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