Merge branch 'as/docfix-reflog-expire-unreachable'
[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 "submodule.h"
15 #include "connected.h"
16 #include "argv-array.h"
17
18 static const char * const builtin_fetch_usage[] = {
19         N_("git fetch [<options>] [<repository> [<refspec>...]]"),
20         N_("git fetch [<options>] <group>"),
21         N_("git fetch --multiple [<options>] [(<repository> | <group>)...]"),
22         N_("git fetch --all [<options>]"),
23         NULL
24 };
25
26 enum {
27         TAGS_UNSET = 0,
28         TAGS_DEFAULT = 1,
29         TAGS_SET = 2
30 };
31
32 static int fetch_prune_config = -1; /* unspecified */
33 static int prune = -1; /* unspecified */
34 #define PRUNE_BY_DEFAULT 0 /* do we prune by default? */
35
36 static int all, append, dry_run, force, keep, multiple, update_head_ok, verbosity;
37 static int progress = -1, recurse_submodules = RECURSE_SUBMODULES_DEFAULT;
38 static int tags = TAGS_DEFAULT, unshallow, update_shallow;
39 static const char *depth;
40 static const char *upload_pack;
41 static struct strbuf default_rla = STRBUF_INIT;
42 static struct transport *gtransport;
43 static struct transport *gsecondary;
44 static const char *submodule_prefix = "";
45 static const char *recurse_submodules_default;
46 static int shown_url = 0;
47 static int refmap_alloc, refmap_nr;
48 static const char **refmap_array;
49
50 static int option_parse_recurse_submodules(const struct option *opt,
51                                    const char *arg, int unset)
52 {
53         if (unset) {
54                 recurse_submodules = RECURSE_SUBMODULES_OFF;
55         } else {
56                 if (arg)
57                         recurse_submodules = parse_fetch_recurse_submodules_arg(opt->long_name, arg);
58                 else
59                         recurse_submodules = RECURSE_SUBMODULES_ON;
60         }
61         return 0;
62 }
63
64 static int git_fetch_config(const char *k, const char *v, void *cb)
65 {
66         if (!strcmp(k, "fetch.prune")) {
67                 fetch_prune_config = git_config_bool(k, v);
68                 return 0;
69         }
70         return git_default_config(k, v, cb);
71 }
72
73 static int parse_refmap_arg(const struct option *opt, const char *arg, int unset)
74 {
75         ALLOC_GROW(refmap_array, refmap_nr + 1, refmap_alloc);
76
77         /*
78          * "git fetch --refmap='' origin foo"
79          * can be used to tell the command not to store anywhere
80          */
81         if (*arg)
82                 refmap_array[refmap_nr++] = arg;
83         return 0;
84 }
85
86 static struct option builtin_fetch_options[] = {
87         OPT__VERBOSITY(&verbosity),
88         OPT_BOOL(0, "all", &all,
89                  N_("fetch from all remotes")),
90         OPT_BOOL('a', "append", &append,
91                  N_("append to .git/FETCH_HEAD instead of overwriting")),
92         OPT_STRING(0, "upload-pack", &upload_pack, N_("path"),
93                    N_("path to upload pack on remote end")),
94         OPT__FORCE(&force, N_("force overwrite of local branch")),
95         OPT_BOOL('m', "multiple", &multiple,
96                  N_("fetch from multiple remotes")),
97         OPT_SET_INT('t', "tags", &tags,
98                     N_("fetch all tags and associated objects"), TAGS_SET),
99         OPT_SET_INT('n', NULL, &tags,
100                     N_("do not fetch all tags (--no-tags)"), TAGS_UNSET),
101         OPT_BOOL('p', "prune", &prune,
102                  N_("prune remote-tracking branches no longer on remote")),
103         { OPTION_CALLBACK, 0, "recurse-submodules", NULL, N_("on-demand"),
104                     N_("control recursive fetching of submodules"),
105                     PARSE_OPT_OPTARG, option_parse_recurse_submodules },
106         OPT_BOOL(0, "dry-run", &dry_run,
107                  N_("dry run")),
108         OPT_BOOL('k', "keep", &keep, N_("keep downloaded pack")),
109         OPT_BOOL('u', "update-head-ok", &update_head_ok,
110                     N_("allow updating of HEAD ref")),
111         OPT_BOOL(0, "progress", &progress, N_("force progress reporting")),
112         OPT_STRING(0, "depth", &depth, N_("depth"),
113                    N_("deepen history of shallow clone")),
114         { OPTION_SET_INT, 0, "unshallow", &unshallow, NULL,
115                    N_("convert to a complete repository"),
116                    PARSE_OPT_NONEG | PARSE_OPT_NOARG, NULL, 1 },
117         { OPTION_STRING, 0, "submodule-prefix", &submodule_prefix, N_("dir"),
118                    N_("prepend this to submodule path output"), PARSE_OPT_HIDDEN },
119         { OPTION_STRING, 0, "recurse-submodules-default",
120                    &recurse_submodules_default, NULL,
121                    N_("default mode for recursion"), PARSE_OPT_HIDDEN },
122         OPT_BOOL(0, "update-shallow", &update_shallow,
123                  N_("accept refs that update .git/shallow")),
124         { OPTION_CALLBACK, 0, "refmap", NULL, N_("refmap"),
125           N_("specify fetch refmap"), PARSE_OPT_NONEG, parse_refmap_arg },
126         OPT_END()
127 };
128
129 static void unlock_pack(void)
130 {
131         if (gtransport)
132                 transport_unlock_pack(gtransport);
133         if (gsecondary)
134                 transport_unlock_pack(gsecondary);
135 }
136
137 static void unlock_pack_on_signal(int signo)
138 {
139         unlock_pack();
140         sigchain_pop(signo);
141         raise(signo);
142 }
143
144 static void add_merge_config(struct ref **head,
145                            const struct ref *remote_refs,
146                            struct branch *branch,
147                            struct ref ***tail)
148 {
149         int i;
150
151         for (i = 0; i < branch->merge_nr; i++) {
152                 struct ref *rm, **old_tail = *tail;
153                 struct refspec refspec;
154
155                 for (rm = *head; rm; rm = rm->next) {
156                         if (branch_merge_matches(branch, i, rm->name)) {
157                                 rm->fetch_head_status = FETCH_HEAD_MERGE;
158                                 break;
159                         }
160                 }
161                 if (rm)
162                         continue;
163
164                 /*
165                  * Not fetched to a remote-tracking branch?  We need to fetch
166                  * it anyway to allow this branch's "branch.$name.merge"
167                  * to be honored by 'git pull', but we do not have to
168                  * fail if branch.$name.merge is misconfigured to point
169                  * at a nonexisting branch.  If we were indeed called by
170                  * 'git pull', it will notice the misconfiguration because
171                  * there is no entry in the resulting FETCH_HEAD marked
172                  * for merging.
173                  */
174                 memset(&refspec, 0, sizeof(refspec));
175                 refspec.src = branch->merge[i]->src;
176                 get_fetch_map(remote_refs, &refspec, tail, 1);
177                 for (rm = *old_tail; rm; rm = rm->next)
178                         rm->fetch_head_status = FETCH_HEAD_MERGE;
179         }
180 }
181
182 static int add_existing(const char *refname, const struct object_id *oid,
183                         int flag, void *cbdata)
184 {
185         struct string_list *list = (struct string_list *)cbdata;
186         struct string_list_item *item = string_list_insert(list, refname);
187         struct object_id *old_oid = xmalloc(sizeof(*old_oid));
188
189         oidcpy(old_oid, oid);
190         item->util = old_oid;
191         return 0;
192 }
193
194 static int will_fetch(struct ref **head, const unsigned char *sha1)
195 {
196         struct ref *rm = *head;
197         while (rm) {
198                 if (!hashcmp(rm->old_sha1, sha1))
199                         return 1;
200                 rm = rm->next;
201         }
202         return 0;
203 }
204
205 static void find_non_local_tags(struct transport *transport,
206                         struct ref **head,
207                         struct ref ***tail)
208 {
209         struct string_list existing_refs = STRING_LIST_INIT_DUP;
210         struct string_list remote_refs = STRING_LIST_INIT_NODUP;
211         const struct ref *ref;
212         struct string_list_item *item = NULL;
213
214         for_each_ref(add_existing, &existing_refs);
215         for (ref = transport_get_remote_refs(transport); ref; ref = ref->next) {
216                 if (!starts_with(ref->name, "refs/tags/"))
217                         continue;
218
219                 /*
220                  * The peeled ref always follows the matching base
221                  * ref, so if we see a peeled ref that we don't want
222                  * to fetch then we can mark the ref entry in the list
223                  * as one to ignore by setting util to NULL.
224                  */
225                 if (ends_with(ref->name, "^{}")) {
226                         if (item && !has_sha1_file(ref->old_sha1) &&
227                             !will_fetch(head, ref->old_sha1) &&
228                             !has_sha1_file(item->util) &&
229                             !will_fetch(head, item->util))
230                                 item->util = NULL;
231                         item = NULL;
232                         continue;
233                 }
234
235                 /*
236                  * If item is non-NULL here, then we previously saw a
237                  * ref not followed by a peeled reference, so we need
238                  * to check if it is a lightweight tag that we want to
239                  * fetch.
240                  */
241                 if (item && !has_sha1_file(item->util) &&
242                     !will_fetch(head, item->util))
243                         item->util = NULL;
244
245                 item = NULL;
246
247                 /* skip duplicates and refs that we already have */
248                 if (string_list_has_string(&remote_refs, ref->name) ||
249                     string_list_has_string(&existing_refs, ref->name))
250                         continue;
251
252                 item = string_list_insert(&remote_refs, ref->name);
253                 item->util = (void *)ref->old_sha1;
254         }
255         string_list_clear(&existing_refs, 1);
256
257         /*
258          * We may have a final lightweight tag that needs to be
259          * checked to see if it needs fetching.
260          */
261         if (item && !has_sha1_file(item->util) &&
262             !will_fetch(head, item->util))
263                 item->util = NULL;
264
265         /*
266          * For all the tags in the remote_refs string list,
267          * add them to the list of refs to be fetched
268          */
269         for_each_string_list_item(item, &remote_refs) {
270                 /* Unless we have already decided to ignore this item... */
271                 if (item->util)
272                 {
273                         struct ref *rm = alloc_ref(item->string);
274                         rm->peer_ref = alloc_ref(item->string);
275                         hashcpy(rm->old_sha1, item->util);
276                         **tail = rm;
277                         *tail = &rm->next;
278                 }
279         }
280
281         string_list_clear(&remote_refs, 0);
282 }
283
284 static struct ref *get_ref_map(struct transport *transport,
285                                struct refspec *refspecs, int refspec_count,
286                                int tags, int *autotags)
287 {
288         int i;
289         struct ref *rm;
290         struct ref *ref_map = NULL;
291         struct ref **tail = &ref_map;
292
293         /* opportunistically-updated references: */
294         struct ref *orefs = NULL, **oref_tail = &orefs;
295
296         const struct ref *remote_refs = transport_get_remote_refs(transport);
297
298         if (refspec_count) {
299                 struct refspec *fetch_refspec;
300                 int fetch_refspec_nr;
301
302                 for (i = 0; i < refspec_count; i++) {
303                         get_fetch_map(remote_refs, &refspecs[i], &tail, 0);
304                         if (refspecs[i].dst && refspecs[i].dst[0])
305                                 *autotags = 1;
306                 }
307                 /* Merge everything on the command line (but not --tags) */
308                 for (rm = ref_map; rm; rm = rm->next)
309                         rm->fetch_head_status = FETCH_HEAD_MERGE;
310
311                 /*
312                  * For any refs that we happen to be fetching via
313                  * command-line arguments, the destination ref might
314                  * have been missing or have been different than the
315                  * remote-tracking ref that would be derived from the
316                  * configured refspec.  In these cases, we want to
317                  * take the opportunity to update their configured
318                  * remote-tracking reference.  However, we do not want
319                  * to mention these entries in FETCH_HEAD at all, as
320                  * they would simply be duplicates of existing
321                  * entries, so we set them FETCH_HEAD_IGNORE below.
322                  *
323                  * We compute these entries now, based only on the
324                  * refspecs specified on the command line.  But we add
325                  * them to the list following the refspecs resulting
326                  * from the tags option so that one of the latter,
327                  * which has FETCH_HEAD_NOT_FOR_MERGE, is not removed
328                  * by ref_remove_duplicates() in favor of one of these
329                  * opportunistic entries with FETCH_HEAD_IGNORE.
330                  */
331                 if (refmap_array) {
332                         fetch_refspec = parse_fetch_refspec(refmap_nr, refmap_array);
333                         fetch_refspec_nr = refmap_nr;
334                 } else {
335                         fetch_refspec = transport->remote->fetch;
336                         fetch_refspec_nr = transport->remote->fetch_refspec_nr;
337                 }
338
339                 for (i = 0; i < fetch_refspec_nr; i++)
340                         get_fetch_map(ref_map, &fetch_refspec[i], &oref_tail, 1);
341
342                 if (tags == TAGS_SET)
343                         get_fetch_map(remote_refs, tag_refspec, &tail, 0);
344         } else if (refmap_array) {
345                 die("--refmap option is only meaningful with command-line refspec(s).");
346         } else {
347                 /* Use the defaults */
348                 struct remote *remote = transport->remote;
349                 struct branch *branch = branch_get(NULL);
350                 int has_merge = branch_has_merge_config(branch);
351                 if (remote &&
352                     (remote->fetch_refspec_nr ||
353                      /* Note: has_merge implies non-NULL branch->remote_name */
354                      (has_merge && !strcmp(branch->remote_name, remote->name)))) {
355                         for (i = 0; i < remote->fetch_refspec_nr; i++) {
356                                 get_fetch_map(remote_refs, &remote->fetch[i], &tail, 0);
357                                 if (remote->fetch[i].dst &&
358                                     remote->fetch[i].dst[0])
359                                         *autotags = 1;
360                                 if (!i && !has_merge && ref_map &&
361                                     !remote->fetch[0].pattern)
362                                         ref_map->fetch_head_status = FETCH_HEAD_MERGE;
363                         }
364                         /*
365                          * if the remote we're fetching from is the same
366                          * as given in branch.<name>.remote, we add the
367                          * ref given in branch.<name>.merge, too.
368                          *
369                          * Note: has_merge implies non-NULL branch->remote_name
370                          */
371                         if (has_merge &&
372                             !strcmp(branch->remote_name, remote->name))
373                                 add_merge_config(&ref_map, remote_refs, branch, &tail);
374                 } else {
375                         ref_map = get_remote_ref(remote_refs, "HEAD");
376                         if (!ref_map)
377                                 die(_("Couldn't find remote ref HEAD"));
378                         ref_map->fetch_head_status = FETCH_HEAD_MERGE;
379                         tail = &ref_map->next;
380                 }
381         }
382
383         if (tags == TAGS_SET)
384                 /* also fetch all tags */
385                 get_fetch_map(remote_refs, tag_refspec, &tail, 0);
386         else if (tags == TAGS_DEFAULT && *autotags)
387                 find_non_local_tags(transport, &ref_map, &tail);
388
389         /* Now append any refs to be updated opportunistically: */
390         *tail = orefs;
391         for (rm = orefs; rm; rm = rm->next) {
392                 rm->fetch_head_status = FETCH_HEAD_IGNORE;
393                 tail = &rm->next;
394         }
395
396         return ref_remove_duplicates(ref_map);
397 }
398
399 #define STORE_REF_ERROR_OTHER 1
400 #define STORE_REF_ERROR_DF_CONFLICT 2
401
402 static int s_update_ref(const char *action,
403                         struct ref *ref,
404                         int check_old)
405 {
406         char msg[1024];
407         char *rla = getenv("GIT_REFLOG_ACTION");
408         struct ref_transaction *transaction;
409         struct strbuf err = STRBUF_INIT;
410         int ret, df_conflict = 0;
411
412         if (dry_run)
413                 return 0;
414         if (!rla)
415                 rla = default_rla.buf;
416         snprintf(msg, sizeof(msg), "%s: %s", rla, action);
417
418         transaction = ref_transaction_begin(&err);
419         if (!transaction ||
420             ref_transaction_update(transaction, ref->name,
421                                    ref->new_sha1,
422                                    check_old ? ref->old_sha1 : NULL,
423                                    0, msg, &err))
424                 goto fail;
425
426         ret = ref_transaction_commit(transaction, &err);
427         if (ret) {
428                 df_conflict = (ret == TRANSACTION_NAME_CONFLICT);
429                 goto fail;
430         }
431
432         ref_transaction_free(transaction);
433         strbuf_release(&err);
434         return 0;
435 fail:
436         ref_transaction_free(transaction);
437         error("%s", err.buf);
438         strbuf_release(&err);
439         return df_conflict ? STORE_REF_ERROR_DF_CONFLICT
440                            : STORE_REF_ERROR_OTHER;
441 }
442
443 #define REFCOL_WIDTH  10
444
445 static int update_local_ref(struct ref *ref,
446                             const char *remote,
447                             const struct ref *remote_ref,
448                             struct strbuf *display)
449 {
450         struct commit *current = NULL, *updated;
451         enum object_type type;
452         struct branch *current_branch = branch_get(NULL);
453         const char *pretty_ref = prettify_refname(ref->name);
454
455         type = sha1_object_info(ref->new_sha1, NULL);
456         if (type < 0)
457                 die(_("object %s not found"), sha1_to_hex(ref->new_sha1));
458
459         if (!hashcmp(ref->old_sha1, ref->new_sha1)) {
460                 if (verbosity > 0)
461                         strbuf_addf(display, "= %-*s %-*s -> %s",
462                                     TRANSPORT_SUMMARY(_("[up to date]")),
463                                     REFCOL_WIDTH, remote, pretty_ref);
464                 return 0;
465         }
466
467         if (current_branch &&
468             !strcmp(ref->name, current_branch->name) &&
469             !(update_head_ok || is_bare_repository()) &&
470             !is_null_sha1(ref->old_sha1)) {
471                 /*
472                  * If this is the head, and it's not okay to update
473                  * the head, and the old value of the head isn't empty...
474                  */
475                 strbuf_addf(display,
476                             _("! %-*s %-*s -> %s  (can't fetch in current branch)"),
477                             TRANSPORT_SUMMARY(_("[rejected]")),
478                             REFCOL_WIDTH, remote, pretty_ref);
479                 return 1;
480         }
481
482         if (!is_null_sha1(ref->old_sha1) &&
483             starts_with(ref->name, "refs/tags/")) {
484                 int r;
485                 r = s_update_ref("updating tag", ref, 0);
486                 strbuf_addf(display, "%c %-*s %-*s -> %s%s",
487                             r ? '!' : '-',
488                             TRANSPORT_SUMMARY(_("[tag update]")),
489                             REFCOL_WIDTH, remote, pretty_ref,
490                             r ? _("  (unable to update local ref)") : "");
491                 return r;
492         }
493
494         current = lookup_commit_reference_gently(ref->old_sha1, 1);
495         updated = lookup_commit_reference_gently(ref->new_sha1, 1);
496         if (!current || !updated) {
497                 const char *msg;
498                 const char *what;
499                 int r;
500                 /*
501                  * Nicely describe the new ref we're fetching.
502                  * Base this on the remote's ref name, as it's
503                  * more likely to follow a standard layout.
504                  */
505                 const char *name = remote_ref ? remote_ref->name : "";
506                 if (starts_with(name, "refs/tags/")) {
507                         msg = "storing tag";
508                         what = _("[new tag]");
509                 } else if (starts_with(name, "refs/heads/")) {
510                         msg = "storing head";
511                         what = _("[new branch]");
512                 } else {
513                         msg = "storing ref";
514                         what = _("[new ref]");
515                 }
516
517                 if ((recurse_submodules != RECURSE_SUBMODULES_OFF) &&
518                     (recurse_submodules != RECURSE_SUBMODULES_ON))
519                         check_for_new_submodule_commits(ref->new_sha1);
520                 r = s_update_ref(msg, ref, 0);
521                 strbuf_addf(display, "%c %-*s %-*s -> %s%s",
522                             r ? '!' : '*',
523                             TRANSPORT_SUMMARY(what),
524                             REFCOL_WIDTH, remote, pretty_ref,
525                             r ? _("  (unable to update local ref)") : "");
526                 return r;
527         }
528
529         if (in_merge_bases(current, updated)) {
530                 char quickref[83];
531                 int r;
532                 strcpy(quickref, find_unique_abbrev(current->object.sha1, DEFAULT_ABBREV));
533                 strcat(quickref, "..");
534                 strcat(quickref, find_unique_abbrev(ref->new_sha1, DEFAULT_ABBREV));
535                 if ((recurse_submodules != RECURSE_SUBMODULES_OFF) &&
536                     (recurse_submodules != RECURSE_SUBMODULES_ON))
537                         check_for_new_submodule_commits(ref->new_sha1);
538                 r = s_update_ref("fast-forward", ref, 1);
539                 strbuf_addf(display, "%c %-*s %-*s -> %s%s",
540                             r ? '!' : ' ',
541                             TRANSPORT_SUMMARY_WIDTH, quickref,
542                             REFCOL_WIDTH, remote, pretty_ref,
543                             r ? _("  (unable to update local ref)") : "");
544                 return r;
545         } else if (force || ref->force) {
546                 char quickref[84];
547                 int r;
548                 strcpy(quickref, find_unique_abbrev(current->object.sha1, DEFAULT_ABBREV));
549                 strcat(quickref, "...");
550                 strcat(quickref, find_unique_abbrev(ref->new_sha1, DEFAULT_ABBREV));
551                 if ((recurse_submodules != RECURSE_SUBMODULES_OFF) &&
552                     (recurse_submodules != RECURSE_SUBMODULES_ON))
553                         check_for_new_submodule_commits(ref->new_sha1);
554                 r = s_update_ref("forced-update", ref, 1);
555                 strbuf_addf(display, "%c %-*s %-*s -> %s  (%s)",
556                             r ? '!' : '+',
557                             TRANSPORT_SUMMARY_WIDTH, quickref,
558                             REFCOL_WIDTH, remote, pretty_ref,
559                             r ? _("unable to update local ref") : _("forced update"));
560                 return r;
561         } else {
562                 strbuf_addf(display, "! %-*s %-*s -> %s  %s",
563                             TRANSPORT_SUMMARY(_("[rejected]")),
564                             REFCOL_WIDTH, remote, pretty_ref,
565                             _("(non-fast-forward)"));
566                 return 1;
567         }
568 }
569
570 static int iterate_ref_map(void *cb_data, unsigned char sha1[20])
571 {
572         struct ref **rm = cb_data;
573         struct ref *ref = *rm;
574
575         while (ref && ref->status == REF_STATUS_REJECT_SHALLOW)
576                 ref = ref->next;
577         if (!ref)
578                 return -1; /* end of the list */
579         *rm = ref->next;
580         hashcpy(sha1, ref->old_sha1);
581         return 0;
582 }
583
584 static int store_updated_refs(const char *raw_url, const char *remote_name,
585                 struct ref *ref_map)
586 {
587         FILE *fp;
588         struct commit *commit;
589         int url_len, i, rc = 0;
590         struct strbuf note = STRBUF_INIT;
591         const char *what, *kind;
592         struct ref *rm;
593         char *url;
594         const char *filename = dry_run ? "/dev/null" : git_path_fetch_head();
595         int want_status;
596
597         fp = fopen(filename, "a");
598         if (!fp)
599                 return error(_("cannot open %s: %s\n"), filename, strerror(errno));
600
601         if (raw_url)
602                 url = transport_anonymize_url(raw_url);
603         else
604                 url = xstrdup("foreign");
605
606         rm = ref_map;
607         if (check_everything_connected(iterate_ref_map, 0, &rm)) {
608                 rc = error(_("%s did not send all necessary objects\n"), url);
609                 goto abort;
610         }
611
612         /*
613          * We do a pass for each fetch_head_status type in their enum order, so
614          * merged entries are written before not-for-merge. That lets readers
615          * use FETCH_HEAD as a refname to refer to the ref to be merged.
616          */
617         for (want_status = FETCH_HEAD_MERGE;
618              want_status <= FETCH_HEAD_IGNORE;
619              want_status++) {
620                 for (rm = ref_map; rm; rm = rm->next) {
621                         struct ref *ref = NULL;
622                         const char *merge_status_marker = "";
623
624                         if (rm->status == REF_STATUS_REJECT_SHALLOW) {
625                                 if (want_status == FETCH_HEAD_MERGE)
626                                         warning(_("reject %s because shallow roots are not allowed to be updated"),
627                                                 rm->peer_ref ? rm->peer_ref->name : rm->name);
628                                 continue;
629                         }
630
631                         commit = lookup_commit_reference_gently(rm->old_sha1, 1);
632                         if (!commit)
633                                 rm->fetch_head_status = FETCH_HEAD_NOT_FOR_MERGE;
634
635                         if (rm->fetch_head_status != want_status)
636                                 continue;
637
638                         if (rm->peer_ref) {
639                                 ref = xcalloc(1, sizeof(*ref) + strlen(rm->peer_ref->name) + 1);
640                                 strcpy(ref->name, rm->peer_ref->name);
641                                 hashcpy(ref->old_sha1, rm->peer_ref->old_sha1);
642                                 hashcpy(ref->new_sha1, rm->old_sha1);
643                                 ref->force = rm->peer_ref->force;
644                         }
645
646
647                         if (!strcmp(rm->name, "HEAD")) {
648                                 kind = "";
649                                 what = "";
650                         }
651                         else if (starts_with(rm->name, "refs/heads/")) {
652                                 kind = "branch";
653                                 what = rm->name + 11;
654                         }
655                         else if (starts_with(rm->name, "refs/tags/")) {
656                                 kind = "tag";
657                                 what = rm->name + 10;
658                         }
659                         else if (starts_with(rm->name, "refs/remotes/")) {
660                                 kind = "remote-tracking branch";
661                                 what = rm->name + 13;
662                         }
663                         else {
664                                 kind = "";
665                                 what = rm->name;
666                         }
667
668                         url_len = strlen(url);
669                         for (i = url_len - 1; url[i] == '/' && 0 <= i; i--)
670                                 ;
671                         url_len = i + 1;
672                         if (4 < i && !strncmp(".git", url + i - 3, 4))
673                                 url_len = i - 3;
674
675                         strbuf_reset(&note);
676                         if (*what) {
677                                 if (*kind)
678                                         strbuf_addf(&note, "%s ", kind);
679                                 strbuf_addf(&note, "'%s' of ", what);
680                         }
681                         switch (rm->fetch_head_status) {
682                         case FETCH_HEAD_NOT_FOR_MERGE:
683                                 merge_status_marker = "not-for-merge";
684                                 /* fall-through */
685                         case FETCH_HEAD_MERGE:
686                                 fprintf(fp, "%s\t%s\t%s",
687                                         sha1_to_hex(rm->old_sha1),
688                                         merge_status_marker,
689                                         note.buf);
690                                 for (i = 0; i < url_len; ++i)
691                                         if ('\n' == url[i])
692                                                 fputs("\\n", fp);
693                                         else
694                                                 fputc(url[i], fp);
695                                 fputc('\n', fp);
696                                 break;
697                         default:
698                                 /* do not write anything to FETCH_HEAD */
699                                 break;
700                         }
701
702                         strbuf_reset(&note);
703                         if (ref) {
704                                 rc |= update_local_ref(ref, what, rm, &note);
705                                 free(ref);
706                         } else
707                                 strbuf_addf(&note, "* %-*s %-*s -> FETCH_HEAD",
708                                             TRANSPORT_SUMMARY_WIDTH,
709                                             *kind ? kind : "branch",
710                                             REFCOL_WIDTH,
711                                             *what ? what : "HEAD");
712                         if (note.len) {
713                                 if (verbosity >= 0 && !shown_url) {
714                                         fprintf(stderr, _("From %.*s\n"),
715                                                         url_len, url);
716                                         shown_url = 1;
717                                 }
718                                 if (verbosity >= 0)
719                                         fprintf(stderr, " %s\n", note.buf);
720                         }
721                 }
722         }
723
724         if (rc & STORE_REF_ERROR_DF_CONFLICT)
725                 error(_("some local refs could not be updated; try running\n"
726                       " 'git remote prune %s' to remove any old, conflicting "
727                       "branches"), remote_name);
728
729  abort:
730         strbuf_release(&note);
731         free(url);
732         fclose(fp);
733         return rc;
734 }
735
736 /*
737  * We would want to bypass the object transfer altogether if
738  * everything we are going to fetch already exists and is connected
739  * locally.
740  */
741 static int quickfetch(struct ref *ref_map)
742 {
743         struct ref *rm = ref_map;
744
745         /*
746          * If we are deepening a shallow clone we already have these
747          * objects reachable.  Running rev-list here will return with
748          * a good (0) exit status and we'll bypass the fetch that we
749          * really need to perform.  Claiming failure now will ensure
750          * we perform the network exchange to deepen our history.
751          */
752         if (depth)
753                 return -1;
754         return check_everything_connected(iterate_ref_map, 1, &rm);
755 }
756
757 static int fetch_refs(struct transport *transport, struct ref *ref_map)
758 {
759         int ret = quickfetch(ref_map);
760         if (ret)
761                 ret = transport_fetch_refs(transport, ref_map);
762         if (!ret)
763                 ret |= store_updated_refs(transport->url,
764                                 transport->remote->name,
765                                 ref_map);
766         transport_unlock_pack(transport);
767         return ret;
768 }
769
770 static int prune_refs(struct refspec *refs, int ref_count, struct ref *ref_map,
771                 const char *raw_url)
772 {
773         int url_len, i, result = 0;
774         struct ref *ref, *stale_refs = get_stale_heads(refs, ref_count, ref_map);
775         char *url;
776         const char *dangling_msg = dry_run
777                 ? _("   (%s will become dangling)")
778                 : _("   (%s has become dangling)");
779
780         if (raw_url)
781                 url = transport_anonymize_url(raw_url);
782         else
783                 url = xstrdup("foreign");
784
785         url_len = strlen(url);
786         for (i = url_len - 1; url[i] == '/' && 0 <= i; i--)
787                 ;
788
789         url_len = i + 1;
790         if (4 < i && !strncmp(".git", url + i - 3, 4))
791                 url_len = i - 3;
792
793         if (!dry_run) {
794                 struct string_list refnames = STRING_LIST_INIT_NODUP;
795
796                 for (ref = stale_refs; ref; ref = ref->next)
797                         string_list_append(&refnames, ref->name);
798
799                 result = delete_refs(&refnames);
800                 string_list_clear(&refnames, 0);
801         }
802
803         if (verbosity >= 0) {
804                 for (ref = stale_refs; ref; ref = ref->next) {
805                         if (!shown_url) {
806                                 fprintf(stderr, _("From %.*s\n"), url_len, url);
807                                 shown_url = 1;
808                         }
809                         fprintf(stderr, " x %-*s %-*s -> %s\n",
810                                 TRANSPORT_SUMMARY(_("[deleted]")),
811                                 REFCOL_WIDTH, _("(none)"), prettify_refname(ref->name));
812                         warn_dangling_symref(stderr, dangling_msg, ref->name);
813                 }
814         }
815
816         free(url);
817         free_refs(stale_refs);
818         return result;
819 }
820
821 static void check_not_current_branch(struct ref *ref_map)
822 {
823         struct branch *current_branch = branch_get(NULL);
824
825         if (is_bare_repository() || !current_branch)
826                 return;
827
828         for (; ref_map; ref_map = ref_map->next)
829                 if (ref_map->peer_ref && !strcmp(current_branch->refname,
830                                         ref_map->peer_ref->name))
831                         die(_("Refusing to fetch into current branch %s "
832                             "of non-bare repository"), current_branch->refname);
833 }
834
835 static int truncate_fetch_head(void)
836 {
837         const char *filename = git_path_fetch_head();
838         FILE *fp = fopen(filename, "w");
839
840         if (!fp)
841                 return error(_("cannot open %s: %s\n"), filename, strerror(errno));
842         fclose(fp);
843         return 0;
844 }
845
846 static void set_option(struct transport *transport, const char *name, const char *value)
847 {
848         int r = transport_set_option(transport, name, value);
849         if (r < 0)
850                 die(_("Option \"%s\" value \"%s\" is not valid for %s"),
851                     name, value, transport->url);
852         if (r > 0)
853                 warning(_("Option \"%s\" is ignored for %s\n"),
854                         name, transport->url);
855 }
856
857 static struct transport *prepare_transport(struct remote *remote)
858 {
859         struct transport *transport;
860         transport = transport_get(remote, NULL);
861         transport_set_verbosity(transport, verbosity, progress);
862         if (upload_pack)
863                 set_option(transport, TRANS_OPT_UPLOADPACK, upload_pack);
864         if (keep)
865                 set_option(transport, TRANS_OPT_KEEP, "yes");
866         if (depth)
867                 set_option(transport, TRANS_OPT_DEPTH, depth);
868         if (update_shallow)
869                 set_option(transport, TRANS_OPT_UPDATE_SHALLOW, "yes");
870         return transport;
871 }
872
873 static void backfill_tags(struct transport *transport, struct ref *ref_map)
874 {
875         if (transport->cannot_reuse) {
876                 gsecondary = prepare_transport(transport->remote);
877                 transport = gsecondary;
878         }
879
880         transport_set_option(transport, TRANS_OPT_FOLLOWTAGS, NULL);
881         transport_set_option(transport, TRANS_OPT_DEPTH, "0");
882         fetch_refs(transport, ref_map);
883
884         if (gsecondary) {
885                 transport_disconnect(gsecondary);
886                 gsecondary = NULL;
887         }
888 }
889
890 static int do_fetch(struct transport *transport,
891                     struct refspec *refs, int ref_count)
892 {
893         struct string_list existing_refs = STRING_LIST_INIT_DUP;
894         struct ref *ref_map;
895         struct ref *rm;
896         int autotags = (transport->remote->fetch_tags == 1);
897         int retcode = 0;
898
899         for_each_ref(add_existing, &existing_refs);
900
901         if (tags == TAGS_DEFAULT) {
902                 if (transport->remote->fetch_tags == 2)
903                         tags = TAGS_SET;
904                 if (transport->remote->fetch_tags == -1)
905                         tags = TAGS_UNSET;
906         }
907
908         if (!transport->get_refs_list || !transport->fetch)
909                 die(_("Don't know how to fetch from %s"), transport->url);
910
911         /* if not appending, truncate FETCH_HEAD */
912         if (!append && !dry_run) {
913                 retcode = truncate_fetch_head();
914                 if (retcode)
915                         goto cleanup;
916         }
917
918         ref_map = get_ref_map(transport, refs, ref_count, tags, &autotags);
919         if (!update_head_ok)
920                 check_not_current_branch(ref_map);
921
922         for (rm = ref_map; rm; rm = rm->next) {
923                 if (rm->peer_ref) {
924                         struct string_list_item *peer_item =
925                                 string_list_lookup(&existing_refs,
926                                                    rm->peer_ref->name);
927                         if (peer_item) {
928                                 struct object_id *old_oid = peer_item->util;
929                                 hashcpy(rm->peer_ref->old_sha1, old_oid->hash);
930                         }
931                 }
932         }
933
934         if (tags == TAGS_DEFAULT && autotags)
935                 transport_set_option(transport, TRANS_OPT_FOLLOWTAGS, "1");
936         if (prune) {
937                 /*
938                  * We only prune based on refspecs specified
939                  * explicitly (via command line or configuration); we
940                  * don't care whether --tags was specified.
941                  */
942                 if (ref_count) {
943                         prune_refs(refs, ref_count, ref_map, transport->url);
944                 } else {
945                         prune_refs(transport->remote->fetch,
946                                    transport->remote->fetch_refspec_nr,
947                                    ref_map,
948                                    transport->url);
949                 }
950         }
951         if (fetch_refs(transport, ref_map)) {
952                 free_refs(ref_map);
953                 retcode = 1;
954                 goto cleanup;
955         }
956         free_refs(ref_map);
957
958         /* if neither --no-tags nor --tags was specified, do automated tag
959          * following ... */
960         if (tags == TAGS_DEFAULT && autotags) {
961                 struct ref **tail = &ref_map;
962                 ref_map = NULL;
963                 find_non_local_tags(transport, &ref_map, &tail);
964                 if (ref_map)
965                         backfill_tags(transport, ref_map);
966                 free_refs(ref_map);
967         }
968
969  cleanup:
970         string_list_clear(&existing_refs, 1);
971         return retcode;
972 }
973
974 static int get_one_remote_for_fetch(struct remote *remote, void *priv)
975 {
976         struct string_list *list = priv;
977         if (!remote->skip_default_update)
978                 string_list_append(list, remote->name);
979         return 0;
980 }
981
982 struct remote_group_data {
983         const char *name;
984         struct string_list *list;
985 };
986
987 static int get_remote_group(const char *key, const char *value, void *priv)
988 {
989         struct remote_group_data *g = priv;
990
991         if (skip_prefix(key, "remotes.", &key) && !strcmp(key, g->name)) {
992                 /* split list by white space */
993                 while (*value) {
994                         size_t wordlen = strcspn(value, " \t\n");
995
996                         if (wordlen >= 1)
997                                 string_list_append(g->list,
998                                                    xstrndup(value, wordlen));
999                         value += wordlen + (value[wordlen] != '\0');
1000                 }
1001         }
1002
1003         return 0;
1004 }
1005
1006 static int add_remote_or_group(const char *name, struct string_list *list)
1007 {
1008         int prev_nr = list->nr;
1009         struct remote_group_data g;
1010         g.name = name; g.list = list;
1011
1012         git_config(get_remote_group, &g);
1013         if (list->nr == prev_nr) {
1014                 struct remote *remote;
1015                 if (!remote_is_configured(name))
1016                         return 0;
1017                 remote = remote_get(name);
1018                 string_list_append(list, remote->name);
1019         }
1020         return 1;
1021 }
1022
1023 static void add_options_to_argv(struct argv_array *argv)
1024 {
1025         if (dry_run)
1026                 argv_array_push(argv, "--dry-run");
1027         if (prune != -1)
1028                 argv_array_push(argv, prune ? "--prune" : "--no-prune");
1029         if (update_head_ok)
1030                 argv_array_push(argv, "--update-head-ok");
1031         if (force)
1032                 argv_array_push(argv, "--force");
1033         if (keep)
1034                 argv_array_push(argv, "--keep");
1035         if (recurse_submodules == RECURSE_SUBMODULES_ON)
1036                 argv_array_push(argv, "--recurse-submodules");
1037         else if (recurse_submodules == RECURSE_SUBMODULES_ON_DEMAND)
1038                 argv_array_push(argv, "--recurse-submodules=on-demand");
1039         if (tags == TAGS_SET)
1040                 argv_array_push(argv, "--tags");
1041         else if (tags == TAGS_UNSET)
1042                 argv_array_push(argv, "--no-tags");
1043         if (verbosity >= 2)
1044                 argv_array_push(argv, "-v");
1045         if (verbosity >= 1)
1046                 argv_array_push(argv, "-v");
1047         else if (verbosity < 0)
1048                 argv_array_push(argv, "-q");
1049
1050 }
1051
1052 static int fetch_multiple(struct string_list *list)
1053 {
1054         int i, result = 0;
1055         struct argv_array argv = ARGV_ARRAY_INIT;
1056
1057         if (!append && !dry_run) {
1058                 int errcode = truncate_fetch_head();
1059                 if (errcode)
1060                         return errcode;
1061         }
1062
1063         argv_array_pushl(&argv, "fetch", "--append", NULL);
1064         add_options_to_argv(&argv);
1065
1066         for (i = 0; i < list->nr; i++) {
1067                 const char *name = list->items[i].string;
1068                 argv_array_push(&argv, name);
1069                 if (verbosity >= 0)
1070                         printf(_("Fetching %s\n"), name);
1071                 if (run_command_v_opt(argv.argv, RUN_GIT_CMD)) {
1072                         error(_("Could not fetch %s"), name);
1073                         result = 1;
1074                 }
1075                 argv_array_pop(&argv);
1076         }
1077
1078         argv_array_clear(&argv);
1079         return result;
1080 }
1081
1082 static int fetch_one(struct remote *remote, int argc, const char **argv)
1083 {
1084         static const char **refs = NULL;
1085         struct refspec *refspec;
1086         int ref_nr = 0;
1087         int exit_code;
1088
1089         if (!remote)
1090                 die(_("No remote repository specified.  Please, specify either a URL or a\n"
1091                     "remote name from which new revisions should be fetched."));
1092
1093         gtransport = prepare_transport(remote);
1094
1095         if (prune < 0) {
1096                 /* no command line request */
1097                 if (0 <= gtransport->remote->prune)
1098                         prune = gtransport->remote->prune;
1099                 else if (0 <= fetch_prune_config)
1100                         prune = fetch_prune_config;
1101                 else
1102                         prune = PRUNE_BY_DEFAULT;
1103         }
1104
1105         if (argc > 0) {
1106                 int j = 0;
1107                 int i;
1108                 refs = xcalloc(argc + 1, sizeof(const char *));
1109                 for (i = 0; i < argc; i++) {
1110                         if (!strcmp(argv[i], "tag")) {
1111                                 i++;
1112                                 if (i >= argc)
1113                                         die(_("You need to specify a tag name."));
1114                                 refs[j++] = xstrfmt("refs/tags/%s:refs/tags/%s",
1115                                                     argv[i], argv[i]);
1116                         } else
1117                                 refs[j++] = argv[i];
1118                 }
1119                 refs[j] = NULL;
1120                 ref_nr = j;
1121         }
1122
1123         sigchain_push_common(unlock_pack_on_signal);
1124         atexit(unlock_pack);
1125         refspec = parse_fetch_refspec(ref_nr, refs);
1126         exit_code = do_fetch(gtransport, refspec, ref_nr);
1127         free_refspec(ref_nr, refspec);
1128         transport_disconnect(gtransport);
1129         gtransport = NULL;
1130         return exit_code;
1131 }
1132
1133 int cmd_fetch(int argc, const char **argv, const char *prefix)
1134 {
1135         int i;
1136         struct string_list list = STRING_LIST_INIT_NODUP;
1137         struct remote *remote;
1138         int result = 0;
1139         struct argv_array argv_gc_auto = ARGV_ARRAY_INIT;
1140
1141         packet_trace_identity("fetch");
1142
1143         /* Record the command line for the reflog */
1144         strbuf_addstr(&default_rla, "fetch");
1145         for (i = 1; i < argc; i++)
1146                 strbuf_addf(&default_rla, " %s", argv[i]);
1147
1148         git_config(git_fetch_config, NULL);
1149
1150         argc = parse_options(argc, argv, prefix,
1151                              builtin_fetch_options, builtin_fetch_usage, 0);
1152
1153         if (unshallow) {
1154                 if (depth)
1155                         die(_("--depth and --unshallow cannot be used together"));
1156                 else if (!is_repository_shallow())
1157                         die(_("--unshallow on a complete repository does not make sense"));
1158                 else {
1159                         static char inf_depth[12];
1160                         sprintf(inf_depth, "%d", INFINITE_DEPTH);
1161                         depth = inf_depth;
1162                 }
1163         }
1164
1165         /* no need to be strict, transport_set_option() will validate it again */
1166         if (depth && atoi(depth) < 1)
1167                 die(_("depth %s is not a positive number"), depth);
1168
1169         if (recurse_submodules != RECURSE_SUBMODULES_OFF) {
1170                 if (recurse_submodules_default) {
1171                         int arg = parse_fetch_recurse_submodules_arg("--recurse-submodules-default", recurse_submodules_default);
1172                         set_config_fetch_recurse_submodules(arg);
1173                 }
1174                 gitmodules_config();
1175                 git_config(submodule_config, NULL);
1176         }
1177
1178         if (all) {
1179                 if (argc == 1)
1180                         die(_("fetch --all does not take a repository argument"));
1181                 else if (argc > 1)
1182                         die(_("fetch --all does not make sense with refspecs"));
1183                 (void) for_each_remote(get_one_remote_for_fetch, &list);
1184                 result = fetch_multiple(&list);
1185         } else if (argc == 0) {
1186                 /* No arguments -- use default remote */
1187                 remote = remote_get(NULL);
1188                 result = fetch_one(remote, argc, argv);
1189         } else if (multiple) {
1190                 /* All arguments are assumed to be remotes or groups */
1191                 for (i = 0; i < argc; i++)
1192                         if (!add_remote_or_group(argv[i], &list))
1193                                 die(_("No such remote or remote group: %s"), argv[i]);
1194                 result = fetch_multiple(&list);
1195         } else {
1196                 /* Single remote or group */
1197                 (void) add_remote_or_group(argv[0], &list);
1198                 if (list.nr > 1) {
1199                         /* More than one remote */
1200                         if (argc > 1)
1201                                 die(_("Fetching a group and specifying refspecs does not make sense"));
1202                         result = fetch_multiple(&list);
1203                 } else {
1204                         /* Zero or one remotes */
1205                         remote = remote_get(argv[0]);
1206                         result = fetch_one(remote, argc-1, argv+1);
1207                 }
1208         }
1209
1210         if (!result && (recurse_submodules != RECURSE_SUBMODULES_OFF)) {
1211                 struct argv_array options = ARGV_ARRAY_INIT;
1212
1213                 add_options_to_argv(&options);
1214                 result = fetch_populated_submodules(&options,
1215                                                     submodule_prefix,
1216                                                     recurse_submodules,
1217                                                     verbosity < 0);
1218                 argv_array_clear(&options);
1219         }
1220
1221         /* All names were strdup()ed or strndup()ed */
1222         list.strdup_strings = 1;
1223         string_list_clear(&list, 0);
1224
1225         argv_array_pushl(&argv_gc_auto, "gc", "--auto", NULL);
1226         if (verbosity < 0)
1227                 argv_array_push(&argv_gc_auto, "--quiet");
1228         run_command_v_opt(argv_gc_auto.argv, RUN_GIT_CMD);
1229         argv_array_clear(&argv_gc_auto);
1230
1231         return result;
1232 }