http-backend: respect CONTENT_LENGTH for receive-pack
[git] / builtin / fetch.c
1 /*
2  * "git fetch"
3  */
4 #include "cache.h"
5 #include "config.h"
6 #include "repository.h"
7 #include "refs.h"
8 #include "refspec.h"
9 #include "commit.h"
10 #include "builtin.h"
11 #include "string-list.h"
12 #include "remote.h"
13 #include "transport.h"
14 #include "run-command.h"
15 #include "parse-options.h"
16 #include "sigchain.h"
17 #include "submodule-config.h"
18 #include "submodule.h"
19 #include "connected.h"
20 #include "argv-array.h"
21 #include "utf8.h"
22 #include "packfile.h"
23 #include "list-objects-filter-options.h"
24
25 static const char * const builtin_fetch_usage[] = {
26         N_("git fetch [<options>] [<repository> [<refspec>...]]"),
27         N_("git fetch [<options>] <group>"),
28         N_("git fetch --multiple [<options>] [(<repository> | <group>)...]"),
29         N_("git fetch --all [<options>]"),
30         NULL
31 };
32
33 enum {
34         TAGS_UNSET = 0,
35         TAGS_DEFAULT = 1,
36         TAGS_SET = 2
37 };
38
39 static int fetch_prune_config = -1; /* unspecified */
40 static int prune = -1; /* unspecified */
41 #define PRUNE_BY_DEFAULT 0 /* do we prune by default? */
42
43 static int fetch_prune_tags_config = -1; /* unspecified */
44 static int prune_tags = -1; /* unspecified */
45 #define PRUNE_TAGS_BY_DEFAULT 0 /* do we prune tags by default? */
46
47 static int all, append, dry_run, force, keep, multiple, update_head_ok, verbosity, deepen_relative;
48 static int progress = -1;
49 static int tags = TAGS_DEFAULT, unshallow, update_shallow, deepen;
50 static int max_children = 1;
51 static enum transport_family family;
52 static const char *depth;
53 static const char *deepen_since;
54 static const char *upload_pack;
55 static struct string_list deepen_not = STRING_LIST_INIT_NODUP;
56 static struct strbuf default_rla = STRBUF_INIT;
57 static struct transport *gtransport;
58 static struct transport *gsecondary;
59 static const char *submodule_prefix = "";
60 static int recurse_submodules = RECURSE_SUBMODULES_DEFAULT;
61 static int recurse_submodules_default = RECURSE_SUBMODULES_ON_DEMAND;
62 static int shown_url = 0;
63 static struct refspec refmap = REFSPEC_INIT_FETCH;
64 static struct list_objects_filter_options filter_options;
65 static struct string_list server_options = STRING_LIST_INIT_DUP;
66
67 static int git_fetch_config(const char *k, const char *v, void *cb)
68 {
69         if (!strcmp(k, "fetch.prune")) {
70                 fetch_prune_config = git_config_bool(k, v);
71                 return 0;
72         }
73
74         if (!strcmp(k, "fetch.prunetags")) {
75                 fetch_prune_tags_config = git_config_bool(k, v);
76                 return 0;
77         }
78
79         if (!strcmp(k, "submodule.recurse")) {
80                 int r = git_config_bool(k, v) ?
81                         RECURSE_SUBMODULES_ON : RECURSE_SUBMODULES_OFF;
82                 recurse_submodules = r;
83         }
84
85         if (!strcmp(k, "submodule.fetchjobs")) {
86                 max_children = parse_submodule_fetchjobs(k, v);
87                 return 0;
88         } else if (!strcmp(k, "fetch.recursesubmodules")) {
89                 recurse_submodules = parse_fetch_recurse_submodules_arg(k, v);
90                 return 0;
91         }
92
93         return git_default_config(k, v, cb);
94 }
95
96 static int gitmodules_fetch_config(const char *var, const char *value, void *cb)
97 {
98         if (!strcmp(var, "submodule.fetchjobs")) {
99                 max_children = parse_submodule_fetchjobs(var, value);
100                 return 0;
101         } else if (!strcmp(var, "fetch.recursesubmodules")) {
102                 recurse_submodules = parse_fetch_recurse_submodules_arg(var, value);
103                 return 0;
104         }
105
106         return 0;
107 }
108
109 static int parse_refmap_arg(const struct option *opt, const char *arg, int unset)
110 {
111         /*
112          * "git fetch --refmap='' origin foo"
113          * can be used to tell the command not to store anywhere
114          */
115         refspec_append(&refmap, arg);
116
117         return 0;
118 }
119
120 static struct option builtin_fetch_options[] = {
121         OPT__VERBOSITY(&verbosity),
122         OPT_BOOL(0, "all", &all,
123                  N_("fetch from all remotes")),
124         OPT_BOOL('a', "append", &append,
125                  N_("append to .git/FETCH_HEAD instead of overwriting")),
126         OPT_STRING(0, "upload-pack", &upload_pack, N_("path"),
127                    N_("path to upload pack on remote end")),
128         OPT__FORCE(&force, N_("force overwrite of local branch"), 0),
129         OPT_BOOL('m', "multiple", &multiple,
130                  N_("fetch from multiple remotes")),
131         OPT_SET_INT('t', "tags", &tags,
132                     N_("fetch all tags and associated objects"), TAGS_SET),
133         OPT_SET_INT('n', NULL, &tags,
134                     N_("do not fetch all tags (--no-tags)"), TAGS_UNSET),
135         OPT_INTEGER('j', "jobs", &max_children,
136                     N_("number of submodules fetched in parallel")),
137         OPT_BOOL('p', "prune", &prune,
138                  N_("prune remote-tracking branches no longer on remote")),
139         OPT_BOOL('P', "prune-tags", &prune_tags,
140                  N_("prune local tags no longer on remote and clobber changed tags")),
141         { OPTION_CALLBACK, 0, "recurse-submodules", &recurse_submodules, N_("on-demand"),
142                     N_("control recursive fetching of submodules"),
143                     PARSE_OPT_OPTARG, option_fetch_parse_recurse_submodules },
144         OPT_BOOL(0, "dry-run", &dry_run,
145                  N_("dry run")),
146         OPT_BOOL('k', "keep", &keep, N_("keep downloaded pack")),
147         OPT_BOOL('u', "update-head-ok", &update_head_ok,
148                     N_("allow updating of HEAD ref")),
149         OPT_BOOL(0, "progress", &progress, N_("force progress reporting")),
150         OPT_STRING(0, "depth", &depth, N_("depth"),
151                    N_("deepen history of shallow clone")),
152         OPT_STRING(0, "shallow-since", &deepen_since, N_("time"),
153                    N_("deepen history of shallow repository based on time")),
154         OPT_STRING_LIST(0, "shallow-exclude", &deepen_not, N_("revision"),
155                         N_("deepen history of shallow clone, excluding rev")),
156         OPT_INTEGER(0, "deepen", &deepen_relative,
157                     N_("deepen history of shallow clone")),
158         OPT_SET_INT_F(0, "unshallow", &unshallow,
159                       N_("convert to a complete repository"),
160                       1, PARSE_OPT_NONEG),
161         { OPTION_STRING, 0, "submodule-prefix", &submodule_prefix, N_("dir"),
162                    N_("prepend this to submodule path output"), PARSE_OPT_HIDDEN },
163         { OPTION_CALLBACK, 0, "recurse-submodules-default",
164                    &recurse_submodules_default, N_("on-demand"),
165                    N_("default for recursive fetching of submodules "
166                       "(lower priority than config files)"),
167                    PARSE_OPT_HIDDEN, option_fetch_parse_recurse_submodules },
168         OPT_BOOL(0, "update-shallow", &update_shallow,
169                  N_("accept refs that update .git/shallow")),
170         { OPTION_CALLBACK, 0, "refmap", NULL, N_("refmap"),
171           N_("specify fetch refmap"), PARSE_OPT_NONEG, parse_refmap_arg },
172         OPT_STRING_LIST('o', "server-option", &server_options, N_("server-specific"), N_("option to transmit")),
173         OPT_SET_INT('4', "ipv4", &family, N_("use IPv4 addresses only"),
174                         TRANSPORT_FAMILY_IPV4),
175         OPT_SET_INT('6', "ipv6", &family, N_("use IPv6 addresses only"),
176                         TRANSPORT_FAMILY_IPV6),
177         OPT_PARSE_LIST_OBJECTS_FILTER(&filter_options),
178         OPT_END()
179 };
180
181 static void unlock_pack(void)
182 {
183         if (gtransport)
184                 transport_unlock_pack(gtransport);
185         if (gsecondary)
186                 transport_unlock_pack(gsecondary);
187 }
188
189 static void unlock_pack_on_signal(int signo)
190 {
191         unlock_pack();
192         sigchain_pop(signo);
193         raise(signo);
194 }
195
196 static void add_merge_config(struct ref **head,
197                            const struct ref *remote_refs,
198                            struct branch *branch,
199                            struct ref ***tail)
200 {
201         int i;
202
203         for (i = 0; i < branch->merge_nr; i++) {
204                 struct ref *rm, **old_tail = *tail;
205                 struct refspec_item refspec;
206
207                 for (rm = *head; rm; rm = rm->next) {
208                         if (branch_merge_matches(branch, i, rm->name)) {
209                                 rm->fetch_head_status = FETCH_HEAD_MERGE;
210                                 break;
211                         }
212                 }
213                 if (rm)
214                         continue;
215
216                 /*
217                  * Not fetched to a remote-tracking branch?  We need to fetch
218                  * it anyway to allow this branch's "branch.$name.merge"
219                  * to be honored by 'git pull', but we do not have to
220                  * fail if branch.$name.merge is misconfigured to point
221                  * at a nonexisting branch.  If we were indeed called by
222                  * 'git pull', it will notice the misconfiguration because
223                  * there is no entry in the resulting FETCH_HEAD marked
224                  * for merging.
225                  */
226                 memset(&refspec, 0, sizeof(refspec));
227                 refspec.src = branch->merge[i]->src;
228                 get_fetch_map(remote_refs, &refspec, tail, 1);
229                 for (rm = *old_tail; rm; rm = rm->next)
230                         rm->fetch_head_status = FETCH_HEAD_MERGE;
231         }
232 }
233
234 static int add_existing(const char *refname, const struct object_id *oid,
235                         int flag, void *cbdata)
236 {
237         struct string_list *list = (struct string_list *)cbdata;
238         struct string_list_item *item = string_list_insert(list, refname);
239         struct object_id *old_oid = xmalloc(sizeof(*old_oid));
240
241         oidcpy(old_oid, oid);
242         item->util = old_oid;
243         return 0;
244 }
245
246 static int will_fetch(struct ref **head, const unsigned char *sha1)
247 {
248         struct ref *rm = *head;
249         while (rm) {
250                 if (!hashcmp(rm->old_oid.hash, sha1))
251                         return 1;
252                 rm = rm->next;
253         }
254         return 0;
255 }
256
257 static void find_non_local_tags(struct transport *transport,
258                         struct ref **head,
259                         struct ref ***tail)
260 {
261         struct string_list existing_refs = STRING_LIST_INIT_DUP;
262         struct string_list remote_refs = STRING_LIST_INIT_NODUP;
263         const struct ref *ref;
264         struct string_list_item *item = NULL;
265
266         for_each_ref(add_existing, &existing_refs);
267         for (ref = transport_get_remote_refs(transport, NULL); ref; ref = ref->next) {
268                 if (!starts_with(ref->name, "refs/tags/"))
269                         continue;
270
271                 /*
272                  * The peeled ref always follows the matching base
273                  * ref, so if we see a peeled ref that we don't want
274                  * to fetch then we can mark the ref entry in the list
275                  * as one to ignore by setting util to NULL.
276                  */
277                 if (ends_with(ref->name, "^{}")) {
278                         if (item &&
279                             !has_object_file_with_flags(&ref->old_oid,
280                                                         OBJECT_INFO_QUICK) &&
281                             !will_fetch(head, ref->old_oid.hash) &&
282                             !has_sha1_file_with_flags(item->util,
283                                                       OBJECT_INFO_QUICK) &&
284                             !will_fetch(head, item->util))
285                                 item->util = NULL;
286                         item = NULL;
287                         continue;
288                 }
289
290                 /*
291                  * If item is non-NULL here, then we previously saw a
292                  * ref not followed by a peeled reference, so we need
293                  * to check if it is a lightweight tag that we want to
294                  * fetch.
295                  */
296                 if (item &&
297                     !has_sha1_file_with_flags(item->util, OBJECT_INFO_QUICK) &&
298                     !will_fetch(head, item->util))
299                         item->util = NULL;
300
301                 item = NULL;
302
303                 /* skip duplicates and refs that we already have */
304                 if (string_list_has_string(&remote_refs, ref->name) ||
305                     string_list_has_string(&existing_refs, ref->name))
306                         continue;
307
308                 item = string_list_insert(&remote_refs, ref->name);
309                 item->util = (void *)&ref->old_oid;
310         }
311         string_list_clear(&existing_refs, 1);
312
313         /*
314          * We may have a final lightweight tag that needs to be
315          * checked to see if it needs fetching.
316          */
317         if (item &&
318             !has_sha1_file_with_flags(item->util, OBJECT_INFO_QUICK) &&
319             !will_fetch(head, item->util))
320                 item->util = NULL;
321
322         /*
323          * For all the tags in the remote_refs string list,
324          * add them to the list of refs to be fetched
325          */
326         for_each_string_list_item(item, &remote_refs) {
327                 /* Unless we have already decided to ignore this item... */
328                 if (item->util)
329                 {
330                         struct ref *rm = alloc_ref(item->string);
331                         rm->peer_ref = alloc_ref(item->string);
332                         oidcpy(&rm->old_oid, item->util);
333                         **tail = rm;
334                         *tail = &rm->next;
335                 }
336         }
337
338         string_list_clear(&remote_refs, 0);
339 }
340
341 static struct ref *get_ref_map(struct transport *transport,
342                                struct refspec *rs,
343                                int tags, int *autotags)
344 {
345         int i;
346         struct ref *rm;
347         struct ref *ref_map = NULL;
348         struct ref **tail = &ref_map;
349         struct argv_array ref_prefixes = ARGV_ARRAY_INIT;
350
351         /* opportunistically-updated references: */
352         struct ref *orefs = NULL, **oref_tail = &orefs;
353
354         const struct ref *remote_refs;
355
356         if (rs->nr)
357                 refspec_ref_prefixes(rs, &ref_prefixes);
358         else if (transport->remote && transport->remote->fetch.nr)
359                 refspec_ref_prefixes(&transport->remote->fetch, &ref_prefixes);
360
361         if (ref_prefixes.argc &&
362             (tags == TAGS_SET || (tags == TAGS_DEFAULT && !rs->nr))) {
363                 argv_array_push(&ref_prefixes, "refs/tags/");
364         }
365
366         remote_refs = transport_get_remote_refs(transport, &ref_prefixes);
367
368         argv_array_clear(&ref_prefixes);
369
370         if (rs->nr) {
371                 struct refspec *fetch_refspec;
372
373                 for (i = 0; i < rs->nr; i++) {
374                         get_fetch_map(remote_refs, &rs->items[i], &tail, 0);
375                         if (rs->items[i].dst && rs->items[i].dst[0])
376                                 *autotags = 1;
377                 }
378                 /* Merge everything on the command line (but not --tags) */
379                 for (rm = ref_map; rm; rm = rm->next)
380                         rm->fetch_head_status = FETCH_HEAD_MERGE;
381
382                 /*
383                  * For any refs that we happen to be fetching via
384                  * command-line arguments, the destination ref might
385                  * have been missing or have been different than the
386                  * remote-tracking ref that would be derived from the
387                  * configured refspec.  In these cases, we want to
388                  * take the opportunity to update their configured
389                  * remote-tracking reference.  However, we do not want
390                  * to mention these entries in FETCH_HEAD at all, as
391                  * they would simply be duplicates of existing
392                  * entries, so we set them FETCH_HEAD_IGNORE below.
393                  *
394                  * We compute these entries now, based only on the
395                  * refspecs specified on the command line.  But we add
396                  * them to the list following the refspecs resulting
397                  * from the tags option so that one of the latter,
398                  * which has FETCH_HEAD_NOT_FOR_MERGE, is not removed
399                  * by ref_remove_duplicates() in favor of one of these
400                  * opportunistic entries with FETCH_HEAD_IGNORE.
401                  */
402                 if (refmap.nr)
403                         fetch_refspec = &refmap;
404                 else
405                         fetch_refspec = &transport->remote->fetch;
406
407                 for (i = 0; i < fetch_refspec->nr; i++)
408                         get_fetch_map(ref_map, &fetch_refspec->items[i], &oref_tail, 1);
409         } else if (refmap.nr) {
410                 die("--refmap option is only meaningful with command-line refspec(s).");
411         } else {
412                 /* Use the defaults */
413                 struct remote *remote = transport->remote;
414                 struct branch *branch = branch_get(NULL);
415                 int has_merge = branch_has_merge_config(branch);
416                 if (remote &&
417                     (remote->fetch.nr ||
418                      /* Note: has_merge implies non-NULL branch->remote_name */
419                      (has_merge && !strcmp(branch->remote_name, remote->name)))) {
420                         for (i = 0; i < remote->fetch.nr; i++) {
421                                 get_fetch_map(remote_refs, &remote->fetch.items[i], &tail, 0);
422                                 if (remote->fetch.items[i].dst &&
423                                     remote->fetch.items[i].dst[0])
424                                         *autotags = 1;
425                                 if (!i && !has_merge && ref_map &&
426                                     !remote->fetch.items[0].pattern)
427                                         ref_map->fetch_head_status = FETCH_HEAD_MERGE;
428                         }
429                         /*
430                          * if the remote we're fetching from is the same
431                          * as given in branch.<name>.remote, we add the
432                          * ref given in branch.<name>.merge, too.
433                          *
434                          * Note: has_merge implies non-NULL branch->remote_name
435                          */
436                         if (has_merge &&
437                             !strcmp(branch->remote_name, remote->name))
438                                 add_merge_config(&ref_map, remote_refs, branch, &tail);
439                 } else {
440                         ref_map = get_remote_ref(remote_refs, "HEAD");
441                         if (!ref_map)
442                                 die(_("Couldn't find remote ref HEAD"));
443                         ref_map->fetch_head_status = FETCH_HEAD_MERGE;
444                         tail = &ref_map->next;
445                 }
446         }
447
448         if (tags == TAGS_SET)
449                 /* also fetch all tags */
450                 get_fetch_map(remote_refs, tag_refspec, &tail, 0);
451         else if (tags == TAGS_DEFAULT && *autotags)
452                 find_non_local_tags(transport, &ref_map, &tail);
453
454         /* Now append any refs to be updated opportunistically: */
455         *tail = orefs;
456         for (rm = orefs; rm; rm = rm->next) {
457                 rm->fetch_head_status = FETCH_HEAD_IGNORE;
458                 tail = &rm->next;
459         }
460
461         return ref_remove_duplicates(ref_map);
462 }
463
464 #define STORE_REF_ERROR_OTHER 1
465 #define STORE_REF_ERROR_DF_CONFLICT 2
466
467 static int s_update_ref(const char *action,
468                         struct ref *ref,
469                         int check_old)
470 {
471         char *msg;
472         char *rla = getenv("GIT_REFLOG_ACTION");
473         struct ref_transaction *transaction;
474         struct strbuf err = STRBUF_INIT;
475         int ret, df_conflict = 0;
476
477         if (dry_run)
478                 return 0;
479         if (!rla)
480                 rla = default_rla.buf;
481         msg = xstrfmt("%s: %s", rla, action);
482
483         transaction = ref_transaction_begin(&err);
484         if (!transaction ||
485             ref_transaction_update(transaction, ref->name,
486                                    &ref->new_oid,
487                                    check_old ? &ref->old_oid : NULL,
488                                    0, msg, &err))
489                 goto fail;
490
491         ret = ref_transaction_commit(transaction, &err);
492         if (ret) {
493                 df_conflict = (ret == TRANSACTION_NAME_CONFLICT);
494                 goto fail;
495         }
496
497         ref_transaction_free(transaction);
498         strbuf_release(&err);
499         free(msg);
500         return 0;
501 fail:
502         ref_transaction_free(transaction);
503         error("%s", err.buf);
504         strbuf_release(&err);
505         free(msg);
506         return df_conflict ? STORE_REF_ERROR_DF_CONFLICT
507                            : STORE_REF_ERROR_OTHER;
508 }
509
510 static int refcol_width = 10;
511 static int compact_format;
512
513 static void adjust_refcol_width(const struct ref *ref)
514 {
515         int max, rlen, llen, len;
516
517         /* uptodate lines are only shown on high verbosity level */
518         if (!verbosity && !oidcmp(&ref->peer_ref->old_oid, &ref->old_oid))
519                 return;
520
521         max    = term_columns();
522         rlen   = utf8_strwidth(prettify_refname(ref->name));
523
524         llen   = utf8_strwidth(prettify_refname(ref->peer_ref->name));
525
526         /*
527          * rough estimation to see if the output line is too long and
528          * should not be counted (we can't do precise calculation
529          * anyway because we don't know if the error explanation part
530          * will be printed in update_local_ref)
531          */
532         if (compact_format) {
533                 llen = 0;
534                 max = max * 2 / 3;
535         }
536         len = 21 /* flag and summary */ + rlen + 4 /* -> */ + llen;
537         if (len >= max)
538                 return;
539
540         /*
541          * Not precise calculation for compact mode because '*' can
542          * appear on the left hand side of '->' and shrink the column
543          * back.
544          */
545         if (refcol_width < rlen)
546                 refcol_width = rlen;
547 }
548
549 static void prepare_format_display(struct ref *ref_map)
550 {
551         struct ref *rm;
552         const char *format = "full";
553
554         git_config_get_string_const("fetch.output", &format);
555         if (!strcasecmp(format, "full"))
556                 compact_format = 0;
557         else if (!strcasecmp(format, "compact"))
558                 compact_format = 1;
559         else
560                 die(_("configuration fetch.output contains invalid value %s"),
561                     format);
562
563         for (rm = ref_map; rm; rm = rm->next) {
564                 if (rm->status == REF_STATUS_REJECT_SHALLOW ||
565                     !rm->peer_ref ||
566                     !strcmp(rm->name, "HEAD"))
567                         continue;
568
569                 adjust_refcol_width(rm);
570         }
571 }
572
573 static void print_remote_to_local(struct strbuf *display,
574                                   const char *remote, const char *local)
575 {
576         strbuf_addf(display, "%-*s -> %s", refcol_width, remote, local);
577 }
578
579 static int find_and_replace(struct strbuf *haystack,
580                             const char *needle,
581                             const char *placeholder)
582 {
583         const char *p = strstr(haystack->buf, needle);
584         int plen, nlen;
585
586         if (!p)
587                 return 0;
588
589         if (p > haystack->buf && p[-1] != '/')
590                 return 0;
591
592         plen = strlen(p);
593         nlen = strlen(needle);
594         if (plen > nlen && p[nlen] != '/')
595                 return 0;
596
597         strbuf_splice(haystack, p - haystack->buf, nlen,
598                       placeholder, strlen(placeholder));
599         return 1;
600 }
601
602 static void print_compact(struct strbuf *display,
603                           const char *remote, const char *local)
604 {
605         struct strbuf r = STRBUF_INIT;
606         struct strbuf l = STRBUF_INIT;
607
608         if (!strcmp(remote, local)) {
609                 strbuf_addf(display, "%-*s -> *", refcol_width, remote);
610                 return;
611         }
612
613         strbuf_addstr(&r, remote);
614         strbuf_addstr(&l, local);
615
616         if (!find_and_replace(&r, local, "*"))
617                 find_and_replace(&l, remote, "*");
618         print_remote_to_local(display, r.buf, l.buf);
619
620         strbuf_release(&r);
621         strbuf_release(&l);
622 }
623
624 static void format_display(struct strbuf *display, char code,
625                            const char *summary, const char *error,
626                            const char *remote, const char *local,
627                            int summary_width)
628 {
629         int width = (summary_width + strlen(summary) - gettext_width(summary));
630
631         strbuf_addf(display, "%c %-*s ", code, width, summary);
632         if (!compact_format)
633                 print_remote_to_local(display, remote, local);
634         else
635                 print_compact(display, remote, local);
636         if (error)
637                 strbuf_addf(display, "  (%s)", error);
638 }
639
640 static int update_local_ref(struct ref *ref,
641                             const char *remote,
642                             const struct ref *remote_ref,
643                             struct strbuf *display,
644                             int summary_width)
645 {
646         struct commit *current = NULL, *updated;
647         enum object_type type;
648         struct branch *current_branch = branch_get(NULL);
649         const char *pretty_ref = prettify_refname(ref->name);
650
651         type = oid_object_info(the_repository, &ref->new_oid, NULL);
652         if (type < 0)
653                 die(_("object %s not found"), oid_to_hex(&ref->new_oid));
654
655         if (!oidcmp(&ref->old_oid, &ref->new_oid)) {
656                 if (verbosity > 0)
657                         format_display(display, '=', _("[up to date]"), NULL,
658                                        remote, pretty_ref, summary_width);
659                 return 0;
660         }
661
662         if (current_branch &&
663             !strcmp(ref->name, current_branch->name) &&
664             !(update_head_ok || is_bare_repository()) &&
665             !is_null_oid(&ref->old_oid)) {
666                 /*
667                  * If this is the head, and it's not okay to update
668                  * the head, and the old value of the head isn't empty...
669                  */
670                 format_display(display, '!', _("[rejected]"),
671                                _("can't fetch in current branch"),
672                                remote, pretty_ref, summary_width);
673                 return 1;
674         }
675
676         if (!is_null_oid(&ref->old_oid) &&
677             starts_with(ref->name, "refs/tags/")) {
678                 int r;
679                 r = s_update_ref("updating tag", ref, 0);
680                 format_display(display, r ? '!' : 't', _("[tag update]"),
681                                r ? _("unable to update local ref") : NULL,
682                                remote, pretty_ref, summary_width);
683                 return r;
684         }
685
686         current = lookup_commit_reference_gently(&ref->old_oid, 1);
687         updated = lookup_commit_reference_gently(&ref->new_oid, 1);
688         if (!current || !updated) {
689                 const char *msg;
690                 const char *what;
691                 int r;
692                 /*
693                  * Nicely describe the new ref we're fetching.
694                  * Base this on the remote's ref name, as it's
695                  * more likely to follow a standard layout.
696                  */
697                 const char *name = remote_ref ? remote_ref->name : "";
698                 if (starts_with(name, "refs/tags/")) {
699                         msg = "storing tag";
700                         what = _("[new tag]");
701                 } else if (starts_with(name, "refs/heads/")) {
702                         msg = "storing head";
703                         what = _("[new branch]");
704                 } else {
705                         msg = "storing ref";
706                         what = _("[new ref]");
707                 }
708
709                 if ((recurse_submodules != RECURSE_SUBMODULES_OFF) &&
710                     (recurse_submodules != RECURSE_SUBMODULES_ON))
711                         check_for_new_submodule_commits(&ref->new_oid);
712                 r = s_update_ref(msg, ref, 0);
713                 format_display(display, r ? '!' : '*', what,
714                                r ? _("unable to update local ref") : NULL,
715                                remote, pretty_ref, summary_width);
716                 return r;
717         }
718
719         if (in_merge_bases(current, updated)) {
720                 struct strbuf quickref = STRBUF_INIT;
721                 int r;
722                 strbuf_add_unique_abbrev(&quickref, &current->object.oid, DEFAULT_ABBREV);
723                 strbuf_addstr(&quickref, "..");
724                 strbuf_add_unique_abbrev(&quickref, &ref->new_oid, DEFAULT_ABBREV);
725                 if ((recurse_submodules != RECURSE_SUBMODULES_OFF) &&
726                     (recurse_submodules != RECURSE_SUBMODULES_ON))
727                         check_for_new_submodule_commits(&ref->new_oid);
728                 r = s_update_ref("fast-forward", ref, 1);
729                 format_display(display, r ? '!' : ' ', quickref.buf,
730                                r ? _("unable to update local ref") : NULL,
731                                remote, pretty_ref, summary_width);
732                 strbuf_release(&quickref);
733                 return r;
734         } else if (force || ref->force) {
735                 struct strbuf quickref = STRBUF_INIT;
736                 int r;
737                 strbuf_add_unique_abbrev(&quickref, &current->object.oid, DEFAULT_ABBREV);
738                 strbuf_addstr(&quickref, "...");
739                 strbuf_add_unique_abbrev(&quickref, &ref->new_oid, DEFAULT_ABBREV);
740                 if ((recurse_submodules != RECURSE_SUBMODULES_OFF) &&
741                     (recurse_submodules != RECURSE_SUBMODULES_ON))
742                         check_for_new_submodule_commits(&ref->new_oid);
743                 r = s_update_ref("forced-update", ref, 1);
744                 format_display(display, r ? '!' : '+', quickref.buf,
745                                r ? _("unable to update local ref") : _("forced update"),
746                                remote, pretty_ref, summary_width);
747                 strbuf_release(&quickref);
748                 return r;
749         } else {
750                 format_display(display, '!', _("[rejected]"), _("non-fast-forward"),
751                                remote, pretty_ref, summary_width);
752                 return 1;
753         }
754 }
755
756 static int iterate_ref_map(void *cb_data, struct object_id *oid)
757 {
758         struct ref **rm = cb_data;
759         struct ref *ref = *rm;
760
761         while (ref && ref->status == REF_STATUS_REJECT_SHALLOW)
762                 ref = ref->next;
763         if (!ref)
764                 return -1; /* end of the list */
765         *rm = ref->next;
766         oidcpy(oid, &ref->old_oid);
767         return 0;
768 }
769
770 static int store_updated_refs(const char *raw_url, const char *remote_name,
771                 struct ref *ref_map)
772 {
773         FILE *fp;
774         struct commit *commit;
775         int url_len, i, rc = 0;
776         struct strbuf note = STRBUF_INIT;
777         const char *what, *kind;
778         struct ref *rm;
779         char *url;
780         const char *filename = dry_run ? "/dev/null" : git_path_fetch_head();
781         int want_status;
782         int summary_width = transport_summary_width(ref_map);
783
784         fp = fopen(filename, "a");
785         if (!fp)
786                 return error_errno(_("cannot open %s"), filename);
787
788         if (raw_url)
789                 url = transport_anonymize_url(raw_url);
790         else
791                 url = xstrdup("foreign");
792
793         rm = ref_map;
794         if (check_connected(iterate_ref_map, &rm, NULL)) {
795                 rc = error(_("%s did not send all necessary objects\n"), url);
796                 goto abort;
797         }
798
799         prepare_format_display(ref_map);
800
801         /*
802          * We do a pass for each fetch_head_status type in their enum order, so
803          * merged entries are written before not-for-merge. That lets readers
804          * use FETCH_HEAD as a refname to refer to the ref to be merged.
805          */
806         for (want_status = FETCH_HEAD_MERGE;
807              want_status <= FETCH_HEAD_IGNORE;
808              want_status++) {
809                 for (rm = ref_map; rm; rm = rm->next) {
810                         struct ref *ref = NULL;
811                         const char *merge_status_marker = "";
812
813                         if (rm->status == REF_STATUS_REJECT_SHALLOW) {
814                                 if (want_status == FETCH_HEAD_MERGE)
815                                         warning(_("reject %s because shallow roots are not allowed to be updated"),
816                                                 rm->peer_ref ? rm->peer_ref->name : rm->name);
817                                 continue;
818                         }
819
820                         commit = lookup_commit_reference_gently(&rm->old_oid,
821                                                                 1);
822                         if (!commit)
823                                 rm->fetch_head_status = FETCH_HEAD_NOT_FOR_MERGE;
824
825                         if (rm->fetch_head_status != want_status)
826                                 continue;
827
828                         if (rm->peer_ref) {
829                                 ref = alloc_ref(rm->peer_ref->name);
830                                 oidcpy(&ref->old_oid, &rm->peer_ref->old_oid);
831                                 oidcpy(&ref->new_oid, &rm->old_oid);
832                                 ref->force = rm->peer_ref->force;
833                         }
834
835
836                         if (!strcmp(rm->name, "HEAD")) {
837                                 kind = "";
838                                 what = "";
839                         }
840                         else if (starts_with(rm->name, "refs/heads/")) {
841                                 kind = "branch";
842                                 what = rm->name + 11;
843                         }
844                         else if (starts_with(rm->name, "refs/tags/")) {
845                                 kind = "tag";
846                                 what = rm->name + 10;
847                         }
848                         else if (starts_with(rm->name, "refs/remotes/")) {
849                                 kind = "remote-tracking branch";
850                                 what = rm->name + 13;
851                         }
852                         else {
853                                 kind = "";
854                                 what = rm->name;
855                         }
856
857                         url_len = strlen(url);
858                         for (i = url_len - 1; url[i] == '/' && 0 <= i; i--)
859                                 ;
860                         url_len = i + 1;
861                         if (4 < i && !strncmp(".git", url + i - 3, 4))
862                                 url_len = i - 3;
863
864                         strbuf_reset(&note);
865                         if (*what) {
866                                 if (*kind)
867                                         strbuf_addf(&note, "%s ", kind);
868                                 strbuf_addf(&note, "'%s' of ", what);
869                         }
870                         switch (rm->fetch_head_status) {
871                         case FETCH_HEAD_NOT_FOR_MERGE:
872                                 merge_status_marker = "not-for-merge";
873                                 /* fall-through */
874                         case FETCH_HEAD_MERGE:
875                                 fprintf(fp, "%s\t%s\t%s",
876                                         oid_to_hex(&rm->old_oid),
877                                         merge_status_marker,
878                                         note.buf);
879                                 for (i = 0; i < url_len; ++i)
880                                         if ('\n' == url[i])
881                                                 fputs("\\n", fp);
882                                         else
883                                                 fputc(url[i], fp);
884                                 fputc('\n', fp);
885                                 break;
886                         default:
887                                 /* do not write anything to FETCH_HEAD */
888                                 break;
889                         }
890
891                         strbuf_reset(&note);
892                         if (ref) {
893                                 rc |= update_local_ref(ref, what, rm, &note,
894                                                        summary_width);
895                                 free(ref);
896                         } else
897                                 format_display(&note, '*',
898                                                *kind ? kind : "branch", NULL,
899                                                *what ? what : "HEAD",
900                                                "FETCH_HEAD", summary_width);
901                         if (note.len) {
902                                 if (verbosity >= 0 && !shown_url) {
903                                         fprintf(stderr, _("From %.*s\n"),
904                                                         url_len, url);
905                                         shown_url = 1;
906                                 }
907                                 if (verbosity >= 0)
908                                         fprintf(stderr, " %s\n", note.buf);
909                         }
910                 }
911         }
912
913         if (rc & STORE_REF_ERROR_DF_CONFLICT)
914                 error(_("some local refs could not be updated; try running\n"
915                       " 'git remote prune %s' to remove any old, conflicting "
916                       "branches"), remote_name);
917
918  abort:
919         strbuf_release(&note);
920         free(url);
921         fclose(fp);
922         return rc;
923 }
924
925 /*
926  * We would want to bypass the object transfer altogether if
927  * everything we are going to fetch already exists and is connected
928  * locally.
929  */
930 static int quickfetch(struct ref *ref_map)
931 {
932         struct ref *rm = ref_map;
933         struct check_connected_options opt = CHECK_CONNECTED_INIT;
934
935         /*
936          * If we are deepening a shallow clone we already have these
937          * objects reachable.  Running rev-list here will return with
938          * a good (0) exit status and we'll bypass the fetch that we
939          * really need to perform.  Claiming failure now will ensure
940          * we perform the network exchange to deepen our history.
941          */
942         if (deepen)
943                 return -1;
944         opt.quiet = 1;
945         return check_connected(iterate_ref_map, &rm, &opt);
946 }
947
948 static int fetch_refs(struct transport *transport, struct ref *ref_map)
949 {
950         int ret = quickfetch(ref_map);
951         if (ret)
952                 ret = transport_fetch_refs(transport, ref_map);
953         if (!ret)
954                 ret |= store_updated_refs(transport->url,
955                                 transport->remote->name,
956                                 ref_map);
957         transport_unlock_pack(transport);
958         return ret;
959 }
960
961 static int prune_refs(struct refspec *rs, struct ref *ref_map,
962                       const char *raw_url)
963 {
964         int url_len, i, result = 0;
965         struct ref *ref, *stale_refs = get_stale_heads(rs, ref_map);
966         char *url;
967         int summary_width = transport_summary_width(stale_refs);
968         const char *dangling_msg = dry_run
969                 ? _("   (%s will become dangling)")
970                 : _("   (%s has become dangling)");
971
972         if (raw_url)
973                 url = transport_anonymize_url(raw_url);
974         else
975                 url = xstrdup("foreign");
976
977         url_len = strlen(url);
978         for (i = url_len - 1; url[i] == '/' && 0 <= i; i--)
979                 ;
980
981         url_len = i + 1;
982         if (4 < i && !strncmp(".git", url + i - 3, 4))
983                 url_len = i - 3;
984
985         if (!dry_run) {
986                 struct string_list refnames = STRING_LIST_INIT_NODUP;
987
988                 for (ref = stale_refs; ref; ref = ref->next)
989                         string_list_append(&refnames, ref->name);
990
991                 result = delete_refs("fetch: prune", &refnames, 0);
992                 string_list_clear(&refnames, 0);
993         }
994
995         if (verbosity >= 0) {
996                 for (ref = stale_refs; ref; ref = ref->next) {
997                         struct strbuf sb = STRBUF_INIT;
998                         if (!shown_url) {
999                                 fprintf(stderr, _("From %.*s\n"), url_len, url);
1000                                 shown_url = 1;
1001                         }
1002                         format_display(&sb, '-', _("[deleted]"), NULL,
1003                                        _("(none)"), prettify_refname(ref->name),
1004                                        summary_width);
1005                         fprintf(stderr, " %s\n",sb.buf);
1006                         strbuf_release(&sb);
1007                         warn_dangling_symref(stderr, dangling_msg, ref->name);
1008                 }
1009         }
1010
1011         free(url);
1012         free_refs(stale_refs);
1013         return result;
1014 }
1015
1016 static void check_not_current_branch(struct ref *ref_map)
1017 {
1018         struct branch *current_branch = branch_get(NULL);
1019
1020         if (is_bare_repository() || !current_branch)
1021                 return;
1022
1023         for (; ref_map; ref_map = ref_map->next)
1024                 if (ref_map->peer_ref && !strcmp(current_branch->refname,
1025                                         ref_map->peer_ref->name))
1026                         die(_("Refusing to fetch into current branch %s "
1027                             "of non-bare repository"), current_branch->refname);
1028 }
1029
1030 static int truncate_fetch_head(void)
1031 {
1032         const char *filename = git_path_fetch_head();
1033         FILE *fp = fopen_for_writing(filename);
1034
1035         if (!fp)
1036                 return error_errno(_("cannot open %s"), filename);
1037         fclose(fp);
1038         return 0;
1039 }
1040
1041 static void set_option(struct transport *transport, const char *name, const char *value)
1042 {
1043         int r = transport_set_option(transport, name, value);
1044         if (r < 0)
1045                 die(_("Option \"%s\" value \"%s\" is not valid for %s"),
1046                     name, value, transport->url);
1047         if (r > 0)
1048                 warning(_("Option \"%s\" is ignored for %s\n"),
1049                         name, transport->url);
1050 }
1051
1052 static struct transport *prepare_transport(struct remote *remote, int deepen)
1053 {
1054         struct transport *transport;
1055         transport = transport_get(remote, NULL);
1056         transport_set_verbosity(transport, verbosity, progress);
1057         transport->family = family;
1058         if (upload_pack)
1059                 set_option(transport, TRANS_OPT_UPLOADPACK, upload_pack);
1060         if (keep)
1061                 set_option(transport, TRANS_OPT_KEEP, "yes");
1062         if (depth)
1063                 set_option(transport, TRANS_OPT_DEPTH, depth);
1064         if (deepen && deepen_since)
1065                 set_option(transport, TRANS_OPT_DEEPEN_SINCE, deepen_since);
1066         if (deepen && deepen_not.nr)
1067                 set_option(transport, TRANS_OPT_DEEPEN_NOT,
1068                            (const char *)&deepen_not);
1069         if (deepen_relative)
1070                 set_option(transport, TRANS_OPT_DEEPEN_RELATIVE, "yes");
1071         if (update_shallow)
1072                 set_option(transport, TRANS_OPT_UPDATE_SHALLOW, "yes");
1073         if (filter_options.choice) {
1074                 set_option(transport, TRANS_OPT_LIST_OBJECTS_FILTER,
1075                            filter_options.filter_spec);
1076                 set_option(transport, TRANS_OPT_FROM_PROMISOR, "1");
1077         }
1078         return transport;
1079 }
1080
1081 static void backfill_tags(struct transport *transport, struct ref *ref_map)
1082 {
1083         int cannot_reuse;
1084
1085         /*
1086          * Once we have set TRANS_OPT_DEEPEN_SINCE, we can't unset it
1087          * when remote helper is used (setting it to an empty string
1088          * is not unsetting). We could extend the remote helper
1089          * protocol for that, but for now, just force a new connection
1090          * without deepen-since. Similar story for deepen-not.
1091          */
1092         cannot_reuse = transport->cannot_reuse ||
1093                 deepen_since || deepen_not.nr;
1094         if (cannot_reuse) {
1095                 gsecondary = prepare_transport(transport->remote, 0);
1096                 transport = gsecondary;
1097         }
1098
1099         transport_set_option(transport, TRANS_OPT_FOLLOWTAGS, NULL);
1100         transport_set_option(transport, TRANS_OPT_DEPTH, "0");
1101         transport_set_option(transport, TRANS_OPT_DEEPEN_RELATIVE, NULL);
1102         fetch_refs(transport, ref_map);
1103
1104         if (gsecondary) {
1105                 transport_disconnect(gsecondary);
1106                 gsecondary = NULL;
1107         }
1108 }
1109
1110 static int do_fetch(struct transport *transport,
1111                     struct refspec *rs)
1112 {
1113         struct string_list existing_refs = STRING_LIST_INIT_DUP;
1114         struct ref *ref_map;
1115         struct ref *rm;
1116         int autotags = (transport->remote->fetch_tags == 1);
1117         int retcode = 0;
1118
1119         for_each_ref(add_existing, &existing_refs);
1120
1121         if (tags == TAGS_DEFAULT) {
1122                 if (transport->remote->fetch_tags == 2)
1123                         tags = TAGS_SET;
1124                 if (transport->remote->fetch_tags == -1)
1125                         tags = TAGS_UNSET;
1126         }
1127
1128         /* if not appending, truncate FETCH_HEAD */
1129         if (!append && !dry_run) {
1130                 retcode = truncate_fetch_head();
1131                 if (retcode)
1132                         goto cleanup;
1133         }
1134
1135         ref_map = get_ref_map(transport, rs, tags, &autotags);
1136         if (!update_head_ok)
1137                 check_not_current_branch(ref_map);
1138
1139         for (rm = ref_map; rm; rm = rm->next) {
1140                 if (rm->peer_ref) {
1141                         struct string_list_item *peer_item =
1142                                 string_list_lookup(&existing_refs,
1143                                                    rm->peer_ref->name);
1144                         if (peer_item) {
1145                                 struct object_id *old_oid = peer_item->util;
1146                                 oidcpy(&rm->peer_ref->old_oid, old_oid);
1147                         }
1148                 }
1149         }
1150
1151         if (tags == TAGS_DEFAULT && autotags)
1152                 transport_set_option(transport, TRANS_OPT_FOLLOWTAGS, "1");
1153         if (prune) {
1154                 /*
1155                  * We only prune based on refspecs specified
1156                  * explicitly (via command line or configuration); we
1157                  * don't care whether --tags was specified.
1158                  */
1159                 if (rs->nr) {
1160                         prune_refs(rs, ref_map, transport->url);
1161                 } else {
1162                         prune_refs(&transport->remote->fetch,
1163                                    ref_map,
1164                                    transport->url);
1165                 }
1166         }
1167         if (fetch_refs(transport, ref_map)) {
1168                 free_refs(ref_map);
1169                 retcode = 1;
1170                 goto cleanup;
1171         }
1172         free_refs(ref_map);
1173
1174         /* if neither --no-tags nor --tags was specified, do automated tag
1175          * following ... */
1176         if (tags == TAGS_DEFAULT && autotags) {
1177                 struct ref **tail = &ref_map;
1178                 ref_map = NULL;
1179                 find_non_local_tags(transport, &ref_map, &tail);
1180                 if (ref_map)
1181                         backfill_tags(transport, ref_map);
1182                 free_refs(ref_map);
1183         }
1184
1185  cleanup:
1186         string_list_clear(&existing_refs, 1);
1187         return retcode;
1188 }
1189
1190 static int get_one_remote_for_fetch(struct remote *remote, void *priv)
1191 {
1192         struct string_list *list = priv;
1193         if (!remote->skip_default_update)
1194                 string_list_append(list, remote->name);
1195         return 0;
1196 }
1197
1198 struct remote_group_data {
1199         const char *name;
1200         struct string_list *list;
1201 };
1202
1203 static int get_remote_group(const char *key, const char *value, void *priv)
1204 {
1205         struct remote_group_data *g = priv;
1206
1207         if (skip_prefix(key, "remotes.", &key) && !strcmp(key, g->name)) {
1208                 /* split list by white space */
1209                 while (*value) {
1210                         size_t wordlen = strcspn(value, " \t\n");
1211
1212                         if (wordlen >= 1)
1213                                 string_list_append_nodup(g->list,
1214                                                    xstrndup(value, wordlen));
1215                         value += wordlen + (value[wordlen] != '\0');
1216                 }
1217         }
1218
1219         return 0;
1220 }
1221
1222 static int add_remote_or_group(const char *name, struct string_list *list)
1223 {
1224         int prev_nr = list->nr;
1225         struct remote_group_data g;
1226         g.name = name; g.list = list;
1227
1228         git_config(get_remote_group, &g);
1229         if (list->nr == prev_nr) {
1230                 struct remote *remote = remote_get(name);
1231                 if (!remote_is_configured(remote, 0))
1232                         return 0;
1233                 string_list_append(list, remote->name);
1234         }
1235         return 1;
1236 }
1237
1238 static void add_options_to_argv(struct argv_array *argv)
1239 {
1240         if (dry_run)
1241                 argv_array_push(argv, "--dry-run");
1242         if (prune != -1)
1243                 argv_array_push(argv, prune ? "--prune" : "--no-prune");
1244         if (prune_tags != -1)
1245                 argv_array_push(argv, prune_tags ? "--prune-tags" : "--no-prune-tags");
1246         if (update_head_ok)
1247                 argv_array_push(argv, "--update-head-ok");
1248         if (force)
1249                 argv_array_push(argv, "--force");
1250         if (keep)
1251                 argv_array_push(argv, "--keep");
1252         if (recurse_submodules == RECURSE_SUBMODULES_ON)
1253                 argv_array_push(argv, "--recurse-submodules");
1254         else if (recurse_submodules == RECURSE_SUBMODULES_ON_DEMAND)
1255                 argv_array_push(argv, "--recurse-submodules=on-demand");
1256         if (tags == TAGS_SET)
1257                 argv_array_push(argv, "--tags");
1258         else if (tags == TAGS_UNSET)
1259                 argv_array_push(argv, "--no-tags");
1260         if (verbosity >= 2)
1261                 argv_array_push(argv, "-v");
1262         if (verbosity >= 1)
1263                 argv_array_push(argv, "-v");
1264         else if (verbosity < 0)
1265                 argv_array_push(argv, "-q");
1266
1267 }
1268
1269 static int fetch_multiple(struct string_list *list)
1270 {
1271         int i, result = 0;
1272         struct argv_array argv = ARGV_ARRAY_INIT;
1273
1274         if (!append && !dry_run) {
1275                 int errcode = truncate_fetch_head();
1276                 if (errcode)
1277                         return errcode;
1278         }
1279
1280         argv_array_pushl(&argv, "fetch", "--append", NULL);
1281         add_options_to_argv(&argv);
1282
1283         for (i = 0; i < list->nr; i++) {
1284                 const char *name = list->items[i].string;
1285                 argv_array_push(&argv, name);
1286                 if (verbosity >= 0)
1287                         printf(_("Fetching %s\n"), name);
1288                 if (run_command_v_opt(argv.argv, RUN_GIT_CMD)) {
1289                         error(_("Could not fetch %s"), name);
1290                         result = 1;
1291                 }
1292                 argv_array_pop(&argv);
1293         }
1294
1295         argv_array_clear(&argv);
1296         return result;
1297 }
1298
1299 /*
1300  * Fetching from the promisor remote should use the given filter-spec
1301  * or inherit the default filter-spec from the config.
1302  */
1303 static inline void fetch_one_setup_partial(struct remote *remote)
1304 {
1305         /*
1306          * Explicit --no-filter argument overrides everything, regardless
1307          * of any prior partial clones and fetches.
1308          */
1309         if (filter_options.no_filter)
1310                 return;
1311
1312         /*
1313          * If no prior partial clone/fetch and the current fetch DID NOT
1314          * request a partial-fetch, do a normal fetch.
1315          */
1316         if (!repository_format_partial_clone && !filter_options.choice)
1317                 return;
1318
1319         /*
1320          * If this is the FIRST partial-fetch request, we enable partial
1321          * on this repo and remember the given filter-spec as the default
1322          * for subsequent fetches to this remote.
1323          */
1324         if (!repository_format_partial_clone && filter_options.choice) {
1325                 partial_clone_register(remote->name, &filter_options);
1326                 return;
1327         }
1328
1329         /*
1330          * We are currently limited to only ONE promisor remote and only
1331          * allow partial-fetches from the promisor remote.
1332          */
1333         if (strcmp(remote->name, repository_format_partial_clone)) {
1334                 if (filter_options.choice)
1335                         die(_("--filter can only be used with the remote configured in core.partialClone"));
1336                 return;
1337         }
1338
1339         /*
1340          * Do a partial-fetch from the promisor remote using either the
1341          * explicitly given filter-spec or inherit the filter-spec from
1342          * the config.
1343          */
1344         if (!filter_options.choice)
1345                 partial_clone_get_default_filter_spec(&filter_options);
1346         return;
1347 }
1348
1349 static int fetch_one(struct remote *remote, int argc, const char **argv, int prune_tags_ok)
1350 {
1351         struct refspec rs = REFSPEC_INIT_FETCH;
1352         int i;
1353         int exit_code;
1354         int maybe_prune_tags;
1355         int remote_via_config = remote_is_configured(remote, 0);
1356
1357         if (!remote)
1358                 die(_("No remote repository specified.  Please, specify either a URL or a\n"
1359                     "remote name from which new revisions should be fetched."));
1360
1361         gtransport = prepare_transport(remote, 1);
1362
1363         if (prune < 0) {
1364                 /* no command line request */
1365                 if (0 <= remote->prune)
1366                         prune = remote->prune;
1367                 else if (0 <= fetch_prune_config)
1368                         prune = fetch_prune_config;
1369                 else
1370                         prune = PRUNE_BY_DEFAULT;
1371         }
1372
1373         if (prune_tags < 0) {
1374                 /* no command line request */
1375                 if (0 <= remote->prune_tags)
1376                         prune_tags = remote->prune_tags;
1377                 else if (0 <= fetch_prune_tags_config)
1378                         prune_tags = fetch_prune_tags_config;
1379                 else
1380                         prune_tags = PRUNE_TAGS_BY_DEFAULT;
1381         }
1382
1383         maybe_prune_tags = prune_tags_ok && prune_tags;
1384         if (maybe_prune_tags && remote_via_config)
1385                 refspec_append(&remote->fetch, TAG_REFSPEC);
1386
1387         if (maybe_prune_tags && (argc || !remote_via_config))
1388                 refspec_append(&rs, TAG_REFSPEC);
1389
1390         for (i = 0; i < argc; i++) {
1391                 if (!strcmp(argv[i], "tag")) {
1392                         char *tag;
1393                         i++;
1394                         if (i >= argc)
1395                                 die(_("You need to specify a tag name."));
1396
1397                         tag = xstrfmt("refs/tags/%s:refs/tags/%s",
1398                                       argv[i], argv[i]);
1399                         refspec_append(&rs, tag);
1400                         free(tag);
1401                 } else {
1402                         refspec_append(&rs, argv[i]);
1403                 }
1404         }
1405
1406         if (server_options.nr)
1407                 gtransport->server_options = &server_options;
1408
1409         sigchain_push_common(unlock_pack_on_signal);
1410         atexit(unlock_pack);
1411         exit_code = do_fetch(gtransport, &rs);
1412         refspec_clear(&rs);
1413         transport_disconnect(gtransport);
1414         gtransport = NULL;
1415         return exit_code;
1416 }
1417
1418 int cmd_fetch(int argc, const char **argv, const char *prefix)
1419 {
1420         int i;
1421         struct string_list list = STRING_LIST_INIT_DUP;
1422         struct remote *remote = NULL;
1423         int result = 0;
1424         int prune_tags_ok = 1;
1425         struct argv_array argv_gc_auto = ARGV_ARRAY_INIT;
1426
1427         packet_trace_identity("fetch");
1428
1429         fetch_if_missing = 0;
1430
1431         /* Record the command line for the reflog */
1432         strbuf_addstr(&default_rla, "fetch");
1433         for (i = 1; i < argc; i++)
1434                 strbuf_addf(&default_rla, " %s", argv[i]);
1435
1436         config_from_gitmodules(gitmodules_fetch_config, NULL);
1437         git_config(git_fetch_config, NULL);
1438
1439         argc = parse_options(argc, argv, prefix,
1440                              builtin_fetch_options, builtin_fetch_usage, 0);
1441
1442         if (deepen_relative) {
1443                 if (deepen_relative < 0)
1444                         die(_("Negative depth in --deepen is not supported"));
1445                 if (depth)
1446                         die(_("--deepen and --depth are mutually exclusive"));
1447                 depth = xstrfmt("%d", deepen_relative);
1448         }
1449         if (unshallow) {
1450                 if (depth)
1451                         die(_("--depth and --unshallow cannot be used together"));
1452                 else if (!is_repository_shallow())
1453                         die(_("--unshallow on a complete repository does not make sense"));
1454                 else
1455                         depth = xstrfmt("%d", INFINITE_DEPTH);
1456         }
1457
1458         /* no need to be strict, transport_set_option() will validate it again */
1459         if (depth && atoi(depth) < 1)
1460                 die(_("depth %s is not a positive number"), depth);
1461         if (depth || deepen_since || deepen_not.nr)
1462                 deepen = 1;
1463
1464         if (filter_options.choice && !repository_format_partial_clone)
1465                 die("--filter can only be used when extensions.partialClone is set");
1466
1467         if (all) {
1468                 if (argc == 1)
1469                         die(_("fetch --all does not take a repository argument"));
1470                 else if (argc > 1)
1471                         die(_("fetch --all does not make sense with refspecs"));
1472                 (void) for_each_remote(get_one_remote_for_fetch, &list);
1473         } else if (argc == 0) {
1474                 /* No arguments -- use default remote */
1475                 remote = remote_get(NULL);
1476         } else if (multiple) {
1477                 /* All arguments are assumed to be remotes or groups */
1478                 for (i = 0; i < argc; i++)
1479                         if (!add_remote_or_group(argv[i], &list))
1480                                 die(_("No such remote or remote group: %s"), argv[i]);
1481         } else {
1482                 /* Single remote or group */
1483                 (void) add_remote_or_group(argv[0], &list);
1484                 if (list.nr > 1) {
1485                         /* More than one remote */
1486                         if (argc > 1)
1487                                 die(_("Fetching a group and specifying refspecs does not make sense"));
1488                 } else {
1489                         /* Zero or one remotes */
1490                         remote = remote_get(argv[0]);
1491                         prune_tags_ok = (argc == 1);
1492                         argc--;
1493                         argv++;
1494                 }
1495         }
1496
1497         if (remote) {
1498                 if (filter_options.choice || repository_format_partial_clone)
1499                         fetch_one_setup_partial(remote);
1500                 result = fetch_one(remote, argc, argv, prune_tags_ok);
1501         } else {
1502                 if (filter_options.choice)
1503                         die(_("--filter can only be used with the remote configured in core.partialClone"));
1504                 /* TODO should this also die if we have a previous partial-clone? */
1505                 result = fetch_multiple(&list);
1506         }
1507
1508         if (!result && (recurse_submodules != RECURSE_SUBMODULES_OFF)) {
1509                 struct argv_array options = ARGV_ARRAY_INIT;
1510
1511                 add_options_to_argv(&options);
1512                 result = fetch_populated_submodules(the_repository,
1513                                                     &options,
1514                                                     submodule_prefix,
1515                                                     recurse_submodules,
1516                                                     recurse_submodules_default,
1517                                                     verbosity < 0,
1518                                                     max_children);
1519                 argv_array_clear(&options);
1520         }
1521
1522         string_list_clear(&list, 0);
1523
1524         close_all_packs(the_repository->objects);
1525
1526         argv_array_pushl(&argv_gc_auto, "gc", "--auto", NULL);
1527         if (verbosity < 0)
1528                 argv_array_push(&argv_gc_auto, "--quiet");
1529         run_command_v_opt(argv_gc_auto.argv, RUN_GIT_CMD);
1530         argv_array_clear(&argv_gc_auto);
1531
1532         return result;
1533 }