Merge git-gui 0.14.0
[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 #include "transport.h"
15 #include "submodule.h"
16
17 static const char * const builtin_fetch_usage[] = {
18         "git fetch [<options>] [<repository> [<refspec>...]]",
19         "git fetch [<options>] <group>",
20         "git fetch --multiple [<options>] [(<repository> | <group>)...]",
21         "git fetch --all [<options>]",
22         NULL
23 };
24
25 enum {
26         TAGS_UNSET = 0,
27         TAGS_DEFAULT = 1,
28         TAGS_SET = 2
29 };
30
31 enum {
32         RECURSE_SUBMODULES_OFF = 0,
33         RECURSE_SUBMODULES_DEFAULT = 1,
34         RECURSE_SUBMODULES_ON = 2
35 };
36
37 static int all, append, dry_run, force, keep, multiple, prune, update_head_ok, verbosity;
38 static int progress, recurse_submodules = RECURSE_SUBMODULES_DEFAULT;
39 static int tags = TAGS_DEFAULT;
40 static const char *depth;
41 static const char *upload_pack;
42 static struct strbuf default_rla = STRBUF_INIT;
43 static struct transport *transport;
44 static const char *submodule_prefix = "";
45
46 static struct option builtin_fetch_options[] = {
47         OPT__VERBOSITY(&verbosity),
48         OPT_BOOLEAN(0, "all", &all,
49                     "fetch from all remotes"),
50         OPT_BOOLEAN('a', "append", &append,
51                     "append to .git/FETCH_HEAD instead of overwriting"),
52         OPT_STRING(0, "upload-pack", &upload_pack, "path",
53                    "path to upload pack on remote end"),
54         OPT__FORCE(&force, "force overwrite of local branch"),
55         OPT_BOOLEAN('m', "multiple", &multiple,
56                     "fetch from multiple remotes"),
57         OPT_SET_INT('t', "tags", &tags,
58                     "fetch all tags and associated objects", TAGS_SET),
59         OPT_SET_INT('n', NULL, &tags,
60                     "do not fetch all tags (--no-tags)", TAGS_UNSET),
61         OPT_BOOLEAN('p', "prune", &prune,
62                     "prune remote-tracking branches no longer on remote"),
63         OPT_SET_INT(0, "recurse-submodules", &recurse_submodules,
64                     "control recursive fetching of submodules",
65                     RECURSE_SUBMODULES_ON),
66         OPT_BOOLEAN(0, "dry-run", &dry_run,
67                     "dry run"),
68         OPT_BOOLEAN('k', "keep", &keep, "keep downloaded pack"),
69         OPT_BOOLEAN('u', "update-head-ok", &update_head_ok,
70                     "allow updating of HEAD ref"),
71         OPT_BOOLEAN(0, "progress", &progress, "force progress reporting"),
72         OPT_STRING(0, "depth", &depth, "depth",
73                    "deepen history of shallow clone"),
74         { OPTION_STRING, 0, "submodule-prefix", &submodule_prefix, "dir",
75                    "prepend this to submodule path output", PARSE_OPT_HIDDEN },
76         OPT_END()
77 };
78
79 static void unlock_pack(void)
80 {
81         if (transport)
82                 transport_unlock_pack(transport);
83 }
84
85 static void unlock_pack_on_signal(int signo)
86 {
87         unlock_pack();
88         sigchain_pop(signo);
89         raise(signo);
90 }
91
92 static void add_merge_config(struct ref **head,
93                            const struct ref *remote_refs,
94                            struct branch *branch,
95                            struct ref ***tail)
96 {
97         int i;
98
99         for (i = 0; i < branch->merge_nr; i++) {
100                 struct ref *rm, **old_tail = *tail;
101                 struct refspec refspec;
102
103                 for (rm = *head; rm; rm = rm->next) {
104                         if (branch_merge_matches(branch, i, rm->name)) {
105                                 rm->merge = 1;
106                                 break;
107                         }
108                 }
109                 if (rm)
110                         continue;
111
112                 /*
113                  * Not fetched to a remote-tracking branch?  We need to fetch
114                  * it anyway to allow this branch's "branch.$name.merge"
115                  * to be honored by 'git pull', but we do not have to
116                  * fail if branch.$name.merge is misconfigured to point
117                  * at a nonexisting branch.  If we were indeed called by
118                  * 'git pull', it will notice the misconfiguration because
119                  * there is no entry in the resulting FETCH_HEAD marked
120                  * for merging.
121                  */
122                 memset(&refspec, 0, sizeof(refspec));
123                 refspec.src = branch->merge[i]->src;
124                 get_fetch_map(remote_refs, &refspec, tail, 1);
125                 for (rm = *old_tail; rm; rm = rm->next)
126                         rm->merge = 1;
127         }
128 }
129
130 static void find_non_local_tags(struct transport *transport,
131                         struct ref **head,
132                         struct ref ***tail);
133
134 static struct ref *get_ref_map(struct transport *transport,
135                                struct refspec *refs, int ref_count, int tags,
136                                int *autotags)
137 {
138         int i;
139         struct ref *rm;
140         struct ref *ref_map = NULL;
141         struct ref **tail = &ref_map;
142
143         const struct ref *remote_refs = transport_get_remote_refs(transport);
144
145         if (ref_count || tags == TAGS_SET) {
146                 for (i = 0; i < ref_count; i++) {
147                         get_fetch_map(remote_refs, &refs[i], &tail, 0);
148                         if (refs[i].dst && refs[i].dst[0])
149                                 *autotags = 1;
150                 }
151                 /* Merge everything on the command line, but not --tags */
152                 for (rm = ref_map; rm; rm = rm->next)
153                         rm->merge = 1;
154                 if (tags == TAGS_SET)
155                         get_fetch_map(remote_refs, tag_refspec, &tail, 0);
156         } else {
157                 /* Use the defaults */
158                 struct remote *remote = transport->remote;
159                 struct branch *branch = branch_get(NULL);
160                 int has_merge = branch_has_merge_config(branch);
161                 if (remote &&
162                     (remote->fetch_refspec_nr ||
163                      /* Note: has_merge implies non-NULL branch->remote_name */
164                      (has_merge && !strcmp(branch->remote_name, remote->name)))) {
165                         for (i = 0; i < remote->fetch_refspec_nr; i++) {
166                                 get_fetch_map(remote_refs, &remote->fetch[i], &tail, 0);
167                                 if (remote->fetch[i].dst &&
168                                     remote->fetch[i].dst[0])
169                                         *autotags = 1;
170                                 if (!i && !has_merge && ref_map &&
171                                     !remote->fetch[0].pattern)
172                                         ref_map->merge = 1;
173                         }
174                         /*
175                          * if the remote we're fetching from is the same
176                          * as given in branch.<name>.remote, we add the
177                          * ref given in branch.<name>.merge, too.
178                          *
179                          * Note: has_merge implies non-NULL branch->remote_name
180                          */
181                         if (has_merge &&
182                             !strcmp(branch->remote_name, remote->name))
183                                 add_merge_config(&ref_map, remote_refs, branch, &tail);
184                 } else {
185                         ref_map = get_remote_ref(remote_refs, "HEAD");
186                         if (!ref_map)
187                                 die("Couldn't find remote ref HEAD");
188                         ref_map->merge = 1;
189                         tail = &ref_map->next;
190                 }
191         }
192         if (tags == TAGS_DEFAULT && *autotags)
193                 find_non_local_tags(transport, &ref_map, &tail);
194         ref_remove_duplicates(ref_map);
195
196         return ref_map;
197 }
198
199 #define STORE_REF_ERROR_OTHER 1
200 #define STORE_REF_ERROR_DF_CONFLICT 2
201
202 static int s_update_ref(const char *action,
203                         struct ref *ref,
204                         int check_old)
205 {
206         char msg[1024];
207         char *rla = getenv("GIT_REFLOG_ACTION");
208         static struct ref_lock *lock;
209
210         if (dry_run)
211                 return 0;
212         if (!rla)
213                 rla = default_rla.buf;
214         snprintf(msg, sizeof(msg), "%s: %s", rla, action);
215         lock = lock_any_ref_for_update(ref->name,
216                                        check_old ? ref->old_sha1 : NULL, 0);
217         if (!lock)
218                 return errno == ENOTDIR ? STORE_REF_ERROR_DF_CONFLICT :
219                                           STORE_REF_ERROR_OTHER;
220         if (write_ref_sha1(lock, ref->new_sha1, msg) < 0)
221                 return errno == ENOTDIR ? STORE_REF_ERROR_DF_CONFLICT :
222                                           STORE_REF_ERROR_OTHER;
223         return 0;
224 }
225
226 #define REFCOL_WIDTH  10
227
228 static int update_local_ref(struct ref *ref,
229                             const char *remote,
230                             char *display)
231 {
232         struct commit *current = NULL, *updated;
233         enum object_type type;
234         struct branch *current_branch = branch_get(NULL);
235         const char *pretty_ref = prettify_refname(ref->name);
236
237         *display = 0;
238         type = sha1_object_info(ref->new_sha1, NULL);
239         if (type < 0)
240                 die("object %s not found", sha1_to_hex(ref->new_sha1));
241
242         if (!hashcmp(ref->old_sha1, ref->new_sha1)) {
243                 if (verbosity > 0)
244                         sprintf(display, "= %-*s %-*s -> %s", TRANSPORT_SUMMARY_WIDTH,
245                                 "[up to date]", REFCOL_WIDTH, remote,
246                                 pretty_ref);
247                 return 0;
248         }
249
250         if (current_branch &&
251             !strcmp(ref->name, current_branch->name) &&
252             !(update_head_ok || is_bare_repository()) &&
253             !is_null_sha1(ref->old_sha1)) {
254                 /*
255                  * If this is the head, and it's not okay to update
256                  * the head, and the old value of the head isn't empty...
257                  */
258                 sprintf(display, "! %-*s %-*s -> %s  (can't fetch in current branch)",
259                         TRANSPORT_SUMMARY_WIDTH, "[rejected]", REFCOL_WIDTH, remote,
260                         pretty_ref);
261                 return 1;
262         }
263
264         if (!is_null_sha1(ref->old_sha1) &&
265             !prefixcmp(ref->name, "refs/tags/")) {
266                 int r;
267                 r = s_update_ref("updating tag", ref, 0);
268                 sprintf(display, "%c %-*s %-*s -> %s%s", r ? '!' : '-',
269                         TRANSPORT_SUMMARY_WIDTH, "[tag update]", REFCOL_WIDTH, remote,
270                         pretty_ref, r ? "  (unable to update local ref)" : "");
271                 return r;
272         }
273
274         current = lookup_commit_reference_gently(ref->old_sha1, 1);
275         updated = lookup_commit_reference_gently(ref->new_sha1, 1);
276         if (!current || !updated) {
277                 const char *msg;
278                 const char *what;
279                 int r;
280                 if (!strncmp(ref->name, "refs/tags/", 10)) {
281                         msg = "storing tag";
282                         what = "[new tag]";
283                 }
284                 else {
285                         msg = "storing head";
286                         what = "[new branch]";
287                 }
288
289                 r = s_update_ref(msg, ref, 0);
290                 sprintf(display, "%c %-*s %-*s -> %s%s", r ? '!' : '*',
291                         TRANSPORT_SUMMARY_WIDTH, what, REFCOL_WIDTH, remote, pretty_ref,
292                         r ? "  (unable to update local ref)" : "");
293                 return r;
294         }
295
296         if (in_merge_bases(current, &updated, 1)) {
297                 char quickref[83];
298                 int r;
299                 strcpy(quickref, find_unique_abbrev(current->object.sha1, DEFAULT_ABBREV));
300                 strcat(quickref, "..");
301                 strcat(quickref, find_unique_abbrev(ref->new_sha1, DEFAULT_ABBREV));
302                 r = s_update_ref("fast-forward", ref, 1);
303                 sprintf(display, "%c %-*s %-*s -> %s%s", r ? '!' : ' ',
304                         TRANSPORT_SUMMARY_WIDTH, quickref, REFCOL_WIDTH, remote,
305                         pretty_ref, r ? "  (unable to update local ref)" : "");
306                 return r;
307         } else if (force || ref->force) {
308                 char quickref[84];
309                 int r;
310                 strcpy(quickref, find_unique_abbrev(current->object.sha1, DEFAULT_ABBREV));
311                 strcat(quickref, "...");
312                 strcat(quickref, find_unique_abbrev(ref->new_sha1, DEFAULT_ABBREV));
313                 r = s_update_ref("forced-update", ref, 1);
314                 sprintf(display, "%c %-*s %-*s -> %s  (%s)", r ? '!' : '+',
315                         TRANSPORT_SUMMARY_WIDTH, quickref, REFCOL_WIDTH, remote,
316                         pretty_ref,
317                         r ? "unable to update local ref" : "forced update");
318                 return r;
319         } else {
320                 sprintf(display, "! %-*s %-*s -> %s  (non-fast-forward)",
321                         TRANSPORT_SUMMARY_WIDTH, "[rejected]", REFCOL_WIDTH, remote,
322                         pretty_ref);
323                 return 1;
324         }
325 }
326
327 static int store_updated_refs(const char *raw_url, const char *remote_name,
328                 struct ref *ref_map)
329 {
330         FILE *fp;
331         struct commit *commit;
332         int url_len, i, note_len, shown_url = 0, rc = 0;
333         char note[1024];
334         const char *what, *kind;
335         struct ref *rm;
336         char *url, *filename = dry_run ? "/dev/null" : git_path("FETCH_HEAD");
337
338         fp = fopen(filename, "a");
339         if (!fp)
340                 return error("cannot open %s: %s\n", filename, strerror(errno));
341
342         if (raw_url)
343                 url = transport_anonymize_url(raw_url);
344         else
345                 url = xstrdup("foreign");
346         for (rm = ref_map; rm; rm = rm->next) {
347                 struct ref *ref = NULL;
348
349                 if (rm->peer_ref) {
350                         ref = xcalloc(1, sizeof(*ref) + strlen(rm->peer_ref->name) + 1);
351                         strcpy(ref->name, rm->peer_ref->name);
352                         hashcpy(ref->old_sha1, rm->peer_ref->old_sha1);
353                         hashcpy(ref->new_sha1, rm->old_sha1);
354                         ref->force = rm->peer_ref->force;
355                 }
356
357                 commit = lookup_commit_reference_gently(rm->old_sha1, 1);
358                 if (!commit)
359                         rm->merge = 0;
360
361                 if (!strcmp(rm->name, "HEAD")) {
362                         kind = "";
363                         what = "";
364                 }
365                 else if (!prefixcmp(rm->name, "refs/heads/")) {
366                         kind = "branch";
367                         what = rm->name + 11;
368                 }
369                 else if (!prefixcmp(rm->name, "refs/tags/")) {
370                         kind = "tag";
371                         what = rm->name + 10;
372                 }
373                 else if (!prefixcmp(rm->name, "refs/remotes/")) {
374                         kind = "remote-tracking branch";
375                         what = rm->name + 13;
376                 }
377                 else {
378                         kind = "";
379                         what = rm->name;
380                 }
381
382                 url_len = strlen(url);
383                 for (i = url_len - 1; url[i] == '/' && 0 <= i; i--)
384                         ;
385                 url_len = i + 1;
386                 if (4 < i && !strncmp(".git", url + i - 3, 4))
387                         url_len = i - 3;
388
389                 note_len = 0;
390                 if (*what) {
391                         if (*kind)
392                                 note_len += sprintf(note + note_len, "%s ",
393                                                     kind);
394                         note_len += sprintf(note + note_len, "'%s' of ", what);
395                 }
396                 note[note_len] = '\0';
397                 fprintf(fp, "%s\t%s\t%s",
398                         sha1_to_hex(commit ? commit->object.sha1 :
399                                     rm->old_sha1),
400                         rm->merge ? "" : "not-for-merge",
401                         note);
402                 for (i = 0; i < url_len; ++i)
403                         if ('\n' == url[i])
404                                 fputs("\\n", fp);
405                         else
406                                 fputc(url[i], fp);
407                 fputc('\n', fp);
408
409                 if (ref) {
410                         rc |= update_local_ref(ref, what, note);
411                         free(ref);
412                 } else
413                         sprintf(note, "* %-*s %-*s -> FETCH_HEAD",
414                                 TRANSPORT_SUMMARY_WIDTH, *kind ? kind : "branch",
415                                  REFCOL_WIDTH, *what ? what : "HEAD");
416                 if (*note) {
417                         if (verbosity >= 0 && !shown_url) {
418                                 fprintf(stderr, "From %.*s\n",
419                                                 url_len, url);
420                                 shown_url = 1;
421                         }
422                         if (verbosity >= 0)
423                                 fprintf(stderr, " %s\n", note);
424                 }
425         }
426         free(url);
427         fclose(fp);
428         if (rc & STORE_REF_ERROR_DF_CONFLICT)
429                 error("some local refs could not be updated; try running\n"
430                       " 'git remote prune %s' to remove any old, conflicting "
431                       "branches", remote_name);
432         return rc;
433 }
434
435 /*
436  * We would want to bypass the object transfer altogether if
437  * everything we are going to fetch already exists and is connected
438  * locally.
439  *
440  * The refs we are going to fetch are in ref_map.  If running
441  *
442  *  $ git rev-list --objects --stdin --not --all
443  *
444  * (feeding all the refs in ref_map on its standard input)
445  * does not error out, that means everything reachable from the
446  * refs we are going to fetch exists and is connected to some of
447  * our existing refs.
448  */
449 static int quickfetch(struct ref *ref_map)
450 {
451         struct child_process revlist;
452         struct ref *ref;
453         int err;
454         const char *argv[] = {"rev-list",
455                 "--quiet", "--objects", "--stdin", "--not", "--all", NULL};
456
457         /*
458          * If we are deepening a shallow clone we already have these
459          * objects reachable.  Running rev-list here will return with
460          * a good (0) exit status and we'll bypass the fetch that we
461          * really need to perform.  Claiming failure now will ensure
462          * we perform the network exchange to deepen our history.
463          */
464         if (depth)
465                 return -1;
466
467         if (!ref_map)
468                 return 0;
469
470         memset(&revlist, 0, sizeof(revlist));
471         revlist.argv = argv;
472         revlist.git_cmd = 1;
473         revlist.no_stdout = 1;
474         revlist.no_stderr = 1;
475         revlist.in = -1;
476
477         err = start_command(&revlist);
478         if (err) {
479                 error("could not run rev-list");
480                 return err;
481         }
482
483         /*
484          * If rev-list --stdin encounters an unknown commit, it terminates,
485          * which will cause SIGPIPE in the write loop below.
486          */
487         sigchain_push(SIGPIPE, SIG_IGN);
488
489         for (ref = ref_map; ref; ref = ref->next) {
490                 if (write_in_full(revlist.in, sha1_to_hex(ref->old_sha1), 40) < 0 ||
491                     write_str_in_full(revlist.in, "\n") < 0) {
492                         if (errno != EPIPE && errno != EINVAL)
493                                 error("failed write to rev-list: %s", strerror(errno));
494                         err = -1;
495                         break;
496                 }
497         }
498
499         if (close(revlist.in)) {
500                 error("failed to close rev-list's stdin: %s", strerror(errno));
501                 err = -1;
502         }
503
504         sigchain_pop(SIGPIPE);
505
506         return finish_command(&revlist) || err;
507 }
508
509 static int fetch_refs(struct transport *transport, struct ref *ref_map)
510 {
511         int ret = quickfetch(ref_map);
512         if (ret)
513                 ret = transport_fetch_refs(transport, ref_map);
514         if (!ret)
515                 ret |= store_updated_refs(transport->url,
516                                 transport->remote->name,
517                                 ref_map);
518         transport_unlock_pack(transport);
519         return ret;
520 }
521
522 static int prune_refs(struct transport *transport, struct ref *ref_map)
523 {
524         int result = 0;
525         struct ref *ref, *stale_refs = get_stale_heads(transport->remote, ref_map);
526         const char *dangling_msg = dry_run
527                 ? "   (%s will become dangling)\n"
528                 : "   (%s has become dangling)\n";
529
530         for (ref = stale_refs; ref; ref = ref->next) {
531                 if (!dry_run)
532                         result |= delete_ref(ref->name, NULL, 0);
533                 if (verbosity >= 0) {
534                         fprintf(stderr, " x %-*s %-*s -> %s\n",
535                                 TRANSPORT_SUMMARY_WIDTH, "[deleted]",
536                                 REFCOL_WIDTH, "(none)", prettify_refname(ref->name));
537                         warn_dangling_symref(stderr, dangling_msg, ref->name);
538                 }
539         }
540         free_refs(stale_refs);
541         return result;
542 }
543
544 static int add_existing(const char *refname, const unsigned char *sha1,
545                         int flag, void *cbdata)
546 {
547         struct string_list *list = (struct string_list *)cbdata;
548         struct string_list_item *item = string_list_insert(list, refname);
549         item->util = (void *)sha1;
550         return 0;
551 }
552
553 static int will_fetch(struct ref **head, const unsigned char *sha1)
554 {
555         struct ref *rm = *head;
556         while (rm) {
557                 if (!hashcmp(rm->old_sha1, sha1))
558                         return 1;
559                 rm = rm->next;
560         }
561         return 0;
562 }
563
564 static void find_non_local_tags(struct transport *transport,
565                         struct ref **head,
566                         struct ref ***tail)
567 {
568         struct string_list existing_refs = STRING_LIST_INIT_NODUP;
569         struct string_list remote_refs = STRING_LIST_INIT_NODUP;
570         const struct ref *ref;
571         struct string_list_item *item = NULL;
572
573         for_each_ref(add_existing, &existing_refs);
574         for (ref = transport_get_remote_refs(transport); ref; ref = ref->next) {
575                 if (prefixcmp(ref->name, "refs/tags"))
576                         continue;
577
578                 /*
579                  * The peeled ref always follows the matching base
580                  * ref, so if we see a peeled ref that we don't want
581                  * to fetch then we can mark the ref entry in the list
582                  * as one to ignore by setting util to NULL.
583                  */
584                 if (!suffixcmp(ref->name, "^{}")) {
585                         if (item && !has_sha1_file(ref->old_sha1) &&
586                             !will_fetch(head, ref->old_sha1) &&
587                             !has_sha1_file(item->util) &&
588                             !will_fetch(head, item->util))
589                                 item->util = NULL;
590                         item = NULL;
591                         continue;
592                 }
593
594                 /*
595                  * If item is non-NULL here, then we previously saw a
596                  * ref not followed by a peeled reference, so we need
597                  * to check if it is a lightweight tag that we want to
598                  * fetch.
599                  */
600                 if (item && !has_sha1_file(item->util) &&
601                     !will_fetch(head, item->util))
602                         item->util = NULL;
603
604                 item = NULL;
605
606                 /* skip duplicates and refs that we already have */
607                 if (string_list_has_string(&remote_refs, ref->name) ||
608                     string_list_has_string(&existing_refs, ref->name))
609                         continue;
610
611                 item = string_list_insert(&remote_refs, ref->name);
612                 item->util = (void *)ref->old_sha1;
613         }
614         string_list_clear(&existing_refs, 0);
615
616         /*
617          * We may have a final lightweight tag that needs to be
618          * checked to see if it needs fetching.
619          */
620         if (item && !has_sha1_file(item->util) &&
621             !will_fetch(head, item->util))
622                 item->util = NULL;
623
624         /*
625          * For all the tags in the remote_refs string list,
626          * add them to the list of refs to be fetched
627          */
628         for_each_string_list_item(item, &remote_refs) {
629                 /* Unless we have already decided to ignore this item... */
630                 if (item->util)
631                 {
632                         struct ref *rm = alloc_ref(item->string);
633                         rm->peer_ref = alloc_ref(item->string);
634                         hashcpy(rm->old_sha1, item->util);
635                         **tail = rm;
636                         *tail = &rm->next;
637                 }
638         }
639
640         string_list_clear(&remote_refs, 0);
641 }
642
643 static void check_not_current_branch(struct ref *ref_map)
644 {
645         struct branch *current_branch = branch_get(NULL);
646
647         if (is_bare_repository() || !current_branch)
648                 return;
649
650         for (; ref_map; ref_map = ref_map->next)
651                 if (ref_map->peer_ref && !strcmp(current_branch->refname,
652                                         ref_map->peer_ref->name))
653                         die("Refusing to fetch into current branch %s "
654                             "of non-bare repository", current_branch->refname);
655 }
656
657 static int truncate_fetch_head(void)
658 {
659         char *filename = git_path("FETCH_HEAD");
660         FILE *fp = fopen(filename, "w");
661
662         if (!fp)
663                 return error("cannot open %s: %s\n", filename, strerror(errno));
664         fclose(fp);
665         return 0;
666 }
667
668 static int do_fetch(struct transport *transport,
669                     struct refspec *refs, int ref_count)
670 {
671         struct string_list existing_refs = STRING_LIST_INIT_NODUP;
672         struct string_list_item *peer_item = NULL;
673         struct ref *ref_map;
674         struct ref *rm;
675         int autotags = (transport->remote->fetch_tags == 1);
676
677         for_each_ref(add_existing, &existing_refs);
678
679         if (tags == TAGS_DEFAULT) {
680                 if (transport->remote->fetch_tags == 2)
681                         tags = TAGS_SET;
682                 if (transport->remote->fetch_tags == -1)
683                         tags = TAGS_UNSET;
684         }
685
686         if (!transport->get_refs_list || !transport->fetch)
687                 die("Don't know how to fetch from %s", transport->url);
688
689         /* if not appending, truncate FETCH_HEAD */
690         if (!append && !dry_run) {
691                 int errcode = truncate_fetch_head();
692                 if (errcode)
693                         return errcode;
694         }
695
696         ref_map = get_ref_map(transport, refs, ref_count, tags, &autotags);
697         if (!update_head_ok)
698                 check_not_current_branch(ref_map);
699
700         for (rm = ref_map; rm; rm = rm->next) {
701                 if (rm->peer_ref) {
702                         peer_item = string_list_lookup(&existing_refs,
703                                                        rm->peer_ref->name);
704                         if (peer_item)
705                                 hashcpy(rm->peer_ref->old_sha1,
706                                         peer_item->util);
707                 }
708         }
709
710         if (tags == TAGS_DEFAULT && autotags)
711                 transport_set_option(transport, TRANS_OPT_FOLLOWTAGS, "1");
712         if (fetch_refs(transport, ref_map)) {
713                 free_refs(ref_map);
714                 return 1;
715         }
716         if (prune)
717                 prune_refs(transport, ref_map);
718         free_refs(ref_map);
719
720         /* if neither --no-tags nor --tags was specified, do automated tag
721          * following ... */
722         if (tags == TAGS_DEFAULT && autotags) {
723                 struct ref **tail = &ref_map;
724                 ref_map = NULL;
725                 find_non_local_tags(transport, &ref_map, &tail);
726                 if (ref_map) {
727                         transport_set_option(transport, TRANS_OPT_FOLLOWTAGS, NULL);
728                         transport_set_option(transport, TRANS_OPT_DEPTH, "0");
729                         fetch_refs(transport, ref_map);
730                 }
731                 free_refs(ref_map);
732         }
733
734         return 0;
735 }
736
737 static void set_option(const char *name, const char *value)
738 {
739         int r = transport_set_option(transport, name, value);
740         if (r < 0)
741                 die("Option \"%s\" value \"%s\" is not valid for %s",
742                         name, value, transport->url);
743         if (r > 0)
744                 warning("Option \"%s\" is ignored for %s\n",
745                         name, transport->url);
746 }
747
748 static int get_one_remote_for_fetch(struct remote *remote, void *priv)
749 {
750         struct string_list *list = priv;
751         if (!remote->skip_default_update)
752                 string_list_append(list, remote->name);
753         return 0;
754 }
755
756 struct remote_group_data {
757         const char *name;
758         struct string_list *list;
759 };
760
761 static int get_remote_group(const char *key, const char *value, void *priv)
762 {
763         struct remote_group_data *g = priv;
764
765         if (!prefixcmp(key, "remotes.") &&
766                         !strcmp(key + 8, g->name)) {
767                 /* split list by white space */
768                 int space = strcspn(value, " \t\n");
769                 while (*value) {
770                         if (space > 1) {
771                                 string_list_append(g->list,
772                                                    xstrndup(value, space));
773                         }
774                         value += space + (value[space] != '\0');
775                         space = strcspn(value, " \t\n");
776                 }
777         }
778
779         return 0;
780 }
781
782 static int add_remote_or_group(const char *name, struct string_list *list)
783 {
784         int prev_nr = list->nr;
785         struct remote_group_data g;
786         g.name = name; g.list = list;
787
788         git_config(get_remote_group, &g);
789         if (list->nr == prev_nr) {
790                 struct remote *remote;
791                 if (!remote_is_configured(name))
792                         return 0;
793                 remote = remote_get(name);
794                 string_list_append(list, remote->name);
795         }
796         return 1;
797 }
798
799 static void add_options_to_argv(int *argc, const char **argv)
800 {
801         if (dry_run)
802                 argv[(*argc)++] = "--dry-run";
803         if (prune)
804                 argv[(*argc)++] = "--prune";
805         if (update_head_ok)
806                 argv[(*argc)++] = "--update-head-ok";
807         if (force)
808                 argv[(*argc)++] = "--force";
809         if (keep)
810                 argv[(*argc)++] = "--keep";
811         if (recurse_submodules == RECURSE_SUBMODULES_ON)
812                 argv[(*argc)++] = "--recurse-submodules";
813         if (verbosity >= 2)
814                 argv[(*argc)++] = "-v";
815         if (verbosity >= 1)
816                 argv[(*argc)++] = "-v";
817         else if (verbosity < 0)
818                 argv[(*argc)++] = "-q";
819
820 }
821
822 static int fetch_multiple(struct string_list *list)
823 {
824         int i, result = 0;
825         const char *argv[12] = { "fetch", "--append" };
826         int argc = 2;
827
828         add_options_to_argv(&argc, argv);
829
830         if (!append && !dry_run) {
831                 int errcode = truncate_fetch_head();
832                 if (errcode)
833                         return errcode;
834         }
835
836         for (i = 0; i < list->nr; i++) {
837                 const char *name = list->items[i].string;
838                 argv[argc] = name;
839                 argv[argc + 1] = NULL;
840                 if (verbosity >= 0)
841                         printf("Fetching %s\n", name);
842                 if (run_command_v_opt(argv, RUN_GIT_CMD)) {
843                         error("Could not fetch %s", name);
844                         result = 1;
845                 }
846         }
847
848         return result;
849 }
850
851 static int fetch_one(struct remote *remote, int argc, const char **argv)
852 {
853         int i;
854         static const char **refs = NULL;
855         int ref_nr = 0;
856         int exit_code;
857
858         if (!remote)
859                 die("No remote repository specified.  Please, specify either a URL or a\n"
860                     "remote name from which new revisions should be fetched.");
861
862         transport = transport_get(remote, NULL);
863         transport_set_verbosity(transport, verbosity, progress);
864         if (upload_pack)
865                 set_option(TRANS_OPT_UPLOADPACK, upload_pack);
866         if (keep)
867                 set_option(TRANS_OPT_KEEP, "yes");
868         if (depth)
869                 set_option(TRANS_OPT_DEPTH, depth);
870
871         if (argc > 0) {
872                 int j = 0;
873                 refs = xcalloc(argc + 1, sizeof(const char *));
874                 for (i = 0; i < argc; i++) {
875                         if (!strcmp(argv[i], "tag")) {
876                                 char *ref;
877                                 i++;
878                                 if (i >= argc)
879                                         die("You need to specify a tag name.");
880                                 ref = xmalloc(strlen(argv[i]) * 2 + 22);
881                                 strcpy(ref, "refs/tags/");
882                                 strcat(ref, argv[i]);
883                                 strcat(ref, ":refs/tags/");
884                                 strcat(ref, argv[i]);
885                                 refs[j++] = ref;
886                         } else
887                                 refs[j++] = argv[i];
888                 }
889                 refs[j] = NULL;
890                 ref_nr = j;
891         }
892
893         sigchain_push_common(unlock_pack_on_signal);
894         atexit(unlock_pack);
895         exit_code = do_fetch(transport,
896                         parse_fetch_refspec(ref_nr, refs), ref_nr);
897         transport_disconnect(transport);
898         transport = NULL;
899         return exit_code;
900 }
901
902 int cmd_fetch(int argc, const char **argv, const char *prefix)
903 {
904         int i;
905         struct string_list list = STRING_LIST_INIT_NODUP;
906         struct remote *remote;
907         int result = 0;
908
909         packet_trace_identity("fetch");
910
911         /* Record the command line for the reflog */
912         strbuf_addstr(&default_rla, "fetch");
913         for (i = 1; i < argc; i++)
914                 strbuf_addf(&default_rla, " %s", argv[i]);
915
916         argc = parse_options(argc, argv, prefix,
917                              builtin_fetch_options, builtin_fetch_usage, 0);
918
919         if (all) {
920                 if (argc == 1)
921                         die("fetch --all does not take a repository argument");
922                 else if (argc > 1)
923                         die("fetch --all does not make sense with refspecs");
924                 (void) for_each_remote(get_one_remote_for_fetch, &list);
925                 result = fetch_multiple(&list);
926         } else if (argc == 0) {
927                 /* No arguments -- use default remote */
928                 remote = remote_get(NULL);
929                 result = fetch_one(remote, argc, argv);
930         } else if (multiple) {
931                 /* All arguments are assumed to be remotes or groups */
932                 for (i = 0; i < argc; i++)
933                         if (!add_remote_or_group(argv[i], &list))
934                                 die("No such remote or remote group: %s", argv[i]);
935                 result = fetch_multiple(&list);
936         } else {
937                 /* Single remote or group */
938                 (void) add_remote_or_group(argv[0], &list);
939                 if (list.nr > 1) {
940                         /* More than one remote */
941                         if (argc > 1)
942                                 die("Fetching a group and specifying refspecs does not make sense");
943                         result = fetch_multiple(&list);
944                 } else {
945                         /* Zero or one remotes */
946                         remote = remote_get(argv[0]);
947                         result = fetch_one(remote, argc-1, argv+1);
948                 }
949         }
950
951         if (!result && (recurse_submodules != RECURSE_SUBMODULES_OFF)) {
952                 const char *options[10];
953                 int num_options = 0;
954                 /* Set recursion as default when we already are recursing */
955                 if (submodule_prefix[0])
956                         set_config_fetch_recurse_submodules(1);
957                 gitmodules_config();
958                 git_config(submodule_config, NULL);
959                 add_options_to_argv(&num_options, options);
960                 result = fetch_populated_submodules(num_options, options,
961                                                     submodule_prefix,
962                                                     recurse_submodules == RECURSE_SUBMODULES_ON,
963                                                     verbosity < 0);
964         }
965
966         /* All names were strdup()ed or strndup()ed */
967         list.strdup_strings = 1;
968         string_list_clear(&list, 0);
969
970         return result;
971 }