenv("GIT_DEBUG_SEND_PACK"))
842                 debug_fd = atoi(getenv("GIT_DEBUG_SEND_PACK"));
843         upload_pack();
844         return 0;
845 }