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