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