Merge branch 'jw/format-patch-attach'
[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 #include "sigchain.h"
14
15 static const char * const builtin_fetch_usage[] = {
16         "git fetch [options] [<repository> <refspec>...]",
17         NULL
18 };
19
20 enum {
21         TAGS_UNSET = 0,
22         TAGS_DEFAULT = 1,
23         TAGS_SET = 2
24 };
25
26 static int append, force, keep, update_head_ok, verbosity;
27 static int tags = TAGS_DEFAULT;
28 static const char *depth;
29 static const char *upload_pack;
30 static struct strbuf default_rla = STRBUF_INIT;
31 static struct transport *transport;
32
33 static struct option builtin_fetch_options[] = {
34         OPT__VERBOSITY(&verbosity),
35         OPT_BOOLEAN('a', "append", &append,
36                     "append to .git/FETCH_HEAD instead of overwriting"),
37         OPT_STRING(0, "upload-pack", &upload_pack, "PATH",
38                    "path to upload pack on remote end"),
39         OPT_BOOLEAN('f', "force", &force,
40                     "force overwrite of local branch"),
41         OPT_SET_INT('t', "tags", &tags,
42                     "fetch all tags and associated objects", TAGS_SET),
43         OPT_SET_INT('n', NULL, &tags,
44                     "do not fetch all tags (--no-tags)", TAGS_UNSET),
45         OPT_BOOLEAN('k', "keep", &keep, "keep downloaded pack"),
46         OPT_BOOLEAN('u', "update-head-ok", &update_head_ok,
47                     "allow updating of HEAD ref"),
48         OPT_STRING(0, "depth", &depth, "DEPTH",
49                    "deepen history of shallow clone"),
50         OPT_END()
51 };
52
53 static void unlock_pack(void)
54 {
55         if (transport)
56                 transport_unlock_pack(transport);
57 }
58
59 static void unlock_pack_on_signal(int signo)
60 {
61         unlock_pack();
62         sigchain_pop(signo);
63         raise(signo);
64 }
65
66 static void add_merge_config(struct ref **head,
67                            const struct ref *remote_refs,
68                            struct branch *branch,
69                            struct ref ***tail)
70 {
71         int i;
72
73         for (i = 0; i < branch->merge_nr; i++) {
74                 struct ref *rm, **old_tail = *tail;
75                 struct refspec refspec;
76
77                 for (rm = *head; rm; rm = rm->next) {
78                         if (branch_merge_matches(branch, i, rm->name)) {
79                                 rm->merge = 1;
80                                 break;
81                         }
82                 }
83                 if (rm)
84                         continue;
85
86                 /*
87                  * Not fetched to a tracking branch?  We need to fetch
88                  * it anyway to allow this branch's "branch.$name.merge"
89                  * to be honored by 'git pull', but we do not have to
90                  * fail if branch.$name.merge is misconfigured to point
91                  * at a nonexisting branch.  If we were indeed called by
92                  * 'git pull', it will notice the misconfiguration because
93                  * there is no entry in the resulting FETCH_HEAD marked
94                  * for merging.
95                  */
96                 refspec.src = branch->merge[i]->src;
97                 refspec.dst = NULL;
98                 refspec.pattern = 0;
99                 refspec.force = 0;
100                 get_fetch_map(remote_refs, &refspec, tail, 1);
101                 for (rm = *old_tail; rm; rm = rm->next)
102                         rm->merge = 1;
103         }
104 }
105
106 static void find_non_local_tags(struct transport *transport,
107                         struct ref **head,
108                         struct ref ***tail);
109
110 static struct ref *get_ref_map(struct transport *transport,
111                                struct refspec *refs, int ref_count, int tags,
112                                int *autotags)
113 {
114         int i;
115         struct ref *rm;
116         struct ref *ref_map = NULL;
117         struct ref **tail = &ref_map;
118
119         const struct ref *remote_refs = transport_get_remote_refs(transport);
120
121         if (ref_count || tags == TAGS_SET) {
122                 for (i = 0; i < ref_count; i++) {
123                         get_fetch_map(remote_refs, &refs[i], &tail, 0);
124                         if (refs[i].dst && refs[i].dst[0])
125                                 *autotags = 1;
126                 }
127                 /* Merge everything on the command line, but not --tags */
128                 for (rm = ref_map; rm; rm = rm->next)
129                         rm->merge = 1;
130                 if (tags == TAGS_SET)
131                         get_fetch_map(remote_refs, tag_refspec, &tail, 0);
132         } else {
133                 /* Use the defaults */
134                 struct remote *remote = transport->remote;
135                 struct branch *branch = branch_get(NULL);
136                 int has_merge = branch_has_merge_config(branch);
137                 if (remote && (remote->fetch_refspec_nr || has_merge)) {
138                         for (i = 0; i < remote->fetch_refspec_nr; i++) {
139                                 get_fetch_map(remote_refs, &remote->fetch[i], &tail, 0);
140                                 if (remote->fetch[i].dst &&
141                                     remote->fetch[i].dst[0])
142                                         *autotags = 1;
143                                 if (!i && !has_merge && ref_map &&
144                                     !remote->fetch[0].pattern)
145                                         ref_map->merge = 1;
146                         }
147                         /*
148                          * if the remote we're fetching from is the same
149                          * as given in branch.<name>.remote, we add the
150                          * ref given in branch.<name>.merge, too.
151                          */
152                         if (has_merge &&
153                             !strcmp(branch->remote_name, remote->name))
154                                 add_merge_config(&ref_map, remote_refs, branch, &tail);
155                 } else {
156                         ref_map = get_remote_ref(remote_refs, "HEAD");
157                         if (!ref_map)
158                                 die("Couldn't find remote ref HEAD");
159                         ref_map->merge = 1;
160                         tail = &ref_map->next;
161                 }
162         }
163         if (tags == TAGS_DEFAULT && *autotags)
164                 find_non_local_tags(transport, &ref_map, &tail);
165         ref_remove_duplicates(ref_map);
166
167         return ref_map;
168 }
169
170 static int s_update_ref(const char *action,
171                         struct ref *ref,
172                         int check_old)
173 {
174         char msg[1024];
175         char *rla = getenv("GIT_REFLOG_ACTION");
176         static struct ref_lock *lock;
177
178         if (!rla)
179                 rla = default_rla.buf;
180         snprintf(msg, sizeof(msg), "%s: %s", rla, action);
181         lock = lock_any_ref_for_update(ref->name,
182                                        check_old ? ref->old_sha1 : NULL, 0);
183         if (!lock)
184                 return 2;
185         if (write_ref_sha1(lock, ref->new_sha1, msg) < 0)
186                 return 2;
187         return 0;
188 }
189
190 #define SUMMARY_WIDTH (2 * DEFAULT_ABBREV + 3)
191 #define REFCOL_WIDTH  10
192
193 static int update_local_ref(struct ref *ref,
194                             const char *remote,
195                             char *display)
196 {
197         struct commit *current = NULL, *updated;
198         enum object_type type;
199         struct branch *current_branch = branch_get(NULL);
200         const char *pretty_ref = ref->name + (
201                 !prefixcmp(ref->name, "refs/heads/") ? 11 :
202                 !prefixcmp(ref->name, "refs/tags/") ? 10 :
203                 !prefixcmp(ref->name, "refs/remotes/") ? 13 :
204                 0);
205
206         *display = 0;
207         type = sha1_object_info(ref->new_sha1, NULL);
208         if (type < 0)
209                 die("object %s not found", sha1_to_hex(ref->new_sha1));
210
211         if (!hashcmp(ref->old_sha1, ref->new_sha1)) {
212                 if (verbosity > 0)
213                         sprintf(display, "= %-*s %-*s -> %s", SUMMARY_WIDTH,
214                                 "[up to date]", REFCOL_WIDTH, remote,
215                                 pretty_ref);
216                 return 0;
217         }
218
219         if (current_branch &&
220             !strcmp(ref->name, current_branch->name) &&
221             !(update_head_ok || is_bare_repository()) &&
222             !is_null_sha1(ref->old_sha1)) {
223                 /*
224                  * If this is the head, and it's not okay to update
225                  * the head, and the old value of the head isn't empty...
226                  */
227                 sprintf(display, "! %-*s %-*s -> %s  (can't fetch in current branch)",
228                         SUMMARY_WIDTH, "[rejected]", REFCOL_WIDTH, remote,
229                         pretty_ref);
230                 return 1;
231         }
232
233         if (!is_null_sha1(ref->old_sha1) &&
234             !prefixcmp(ref->name, "refs/tags/")) {
235                 int r;
236                 r = s_update_ref("updating tag", ref, 0);
237                 sprintf(display, "%c %-*s %-*s -> %s%s", r ? '!' : '-',
238                         SUMMARY_WIDTH, "[tag update]", REFCOL_WIDTH, remote,
239                         pretty_ref, r ? "  (unable to update local ref)" : "");
240                 return r;
241         }
242
243         current = lookup_commit_reference_gently(ref->old_sha1, 1);
244         updated = lookup_commit_reference_gently(ref->new_sha1, 1);
245         if (!current || !updated) {
246                 const char *msg;
247                 const char *what;
248                 int r;
249                 if (!strncmp(ref->name, "refs/tags/", 10)) {
250                         msg = "storing tag";
251                         what = "[new tag]";
252                 }
253                 else {
254                         msg = "storing head";
255                         what = "[new branch]";
256                 }
257
258                 r = s_update_ref(msg, ref, 0);
259                 sprintf(display, "%c %-*s %-*s -> %s%s", r ? '!' : '*',
260                         SUMMARY_WIDTH, what, REFCOL_WIDTH, remote, pretty_ref,
261                         r ? "  (unable to update local ref)" : "");
262                 return r;
263         }
264
265         if (in_merge_bases(current, &updated, 1)) {
266                 char quickref[83];
267                 int r;
268                 strcpy(quickref, find_unique_abbrev(current->object.sha1, DEFAULT_ABBREV));
269                 strcat(quickref, "..");
270                 strcat(quickref, find_unique_abbrev(ref->new_sha1, DEFAULT_ABBREV));
271                 r = s_update_ref("fast forward", ref, 1);
272                 sprintf(display, "%c %-*s %-*s -> %s%s", r ? '!' : ' ',
273                         SUMMARY_WIDTH, quickref, REFCOL_WIDTH, remote,
274                         pretty_ref, r ? "  (unable to update local ref)" : "");
275                 return r;
276         } else if (force || ref->force) {
277                 char quickref[84];
278                 int r;
279                 strcpy(quickref, find_unique_abbrev(current->object.sha1, DEFAULT_ABBREV));
280                 strcat(quickref, "...");
281                 strcat(quickref, find_unique_abbrev(ref->new_sha1, DEFAULT_ABBREV));
282                 r = s_update_ref("forced-update", ref, 1);
283                 sprintf(display, "%c %-*s %-*s -> %s  (%s)", r ? '!' : '+',
284                         SUMMARY_WIDTH, quickref, REFCOL_WIDTH, remote,
285                         pretty_ref,
286                         r ? "unable to update local ref" : "forced update");
287                 return r;
288         } else {
289                 sprintf(display, "! %-*s %-*s -> %s  (non fast forward)",
290                         SUMMARY_WIDTH, "[rejected]", REFCOL_WIDTH, remote,
291                         pretty_ref);
292                 return 1;
293         }
294 }
295
296 static int store_updated_refs(const char *url, const char *remote_name,
297                 struct ref *ref_map)
298 {
299         FILE *fp;
300         struct commit *commit;
301         int url_len, i, note_len, shown_url = 0, rc = 0;
302         char note[1024];
303         const char *what, *kind;
304         struct ref *rm;
305         char *filename = git_path("FETCH_HEAD");
306
307         fp = fopen(filename, "a");
308         if (!fp)
309                 return error("cannot open %s: %s\n", filename, strerror(errno));
310         for (rm = ref_map; rm; rm = rm->next) {
311                 struct ref *ref = NULL;
312
313                 if (rm->peer_ref) {
314                         ref = xcalloc(1, sizeof(*ref) + strlen(rm->peer_ref->name) + 1);
315                         strcpy(ref->name, rm->peer_ref->name);
316                         hashcpy(ref->old_sha1, rm->peer_ref->old_sha1);
317                         hashcpy(ref->new_sha1, rm->old_sha1);
318                         ref->force = rm->peer_ref->force;
319                 }
320
321                 commit = lookup_commit_reference_gently(rm->old_sha1, 1);
322                 if (!commit)
323                         rm->merge = 0;
324
325                 if (!strcmp(rm->name, "HEAD")) {
326                         kind = "";
327                         what = "";
328                 }
329                 else if (!prefixcmp(rm->name, "refs/heads/")) {
330                         kind = "branch";
331                         what = rm->name + 11;
332                 }
333                 else if (!prefixcmp(rm->name, "refs/tags/")) {
334                         kind = "tag";
335                         what = rm->name + 10;
336                 }
337                 else if (!prefixcmp(rm->name, "refs/remotes/")) {
338                         kind = "remote branch";
339                         what = rm->name + 13;
340                 }
341                 else {
342                         kind = "";
343                         what = rm->name;
344                 }
345
346                 url_len = strlen(url);
347                 for (i = url_len - 1; url[i] == '/' && 0 <= i; i--)
348                         ;
349                 url_len = i + 1;
350                 if (4 < i && !strncmp(".git", url + i - 3, 4))
351                         url_len = i - 3;
352
353                 note_len = 0;
354                 if (*what) {
355                         if (*kind)
356                                 note_len += sprintf(note + note_len, "%s ",
357                                                     kind);
358                         note_len += sprintf(note + note_len, "'%s' of ", what);
359                 }
360                 note_len += sprintf(note + note_len, "%.*s", url_len, url);
361                 fprintf(fp, "%s\t%s\t%s\n",
362                         sha1_to_hex(commit ? commit->object.sha1 :
363                                     rm->old_sha1),
364                         rm->merge ? "" : "not-for-merge",
365                         note);
366
367                 if (ref)
368                         rc |= update_local_ref(ref, what, note);
369                 else
370                         sprintf(note, "* %-*s %-*s -> FETCH_HEAD",
371                                 SUMMARY_WIDTH, *kind ? kind : "branch",
372                                  REFCOL_WIDTH, *what ? what : "HEAD");
373                 if (*note) {
374                         if (verbosity >= 0 && !shown_url) {
375                                 fprintf(stderr, "From %.*s\n",
376                                                 url_len, url);
377                                 shown_url = 1;
378                         }
379                         if (verbosity >= 0)
380                                 fprintf(stderr, " %s\n", note);
381                 }
382         }
383         fclose(fp);
384         if (rc & 2)
385                 error("some local refs could not be updated; try running\n"
386                       " 'git remote prune %s' to remove any old, conflicting "
387                       "branches", remote_name);
388         return rc;
389 }
390
391 /*
392  * We would want to bypass the object transfer altogether if
393  * everything we are going to fetch already exists and connected
394  * locally.
395  *
396  * The refs we are going to fetch are in to_fetch (nr_heads in
397  * total).  If running
398  *
399  *  $ git rev-list --objects to_fetch[0] to_fetch[1] ... --not --all
400  *
401  * does not error out, that means everything reachable from the
402  * refs we are going to fetch exists and is connected to some of
403  * our existing refs.
404  */
405 static int quickfetch(struct ref *ref_map)
406 {
407         struct child_process revlist;
408         struct ref *ref;
409         char **argv;
410         int i, err;
411
412         /*
413          * If we are deepening a shallow clone we already have these
414          * objects reachable.  Running rev-list here will return with
415          * a good (0) exit status and we'll bypass the fetch that we
416          * really need to perform.  Claiming failure now will ensure
417          * we perform the network exchange to deepen our history.
418          */
419         if (depth)
420                 return -1;
421
422         for (i = 0, ref = ref_map; ref; ref = ref->next)
423                 i++;
424         if (!i)
425                 return 0;
426
427         argv = xmalloc(sizeof(*argv) * (i + 6));
428         i = 0;
429         argv[i++] = xstrdup("rev-list");
430         argv[i++] = xstrdup("--quiet");
431         argv[i++] = xstrdup("--objects");
432         for (ref = ref_map; ref; ref = ref->next)
433                 argv[i++] = xstrdup(sha1_to_hex(ref->old_sha1));
434         argv[i++] = xstrdup("--not");
435         argv[i++] = xstrdup("--all");
436         argv[i++] = NULL;
437
438         memset(&revlist, 0, sizeof(revlist));
439         revlist.argv = (const char**)argv;
440         revlist.git_cmd = 1;
441         revlist.no_stdin = 1;
442         revlist.no_stdout = 1;
443         revlist.no_stderr = 1;
444         err = run_command(&revlist);
445
446         for (i = 0; argv[i]; i++)
447                 free(argv[i]);
448         free(argv);
449         return err;
450 }
451
452 static int fetch_refs(struct transport *transport, struct ref *ref_map)
453 {
454         int ret = quickfetch(ref_map);
455         if (ret)
456                 ret = transport_fetch_refs(transport, ref_map);
457         if (!ret)
458                 ret |= store_updated_refs(transport->url,
459                                 transport->remote->name,
460                                 ref_map);
461         transport_unlock_pack(transport);
462         return ret;
463 }
464
465 static int add_existing(const char *refname, const unsigned char *sha1,
466                         int flag, void *cbdata)
467 {
468         struct string_list *list = (struct string_list *)cbdata;
469         string_list_insert(refname, list);
470         return 0;
471 }
472
473 static int will_fetch(struct ref **head, const unsigned char *sha1)
474 {
475         struct ref *rm = *head;
476         while (rm) {
477                 if (!hashcmp(rm->old_sha1, sha1))
478                         return 1;
479                 rm = rm->next;
480         }
481         return 0;
482 }
483
484 static void find_non_local_tags(struct transport *transport,
485                         struct ref **head,
486                         struct ref ***tail)
487 {
488         struct string_list existing_refs = { NULL, 0, 0, 0 };
489         struct string_list new_refs = { NULL, 0, 0, 1 };
490         char *ref_name;
491         int ref_name_len;
492         const unsigned char *ref_sha1;
493         const struct ref *tag_ref;
494         struct ref *rm = NULL;
495         const struct ref *ref;
496
497         for_each_ref(add_existing, &existing_refs);
498         for (ref = transport_get_remote_refs(transport); ref; ref = ref->next) {
499                 if (prefixcmp(ref->name, "refs/tags"))
500                         continue;
501
502                 ref_name = xstrdup(ref->name);
503                 ref_name_len = strlen(ref_name);
504                 ref_sha1 = ref->old_sha1;
505
506                 if (!strcmp(ref_name + ref_name_len - 3, "^{}")) {
507                         ref_name[ref_name_len - 3] = 0;
508                         tag_ref = transport_get_remote_refs(transport);
509                         while (tag_ref) {
510                                 if (!strcmp(tag_ref->name, ref_name)) {
511                                         ref_sha1 = tag_ref->old_sha1;
512                                         break;
513                                 }
514                                 tag_ref = tag_ref->next;
515                         }
516                 }
517
518                 if (!string_list_has_string(&existing_refs, ref_name) &&
519                     !string_list_has_string(&new_refs, ref_name) &&
520                     (has_sha1_file(ref->old_sha1) ||
521                      will_fetch(head, ref->old_sha1))) {
522                         string_list_insert(ref_name, &new_refs);
523
524                         rm = alloc_ref(ref_name);
525                         rm->peer_ref = alloc_ref(ref_name);
526                         hashcpy(rm->old_sha1, ref_sha1);
527
528                         **tail = rm;
529                         *tail = &rm->next;
530                 }
531                 free(ref_name);
532         }
533         string_list_clear(&existing_refs, 0);
534         string_list_clear(&new_refs, 0);
535 }
536
537 static void check_not_current_branch(struct ref *ref_map)
538 {
539         struct branch *current_branch = branch_get(NULL);
540
541         if (is_bare_repository() || !current_branch)
542                 return;
543
544         for (; ref_map; ref_map = ref_map->next)
545                 if (ref_map->peer_ref && !strcmp(current_branch->refname,
546                                         ref_map->peer_ref->name))
547                         die("Refusing to fetch into current branch");
548 }
549
550 static int do_fetch(struct transport *transport,
551                     struct refspec *refs, int ref_count)
552 {
553         struct ref *ref_map;
554         struct ref *rm;
555         int autotags = (transport->remote->fetch_tags == 1);
556         if (transport->remote->fetch_tags == 2 && tags != TAGS_UNSET)
557                 tags = TAGS_SET;
558         if (transport->remote->fetch_tags == -1)
559                 tags = TAGS_UNSET;
560
561         if (!transport->get_refs_list || !transport->fetch)
562                 die("Don't know how to fetch from %s", transport->url);
563
564         /* if not appending, truncate FETCH_HEAD */
565         if (!append) {
566                 char *filename = git_path("FETCH_HEAD");
567                 FILE *fp = fopen(filename, "w");
568                 if (!fp)
569                         return error("cannot open %s: %s\n", filename, strerror(errno));
570                 fclose(fp);
571         }
572
573         ref_map = get_ref_map(transport, refs, ref_count, tags, &autotags);
574         if (!update_head_ok)
575                 check_not_current_branch(ref_map);
576
577         for (rm = ref_map; rm; rm = rm->next) {
578                 if (rm->peer_ref)
579                         read_ref(rm->peer_ref->name, rm->peer_ref->old_sha1);
580         }
581
582         if (tags == TAGS_DEFAULT && autotags)
583                 transport_set_option(transport, TRANS_OPT_FOLLOWTAGS, "1");
584         if (fetch_refs(transport, ref_map)) {
585                 free_refs(ref_map);
586                 return 1;
587         }
588         free_refs(ref_map);
589
590         /* if neither --no-tags nor --tags was specified, do automated tag
591          * following ... */
592         if (tags == TAGS_DEFAULT && autotags) {
593                 struct ref **tail = &ref_map;
594                 ref_map = NULL;
595                 find_non_local_tags(transport, &ref_map, &tail);
596                 if (ref_map) {
597                         transport_set_option(transport, TRANS_OPT_FOLLOWTAGS, NULL);
598                         transport_set_option(transport, TRANS_OPT_DEPTH, "0");
599                         fetch_refs(transport, ref_map);
600                 }
601                 free_refs(ref_map);
602         }
603
604         return 0;
605 }
606
607 static void set_option(const char *name, const char *value)
608 {
609         int r = transport_set_option(transport, name, value);
610         if (r < 0)
611                 die("Option \"%s\" value \"%s\" is not valid for %s",
612                         name, value, transport->url);
613         if (r > 0)
614                 warning("Option \"%s\" is ignored for %s\n",
615                         name, transport->url);
616 }
617
618 int cmd_fetch(int argc, const char **argv, const char *prefix)
619 {
620         struct remote *remote;
621         int i;
622         static const char **refs = NULL;
623         int ref_nr = 0;
624         int exit_code;
625
626         /* Record the command line for the reflog */
627         strbuf_addstr(&default_rla, "fetch");
628         for (i = 1; i < argc; i++)
629                 strbuf_addf(&default_rla, " %s", argv[i]);
630
631         argc = parse_options(argc, argv,
632                              builtin_fetch_options, builtin_fetch_usage, 0);
633
634         if (argc == 0)
635                 remote = remote_get(NULL);
636         else
637                 remote = remote_get(argv[0]);
638
639         transport = transport_get(remote, remote->url[0]);
640         if (verbosity >= 2)
641                 transport->verbose = 1;
642         if (verbosity < 0)
643                 transport->verbose = -1;
644         if (upload_pack)
645                 set_option(TRANS_OPT_UPLOADPACK, upload_pack);
646         if (keep)
647                 set_option(TRANS_OPT_KEEP, "yes");
648         if (depth)
649                 set_option(TRANS_OPT_DEPTH, depth);
650
651         if (!transport->url)
652                 die("Where do you want to fetch from today?");
653
654         if (argc > 1) {
655                 int j = 0;
656                 refs = xcalloc(argc + 1, sizeof(const char *));
657                 for (i = 1; i < argc; i++) {
658                         if (!strcmp(argv[i], "tag")) {
659                                 char *ref;
660                                 i++;
661                                 if (i >= argc)
662                                         die("You need to specify a tag name.");
663                                 ref = xmalloc(strlen(argv[i]) * 2 + 22);
664                                 strcpy(ref, "refs/tags/");
665                                 strcat(ref, argv[i]);
666                                 strcat(ref, ":refs/tags/");
667                                 strcat(ref, argv[i]);
668                                 refs[j++] = ref;
669                         } else
670                                 refs[j++] = argv[i];
671                 }
672                 refs[j] = NULL;
673                 ref_nr = j;
674         }
675
676         sigchain_push_common(unlock_pack_on_signal);
677         atexit(unlock_pack);
678         exit_code = do_fetch(transport,
679                         parse_fetch_refspec(ref_nr, refs), ref_nr);
680         transport_disconnect(transport);
681         transport = NULL;
682         return exit_code;
683 }