Merge branch 'cn/fetch-prune-overlapping-destination' 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 "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         const char *shallow_file = NULL;
85
86         if (shallow_nr) {
87                 shallow_file = setup_temporary_shallow(NULL);
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
246         /* flush the data */
247         if (0 <= buffered) {
248                 data[0] = buffered;
249                 sz = send_client_data(1, data, 1);
250                 if (sz < 0)
251                         goto fail;
252                 fprintf(stderr, "flushed.\n");
253         }
254         if (use_sideband)
255                 packet_flush(1);
256         return;
257
258  fail:
259         send_client_data(3, abort_msg, sizeof(abort_msg));
260         die("git upload-pack: %s", abort_msg);
261 }
262
263 static int got_sha1(char *hex, unsigned char *sha1)
264 {
265         struct object *o;
266         int we_knew_they_have = 0;
267
268         if (get_sha1_hex(hex, sha1))
269                 die("git upload-pack: expected SHA1 object, got '%s'", hex);
270         if (!has_sha1_file(sha1))
271                 return -1;
272
273         o = parse_object(sha1);
274         if (!o)
275                 die("oops (%s)", sha1_to_hex(sha1));
276         if (o->type == OBJ_COMMIT) {
277                 struct commit_list *parents;
278                 struct commit *commit = (struct commit *)o;
279                 if (o->flags & THEY_HAVE)
280                         we_knew_they_have = 1;
281                 else
282                         o->flags |= THEY_HAVE;
283                 if (!oldest_have || (commit->date < oldest_have))
284                         oldest_have = commit->date;
285                 for (parents = commit->parents;
286                      parents;
287                      parents = parents->next)
288                         parents->item->object.flags |= THEY_HAVE;
289         }
290         if (!we_knew_they_have) {
291                 add_object_array(o, NULL, &have_obj);
292                 return 1;
293         }
294         return 0;
295 }
296
297 static int reachable(struct commit *want)
298 {
299         struct commit_list *work = NULL;
300
301         commit_list_insert_by_date(want, &work);
302         while (work) {
303                 struct commit_list *list = work->next;
304                 struct commit *commit = work->item;
305                 free(work);
306                 work = list;
307
308                 if (commit->object.flags & THEY_HAVE) {
309                         want->object.flags |= COMMON_KNOWN;
310                         break;
311                 }
312                 if (!commit->object.parsed)
313                         parse_object(commit->object.sha1);
314                 if (commit->object.flags & REACHABLE)
315                         continue;
316                 commit->object.flags |= REACHABLE;
317                 if (commit->date < oldest_have)
318                         continue;
319                 for (list = commit->parents; list; list = list->next) {
320                         struct commit *parent = list->item;
321                         if (!(parent->object.flags & REACHABLE))
322                                 commit_list_insert_by_date(parent, &work);
323                 }
324         }
325         want->object.flags |= REACHABLE;
326         clear_commit_marks(want, REACHABLE);
327         free_commit_list(work);
328         return (want->object.flags & COMMON_KNOWN);
329 }
330
331 static int ok_to_give_up(void)
332 {
333         int i;
334
335         if (!have_obj.nr)
336                 return 0;
337
338         for (i = 0; i < want_obj.nr; i++) {
339                 struct object *want = want_obj.objects[i].item;
340
341                 if (want->flags & COMMON_KNOWN)
342                         continue;
343                 want = deref_tag(want, "a want line", 0);
344                 if (!want || want->type != OBJ_COMMIT) {
345                         /* no way to tell if this is reachable by
346                          * looking at the ancestry chain alone, so
347                          * leave a note to ourselves not to worry about
348                          * this object anymore.
349                          */
350                         want_obj.objects[i].item->flags |= COMMON_KNOWN;
351                         continue;
352                 }
353                 if (!reachable((struct commit *)want))
354                         return 0;
355         }
356         return 1;
357 }
358
359 static int get_common_commits(void)
360 {
361         unsigned char sha1[20];
362         char last_hex[41];
363         int got_common = 0;
364         int got_other = 0;
365         int sent_ready = 0;
366
367         save_commit_buffer = 0;
368
369         for (;;) {
370                 char *line = packet_read_line(0, NULL);
371                 reset_timeout();
372
373                 if (!line) {
374                         if (multi_ack == 2 && got_common
375                             && !got_other && ok_to_give_up()) {
376                                 sent_ready = 1;
377                                 packet_write(1, "ACK %s ready\n", last_hex);
378                         }
379                         if (have_obj.nr == 0 || multi_ack)
380                                 packet_write(1, "NAK\n");
381
382                         if (no_done && sent_ready) {
383                                 packet_write(1, "ACK %s\n", last_hex);
384                                 return 0;
385                         }
386                         if (stateless_rpc)
387                                 exit(0);
388                         got_common = 0;
389                         got_other = 0;
390                         continue;
391                 }
392                 if (starts_with(line, "have ")) {
393                         switch (got_sha1(line+5, sha1)) {
394                         case -1: /* they have what we do not */
395                                 got_other = 1;
396                                 if (multi_ack && ok_to_give_up()) {
397                                         const char *hex = sha1_to_hex(sha1);
398                                         if (multi_ack == 2) {
399                                                 sent_ready = 1;
400                                                 packet_write(1, "ACK %s ready\n", hex);
401                                         } else
402                                                 packet_write(1, "ACK %s continue\n", hex);
403                                 }
404                                 break;
405                         default:
406                                 got_common = 1;
407                                 memcpy(last_hex, sha1_to_hex(sha1), 41);
408                                 if (multi_ack == 2)
409                                         packet_write(1, "ACK %s common\n", last_hex);
410                                 else if (multi_ack)
411                                         packet_write(1, "ACK %s continue\n", last_hex);
412                                 else if (have_obj.nr == 1)
413                                         packet_write(1, "ACK %s\n", last_hex);
414                                 break;
415                         }
416                         continue;
417                 }
418                 if (!strcmp(line, "done")) {
419                         if (have_obj.nr > 0) {
420                                 if (multi_ack)
421                                         packet_write(1, "ACK %s\n", last_hex);
422                                 return 0;
423                         }
424                         packet_write(1, "NAK\n");
425                         return -1;
426                 }
427                 die("git upload-pack: expected SHA1 list, got '%s'", line);
428         }
429 }
430
431 static int is_our_ref(struct object *o)
432 {
433         return o->flags &
434                 ((allow_tip_sha1_in_want ? HIDDEN_REF : 0) | OUR_REF);
435 }
436
437 static void check_non_tip(void)
438 {
439         static const char *argv[] = {
440                 "rev-list", "--stdin", NULL,
441         };
442         static struct child_process cmd;
443         struct object *o;
444         char namebuf[42]; /* ^ + SHA-1 + LF */
445         int i;
446
447         /* In the normal in-process case non-tip request can never happen */
448         if (!stateless_rpc)
449                 goto error;
450
451         cmd.argv = argv;
452         cmd.git_cmd = 1;
453         cmd.no_stderr = 1;
454         cmd.in = -1;
455         cmd.out = -1;
456
457         if (start_command(&cmd))
458                 goto error;
459
460         /*
461          * If rev-list --stdin encounters an unknown commit, it
462          * terminates, which will cause SIGPIPE in the write loop
463          * below.
464          */
465         sigchain_push(SIGPIPE, SIG_IGN);
466
467         namebuf[0] = '^';
468         namebuf[41] = '\n';
469         for (i = get_max_object_index(); 0 < i; ) {
470                 o = get_indexed_object(--i);
471                 if (!o)
472                         continue;
473                 if (!is_our_ref(o))
474                         continue;
475                 memcpy(namebuf + 1, sha1_to_hex(o->sha1), 40);
476                 if (write_in_full(cmd.in, namebuf, 42) < 0)
477                         goto error;
478         }
479         namebuf[40] = '\n';
480         for (i = 0; i < want_obj.nr; i++) {
481                 o = want_obj.objects[i].item;
482                 if (is_our_ref(o))
483                         continue;
484                 memcpy(namebuf, sha1_to_hex(o->sha1), 40);
485                 if (write_in_full(cmd.in, namebuf, 41) < 0)
486                         goto error;
487         }
488         close(cmd.in);
489
490         sigchain_pop(SIGPIPE);
491
492         /*
493          * The commits out of the rev-list are not ancestors of
494          * our ref.
495          */
496         i = read_in_full(cmd.out, namebuf, 1);
497         if (i)
498                 goto error;
499         close(cmd.out);
500
501         /*
502          * rev-list may have died by encountering a bad commit
503          * in the history, in which case we do want to bail out
504          * even when it showed no commit.
505          */
506         if (finish_command(&cmd))
507                 goto error;
508
509         /* All the non-tip ones are ancestors of what we advertised */
510         return;
511
512 error:
513         /* Pick one of them (we know there at least is one) */
514         for (i = 0; i < want_obj.nr; i++) {
515                 o = want_obj.objects[i].item;
516                 if (!is_our_ref(o))
517                         die("git upload-pack: not our ref %s",
518                             sha1_to_hex(o->sha1));
519         }
520 }
521
522 static void receive_needs(void)
523 {
524         struct object_array shallows = OBJECT_ARRAY_INIT;
525         int depth = 0;
526         int has_non_tip = 0;
527
528         shallow_nr = 0;
529         for (;;) {
530                 struct object *o;
531                 const char *features;
532                 unsigned char sha1_buf[20];
533                 char *line = packet_read_line(0, NULL);
534                 reset_timeout();
535                 if (!line)
536                         break;
537
538                 if (starts_with(line, "shallow ")) {
539                         unsigned char sha1[20];
540                         struct object *object;
541                         if (get_sha1_hex(line + 8, sha1))
542                                 die("invalid shallow line: %s", line);
543                         object = parse_object(sha1);
544                         if (!object)
545                                 continue;
546                         if (object->type != OBJ_COMMIT)
547                                 die("invalid shallow object %s", sha1_to_hex(sha1));
548                         if (!(object->flags & CLIENT_SHALLOW)) {
549                                 object->flags |= CLIENT_SHALLOW;
550                                 add_object_array(object, NULL, &shallows);
551                         }
552                         continue;
553                 }
554                 if (starts_with(line, "deepen ")) {
555                         char *end;
556                         depth = strtol(line + 7, &end, 0);
557                         if (end == line + 7 || depth <= 0)
558                                 die("Invalid deepen: %s", line);
559                         continue;
560                 }
561                 if (!starts_with(line, "want ") ||
562                     get_sha1_hex(line+5, sha1_buf))
563                         die("git upload-pack: protocol error, "
564                             "expected to get sha, not '%s'", line);
565
566                 features = line + 45;
567
568                 if (parse_feature_request(features, "multi_ack_detailed"))
569                         multi_ack = 2;
570                 else if (parse_feature_request(features, "multi_ack"))
571                         multi_ack = 1;
572                 if (parse_feature_request(features, "no-done"))
573                         no_done = 1;
574                 if (parse_feature_request(features, "thin-pack"))
575                         use_thin_pack = 1;
576                 if (parse_feature_request(features, "ofs-delta"))
577                         use_ofs_delta = 1;
578                 if (parse_feature_request(features, "side-band-64k"))
579                         use_sideband = LARGE_PACKET_MAX;
580                 else if (parse_feature_request(features, "side-band"))
581                         use_sideband = DEFAULT_PACKET_MAX;
582                 if (parse_feature_request(features, "no-progress"))
583                         no_progress = 1;
584                 if (parse_feature_request(features, "include-tag"))
585                         use_include_tag = 1;
586
587                 o = parse_object(sha1_buf);
588                 if (!o)
589                         die("git upload-pack: not our ref %s",
590                             sha1_to_hex(sha1_buf));
591                 if (!(o->flags & WANTED)) {
592                         o->flags |= WANTED;
593                         if (!is_our_ref(o))
594                                 has_non_tip = 1;
595                         add_object_array(o, NULL, &want_obj);
596                 }
597         }
598
599         /*
600          * We have sent all our refs already, and the other end
601          * should have chosen out of them. When we are operating
602          * in the stateless RPC mode, however, their choice may
603          * have been based on the set of older refs advertised
604          * by another process that handled the initial request.
605          */
606         if (has_non_tip)
607                 check_non_tip();
608
609         if (!use_sideband && daemon_mode)
610                 no_progress = 1;
611
612         if (depth == 0 && shallows.nr == 0)
613                 return;
614         if (depth > 0) {
615                 struct commit_list *result = NULL, *backup = NULL;
616                 int i;
617                 if (depth == INFINITE_DEPTH && !is_repository_shallow())
618                         for (i = 0; i < shallows.nr; i++) {
619                                 struct object *object = shallows.objects[i].item;
620                                 object->flags |= NOT_SHALLOW;
621                         }
622                 else
623                         backup = result =
624                                 get_shallow_commits(&want_obj, depth,
625                                                     SHALLOW, NOT_SHALLOW);
626                 while (result) {
627                         struct object *object = &result->item->object;
628                         if (!(object->flags & (CLIENT_SHALLOW|NOT_SHALLOW))) {
629                                 packet_write(1, "shallow %s",
630                                                 sha1_to_hex(object->sha1));
631                                 register_shallow(object->sha1);
632                                 shallow_nr++;
633                         }
634                         result = result->next;
635                 }
636                 free_commit_list(backup);
637                 for (i = 0; i < shallows.nr; i++) {
638                         struct object *object = shallows.objects[i].item;
639                         if (object->flags & NOT_SHALLOW) {
640                                 struct commit_list *parents;
641                                 packet_write(1, "unshallow %s",
642                                         sha1_to_hex(object->sha1));
643                                 object->flags &= ~CLIENT_SHALLOW;
644                                 /* make sure the real parents are parsed */
645                                 unregister_shallow(object->sha1);
646                                 object->parsed = 0;
647                                 parse_commit_or_die((struct commit *)object);
648                                 parents = ((struct commit *)object)->parents;
649                                 while (parents) {
650                                         add_object_array(&parents->item->object,
651                                                         NULL, &want_obj);
652                                         parents = parents->next;
653                                 }
654                                 add_object_array(object, NULL, &extra_edge_obj);
655                         }
656                         /* make sure commit traversal conforms to client */
657                         register_shallow(object->sha1);
658                 }
659                 packet_flush(1);
660         } else
661                 if (shallows.nr > 0) {
662                         int i;
663                         for (i = 0; i < shallows.nr; i++)
664                                 register_shallow(shallows.objects[i].item->sha1);
665                 }
666
667         shallow_nr += shallows.nr;
668         free(shallows.objects);
669 }
670
671 /* return non-zero if the ref is hidden, otherwise 0 */
672 static int mark_our_ref(const char *refname, const unsigned char *sha1, int flag, void *cb_data)
673 {
674         struct object *o = lookup_unknown_object(sha1);
675
676         if (ref_is_hidden(refname)) {
677                 o->flags |= HIDDEN_REF;
678                 return 1;
679         }
680         if (!o)
681                 die("git upload-pack: cannot find object %s:", sha1_to_hex(sha1));
682         o->flags |= OUR_REF;
683         return 0;
684 }
685
686 static void format_symref_info(struct strbuf *buf, struct string_list *symref)
687 {
688         struct string_list_item *item;
689
690         if (!symref->nr)
691                 return;
692         for_each_string_list_item(item, symref)
693                 strbuf_addf(buf, " symref=%s:%s", item->string, (char *)item->util);
694 }
695
696 static int send_ref(const char *refname, const unsigned char *sha1, int flag, void *cb_data)
697 {
698         static const char *capabilities = "multi_ack thin-pack side-band"
699                 " side-band-64k ofs-delta shallow no-progress"
700                 " include-tag multi_ack_detailed";
701         const char *refname_nons = strip_namespace(refname);
702         unsigned char peeled[20];
703
704         if (mark_our_ref(refname, sha1, flag, NULL))
705                 return 0;
706
707         if (capabilities) {
708                 struct strbuf symref_info = STRBUF_INIT;
709
710                 format_symref_info(&symref_info, cb_data);
711                 packet_write(1, "%s %s%c%s%s%s%s agent=%s\n",
712                              sha1_to_hex(sha1), refname_nons,
713                              0, capabilities,
714                              allow_tip_sha1_in_want ? " allow-tip-sha1-in-want" : "",
715                              stateless_rpc ? " no-done" : "",
716                              symref_info.buf,
717                              git_user_agent_sanitized());
718                 strbuf_release(&symref_info);
719         } else {
720                 packet_write(1, "%s %s\n", sha1_to_hex(sha1), refname_nons);
721         }
722         capabilities = NULL;
723         if (!peel_ref(refname, peeled))
724                 packet_write(1, "%s %s^{}\n", sha1_to_hex(peeled), refname_nons);
725         return 0;
726 }
727
728 static int find_symref(const char *refname, const unsigned char *sha1, int flag,
729                        void *cb_data)
730 {
731         const char *symref_target;
732         struct string_list_item *item;
733         unsigned char unused[20];
734
735         if ((flag & REF_ISSYMREF) == 0)
736                 return 0;
737         symref_target = resolve_ref_unsafe(refname, unused, 0, &flag);
738         if (!symref_target || (flag & REF_ISSYMREF) == 0)
739                 die("'%s' is a symref but it is not?", refname);
740         item = string_list_append(cb_data, refname);
741         item->util = xstrdup(symref_target);
742         return 0;
743 }
744
745 static void upload_pack(void)
746 {
747         struct string_list symref = STRING_LIST_INIT_DUP;
748
749         head_ref_namespaced(find_symref, &symref);
750
751         if (advertise_refs || !stateless_rpc) {
752                 reset_timeout();
753                 head_ref_namespaced(send_ref, &symref);
754                 for_each_namespaced_ref(send_ref, &symref);
755                 advertise_shallow_grafts(1);
756                 packet_flush(1);
757         } else {
758                 head_ref_namespaced(mark_our_ref, NULL);
759                 for_each_namespaced_ref(mark_our_ref, NULL);
760         }
761         string_list_clear(&symref, 1);
762         if (advertise_refs)
763                 return;
764
765         receive_needs();
766         if (want_obj.nr) {
767                 get_common_commits();
768                 create_pack_file();
769         }
770 }
771
772 static int upload_pack_config(const char *var, const char *value, void *unused)
773 {
774         if (!strcmp("uploadpack.allowtipsha1inwant", var))
775                 allow_tip_sha1_in_want = git_config_bool(var, value);
776         else if (!strcmp("uploadpack.keepalive", var)) {
777                 keepalive = git_config_int(var, value);
778                 if (!keepalive)
779                         keepalive = -1;
780         }
781         return parse_hide_refs_config(var, value, "uploadpack");
782 }
783
784 int main(int argc, char **argv)
785 {
786         char *dir;
787         int i;
788         int strict = 0;
789
790         git_setup_gettext();
791
792         packet_trace_identity("upload-pack");
793         git_extract_argv0_path(argv[0]);
794         read_replace_refs = 0;
795
796         for (i = 1; i < argc; i++) {
797                 char *arg = argv[i];
798
799                 if (arg[0] != '-')
800                         break;
801                 if (!strcmp(arg, "--advertise-refs")) {
802                         advertise_refs = 1;
803                         continue;
804                 }
805                 if (!strcmp(arg, "--stateless-rpc")) {
806                         stateless_rpc = 1;
807                         continue;
808                 }
809                 if (!strcmp(arg, "--strict")) {
810                         strict = 1;
811                         continue;
812                 }
813                 if (starts_with(arg, "--timeout=")) {
814                         timeout = atoi(arg+10);
815                         daemon_mode = 1;
816                         continue;
817                 }
818                 if (!strcmp(arg, "--")) {
819                         i++;
820                         break;
821                 }
822         }
823
824         if (i != argc-1)
825                 usage(upload_pack_usage);
826
827         setup_path();
828
829         dir = argv[i];
830
831         if (!enter_repo(dir, strict))
832                 die("'%s' does not appear to be a git repository", dir);
833
834         git_config(upload_pack_config, NULL);
835         upload_pack();
836         return 0;
837 }