Merge branch 'jc/t5516-pushInsteadOf-vs-pushURL'
[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 #include "argv-array.h"
18
19 static const char * const builtin_fetch_usage[] = {
20         N_("git fetch [<options>] [<repository> [<refspec>...]]"),
21         N_("git fetch [<options>] <group>"),
22         N_("git fetch --multiple [<options>] [(<repository> | <group>)...]"),
23         N_("git fetch --all [<options>]"),
24         NULL
25 };
26
27 enum {
28         TAGS_UNSET = 0,
29         TAGS_DEFAULT = 1,
30         TAGS_SET = 2
31 };
32
33 static int all, append, dry_run, force, keep, multiple, prune, update_head_ok, verbosity;
34 static int progress = -1, recurse_submodules = RECURSE_SUBMODULES_DEFAULT;
35 static int tags = TAGS_DEFAULT, unshallow;
36 static const char *depth;
37 static const char *upload_pack;
38 static struct strbuf default_rla = STRBUF_INIT;
39 static struct transport *transport;
40 static const char *submodule_prefix = "";
41 static const char *recurse_submodules_default;
42
43 static int option_parse_recurse_submodules(const struct option *opt,
44                                    const char *arg, int unset)
45 {
46         if (unset) {
47                 recurse_submodules = RECURSE_SUBMODULES_OFF;
48         } else {
49                 if (arg)
50                         recurse_submodules = parse_fetch_recurse_submodules_arg(opt->long_name, arg);
51                 else
52                         recurse_submodules = RECURSE_SUBMODULES_ON;
53         }
54         return 0;
55 }
56
57 static struct option builtin_fetch_options[] = {
58         OPT__VERBOSITY(&verbosity),
59         OPT_BOOLEAN(0, "all", &all,
60                     N_("fetch from all remotes")),
61         OPT_BOOLEAN('a', "append", &append,
62                     N_("append to .git/FETCH_HEAD instead of overwriting")),
63         OPT_STRING(0, "upload-pack", &upload_pack, N_("path"),
64                    N_("path to upload pack on remote end")),
65         OPT__FORCE(&force, N_("force overwrite of local branch")),
66         OPT_BOOLEAN('m', "multiple", &multiple,
67                     N_("fetch from multiple remotes")),
68         OPT_SET_INT('t', "tags", &tags,
69                     N_("fetch all tags and associated objects"), TAGS_SET),
70         OPT_SET_INT('n', NULL, &tags,
71                     N_("do not fetch all tags (--no-tags)"), TAGS_UNSET),
72         OPT_BOOLEAN('p', "prune", &prune,
73                     N_("prune remote-tracking branches no longer on remote")),
74         { OPTION_CALLBACK, 0, "recurse-submodules", NULL, N_("on-demand"),
75                     N_("control recursive fetching of submodules"),
76                     PARSE_OPT_OPTARG, option_parse_recurse_submodules },
77         OPT_BOOLEAN(0, "dry-run", &dry_run,
78                     N_("dry run")),
79         OPT_BOOLEAN('k', "keep", &keep, N_("keep downloaded pack")),
80         OPT_BOOLEAN('u', "update-head-ok", &update_head_ok,
81                     N_("allow updating of HEAD ref")),
82         OPT_BOOL(0, "progress", &progress, N_("force progress reporting")),
83         OPT_STRING(0, "depth", &depth, N_("depth"),
84                    N_("deepen history of shallow clone")),
85         { OPTION_SET_INT, 0, "unshallow", &unshallow, NULL,
86                    N_("convert to a complete repository"),
87                    PARSE_OPT_NONEG | PARSE_OPT_NOARG, NULL, 1 },
88         { OPTION_STRING, 0, "submodule-prefix", &submodule_prefix, N_("dir"),
89                    N_("prepend this to submodule path output"), PARSE_OPT_HIDDEN },
90         { OPTION_STRING, 0, "recurse-submodules-default",
91                    &recurse_submodules_default, NULL,
92                    N_("default mode for recursion"), PARSE_OPT_HIDDEN },
93         OPT_END()
94 };
95
96 static void unlock_pack(void)
97 {
98         if (transport)
99                 transport_unlock_pack(transport);
100 }
101
102 static void unlock_pack_on_signal(int signo)
103 {
104         unlock_pack();
105         sigchain_pop(signo);
106         raise(signo);
107 }
108
109 static void add_merge_config(struct ref **head,
110                            const struct ref *remote_refs,
111                            struct branch *branch,
112                            struct ref ***tail)
113 {
114         int i;
115
116         for (i = 0; i < branch->merge_nr; i++) {
117                 struct ref *rm, **old_tail = *tail;
118                 struct refspec refspec;
119
120                 for (rm = *head; rm; rm = rm->next) {
121                         if (branch_merge_matches(branch, i, rm->name)) {
122                                 rm->merge = 1;
123                                 break;
124                         }
125                 }
126                 if (rm)
127                         continue;
128
129                 /*
130                  * Not fetched to a remote-tracking branch?  We need to fetch
131                  * it anyway to allow this branch's "branch.$name.merge"
132                  * to be honored by 'git pull', but we do not have to
133                  * fail if branch.$name.merge is misconfigured to point
134                  * at a nonexisting branch.  If we were indeed called by
135                  * 'git pull', it will notice the misconfiguration because
136                  * there is no entry in the resulting FETCH_HEAD marked
137                  * for merging.
138                  */
139                 memset(&refspec, 0, sizeof(refspec));
140                 refspec.src = branch->merge[i]->src;
141                 get_fetch_map(remote_refs, &refspec, tail, 1);
142                 for (rm = *old_tail; rm; rm = rm->next)
143                         rm->merge = 1;
144         }
145 }
146
147 static void find_non_local_tags(struct transport *transport,
148                         struct ref **head,
149                         struct ref ***tail);
150
151 static struct ref *get_ref_map(struct transport *transport,
152                                struct refspec *refs, int ref_count, int tags,
153                                int *autotags)
154 {
155         int i;
156         struct ref *rm;
157         struct ref *ref_map = NULL;
158         struct ref **tail = &ref_map;
159
160         const struct ref *remote_refs = transport_get_remote_refs(transport);
161
162         if (ref_count || tags == TAGS_SET) {
163                 for (i = 0; i < ref_count; i++) {
164                         get_fetch_map(remote_refs, &refs[i], &tail, 0);
165                         if (refs[i].dst && refs[i].dst[0])
166                                 *autotags = 1;
167                 }
168                 /* Merge everything on the command line, but not --tags */
169                 for (rm = ref_map; rm; rm = rm->next)
170                         rm->merge = 1;
171                 if (tags == TAGS_SET)
172                         get_fetch_map(remote_refs, tag_refspec, &tail, 0);
173         } else {
174                 /* Use the defaults */
175                 struct remote *remote = transport->remote;
176                 struct branch *branch = branch_get(NULL);
177                 int has_merge = branch_has_merge_config(branch);
178                 if (remote &&
179                     (remote->fetch_refspec_nr ||
180                      /* Note: has_merge implies non-NULL branch->remote_name */
181                      (has_merge && !strcmp(branch->remote_name, remote->name)))) {
182                         for (i = 0; i < remote->fetch_refspec_nr; i++) {
183                                 get_fetch_map(remote_refs, &remote->fetch[i], &tail, 0);
184                                 if (remote->fetch[i].dst &&
185                                     remote->fetch[i].dst[0])
186                                         *autotags = 1;
187                                 if (!i && !has_merge && ref_map &&
188                                     !remote->fetch[0].pattern)
189                                         ref_map->merge = 1;
190                         }
191                         /*
192                          * if the remote we're fetching from is the same
193                          * as given in branch.<name>.remote, we add the
194                          * ref given in branch.<name>.merge, too.
195                          *
196                          * Note: has_merge implies non-NULL branch->remote_name
197                          */
198                         if (has_merge &&
199                             !strcmp(branch->remote_name, remote->name))
200                                 add_merge_config(&ref_map, remote_refs, branch, &tail);
201                 } else {
202                         ref_map = get_remote_ref(remote_refs, "HEAD");
203                         if (!ref_map)
204                                 die(_("Couldn't find remote ref HEAD"));
205                         ref_map->merge = 1;
206                         tail = &ref_map->next;
207                 }
208         }
209         if (tags == TAGS_DEFAULT && *autotags)
210                 find_non_local_tags(transport, &ref_map, &tail);
211         ref_remove_duplicates(ref_map);
212
213         return ref_map;
214 }
215
216 #define STORE_REF_ERROR_OTHER 1
217 #define STORE_REF_ERROR_DF_CONFLICT 2
218
219 static int s_update_ref(const char *action,
220                         struct ref *ref,
221                         int check_old)
222 {
223         char msg[1024];
224         char *rla = getenv("GIT_REFLOG_ACTION");
225         static struct ref_lock *lock;
226
227         if (dry_run)
228                 return 0;
229         if (!rla)
230                 rla = default_rla.buf;
231         snprintf(msg, sizeof(msg), "%s: %s", rla, action);
232         lock = lock_any_ref_for_update(ref->name,
233                                        check_old ? ref->old_sha1 : NULL, 0);
234         if (!lock)
235                 return errno == ENOTDIR ? STORE_REF_ERROR_DF_CONFLICT :
236                                           STORE_REF_ERROR_OTHER;
237         if (write_ref_sha1(lock, ref->new_sha1, msg) < 0)
238                 return errno == ENOTDIR ? STORE_REF_ERROR_DF_CONFLICT :
239                                           STORE_REF_ERROR_OTHER;
240         return 0;
241 }
242
243 #define REFCOL_WIDTH  10
244
245 static int update_local_ref(struct ref *ref,
246                             const char *remote,
247                             const struct ref *remote_ref,
248                             struct strbuf *display)
249 {
250         struct commit *current = NULL, *updated;
251         enum object_type type;
252         struct branch *current_branch = branch_get(NULL);
253         const char *pretty_ref = prettify_refname(ref->name);
254
255         type = sha1_object_info(ref->new_sha1, NULL);
256         if (type < 0)
257                 die(_("object %s not found"), sha1_to_hex(ref->new_sha1));
258
259         if (!hashcmp(ref->old_sha1, ref->new_sha1)) {
260                 if (verbosity > 0)
261                         strbuf_addf(display, "= %-*s %-*s -> %s",
262                                     TRANSPORT_SUMMARY(_("[up to date]")),
263                                     REFCOL_WIDTH, remote, pretty_ref);
264                 return 0;
265         }
266
267         if (current_branch &&
268             !strcmp(ref->name, current_branch->name) &&
269             !(update_head_ok || is_bare_repository()) &&
270             !is_null_sha1(ref->old_sha1)) {
271                 /*
272                  * If this is the head, and it's not okay to update
273                  * the head, and the old value of the head isn't empty...
274                  */
275                 strbuf_addf(display,
276                             _("! %-*s %-*s -> %s  (can't fetch in current branch)"),
277                             TRANSPORT_SUMMARY(_("[rejected]")),
278                             REFCOL_WIDTH, remote, pretty_ref);
279                 return 1;
280         }
281
282         if (!is_null_sha1(ref->old_sha1) &&
283             !prefixcmp(ref->name, "refs/tags/")) {
284                 int r;
285                 r = s_update_ref("updating tag", ref, 0);
286                 strbuf_addf(display, "%c %-*s %-*s -> %s%s",
287                             r ? '!' : '-',
288                             TRANSPORT_SUMMARY(_("[tag update]")),
289                             REFCOL_WIDTH, remote, pretty_ref,
290                             r ? _("  (unable to update local ref)") : "");
291                 return r;
292         }
293
294         current = lookup_commit_reference_gently(ref->old_sha1, 1);
295         updated = lookup_commit_reference_gently(ref->new_sha1, 1);
296         if (!current || !updated) {
297                 const char *msg;
298                 const char *what;
299                 int r;
300                 /*
301                  * Nicely describe the new ref we're fetching.
302                  * Base this on the remote's ref name, as it's
303                  * more likely to follow a standard layout.
304                  */
305                 const char *name = remote_ref ? remote_ref->name : "";
306                 if (!prefixcmp(name, "refs/tags/")) {
307                         msg = "storing tag";
308                         what = _("[new tag]");
309                 } else if (!prefixcmp(name, "refs/heads/")) {
310                         msg = "storing head";
311                         what = _("[new branch]");
312                 } else {
313                         msg = "storing ref";
314                         what = _("[new ref]");
315                 }
316
317                 if ((recurse_submodules != RECURSE_SUBMODULES_OFF) &&
318                     (recurse_submodules != RECURSE_SUBMODULES_ON))
319                         check_for_new_submodule_commits(ref->new_sha1);
320                 r = s_update_ref(msg, ref, 0);
321                 strbuf_addf(display, "%c %-*s %-*s -> %s%s",
322                             r ? '!' : '*',
323                             TRANSPORT_SUMMARY(what),
324                             REFCOL_WIDTH, remote, pretty_ref,
325                             r ? _("  (unable to update local ref)") : "");
326                 return r;
327         }
328
329         if (in_merge_bases(current, updated)) {
330                 char quickref[83];
331                 int r;
332                 strcpy(quickref, find_unique_abbrev(current->object.sha1, DEFAULT_ABBREV));
333                 strcat(quickref, "..");
334                 strcat(quickref, find_unique_abbrev(ref->new_sha1, DEFAULT_ABBREV));
335                 if ((recurse_submodules != RECURSE_SUBMODULES_OFF) &&
336                     (recurse_submodules != RECURSE_SUBMODULES_ON))
337                         check_for_new_submodule_commits(ref->new_sha1);
338                 r = s_update_ref("fast-forward", ref, 1);
339                 strbuf_addf(display, "%c %-*s %-*s -> %s%s",
340                             r ? '!' : ' ',
341                             TRANSPORT_SUMMARY_WIDTH, quickref,
342                             REFCOL_WIDTH, remote, pretty_ref,
343                             r ? _("  (unable to update local ref)") : "");
344                 return r;
345         } else if (force || ref->force) {
346                 char quickref[84];
347                 int r;
348                 strcpy(quickref, find_unique_abbrev(current->object.sha1, DEFAULT_ABBREV));
349                 strcat(quickref, "...");
350                 strcat(quickref, find_unique_abbrev(ref->new_sha1, DEFAULT_ABBREV));
351                 if ((recurse_submodules != RECURSE_SUBMODULES_OFF) &&
352                     (recurse_submodules != RECURSE_SUBMODULES_ON))
353                         check_for_new_submodule_commits(ref->new_sha1);
354                 r = s_update_ref("forced-update", ref, 1);
355                 strbuf_addf(display, "%c %-*s %-*s -> %s  (%s)",
356                             r ? '!' : '+',
357                             TRANSPORT_SUMMARY_WIDTH, quickref,
358                             REFCOL_WIDTH, remote, pretty_ref,
359                             r ? _("unable to update local ref") : _("forced update"));
360                 return r;
361         } else {
362                 strbuf_addf(display, "! %-*s %-*s -> %s  %s",
363                             TRANSPORT_SUMMARY(_("[rejected]")),
364                             REFCOL_WIDTH, remote, pretty_ref,
365                             _("(non-fast-forward)"));
366                 return 1;
367         }
368 }
369
370 static int iterate_ref_map(void *cb_data, unsigned char sha1[20])
371 {
372         struct ref **rm = cb_data;
373         struct ref *ref = *rm;
374
375         if (!ref)
376                 return -1; /* end of the list */
377         *rm = ref->next;
378         hashcpy(sha1, ref->old_sha1);
379         return 0;
380 }
381
382 static int store_updated_refs(const char *raw_url, const char *remote_name,
383                 struct ref *ref_map)
384 {
385         FILE *fp;
386         struct commit *commit;
387         int url_len, i, shown_url = 0, rc = 0;
388         struct strbuf note = STRBUF_INIT;
389         const char *what, *kind;
390         struct ref *rm;
391         char *url, *filename = dry_run ? "/dev/null" : git_path("FETCH_HEAD");
392         int want_merge;
393
394         fp = fopen(filename, "a");
395         if (!fp)
396                 return error(_("cannot open %s: %s\n"), filename, strerror(errno));
397
398         if (raw_url)
399                 url = transport_anonymize_url(raw_url);
400         else
401                 url = xstrdup("foreign");
402
403         rm = ref_map;
404         if (check_everything_connected(iterate_ref_map, 0, &rm)) {
405                 rc = error(_("%s did not send all necessary objects\n"), url);
406                 goto abort;
407         }
408
409         /*
410          * The first pass writes objects to be merged and then the
411          * second pass writes the rest, in order to allow using
412          * FETCH_HEAD as a refname to refer to the ref to be merged.
413          */
414         for (want_merge = 1; 0 <= want_merge; want_merge--) {
415                 for (rm = ref_map; rm; rm = rm->next) {
416                         struct ref *ref = NULL;
417
418                         commit = lookup_commit_reference_gently(rm->old_sha1, 1);
419                         if (!commit)
420                                 rm->merge = 0;
421
422                         if (rm->merge != want_merge)
423                                 continue;
424
425                         if (rm->peer_ref) {
426                                 ref = xcalloc(1, sizeof(*ref) + strlen(rm->peer_ref->name) + 1);
427                                 strcpy(ref->name, rm->peer_ref->name);
428                                 hashcpy(ref->old_sha1, rm->peer_ref->old_sha1);
429                                 hashcpy(ref->new_sha1, rm->old_sha1);
430                                 ref->force = rm->peer_ref->force;
431                         }
432
433
434                         if (!strcmp(rm->name, "HEAD")) {
435                                 kind = "";
436                                 what = "";
437                         }
438                         else if (!prefixcmp(rm->name, "refs/heads/")) {
439                                 kind = "branch";
440                                 what = rm->name + 11;
441                         }
442                         else if (!prefixcmp(rm->name, "refs/tags/")) {
443                                 kind = "tag";
444                                 what = rm->name + 10;
445                         }
446                         else if (!prefixcmp(rm->name, "refs/remotes/")) {
447                                 kind = "remote-tracking branch";
448                                 what = rm->name + 13;
449                         }
450                         else {
451                                 kind = "";
452                                 what = rm->name;
453                         }
454
455                         url_len = strlen(url);
456                         for (i = url_len - 1; url[i] == '/' && 0 <= i; i--)
457                                 ;
458                         url_len = i + 1;
459                         if (4 < i && !strncmp(".git", url + i - 3, 4))
460                                 url_len = i - 3;
461
462                         strbuf_reset(&note);
463                         if (*what) {
464                                 if (*kind)
465                                         strbuf_addf(&note, "%s ", kind);
466                                 strbuf_addf(&note, "'%s' of ", what);
467                         }
468                         fprintf(fp, "%s\t%s\t%s",
469                                 sha1_to_hex(rm->old_sha1),
470                                 rm->merge ? "" : "not-for-merge",
471                                 note.buf);
472                         for (i = 0; i < url_len; ++i)
473                                 if ('\n' == url[i])
474                                         fputs("\\n", fp);
475                                 else
476                                         fputc(url[i], fp);
477                         fputc('\n', fp);
478
479                         strbuf_reset(&note);
480                         if (ref) {
481                                 rc |= update_local_ref(ref, what, rm, &note);
482                                 free(ref);
483                         } else
484                                 strbuf_addf(&note, "* %-*s %-*s -> FETCH_HEAD",
485                                             TRANSPORT_SUMMARY_WIDTH,
486                                             *kind ? kind : "branch",
487                                             REFCOL_WIDTH,
488                                             *what ? what : "HEAD");
489                         if (note.len) {
490                                 if (verbosity >= 0 && !shown_url) {
491                                         fprintf(stderr, _("From %.*s\n"),
492                                                         url_len, url);
493                                         shown_url = 1;
494                                 }
495                                 if (verbosity >= 0)
496                                         fprintf(stderr, " %s\n", note.buf);
497                         }
498                 }
499         }
500
501         if (rc & STORE_REF_ERROR_DF_CONFLICT)
502                 error(_("some local refs could not be updated; try running\n"
503                       " 'git remote prune %s' to remove any old, conflicting "
504                       "branches"), remote_name);
505
506  abort:
507         strbuf_release(&note);
508         free(url);
509         fclose(fp);
510         return rc;
511 }
512
513 /*
514  * We would want to bypass the object transfer altogether if
515  * everything we are going to fetch already exists and is connected
516  * locally.
517  */
518 static int quickfetch(struct ref *ref_map)
519 {
520         struct ref *rm = ref_map;
521
522         /*
523          * If we are deepening a shallow clone we already have these
524          * objects reachable.  Running rev-list here will return with
525          * a good (0) exit status and we'll bypass the fetch that we
526          * really need to perform.  Claiming failure now will ensure
527          * we perform the network exchange to deepen our history.
528          */
529         if (depth)
530                 return -1;
531         return check_everything_connected(iterate_ref_map, 1, &rm);
532 }
533
534 static int fetch_refs(struct transport *transport, struct ref *ref_map)
535 {
536         int ret = quickfetch(ref_map);
537         if (ret)
538                 ret = transport_fetch_refs(transport, ref_map);
539         if (!ret)
540                 ret |= store_updated_refs(transport->url,
541                                 transport->remote->name,
542                                 ref_map);
543         transport_unlock_pack(transport);
544         return ret;
545 }
546
547 static int prune_refs(struct refspec *refs, int ref_count, struct ref *ref_map)
548 {
549         int result = 0;
550         struct ref *ref, *stale_refs = get_stale_heads(refs, ref_count, ref_map);
551         const char *dangling_msg = dry_run
552                 ? _("   (%s will become dangling)")
553                 : _("   (%s has become dangling)");
554
555         for (ref = stale_refs; ref; ref = ref->next) {
556                 if (!dry_run)
557                         result |= delete_ref(ref->name, NULL, 0);
558                 if (verbosity >= 0) {
559                         fprintf(stderr, " x %-*s %-*s -> %s\n",
560                                 TRANSPORT_SUMMARY(_("[deleted]")),
561                                 REFCOL_WIDTH, _("(none)"), prettify_refname(ref->name));
562                         warn_dangling_symref(stderr, dangling_msg, ref->name);
563                 }
564         }
565         free_refs(stale_refs);
566         return result;
567 }
568
569 static int add_existing(const char *refname, const unsigned char *sha1,
570                         int flag, void *cbdata)
571 {
572         struct string_list *list = (struct string_list *)cbdata;
573         struct string_list_item *item = string_list_insert(list, refname);
574         item->util = (void *)sha1;
575         return 0;
576 }
577
578 static int will_fetch(struct ref **head, const unsigned char *sha1)
579 {
580         struct ref *rm = *head;
581         while (rm) {
582                 if (!hashcmp(rm->old_sha1, sha1))
583                         return 1;
584                 rm = rm->next;
585         }
586         return 0;
587 }
588
589 static void find_non_local_tags(struct transport *transport,
590                         struct ref **head,
591                         struct ref ***tail)
592 {
593         struct string_list existing_refs = STRING_LIST_INIT_NODUP;
594         struct string_list remote_refs = STRING_LIST_INIT_NODUP;
595         const struct ref *ref;
596         struct string_list_item *item = NULL;
597
598         for_each_ref(add_existing, &existing_refs);
599         for (ref = transport_get_remote_refs(transport); ref; ref = ref->next) {
600                 if (prefixcmp(ref->name, "refs/tags/"))
601                         continue;
602
603                 /*
604                  * The peeled ref always follows the matching base
605                  * ref, so if we see a peeled ref that we don't want
606                  * to fetch then we can mark the ref entry in the list
607                  * as one to ignore by setting util to NULL.
608                  */
609                 if (!suffixcmp(ref->name, "^{}")) {
610                         if (item && !has_sha1_file(ref->old_sha1) &&
611                             !will_fetch(head, ref->old_sha1) &&
612                             !has_sha1_file(item->util) &&
613                             !will_fetch(head, item->util))
614                                 item->util = NULL;
615                         item = NULL;
616                         continue;
617                 }
618
619                 /*
620                  * If item is non-NULL here, then we previously saw a
621                  * ref not followed by a peeled reference, so we need
622                  * to check if it is a lightweight tag that we want to
623                  * fetch.
624                  */
625                 if (item && !has_sha1_file(item->util) &&
626                     !will_fetch(head, item->util))
627                         item->util = NULL;
628
629                 item = NULL;
630
631                 /* skip duplicates and refs that we already have */
632                 if (string_list_has_string(&remote_refs, ref->name) ||
633                     string_list_has_string(&existing_refs, ref->name))
634                         continue;
635
636                 item = string_list_insert(&remote_refs, ref->name);
637                 item->util = (void *)ref->old_sha1;
638         }
639         string_list_clear(&existing_refs, 0);
640
641         /*
642          * We may have a final lightweight tag that needs to be
643          * checked to see if it needs fetching.
644          */
645         if (item && !has_sha1_file(item->util) &&
646             !will_fetch(head, item->util))
647                 item->util = NULL;
648
649         /*
650          * For all the tags in the remote_refs string list,
651          * add them to the list of refs to be fetched
652          */
653         for_each_string_list_item(item, &remote_refs) {
654                 /* Unless we have already decided to ignore this item... */
655                 if (item->util)
656                 {
657                         struct ref *rm = alloc_ref(item->string);
658                         rm->peer_ref = alloc_ref(item->string);
659                         hashcpy(rm->old_sha1, item->util);
660                         **tail = rm;
661                         *tail = &rm->next;
662                 }
663         }
664
665         string_list_clear(&remote_refs, 0);
666 }
667
668 static void check_not_current_branch(struct ref *ref_map)
669 {
670         struct branch *current_branch = branch_get(NULL);
671
672         if (is_bare_repository() || !current_branch)
673                 return;
674
675         for (; ref_map; ref_map = ref_map->next)
676                 if (ref_map->peer_ref && !strcmp(current_branch->refname,
677                                         ref_map->peer_ref->name))
678                         die(_("Refusing to fetch into current branch %s "
679                             "of non-bare repository"), current_branch->refname);
680 }
681
682 static int truncate_fetch_head(void)
683 {
684         char *filename = git_path("FETCH_HEAD");
685         FILE *fp = fopen(filename, "w");
686
687         if (!fp)
688                 return error(_("cannot open %s: %s\n"), filename, strerror(errno));
689         fclose(fp);
690         return 0;
691 }
692
693 static int do_fetch(struct transport *transport,
694                     struct refspec *refs, int ref_count)
695 {
696         struct string_list existing_refs = STRING_LIST_INIT_NODUP;
697         struct string_list_item *peer_item = NULL;
698         struct ref *ref_map;
699         struct ref *rm;
700         int autotags = (transport->remote->fetch_tags == 1);
701
702         for_each_ref(add_existing, &existing_refs);
703
704         if (tags == TAGS_DEFAULT) {
705                 if (transport->remote->fetch_tags == 2)
706                         tags = TAGS_SET;
707                 if (transport->remote->fetch_tags == -1)
708                         tags = TAGS_UNSET;
709         }
710
711         if (!transport->get_refs_list || !transport->fetch)
712                 die(_("Don't know how to fetch from %s"), transport->url);
713
714         /* if not appending, truncate FETCH_HEAD */
715         if (!append && !dry_run) {
716                 int errcode = truncate_fetch_head();
717                 if (errcode)
718                         return errcode;
719         }
720
721         ref_map = get_ref_map(transport, refs, ref_count, tags, &autotags);
722         if (!update_head_ok)
723                 check_not_current_branch(ref_map);
724
725         for (rm = ref_map; rm; rm = rm->next) {
726                 if (rm->peer_ref) {
727                         peer_item = string_list_lookup(&existing_refs,
728                                                        rm->peer_ref->name);
729                         if (peer_item)
730                                 hashcpy(rm->peer_ref->old_sha1,
731                                         peer_item->util);
732                 }
733         }
734
735         if (tags == TAGS_DEFAULT && autotags)
736                 transport_set_option(transport, TRANS_OPT_FOLLOWTAGS, "1");
737         if (fetch_refs(transport, ref_map)) {
738                 free_refs(ref_map);
739                 return 1;
740         }
741         if (prune) {
742                 /* If --tags was specified, pretend the user gave us the canonical tags refspec */
743                 if (tags == TAGS_SET) {
744                         const char *tags_str = "refs/tags/*:refs/tags/*";
745                         struct refspec *tags_refspec, *refspec;
746
747                         /* Copy the refspec and add the tags to it */
748                         refspec = xcalloc(ref_count + 1, sizeof(struct refspec));
749                         tags_refspec = parse_fetch_refspec(1, &tags_str);
750                         memcpy(refspec, refs, ref_count * sizeof(struct refspec));
751                         memcpy(&refspec[ref_count], tags_refspec, sizeof(struct refspec));
752                         ref_count++;
753
754                         prune_refs(refspec, ref_count, ref_map);
755
756                         ref_count--;
757                         /* The rest of the strings belong to fetch_one */
758                         free_refspec(1, tags_refspec);
759                         free(refspec);
760                 } else if (ref_count) {
761                         prune_refs(refs, ref_count, ref_map);
762                 } else {
763                         prune_refs(transport->remote->fetch, transport->remote->fetch_refspec_nr, ref_map);
764                 }
765         }
766         free_refs(ref_map);
767
768         /* if neither --no-tags nor --tags was specified, do automated tag
769          * following ... */
770         if (tags == TAGS_DEFAULT && autotags) {
771                 struct ref **tail = &ref_map;
772                 ref_map = NULL;
773                 find_non_local_tags(transport, &ref_map, &tail);
774                 if (ref_map) {
775                         transport_set_option(transport, TRANS_OPT_FOLLOWTAGS, NULL);
776                         transport_set_option(transport, TRANS_OPT_DEPTH, "0");
777                         fetch_refs(transport, ref_map);
778                 }
779                 free_refs(ref_map);
780         }
781
782         return 0;
783 }
784
785 static void set_option(const char *name, const char *value)
786 {
787         int r = transport_set_option(transport, name, value);
788         if (r < 0)
789                 die(_("Option \"%s\" value \"%s\" is not valid for %s"),
790                         name, value, transport->url);
791         if (r > 0)
792                 warning(_("Option \"%s\" is ignored for %s\n"),
793                         name, transport->url);
794 }
795
796 static int get_one_remote_for_fetch(struct remote *remote, void *priv)
797 {
798         struct string_list *list = priv;
799         if (!remote->skip_default_update)
800                 string_list_append(list, remote->name);
801         return 0;
802 }
803
804 struct remote_group_data {
805         const char *name;
806         struct string_list *list;
807 };
808
809 static int get_remote_group(const char *key, const char *value, void *priv)
810 {
811         struct remote_group_data *g = priv;
812
813         if (!prefixcmp(key, "remotes.") &&
814                         !strcmp(key + 8, g->name)) {
815                 /* split list by white space */
816                 int space = strcspn(value, " \t\n");
817                 while (*value) {
818                         if (space > 1) {
819                                 string_list_append(g->list,
820                                                    xstrndup(value, space));
821                         }
822                         value += space + (value[space] != '\0');
823                         space = strcspn(value, " \t\n");
824                 }
825         }
826
827         return 0;
828 }
829
830 static int add_remote_or_group(const char *name, struct string_list *list)
831 {
832         int prev_nr = list->nr;
833         struct remote_group_data g;
834         g.name = name; g.list = list;
835
836         git_config(get_remote_group, &g);
837         if (list->nr == prev_nr) {
838                 struct remote *remote;
839                 if (!remote_is_configured(name))
840                         return 0;
841                 remote = remote_get(name);
842                 string_list_append(list, remote->name);
843         }
844         return 1;
845 }
846
847 static void add_options_to_argv(struct argv_array *argv)
848 {
849         if (dry_run)
850                 argv_array_push(argv, "--dry-run");
851         if (prune)
852                 argv_array_push(argv, "--prune");
853         if (update_head_ok)
854                 argv_array_push(argv, "--update-head-ok");
855         if (force)
856                 argv_array_push(argv, "--force");
857         if (keep)
858                 argv_array_push(argv, "--keep");
859         if (recurse_submodules == RECURSE_SUBMODULES_ON)
860                 argv_array_push(argv, "--recurse-submodules");
861         else if (recurse_submodules == RECURSE_SUBMODULES_ON_DEMAND)
862                 argv_array_push(argv, "--recurse-submodules=on-demand");
863         if (tags == TAGS_SET)
864                 argv_array_push(argv, "--tags");
865         else if (tags == TAGS_UNSET)
866                 argv_array_push(argv, "--no-tags");
867         if (verbosity >= 2)
868                 argv_array_push(argv, "-v");
869         if (verbosity >= 1)
870                 argv_array_push(argv, "-v");
871         else if (verbosity < 0)
872                 argv_array_push(argv, "-q");
873
874 }
875
876 static int fetch_multiple(struct string_list *list)
877 {
878         int i, result = 0;
879         struct argv_array argv = ARGV_ARRAY_INIT;
880
881         if (!append && !dry_run) {
882                 int errcode = truncate_fetch_head();
883                 if (errcode)
884                         return errcode;
885         }
886
887         argv_array_pushl(&argv, "fetch", "--append", NULL);
888         add_options_to_argv(&argv);
889
890         for (i = 0; i < list->nr; i++) {
891                 const char *name = list->items[i].string;
892                 argv_array_push(&argv, name);
893                 if (verbosity >= 0)
894                         printf(_("Fetching %s\n"), name);
895                 if (run_command_v_opt(argv.argv, RUN_GIT_CMD)) {
896                         error(_("Could not fetch %s"), name);
897                         result = 1;
898                 }
899                 argv_array_pop(&argv);
900         }
901
902         argv_array_clear(&argv);
903         return result;
904 }
905
906 static int fetch_one(struct remote *remote, int argc, const char **argv)
907 {
908         int i;
909         static const char **refs = NULL;
910         struct refspec *refspec;
911         int ref_nr = 0;
912         int exit_code;
913
914         if (!remote)
915                 die(_("No remote repository specified.  Please, specify either a URL or a\n"
916                     "remote name from which new revisions should be fetched."));
917
918         transport = transport_get(remote, NULL);
919         transport_set_verbosity(transport, verbosity, progress);
920         if (upload_pack)
921                 set_option(TRANS_OPT_UPLOADPACK, upload_pack);
922         if (keep)
923                 set_option(TRANS_OPT_KEEP, "yes");
924         if (depth)
925                 set_option(TRANS_OPT_DEPTH, depth);
926
927         if (argc > 0) {
928                 int j = 0;
929                 refs = xcalloc(argc + 1, sizeof(const char *));
930                 for (i = 0; i < argc; i++) {
931                         if (!strcmp(argv[i], "tag")) {
932                                 char *ref;
933                                 i++;
934                                 if (i >= argc)
935                                         die(_("You need to specify a tag name."));
936                                 ref = xmalloc(strlen(argv[i]) * 2 + 22);
937                                 strcpy(ref, "refs/tags/");
938                                 strcat(ref, argv[i]);
939                                 strcat(ref, ":refs/tags/");
940                                 strcat(ref, argv[i]);
941                                 refs[j++] = ref;
942                         } else
943                                 refs[j++] = argv[i];
944                 }
945                 refs[j] = NULL;
946                 ref_nr = j;
947         }
948
949         sigchain_push_common(unlock_pack_on_signal);
950         atexit(unlock_pack);
951         refspec = parse_fetch_refspec(ref_nr, refs);
952         exit_code = do_fetch(transport, refspec, ref_nr);
953         free_refspec(ref_nr, refspec);
954         transport_disconnect(transport);
955         transport = NULL;
956         return exit_code;
957 }
958
959 int cmd_fetch(int argc, const char **argv, const char *prefix)
960 {
961         int i;
962         struct string_list list = STRING_LIST_INIT_NODUP;
963         struct remote *remote;
964         int result = 0;
965         static const char *argv_gc_auto[] = {
966                 "gc", "--auto", NULL,
967         };
968
969         packet_trace_identity("fetch");
970
971         /* Record the command line for the reflog */
972         strbuf_addstr(&default_rla, "fetch");
973         for (i = 1; i < argc; i++)
974                 strbuf_addf(&default_rla, " %s", argv[i]);
975
976         argc = parse_options(argc, argv, prefix,
977                              builtin_fetch_options, builtin_fetch_usage, 0);
978
979         if (unshallow) {
980                 if (depth)
981                         die(_("--depth and --unshallow cannot be used together"));
982                 else if (!is_repository_shallow())
983                         die(_("--unshallow on a complete repository does not make sense"));
984                 else {
985                         static char inf_depth[12];
986                         sprintf(inf_depth, "%d", INFINITE_DEPTH);
987                         depth = inf_depth;
988                 }
989         }
990
991         if (recurse_submodules != RECURSE_SUBMODULES_OFF) {
992                 if (recurse_submodules_default) {
993                         int arg = parse_fetch_recurse_submodules_arg("--recurse-submodules-default", recurse_submodules_default);
994                         set_config_fetch_recurse_submodules(arg);
995                 }
996                 gitmodules_config();
997                 git_config(submodule_config, NULL);
998         }
999
1000         if (all) {
1001                 if (argc == 1)
1002                         die(_("fetch --all does not take a repository argument"));
1003                 else if (argc > 1)
1004                         die(_("fetch --all does not make sense with refspecs"));
1005                 (void) for_each_remote(get_one_remote_for_fetch, &list);
1006                 result = fetch_multiple(&list);
1007         } else if (argc == 0) {
1008                 /* No arguments -- use default remote */
1009                 remote = remote_get(NULL);
1010                 result = fetch_one(remote, argc, argv);
1011         } else if (multiple) {
1012                 /* All arguments are assumed to be remotes or groups */
1013                 for (i = 0; i < argc; i++)
1014                         if (!add_remote_or_group(argv[i], &list))
1015                                 die(_("No such remote or remote group: %s"), argv[i]);
1016                 result = fetch_multiple(&list);
1017         } else {
1018                 /* Single remote or group */
1019                 (void) add_remote_or_group(argv[0], &list);
1020                 if (list.nr > 1) {
1021                         /* More than one remote */
1022                         if (argc > 1)
1023                                 die(_("Fetching a group and specifying refspecs does not make sense"));
1024                         result = fetch_multiple(&list);
1025                 } else {
1026                         /* Zero or one remotes */
1027                         remote = remote_get(argv[0]);
1028                         result = fetch_one(remote, argc-1, argv+1);
1029                 }
1030         }
1031
1032         if (!result && (recurse_submodules != RECURSE_SUBMODULES_OFF)) {
1033                 struct argv_array options = ARGV_ARRAY_INIT;
1034
1035                 add_options_to_argv(&options);
1036                 result = fetch_populated_submodules(&options,
1037                                                     submodule_prefix,
1038                                                     recurse_submodules,
1039                                                     verbosity < 0);
1040                 argv_array_clear(&options);
1041         }
1042
1043         /* All names were strdup()ed or strndup()ed */
1044         list.strdup_strings = 1;
1045         string_list_clear(&list, 0);
1046
1047         run_command_v_opt(argv_gc_auto, RUN_GIT_CMD);
1048
1049         return result;
1050 }