Merge branch 'tb/doc-fetch-pack-url'
[git] / upload-pack.c
1 #include "cache.h"
2 #include "refs.h"
3 #include "pkt-line.h"
4 #include "sideband.h"
5 #include "tag.h"
6 #include "object.h"
7 #include "commit.h"
8 #include "exec_cmd.h"
9 #include "diff.h"
10 #include "revision.h"
11 #include "list-objects.h"
12 #include "run-command.h"
13 #include "connect.h"
14 #include "sigchain.h"
15 #include "version.h"
16 #include "string-list.h"
17
18 static const char upload_pack_usage[] = "git upload-pack [--strict] [--timeout=<n>] <dir>";
19
20 /* bits #0..7 in revision.h, #8..10 in commit.c */
21 #define THEY_HAVE       (1u << 11)
22 #define OUR_REF         (1u << 12)
23 #define WANTED          (1u << 13)
24 #define COMMON_KNOWN    (1u << 14)
25 #define REACHABLE       (1u << 15)
26
27 #define SHALLOW         (1u << 16)
28 #define NOT_SHALLOW     (1u << 17)
29 #define CLIENT_SHALLOW  (1u << 18)
30 #define HIDDEN_REF      (1u << 19)
31
32 static unsigned long oldest_have;
33
34 static int multi_ack;
35 static int no_done;
36 static int use_thin_pack, use_ofs_delta, use_include_tag;
37 static int no_progress, daemon_mode;
38 static int allow_tip_sha1_in_want;
39 static int shallow_nr;
40 static struct object_array have_obj;
41 static struct object_array want_obj;
42 static struct object_array extra_edge_obj;
43 static unsigned int timeout;
44 static int keepalive = 5;
45 /* 0 for no sideband,
46  * otherwise maximum packet size (up to 65520 bytes).
47  */
48 static int use_sideband;
49 static int advertise_refs;
50 static int stateless_rpc;
51
52 static void reset_timeout(void)
53 {
54         alarm(timeout);
55 }
56
57 static ssize_t send_client_data(int fd, const char *data, ssize_t sz)
58 {
59         if (use_sideband)
60                 return send_sideband(1, fd, data, sz, use_sideband);
61         if (fd == 3)
62                 /* emergency quit */
63                 fd = 2;
64         if (fd == 2) {
65                 /* XXX: are we happy to lose stuff here? */
66                 xwrite(fd, data, sz);
67                 return sz;
68         }
69         write_or_die(fd, data, sz);
70         return sz;
71 }
72
73 static void create_pack_file(void)
74 {
75         struct child_process pack_objects;
76         char data[8193], progress[128];
77         char abort_msg[] = "aborting due to possible repository "
78                 "corruption on the remote side.";
79         int buffered = -1;
80         ssize_t sz;
81         const char *argv[12];
82         int i, arg = 0;
83         FILE *pipe_fd;
84         char *shallow_file = NULL;
85
86         if (shallow_nr) {
87                 shallow_file = setup_temporary_shallow();
88                 argv[arg++] = "--shallow-file";
89                 argv[arg++] = shallow_file;
90         }
91         argv[arg++] = "pack-objects";
92         argv[arg++] = "--revs";
93         if (use_thin_pack)
94                 argv[arg++] = "--thin";
95
96         argv[arg++] = "--stdout";
97         if (!no_progress)
98                 argv[arg++] = "--progress";
99         if (use_ofs_delta)
100                 argv[arg++] = "--delta-base-offset";
101         if (use_include_tag)
102                 argv[arg++] = "--include-tag";
103         argv[arg++] = NULL;
104
105         memset(&pack_objects, 0, sizeof(pack_objects));
106         pack_objects.in = -1;
107         pack_objects.out = -1;
108         pack_objects.err = -1;
109         pack_objects.git_cmd = 1;
110         pack_objects.argv = argv;
111
112         if (start_command(&pack_objects))
113                 die("git upload-pack: unable to fork git-pack-objects");
114
115         pipe_fd = xfdopen(pack_objects.in, "w");
116
117         for (i = 0; i < want_obj.nr; i++)
118                 fprintf(pipe_fd, "%s\n",
119                         sha1_to_hex(want_obj.objects[i].item->sha1));
120         fprintf(pipe_fd, "--not\n");
121         for (i = 0; i < have_obj.nr; i++)
122                 fprintf(pipe_fd, "%s\n",
123                         sha1_to_hex(have_obj.objects[i].item->sha1));
124         for (i = 0; i < extra_edge_obj.nr; i++)
125                 fprintf(pipe_fd, "%s\n",
126                         sha1_to_hex(extra_edge_obj.objects[i].item->sha1));
127         fprintf(pipe_fd, "\n");
128         fflush(pipe_fd);
129         fclose(pipe_fd);
130
131         /* We read from pack_objects.err to capture stderr output for
132          * progress bar, and pack_objects.out to capture the pack data.
133          */
134
135         while (1) {
136                 struct pollfd pfd[2];
137                 int pe, pu, pollsize;
138                 int ret;
139
140                 reset_timeout();
141
142                 pollsize = 0;
143                 pe = pu = -1;
144
145                 if (0 <= pack_objects.out) {
146                         pfd[pollsize].fd = pack_objects.out;
147                         pfd[pollsize].events = POLLIN;
148                         pu = pollsize;
149                         pollsize++;
150                 }
151                 if (0 <= pack_objects.err) {
152                         pfd[pollsize].fd = pack_objects.err;
153                         pfd[pollsize].events = POLLIN;
154                         pe = pollsize;
155                         pollsize++;
156                 }
157
158                 if (!pollsize)
159                         break;
160
161                 ret = poll(pfd, pollsize, 1000 * keepalive);
162                 if (ret < 0) {
163                         if (errno != EINTR) {
164                                 error("poll failed, resuming: %s",
165                                       strerror(errno));
166                                 sleep(1);
167                         }
168                         continue;
169                 }
170                 if (0 <= pe && (pfd[pe].revents & (POLLIN|POLLHUP))) {
171                         /* Status ready; we ship that in the side-band
172                          * or dump to the standard error.
173                          */
174                         sz = xread(pack_objects.err, progress,
175                                   sizeof(progress));
176                         if (0 < sz)
177                                 send_client_data(2, progress, sz);
178                         else if (sz == 0) {
179                                 close(pack_objects.err);
180                                 pack_objects.err = -1;
181                         }
182                         else
183                                 goto fail;
184                         /* give priority to status messages */
185                         continue;
186                 }
187                 if (0 <= pu && (pfd[pu].revents & (POLLIN|POLLHUP))) {
188                         /* Data ready; we keep the last byte to ourselves
189                          * in case we detect broken rev-list, so that we
190                          * can leave the stream corrupted.  This is
191                          * unfortunate -- unpack-objects would happily
192                          * accept a valid packdata with trailing garbage,
193                          * so appending garbage after we pass all the
194                          * pack data is not good enough to signal
195                          * breakage to downstream.
196                          */
197                         char *cp = data;
198                         ssize_t outsz = 0;
199                         if (0 <= buffered) {
200                                 *cp++ = buffered;
201                                 outsz++;
202                         }
203                         sz = xread(pack_objects.out, cp,
204                                   sizeof(data) - outsz);
205                         if (0 < sz)
206                                 ;
207                         else if (sz == 0) {
208                                 close(pack_objects.out);
209                                 pack_objects.out = -1;
210                         }
211                         else
212                                 goto fail;
213                         sz += outsz;
214                         if (1 < sz) {
215                                 buffered = data[sz-1] & 0xFF;
216                                 sz--;
217                         }
218                         else
219                                 buffered = -1;
220                         sz = send_client_data(1, data, sz);
221                         if (sz < 0)
222                                 goto fail;
223                 }
224
225                 /*
226                  * We hit the keepalive timeout without saying anything; send
227                  * an empty message on the data sideband just to let the other
228                  * side know we're still working on it, but don't have any data
229                  * yet.
230                  *
231                  * If we don't have a sideband channel, there's no room in the
232                  * protocol to say anything, so those clients are just out of
233                  * luck.
234                  */
235                 if (!ret && use_sideband) {
236                         static const char buf[] = "0005\1";
237                         write_or_die(1, buf, 5);
238                 }
239         }
240
241         if (finish_command(&pack_objects)) {
242                 error("git upload-pack: git-pack-objects died with error.");
243                 goto fail;
244         }
245         if (shallow_file) {
246                 if (*shallow_file)
247                         unlink(shallow_file);
248                 free(shallow_file);
249         }
250
251         /* flush the data */
252         if (0 <= buffered) {
253                 data[0] = buffered;
254                 sz = send_client_data(1, data, 1);
255                 if (sz < 0)
256                         goto fail;
257                 fprintf(stderr, "flushed.\n");
258         }
259         if (use_sideband)
260                 packet_flush(1);
261         return;
262
263  fail:
264         send_client_data(3, abort_msg, sizeof(abort_msg));
265         die("git upload-pack: %s", abort_msg);
266 }
267
268 static int got_sha1(char *hex, unsigned char *sha1)
269 {
270         struct object *o;
271         int we_knew_they_have = 0;
272
273         if (get_sha1_hex(hex, sha1))
274                 die("git upload-pack: expected SHA1 object, got '%s'", hex);
275         if (!has_sha1_file(sha1))
276                 return -1;
277
278         o = parse_object(sha1);
279         if (!o)
280                 die("oops (%s)", sha1_to_hex(sha1));
281         if (o->type == OBJ_COMMIT) {
282                 struct commit_list *parents;
283                 struct commit *commit = (struct commit *)o;
284                 if (o->flags & THEY_HAVE)
285                         we_knew_they_have = 1;
286                 else
287                         o->flags |= THEY_HAVE;
288                 if (!oldest_have || (commit->date < oldest_have))
289                         oldest_have = commit->date;
290                 for (parents = commit->parents;
291                      parents;
292                      parents = parents->next)
293                         parents->item->object.flags |= THEY_HAVE;
294         }
295         if (!we_knew_they_have) {
296                 add_object_array(o, NULL, &have_obj);
297                 return 1;
298         }
299         return 0;
300 }
301
302 static int reachable(struct commit *want)
303 {
304         struct commit_list *work = NULL;
305
306         commit_list_insert_by_date(want, &work);
307         while (work) {
308                 struct commit_list *list = work->next;
309                 struct commit *commit = work->item;
310                 free(work);
311                 work = list;
312
313                 if (commit->object.flags & THEY_HAVE) {
314                         want->object.flags |= COMMON_KNOWN;
315                         break;
316                 }
317                 if (!commit->object.parsed)
318                         parse_object(commit->object.sha1);
319                 if (commit->object.flags & REACHABLE)
320                         continue;
321                 commit->object.flags |= REACHABLE;
322                 if (commit->date < oldest_have)
323                         continue;
324                 for (list = commit->parents; list; list = list->next) {
325                         struct commit *parent = list->item;
326                         if (!(parent->object.flags & REACHABLE))
327                                 commit_list_insert_by_date(parent, &work);
328                 }
329         }
330         want->object.flags |= REACHABLE;
331         clear_commit_marks(want, REACHABLE);
332         free_commit_list(work);
333         return (want->object.flags & COMMON_KNOWN);
334 }
335
336 static int ok_to_give_up(void)
337 {
338         int i;
339
340         if (!have_obj.nr)
341                 return 0;
342
343         for (i = 0; i < want_obj.nr; i++) {
344                 struct object *want = want_obj.objects[i].item;
345
346                 if (want->flags & COMMON_KNOWN)
347                         continue;
348                 want = deref_tag(want, "a want line", 0);
349                 if (!want || want->type != OBJ_COMMIT) {
350                         /* no way to tell if this is reachable by
351                          * looking at the ancestry chain alone, so
352                          * leave a note to ourselves not to worry about
353                          * this object anymore.
354                          */
355                         want_obj.objects[i].item->flags |= COMMON_KNOWN;
356                         continue;
357                 }
358                 if (!reachable((struct commit *)want))
359                         return 0;
360         }
361         return 1;
362 }
363
364 static int get_common_commits(void)
365 {
366         unsigned char sha1[20];
367         char last_hex[41];
368         int got_common = 0;
369         int got_other = 0;
370         int sent_ready = 0;
371
372         save_commit_buffer = 0;
373
374         for (;;) {
375                 char *line = packet_read_line(0, NULL);
376                 reset_timeout();
377
378                 if (!line) {
379                         if (multi_ack == 2 && got_common
380                             && !got_other && ok_to_give_up()) {
381                                 sent_ready = 1;
382                                 packet_write(1, "ACK %s ready\n", last_hex);
383                         }
384                         if (have_obj.nr == 0 || multi_ack)
385                                 packet_write(1, "NAK\n");
386
387                         if (no_done && sent_ready) {
388                                 packet_write(1, "ACK %s\n", last_hex);
389                                 return 0;
390                         }
391                         if (stateless_rpc)
392                                 exit(0);
393                         got_common = 0;
394                         got_other = 0;
395                         continue;
396                 }
397                 if (!prefixcmp(line, "have ")) {
398                         switch (got_sha1(line+5, sha1)) {
399                         case -1: /* they have what we do not */
400                                 got_other = 1;
401                                 if (multi_ack && ok_to_give_up()) {
402                                         const char *hex = sha1_to_hex(sha1);
403                                         if (multi_ack == 2) {
404                                                 sent_ready = 1;
405                                                 packet_write(1, "ACK %s ready\n", hex);
406                                         } else
407                                                 packet_write(1, "ACK %s continue\n", hex);
408                                 }
409                                 break;
410                         default:
411                                 got_common = 1;
412                                 memcpy(last_hex, sha1_to_hex(sha1), 41);
413                                 if (multi_ack == 2)
414                                         packet_write(1, "ACK %s common\n", last_hex);
415                                 else if (multi_ack)
416                                         packet_write(1, "ACK %s continue\n", last_hex);
417                                 else if (have_obj.nr == 1)
418                                         packet_write(1, "ACK %s\n", last_hex);
419                                 break;
420                         }
421                         continue;
422                 }
423                 if (!strcmp(line, "done")) {
424                         if (have_obj.nr > 0) {
425                                 if (multi_ack)
426                                         packet_write(1, "ACK %s\n", last_hex);
427                                 return 0;
428                         }
429                         packet_write(1, "NAK\n");
430                         return -1;
431                 }
432                 die("git upload-pack: expected SHA1 list, got '%s'", line);
433         }
434 }
435
436 static int is_our_ref(struct object *o)
437 {
438         return o->flags &
439                 ((allow_tip_sha1_in_want ? HIDDEN_REF : 0) | OUR_REF);
440 }
441
442 static void check_non_tip(void)
443 {
444         static const char *argv[] = {
445                 "rev-list", "--stdin", NULL,
446         };
447         static struct child_process cmd;
448         struct object *o;
449         char namebuf[42]; /* ^ + SHA-1 + LF */
450         int i;
451
452         /* In the normal in-process case non-tip request can never happen */
453         if (!stateless_rpc)
454                 goto error;
455
456         cmd.argv = argv;
457         cmd.git_cmd = 1;
458         cmd.no_stderr = 1;
459         cmd.in = -1;
460         cmd.out = -1;
461
462         if (start_command(&cmd))
463                 goto error;
464
465         /*
466          * If rev-list --stdin encounters an unknown commit, it
467          * terminates, which will cause SIGPIPE in the write loop
468          * below.
469          */
470         sigchain_push(SIGPIPE, SIG_IGN);
471
472         namebuf[0] = '^';
473         namebuf[41] = '\n';
474         for (i = get_max_object_index(); 0 < i; ) {
475                 o = get_indexed_object(--i);
476                 if (!o)
477                         continue;
478                 if (!is_our_ref(o))
479                         continue;
480                 memcpy(namebuf + 1, sha1_to_hex(o->sha1), 40);
481                 if (write_in_full(cmd.in, namebuf, 42) < 0)
482                         goto error;
483         }
484         namebuf[40] = '\n';
485         for (i = 0; i < want_obj.nr; i++) {
486                 o = want_obj.objects[i].item;
487                 if (is_our_ref(o))
488                         continue;
489                 memcpy(namebuf, sha1_to_hex(o->sha1), 40);
490                 if (write_in_full(cmd.in, namebuf, 41) < 0)
491                         goto error;
492         }
493         close(cmd.in);
494
495         sigchain_pop(SIGPIPE);
496
497         /*
498          * The commits out of the rev-list are not ancestors of
499          * our ref.
500          */
501         i = read_in_full(cmd.out, namebuf, 1);
502         if (i)
503                 goto error;
504         close(cmd.out);
505
506         /*
507          * rev-list may have died by encountering a bad commit
508          * in the history, in which case we do want to bail out
509          * even when it showed no commit.
510          */
511         if (finish_command(&cmd))
512                 goto error;
513
514         /* All the non-tip ones are ancestors of what we advertised */
515         return;
516
517 error:
518         /* Pick one of them (we know there at least is one) */
519         for (i = 0; i < want_obj.nr; i++) {
520                 o = want_obj.objects[i].item;
521                 if (!is_our_ref(o))
522                         die("git upload-pack: not our ref %s",
523                             sha1_to_hex(o->sha1));
524         }
525 }
526
527 static void receive_needs(void)
528 {
529         struct object_array shallows = OBJECT_ARRAY_INIT;
530         int depth = 0;
531         int has_non_tip = 0;
532
533         shallow_nr = 0;
534         for (;;) {
535                 struct object *o;
536                 const char *features;
537                 unsigned char sha1_buf[20];
538                 char *line = packet_read_line(0, NULL);
539                 reset_timeout();
540                 if (!line)
541                         break;
542
543                 if (!prefixcmp(line, "shallow ")) {
544                         unsigned char sha1[20];
545                         struct object *object;
546                         if (get_sha1_hex(line + 8, sha1))
547                                 die("invalid shallow line: %s", line);
548                         object = parse_object(sha1);
549                         if (!object)
550                                 continue;
551                         if (object->type != OBJ_COMMIT)
552                                 die("invalid shallow object %s", sha1_to_hex(sha1));
553                         if (!(object->flags & CLIENT_SHALLOW)) {
554                                 object->flags |= CLIENT_SHALLOW;
555                                 add_object_array(object, NULL, &shallows);
556                         }
557                         continue;
558                 }
559                 if (!prefixcmp(line, "deepen ")) {
560                         char *end;
561                         depth = strtol(line + 7, &end, 0);
562                         if (end == line + 7 || depth <= 0)
563                                 die("Invalid deepen: %s", line);
564                         continue;
565                 }
566                 if (prefixcmp(line, "want ") ||
567                     get_sha1_hex(line+5, sha1_buf))
568                         die("git upload-pack: protocol error, "
569                             "expected to get sha, not '%s'", line);
570
571                 features = line + 45;
572
573                 if (parse_feature_request(features, "multi_ack_detailed"))
574                         multi_ack = 2;
575                 else if (parse_feature_request(features, "multi_ack"))
576                         multi_ack = 1;
577                 if (parse_feature_request(features, "no-done"))
578                         no_done = 1;
579                 if (parse_feature_request(features, "thin-pack"))
580                         use_thin_pack = 1;
581                 if (parse_feature_request(features, "ofs-delta"))
582                         use_ofs_delta = 1;
583                 if (parse_feature_request(features, "side-band-64k"))
584                         use_sideband = LARGE_PACKET_MAX;
585                 else if (parse_feature_request(features, "side-band"))
586                         use_sideband = DEFAULT_PACKET_MAX;
587                 if (parse_feature_request(features, "no-progress"))
588                         no_progress = 1;
589                 if (parse_feature_request(features, "include-tag"))
590                         use_include_tag = 1;
591
592                 o = parse_object(sha1_buf);
593                 if (!o)
594                         die("git upload-pack: not our ref %s",
595                             sha1_to_hex(sha1_buf));
596                 if (!(o->flags & WANTED)) {
597                         o->flags |= WANTED;
598                         if (!is_our_ref(o))
599                                 has_non_tip = 1;
600                         add_object_array(o, NULL, &want_obj);
601                 }
602         }
603
604         /*
605          * We have sent all our refs already, and the other end
606          * should have chosen out of them. When we are operating
607          * in the stateless RPC mode, however, their choice may
608          * have been based on the set of older refs advertised
609          * by another process that handled the initial request.
610          */
611         if (has_non_tip)
612                 check_non_tip();
613
614         if (!use_sideband && daemon_mode)
615                 no_progress = 1;
616
617         if (depth == 0 && shallows.nr == 0)
618                 return;
619         if (depth > 0) {
620                 struct commit_list *result = NULL, *backup = NULL;
621                 int i;
622                 if (depth == INFINITE_DEPTH)
623                         for (i = 0; i < shallows.nr; i++) {
624                                 struct object *object = shallows.objects[i].item;
625                                 object->flags |= NOT_SHALLOW;
626                         }
627                 else
628                         backup = result =
629                                 get_shallow_commits(&want_obj, depth,
630                                                     SHALLOW, NOT_SHALLOW);
631                 while (result) {
632                         struct object *object = &result->item->object;
633                         if (!(object->flags & (CLIENT_SHALLOW|NOT_SHALLOW))) {
634                                 packet_write(1, "shallow %s",
635                                                 sha1_to_hex(object->sha1));
636                                 register_shallow(object->sha1);
637                                 shallow_nr++;
638                         }
639                         result = result->next;
640                 }
641                 free_commit_list(backup);
642                 for (i = 0; i < shallows.nr; i++) {
643                         struct object *object = shallows.objects[i].item;
644                         if (object->flags & NOT_SHALLOW) {
645                                 struct commit_list *parents;
646                                 packet_write(1, "unshallow %s",
647                                         sha1_to_hex(object->sha1));
648                                 object->flags &= ~CLIENT_SHALLOW;
649                                 /* make sure the real parents are parsed */
650                                 unregister_shallow(object->sha1);
651                                 object->parsed = 0;
652                                 if (parse_commit((struct commit *)object))
653                                         die("invalid commit");
654                                 parents = ((struct commit *)object)->parents;
655                                 while (parents) {
656                                         add_object_array(&parents->item->object,
657                                                         NULL, &want_obj);
658                                         parents = parents->next;
659                                 }
660                                 add_object_array(object, NULL, &extra_edge_obj);
661                         }
662                         /* make sure commit traversal conforms to client */
663                         register_shallow(object->sha1);
664                 }
665                 packet_flush(1);
666         } else
667                 if (shallows.nr > 0) {
668                         int i;
669                         for (i = 0; i < shallows.nr; i++)
670                                 register_shallow(shallows.objects[i].item->sha1);
671                 }
672
673         shallow_nr += shallows.nr;
674         free(shallows.objects);
675 }
676
677 /* return non-zero if the ref is hidden, otherwise 0 */
678 static int mark_our_ref(const char *refname, const unsigned char *sha1, int flag, void *cb_data)
679 {
680         struct object *o = lookup_unknown_object(sha1);
681
682         if (ref_is_hidden(refname)) {
683                 o->flags |= HIDDEN_REF;
684                 return 1;
685         }
686         if (!o)
687                 die("git upload-pack: cannot find object %s:", sha1_to_hex(sha1));
688         o->flags |= OUR_REF;
689         return 0;
690 }
691
692 static void format_symref_info(struct strbuf *buf, struct string_list *symref)
693 {
694         struct string_list_item *item;
695
696         if (!symref->nr)
697                 return;
698         for_each_string_list_item(item, symref)
699                 strbuf_addf(buf, " symref=%s:%s", item->string, (char *)item->util);
700 }
701
702 static int send_ref(const char *refname, const unsigned char *sha1, int flag, void *cb_data)
703 {
704         static const char *capabilities = "multi_ack thin-pack side-band"
705                 " side-band-64k ofs-delta shallow no-progress"
706                 " include-tag multi_ack_detailed";
707         const char *refname_nons = strip_namespace(refname);
708         unsigned char peeled[20];
709
710         if (mark_our_ref(refname, sha1, flag, NULL))
711                 return 0;
712
713         if (capabilities) {
714                 struct strbuf symref_info = STRBUF_INIT;
715
716                 format_symref_info(&symref_info, cb_data);
717                 packet_write(1, "%s %s%c%s%s%s%s agent=%s\n",
718                              sha1_to_hex(sha1), refname_nons,
719                              0, capabilities,
720                              allow_tip_sha1_in_want ? " allow-tip-sha1-in-want" : "",
721                              stateless_rpc ? " no-done" : "",
722                              symref_info.buf,
723                              git_user_agent_sanitized());
724                 strbuf_release(&symref_info);
725         } else {
726                 packet_write(1, "%s %s\n", sha1_to_hex(sha1), refname_nons);
727         }
728         capabilities = NULL;
729         if (!peel_ref(refname, peeled))
730                 packet_write(1, "%s %s^{}\n", sha1_to_hex(peeled), refname_nons);
731         return 0;
732 }
733
734 static int find_symref(const char *refname, const unsigned char *sha1, int flag,
735                        void *cb_data)
736 {
737         const char *symref_target;
738         struct string_list_item *item;
739         unsigned char unused[20];
740
741         if ((flag & REF_ISSYMREF) == 0)
742                 return 0;
743         symref_target = resolve_ref_unsafe(refname, unused, 0, &flag);
744         if (!symref_target || (flag & REF_ISSYMREF) == 0)
745                 die("'%s' is a symref but it is not?", refname);
746         item = string_list_append(cb_data, refname);
747         item->util = xstrdup(symref_target);
748         return 0;
749 }
750
751 static void upload_pack(void)
752 {
753         struct string_list symref = STRING_LIST_INIT_DUP;
754
755         head_ref_namespaced(find_symref, &symref);
756
757         if (advertise_refs || !stateless_rpc) {
758                 reset_timeout();
759                 head_ref_namespaced(send_ref, &symref);
760                 for_each_namespaced_ref(send_ref, &symref);
761                 packet_flush(1);
762         } else {
763                 head_ref_namespaced(mark_our_ref, NULL);
764                 for_each_namespaced_ref(mark_our_ref, NULL);
765         }
766         string_list_clear(&symref, 1);
767         if (advertise_refs)
768                 return;
769
770         receive_needs();
771         if (want_obj.nr) {
772                 get_common_commits();
773                 create_pack_file();
774         }
775 }
776
777 static int upload_pack_config(const char *var, const char *value, void *unused)
778 {
779         if (!strcmp("uploadpack.allowtipsha1inwant", var))
780                 allow_tip_sha1_in_want = git_config_bool(var, value);
781         else if (!strcmp("uploadpack.keepalive", var)) {
782                 keepalive = git_config_int(var, value);
783                 if (!keepalive)
784                         keepalive = -1;
785         }
786         return parse_hide_refs_config(var, value, "uploadpack");
787 }
788
789 int main(int argc, char **argv)
790 {
791         char *dir;
792         int i;
793         int strict = 0;
794
795         git_setup_gettext();
796
797         packet_trace_identity("upload-pack");
798         git_extract_argv0_path(argv[0]);
799         read_replace_refs = 0;
800
801         for (i = 1; i < argc; i++) {
802                 char *arg = argv[i];
803
804                 if (arg[0] != '-')
805                         break;
806                 if (!strcmp(arg, "--advertise-refs")) {
807                         advertise_refs = 1;
808                         continue;
809                 }
810                 if (!strcmp(arg, "--stateless-rpc")) {
811                         stateless_rpc = 1;
812                         continue;
813                 }
814                 if (!strcmp(arg, "--strict")) {
815                         strict = 1;
816                         continue;
817                 }
818                 if (!prefixcmp(arg, "--timeout=")) {
819                         timeout = atoi(arg+10);
820                         daemon_mode = 1;
821                         continue;
822                 }
823                 if (!strcmp(arg, "--")) {
824                         i++;
825                         break;
826                 }
827         }
828
829         if (i != argc-1)
830                 usage(upload_pack_usage);
831
832         setup_path();
833
834         dir = argv[i];
835
836         if (!enter_repo(dir, strict))
837                 die("'%s' does not appear to be a git repository", dir);
838         if (is_repository_shallow())
839                 die("attempt to fetch/clone from a shallow repository");
840         git_config(upload_pack_config, NULL);
841         upload_pack();
842         return 0;
843 }