rebase -i: Document how temporary files are used
[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         "git fetch [options] <group>",
18         "git fetch --multiple [options] [<repository> | <group>]...",
19         "git fetch --all [options]",
20         NULL
21 };
22
23 enum {
24         TAGS_UNSET = 0,
25         TAGS_DEFAULT = 1,
26         TAGS_SET = 2
27 };
28
29 static int all, append, dry_run, force, keep, multiple, prune, update_head_ok, verbosity;
30 static int tags = TAGS_DEFAULT;
31 static const char *depth;
32 static const char *upload_pack;
33 static struct strbuf default_rla = STRBUF_INIT;
34 static struct transport *transport;
35
36 static struct option builtin_fetch_options[] = {
37         OPT__VERBOSITY(&verbosity),
38         OPT_BOOLEAN(0, "all", &all,
39                     "fetch from all remotes"),
40         OPT_BOOLEAN('a', "append", &append,
41                     "append to .git/FETCH_HEAD instead of overwriting"),
42         OPT_STRING(0, "upload-pack", &upload_pack, "PATH",
43                    "path to upload pack on remote end"),
44         OPT_BOOLEAN('f', "force", &force,
45                     "force overwrite of local branch"),
46         OPT_BOOLEAN('m', "multiple", &multiple,
47                     "fetch from multiple remotes"),
48         OPT_SET_INT('t', "tags", &tags,
49                     "fetch all tags and associated objects", TAGS_SET),
50         OPT_SET_INT('n', NULL, &tags,
51                     "do not fetch all tags (--no-tags)", TAGS_UNSET),
52         OPT_BOOLEAN('p', "prune", &prune,
53                     "prune tracking branches no longer on remote"),
54         OPT_BOOLEAN(0, "dry-run", &dry_run,
55                     "dry run"),
56         OPT_BOOLEAN('k', "keep", &keep, "keep downloaded pack"),
57         OPT_BOOLEAN('u', "update-head-ok", &update_head_ok,
58                     "allow updating of HEAD ref"),
59         OPT_STRING(0, "depth", &depth, "DEPTH",
60                    "deepen history of shallow clone"),
61         OPT_END()
62 };
63
64 static void unlock_pack(void)
65 {
66         if (transport)
67                 transport_unlock_pack(transport);
68 }
69
70 static void unlock_pack_on_signal(int signo)
71 {
72         unlock_pack();
73         sigchain_pop(signo);
74         raise(signo);
75 }
76
77 static void add_merge_config(struct ref **head,
78                            const struct ref *remote_refs,
79                            struct branch *branch,
80                            struct ref ***tail)
81 {
82         int i;
83
84         for (i = 0; i < branch->merge_nr; i++) {
85                 struct ref *rm, **old_tail = *tail;
86                 struct refspec refspec;
87
88                 for (rm = *head; rm; rm = rm->next) {
89                         if (branch_merge_matches(branch, i, rm->name)) {
90                                 rm->merge = 1;
91                                 break;
92                         }
93                 }
94                 if (rm)
95                         continue;
96
97                 /*
98                  * Not fetched to a tracking branch?  We need to fetch
99                  * it anyway to allow this branch's "branch.$name.merge"
100                  * to be honored by 'git pull', but we do not have to
101                  * fail if branch.$name.merge is misconfigured to point
102                  * at a nonexisting branch.  If we were indeed called by
103                  * 'git pull', it will notice the misconfiguration because
104                  * there is no entry in the resulting FETCH_HEAD marked
105                  * for merging.
106                  */
107                 refspec.src = branch->merge[i]->src;
108                 refspec.dst = NULL;
109                 refspec.pattern = 0;
110                 refspec.force = 0;
111                 get_fetch_map(remote_refs, &refspec, tail, 1);
112                 for (rm = *old_tail; rm; rm = rm->next)
113                         rm->merge = 1;
114         }
115 }
116
117 static void find_non_local_tags(struct transport *transport,
118                         struct ref **head,
119                         struct ref ***tail);
120
121 static struct ref *get_ref_map(struct transport *transport,
122                                struct refspec *refs, int ref_count, int tags,
123                                int *autotags)
124 {
125         int i;
126         struct ref *rm;
127         struct ref *ref_map = NULL;
128         struct ref **tail = &ref_map;
129
130         const struct ref *remote_refs = transport_get_remote_refs(transport);
131
132         if (ref_count || tags == TAGS_SET) {
133                 for (i = 0; i < ref_count; i++) {
134                         get_fetch_map(remote_refs, &refs[i], &tail, 0);
135                         if (refs[i].dst && refs[i].dst[0])
136                                 *autotags = 1;
137                 }
138                 /* Merge everything on the command line, but not --tags */
139                 for (rm = ref_map; rm; rm = rm->next)
140                         rm->merge = 1;
141                 if (tags == TAGS_SET)
142                         get_fetch_map(remote_refs, tag_refspec, &tail, 0);
143         } else {
144                 /* Use the defaults */
145                 struct remote *remote = transport->remote;
146                 struct branch *branch = branch_get(NULL);
147                 int has_merge = branch_has_merge_config(branch);
148                 if (remote && (remote->fetch_refspec_nr || has_merge)) {
149                         for (i = 0; i < remote->fetch_refspec_nr; i++) {
150                                 get_fetch_map(remote_refs, &remote->fetch[i], &tail, 0);
151                                 if (remote->fetch[i].dst &&
152                                     remote->fetch[i].dst[0])
153                                         *autotags = 1;
154                                 if (!i && !has_merge && ref_map &&
155                                     !remote->fetch[0].pattern)
156                                         ref_map->merge = 1;
157                         }
158                         /*
159                          * if the remote we're fetching from is the same
160                          * as given in branch.<name>.remote, we add the
161                          * ref given in branch.<name>.merge, too.
162                          */
163                         if (has_merge &&
164                             !strcmp(branch->remote_name, remote->name))
165                                 add_merge_config(&ref_map, remote_refs, branch, &tail);
166                 } else {
167                         ref_map = get_remote_ref(remote_refs, "HEAD");
168                         if (!ref_map)
169                                 die("Couldn't find remote ref HEAD");
170                         ref_map->merge = 1;
171                         tail = &ref_map->next;
172                 }
173         }
174         if (tags == TAGS_DEFAULT && *autotags)
175                 find_non_local_tags(transport, &ref_map, &tail);
176         ref_remove_duplicates(ref_map);
177
178         return ref_map;
179 }
180
181 #define STORE_REF_ERROR_OTHER 1
182 #define STORE_REF_ERROR_DF_CONFLICT 2
183
184 static int s_update_ref(const char *action,
185                         struct ref *ref,
186                         int check_old)
187 {
188         char msg[1024];
189         char *rla = getenv("GIT_REFLOG_ACTION");
190         static struct ref_lock *lock;
191
192         if (dry_run)
193                 return 0;
194         if (!rla)
195                 rla = default_rla.buf;
196         snprintf(msg, sizeof(msg), "%s: %s", rla, action);
197         lock = lock_any_ref_for_update(ref->name,
198                                        check_old ? ref->old_sha1 : NULL, 0);
199         if (!lock)
200                 return errno == ENOTDIR ? STORE_REF_ERROR_DF_CONFLICT :
201                                           STORE_REF_ERROR_OTHER;
202         if (write_ref_sha1(lock, ref->new_sha1, msg) < 0)
203                 return errno == ENOTDIR ? STORE_REF_ERROR_DF_CONFLICT :
204                                           STORE_REF_ERROR_OTHER;
205         return 0;
206 }
207
208 #define SUMMARY_WIDTH (2 * DEFAULT_ABBREV + 3)
209 #define REFCOL_WIDTH  10
210
211 static int update_local_ref(struct ref *ref,
212                             const char *remote,
213                             char *display)
214 {
215         struct commit *current = NULL, *updated;
216         enum object_type type;
217         struct branch *current_branch = branch_get(NULL);
218         const char *pretty_ref = prettify_refname(ref->name);
219
220         *display = 0;
221         type = sha1_object_info(ref->new_sha1, NULL);
222         if (type < 0)
223                 die("object %s not found", sha1_to_hex(ref->new_sha1));
224
225         if (!hashcmp(ref->old_sha1, ref->new_sha1)) {
226                 if (verbosity > 0)
227                         sprintf(display, "= %-*s %-*s -> %s", SUMMARY_WIDTH,
228                                 "[up to date]", REFCOL_WIDTH, remote,
229                                 pretty_ref);
230                 return 0;
231         }
232
233         if (current_branch &&
234             !strcmp(ref->name, current_branch->name) &&
235             !(update_head_ok || is_bare_repository()) &&
236             !is_null_sha1(ref->old_sha1)) {
237                 /*
238                  * If this is the head, and it's not okay to update
239                  * the head, and the old value of the head isn't empty...
240                  */
241                 sprintf(display, "! %-*s %-*s -> %s  (can't fetch in current branch)",
242                         SUMMARY_WIDTH, "[rejected]", REFCOL_WIDTH, remote,
243                         pretty_ref);
244                 return 1;
245         }
246
247         if (!is_null_sha1(ref->old_sha1) &&
248             !prefixcmp(ref->name, "refs/tags/")) {
249                 int r;
250                 r = s_update_ref("updating tag", ref, 0);
251                 sprintf(display, "%c %-*s %-*s -> %s%s", r ? '!' : '-',
252                         SUMMARY_WIDTH, "[tag update]", REFCOL_WIDTH, remote,
253                         pretty_ref, r ? "  (unable to update local ref)" : "");
254                 return r;
255         }
256
257         current = lookup_commit_reference_gently(ref->old_sha1, 1);
258         updated = lookup_commit_reference_gently(ref->new_sha1, 1);
259         if (!current || !updated) {
260                 const char *msg;
261                 const char *what;
262                 int r;
263                 if (!strncmp(ref->name, "refs/tags/", 10)) {
264                         msg = "storing tag";
265                         what = "[new tag]";
266                 }
267                 else {
268                         msg = "storing head";
269                         what = "[new branch]";
270                 }
271
272                 r = s_update_ref(msg, ref, 0);
273                 sprintf(display, "%c %-*s %-*s -> %s%s", r ? '!' : '*',
274                         SUMMARY_WIDTH, what, REFCOL_WIDTH, remote, pretty_ref,
275                         r ? "  (unable to update local ref)" : "");
276                 return r;
277         }
278
279         if (in_merge_bases(current, &updated, 1)) {
280                 char quickref[83];
281                 int r;
282                 strcpy(quickref, find_unique_abbrev(current->object.sha1, DEFAULT_ABBREV));
283                 strcat(quickref, "..");
284                 strcat(quickref, find_unique_abbrev(ref->new_sha1, DEFAULT_ABBREV));
285                 r = s_update_ref("fast-forward", ref, 1);
286                 sprintf(display, "%c %-*s %-*s -> %s%s", r ? '!' : ' ',
287                         SUMMARY_WIDTH, quickref, REFCOL_WIDTH, remote,
288                         pretty_ref, r ? "  (unable to update local ref)" : "");
289                 return r;
290         } else if (force || ref->force) {
291                 char quickref[84];
292                 int r;
293                 strcpy(quickref, find_unique_abbrev(current->object.sha1, DEFAULT_ABBREV));
294                 strcat(quickref, "...");
295                 strcat(quickref, find_unique_abbrev(ref->new_sha1, DEFAULT_ABBREV));
296                 r = s_update_ref("forced-update", ref, 1);
297                 sprintf(display, "%c %-*s %-*s -> %s  (%s)", r ? '!' : '+',
298                         SUMMARY_WIDTH, quickref, REFCOL_WIDTH, remote,
299                         pretty_ref,
300                         r ? "unable to update local ref" : "forced update");
301                 return r;
302         } else {
303                 sprintf(display, "! %-*s %-*s -> %s  (non-fast-forward)",
304                         SUMMARY_WIDTH, "[rejected]", REFCOL_WIDTH, remote,
305                         pretty_ref);
306                 return 1;
307         }
308 }
309
310 static int store_updated_refs(const char *raw_url, const char *remote_name,
311                 struct ref *ref_map)
312 {
313         FILE *fp;
314         struct commit *commit;
315         int url_len, i, note_len, shown_url = 0, rc = 0;
316         char note[1024];
317         const char *what, *kind;
318         struct ref *rm;
319         char *url, *filename = dry_run ? "/dev/null" : git_path("FETCH_HEAD");
320
321         fp = fopen(filename, "a");
322         if (!fp)
323                 return error("cannot open %s: %s\n", filename, strerror(errno));
324
325         url = transport_anonymize_url(raw_url);
326         for (rm = ref_map; rm; rm = rm->next) {
327                 struct ref *ref = NULL;
328
329                 if (rm->peer_ref) {
330                         ref = xcalloc(1, sizeof(*ref) + strlen(rm->peer_ref->name) + 1);
331                         strcpy(ref->name, rm->peer_ref->name);
332                         hashcpy(ref->old_sha1, rm->peer_ref->old_sha1);
333                         hashcpy(ref->new_sha1, rm->old_sha1);
334                         ref->force = rm->peer_ref->force;
335                 }
336
337                 commit = lookup_commit_reference_gently(rm->old_sha1, 1);
338                 if (!commit)
339                         rm->merge = 0;
340
341                 if (!strcmp(rm->name, "HEAD")) {
342                         kind = "";
343                         what = "";
344                 }
345                 else if (!prefixcmp(rm->name, "refs/heads/")) {
346                         kind = "branch";
347                         what = rm->name + 11;
348                 }
349                 else if (!prefixcmp(rm->name, "refs/tags/")) {
350                         kind = "tag";
351                         what = rm->name + 10;
352                 }
353                 else if (!prefixcmp(rm->name, "refs/remotes/")) {
354                         kind = "remote branch";
355                         what = rm->name + 13;
356                 }
357                 else {
358                         kind = "";
359                         what = rm->name;
360                 }
361
362                 url_len = strlen(url);
363                 for (i = url_len - 1; url[i] == '/' && 0 <= i; i--)
364                         ;
365                 url_len = i + 1;
366                 if (4 < i && !strncmp(".git", url + i - 3, 4))
367                         url_len = i - 3;
368
369                 note_len = 0;
370                 if (*what) {
371                         if (*kind)
372                                 note_len += sprintf(note + note_len, "%s ",
373                                                     kind);
374                         note_len += sprintf(note + note_len, "'%s' of ", what);
375                 }
376                 note[note_len] = '\0';
377                 fprintf(fp, "%s\t%s\t%s",
378                         sha1_to_hex(commit ? commit->object.sha1 :
379                                     rm->old_sha1),
380                         rm->merge ? "" : "not-for-merge",
381                         note);
382                 for (i = 0; i < url_len; ++i)
383                         if ('\n' == url[i])
384                                 fputs("\\n", fp);
385                         else
386                                 fputc(url[i], fp);
387                 fputc('\n', fp);
388
389                 if (ref)
390                         rc |= update_local_ref(ref, what, note);
391                 else
392                         sprintf(note, "* %-*s %-*s -> FETCH_HEAD",
393                                 SUMMARY_WIDTH, *kind ? kind : "branch",
394                                  REFCOL_WIDTH, *what ? what : "HEAD");
395                 if (*note) {
396                         if (verbosity >= 0 && !shown_url) {
397                                 fprintf(stderr, "From %.*s\n",
398                                                 url_len, url);
399                                 shown_url = 1;
400                         }
401                         if (verbosity >= 0)
402                                 fprintf(stderr, " %s\n", note);
403                 }
404         }
405         free(url);
406         fclose(fp);
407         if (rc & STORE_REF_ERROR_DF_CONFLICT)
408                 error("some local refs could not be updated; try running\n"
409                       " 'git remote prune %s' to remove any old, conflicting "
410                       "branches", remote_name);
411         return rc;
412 }
413
414 /*
415  * We would want to bypass the object transfer altogether if
416  * everything we are going to fetch already exists and is connected
417  * locally.
418  *
419  * The refs we are going to fetch are in ref_map.  If running
420  *
421  *  $ git rev-list --objects --stdin --not --all
422  *
423  * (feeding all the refs in ref_map on its standard input)
424  * does not error out, that means everything reachable from the
425  * refs we are going to fetch exists and is connected to some of
426  * our existing refs.
427  */
428 static int quickfetch(struct ref *ref_map)
429 {
430         struct child_process revlist;
431         struct ref *ref;
432         int err;
433         const char *argv[] = {"rev-list",
434                 "--quiet", "--objects", "--stdin", "--not", "--all", NULL};
435
436         /*
437          * If we are deepening a shallow clone we already have these
438          * objects reachable.  Running rev-list here will return with
439          * a good (0) exit status and we'll bypass the fetch that we
440          * really need to perform.  Claiming failure now will ensure
441          * we perform the network exchange to deepen our history.
442          */
443         if (depth)
444                 return -1;
445
446         if (!ref_map)
447                 return 0;
448
449         memset(&revlist, 0, sizeof(revlist));
450         revlist.argv = argv;
451         revlist.git_cmd = 1;
452         revlist.no_stdout = 1;
453         revlist.no_stderr = 1;
454         revlist.in = -1;
455
456         err = start_command(&revlist);
457         if (err) {
458                 error("could not run rev-list");
459                 return err;
460         }
461
462         /*
463          * If rev-list --stdin encounters an unknown commit, it terminates,
464          * which will cause SIGPIPE in the write loop below.
465          */
466         sigchain_push(SIGPIPE, SIG_IGN);
467
468         for (ref = ref_map; ref; ref = ref->next) {
469                 if (write_in_full(revlist.in, sha1_to_hex(ref->old_sha1), 40) < 0 ||
470                     write_str_in_full(revlist.in, "\n") < 0) {
471                         if (errno != EPIPE && errno != EINVAL)
472                                 error("failed write to rev-list: %s", strerror(errno));
473                         err = -1;
474                         break;
475                 }
476         }
477
478         if (close(revlist.in)) {
479                 error("failed to close rev-list's stdin: %s", strerror(errno));
480                 err = -1;
481         }
482
483         sigchain_pop(SIGPIPE);
484
485         return finish_command(&revlist) || err;
486 }
487
488 static int fetch_refs(struct transport *transport, struct ref *ref_map)
489 {
490         int ret = quickfetch(ref_map);
491         if (ret)
492                 ret = transport_fetch_refs(transport, ref_map);
493         if (!ret)
494                 ret |= store_updated_refs(transport->url,
495                                 transport->remote->name,
496                                 ref_map);
497         transport_unlock_pack(transport);
498         return ret;
499 }
500
501 static int prune_refs(struct transport *transport, struct ref *ref_map)
502 {
503         int result = 0;
504         struct ref *ref, *stale_refs = get_stale_heads(transport->remote, ref_map);
505         const char *dangling_msg = dry_run
506                 ? "   (%s will become dangling)\n"
507                 : "   (%s has become dangling)\n";
508
509         for (ref = stale_refs; ref; ref = ref->next) {
510                 if (!dry_run)
511                         result |= delete_ref(ref->name, NULL, 0);
512                 if (verbosity >= 0) {
513                         fprintf(stderr, " x %-*s %-*s -> %s\n",
514                                 SUMMARY_WIDTH, "[deleted]",
515                                 REFCOL_WIDTH, "(none)", prettify_refname(ref->name));
516                         warn_dangling_symref(stderr, dangling_msg, ref->name);
517                 }
518         }
519         free_refs(stale_refs);
520         return result;
521 }
522
523 static int add_existing(const char *refname, const unsigned char *sha1,
524                         int flag, void *cbdata)
525 {
526         struct string_list *list = (struct string_list *)cbdata;
527         struct string_list_item *item = string_list_insert(refname, list);
528         item->util = (void *)sha1;
529         return 0;
530 }
531
532 static int will_fetch(struct ref **head, const unsigned char *sha1)
533 {
534         struct ref *rm = *head;
535         while (rm) {
536                 if (!hashcmp(rm->old_sha1, sha1))
537                         return 1;
538                 rm = rm->next;
539         }
540         return 0;
541 }
542
543 struct tag_data {
544         struct ref **head;
545         struct ref ***tail;
546 };
547
548 static int add_to_tail(struct string_list_item *item, void *cb_data)
549 {
550         struct tag_data *data = (struct tag_data *)cb_data;
551         struct ref *rm = NULL;
552
553         /* We have already decided to ignore this item */
554         if (!item->util)
555                 return 0;
556
557         rm = alloc_ref(item->string);
558         rm->peer_ref = alloc_ref(item->string);
559         hashcpy(rm->old_sha1, item->util);
560
561         **data->tail = rm;
562         *data->tail = &rm->next;
563
564         return 0;
565 }
566
567 static void find_non_local_tags(struct transport *transport,
568                         struct ref **head,
569                         struct ref ***tail)
570 {
571         struct string_list existing_refs = { NULL, 0, 0, 0 };
572         struct string_list remote_refs = { NULL, 0, 0, 0 };
573         struct tag_data data = {head, tail};
574         const struct ref *ref;
575         struct string_list_item *item = NULL;
576
577         for_each_ref(add_existing, &existing_refs);
578         for (ref = transport_get_remote_refs(transport); ref; ref = ref->next) {
579                 if (prefixcmp(ref->name, "refs/tags"))
580                         continue;
581
582                 /*
583                  * The peeled ref always follows the matching base
584                  * ref, so if we see a peeled ref that we don't want
585                  * to fetch then we can mark the ref entry in the list
586                  * as one to ignore by setting util to NULL.
587                  */
588                 if (!strcmp(ref->name + strlen(ref->name) - 3, "^{}")) {
589                         if (item && !has_sha1_file(ref->old_sha1) &&
590                             !will_fetch(head, ref->old_sha1) &&
591                             !has_sha1_file(item->util) &&
592                             !will_fetch(head, item->util))
593                                 item->util = NULL;
594                         item = NULL;
595                         continue;
596                 }
597
598                 /*
599                  * If item is non-NULL here, then we previously saw a
600                  * ref not followed by a peeled reference, so we need
601                  * to check if it is a lightweight tag that we want to
602                  * fetch.
603                  */
604                 if (item && !has_sha1_file(item->util) &&
605                     !will_fetch(head, item->util))
606                         item->util = NULL;
607
608                 item = NULL;
609
610                 /* skip duplicates and refs that we already have */
611                 if (string_list_has_string(&remote_refs, ref->name) ||
612                     string_list_has_string(&existing_refs, ref->name))
613                         continue;
614
615                 item = string_list_insert(ref->name, &remote_refs);
616                 item->util = (void *)ref->old_sha1;
617         }
618         string_list_clear(&existing_refs, 0);
619
620         /*
621          * We may have a final lightweight tag that needs to be
622          * checked to see if it needs fetching.
623          */
624         if (item && !has_sha1_file(item->util) &&
625             !will_fetch(head, item->util))
626                 item->util = NULL;
627
628         /*
629          * For all the tags in the remote_refs string list, call
630          * add_to_tail to add them to the list of refs to be fetched
631          */
632         for_each_string_list(add_to_tail, &remote_refs, &data);
633
634         string_list_clear(&remote_refs, 0);
635 }
636
637 static void check_not_current_branch(struct ref *ref_map)
638 {
639         struct branch *current_branch = branch_get(NULL);
640
641         if (is_bare_repository() || !current_branch)
642                 return;
643
644         for (; ref_map; ref_map = ref_map->next)
645                 if (ref_map->peer_ref && !strcmp(current_branch->refname,
646                                         ref_map->peer_ref->name))
647                         die("Refusing to fetch into current branch %s "
648                             "of non-bare repository", current_branch->refname);
649 }
650
651 static int do_fetch(struct transport *transport,
652                     struct refspec *refs, int ref_count)
653 {
654         struct string_list existing_refs = { NULL, 0, 0, 0 };
655         struct string_list_item *peer_item = NULL;
656         struct ref *ref_map;
657         struct ref *rm;
658         int autotags = (transport->remote->fetch_tags == 1);
659
660         for_each_ref(add_existing, &existing_refs);
661
662         if (transport->remote->fetch_tags == 2 && tags != TAGS_UNSET)
663                 tags = TAGS_SET;
664         if (transport->remote->fetch_tags == -1)
665                 tags = TAGS_UNSET;
666
667         if (!transport->get_refs_list || !transport->fetch)
668                 die("Don't know how to fetch from %s", transport->url);
669
670         /* if not appending, truncate FETCH_HEAD */
671         if (!append && !dry_run) {
672                 char *filename = git_path("FETCH_HEAD");
673                 FILE *fp = fopen(filename, "w");
674                 if (!fp)
675                         return error("cannot open %s: %s\n", filename, strerror(errno));
676                 fclose(fp);
677         }
678
679         ref_map = get_ref_map(transport, refs, ref_count, tags, &autotags);
680         if (!update_head_ok)
681                 check_not_current_branch(ref_map);
682
683         for (rm = ref_map; rm; rm = rm->next) {
684                 if (rm->peer_ref) {
685                         peer_item = string_list_lookup(rm->peer_ref->name,
686                                                        &existing_refs);
687                         if (peer_item)
688                                 hashcpy(rm->peer_ref->old_sha1,
689                                         peer_item->util);
690                 }
691         }
692
693         if (tags == TAGS_DEFAULT && autotags)
694                 transport_set_option(transport, TRANS_OPT_FOLLOWTAGS, "1");
695         if (fetch_refs(transport, ref_map)) {
696                 free_refs(ref_map);
697                 return 1;
698         }
699         if (prune)
700                 prune_refs(transport, ref_map);
701         free_refs(ref_map);
702
703         /* if neither --no-tags nor --tags was specified, do automated tag
704          * following ... */
705         if (tags == TAGS_DEFAULT && autotags) {
706                 struct ref **tail = &ref_map;
707                 ref_map = NULL;
708                 find_non_local_tags(transport, &ref_map, &tail);
709                 if (ref_map) {
710                         transport_set_option(transport, TRANS_OPT_FOLLOWTAGS, NULL);
711                         transport_set_option(transport, TRANS_OPT_DEPTH, "0");
712                         fetch_refs(transport, ref_map);
713                 }
714                 free_refs(ref_map);
715         }
716
717         return 0;
718 }
719
720 static void set_option(const char *name, const char *value)
721 {
722         int r = transport_set_option(transport, name, value);
723         if (r < 0)
724                 die("Option \"%s\" value \"%s\" is not valid for %s",
725                         name, value, transport->url);
726         if (r > 0)
727                 warning("Option \"%s\" is ignored for %s\n",
728                         name, transport->url);
729 }
730
731 static int get_one_remote_for_fetch(struct remote *remote, void *priv)
732 {
733         struct string_list *list = priv;
734         if (!remote->skip_default_update)
735                 string_list_append(remote->name, list);
736         return 0;
737 }
738
739 struct remote_group_data {
740         const char *name;
741         struct string_list *list;
742 };
743
744 static int get_remote_group(const char *key, const char *value, void *priv)
745 {
746         struct remote_group_data *g = priv;
747
748         if (!prefixcmp(key, "remotes.") &&
749                         !strcmp(key + 8, g->name)) {
750                 /* split list by white space */
751                 int space = strcspn(value, " \t\n");
752                 while (*value) {
753                         if (space > 1) {
754                                 string_list_append(xstrndup(value, space),
755                                                    g->list);
756                         }
757                         value += space + (value[space] != '\0');
758                         space = strcspn(value, " \t\n");
759                 }
760         }
761
762         return 0;
763 }
764
765 static int add_remote_or_group(const char *name, struct string_list *list)
766 {
767         int prev_nr = list->nr;
768         struct remote_group_data g = { name, list };
769
770         git_config(get_remote_group, &g);
771         if (list->nr == prev_nr) {
772                 struct remote *remote;
773                 if (!remote_is_configured(name))
774                         return 0;
775                 remote = remote_get(name);
776                 string_list_append(remote->name, list);
777         }
778         return 1;
779 }
780
781 static int fetch_multiple(struct string_list *list)
782 {
783         int i, result = 0;
784         const char *argv[] = { "fetch", NULL, NULL, NULL, NULL, NULL, NULL };
785         int argc = 1;
786
787         if (dry_run)
788                 argv[argc++] = "--dry-run";
789         if (prune)
790                 argv[argc++] = "--prune";
791         if (verbosity >= 2)
792                 argv[argc++] = "-v";
793         if (verbosity >= 1)
794                 argv[argc++] = "-v";
795         else if (verbosity < 0)
796                 argv[argc++] = "-q";
797
798         for (i = 0; i < list->nr; i++) {
799                 const char *name = list->items[i].string;
800                 argv[argc] = name;
801                 if (verbosity >= 0)
802                         printf("Fetching %s\n", name);
803                 if (run_command_v_opt(argv, RUN_GIT_CMD)) {
804                         error("Could not fetch %s", name);
805                         result = 1;
806                 }
807         }
808
809         return result;
810 }
811
812 static int fetch_one(struct remote *remote, int argc, const char **argv)
813 {
814         int i;
815         static const char **refs = NULL;
816         int ref_nr = 0;
817         int exit_code;
818
819         if (!remote)
820                 die("Where do you want to fetch from today?");
821
822         transport = transport_get(remote, remote->url[0]);
823         if (verbosity >= 2)
824                 transport->verbose = verbosity <= 3 ? verbosity : 3;
825         if (verbosity < 0)
826                 transport->verbose = -1;
827         if (upload_pack)
828                 set_option(TRANS_OPT_UPLOADPACK, upload_pack);
829         if (keep)
830                 set_option(TRANS_OPT_KEEP, "yes");
831         if (depth)
832                 set_option(TRANS_OPT_DEPTH, depth);
833
834         if (argc > 0) {
835                 int j = 0;
836                 refs = xcalloc(argc + 1, sizeof(const char *));
837                 for (i = 0; i < argc; i++) {
838                         if (!strcmp(argv[i], "tag")) {
839                                 char *ref;
840                                 i++;
841                                 if (i >= argc)
842                                         die("You need to specify a tag name.");
843                                 ref = xmalloc(strlen(argv[i]) * 2 + 22);
844                                 strcpy(ref, "refs/tags/");
845                                 strcat(ref, argv[i]);
846                                 strcat(ref, ":refs/tags/");
847                                 strcat(ref, argv[i]);
848                                 refs[j++] = ref;
849                         } else
850                                 refs[j++] = argv[i];
851                 }
852                 refs[j] = NULL;
853                 ref_nr = j;
854         }
855
856         sigchain_push_common(unlock_pack_on_signal);
857         atexit(unlock_pack);
858         exit_code = do_fetch(transport,
859                         parse_fetch_refspec(ref_nr, refs), ref_nr);
860         transport_disconnect(transport);
861         transport = NULL;
862         return exit_code;
863 }
864
865 int cmd_fetch(int argc, const char **argv, const char *prefix)
866 {
867         int i;
868         struct string_list list = { NULL, 0, 0, 0 };
869         struct remote *remote;
870         int result = 0;
871
872         /* Record the command line for the reflog */
873         strbuf_addstr(&default_rla, "fetch");
874         for (i = 1; i < argc; i++)
875                 strbuf_addf(&default_rla, " %s", argv[i]);
876
877         argc = parse_options(argc, argv, prefix,
878                              builtin_fetch_options, builtin_fetch_usage, 0);
879
880         if (all) {
881                 if (argc == 1)
882                         die("fetch --all does not take a repository argument");
883                 else if (argc > 1)
884                         die("fetch --all does not make sense with refspecs");
885                 (void) for_each_remote(get_one_remote_for_fetch, &list);
886                 result = fetch_multiple(&list);
887         } else if (argc == 0) {
888                 /* No arguments -- use default remote */
889                 remote = remote_get(NULL);
890                 result = fetch_one(remote, argc, argv);
891         } else if (multiple) {
892                 /* All arguments are assumed to be remotes or groups */
893                 for (i = 0; i < argc; i++)
894                         if (!add_remote_or_group(argv[i], &list))
895                                 die("No such remote or remote group: %s", argv[i]);
896                 result = fetch_multiple(&list);
897         } else {
898                 /* Single remote or group */
899                 (void) add_remote_or_group(argv[0], &list);
900                 if (list.nr > 1) {
901                         /* More than one remote */
902                         if (argc > 1)
903                                 die("Fetching a group and specifying refspecs does not make sense");
904                         result = fetch_multiple(&list);
905                 } else {
906                         /* Zero or one remotes */
907                         remote = remote_get(argv[0]);
908                         result = fetch_one(remote, argc-1, argv+1);
909                 }
910         }
911
912         /* All names were strdup()ed or strndup()ed */
913         list.strdup_strings = 1;
914         string_list_clear(&list, 0);
915
916         return result;
917 }