Merge branch 'maint'
[git] / builtin-fetch.c
1 /*
2  * "git fetch"
3  */
4 #include "cache.h"
5 #include "refs.h"
6 #include "commit.h"
7 #include "builtin.h"
8 #include "string-list.h"
9 #include "remote.h"
10 #include "transport.h"
11 #include "run-command.h"
12 #include "parse-options.h"
13
14 static const char * const builtin_fetch_usage[] = {
15         "git fetch [options] [<repository> <refspec>...]",
16         NULL
17 };
18
19 enum {
20         TAGS_UNSET = 0,
21         TAGS_DEFAULT = 1,
22         TAGS_SET = 2
23 };
24
25 static int append, force, keep, update_head_ok, verbosity;
26 static int tags = TAGS_DEFAULT;
27 static const char *depth;
28 static const char *upload_pack;
29 static struct strbuf default_rla = STRBUF_INIT;
30 static struct transport *transport;
31
32 static struct option builtin_fetch_options[] = {
33         OPT__VERBOSITY(&verbosity),
34         OPT_BOOLEAN('a', "append", &append,
35                     "append to .git/FETCH_HEAD instead of overwriting"),
36         OPT_STRING(0, "upload-pack", &upload_pack, "PATH",
37                    "path to upload pack on remote end"),
38         OPT_BOOLEAN('f', "force", &force,
39                     "force overwrite of local branch"),
40         OPT_SET_INT('t', "tags", &tags,
41                     "fetch all tags and associated objects", TAGS_SET),
42         OPT_SET_INT('n', NULL, &tags,
43                     "do not fetch all tags (--no-tags)", TAGS_UNSET),
44         OPT_BOOLEAN('k', "keep", &keep, "keep downloaded pack"),
45         OPT_BOOLEAN('u', "update-head-ok", &update_head_ok,
46                     "allow updating of HEAD ref"),
47         OPT_STRING(0, "depth", &depth, "DEPTH",
48                    "deepen history of shallow clone"),
49         OPT_END()
50 };
51
52 static void unlock_pack(void)
53 {
54         if (transport)
55                 transport_unlock_pack(transport);
56 }
57
58 static void unlock_pack_on_signal(int signo)
59 {
60         unlock_pack();
61         signal(SIGINT, SIG_DFL);
62         raise(signo);
63 }
64
65 static void add_merge_config(struct ref **head,
66                            const struct ref *remote_refs,
67                            struct branch *branch,
68                            struct ref ***tail)
69 {
70         int i;
71
72         for (i = 0; i < branch->merge_nr; i++) {
73                 struct ref *rm, **old_tail = *tail;
74                 struct refspec refspec;
75
76                 for (rm = *head; rm; rm = rm->next) {
77                         if (branch_merge_matches(branch, i, rm->name)) {
78                                 rm->merge = 1;
79                                 break;
80                         }
81                 }
82                 if (rm)
83                         continue;
84
85                 /*
86                  * Not fetched to a tracking branch?  We need to fetch
87                  * it anyway to allow this branch's "branch.$name.merge"
88                  * to be honored by 'git pull', but we do not have to
89                  * fail if branch.$name.merge is misconfigured to point
90                  * at a nonexisting branch.  If we were indeed called by
91                  * 'git pull', it will notice the misconfiguration because
92                  * there is no entry in the resulting FETCH_HEAD marked
93                  * for merging.
94                  */
95                 refspec.src = branch->merge[i]->src;
96                 refspec.dst = NULL;
97                 refspec.pattern = 0;
98                 refspec.force = 0;
99                 get_fetch_map(remote_refs, &refspec, tail, 1);
100                 for (rm = *old_tail; rm; rm = rm->next)
101                         rm->merge = 1;
102         }
103 }
104
105 static void find_non_local_tags(struct transport *transport,
106                         struct ref **head,
107                         struct ref ***tail);
108
109 static struct ref *get_ref_map(struct transport *transport,
110                                struct refspec *refs, int ref_count, int tags,
111                                int *autotags)
112 {
113         int i;
114         struct ref *rm;
115         struct ref *ref_map = NULL;
116         struct ref **tail = &ref_map;
117
118         const struct ref *remote_refs = transport_get_remote_refs(transport);
119
120         if (ref_count || tags == TAGS_SET) {
121                 for (i = 0; i < ref_count; i++) {
122                         get_fetch_map(remote_refs, &refs[i], &tail, 0);
123                         if (refs[i].dst && refs[i].dst[0])
124                                 *autotags = 1;
125                 }
126                 /* Merge everything on the command line, but not --tags */
127                 for (rm = ref_map; rm; rm = rm->next)
128                         rm->merge = 1;
129                 if (tags == TAGS_SET)
130                         get_fetch_map(remote_refs, tag_refspec, &tail, 0);
131         } else {
132                 /* Use the defaults */
133                 struct remote *remote = transport->remote;
134                 struct branch *branch = branch_get(NULL);
135                 int has_merge = branch_has_merge_config(branch);
136                 if (remote && (remote->fetch_refspec_nr || has_merge)) {
137                         for (i = 0; i < remote->fetch_refspec_nr; i++) {
138                                 get_fetch_map(remote_refs, &remote->fetch[i], &tail, 0);
139                                 if (remote->fetch[i].dst &&
140                                     remote->fetch[i].dst[0])
141                                         *autotags = 1;
142                                 if (!i && !has_merge && ref_map &&
143                                     !remote->fetch[0].pattern)
144                                         ref_map->merge = 1;
145                         }
146                         /*
147                          * if the remote we're fetching from is the same
148                          * as given in branch.<name>.remote, we add the
149                          * ref given in branch.<name>.merge, too.
150                          */
151                         if (has_merge &&
152                             !strcmp(branch->remote_name, remote->name))
153                                 add_merge_config(&ref_map, remote_refs, branch, &tail);
154                 } else {
155                         ref_map = get_remote_ref(remote_refs, "HEAD");
156                         if (!ref_map)
157                                 die("Couldn't find remote ref HEAD");
158                         ref_map->merge = 1;
159                         tail = &ref_map->next;
160                 }
161         }
162         if (tags == TAGS_DEFAULT && *autotags)
163                 find_non_local_tags(transport, &ref_map, &tail);
164         ref_remove_duplicates(ref_map);
165
166         return ref_map;
167 }
168
169 static int s_update_ref(const char *action,
170                         struct ref *ref,
171                         int check_old)
172 {
173         char msg[1024];
174         char *rla = getenv("GIT_REFLOG_ACTION");
175         static struct ref_lock *lock;
176
177         if (!rla)
178                 rla = default_rla.buf;
179         snprintf(msg, sizeof(msg), "%s: %s", rla, action);
180         lock = lock_any_ref_for_update(ref->name,
181                                        check_old ? ref->old_sha1 : NULL, 0);
182         if (!lock)
183                 return 2;
184         if (write_ref_sha1(lock, ref->new_sha1, msg) < 0)
185                 return 2;
186         return 0;
187 }
188
189 #define SUMMARY_WIDTH (2 * DEFAULT_ABBREV + 3)
190 #define REFCOL_WIDTH  10
191
192 static int update_local_ref(struct ref *ref,
193                             const char *remote,
194                             char *display)
195 {
196         struct commit *current = NULL, *updated;
197         enum object_type type;
198         struct branch *current_branch = branch_get(NULL);
199         const char *pretty_ref = ref->name + (
200                 !prefixcmp(ref->name, "refs/heads/") ? 11 :
201                 !prefixcmp(ref->name, "refs/tags/") ? 10 :
202                 !prefixcmp(ref->name, "refs/remotes/") ? 13 :
203                 0);
204
205         *display = 0;
206         type = sha1_object_info(ref->new_sha1, NULL);
207         if (type < 0)
208                 die("object %s not found", sha1_to_hex(ref->new_sha1));
209
210         if (!hashcmp(ref->old_sha1, ref->new_sha1)) {
211                 if (verbosity > 0)
212                         sprintf(display, "= %-*s %-*s -> %s", SUMMARY_WIDTH,
213                                 "[up to date]", REFCOL_WIDTH, remote,
214                                 pretty_ref);
215                 return 0;
216         }
217
218         if (current_branch &&
219             !strcmp(ref->name, current_branch->name) &&
220             !(update_head_ok || is_bare_repository()) &&
221             !is_null_sha1(ref->old_sha1)) {
222                 /*
223                  * If this is the head, and it's not okay to update
224                  * the head, and the old value of the head isn't empty...
225                  */
226                 sprintf(display, "! %-*s %-*s -> %s  (can't fetch in current branch)",
227                         SUMMARY_WIDTH, "[rejected]", REFCOL_WIDTH, remote,
228                         pretty_ref);
229                 return 1;
230         }
231
232         if (!is_null_sha1(ref->old_sha1) &&
233             !prefixcmp(ref->name, "refs/tags/")) {
234                 int r;
235                 r = s_update_ref("updating tag", ref, 0);
236                 sprintf(display, "%c %-*s %-*s -> %s%s", r ? '!' : '-',
237                         SUMMARY_WIDTH, "[tag update]", REFCOL_WIDTH, remote,
238                         pretty_ref, r ? "  (unable to update local ref)" : "");
239                 return r;
240         }
241
242         current = lookup_commit_reference_gently(ref->old_sha1, 1);
243         updated = lookup_commit_reference_gently(ref->new_sha1, 1);
244         if (!current || !updated) {
245                 const char *msg;
246                 const char *what;
247                 int r;
248                 if (!strncmp(ref->name, "refs/tags/", 10)) {
249                         msg = "storing tag";
250                         what = "[new tag]";
251                 }
252                 else {
253                         msg = "storing head";
254                         what = "[new branch]";
255                 }
256
257                 r = s_update_ref(msg, ref, 0);
258                 sprintf(display, "%c %-*s %-*s -> %s%s", r ? '!' : '*',
259                         SUMMARY_WIDTH, what, REFCOL_WIDTH, remote, pretty_ref,
260                         r ? "  (unable to update local ref)" : "");
261                 return r;
262         }
263
264         if (in_merge_bases(current, &updated, 1)) {
265                 char quickref[83];
266                 int r;
267                 strcpy(quickref, find_unique_abbrev(current->object.sha1, DEFAULT_ABBREV));
268                 strcat(quickref, "..");
269                 strcat(quickref, find_unique_abbrev(ref->new_sha1, DEFAULT_ABBREV));
270                 r = s_update_ref("fast forward", ref, 1);
271                 sprintf(display, "%c %-*s %-*s -> %s%s", r ? '!' : ' ',
272                         SUMMARY_WIDTH, quickref, REFCOL_WIDTH, remote,
273                         pretty_ref, r ? "  (unable to update local ref)" : "");
274                 return r;
275         } else if (force || ref->force) {
276                 char quickref[84];
277                 int r;
278                 strcpy(quickref, find_unique_abbrev(current->object.sha1, DEFAULT_ABBREV));
279                 strcat(quickref, "...");
280                 strcat(quickref, find_unique_abbrev(ref->new_sha1, DEFAULT_ABBREV));
281                 r = s_update_ref("forced-update", ref, 1);
282                 sprintf(display, "%c %-*s %-*s -> %s  (%s)", r ? '!' : '+',
283                         SUMMARY_WIDTH, quickref, REFCOL_WIDTH, remote,
284                         pretty_ref,
285                         r ? "unable to update local ref" : "forced update");
286                 return r;
287         } else {
288                 sprintf(display, "! %-*s %-*s -> %s  (non fast forward)",
289                         SUMMARY_WIDTH, "[rejected]", REFCOL_WIDTH, remote,
290                         pretty_ref);
291                 return 1;
292         }
293 }
294
295 static int store_updated_refs(const char *url, const char *remote_name,
296                 struct ref *ref_map)
297 {
298         FILE *fp;
299         struct commit *commit;
300         int url_len, i, note_len, shown_url = 0, rc = 0;
301         char note[1024];
302         const char *what, *kind;
303         struct ref *rm;
304         char *filename = git_path("FETCH_HEAD");
305
306         fp = fopen(filename, "a");
307         if (!fp)
308                 return error("cannot open %s: %s\n", filename, strerror(errno));
309         for (rm = ref_map; rm; rm = rm->next) {
310                 struct ref *ref = NULL;
311
312                 if (rm->peer_ref) {
313                         ref = xcalloc(1, sizeof(*ref) + strlen(rm->peer_ref->name) + 1);
314                         strcpy(ref->name, rm->peer_ref->name);
315                         hashcpy(ref->old_sha1, rm->peer_ref->old_sha1);
316                         hashcpy(ref->new_sha1, rm->old_sha1);
317                         ref->force = rm->peer_ref->force;
318                 }
319
320                 commit = lookup_commit_reference_gently(rm->old_sha1, 1);
321                 if (!commit)
322                         rm->merge = 0;
323
324                 if (!strcmp(rm->name, "HEAD")) {
325                         kind = "";
326                         what = "";
327                 }
328                 else if (!prefixcmp(rm->name, "refs/heads/")) {
329                         kind = "branch";
330                         what = rm->name + 11;
331                 }
332                 else if (!prefixcmp(rm->name, "refs/tags/")) {
333                         kind = "tag";
334                         what = rm->name + 10;
335                 }
336                 else if (!prefixcmp(rm->name, "refs/remotes/")) {
337                         kind = "remote branch";
338                         what = rm->name + 13;
339                 }
340                 else {
341                         kind = "";
342                         what = rm->name;
343                 }
344
345                 url_len = strlen(url);
346                 for (i = url_len - 1; url[i] == '/' && 0 <= i; i--)
347                         ;
348                 url_len = i + 1;
349                 if (4 < i && !strncmp(".git", url + i - 3, 4))
350                         url_len = i - 3;
351
352                 note_len = 0;
353                 if (*what) {
354                         if (*kind)
355                                 note_len += sprintf(note + note_len, "%s ",
356                                                     kind);
357                         note_len += sprintf(note + note_len, "'%s' of ", what);
358                 }
359                 note_len += sprintf(note + note_len, "%.*s", url_len, url);
360                 fprintf(fp, "%s\t%s\t%s\n",
361                         sha1_to_hex(commit ? commit->object.sha1 :
362                                     rm->old_sha1),
363                         rm->merge ? "" : "not-for-merge",
364                         note);
365
366                 if (ref)
367                         rc |= update_local_ref(ref, what, note);
368                 else
369                         sprintf(note, "* %-*s %-*s -> FETCH_HEAD",
370                                 SUMMARY_WIDTH, *kind ? kind : "branch",
371                                  REFCOL_WIDTH, *what ? what : "HEAD");
372                 if (*note) {
373                         if (verbosity >= 0 && !shown_url) {
374                                 fprintf(stderr, "From %.*s\n",
375                                                 url_len, url);
376                                 shown_url = 1;
377                         }
378                         if (verbosity >= 0)
379                                 fprintf(stderr, " %s\n", note);
380                 }
381         }
382         fclose(fp);
383         if (rc & 2)
384                 error("some local refs could not be updated; try running\n"
385                       " 'git remote prune %s' to remove any old, conflicting "
386                       "branches", remote_name);
387         return rc;
388 }
389
390 /*
391  * We would want to bypass the object transfer altogether if
392  * everything we are going to fetch already exists and connected
393  * locally.
394  *
395  * The refs we are going to fetch are in to_fetch (nr_heads in
396  * total).  If running
397  *
398  *  $ git rev-list --objects to_fetch[0] to_fetch[1] ... --not --all
399  *
400  * does not error out, that means everything reachable from the
401  * refs we are going to fetch exists and is connected to some of
402  * our existing refs.
403  */
404 static int quickfetch(struct ref *ref_map)
405 {
406         struct child_process revlist;
407         struct ref *ref;
408         char **argv;
409         int i, err;
410
411         /*
412          * If we are deepening a shallow clone we already have these
413          * objects reachable.  Running rev-list here will return with
414          * a good (0) exit status and we'll bypass the fetch that we
415          * really need to perform.  Claiming failure now will ensure
416          * we perform the network exchange to deepen our history.
417          */
418         if (depth)
419                 return -1;
420
421         for (i = 0, ref = ref_map; ref; ref = ref->next)
422                 i++;
423         if (!i)
424                 return 0;
425
426         argv = xmalloc(sizeof(*argv) * (i + 6));
427         i = 0;
428         argv[i++] = xstrdup("rev-list");
429         argv[i++] = xstrdup("--quiet");
430         argv[i++] = xstrdup("--objects");
431         for (ref = ref_map; ref; ref = ref->next)
432                 argv[i++] = xstrdup(sha1_to_hex(ref->old_sha1));
433         argv[i++] = xstrdup("--not");
434         argv[i++] = xstrdup("--all");
435         argv[i++] = NULL;
436
437         memset(&revlist, 0, sizeof(revlist));
438         revlist.argv = (const char**)argv;
439         revlist.git_cmd = 1;
440         revlist.no_stdin = 1;
441         revlist.no_stdout = 1;
442         revlist.no_stderr = 1;
443         err = run_command(&revlist);
444
445         for (i = 0; argv[i]; i++)
446                 free(argv[i]);
447         free(argv);
448         return err;
449 }
450
451 static int fetch_refs(struct transport *transport, struct ref *ref_map)
452 {
453         int ret = quickfetch(ref_map);
454         if (ret)
455                 ret = transport_fetch_refs(transport, ref_map);
456         if (!ret)
457                 ret |= store_updated_refs(transport->url,
458                                 transport->remote->name,
459                                 ref_map);
460         transport_unlock_pack(transport);
461         return ret;
462 }
463
464 static int add_existing(const char *refname, const unsigned char *sha1,
465                         int flag, void *cbdata)
466 {
467         struct string_list *list = (struct string_list *)cbdata;
468         string_list_insert(refname, list);
469         return 0;
470 }
471
472 static int will_fetch(struct ref **head, const unsigned char *sha1)
473 {
474         struct ref *rm = *head;
475         while (rm) {
476                 if (!hashcmp(rm->old_sha1, sha1))
477                         return 1;
478                 rm = rm->next;
479         }
480         return 0;
481 }
482
483 static void find_non_local_tags(struct transport *transport,
484                         struct ref **head,
485                         struct ref ***tail)
486 {
487         struct string_list existing_refs = { NULL, 0, 0, 0 };
488         struct string_list new_refs = { NULL, 0, 0, 1 };
489         char *ref_name;
490         int ref_name_len;
491         const unsigned char *ref_sha1;
492         const struct ref *tag_ref;
493         struct ref *rm = NULL;
494         const struct ref *ref;
495
496         for_each_ref(add_existing, &existing_refs);
497         for (ref = transport_get_remote_refs(transport); ref; ref = ref->next) {
498                 if (prefixcmp(ref->name, "refs/tags"))
499                         continue;
500
501                 ref_name = xstrdup(ref->name);
502                 ref_name_len = strlen(ref_name);
503                 ref_sha1 = ref->old_sha1;
504
505                 if (!strcmp(ref_name + ref_name_len - 3, "^{}")) {
506                         ref_name[ref_name_len - 3] = 0;
507                         tag_ref = transport_get_remote_refs(transport);
508                         while (tag_ref) {
509                                 if (!strcmp(tag_ref->name, ref_name)) {
510                                         ref_sha1 = tag_ref->old_sha1;
511                                         break;
512                                 }
513                                 tag_ref = tag_ref->next;
514                         }
515                 }
516
517                 if (!string_list_has_string(&existing_refs, ref_name) &&
518                     !string_list_has_string(&new_refs, ref_name) &&
519                     (has_sha1_file(ref->old_sha1) ||
520                      will_fetch(head, ref->old_sha1))) {
521                         string_list_insert(ref_name, &new_refs);
522
523                         rm = alloc_ref(ref_name);
524                         rm->peer_ref = alloc_ref(ref_name);
525                         hashcpy(rm->old_sha1, ref_sha1);
526
527                         **tail = rm;
528                         *tail = &rm->next;
529                 }
530                 free(ref_name);
531         }
532         string_list_clear(&existing_refs, 0);
533         string_list_clear(&new_refs, 0);
534 }
535
536 static void check_not_current_branch(struct ref *ref_map)
537 {
538         struct branch *current_branch = branch_get(NULL);
539
540         if (is_bare_repository() || !current_branch)
541                 return;
542
543         for (; ref_map; ref_map = ref_map->next)
544                 if (ref_map->peer_ref && !strcmp(current_branch->refname,
545                                         ref_map->peer_ref->name))
546                         die("Refusing to fetch into current branch");
547 }
548
549 static int do_fetch(struct transport *transport,
550                     struct refspec *refs, int ref_count)
551 {
552         struct ref *ref_map;
553         struct ref *rm;
554         int autotags = (transport->remote->fetch_tags == 1);
555         if (transport->remote->fetch_tags == 2 && tags != TAGS_UNSET)
556                 tags = TAGS_SET;
557         if (transport->remote->fetch_tags == -1)
558                 tags = TAGS_UNSET;
559
560         if (!transport->get_refs_list || !transport->fetch)
561                 die("Don't know how to fetch from %s", transport->url);
562
563         /* if not appending, truncate FETCH_HEAD */
564         if (!append) {
565                 char *filename = git_path("FETCH_HEAD");
566                 FILE *fp = fopen(filename, "w");
567                 if (!fp)
568                         return error("cannot open %s: %s\n", filename, strerror(errno));
569                 fclose(fp);
570         }
571
572         ref_map = get_ref_map(transport, refs, ref_count, tags, &autotags);
573         if (!update_head_ok)
574                 check_not_current_branch(ref_map);
575
576         for (rm = ref_map; rm; rm = rm->next) {
577                 if (rm->peer_ref)
578                         read_ref(rm->peer_ref->name, rm->peer_ref->old_sha1);
579         }
580
581         if (tags == TAGS_DEFAULT && autotags)
582                 transport_set_option(transport, TRANS_OPT_FOLLOWTAGS, "1");
583         if (fetch_refs(transport, ref_map)) {
584                 free_refs(ref_map);
585                 return 1;
586         }
587         free_refs(ref_map);
588
589         /* if neither --no-tags nor --tags was specified, do automated tag
590          * following ... */
591         if (tags == TAGS_DEFAULT && autotags) {
592                 struct ref **tail = &ref_map;
593                 ref_map = NULL;
594                 find_non_local_tags(transport, &ref_map, &tail);
595                 if (ref_map) {
596                         transport_set_option(transport, TRANS_OPT_FOLLOWTAGS, NULL);
597                         transport_set_option(transport, TRANS_OPT_DEPTH, "0");
598                         fetch_refs(transport, ref_map);
599                 }
600                 free_refs(ref_map);
601         }
602
603         return 0;
604 }
605
606 static void set_option(const char *name, const char *value)
607 {
608         int r = transport_set_option(transport, name, value);
609         if (r < 0)
610                 die("Option \"%s\" value \"%s\" is not valid for %s",
611                         name, value, transport->url);
612         if (r > 0)
613                 warning("Option \"%s\" is ignored for %s\n",
614                         name, transport->url);
615 }
616
617 int cmd_fetch(int argc, const char **argv, const char *prefix)
618 {
619         struct remote *remote;
620         int i;
621         static const char **refs = NULL;
622         int ref_nr = 0;
623         int exit_code;
624
625         /* Record the command line for the reflog */
626         strbuf_addstr(&default_rla, "fetch");
627         for (i = 1; i < argc; i++)
628                 strbuf_addf(&default_rla, " %s", argv[i]);
629
630         argc = parse_options(argc, argv,
631                              builtin_fetch_options, builtin_fetch_usage, 0);
632
633         if (argc == 0)
634                 remote = remote_get(NULL);
635         else
636                 remote = remote_get(argv[0]);
637
638         transport = transport_get(remote, remote->url[0]);
639         if (verbosity >= 2)
640                 transport->verbose = 1;
641         if (verbosity < 0)
642                 transport->verbose = -1;
643         if (upload_pack)
644                 set_option(TRANS_OPT_UPLOADPACK, upload_pack);
645         if (keep)
646                 set_option(TRANS_OPT_KEEP, "yes");
647         if (depth)
648                 set_option(TRANS_OPT_DEPTH, depth);
649
650         if (!transport->url)
651                 die("Where do you want to fetch from today?");
652
653         if (argc > 1) {
654                 int j = 0;
655                 refs = xcalloc(argc + 1, sizeof(const char *));
656                 for (i = 1; i < argc; i++) {
657                         if (!strcmp(argv[i], "tag")) {
658                                 char *ref;
659                                 i++;
660                                 if (i >= argc)
661                                         die("You need to specify a tag name.");
662                                 ref = xmalloc(strlen(argv[i]) * 2 + 22);
663                                 strcpy(ref, "refs/tags/");
664                                 strcat(ref, argv[i]);
665                                 strcat(ref, ":refs/tags/");
666                                 strcat(ref, argv[i]);
667                                 refs[j++] = ref;
668                         } else
669                                 refs[j++] = argv[i];
670                 }
671                 refs[j] = NULL;
672                 ref_nr = j;
673         }
674
675         signal(SIGINT, unlock_pack_on_signal);
676         atexit(unlock_pack);
677         exit_code = do_fetch(transport,
678                         parse_fetch_refspec(ref_nr, refs), ref_nr);
679         transport_disconnect(transport);
680         transport = NULL;
681         return exit_code;
682 }