Add multi_ack_detailed capability to fetch-pack/upload-pack
[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
14 static const char upload_pack_usage[] = "git upload-pack [--strict] [--timeout=nn] <dir>";
15
16 /* bits #0..7 in revision.h, #8..10 in commit.c */
17 #define THEY_HAVE       (1u << 11)
18 #define OUR_REF         (1u << 12)
19 #define WANTED          (1u << 13)
20 #define COMMON_KNOWN    (1u << 14)
21 #define REACHABLE       (1u << 15)
22
23 #define SHALLOW         (1u << 16)
24 #define NOT_SHALLOW     (1u << 17)
25 #define CLIENT_SHALLOW  (1u << 18)
26
27 static unsigned long oldest_have;
28
29 static int multi_ack, nr_our_refs;
30 static int use_thin_pack, use_ofs_delta, use_include_tag;
31 static int no_progress, daemon_mode;
32 static int shallow_nr;
33 static struct object_array have_obj;
34 static struct object_array want_obj;
35 static struct object_array extra_edge_obj;
36 static unsigned int timeout;
37 /* 0 for no sideband,
38  * otherwise maximum packet size (up to 65520 bytes).
39  */
40 static int use_sideband;
41 static int debug_fd;
42
43 static void reset_timeout(void)
44 {
45         alarm(timeout);
46 }
47
48 static int strip(char *line, int len)
49 {
50         if (len && line[len-1] == '\n')
51                 line[--len] = 0;
52         return len;
53 }
54
55 static ssize_t send_client_data(int fd, const char *data, ssize_t sz)
56 {
57         if (use_sideband)
58                 return send_sideband(1, fd, data, sz, use_sideband);
59         if (fd == 3)
60                 /* emergency quit */
61                 fd = 2;
62         if (fd == 2) {
63                 /* XXX: are we happy to lose stuff here? */
64                 xwrite(fd, data, sz);
65                 return sz;
66         }
67         return safe_write(fd, data, sz);
68 }
69
70 static FILE *pack_pipe = NULL;
71 static void show_commit(struct commit *commit, void *data)
72 {
73         if (commit->object.flags & BOUNDARY)
74                 fputc('-', pack_pipe);
75         if (fputs(sha1_to_hex(commit->object.sha1), pack_pipe) < 0)
76                 die("broken output pipe");
77         fputc('\n', pack_pipe);
78         fflush(pack_pipe);
79         free(commit->buffer);
80         commit->buffer = NULL;
81 }
82
83 static void show_object(struct object *obj, const struct name_path *path, const char *component)
84 {
85         /* An object with name "foo\n0000000..." can be used to
86          * confuse downstream git-pack-objects very badly.
87          */
88         const char *name = path_name(path, component);
89         const char *ep = strchr(name, '\n');
90         if (ep) {
91                 fprintf(pack_pipe, "%s %.*s\n", sha1_to_hex(obj->sha1),
92                        (int) (ep - name),
93                        name);
94         }
95         else
96                 fprintf(pack_pipe, "%s %s\n",
97                                 sha1_to_hex(obj->sha1), name);
98         free((char *)name);
99 }
100
101 static void show_edge(struct commit *commit)
102 {
103         fprintf(pack_pipe, "-%s\n", sha1_to_hex(commit->object.sha1));
104 }
105
106 static int do_rev_list(int fd, void *create_full_pack)
107 {
108         int i;
109         struct rev_info revs;
110
111         pack_pipe = xfdopen(fd, "w");
112         init_revisions(&revs, NULL);
113         revs.tag_objects = 1;
114         revs.tree_objects = 1;
115         revs.blob_objects = 1;
116         if (use_thin_pack)
117                 revs.edge_hint = 1;
118
119         if (create_full_pack) {
120                 const char *args[] = {"rev-list", "--all", NULL};
121                 setup_revisions(2, args, &revs, NULL);
122         } else {
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         }
136         if (prepare_revision_walk(&revs))
137                 die("revision walk setup failed");
138         mark_edges_uninteresting(revs.commits, &revs, show_edge);
139         if (use_thin_pack)
140                 for (i = 0; i < extra_edge_obj.nr; i++)
141                         fprintf(pack_pipe, "-%s\n", sha1_to_hex(
142                                         extra_edge_obj.objects[i].item->sha1));
143         traverse_commit_list(&revs, show_commit, show_object, NULL);
144         fflush(pack_pipe);
145         fclose(pack_pipe);
146         return 0;
147 }
148
149 static int feed_msg_to_hook(int fd, const char *fmt, ...)
150 {
151         int cnt;
152         char buf[1024];
153         va_list params;
154
155         va_start(params, fmt);
156         cnt = vsprintf(buf, fmt, params);
157         va_end(params);
158         return write_in_full(fd, buf, cnt) != cnt;
159 }
160
161 static int feed_obj_to_hook(const char *label, struct object_array *oa, int i, int fd)
162 {
163         return feed_msg_to_hook(fd, "%s %s\n", label,
164                                 sha1_to_hex(oa->objects[i].item->sha1));
165 }
166
167 static int run_post_upload_pack_hook(size_t total, struct timeval *tv)
168 {
169         const char *argv[2];
170         struct child_process proc;
171         int err, i;
172
173         argv[0] = "hooks/post-upload-pack";
174         argv[1] = NULL;
175
176         if (access(argv[0], X_OK) < 0)
177                 return 0;
178
179         memset(&proc, 0, sizeof(proc));
180         proc.argv = argv;
181         proc.in = -1;
182         proc.stdout_to_stderr = 1;
183         err = start_command(&proc);
184         if (err)
185                 return err;
186         for (i = 0; !err && i < want_obj.nr; i++)
187                 err |= feed_obj_to_hook("want", &want_obj, i, proc.in);
188         for (i = 0; !err && i < have_obj.nr; i++)
189                 err |= feed_obj_to_hook("have", &have_obj, i, proc.in);
190         if (!err)
191                 err |= feed_msg_to_hook(proc.in, "time %ld.%06ld\n",
192                                         (long)tv->tv_sec, (long)tv->tv_usec);
193         if (!err)
194                 err |= feed_msg_to_hook(proc.in, "size %ld\n", (long)total);
195         if (!err)
196                 err |= feed_msg_to_hook(proc.in, "kind %s\n",
197                                         (nr_our_refs == want_obj.nr && !have_obj.nr)
198                                         ? "clone" : "fetch");
199         if (close(proc.in))
200                 err = 1;
201         if (finish_command(&proc))
202                 err = 1;
203         return err;
204 }
205
206 static void create_pack_file(void)
207 {
208         struct timeval start_tv, tv;
209         struct async rev_list;
210         struct child_process pack_objects;
211         int create_full_pack = (nr_our_refs == want_obj.nr && !have_obj.nr);
212         char data[8193], progress[128];
213         char abort_msg[] = "aborting due to possible repository "
214                 "corruption on the remote side.";
215         int buffered = -1;
216         ssize_t sz, total_sz;
217         const char *argv[10];
218         int arg = 0;
219
220         gettimeofday(&start_tv, NULL);
221         total_sz = 0;
222         if (shallow_nr) {
223                 rev_list.proc = do_rev_list;
224                 rev_list.data = 0;
225                 if (start_async(&rev_list))
226                         die("git upload-pack: unable to fork git-rev-list");
227                 argv[arg++] = "pack-objects";
228         } else {
229                 argv[arg++] = "pack-objects";
230                 argv[arg++] = "--revs";
231                 if (create_full_pack)
232                         argv[arg++] = "--all";
233                 else if (use_thin_pack)
234                         argv[arg++] = "--thin";
235         }
236
237         argv[arg++] = "--stdout";
238         if (!no_progress)
239                 argv[arg++] = "--progress";
240         if (use_ofs_delta)
241                 argv[arg++] = "--delta-base-offset";
242         if (use_include_tag)
243                 argv[arg++] = "--include-tag";
244         argv[arg++] = NULL;
245
246         memset(&pack_objects, 0, sizeof(pack_objects));
247         pack_objects.in = shallow_nr ? rev_list.out : -1;
248         pack_objects.out = -1;
249         pack_objects.err = -1;
250         pack_objects.git_cmd = 1;
251         pack_objects.argv = argv;
252
253         if (start_command(&pack_objects))
254                 die("git upload-pack: unable to fork git-pack-objects");
255
256         /* pass on revisions we (don't) want */
257         if (!shallow_nr) {
258                 FILE *pipe_fd = xfdopen(pack_objects.in, "w");
259                 if (!create_full_pack) {
260                         int i;
261                         for (i = 0; i < want_obj.nr; i++)
262                                 fprintf(pipe_fd, "%s\n", sha1_to_hex(want_obj.objects[i].item->sha1));
263                         fprintf(pipe_fd, "--not\n");
264                         for (i = 0; i < have_obj.nr; i++)
265                                 fprintf(pipe_fd, "%s\n", sha1_to_hex(have_obj.objects[i].item->sha1));
266                 }
267
268                 fprintf(pipe_fd, "\n");
269                 fflush(pipe_fd);
270                 fclose(pipe_fd);
271         }
272
273
274         /* We read from pack_objects.err to capture stderr output for
275          * progress bar, and pack_objects.out to capture the pack data.
276          */
277
278         while (1) {
279                 struct pollfd pfd[2];
280                 int pe, pu, pollsize;
281
282                 reset_timeout();
283
284                 pollsize = 0;
285                 pe = pu = -1;
286
287                 if (0 <= pack_objects.out) {
288                         pfd[pollsize].fd = pack_objects.out;
289                         pfd[pollsize].events = POLLIN;
290                         pu = pollsize;
291                         pollsize++;
292                 }
293                 if (0 <= pack_objects.err) {
294                         pfd[pollsize].fd = pack_objects.err;
295                         pfd[pollsize].events = POLLIN;
296                         pe = pollsize;
297                         pollsize++;
298                 }
299
300                 if (!pollsize)
301                         break;
302
303                 if (poll(pfd, pollsize, -1) < 0) {
304                         if (errno != EINTR) {
305                                 error("poll failed, resuming: %s",
306                                       strerror(errno));
307                                 sleep(1);
308                         }
309                         continue;
310                 }
311                 if (0 <= pu && (pfd[pu].revents & (POLLIN|POLLHUP))) {
312                         /* Data ready; we keep the last byte to ourselves
313                          * in case we detect broken rev-list, so that we
314                          * can leave the stream corrupted.  This is
315                          * unfortunate -- unpack-objects would happily
316                          * accept a valid packdata with trailing garbage,
317                          * so appending garbage after we pass all the
318                          * pack data is not good enough to signal
319                          * breakage to downstream.
320                          */
321                         char *cp = data;
322                         ssize_t outsz = 0;
323                         if (0 <= buffered) {
324                                 *cp++ = buffered;
325                                 outsz++;
326                         }
327                         sz = xread(pack_objects.out, cp,
328                                   sizeof(data) - outsz);
329                         if (0 < sz)
330                                 total_sz += sz;
331                         else if (sz == 0) {
332                                 close(pack_objects.out);
333                                 pack_objects.out = -1;
334                         }
335                         else
336                                 goto fail;
337                         sz += outsz;
338                         if (1 < sz) {
339                                 buffered = data[sz-1] & 0xFF;
340                                 sz--;
341                         }
342                         else
343                                 buffered = -1;
344                         sz = send_client_data(1, data, sz);
345                         if (sz < 0)
346                                 goto fail;
347                 }
348                 if (0 <= pe && (pfd[pe].revents & (POLLIN|POLLHUP))) {
349                         /* Status ready; we ship that in the side-band
350                          * or dump to the standard error.
351                          */
352                         sz = xread(pack_objects.err, progress,
353                                   sizeof(progress));
354                         if (0 < sz)
355                                 send_client_data(2, progress, sz);
356                         else if (sz == 0) {
357                                 close(pack_objects.err);
358                                 pack_objects.err = -1;
359                         }
360                         else
361                                 goto fail;
362                 }
363         }
364
365         if (finish_command(&pack_objects)) {
366                 error("git upload-pack: git-pack-objects died with error.");
367                 goto fail;
368         }
369         if (shallow_nr && finish_async(&rev_list))
370                 goto fail;      /* error was already reported */
371
372         /* flush the data */
373         if (0 <= buffered) {
374                 data[0] = buffered;
375                 sz = send_client_data(1, data, 1);
376                 if (sz < 0)
377                         goto fail;
378                 fprintf(stderr, "flushed.\n");
379         }
380         if (use_sideband)
381                 packet_flush(1);
382
383         gettimeofday(&tv, NULL);
384         tv.tv_sec -= start_tv.tv_sec;
385         if (tv.tv_usec < start_tv.tv_usec) {
386                 tv.tv_sec--;
387                 tv.tv_usec += 1000000;
388         }
389         tv.tv_usec -= start_tv.tv_usec;
390         if (run_post_upload_pack_hook(total_sz, &tv))
391                 warning("post-upload-hook failed");
392         return;
393
394  fail:
395         send_client_data(3, abort_msg, sizeof(abort_msg));
396         die("git upload-pack: %s", abort_msg);
397 }
398
399 static int got_sha1(char *hex, unsigned char *sha1)
400 {
401         struct object *o;
402         int we_knew_they_have = 0;
403
404         if (get_sha1_hex(hex, sha1))
405                 die("git upload-pack: expected SHA1 object, got '%s'", hex);
406         if (!has_sha1_file(sha1))
407                 return -1;
408
409         o = lookup_object(sha1);
410         if (!(o && o->parsed))
411                 o = parse_object(sha1);
412         if (!o)
413                 die("oops (%s)", sha1_to_hex(sha1));
414         if (o->type == OBJ_COMMIT) {
415                 struct commit_list *parents;
416                 struct commit *commit = (struct commit *)o;
417                 if (o->flags & THEY_HAVE)
418                         we_knew_they_have = 1;
419                 else
420                         o->flags |= THEY_HAVE;
421                 if (!oldest_have || (commit->date < oldest_have))
422                         oldest_have = commit->date;
423                 for (parents = commit->parents;
424                      parents;
425                      parents = parents->next)
426                         parents->item->object.flags |= THEY_HAVE;
427         }
428         if (!we_knew_they_have) {
429                 add_object_array(o, NULL, &have_obj);
430                 return 1;
431         }
432         return 0;
433 }
434
435 static int reachable(struct commit *want)
436 {
437         struct commit_list *work = NULL;
438
439         insert_by_date(want, &work);
440         while (work) {
441                 struct commit_list *list = work->next;
442                 struct commit *commit = work->item;
443                 free(work);
444                 work = list;
445
446                 if (commit->object.flags & THEY_HAVE) {
447                         want->object.flags |= COMMON_KNOWN;
448                         break;
449                 }
450                 if (!commit->object.parsed)
451                         parse_object(commit->object.sha1);
452                 if (commit->object.flags & REACHABLE)
453                         continue;
454                 commit->object.flags |= REACHABLE;
455                 if (commit->date < oldest_have)
456                         continue;
457                 for (list = commit->parents; list; list = list->next) {
458                         struct commit *parent = list->item;
459                         if (!(parent->object.flags & REACHABLE))
460                                 insert_by_date(parent, &work);
461                 }
462         }
463         want->object.flags |= REACHABLE;
464         clear_commit_marks(want, REACHABLE);
465         free_commit_list(work);
466         return (want->object.flags & COMMON_KNOWN);
467 }
468
469 static int ok_to_give_up(void)
470 {
471         int i;
472
473         if (!have_obj.nr)
474                 return 0;
475
476         for (i = 0; i < want_obj.nr; i++) {
477                 struct object *want = want_obj.objects[i].item;
478
479                 if (want->flags & COMMON_KNOWN)
480                         continue;
481                 want = deref_tag(want, "a want line", 0);
482                 if (!want || want->type != OBJ_COMMIT) {
483                         /* no way to tell if this is reachable by
484                          * looking at the ancestry chain alone, so
485                          * leave a note to ourselves not to worry about
486                          * this object anymore.
487                          */
488                         want_obj.objects[i].item->flags |= COMMON_KNOWN;
489                         continue;
490                 }
491                 if (!reachable((struct commit *)want))
492                         return 0;
493         }
494         return 1;
495 }
496
497 static int get_common_commits(void)
498 {
499         static char line[1000];
500         unsigned char sha1[20];
501         char last_hex[41];
502
503         save_commit_buffer = 0;
504
505         for (;;) {
506                 int len = packet_read_line(0, line, sizeof(line));
507                 reset_timeout();
508
509                 if (!len) {
510                         if (have_obj.nr == 0 || multi_ack)
511                                 packet_write(1, "NAK\n");
512                         continue;
513                 }
514                 strip(line, len);
515                 if (!prefixcmp(line, "have ")) {
516                         switch (got_sha1(line+5, sha1)) {
517                         case -1: /* they have what we do not */
518                                 if (multi_ack && ok_to_give_up()) {
519                                         const char *hex = sha1_to_hex(sha1);
520                                         if (multi_ack == 2)
521                                                 packet_write(1, "ACK %s ready\n", hex);
522                                         else
523                                                 packet_write(1, "ACK %s continue\n", hex);
524                                 }
525                                 break;
526                         default:
527                                 memcpy(last_hex, sha1_to_hex(sha1), 41);
528                                 if (multi_ack == 2)
529                                         packet_write(1, "ACK %s common\n", last_hex);
530                                 else if (multi_ack)
531                                         packet_write(1, "ACK %s continue\n", last_hex);
532                                 else if (have_obj.nr == 1)
533                                         packet_write(1, "ACK %s\n", last_hex);
534                                 break;
535                         }
536                         continue;
537                 }
538                 if (!strcmp(line, "done")) {
539                         if (have_obj.nr > 0) {
540                                 if (multi_ack)
541                                         packet_write(1, "ACK %s\n", last_hex);
542                                 return 0;
543                         }
544                         packet_write(1, "NAK\n");
545                         return -1;
546                 }
547                 die("git upload-pack: expected SHA1 list, got '%s'", line);
548         }
549 }
550
551 static void receive_needs(void)
552 {
553         struct object_array shallows = {0, 0, NULL};
554         static char line[1000];
555         int len, depth = 0;
556
557         shallow_nr = 0;
558         if (debug_fd)
559                 write_str_in_full(debug_fd, "#S\n");
560         for (;;) {
561                 struct object *o;
562                 unsigned char sha1_buf[20];
563                 len = packet_read_line(0, line, sizeof(line));
564                 reset_timeout();
565                 if (!len)
566                         break;
567                 if (debug_fd)
568                         write_in_full(debug_fd, line, len);
569
570                 if (!prefixcmp(line, "shallow ")) {
571                         unsigned char sha1[20];
572                         struct object *object;
573                         if (get_sha1(line + 8, sha1))
574                                 die("invalid shallow line: %s", line);
575                         object = parse_object(sha1);
576                         if (!object)
577                                 die("did not find object for %s", line);
578                         object->flags |= CLIENT_SHALLOW;
579                         add_object_array(object, NULL, &shallows);
580                         continue;
581                 }
582                 if (!prefixcmp(line, "deepen ")) {
583                         char *end;
584                         depth = strtol(line + 7, &end, 0);
585                         if (end == line + 7 || depth <= 0)
586                                 die("Invalid deepen: %s", line);
587                         continue;
588                 }
589                 if (prefixcmp(line, "want ") ||
590                     get_sha1_hex(line+5, sha1_buf))
591                         die("git upload-pack: protocol error, "
592                             "expected to get sha, not '%s'", line);
593                 if (strstr(line+45, "multi_ack_detailed"))
594                         multi_ack = 2;
595                 else if (strstr(line+45, "multi_ack"))
596                         multi_ack = 1;
597                 if (strstr(line+45, "thin-pack"))
598                         use_thin_pack = 1;
599                 if (strstr(line+45, "ofs-delta"))
600                         use_ofs_delta = 1;
601                 if (strstr(line+45, "side-band-64k"))
602                         use_sideband = LARGE_PACKET_MAX;
603                 else if (strstr(line+45, "side-band"))
604                         use_sideband = DEFAULT_PACKET_MAX;
605                 if (strstr(line+45, "no-progress"))
606                         no_progress = 1;
607                 if (strstr(line+45, "include-tag"))
608                         use_include_tag = 1;
609
610                 /* We have sent all our refs already, and the other end
611                  * should have chosen out of them; otherwise they are
612                  * asking for nonsense.
613                  *
614                  * Hmph.  We may later want to allow "want" line that
615                  * asks for something like "master~10" (symbolic)...
616                  * would it make sense?  I don't know.
617                  */
618                 o = lookup_object(sha1_buf);
619                 if (!o || !(o->flags & OUR_REF))
620                         die("git upload-pack: not our ref %s", line+5);
621                 if (!(o->flags & WANTED)) {
622                         o->flags |= WANTED;
623                         add_object_array(o, NULL, &want_obj);
624                 }
625         }
626         if (debug_fd)
627                 write_str_in_full(debug_fd, "#E\n");
628
629         if (!use_sideband && daemon_mode)
630                 no_progress = 1;
631
632         if (depth == 0 && shallows.nr == 0)
633                 return;
634         if (depth > 0) {
635                 struct commit_list *result, *backup;
636                 int i;
637                 backup = result = get_shallow_commits(&want_obj, depth,
638                         SHALLOW, NOT_SHALLOW);
639                 while (result) {
640                         struct object *object = &result->item->object;
641                         if (!(object->flags & (CLIENT_SHALLOW|NOT_SHALLOW))) {
642                                 packet_write(1, "shallow %s",
643                                                 sha1_to_hex(object->sha1));
644                                 register_shallow(object->sha1);
645                                 shallow_nr++;
646                         }
647                         result = result->next;
648                 }
649                 free_commit_list(backup);
650                 for (i = 0; i < shallows.nr; i++) {
651                         struct object *object = shallows.objects[i].item;
652                         if (object->flags & NOT_SHALLOW) {
653                                 struct commit_list *parents;
654                                 packet_write(1, "unshallow %s",
655                                         sha1_to_hex(object->sha1));
656                                 object->flags &= ~CLIENT_SHALLOW;
657                                 /* make sure the real parents are parsed */
658                                 unregister_shallow(object->sha1);
659                                 object->parsed = 0;
660                                 if (parse_commit((struct commit *)object))
661                                         die("invalid commit");
662                                 parents = ((struct commit *)object)->parents;
663                                 while (parents) {
664                                         add_object_array(&parents->item->object,
665                                                         NULL, &want_obj);
666                                         parents = parents->next;
667                                 }
668                                 add_object_array(object, NULL, &extra_edge_obj);
669                         }
670                         /* make sure commit traversal conforms to client */
671                         register_shallow(object->sha1);
672                 }
673                 packet_flush(1);
674         } else
675                 if (shallows.nr > 0) {
676                         int i;
677                         for (i = 0; i < shallows.nr; i++)
678                                 register_shallow(shallows.objects[i].item->sha1);
679                 }
680
681         shallow_nr += shallows.nr;
682         free(shallows.objects);
683 }
684
685 static int send_ref(const char *refname, const unsigned char *sha1, int flag, void *cb_data)
686 {
687         static const char *capabilities = "multi_ack thin-pack side-band"
688                 " side-band-64k ofs-delta shallow no-progress"
689                 " include-tag multi_ack_detailed";
690         struct object *o = parse_object(sha1);
691
692         if (!o)
693                 die("git upload-pack: cannot find object %s:", sha1_to_hex(sha1));
694
695         if (capabilities)
696                 packet_write(1, "%s %s%c%s\n", sha1_to_hex(sha1), refname,
697                         0, capabilities);
698         else
699                 packet_write(1, "%s %s\n", sha1_to_hex(sha1), refname);
700         capabilities = NULL;
701         if (!(o->flags & OUR_REF)) {
702                 o->flags |= OUR_REF;
703                 nr_our_refs++;
704         }
705         if (o->type == OBJ_TAG) {
706                 o = deref_tag(o, refname, 0);
707                 if (o)
708                         packet_write(1, "%s %s^{}\n", sha1_to_hex(o->sha1), refname);
709         }
710         return 0;
711 }
712
713 static void upload_pack(void)
714 {
715         reset_timeout();
716         head_ref(send_ref, NULL);
717         for_each_ref(send_ref, NULL);
718         packet_flush(1);
719         receive_needs();
720         if (want_obj.nr) {
721                 get_common_commits();
722                 create_pack_file();
723         }
724 }
725
726 int main(int argc, char **argv)
727 {
728         char *dir;
729         int i;
730         int strict = 0;
731
732         git_extract_argv0_path(argv[0]);
733         read_replace_refs = 0;
734
735         for (i = 1; i < argc; i++) {
736                 char *arg = argv[i];
737
738                 if (arg[0] != '-')
739                         break;
740                 if (!strcmp(arg, "--strict")) {
741                         strict = 1;
742                         continue;
743                 }
744                 if (!prefixcmp(arg, "--timeout=")) {
745                         timeout = atoi(arg+10);
746                         daemon_mode = 1;
747                         continue;
748                 }
749                 if (!strcmp(arg, "--")) {
750                         i++;
751                         break;
752                 }
753         }
754
755         if (i != argc-1)
756                 usage(upload_pack_usage);
757
758         setup_path();
759
760         dir = argv[i];
761
762         if (!enter_repo(dir, strict))
763                 die("'%s' does not appear to be a git repository", dir);
764         if (is_repository_shallow())
765                 die("attempt to fetch/clone from a shallow repository");
766         if (getenv("GIT_DEBUG_SEND_PACK"))
767                 debug_fd = atoi(getenv("GIT_DEBUG_SEND_PACK"));
768         upload_pack();
769         return 0;
770 }