Merge branch 'mf/curl-select-fdset' into maint
[git] / builtin / fetch.c
1 /*
2  * "git fetch"
3  */
4 #include "cache.h"
5 #include "refs.h"
6 #include "commit.h"
7 #include "builtin.h"
8 #include "string-list.h"
9 #include "remote.h"
10 #include "transport.h"
11 #include "run-command.h"
12 #include "parse-options.h"
13 #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                             struct strbuf *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         type = sha1_object_info(ref->new_sha1, NULL);
251         if (type < 0)
252                 die(_("object %s not found"), sha1_to_hex(ref->new_sha1));
253
254         if (!hashcmp(ref->old_sha1, ref->new_sha1)) {
255                 if (verbosity > 0)
256                         strbuf_addf(display, "= %-*s %-*s -> %s",
257                                     TRANSPORT_SUMMARY_WIDTH,
258                                     _("[up to date]"), REFCOL_WIDTH,
259                                     remote, 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                 strbuf_addf(display,
272                             _("! %-*s %-*s -> %s  (can't fetch in current branch)"),
273                             TRANSPORT_SUMMARY_WIDTH, _("[rejected]"),
274                             REFCOL_WIDTH, remote, pretty_ref);
275                 return 1;
276         }
277
278         if (!is_null_sha1(ref->old_sha1) &&
279             !prefixcmp(ref->name, "refs/tags/")) {
280                 int r;
281                 r = s_update_ref("updating tag", ref, 0);
282                 strbuf_addf(display, "%c %-*s %-*s -> %s%s",
283                             r ? '!' : '-',
284                             TRANSPORT_SUMMARY_WIDTH, _("[tag update]"),
285                             REFCOL_WIDTH, remote, pretty_ref,
286                             r ? _("  (unable to update local ref)") : "");
287                 return r;
288         }
289
290         current = lookup_commit_reference_gently(ref->old_sha1, 1);
291         updated = lookup_commit_reference_gently(ref->new_sha1, 1);
292         if (!current || !updated) {
293                 const char *msg;
294                 const char *what;
295                 int r;
296                 if (!strncmp(ref->name, "refs/tags/", 10)) {
297                         msg = "storing tag";
298                         what = _("[new tag]");
299                 }
300                 else {
301                         msg = "storing head";
302                         what = _("[new branch]");
303                         if ((recurse_submodules != RECURSE_SUBMODULES_OFF) &&
304                             (recurse_submodules != RECURSE_SUBMODULES_ON))
305                                 check_for_new_submodule_commits(ref->new_sha1);
306                 }
307
308                 r = s_update_ref(msg, ref, 0);
309                 strbuf_addf(display, "%c %-*s %-*s -> %s%s",
310                             r ? '!' : '*',
311                             TRANSPORT_SUMMARY_WIDTH, what,
312                             REFCOL_WIDTH, remote, pretty_ref,
313                             r ? _("  (unable to update local ref)") : "");
314                 return r;
315         }
316
317         if (in_merge_bases(current, &updated, 1)) {
318                 char quickref[83];
319                 int r;
320                 strcpy(quickref, find_unique_abbrev(current->object.sha1, DEFAULT_ABBREV));
321                 strcat(quickref, "..");
322                 strcat(quickref, find_unique_abbrev(ref->new_sha1, DEFAULT_ABBREV));
323                 if ((recurse_submodules != RECURSE_SUBMODULES_OFF) &&
324                     (recurse_submodules != RECURSE_SUBMODULES_ON))
325                         check_for_new_submodule_commits(ref->new_sha1);
326                 r = s_update_ref("fast-forward", ref, 1);
327                 strbuf_addf(display, "%c %-*s %-*s -> %s%s",
328                             r ? '!' : ' ',
329                             TRANSPORT_SUMMARY_WIDTH, quickref,
330                             REFCOL_WIDTH, remote, pretty_ref,
331                             r ? _("  (unable to update local ref)") : "");
332                 return r;
333         } else if (force || ref->force) {
334                 char quickref[84];
335                 int r;
336                 strcpy(quickref, find_unique_abbrev(current->object.sha1, DEFAULT_ABBREV));
337                 strcat(quickref, "...");
338                 strcat(quickref, find_unique_abbrev(ref->new_sha1, DEFAULT_ABBREV));
339                 if ((recurse_submodules != RECURSE_SUBMODULES_OFF) &&
340                     (recurse_submodules != RECURSE_SUBMODULES_ON))
341                         check_for_new_submodule_commits(ref->new_sha1);
342                 r = s_update_ref("forced-update", ref, 1);
343                 strbuf_addf(display, "%c %-*s %-*s -> %s  (%s)",
344                             r ? '!' : '+',
345                             TRANSPORT_SUMMARY_WIDTH, quickref,
346                             REFCOL_WIDTH, remote, pretty_ref,
347                             r ? _("unable to update local ref") : _("forced update"));
348                 return r;
349         } else {
350                 strbuf_addf(display, "! %-*s %-*s -> %s  %s",
351                             TRANSPORT_SUMMARY_WIDTH, _("[rejected]"),
352                             REFCOL_WIDTH, remote, pretty_ref,
353                             _("(non-fast-forward)"));
354                 return 1;
355         }
356 }
357
358 static int iterate_ref_map(void *cb_data, unsigned char sha1[20])
359 {
360         struct ref **rm = cb_data;
361         struct ref *ref = *rm;
362
363         if (!ref)
364                 return -1; /* end of the list */
365         *rm = ref->next;
366         hashcpy(sha1, ref->old_sha1);
367         return 0;
368 }
369
370 static int store_updated_refs(const char *raw_url, const char *remote_name,
371                 struct ref *ref_map)
372 {
373         FILE *fp;
374         struct commit *commit;
375         int url_len, i, shown_url = 0, rc = 0;
376         struct strbuf note = STRBUF_INIT;
377         const char *what, *kind;
378         struct ref *rm;
379         char *url, *filename = dry_run ? "/dev/null" : git_path("FETCH_HEAD");
380
381         fp = fopen(filename, "a");
382         if (!fp)
383                 return error(_("cannot open %s: %s\n"), filename, strerror(errno));
384
385         if (raw_url)
386                 url = transport_anonymize_url(raw_url);
387         else
388                 url = xstrdup("foreign");
389
390         rm = ref_map;
391         if (check_everything_connected(iterate_ref_map, 0, &rm)) {
392                 rc = error(_("%s did not send all necessary objects\n"), url);
393                 goto abort;
394         }
395
396         for (rm = ref_map; rm; rm = rm->next) {
397                 struct ref *ref = NULL;
398
399                 if (rm->peer_ref) {
400                         ref = xcalloc(1, sizeof(*ref) + strlen(rm->peer_ref->name) + 1);
401                         strcpy(ref->name, rm->peer_ref->name);
402                         hashcpy(ref->old_sha1, rm->peer_ref->old_sha1);
403                         hashcpy(ref->new_sha1, rm->old_sha1);
404                         ref->force = rm->peer_ref->force;
405                 }
406
407                 commit = lookup_commit_reference_gently(rm->old_sha1, 1);
408                 if (!commit)
409                         rm->merge = 0;
410
411                 if (!strcmp(rm->name, "HEAD")) {
412                         kind = "";
413                         what = "";
414                 }
415                 else if (!prefixcmp(rm->name, "refs/heads/")) {
416                         kind = "branch";
417                         what = rm->name + 11;
418                 }
419                 else if (!prefixcmp(rm->name, "refs/tags/")) {
420                         kind = "tag";
421                         what = rm->name + 10;
422                 }
423                 else if (!prefixcmp(rm->name, "refs/remotes/")) {
424                         kind = "remote-tracking branch";
425                         what = rm->name + 13;
426                 }
427                 else {
428                         kind = "";
429                         what = rm->name;
430                 }
431
432                 url_len = strlen(url);
433                 for (i = url_len - 1; url[i] == '/' && 0 <= i; i--)
434                         ;
435                 url_len = i + 1;
436                 if (4 < i && !strncmp(".git", url + i - 3, 4))
437                         url_len = i - 3;
438
439                 strbuf_reset(&note);
440                 if (*what) {
441                         if (*kind)
442                                 strbuf_addf(&note, "%s ", kind);
443                         strbuf_addf(&note, "'%s' of ", what);
444                 }
445                 fprintf(fp, "%s\t%s\t%s",
446                         sha1_to_hex(commit ? commit->object.sha1 :
447                                     rm->old_sha1),
448                         rm->merge ? "" : "not-for-merge",
449                         note.buf);
450                 for (i = 0; i < url_len; ++i)
451                         if ('\n' == url[i])
452                                 fputs("\\n", fp);
453                         else
454                                 fputc(url[i], fp);
455                 fputc('\n', fp);
456
457                 strbuf_reset(&note);
458                 if (ref) {
459                         rc |= update_local_ref(ref, what, &note);
460                         free(ref);
461                 } else
462                         strbuf_addf(&note, "* %-*s %-*s -> FETCH_HEAD",
463                                     TRANSPORT_SUMMARY_WIDTH,
464                                     *kind ? kind : "branch",
465                                     REFCOL_WIDTH,
466                                     *what ? what : "HEAD");
467                 if (note.len) {
468                         if (verbosity >= 0 && !shown_url) {
469                                 fprintf(stderr, _("From %.*s\n"),
470                                                 url_len, url);
471                                 shown_url = 1;
472                         }
473                         if (verbosity >= 0)
474                                 fprintf(stderr, " %s\n", note.buf);
475                 }
476         }
477
478         if (rc & STORE_REF_ERROR_DF_CONFLICT)
479                 error(_("some local refs could not be updated; try running\n"
480                       " 'git remote prune %s' to remove any old, conflicting "
481                       "branches"), remote_name);
482
483  abort:
484         strbuf_release(&note);
485         free(url);
486         fclose(fp);
487         return rc;
488 }
489
490 /*
491  * We would want to bypass the object transfer altogether if
492  * everything we are going to fetch already exists and is connected
493  * locally.
494  */
495 static int quickfetch(struct ref *ref_map)
496 {
497         struct ref *rm = ref_map;
498
499         /*
500          * If we are deepening a shallow clone we already have these
501          * objects reachable.  Running rev-list here will return with
502          * a good (0) exit status and we'll bypass the fetch that we
503          * really need to perform.  Claiming failure now will ensure
504          * we perform the network exchange to deepen our history.
505          */
506         if (depth)
507                 return -1;
508         return check_everything_connected(iterate_ref_map, 1, &rm);
509 }
510
511 static int fetch_refs(struct transport *transport, struct ref *ref_map)
512 {
513         int ret = quickfetch(ref_map);
514         if (ret)
515                 ret = transport_fetch_refs(transport, ref_map);
516         if (!ret)
517                 ret |= store_updated_refs(transport->url,
518                                 transport->remote->name,
519                                 ref_map);
520         transport_unlock_pack(transport);
521         return ret;
522 }
523
524 static int prune_refs(struct refspec *refs, int ref_count, struct ref *ref_map)
525 {
526         int result = 0;
527         struct ref *ref, *stale_refs = get_stale_heads(refs, ref_count, ref_map);
528         const char *dangling_msg = dry_run
529                 ? _("   (%s will become dangling)\n")
530                 : _("   (%s has become dangling)\n");
531
532         for (ref = stale_refs; ref; ref = ref->next) {
533                 if (!dry_run)
534                         result |= delete_ref(ref->name, NULL, 0);
535                 if (verbosity >= 0) {
536                         fprintf(stderr, " x %-*s %-*s -> %s\n",
537                                 TRANSPORT_SUMMARY_WIDTH, _("[deleted]"),
538                                 REFCOL_WIDTH, _("(none)"), prettify_refname(ref->name));
539                         warn_dangling_symref(stderr, dangling_msg, ref->name);
540                 }
541         }
542         free_refs(stale_refs);
543         return result;
544 }
545
546 static int add_existing(const char *refname, const unsigned char *sha1,
547                         int flag, void *cbdata)
548 {
549         struct string_list *list = (struct string_list *)cbdata;
550         struct string_list_item *item = string_list_insert(list, refname);
551         item->util = (void *)sha1;
552         return 0;
553 }
554
555 static int will_fetch(struct ref **head, const unsigned char *sha1)
556 {
557         struct ref *rm = *head;
558         while (rm) {
559                 if (!hashcmp(rm->old_sha1, sha1))
560                         return 1;
561                 rm = rm->next;
562         }
563         return 0;
564 }
565
566 static void find_non_local_tags(struct transport *transport,
567                         struct ref **head,
568                         struct ref ***tail)
569 {
570         struct string_list existing_refs = STRING_LIST_INIT_NODUP;
571         struct string_list remote_refs = STRING_LIST_INIT_NODUP;
572         const struct ref *ref;
573         struct string_list_item *item = NULL;
574
575         for_each_ref(add_existing, &existing_refs);
576         for (ref = transport_get_remote_refs(transport); ref; ref = ref->next) {
577                 if (prefixcmp(ref->name, "refs/tags"))
578                         continue;
579
580                 /*
581                  * The peeled ref always follows the matching base
582                  * ref, so if we see a peeled ref that we don't want
583                  * to fetch then we can mark the ref entry in the list
584                  * as one to ignore by setting util to NULL.
585                  */
586                 if (!suffixcmp(ref->name, "^{}")) {
587                         if (item && !has_sha1_file(ref->old_sha1) &&
588                             !will_fetch(head, ref->old_sha1) &&
589                             !has_sha1_file(item->util) &&
590                             !will_fetch(head, item->util))
591                                 item->util = NULL;
592                         item = NULL;
593                         continue;
594                 }
595
596                 /*
597                  * If item is non-NULL here, then we previously saw a
598                  * ref not followed by a peeled reference, so we need
599                  * to check if it is a lightweight tag that we want to
600                  * fetch.
601                  */
602                 if (item && !has_sha1_file(item->util) &&
603                     !will_fetch(head, item->util))
604                         item->util = NULL;
605
606                 item = NULL;
607
608                 /* skip duplicates and refs that we already have */
609                 if (string_list_has_string(&remote_refs, ref->name) ||
610                     string_list_has_string(&existing_refs, ref->name))
611                         continue;
612
613                 item = string_list_insert(&remote_refs, ref->name);
614                 item->util = (void *)ref->old_sha1;
615         }
616         string_list_clear(&existing_refs, 0);
617
618         /*
619          * We may have a final lightweight tag that needs to be
620          * checked to see if it needs fetching.
621          */
622         if (item && !has_sha1_file(item->util) &&
623             !will_fetch(head, item->util))
624                 item->util = NULL;
625
626         /*
627          * For all the tags in the remote_refs string list,
628          * add them to the list of refs to be fetched
629          */
630         for_each_string_list_item(item, &remote_refs) {
631                 /* Unless we have already decided to ignore this item... */
632                 if (item->util)
633                 {
634                         struct ref *rm = alloc_ref(item->string);
635                         rm->peer_ref = alloc_ref(item->string);
636                         hashcpy(rm->old_sha1, item->util);
637                         **tail = rm;
638                         *tail = &rm->next;
639                 }
640         }
641
642         string_list_clear(&remote_refs, 0);
643 }
644
645 static void check_not_current_branch(struct ref *ref_map)
646 {
647         struct branch *current_branch = branch_get(NULL);
648
649         if (is_bare_repository() || !current_branch)
650                 return;
651
652         for (; ref_map; ref_map = ref_map->next)
653                 if (ref_map->peer_ref && !strcmp(current_branch->refname,
654                                         ref_map->peer_ref->name))
655                         die(_("Refusing to fetch into current branch %s "
656                             "of non-bare repository"), current_branch->refname);
657 }
658
659 static int truncate_fetch_head(void)
660 {
661         char *filename = git_path("FETCH_HEAD");
662         FILE *fp = fopen(filename, "w");
663
664         if (!fp)
665                 return error(_("cannot open %s: %s\n"), filename, strerror(errno));
666         fclose(fp);
667         return 0;
668 }
669
670 static int do_fetch(struct transport *transport,
671                     struct refspec *refs, int ref_count)
672 {
673         struct string_list existing_refs = STRING_LIST_INIT_NODUP;
674         struct string_list_item *peer_item = NULL;
675         struct ref *ref_map;
676         struct ref *rm;
677         int autotags = (transport->remote->fetch_tags == 1);
678
679         for_each_ref(add_existing, &existing_refs);
680
681         if (tags == TAGS_DEFAULT) {
682                 if (transport->remote->fetch_tags == 2)
683                         tags = TAGS_SET;
684                 if (transport->remote->fetch_tags == -1)
685                         tags = TAGS_UNSET;
686         }
687
688         if (!transport->get_refs_list || !transport->fetch)
689                 die(_("Don't know how to fetch from %s"), transport->url);
690
691         /* if not appending, truncate FETCH_HEAD */
692         if (!append && !dry_run) {
693                 int errcode = truncate_fetch_head();
694                 if (errcode)
695                         return errcode;
696         }
697
698         ref_map = get_ref_map(transport, refs, ref_count, tags, &autotags);
699         if (!update_head_ok)
700                 check_not_current_branch(ref_map);
701
702         for (rm = ref_map; rm; rm = rm->next) {
703                 if (rm->peer_ref) {
704                         peer_item = string_list_lookup(&existing_refs,
705                                                        rm->peer_ref->name);
706                         if (peer_item)
707                                 hashcpy(rm->peer_ref->old_sha1,
708                                         peer_item->util);
709                 }
710         }
711
712         if (tags == TAGS_DEFAULT && autotags)
713                 transport_set_option(transport, TRANS_OPT_FOLLOWTAGS, "1");
714         if (fetch_refs(transport, ref_map)) {
715                 free_refs(ref_map);
716                 return 1;
717         }
718         if (prune) {
719                 /* If --tags was specified, pretend the user gave us the canonical tags refspec */
720                 if (tags == TAGS_SET) {
721                         const char *tags_str = "refs/tags/*:refs/tags/*";
722                         struct refspec *tags_refspec, *refspec;
723
724                         /* Copy the refspec and add the tags to it */
725                         refspec = xcalloc(ref_count + 1, sizeof(struct refspec));
726                         tags_refspec = parse_fetch_refspec(1, &tags_str);
727                         memcpy(refspec, refs, ref_count * sizeof(struct refspec));
728                         memcpy(&refspec[ref_count], tags_refspec, sizeof(struct refspec));
729                         ref_count++;
730
731                         prune_refs(refspec, ref_count, ref_map);
732
733                         ref_count--;
734                         /* The rest of the strings belong to fetch_one */
735                         free_refspec(1, tags_refspec);
736                         free(refspec);
737                 } else if (ref_count) {
738                         prune_refs(refs, ref_count, ref_map);
739                 } else {
740                         prune_refs(transport->remote->fetch, transport->remote->fetch_refspec_nr, ref_map);
741                 }
742         }
743         free_refs(ref_map);
744
745         /* if neither --no-tags nor --tags was specified, do automated tag
746          * following ... */
747         if (tags == TAGS_DEFAULT && autotags) {
748                 struct ref **tail = &ref_map;
749                 ref_map = NULL;
750                 find_non_local_tags(transport, &ref_map, &tail);
751                 if (ref_map) {
752                         transport_set_option(transport, TRANS_OPT_FOLLOWTAGS, NULL);
753                         transport_set_option(transport, TRANS_OPT_DEPTH, "0");
754                         fetch_refs(transport, ref_map);
755                 }
756                 free_refs(ref_map);
757         }
758
759         return 0;
760 }
761
762 static void set_option(const char *name, const char *value)
763 {
764         int r = transport_set_option(transport, name, value);
765         if (r < 0)
766                 die(_("Option \"%s\" value \"%s\" is not valid for %s"),
767                         name, value, transport->url);
768         if (r > 0)
769                 warning(_("Option \"%s\" is ignored for %s\n"),
770                         name, transport->url);
771 }
772
773 static int get_one_remote_for_fetch(struct remote *remote, void *priv)
774 {
775         struct string_list *list = priv;
776         if (!remote->skip_default_update)
777                 string_list_append(list, remote->name);
778         return 0;
779 }
780
781 struct remote_group_data {
782         const char *name;
783         struct string_list *list;
784 };
785
786 static int get_remote_group(const char *key, const char *value, void *priv)
787 {
788         struct remote_group_data *g = priv;
789
790         if (!prefixcmp(key, "remotes.") &&
791                         !strcmp(key + 8, g->name)) {
792                 /* split list by white space */
793                 int space = strcspn(value, " \t\n");
794                 while (*value) {
795                         if (space > 1) {
796                                 string_list_append(g->list,
797                                                    xstrndup(value, space));
798                         }
799                         value += space + (value[space] != '\0');
800                         space = strcspn(value, " \t\n");
801                 }
802         }
803
804         return 0;
805 }
806
807 static int add_remote_or_group(const char *name, struct string_list *list)
808 {
809         int prev_nr = list->nr;
810         struct remote_group_data g;
811         g.name = name; g.list = list;
812
813         git_config(get_remote_group, &g);
814         if (list->nr == prev_nr) {
815                 struct remote *remote;
816                 if (!remote_is_configured(name))
817                         return 0;
818                 remote = remote_get(name);
819                 string_list_append(list, remote->name);
820         }
821         return 1;
822 }
823
824 static void add_options_to_argv(int *argc, const char **argv)
825 {
826         if (dry_run)
827                 argv[(*argc)++] = "--dry-run";
828         if (prune)
829                 argv[(*argc)++] = "--prune";
830         if (update_head_ok)
831                 argv[(*argc)++] = "--update-head-ok";
832         if (force)
833                 argv[(*argc)++] = "--force";
834         if (keep)
835                 argv[(*argc)++] = "--keep";
836         if (recurse_submodules == RECURSE_SUBMODULES_ON)
837                 argv[(*argc)++] = "--recurse-submodules";
838         else if (recurse_submodules == RECURSE_SUBMODULES_ON_DEMAND)
839                 argv[(*argc)++] = "--recurse-submodules=on-demand";
840         if (verbosity >= 2)
841                 argv[(*argc)++] = "-v";
842         if (verbosity >= 1)
843                 argv[(*argc)++] = "-v";
844         else if (verbosity < 0)
845                 argv[(*argc)++] = "-q";
846
847 }
848
849 static int fetch_multiple(struct string_list *list)
850 {
851         int i, result = 0;
852         const char *argv[12] = { "fetch", "--append" };
853         int argc = 2;
854
855         add_options_to_argv(&argc, argv);
856
857         if (!append && !dry_run) {
858                 int errcode = truncate_fetch_head();
859                 if (errcode)
860                         return errcode;
861         }
862
863         for (i = 0; i < list->nr; i++) {
864                 const char *name = list->items[i].string;
865                 argv[argc] = name;
866                 argv[argc + 1] = NULL;
867                 if (verbosity >= 0)
868                         printf(_("Fetching %s\n"), name);
869                 if (run_command_v_opt(argv, RUN_GIT_CMD)) {
870                         error(_("Could not fetch %s"), name);
871                         result = 1;
872                 }
873         }
874
875         return result;
876 }
877
878 static int fetch_one(struct remote *remote, int argc, const char **argv)
879 {
880         int i;
881         static const char **refs = NULL;
882         struct refspec *refspec;
883         int ref_nr = 0;
884         int exit_code;
885
886         if (!remote)
887                 die(_("No remote repository specified.  Please, specify either a URL or a\n"
888                     "remote name from which new revisions should be fetched."));
889
890         transport = transport_get(remote, NULL);
891         transport_set_verbosity(transport, verbosity, progress);
892         if (upload_pack)
893                 set_option(TRANS_OPT_UPLOADPACK, upload_pack);
894         if (keep)
895                 set_option(TRANS_OPT_KEEP, "yes");
896         if (depth)
897                 set_option(TRANS_OPT_DEPTH, depth);
898
899         if (argc > 0) {
900                 int j = 0;
901                 refs = xcalloc(argc + 1, sizeof(const char *));
902                 for (i = 0; i < argc; i++) {
903                         if (!strcmp(argv[i], "tag")) {
904                                 char *ref;
905                                 i++;
906                                 if (i >= argc)
907                                         die(_("You need to specify a tag name."));
908                                 ref = xmalloc(strlen(argv[i]) * 2 + 22);
909                                 strcpy(ref, "refs/tags/");
910                                 strcat(ref, argv[i]);
911                                 strcat(ref, ":refs/tags/");
912                                 strcat(ref, argv[i]);
913                                 refs[j++] = ref;
914                         } else
915                                 refs[j++] = argv[i];
916                 }
917                 refs[j] = NULL;
918                 ref_nr = j;
919         }
920
921         sigchain_push_common(unlock_pack_on_signal);
922         atexit(unlock_pack);
923         refspec = parse_fetch_refspec(ref_nr, refs);
924         exit_code = do_fetch(transport, refspec, ref_nr);
925         free_refspec(ref_nr, refspec);
926         transport_disconnect(transport);
927         transport = NULL;
928         return exit_code;
929 }
930
931 int cmd_fetch(int argc, const char **argv, const char *prefix)
932 {
933         int i;
934         struct string_list list = STRING_LIST_INIT_NODUP;
935         struct remote *remote;
936         int result = 0;
937
938         packet_trace_identity("fetch");
939
940         /* Record the command line for the reflog */
941         strbuf_addstr(&default_rla, "fetch");
942         for (i = 1; i < argc; i++)
943                 strbuf_addf(&default_rla, " %s", argv[i]);
944
945         argc = parse_options(argc, argv, prefix,
946                              builtin_fetch_options, builtin_fetch_usage, 0);
947
948         if (recurse_submodules != RECURSE_SUBMODULES_OFF) {
949                 if (recurse_submodules_default) {
950                         int arg = parse_fetch_recurse_submodules_arg("--recurse-submodules-default", recurse_submodules_default);
951                         set_config_fetch_recurse_submodules(arg);
952                 }
953                 gitmodules_config();
954                 git_config(submodule_config, NULL);
955         }
956
957         if (all) {
958                 if (argc == 1)
959                         die(_("fetch --all does not take a repository argument"));
960                 else if (argc > 1)
961                         die(_("fetch --all does not make sense with refspecs"));
962                 (void) for_each_remote(get_one_remote_for_fetch, &list);
963                 result = fetch_multiple(&list);
964         } else if (argc == 0) {
965                 /* No arguments -- use default remote */
966                 remote = remote_get(NULL);
967                 result = fetch_one(remote, argc, argv);
968         } else if (multiple) {
969                 /* All arguments are assumed to be remotes or groups */
970                 for (i = 0; i < argc; i++)
971                         if (!add_remote_or_group(argv[i], &list))
972                                 die(_("No such remote or remote group: %s"), argv[i]);
973                 result = fetch_multiple(&list);
974         } else {
975                 /* Single remote or group */
976                 (void) add_remote_or_group(argv[0], &list);
977                 if (list.nr > 1) {
978                         /* More than one remote */
979                         if (argc > 1)
980                                 die(_("Fetching a group and specifying refspecs does not make sense"));
981                         result = fetch_multiple(&list);
982                 } else {
983                         /* Zero or one remotes */
984                         remote = remote_get(argv[0]);
985                         result = fetch_one(remote, argc-1, argv+1);
986                 }
987         }
988
989         if (!result && (recurse_submodules != RECURSE_SUBMODULES_OFF)) {
990                 const char *options[10];
991                 int num_options = 0;
992                 add_options_to_argv(&num_options, options);
993                 result = fetch_populated_submodules(num_options, options,
994                                                     submodule_prefix,
995                                                     recurse_submodules,
996                                                     verbosity < 0);
997         }
998
999         /* All names were strdup()ed or strndup()ed */
1000         list.strdup_strings = 1;
1001         string_list_clear(&list, 0);
1002
1003         return result;
1004 }