fetch: trivial cleanup
[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 "object-store.h"
10 #include "commit.h"
11 #include "builtin.h"
12 #include "string-list.h"
13 #include "remote.h"
14 #include "transport.h"
15 #include "run-command.h"
16 #include "parse-options.h"
17 #include "sigchain.h"
18 #include "submodule-config.h"
19 #include "submodule.h"
20 #include "connected.h"
21 #include "argv-array.h"
22 #include "utf8.h"
23 #include "packfile.h"
24 #include "list-objects-filter-options.h"
25 #include "commit-reach.h"
26
27 static const char * const builtin_fetch_usage[] = {
28         N_("git fetch [<options>] [<repository> [<refspec>...]]"),
29         N_("git fetch [<options>] <group>"),
30         N_("git fetch --multiple [<options>] [(<repository> | <group>)...]"),
31         N_("git fetch --all [<options>]"),
32         NULL
33 };
34
35 enum {
36         TAGS_UNSET = 0,
37         TAGS_DEFAULT = 1,
38         TAGS_SET = 2
39 };
40
41 static int fetch_prune_config = -1; /* unspecified */
42 static int prune = -1; /* unspecified */
43 #define PRUNE_BY_DEFAULT 0 /* do we prune by default? */
44
45 static int fetch_prune_tags_config = -1; /* unspecified */
46 static int prune_tags = -1; /* unspecified */
47 #define PRUNE_TAGS_BY_DEFAULT 0 /* do we prune tags by default? */
48
49 static int all, append, dry_run, force, keep, multiple, update_head_ok, verbosity, deepen_relative;
50 static int progress = -1;
51 static int tags = TAGS_DEFAULT, unshallow, update_shallow, deepen;
52 static int max_children = 1;
53 static enum transport_family family;
54 static const char *depth;
55 static const char *deepen_since;
56 static const char *upload_pack;
57 static struct string_list deepen_not = STRING_LIST_INIT_NODUP;
58 static struct strbuf default_rla = STRBUF_INIT;
59 static struct transport *gtransport;
60 static struct transport *gsecondary;
61 static const char *submodule_prefix = "";
62 static int recurse_submodules = RECURSE_SUBMODULES_DEFAULT;
63 static int recurse_submodules_default = RECURSE_SUBMODULES_ON_DEMAND;
64 static int shown_url = 0;
65 static struct refspec refmap = REFSPEC_INIT_FETCH;
66 static struct list_objects_filter_options filter_options;
67 static struct string_list server_options = STRING_LIST_INIT_DUP;
68 static struct string_list negotiation_tip = STRING_LIST_INIT_NODUP;
69
70 static int git_fetch_config(const char *k, const char *v, void *cb)
71 {
72         if (!strcmp(k, "fetch.prune")) {
73                 fetch_prune_config = git_config_bool(k, v);
74                 return 0;
75         }
76
77         if (!strcmp(k, "fetch.prunetags")) {
78                 fetch_prune_tags_config = git_config_bool(k, v);
79                 return 0;
80         }
81
82         if (!strcmp(k, "submodule.recurse")) {
83                 int r = git_config_bool(k, v) ?
84                         RECURSE_SUBMODULES_ON : RECURSE_SUBMODULES_OFF;
85                 recurse_submodules = r;
86         }
87
88         if (!strcmp(k, "submodule.fetchjobs")) {
89                 max_children = parse_submodule_fetchjobs(k, v);
90                 return 0;
91         } else if (!strcmp(k, "fetch.recursesubmodules")) {
92                 recurse_submodules = parse_fetch_recurse_submodules_arg(k, v);
93                 return 0;
94         }
95
96         return git_default_config(k, v, cb);
97 }
98
99 static int parse_refmap_arg(const struct option *opt, const char *arg, int unset)
100 {
101         /*
102          * "git fetch --refmap='' origin foo"
103          * can be used to tell the command not to store anywhere
104          */
105         refspec_append(&refmap, arg);
106
107         return 0;
108 }
109
110 static struct option builtin_fetch_options[] = {
111         OPT__VERBOSITY(&verbosity),
112         OPT_BOOL(0, "all", &all,
113                  N_("fetch from all remotes")),
114         OPT_BOOL('a', "append", &append,
115                  N_("append to .git/FETCH_HEAD instead of overwriting")),
116         OPT_STRING(0, "upload-pack", &upload_pack, N_("path"),
117                    N_("path to upload pack on remote end")),
118         OPT__FORCE(&force, N_("force overwrite of local reference"), 0),
119         OPT_BOOL('m', "multiple", &multiple,
120                  N_("fetch from multiple remotes")),
121         OPT_SET_INT('t', "tags", &tags,
122                     N_("fetch all tags and associated objects"), TAGS_SET),
123         OPT_SET_INT('n', NULL, &tags,
124                     N_("do not fetch all tags (--no-tags)"), TAGS_UNSET),
125         OPT_INTEGER('j', "jobs", &max_children,
126                     N_("number of submodules fetched in parallel")),
127         OPT_BOOL('p', "prune", &prune,
128                  N_("prune remote-tracking branches no longer on remote")),
129         OPT_BOOL('P', "prune-tags", &prune_tags,
130                  N_("prune local tags no longer on remote and clobber changed tags")),
131         { OPTION_CALLBACK, 0, "recurse-submodules", &recurse_submodules, N_("on-demand"),
132                     N_("control recursive fetching of submodules"),
133                     PARSE_OPT_OPTARG, option_fetch_parse_recurse_submodules },
134         OPT_BOOL(0, "dry-run", &dry_run,
135                  N_("dry run")),
136         OPT_BOOL('k', "keep", &keep, N_("keep downloaded pack")),
137         OPT_BOOL('u', "update-head-ok", &update_head_ok,
138                     N_("allow updating of HEAD ref")),
139         OPT_BOOL(0, "progress", &progress, N_("force progress reporting")),
140         OPT_STRING(0, "depth", &depth, N_("depth"),
141                    N_("deepen history of shallow clone")),
142         OPT_STRING(0, "shallow-since", &deepen_since, N_("time"),
143                    N_("deepen history of shallow repository based on time")),
144         OPT_STRING_LIST(0, "shallow-exclude", &deepen_not, N_("revision"),
145                         N_("deepen history of shallow clone, excluding rev")),
146         OPT_INTEGER(0, "deepen", &deepen_relative,
147                     N_("deepen history of shallow clone")),
148         OPT_SET_INT_F(0, "unshallow", &unshallow,
149                       N_("convert to a complete repository"),
150                       1, PARSE_OPT_NONEG),
151         { OPTION_STRING, 0, "submodule-prefix", &submodule_prefix, N_("dir"),
152                    N_("prepend this to submodule path output"), PARSE_OPT_HIDDEN },
153         { OPTION_CALLBACK, 0, "recurse-submodules-default",
154                    &recurse_submodules_default, N_("on-demand"),
155                    N_("default for recursive fetching of submodules "
156                       "(lower priority than config files)"),
157                    PARSE_OPT_HIDDEN, option_fetch_parse_recurse_submodules },
158         OPT_BOOL(0, "update-shallow", &update_shallow,
159                  N_("accept refs that update .git/shallow")),
160         { OPTION_CALLBACK, 0, "refmap", NULL, N_("refmap"),
161           N_("specify fetch refmap"), PARSE_OPT_NONEG, parse_refmap_arg },
162         OPT_STRING_LIST('o', "server-option", &server_options, N_("server-specific"), N_("option to transmit")),
163         OPT_SET_INT('4', "ipv4", &family, N_("use IPv4 addresses only"),
164                         TRANSPORT_FAMILY_IPV4),
165         OPT_SET_INT('6', "ipv6", &family, N_("use IPv6 addresses only"),
166                         TRANSPORT_FAMILY_IPV6),
167         OPT_STRING_LIST(0, "negotiation-tip", &negotiation_tip, N_("revision"),
168                         N_("report that we have only objects reachable from this object")),
169         OPT_PARSE_LIST_OBJECTS_FILTER(&filter_options),
170         OPT_END()
171 };
172
173 static void unlock_pack(void)
174 {
175         if (gtransport)
176                 transport_unlock_pack(gtransport);
177         if (gsecondary)
178                 transport_unlock_pack(gsecondary);
179 }
180
181 static void unlock_pack_on_signal(int signo)
182 {
183         unlock_pack();
184         sigchain_pop(signo);
185         raise(signo);
186 }
187
188 static void add_merge_config(struct ref **head,
189                            const struct ref *remote_refs,
190                            struct branch *branch,
191                            struct ref ***tail)
192 {
193         int i;
194
195         for (i = 0; i < branch->merge_nr; i++) {
196                 struct ref *rm, **old_tail = *tail;
197                 struct refspec_item refspec;
198
199                 for (rm = *head; rm; rm = rm->next) {
200                         if (branch_merge_matches(branch, i, rm->name)) {
201                                 rm->fetch_head_status = FETCH_HEAD_MERGE;
202                                 break;
203                         }
204                 }
205                 if (rm)
206                         continue;
207
208                 /*
209                  * Not fetched to a remote-tracking branch?  We need to fetch
210                  * it anyway to allow this branch's "branch.$name.merge"
211                  * to be honored by 'git pull', but we do not have to
212                  * fail if branch.$name.merge is misconfigured to point
213                  * at a nonexisting branch.  If we were indeed called by
214                  * 'git pull', it will notice the misconfiguration because
215                  * there is no entry in the resulting FETCH_HEAD marked
216                  * for merging.
217                  */
218                 memset(&refspec, 0, sizeof(refspec));
219                 refspec.src = branch->merge[i]->src;
220                 get_fetch_map(remote_refs, &refspec, tail, 1);
221                 for (rm = *old_tail; rm; rm = rm->next)
222                         rm->fetch_head_status = FETCH_HEAD_MERGE;
223         }
224 }
225
226 static int will_fetch(struct ref **head, const unsigned char *sha1)
227 {
228         struct ref *rm = *head;
229         while (rm) {
230                 if (hasheq(rm->old_oid.hash, sha1))
231                         return 1;
232                 rm = rm->next;
233         }
234         return 0;
235 }
236
237 struct refname_hash_entry {
238         struct hashmap_entry ent; /* must be the first member */
239         struct object_id oid;
240         char refname[FLEX_ARRAY];
241 };
242
243 static int refname_hash_entry_cmp(const void *hashmap_cmp_fn_data,
244                                   const void *e1_,
245                                   const void *e2_,
246                                   const void *keydata)
247 {
248         const struct refname_hash_entry *e1 = e1_;
249         const struct refname_hash_entry *e2 = e2_;
250
251         return strcmp(e1->refname, keydata ? keydata : e2->refname);
252 }
253
254 static struct refname_hash_entry *refname_hash_add(struct hashmap *map,
255                                                    const char *refname,
256                                                    const struct object_id *oid)
257 {
258         struct refname_hash_entry *ent;
259         size_t len = strlen(refname);
260
261         FLEX_ALLOC_MEM(ent, refname, refname, len);
262         hashmap_entry_init(ent, strhash(refname));
263         oidcpy(&ent->oid, oid);
264         hashmap_add(map, ent);
265         return ent;
266 }
267
268 static int add_one_refname(const char *refname,
269                            const struct object_id *oid,
270                            int flag, void *cbdata)
271 {
272         struct hashmap *refname_map = cbdata;
273
274         (void) refname_hash_add(refname_map, refname, oid);
275         return 0;
276 }
277
278 static void refname_hash_init(struct hashmap *map)
279 {
280         hashmap_init(map, refname_hash_entry_cmp, NULL, 0);
281 }
282
283 static int refname_hash_exists(struct hashmap *map, const char *refname)
284 {
285         return !!hashmap_get_from_hash(map, strhash(refname), refname);
286 }
287
288 static void clear_item(struct refname_hash_entry *item)
289 {
290         oidclr(&item->oid);
291 }
292
293 static void find_non_local_tags(const struct ref *refs,
294                                 struct ref **head,
295                                 struct ref ***tail)
296 {
297         struct hashmap existing_refs;
298         struct hashmap remote_refs;
299         struct string_list remote_refs_list = STRING_LIST_INIT_NODUP;
300         struct string_list_item *remote_ref_item;
301         const struct ref *ref;
302         struct refname_hash_entry *item = NULL;
303
304         refname_hash_init(&existing_refs);
305         refname_hash_init(&remote_refs);
306
307         for_each_ref(add_one_refname, &existing_refs);
308         for (ref = refs; ref; ref = ref->next) {
309                 if (!starts_with(ref->name, "refs/tags/"))
310                         continue;
311
312                 /*
313                  * The peeled ref always follows the matching base
314                  * ref, so if we see a peeled ref that we don't want
315                  * to fetch then we can mark the ref entry in the list
316                  * as one to ignore by setting util to NULL.
317                  */
318                 if (ends_with(ref->name, "^{}")) {
319                         if (item &&
320                             !has_object_file_with_flags(&ref->old_oid,
321                                                         OBJECT_INFO_QUICK) &&
322                             !will_fetch(head, ref->old_oid.hash) &&
323                             !has_sha1_file_with_flags(item->oid.hash,
324                                                       OBJECT_INFO_QUICK) &&
325                             !will_fetch(head, item->oid.hash))
326                                 clear_item(item);
327                         item = NULL;
328                         continue;
329                 }
330
331                 /*
332                  * If item is non-NULL here, then we previously saw a
333                  * ref not followed by a peeled reference, so we need
334                  * to check if it is a lightweight tag that we want to
335                  * fetch.
336                  */
337                 if (item &&
338                     !has_sha1_file_with_flags(item->oid.hash, OBJECT_INFO_QUICK) &&
339                     !will_fetch(head, item->oid.hash))
340                         clear_item(item);
341
342                 item = NULL;
343
344                 /* skip duplicates and refs that we already have */
345                 if (refname_hash_exists(&remote_refs, ref->name) ||
346                     refname_hash_exists(&existing_refs, ref->name))
347                         continue;
348
349                 item = refname_hash_add(&remote_refs, ref->name, &ref->old_oid);
350                 string_list_insert(&remote_refs_list, ref->name);
351         }
352         hashmap_free(&existing_refs, 1);
353
354         /*
355          * We may have a final lightweight tag that needs to be
356          * checked to see if it needs fetching.
357          */
358         if (item &&
359             !has_sha1_file_with_flags(item->oid.hash, OBJECT_INFO_QUICK) &&
360             !will_fetch(head, item->oid.hash))
361                 clear_item(item);
362
363         /*
364          * For all the tags in the remote_refs_list,
365          * add them to the list of refs to be fetched
366          */
367         for_each_string_list_item(remote_ref_item, &remote_refs_list) {
368                 const char *refname = remote_ref_item->string;
369
370                 item = hashmap_get_from_hash(&remote_refs, strhash(refname), refname);
371                 if (!item)
372                         BUG("unseen remote ref?");
373
374                 /* Unless we have already decided to ignore this item... */
375                 if (!is_null_oid(&item->oid)) {
376                         struct ref *rm = alloc_ref(item->refname);
377                         rm->peer_ref = alloc_ref(item->refname);
378                         oidcpy(&rm->old_oid, &item->oid);
379                         **tail = rm;
380                         *tail = &rm->next;
381                 }
382         }
383         hashmap_free(&remote_refs, 1);
384         string_list_clear(&remote_refs_list, 0);
385 }
386
387 static struct ref *get_ref_map(struct remote *remote,
388                                const struct ref *remote_refs,
389                                struct refspec *rs,
390                                int tags, int *autotags)
391 {
392         int i;
393         struct ref *rm;
394         struct ref *ref_map = NULL;
395         struct ref **tail = &ref_map;
396
397         /* opportunistically-updated references: */
398         struct ref *orefs = NULL, **oref_tail = &orefs;
399
400         struct hashmap existing_refs;
401
402         if (rs->nr) {
403                 struct refspec *fetch_refspec;
404
405                 for (i = 0; i < rs->nr; i++) {
406                         get_fetch_map(remote_refs, &rs->items[i], &tail, 0);
407                         if (rs->items[i].dst && rs->items[i].dst[0])
408                                 *autotags = 1;
409                 }
410                 /* Merge everything on the command line (but not --tags) */
411                 for (rm = ref_map; rm; rm = rm->next)
412                         rm->fetch_head_status = FETCH_HEAD_MERGE;
413
414                 /*
415                  * For any refs that we happen to be fetching via
416                  * command-line arguments, the destination ref might
417                  * have been missing or have been different than the
418                  * remote-tracking ref that would be derived from the
419                  * configured refspec.  In these cases, we want to
420                  * take the opportunity to update their configured
421                  * remote-tracking reference.  However, we do not want
422                  * to mention these entries in FETCH_HEAD at all, as
423                  * they would simply be duplicates of existing
424                  * entries, so we set them FETCH_HEAD_IGNORE below.
425                  *
426                  * We compute these entries now, based only on the
427                  * refspecs specified on the command line.  But we add
428                  * them to the list following the refspecs resulting
429                  * from the tags option so that one of the latter,
430                  * which has FETCH_HEAD_NOT_FOR_MERGE, is not removed
431                  * by ref_remove_duplicates() in favor of one of these
432                  * opportunistic entries with FETCH_HEAD_IGNORE.
433                  */
434                 if (refmap.nr)
435                         fetch_refspec = &refmap;
436                 else
437                         fetch_refspec = &remote->fetch;
438
439                 for (i = 0; i < fetch_refspec->nr; i++)
440                         get_fetch_map(ref_map, &fetch_refspec->items[i], &oref_tail, 1);
441         } else if (refmap.nr) {
442                 die("--refmap option is only meaningful with command-line refspec(s).");
443         } else {
444                 /* Use the defaults */
445                 struct branch *branch = branch_get(NULL);
446                 int has_merge = branch_has_merge_config(branch);
447                 if (remote &&
448                     (remote->fetch.nr ||
449                      /* Note: has_merge implies non-NULL branch->remote_name */
450                      (has_merge && !strcmp(branch->remote_name, remote->name)))) {
451                         for (i = 0; i < remote->fetch.nr; i++) {
452                                 get_fetch_map(remote_refs, &remote->fetch.items[i], &tail, 0);
453                                 if (remote->fetch.items[i].dst &&
454                                     remote->fetch.items[i].dst[0])
455                                         *autotags = 1;
456                                 if (!i && !has_merge && ref_map &&
457                                     !remote->fetch.items[0].pattern)
458                                         ref_map->fetch_head_status = FETCH_HEAD_MERGE;
459                         }
460                         /*
461                          * if the remote we're fetching from is the same
462                          * as given in branch.<name>.remote, we add the
463                          * ref given in branch.<name>.merge, too.
464                          *
465                          * Note: has_merge implies non-NULL branch->remote_name
466                          */
467                         if (has_merge &&
468                             !strcmp(branch->remote_name, remote->name))
469                                 add_merge_config(&ref_map, remote_refs, branch, &tail);
470                 } else {
471                         ref_map = get_remote_ref(remote_refs, "HEAD");
472                         if (!ref_map)
473                                 die(_("Couldn't find remote ref HEAD"));
474                         ref_map->fetch_head_status = FETCH_HEAD_MERGE;
475                         tail = &ref_map->next;
476                 }
477         }
478
479         if (tags == TAGS_SET)
480                 /* also fetch all tags */
481                 get_fetch_map(remote_refs, tag_refspec, &tail, 0);
482         else if (tags == TAGS_DEFAULT && *autotags)
483                 find_non_local_tags(remote_refs, &ref_map, &tail);
484
485         /* Now append any refs to be updated opportunistically: */
486         *tail = orefs;
487         for (rm = orefs; rm; rm = rm->next) {
488                 rm->fetch_head_status = FETCH_HEAD_IGNORE;
489                 tail = &rm->next;
490         }
491
492         ref_map = ref_remove_duplicates(ref_map);
493
494         refname_hash_init(&existing_refs);
495         for_each_ref(add_one_refname, &existing_refs);
496
497         for (rm = ref_map; rm; rm = rm->next) {
498                 if (rm->peer_ref) {
499                         const char *refname = rm->peer_ref->name;
500                         struct refname_hash_entry *peer_item;
501
502                         peer_item = hashmap_get_from_hash(&existing_refs,
503                                                           strhash(refname),
504                                                           refname);
505                         if (peer_item) {
506                                 struct object_id *old_oid = &peer_item->oid;
507                                 oidcpy(&rm->peer_ref->old_oid, old_oid);
508                         }
509                 }
510         }
511         hashmap_free(&existing_refs, 1);
512
513         return ref_map;
514 }
515
516 #define STORE_REF_ERROR_OTHER 1
517 #define STORE_REF_ERROR_DF_CONFLICT 2
518
519 static int s_update_ref(const char *action,
520                         struct ref *ref,
521                         int check_old)
522 {
523         char *msg;
524         char *rla = getenv("GIT_REFLOG_ACTION");
525         struct ref_transaction *transaction;
526         struct strbuf err = STRBUF_INIT;
527         int ret, df_conflict = 0;
528
529         if (dry_run)
530                 return 0;
531         if (!rla)
532                 rla = default_rla.buf;
533         msg = xstrfmt("%s: %s", rla, action);
534
535         transaction = ref_transaction_begin(&err);
536         if (!transaction ||
537             ref_transaction_update(transaction, ref->name,
538                                    &ref->new_oid,
539                                    check_old ? &ref->old_oid : NULL,
540                                    0, msg, &err))
541                 goto fail;
542
543         ret = ref_transaction_commit(transaction, &err);
544         if (ret) {
545                 df_conflict = (ret == TRANSACTION_NAME_CONFLICT);
546                 goto fail;
547         }
548
549         ref_transaction_free(transaction);
550         strbuf_release(&err);
551         free(msg);
552         return 0;
553 fail:
554         ref_transaction_free(transaction);
555         error("%s", err.buf);
556         strbuf_release(&err);
557         free(msg);
558         return df_conflict ? STORE_REF_ERROR_DF_CONFLICT
559                            : STORE_REF_ERROR_OTHER;
560 }
561
562 static int refcol_width = 10;
563 static int compact_format;
564
565 static void adjust_refcol_width(const struct ref *ref)
566 {
567         int max, rlen, llen, len;
568
569         /* uptodate lines are only shown on high verbosity level */
570         if (!verbosity && oideq(&ref->peer_ref->old_oid, &ref->old_oid))
571                 return;
572
573         max    = term_columns();
574         rlen   = utf8_strwidth(prettify_refname(ref->name));
575
576         llen   = utf8_strwidth(prettify_refname(ref->peer_ref->name));
577
578         /*
579          * rough estimation to see if the output line is too long and
580          * should not be counted (we can't do precise calculation
581          * anyway because we don't know if the error explanation part
582          * will be printed in update_local_ref)
583          */
584         if (compact_format) {
585                 llen = 0;
586                 max = max * 2 / 3;
587         }
588         len = 21 /* flag and summary */ + rlen + 4 /* -> */ + llen;
589         if (len >= max)
590                 return;
591
592         /*
593          * Not precise calculation for compact mode because '*' can
594          * appear on the left hand side of '->' and shrink the column
595          * back.
596          */
597         if (refcol_width < rlen)
598                 refcol_width = rlen;
599 }
600
601 static void prepare_format_display(struct ref *ref_map)
602 {
603         struct ref *rm;
604         const char *format = "full";
605
606         git_config_get_string_const("fetch.output", &format);
607         if (!strcasecmp(format, "full"))
608                 compact_format = 0;
609         else if (!strcasecmp(format, "compact"))
610                 compact_format = 1;
611         else
612                 die(_("configuration fetch.output contains invalid value %s"),
613                     format);
614
615         for (rm = ref_map; rm; rm = rm->next) {
616                 if (rm->status == REF_STATUS_REJECT_SHALLOW ||
617                     !rm->peer_ref ||
618                     !strcmp(rm->name, "HEAD"))
619                         continue;
620
621                 adjust_refcol_width(rm);
622         }
623 }
624
625 static void print_remote_to_local(struct strbuf *display,
626                                   const char *remote, const char *local)
627 {
628         strbuf_addf(display, "%-*s -> %s", refcol_width, remote, local);
629 }
630
631 static int find_and_replace(struct strbuf *haystack,
632                             const char *needle,
633                             const char *placeholder)
634 {
635         const char *p = strstr(haystack->buf, needle);
636         int plen, nlen;
637
638         if (!p)
639                 return 0;
640
641         if (p > haystack->buf && p[-1] != '/')
642                 return 0;
643
644         plen = strlen(p);
645         nlen = strlen(needle);
646         if (plen > nlen && p[nlen] != '/')
647                 return 0;
648
649         strbuf_splice(haystack, p - haystack->buf, nlen,
650                       placeholder, strlen(placeholder));
651         return 1;
652 }
653
654 static void print_compact(struct strbuf *display,
655                           const char *remote, const char *local)
656 {
657         struct strbuf r = STRBUF_INIT;
658         struct strbuf l = STRBUF_INIT;
659
660         if (!strcmp(remote, local)) {
661                 strbuf_addf(display, "%-*s -> *", refcol_width, remote);
662                 return;
663         }
664
665         strbuf_addstr(&r, remote);
666         strbuf_addstr(&l, local);
667
668         if (!find_and_replace(&r, local, "*"))
669                 find_and_replace(&l, remote, "*");
670         print_remote_to_local(display, r.buf, l.buf);
671
672         strbuf_release(&r);
673         strbuf_release(&l);
674 }
675
676 static void format_display(struct strbuf *display, char code,
677                            const char *summary, const char *error,
678                            const char *remote, const char *local,
679                            int summary_width)
680 {
681         int width = (summary_width + strlen(summary) - gettext_width(summary));
682
683         strbuf_addf(display, "%c %-*s ", code, width, summary);
684         if (!compact_format)
685                 print_remote_to_local(display, remote, local);
686         else
687                 print_compact(display, remote, local);
688         if (error)
689                 strbuf_addf(display, "  (%s)", error);
690 }
691
692 static int update_local_ref(struct ref *ref,
693                             const char *remote,
694                             const struct ref *remote_ref,
695                             struct strbuf *display,
696                             int summary_width)
697 {
698         struct commit *current = NULL, *updated;
699         enum object_type type;
700         struct branch *current_branch = branch_get(NULL);
701         const char *pretty_ref = prettify_refname(ref->name);
702
703         type = oid_object_info(the_repository, &ref->new_oid, NULL);
704         if (type < 0)
705                 die(_("object %s not found"), oid_to_hex(&ref->new_oid));
706
707         if (oideq(&ref->old_oid, &ref->new_oid)) {
708                 if (verbosity > 0)
709                         format_display(display, '=', _("[up to date]"), NULL,
710                                        remote, pretty_ref, summary_width);
711                 return 0;
712         }
713
714         if (current_branch &&
715             !strcmp(ref->name, current_branch->name) &&
716             !(update_head_ok || is_bare_repository()) &&
717             !is_null_oid(&ref->old_oid)) {
718                 /*
719                  * If this is the head, and it's not okay to update
720                  * the head, and the old value of the head isn't empty...
721                  */
722                 format_display(display, '!', _("[rejected]"),
723                                _("can't fetch in current branch"),
724                                remote, pretty_ref, summary_width);
725                 return 1;
726         }
727
728         if (!is_null_oid(&ref->old_oid) &&
729             starts_with(ref->name, "refs/tags/")) {
730                 if (force || ref->force) {
731                         int r;
732                         r = s_update_ref("updating tag", ref, 0);
733                         format_display(display, r ? '!' : 't', _("[tag update]"),
734                                        r ? _("unable to update local ref") : NULL,
735                                        remote, pretty_ref, summary_width);
736                         return r;
737                 } else {
738                         format_display(display, '!', _("[rejected]"), _("would clobber existing tag"),
739                                        remote, pretty_ref, summary_width);
740                         return 1;
741                 }
742         }
743
744         current = lookup_commit_reference_gently(the_repository,
745                                                  &ref->old_oid, 1);
746         updated = lookup_commit_reference_gently(the_repository,
747                                                  &ref->new_oid, 1);
748         if (!current || !updated) {
749                 const char *msg;
750                 const char *what;
751                 int r;
752                 /*
753                  * Nicely describe the new ref we're fetching.
754                  * Base this on the remote's ref name, as it's
755                  * more likely to follow a standard layout.
756                  */
757                 const char *name = remote_ref ? remote_ref->name : "";
758                 if (starts_with(name, "refs/tags/")) {
759                         msg = "storing tag";
760                         what = _("[new tag]");
761                 } else if (starts_with(name, "refs/heads/")) {
762                         msg = "storing head";
763                         what = _("[new branch]");
764                 } else {
765                         msg = "storing ref";
766                         what = _("[new ref]");
767                 }
768
769                 if ((recurse_submodules != RECURSE_SUBMODULES_OFF) &&
770                     (recurse_submodules != RECURSE_SUBMODULES_ON))
771                         check_for_new_submodule_commits(&ref->new_oid);
772                 r = s_update_ref(msg, ref, 0);
773                 format_display(display, r ? '!' : '*', what,
774                                r ? _("unable to update local ref") : NULL,
775                                remote, pretty_ref, summary_width);
776                 return r;
777         }
778
779         if (in_merge_bases(current, updated)) {
780                 struct strbuf quickref = STRBUF_INIT;
781                 int r;
782                 strbuf_add_unique_abbrev(&quickref, &current->object.oid, DEFAULT_ABBREV);
783                 strbuf_addstr(&quickref, "..");
784                 strbuf_add_unique_abbrev(&quickref, &ref->new_oid, DEFAULT_ABBREV);
785                 if ((recurse_submodules != RECURSE_SUBMODULES_OFF) &&
786                     (recurse_submodules != RECURSE_SUBMODULES_ON))
787                         check_for_new_submodule_commits(&ref->new_oid);
788                 r = s_update_ref("fast-forward", ref, 1);
789                 format_display(display, r ? '!' : ' ', quickref.buf,
790                                r ? _("unable to update local ref") : NULL,
791                                remote, pretty_ref, summary_width);
792                 strbuf_release(&quickref);
793                 return r;
794         } else if (force || ref->force) {
795                 struct strbuf quickref = STRBUF_INIT;
796                 int r;
797                 strbuf_add_unique_abbrev(&quickref, &current->object.oid, DEFAULT_ABBREV);
798                 strbuf_addstr(&quickref, "...");
799                 strbuf_add_unique_abbrev(&quickref, &ref->new_oid, DEFAULT_ABBREV);
800                 if ((recurse_submodules != RECURSE_SUBMODULES_OFF) &&
801                     (recurse_submodules != RECURSE_SUBMODULES_ON))
802                         check_for_new_submodule_commits(&ref->new_oid);
803                 r = s_update_ref("forced-update", ref, 1);
804                 format_display(display, r ? '!' : '+', quickref.buf,
805                                r ? _("unable to update local ref") : _("forced update"),
806                                remote, pretty_ref, summary_width);
807                 strbuf_release(&quickref);
808                 return r;
809         } else {
810                 format_display(display, '!', _("[rejected]"), _("non-fast-forward"),
811                                remote, pretty_ref, summary_width);
812                 return 1;
813         }
814 }
815
816 static int iterate_ref_map(void *cb_data, struct object_id *oid)
817 {
818         struct ref **rm = cb_data;
819         struct ref *ref = *rm;
820
821         while (ref && ref->status == REF_STATUS_REJECT_SHALLOW)
822                 ref = ref->next;
823         if (!ref)
824                 return -1; /* end of the list */
825         *rm = ref->next;
826         oidcpy(oid, &ref->old_oid);
827         return 0;
828 }
829
830 static int store_updated_refs(const char *raw_url, const char *remote_name,
831                               int connectivity_checked, struct ref *ref_map)
832 {
833         FILE *fp;
834         struct commit *commit;
835         int url_len, i, rc = 0;
836         struct strbuf note = STRBUF_INIT;
837         const char *what, *kind;
838         struct ref *rm;
839         char *url;
840         const char *filename = dry_run ? "/dev/null" : git_path_fetch_head(the_repository);
841         int want_status;
842         int summary_width = transport_summary_width(ref_map);
843
844         fp = fopen(filename, "a");
845         if (!fp)
846                 return error_errno(_("cannot open %s"), filename);
847
848         if (raw_url)
849                 url = transport_anonymize_url(raw_url);
850         else
851                 url = xstrdup("foreign");
852
853         if (!connectivity_checked) {
854                 rm = ref_map;
855                 if (check_connected(iterate_ref_map, &rm, NULL)) {
856                         rc = error(_("%s did not send all necessary objects\n"), url);
857                         goto abort;
858                 }
859         }
860
861         prepare_format_display(ref_map);
862
863         /*
864          * We do a pass for each fetch_head_status type in their enum order, so
865          * merged entries are written before not-for-merge. That lets readers
866          * use FETCH_HEAD as a refname to refer to the ref to be merged.
867          */
868         for (want_status = FETCH_HEAD_MERGE;
869              want_status <= FETCH_HEAD_IGNORE;
870              want_status++) {
871                 for (rm = ref_map; rm; rm = rm->next) {
872                         struct ref *ref = NULL;
873                         const char *merge_status_marker = "";
874
875                         if (rm->status == REF_STATUS_REJECT_SHALLOW) {
876                                 if (want_status == FETCH_HEAD_MERGE)
877                                         warning(_("reject %s because shallow roots are not allowed to be updated"),
878                                                 rm->peer_ref ? rm->peer_ref->name : rm->name);
879                                 continue;
880                         }
881
882                         commit = lookup_commit_reference_gently(the_repository,
883                                                                 &rm->old_oid,
884                                                                 1);
885                         if (!commit)
886                                 rm->fetch_head_status = FETCH_HEAD_NOT_FOR_MERGE;
887
888                         if (rm->fetch_head_status != want_status)
889                                 continue;
890
891                         if (rm->peer_ref) {
892                                 ref = alloc_ref(rm->peer_ref->name);
893                                 oidcpy(&ref->old_oid, &rm->peer_ref->old_oid);
894                                 oidcpy(&ref->new_oid, &rm->old_oid);
895                                 ref->force = rm->peer_ref->force;
896                         }
897
898
899                         if (!strcmp(rm->name, "HEAD")) {
900                                 kind = "";
901                                 what = "";
902                         }
903                         else if (starts_with(rm->name, "refs/heads/")) {
904                                 kind = "branch";
905                                 what = rm->name + 11;
906                         }
907                         else if (starts_with(rm->name, "refs/tags/")) {
908                                 kind = "tag";
909                                 what = rm->name + 10;
910                         }
911                         else if (starts_with(rm->name, "refs/remotes/")) {
912                                 kind = "remote-tracking branch";
913                                 what = rm->name + 13;
914                         }
915                         else {
916                                 kind = "";
917                                 what = rm->name;
918                         }
919
920                         url_len = strlen(url);
921                         for (i = url_len - 1; url[i] == '/' && 0 <= i; i--)
922                                 ;
923                         url_len = i + 1;
924                         if (4 < i && !strncmp(".git", url + i - 3, 4))
925                                 url_len = i - 3;
926
927                         strbuf_reset(&note);
928                         if (*what) {
929                                 if (*kind)
930                                         strbuf_addf(&note, "%s ", kind);
931                                 strbuf_addf(&note, "'%s' of ", what);
932                         }
933                         switch (rm->fetch_head_status) {
934                         case FETCH_HEAD_NOT_FOR_MERGE:
935                                 merge_status_marker = "not-for-merge";
936                                 /* fall-through */
937                         case FETCH_HEAD_MERGE:
938                                 fprintf(fp, "%s\t%s\t%s",
939                                         oid_to_hex(&rm->old_oid),
940                                         merge_status_marker,
941                                         note.buf);
942                                 for (i = 0; i < url_len; ++i)
943                                         if ('\n' == url[i])
944                                                 fputs("\\n", fp);
945                                         else
946                                                 fputc(url[i], fp);
947                                 fputc('\n', fp);
948                                 break;
949                         default:
950                                 /* do not write anything to FETCH_HEAD */
951                                 break;
952                         }
953
954                         strbuf_reset(&note);
955                         if (ref) {
956                                 rc |= update_local_ref(ref, what, rm, &note,
957                                                        summary_width);
958                                 free(ref);
959                         } else
960                                 format_display(&note, '*',
961                                                *kind ? kind : "branch", NULL,
962                                                *what ? what : "HEAD",
963                                                "FETCH_HEAD", summary_width);
964                         if (note.len) {
965                                 if (verbosity >= 0 && !shown_url) {
966                                         fprintf(stderr, _("From %.*s\n"),
967                                                         url_len, url);
968                                         shown_url = 1;
969                                 }
970                                 if (verbosity >= 0)
971                                         fprintf(stderr, " %s\n", note.buf);
972                         }
973                 }
974         }
975
976         if (rc & STORE_REF_ERROR_DF_CONFLICT)
977                 error(_("some local refs could not be updated; try running\n"
978                       " 'git remote prune %s' to remove any old, conflicting "
979                       "branches"), remote_name);
980
981  abort:
982         strbuf_release(&note);
983         free(url);
984         fclose(fp);
985         return rc;
986 }
987
988 /*
989  * We would want to bypass the object transfer altogether if
990  * everything we are going to fetch already exists and is connected
991  * locally.
992  */
993 static int quickfetch(struct ref *ref_map)
994 {
995         struct ref *rm = ref_map;
996         struct check_connected_options opt = CHECK_CONNECTED_INIT;
997
998         /*
999          * If we are deepening a shallow clone we already have these
1000          * objects reachable.  Running rev-list here will return with
1001          * a good (0) exit status and we'll bypass the fetch that we
1002          * really need to perform.  Claiming failure now will ensure
1003          * we perform the network exchange to deepen our history.
1004          */
1005         if (deepen)
1006                 return -1;
1007         opt.quiet = 1;
1008         return check_connected(iterate_ref_map, &rm, &opt);
1009 }
1010
1011 static int fetch_refs(struct transport *transport, struct ref *ref_map)
1012 {
1013         int ret = quickfetch(ref_map);
1014         if (ret)
1015                 ret = transport_fetch_refs(transport, ref_map);
1016         if (!ret)
1017                 /*
1018                  * Keep the new pack's ".keep" file around to allow the caller
1019                  * time to update refs to reference the new objects.
1020                  */
1021                 return 0;
1022         transport_unlock_pack(transport);
1023         return ret;
1024 }
1025
1026 /* Update local refs based on the ref values fetched from a remote */
1027 static int consume_refs(struct transport *transport, struct ref *ref_map)
1028 {
1029         int connectivity_checked = transport->smart_options
1030                 ? transport->smart_options->connectivity_checked : 0;
1031         int ret = store_updated_refs(transport->url,
1032                                      transport->remote->name,
1033                                      connectivity_checked,
1034                                      ref_map);
1035         transport_unlock_pack(transport);
1036         return ret;
1037 }
1038
1039 static int prune_refs(struct refspec *rs, struct ref *ref_map,
1040                       const char *raw_url)
1041 {
1042         int url_len, i, result = 0;
1043         struct ref *ref, *stale_refs = get_stale_heads(rs, ref_map);
1044         char *url;
1045         int summary_width = transport_summary_width(stale_refs);
1046         const char *dangling_msg = dry_run
1047                 ? _("   (%s will become dangling)")
1048                 : _("   (%s has become dangling)");
1049
1050         if (raw_url)
1051                 url = transport_anonymize_url(raw_url);
1052         else
1053                 url = xstrdup("foreign");
1054
1055         url_len = strlen(url);
1056         for (i = url_len - 1; url[i] == '/' && 0 <= i; i--)
1057                 ;
1058
1059         url_len = i + 1;
1060         if (4 < i && !strncmp(".git", url + i - 3, 4))
1061                 url_len = i - 3;
1062
1063         if (!dry_run) {
1064                 struct string_list refnames = STRING_LIST_INIT_NODUP;
1065
1066                 for (ref = stale_refs; ref; ref = ref->next)
1067                         string_list_append(&refnames, ref->name);
1068
1069                 result = delete_refs("fetch: prune", &refnames, 0);
1070                 string_list_clear(&refnames, 0);
1071         }
1072
1073         if (verbosity >= 0) {
1074                 for (ref = stale_refs; ref; ref = ref->next) {
1075                         struct strbuf sb = STRBUF_INIT;
1076                         if (!shown_url) {
1077                                 fprintf(stderr, _("From %.*s\n"), url_len, url);
1078                                 shown_url = 1;
1079                         }
1080                         format_display(&sb, '-', _("[deleted]"), NULL,
1081                                        _("(none)"), prettify_refname(ref->name),
1082                                        summary_width);
1083                         fprintf(stderr, " %s\n",sb.buf);
1084                         strbuf_release(&sb);
1085                         warn_dangling_symref(stderr, dangling_msg, ref->name);
1086                 }
1087         }
1088
1089         free(url);
1090         free_refs(stale_refs);
1091         return result;
1092 }
1093
1094 static void check_not_current_branch(struct ref *ref_map)
1095 {
1096         struct branch *current_branch = branch_get(NULL);
1097
1098         if (is_bare_repository() || !current_branch)
1099                 return;
1100
1101         for (; ref_map; ref_map = ref_map->next)
1102                 if (ref_map->peer_ref && !strcmp(current_branch->refname,
1103                                         ref_map->peer_ref->name))
1104                         die(_("Refusing to fetch into current branch %s "
1105                             "of non-bare repository"), current_branch->refname);
1106 }
1107
1108 static int truncate_fetch_head(void)
1109 {
1110         const char *filename = git_path_fetch_head(the_repository);
1111         FILE *fp = fopen_for_writing(filename);
1112
1113         if (!fp)
1114                 return error_errno(_("cannot open %s"), filename);
1115         fclose(fp);
1116         return 0;
1117 }
1118
1119 static void set_option(struct transport *transport, const char *name, const char *value)
1120 {
1121         int r = transport_set_option(transport, name, value);
1122         if (r < 0)
1123                 die(_("Option \"%s\" value \"%s\" is not valid for %s"),
1124                     name, value, transport->url);
1125         if (r > 0)
1126                 warning(_("Option \"%s\" is ignored for %s\n"),
1127                         name, transport->url);
1128 }
1129
1130
1131 static int add_oid(const char *refname, const struct object_id *oid, int flags,
1132                    void *cb_data)
1133 {
1134         struct oid_array *oids = cb_data;
1135
1136         oid_array_append(oids, oid);
1137         return 0;
1138 }
1139
1140 static void add_negotiation_tips(struct git_transport_options *smart_options)
1141 {
1142         struct oid_array *oids = xcalloc(1, sizeof(*oids));
1143         int i;
1144
1145         for (i = 0; i < negotiation_tip.nr; i++) {
1146                 const char *s = negotiation_tip.items[i].string;
1147                 int old_nr;
1148                 if (!has_glob_specials(s)) {
1149                         struct object_id oid;
1150                         if (get_oid(s, &oid))
1151                                 die("%s is not a valid object", s);
1152                         oid_array_append(oids, &oid);
1153                         continue;
1154                 }
1155                 old_nr = oids->nr;
1156                 for_each_glob_ref(add_oid, s, oids);
1157                 if (old_nr == oids->nr)
1158                         warning("Ignoring --negotiation-tip=%s because it does not match any refs",
1159                                 s);
1160         }
1161         smart_options->negotiation_tips = oids;
1162 }
1163
1164 static struct transport *prepare_transport(struct remote *remote, int deepen)
1165 {
1166         struct transport *transport;
1167         transport = transport_get(remote, NULL);
1168         transport_set_verbosity(transport, verbosity, progress);
1169         transport->family = family;
1170         if (upload_pack)
1171                 set_option(transport, TRANS_OPT_UPLOADPACK, upload_pack);
1172         if (keep)
1173                 set_option(transport, TRANS_OPT_KEEP, "yes");
1174         if (depth)
1175                 set_option(transport, TRANS_OPT_DEPTH, depth);
1176         if (deepen && deepen_since)
1177                 set_option(transport, TRANS_OPT_DEEPEN_SINCE, deepen_since);
1178         if (deepen && deepen_not.nr)
1179                 set_option(transport, TRANS_OPT_DEEPEN_NOT,
1180                            (const char *)&deepen_not);
1181         if (deepen_relative)
1182                 set_option(transport, TRANS_OPT_DEEPEN_RELATIVE, "yes");
1183         if (update_shallow)
1184                 set_option(transport, TRANS_OPT_UPDATE_SHALLOW, "yes");
1185         if (filter_options.choice) {
1186                 set_option(transport, TRANS_OPT_LIST_OBJECTS_FILTER,
1187                            filter_options.filter_spec);
1188                 set_option(transport, TRANS_OPT_FROM_PROMISOR, "1");
1189         }
1190         if (negotiation_tip.nr) {
1191                 if (transport->smart_options)
1192                         add_negotiation_tips(transport->smart_options);
1193                 else
1194                         warning("Ignoring --negotiation-tip because the protocol does not support it.");
1195         }
1196         return transport;
1197 }
1198
1199 static void backfill_tags(struct transport *transport, struct ref *ref_map)
1200 {
1201         int cannot_reuse;
1202
1203         /*
1204          * Once we have set TRANS_OPT_DEEPEN_SINCE, we can't unset it
1205          * when remote helper is used (setting it to an empty string
1206          * is not unsetting). We could extend the remote helper
1207          * protocol for that, but for now, just force a new connection
1208          * without deepen-since. Similar story for deepen-not.
1209          */
1210         cannot_reuse = transport->cannot_reuse ||
1211                 deepen_since || deepen_not.nr;
1212         if (cannot_reuse) {
1213                 gsecondary = prepare_transport(transport->remote, 0);
1214                 transport = gsecondary;
1215         }
1216
1217         transport_set_option(transport, TRANS_OPT_FOLLOWTAGS, NULL);
1218         transport_set_option(transport, TRANS_OPT_DEPTH, "0");
1219         transport_set_option(transport, TRANS_OPT_DEEPEN_RELATIVE, NULL);
1220         if (!fetch_refs(transport, ref_map))
1221                 consume_refs(transport, ref_map);
1222
1223         if (gsecondary) {
1224                 transport_disconnect(gsecondary);
1225                 gsecondary = NULL;
1226         }
1227 }
1228
1229 static int do_fetch(struct transport *transport,
1230                     struct refspec *rs)
1231 {
1232         struct ref *ref_map;
1233         int autotags = (transport->remote->fetch_tags == 1);
1234         int retcode = 0;
1235         const struct ref *remote_refs;
1236         struct argv_array ref_prefixes = ARGV_ARRAY_INIT;
1237
1238         if (tags == TAGS_DEFAULT) {
1239                 if (transport->remote->fetch_tags == 2)
1240                         tags = TAGS_SET;
1241                 if (transport->remote->fetch_tags == -1)
1242                         tags = TAGS_UNSET;
1243         }
1244
1245         /* if not appending, truncate FETCH_HEAD */
1246         if (!append && !dry_run) {
1247                 retcode = truncate_fetch_head();
1248                 if (retcode)
1249                         goto cleanup;
1250         }
1251
1252         if (rs->nr)
1253                 refspec_ref_prefixes(rs, &ref_prefixes);
1254         else if (transport->remote && transport->remote->fetch.nr)
1255                 refspec_ref_prefixes(&transport->remote->fetch, &ref_prefixes);
1256
1257         if (ref_prefixes.argc &&
1258             (tags == TAGS_SET || (tags == TAGS_DEFAULT))) {
1259                 argv_array_push(&ref_prefixes, "refs/tags/");
1260         }
1261
1262         remote_refs = transport_get_remote_refs(transport, &ref_prefixes);
1263         argv_array_clear(&ref_prefixes);
1264
1265         ref_map = get_ref_map(transport->remote, remote_refs, rs,
1266                               tags, &autotags);
1267         if (!update_head_ok)
1268                 check_not_current_branch(ref_map);
1269
1270         if (tags == TAGS_DEFAULT && autotags)
1271                 transport_set_option(transport, TRANS_OPT_FOLLOWTAGS, "1");
1272         if (prune) {
1273                 /*
1274                  * We only prune based on refspecs specified
1275                  * explicitly (via command line or configuration); we
1276                  * don't care whether --tags was specified.
1277                  */
1278                 if (rs->nr) {
1279                         prune_refs(rs, ref_map, transport->url);
1280                 } else {
1281                         prune_refs(&transport->remote->fetch,
1282                                    ref_map,
1283                                    transport->url);
1284                 }
1285         }
1286         if (fetch_refs(transport, ref_map) || consume_refs(transport, ref_map)) {
1287                 free_refs(ref_map);
1288                 retcode = 1;
1289                 goto cleanup;
1290         }
1291         free_refs(ref_map);
1292
1293         /* if neither --no-tags nor --tags was specified, do automated tag
1294          * following ... */
1295         if (tags == TAGS_DEFAULT && autotags) {
1296                 struct ref **tail = &ref_map;
1297                 ref_map = NULL;
1298                 find_non_local_tags(remote_refs, &ref_map, &tail);
1299                 if (ref_map)
1300                         backfill_tags(transport, ref_map);
1301                 free_refs(ref_map);
1302         }
1303
1304  cleanup:
1305         return retcode;
1306 }
1307
1308 static int get_one_remote_for_fetch(struct remote *remote, void *priv)
1309 {
1310         struct string_list *list = priv;
1311         if (!remote->skip_default_update)
1312                 string_list_append(list, remote->name);
1313         return 0;
1314 }
1315
1316 struct remote_group_data {
1317         const char *name;
1318         struct string_list *list;
1319 };
1320
1321 static int get_remote_group(const char *key, const char *value, void *priv)
1322 {
1323         struct remote_group_data *g = priv;
1324
1325         if (skip_prefix(key, "remotes.", &key) && !strcmp(key, g->name)) {
1326                 /* split list by white space */
1327                 while (*value) {
1328                         size_t wordlen = strcspn(value, " \t\n");
1329
1330                         if (wordlen >= 1)
1331                                 string_list_append_nodup(g->list,
1332                                                    xstrndup(value, wordlen));
1333                         value += wordlen + (value[wordlen] != '\0');
1334                 }
1335         }
1336
1337         return 0;
1338 }
1339
1340 static int add_remote_or_group(const char *name, struct string_list *list)
1341 {
1342         int prev_nr = list->nr;
1343         struct remote_group_data g;
1344         g.name = name; g.list = list;
1345
1346         git_config(get_remote_group, &g);
1347         if (list->nr == prev_nr) {
1348                 struct remote *remote = remote_get(name);
1349                 if (!remote_is_configured(remote, 0))
1350                         return 0;
1351                 string_list_append(list, remote->name);
1352         }
1353         return 1;
1354 }
1355
1356 static void add_options_to_argv(struct argv_array *argv)
1357 {
1358         if (dry_run)
1359                 argv_array_push(argv, "--dry-run");
1360         if (prune != -1)
1361                 argv_array_push(argv, prune ? "--prune" : "--no-prune");
1362         if (prune_tags != -1)
1363                 argv_array_push(argv, prune_tags ? "--prune-tags" : "--no-prune-tags");
1364         if (update_head_ok)
1365                 argv_array_push(argv, "--update-head-ok");
1366         if (force)
1367                 argv_array_push(argv, "--force");
1368         if (keep)
1369                 argv_array_push(argv, "--keep");
1370         if (recurse_submodules == RECURSE_SUBMODULES_ON)
1371                 argv_array_push(argv, "--recurse-submodules");
1372         else if (recurse_submodules == RECURSE_SUBMODULES_ON_DEMAND)
1373                 argv_array_push(argv, "--recurse-submodules=on-demand");
1374         if (tags == TAGS_SET)
1375                 argv_array_push(argv, "--tags");
1376         else if (tags == TAGS_UNSET)
1377                 argv_array_push(argv, "--no-tags");
1378         if (verbosity >= 2)
1379                 argv_array_push(argv, "-v");
1380         if (verbosity >= 1)
1381                 argv_array_push(argv, "-v");
1382         else if (verbosity < 0)
1383                 argv_array_push(argv, "-q");
1384
1385 }
1386
1387 static int fetch_multiple(struct string_list *list)
1388 {
1389         int i, result = 0;
1390         struct argv_array argv = ARGV_ARRAY_INIT;
1391
1392         if (!append && !dry_run) {
1393                 int errcode = truncate_fetch_head();
1394                 if (errcode)
1395                         return errcode;
1396         }
1397
1398         argv_array_pushl(&argv, "fetch", "--append", NULL);
1399         add_options_to_argv(&argv);
1400
1401         for (i = 0; i < list->nr; i++) {
1402                 const char *name = list->items[i].string;
1403                 argv_array_push(&argv, name);
1404                 if (verbosity >= 0)
1405                         printf(_("Fetching %s\n"), name);
1406                 if (run_command_v_opt(argv.argv, RUN_GIT_CMD)) {
1407                         error(_("Could not fetch %s"), name);
1408                         result = 1;
1409                 }
1410                 argv_array_pop(&argv);
1411         }
1412
1413         argv_array_clear(&argv);
1414         return result;
1415 }
1416
1417 /*
1418  * Fetching from the promisor remote should use the given filter-spec
1419  * or inherit the default filter-spec from the config.
1420  */
1421 static inline void fetch_one_setup_partial(struct remote *remote)
1422 {
1423         /*
1424          * Explicit --no-filter argument overrides everything, regardless
1425          * of any prior partial clones and fetches.
1426          */
1427         if (filter_options.no_filter)
1428                 return;
1429
1430         /*
1431          * If no prior partial clone/fetch and the current fetch DID NOT
1432          * request a partial-fetch, do a normal fetch.
1433          */
1434         if (!repository_format_partial_clone && !filter_options.choice)
1435                 return;
1436
1437         /*
1438          * If this is the FIRST partial-fetch request, we enable partial
1439          * on this repo and remember the given filter-spec as the default
1440          * for subsequent fetches to this remote.
1441          */
1442         if (!repository_format_partial_clone && filter_options.choice) {
1443                 partial_clone_register(remote->name, &filter_options);
1444                 return;
1445         }
1446
1447         /*
1448          * We are currently limited to only ONE promisor remote and only
1449          * allow partial-fetches from the promisor remote.
1450          */
1451         if (strcmp(remote->name, repository_format_partial_clone)) {
1452                 if (filter_options.choice)
1453                         die(_("--filter can only be used with the remote configured in core.partialClone"));
1454                 return;
1455         }
1456
1457         /*
1458          * Do a partial-fetch from the promisor remote using either the
1459          * explicitly given filter-spec or inherit the filter-spec from
1460          * the config.
1461          */
1462         if (!filter_options.choice)
1463                 partial_clone_get_default_filter_spec(&filter_options);
1464         return;
1465 }
1466
1467 static int fetch_one(struct remote *remote, int argc, const char **argv, int prune_tags_ok)
1468 {
1469         struct refspec rs = REFSPEC_INIT_FETCH;
1470         int i;
1471         int exit_code;
1472         int maybe_prune_tags;
1473         int remote_via_config = remote_is_configured(remote, 0);
1474
1475         if (!remote)
1476                 die(_("No remote repository specified.  Please, specify either a URL or a\n"
1477                     "remote name from which new revisions should be fetched."));
1478
1479         gtransport = prepare_transport(remote, 1);
1480
1481         if (prune < 0) {
1482                 /* no command line request */
1483                 if (0 <= remote->prune)
1484                         prune = remote->prune;
1485                 else if (0 <= fetch_prune_config)
1486                         prune = fetch_prune_config;
1487                 else
1488                         prune = PRUNE_BY_DEFAULT;
1489         }
1490
1491         if (prune_tags < 0) {
1492                 /* no command line request */
1493                 if (0 <= remote->prune_tags)
1494                         prune_tags = remote->prune_tags;
1495                 else if (0 <= fetch_prune_tags_config)
1496                         prune_tags = fetch_prune_tags_config;
1497                 else
1498                         prune_tags = PRUNE_TAGS_BY_DEFAULT;
1499         }
1500
1501         maybe_prune_tags = prune_tags_ok && prune_tags;
1502         if (maybe_prune_tags && remote_via_config)
1503                 refspec_append(&remote->fetch, TAG_REFSPEC);
1504
1505         if (maybe_prune_tags && (argc || !remote_via_config))
1506                 refspec_append(&rs, TAG_REFSPEC);
1507
1508         for (i = 0; i < argc; i++) {
1509                 if (!strcmp(argv[i], "tag")) {
1510                         char *tag;
1511                         i++;
1512                         if (i >= argc)
1513                                 die(_("You need to specify a tag name."));
1514
1515                         tag = xstrfmt("refs/tags/%s:refs/tags/%s",
1516                                       argv[i], argv[i]);
1517                         refspec_append(&rs, tag);
1518                         free(tag);
1519                 } else {
1520                         refspec_append(&rs, argv[i]);
1521                 }
1522         }
1523
1524         if (server_options.nr)
1525                 gtransport->server_options = &server_options;
1526
1527         sigchain_push_common(unlock_pack_on_signal);
1528         atexit(unlock_pack);
1529         exit_code = do_fetch(gtransport, &rs);
1530         refspec_clear(&rs);
1531         transport_disconnect(gtransport);
1532         gtransport = NULL;
1533         return exit_code;
1534 }
1535
1536 int cmd_fetch(int argc, const char **argv, const char *prefix)
1537 {
1538         int i;
1539         struct string_list list = STRING_LIST_INIT_DUP;
1540         struct remote *remote = NULL;
1541         int result = 0;
1542         int prune_tags_ok = 1;
1543         struct argv_array argv_gc_auto = ARGV_ARRAY_INIT;
1544
1545         packet_trace_identity("fetch");
1546
1547         fetch_if_missing = 0;
1548
1549         /* Record the command line for the reflog */
1550         strbuf_addstr(&default_rla, "fetch");
1551         for (i = 1; i < argc; i++)
1552                 strbuf_addf(&default_rla, " %s", argv[i]);
1553
1554         fetch_config_from_gitmodules(&max_children, &recurse_submodules);
1555         git_config(git_fetch_config, NULL);
1556
1557         argc = parse_options(argc, argv, prefix,
1558                              builtin_fetch_options, builtin_fetch_usage, 0);
1559
1560         if (deepen_relative) {
1561                 if (deepen_relative < 0)
1562                         die(_("Negative depth in --deepen is not supported"));
1563                 if (depth)
1564                         die(_("--deepen and --depth are mutually exclusive"));
1565                 depth = xstrfmt("%d", deepen_relative);
1566         }
1567         if (unshallow) {
1568                 if (depth)
1569                         die(_("--depth and --unshallow cannot be used together"));
1570                 else if (!is_repository_shallow(the_repository))
1571                         die(_("--unshallow on a complete repository does not make sense"));
1572                 else
1573                         depth = xstrfmt("%d", INFINITE_DEPTH);
1574         }
1575
1576         /* no need to be strict, transport_set_option() will validate it again */
1577         if (depth && atoi(depth) < 1)
1578                 die(_("depth %s is not a positive number"), depth);
1579         if (depth || deepen_since || deepen_not.nr)
1580                 deepen = 1;
1581
1582         if (filter_options.choice && !repository_format_partial_clone)
1583                 die("--filter can only be used when extensions.partialClone is set");
1584
1585         if (all) {
1586                 if (argc == 1)
1587                         die(_("fetch --all does not take a repository argument"));
1588                 else if (argc > 1)
1589                         die(_("fetch --all does not make sense with refspecs"));
1590                 (void) for_each_remote(get_one_remote_for_fetch, &list);
1591         } else if (argc == 0) {
1592                 /* No arguments -- use default remote */
1593                 remote = remote_get(NULL);
1594         } else if (multiple) {
1595                 /* All arguments are assumed to be remotes or groups */
1596                 for (i = 0; i < argc; i++)
1597                         if (!add_remote_or_group(argv[i], &list))
1598                                 die(_("No such remote or remote group: %s"), argv[i]);
1599         } else {
1600                 /* Single remote or group */
1601                 (void) add_remote_or_group(argv[0], &list);
1602                 if (list.nr > 1) {
1603                         /* More than one remote */
1604                         if (argc > 1)
1605                                 die(_("Fetching a group and specifying refspecs does not make sense"));
1606                 } else {
1607                         /* Zero or one remotes */
1608                         remote = remote_get(argv[0]);
1609                         prune_tags_ok = (argc == 1);
1610                         argc--;
1611                         argv++;
1612                 }
1613         }
1614
1615         if (remote) {
1616                 if (filter_options.choice || repository_format_partial_clone)
1617                         fetch_one_setup_partial(remote);
1618                 result = fetch_one(remote, argc, argv, prune_tags_ok);
1619         } else {
1620                 if (filter_options.choice)
1621                         die(_("--filter can only be used with the remote configured in core.partialClone"));
1622                 /* TODO should this also die if we have a previous partial-clone? */
1623                 result = fetch_multiple(&list);
1624         }
1625
1626         if (!result && (recurse_submodules != RECURSE_SUBMODULES_OFF)) {
1627                 struct argv_array options = ARGV_ARRAY_INIT;
1628
1629                 add_options_to_argv(&options);
1630                 result = fetch_populated_submodules(the_repository,
1631                                                     &options,
1632                                                     submodule_prefix,
1633                                                     recurse_submodules,
1634                                                     recurse_submodules_default,
1635                                                     verbosity < 0,
1636                                                     max_children);
1637                 argv_array_clear(&options);
1638         }
1639
1640         string_list_clear(&list, 0);
1641
1642         close_all_packs(the_repository->objects);
1643
1644         argv_array_pushl(&argv_gc_auto, "gc", "--auto", NULL);
1645         if (verbosity < 0)
1646                 argv_array_push(&argv_gc_auto, "--quiet");
1647         run_command_v_opt(argv_gc_auto.argv, RUN_GIT_CMD);
1648         argv_array_clear(&argv_gc_auto);
1649
1650         return result;
1651 }