Merge branch 'kd/t0028-octal-del-is-377-not-777'
[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         BUG_ON_OPT_NEG(unset);
102
103         /*
104          * "git fetch --refmap='' origin foo"
105          * can be used to tell the command not to store anywhere
106          */
107         refspec_append(&refmap, arg);
108
109         return 0;
110 }
111
112 static struct option builtin_fetch_options[] = {
113         OPT__VERBOSITY(&verbosity),
114         OPT_BOOL(0, "all", &all,
115                  N_("fetch from all remotes")),
116         OPT_BOOL('a', "append", &append,
117                  N_("append to .git/FETCH_HEAD instead of overwriting")),
118         OPT_STRING(0, "upload-pack", &upload_pack, N_("path"),
119                    N_("path to upload pack on remote end")),
120         OPT__FORCE(&force, N_("force overwrite of local reference"), 0),
121         OPT_BOOL('m', "multiple", &multiple,
122                  N_("fetch from multiple remotes")),
123         OPT_SET_INT('t', "tags", &tags,
124                     N_("fetch all tags and associated objects"), TAGS_SET),
125         OPT_SET_INT('n', NULL, &tags,
126                     N_("do not fetch all tags (--no-tags)"), TAGS_UNSET),
127         OPT_INTEGER('j', "jobs", &max_children,
128                     N_("number of submodules fetched in parallel")),
129         OPT_BOOL('p', "prune", &prune,
130                  N_("prune remote-tracking branches no longer on remote")),
131         OPT_BOOL('P', "prune-tags", &prune_tags,
132                  N_("prune local tags no longer on remote and clobber changed tags")),
133         { OPTION_CALLBACK, 0, "recurse-submodules", &recurse_submodules, N_("on-demand"),
134                     N_("control recursive fetching of submodules"),
135                     PARSE_OPT_OPTARG, option_fetch_parse_recurse_submodules },
136         OPT_BOOL(0, "dry-run", &dry_run,
137                  N_("dry run")),
138         OPT_BOOL('k', "keep", &keep, N_("keep downloaded pack")),
139         OPT_BOOL('u', "update-head-ok", &update_head_ok,
140                     N_("allow updating of HEAD ref")),
141         OPT_BOOL(0, "progress", &progress, N_("force progress reporting")),
142         OPT_STRING(0, "depth", &depth, N_("depth"),
143                    N_("deepen history of shallow clone")),
144         OPT_STRING(0, "shallow-since", &deepen_since, N_("time"),
145                    N_("deepen history of shallow repository based on time")),
146         OPT_STRING_LIST(0, "shallow-exclude", &deepen_not, N_("revision"),
147                         N_("deepen history of shallow clone, excluding rev")),
148         OPT_INTEGER(0, "deepen", &deepen_relative,
149                     N_("deepen history of shallow clone")),
150         OPT_SET_INT_F(0, "unshallow", &unshallow,
151                       N_("convert to a complete repository"),
152                       1, PARSE_OPT_NONEG),
153         { OPTION_STRING, 0, "submodule-prefix", &submodule_prefix, N_("dir"),
154                    N_("prepend this to submodule path output"), PARSE_OPT_HIDDEN },
155         { OPTION_CALLBACK, 0, "recurse-submodules-default",
156                    &recurse_submodules_default, N_("on-demand"),
157                    N_("default for recursive fetching of submodules "
158                       "(lower priority than config files)"),
159                    PARSE_OPT_HIDDEN, option_fetch_parse_recurse_submodules },
160         OPT_BOOL(0, "update-shallow", &update_shallow,
161                  N_("accept refs that update .git/shallow")),
162         { OPTION_CALLBACK, 0, "refmap", NULL, N_("refmap"),
163           N_("specify fetch refmap"), PARSE_OPT_NONEG, parse_refmap_arg },
164         OPT_STRING_LIST('o', "server-option", &server_options, N_("server-specific"), N_("option to transmit")),
165         OPT_SET_INT('4', "ipv4", &family, N_("use IPv4 addresses only"),
166                         TRANSPORT_FAMILY_IPV4),
167         OPT_SET_INT('6', "ipv6", &family, N_("use IPv6 addresses only"),
168                         TRANSPORT_FAMILY_IPV6),
169         OPT_STRING_LIST(0, "negotiation-tip", &negotiation_tip, N_("revision"),
170                         N_("report that we have only objects reachable from this object")),
171         OPT_PARSE_LIST_OBJECTS_FILTER(&filter_options),
172         OPT_END()
173 };
174
175 static void unlock_pack(void)
176 {
177         if (gtransport)
178                 transport_unlock_pack(gtransport);
179         if (gsecondary)
180                 transport_unlock_pack(gsecondary);
181 }
182
183 static void unlock_pack_on_signal(int signo)
184 {
185         unlock_pack();
186         sigchain_pop(signo);
187         raise(signo);
188 }
189
190 static void add_merge_config(struct ref **head,
191                            const struct ref *remote_refs,
192                            struct branch *branch,
193                            struct ref ***tail)
194 {
195         int i;
196
197         for (i = 0; i < branch->merge_nr; i++) {
198                 struct ref *rm, **old_tail = *tail;
199                 struct refspec_item refspec;
200
201                 for (rm = *head; rm; rm = rm->next) {
202                         if (branch_merge_matches(branch, i, rm->name)) {
203                                 rm->fetch_head_status = FETCH_HEAD_MERGE;
204                                 break;
205                         }
206                 }
207                 if (rm)
208                         continue;
209
210                 /*
211                  * Not fetched to a remote-tracking branch?  We need to fetch
212                  * it anyway to allow this branch's "branch.$name.merge"
213                  * to be honored by 'git pull', but we do not have to
214                  * fail if branch.$name.merge is misconfigured to point
215                  * at a nonexisting branch.  If we were indeed called by
216                  * 'git pull', it will notice the misconfiguration because
217                  * there is no entry in the resulting FETCH_HEAD marked
218                  * for merging.
219                  */
220                 memset(&refspec, 0, sizeof(refspec));
221                 refspec.src = branch->merge[i]->src;
222                 get_fetch_map(remote_refs, &refspec, tail, 1);
223                 for (rm = *old_tail; rm; rm = rm->next)
224                         rm->fetch_head_status = FETCH_HEAD_MERGE;
225         }
226 }
227
228 static int will_fetch(struct ref **head, const unsigned char *sha1)
229 {
230         struct ref *rm = *head;
231         while (rm) {
232                 if (hasheq(rm->old_oid.hash, sha1))
233                         return 1;
234                 rm = rm->next;
235         }
236         return 0;
237 }
238
239 struct refname_hash_entry {
240         struct hashmap_entry ent; /* must be the first member */
241         struct object_id oid;
242         char refname[FLEX_ARRAY];
243 };
244
245 static int refname_hash_entry_cmp(const void *hashmap_cmp_fn_data,
246                                   const void *e1_,
247                                   const void *e2_,
248                                   const void *keydata)
249 {
250         const struct refname_hash_entry *e1 = e1_;
251         const struct refname_hash_entry *e2 = e2_;
252
253         return strcmp(e1->refname, keydata ? keydata : e2->refname);
254 }
255
256 static struct refname_hash_entry *refname_hash_add(struct hashmap *map,
257                                                    const char *refname,
258                                                    const struct object_id *oid)
259 {
260         struct refname_hash_entry *ent;
261         size_t len = strlen(refname);
262
263         FLEX_ALLOC_MEM(ent, refname, refname, len);
264         hashmap_entry_init(ent, strhash(refname));
265         oidcpy(&ent->oid, oid);
266         hashmap_add(map, ent);
267         return ent;
268 }
269
270 static int add_one_refname(const char *refname,
271                            const struct object_id *oid,
272                            int flag, void *cbdata)
273 {
274         struct hashmap *refname_map = cbdata;
275
276         (void) refname_hash_add(refname_map, refname, oid);
277         return 0;
278 }
279
280 static void refname_hash_init(struct hashmap *map)
281 {
282         hashmap_init(map, refname_hash_entry_cmp, NULL, 0);
283 }
284
285 static int refname_hash_exists(struct hashmap *map, const char *refname)
286 {
287         return !!hashmap_get_from_hash(map, strhash(refname), refname);
288 }
289
290 static void find_non_local_tags(const struct ref *refs,
291                                 struct ref **head,
292                                 struct ref ***tail)
293 {
294         struct hashmap existing_refs;
295         struct hashmap remote_refs;
296         struct string_list remote_refs_list = STRING_LIST_INIT_NODUP;
297         struct string_list_item *remote_ref_item;
298         const struct ref *ref;
299         struct refname_hash_entry *item = NULL;
300
301         refname_hash_init(&existing_refs);
302         refname_hash_init(&remote_refs);
303
304         for_each_ref(add_one_refname, &existing_refs);
305         for (ref = refs; ref; ref = ref->next) {
306                 if (!starts_with(ref->name, "refs/tags/"))
307                         continue;
308
309                 /*
310                  * The peeled ref always follows the matching base
311                  * ref, so if we see a peeled ref that we don't want
312                  * to fetch then we can mark the ref entry in the list
313                  * as one to ignore by setting util to NULL.
314                  */
315                 if (ends_with(ref->name, "^{}")) {
316                         if (item &&
317                             !has_object_file_with_flags(&ref->old_oid,
318                                                         OBJECT_INFO_QUICK) &&
319                             !will_fetch(head, ref->old_oid.hash) &&
320                             !has_object_file_with_flags(&item->oid, OBJECT_INFO_QUICK) &&
321                             !will_fetch(head, item->oid.hash))
322                                 oidclr(&item->oid);
323                         item = NULL;
324                         continue;
325                 }
326
327                 /*
328                  * If item is non-NULL here, then we previously saw a
329                  * ref not followed by a peeled reference, so we need
330                  * to check if it is a lightweight tag that we want to
331                  * fetch.
332                  */
333                 if (item &&
334                     !has_object_file_with_flags(&item->oid, OBJECT_INFO_QUICK) &&
335                     !will_fetch(head, item->oid.hash))
336                         oidclr(&item->oid);
337
338                 item = NULL;
339
340                 /* skip duplicates and refs that we already have */
341                 if (refname_hash_exists(&remote_refs, ref->name) ||
342                     refname_hash_exists(&existing_refs, ref->name))
343                         continue;
344
345                 item = refname_hash_add(&remote_refs, ref->name, &ref->old_oid);
346                 string_list_insert(&remote_refs_list, ref->name);
347         }
348         hashmap_free(&existing_refs, 1);
349
350         /*
351          * We may have a final lightweight tag that needs to be
352          * checked to see if it needs fetching.
353          */
354         if (item &&
355             !has_object_file_with_flags(&item->oid, OBJECT_INFO_QUICK) &&
356             !will_fetch(head, item->oid.hash))
357                 oidclr(&item->oid);
358
359         /*
360          * For all the tags in the remote_refs_list,
361          * add them to the list of refs to be fetched
362          */
363         for_each_string_list_item(remote_ref_item, &remote_refs_list) {
364                 const char *refname = remote_ref_item->string;
365
366                 item = hashmap_get_from_hash(&remote_refs, strhash(refname), refname);
367                 if (!item)
368                         BUG("unseen remote ref?");
369
370                 /* Unless we have already decided to ignore this item... */
371                 if (!is_null_oid(&item->oid)) {
372                         struct ref *rm = alloc_ref(item->refname);
373                         rm->peer_ref = alloc_ref(item->refname);
374                         oidcpy(&rm->old_oid, &item->oid);
375                         **tail = rm;
376                         *tail = &rm->next;
377                 }
378         }
379         hashmap_free(&remote_refs, 1);
380         string_list_clear(&remote_refs_list, 0);
381 }
382
383 static struct ref *get_ref_map(struct remote *remote,
384                                const struct ref *remote_refs,
385                                struct refspec *rs,
386                                int tags, int *autotags)
387 {
388         int i;
389         struct ref *rm;
390         struct ref *ref_map = NULL;
391         struct ref **tail = &ref_map;
392
393         /* opportunistically-updated references: */
394         struct ref *orefs = NULL, **oref_tail = &orefs;
395
396         struct hashmap existing_refs;
397
398         if (rs->nr) {
399                 struct refspec *fetch_refspec;
400
401                 for (i = 0; i < rs->nr; i++) {
402                         get_fetch_map(remote_refs, &rs->items[i], &tail, 0);
403                         if (rs->items[i].dst && rs->items[i].dst[0])
404                                 *autotags = 1;
405                 }
406                 /* Merge everything on the command line (but not --tags) */
407                 for (rm = ref_map; rm; rm = rm->next)
408                         rm->fetch_head_status = FETCH_HEAD_MERGE;
409
410                 /*
411                  * For any refs that we happen to be fetching via
412                  * command-line arguments, the destination ref might
413                  * have been missing or have been different than the
414                  * remote-tracking ref that would be derived from the
415                  * configured refspec.  In these cases, we want to
416                  * take the opportunity to update their configured
417                  * remote-tracking reference.  However, we do not want
418                  * to mention these entries in FETCH_HEAD at all, as
419                  * they would simply be duplicates of existing
420                  * entries, so we set them FETCH_HEAD_IGNORE below.
421                  *
422                  * We compute these entries now, based only on the
423                  * refspecs specified on the command line.  But we add
424                  * them to the list following the refspecs resulting
425                  * from the tags option so that one of the latter,
426                  * which has FETCH_HEAD_NOT_FOR_MERGE, is not removed
427                  * by ref_remove_duplicates() in favor of one of these
428                  * opportunistic entries with FETCH_HEAD_IGNORE.
429                  */
430                 if (refmap.nr)
431                         fetch_refspec = &refmap;
432                 else
433                         fetch_refspec = &remote->fetch;
434
435                 for (i = 0; i < fetch_refspec->nr; i++)
436                         get_fetch_map(ref_map, &fetch_refspec->items[i], &oref_tail, 1);
437         } else if (refmap.nr) {
438                 die("--refmap option is only meaningful with command-line refspec(s).");
439         } else {
440                 /* Use the defaults */
441                 struct branch *branch = branch_get(NULL);
442                 int has_merge = branch_has_merge_config(branch);
443                 if (remote &&
444                     (remote->fetch.nr ||
445                      /* Note: has_merge implies non-NULL branch->remote_name */
446                      (has_merge && !strcmp(branch->remote_name, remote->name)))) {
447                         for (i = 0; i < remote->fetch.nr; i++) {
448                                 get_fetch_map(remote_refs, &remote->fetch.items[i], &tail, 0);
449                                 if (remote->fetch.items[i].dst &&
450                                     remote->fetch.items[i].dst[0])
451                                         *autotags = 1;
452                                 if (!i && !has_merge && ref_map &&
453                                     !remote->fetch.items[0].pattern)
454                                         ref_map->fetch_head_status = FETCH_HEAD_MERGE;
455                         }
456                         /*
457                          * if the remote we're fetching from is the same
458                          * as given in branch.<name>.remote, we add the
459                          * ref given in branch.<name>.merge, too.
460                          *
461                          * Note: has_merge implies non-NULL branch->remote_name
462                          */
463                         if (has_merge &&
464                             !strcmp(branch->remote_name, remote->name))
465                                 add_merge_config(&ref_map, remote_refs, branch, &tail);
466                 } else {
467                         ref_map = get_remote_ref(remote_refs, "HEAD");
468                         if (!ref_map)
469                                 die(_("Couldn't find remote ref HEAD"));
470                         ref_map->fetch_head_status = FETCH_HEAD_MERGE;
471                         tail = &ref_map->next;
472                 }
473         }
474
475         if (tags == TAGS_SET)
476                 /* also fetch all tags */
477                 get_fetch_map(remote_refs, tag_refspec, &tail, 0);
478         else if (tags == TAGS_DEFAULT && *autotags)
479                 find_non_local_tags(remote_refs, &ref_map, &tail);
480
481         /* Now append any refs to be updated opportunistically: */
482         *tail = orefs;
483         for (rm = orefs; rm; rm = rm->next) {
484                 rm->fetch_head_status = FETCH_HEAD_IGNORE;
485                 tail = &rm->next;
486         }
487
488         ref_map = ref_remove_duplicates(ref_map);
489
490         refname_hash_init(&existing_refs);
491         for_each_ref(add_one_refname, &existing_refs);
492
493         for (rm = ref_map; rm; rm = rm->next) {
494                 if (rm->peer_ref) {
495                         const char *refname = rm->peer_ref->name;
496                         struct refname_hash_entry *peer_item;
497
498                         peer_item = hashmap_get_from_hash(&existing_refs,
499                                                           strhash(refname),
500                                                           refname);
501                         if (peer_item) {
502                                 struct object_id *old_oid = &peer_item->oid;
503                                 oidcpy(&rm->peer_ref->old_oid, old_oid);
504                         }
505                 }
506         }
507         hashmap_free(&existing_refs, 1);
508
509         return ref_map;
510 }
511
512 #define STORE_REF_ERROR_OTHER 1
513 #define STORE_REF_ERROR_DF_CONFLICT 2
514
515 static int s_update_ref(const char *action,
516                         struct ref *ref,
517                         int check_old)
518 {
519         char *msg;
520         char *rla = getenv("GIT_REFLOG_ACTION");
521         struct ref_transaction *transaction;
522         struct strbuf err = STRBUF_INIT;
523         int ret, df_conflict = 0;
524
525         if (dry_run)
526                 return 0;
527         if (!rla)
528                 rla = default_rla.buf;
529         msg = xstrfmt("%s: %s", rla, action);
530
531         transaction = ref_transaction_begin(&err);
532         if (!transaction ||
533             ref_transaction_update(transaction, ref->name,
534                                    &ref->new_oid,
535                                    check_old ? &ref->old_oid : NULL,
536                                    0, msg, &err))
537                 goto fail;
538
539         ret = ref_transaction_commit(transaction, &err);
540         if (ret) {
541                 df_conflict = (ret == TRANSACTION_NAME_CONFLICT);
542                 goto fail;
543         }
544
545         ref_transaction_free(transaction);
546         strbuf_release(&err);
547         free(msg);
548         return 0;
549 fail:
550         ref_transaction_free(transaction);
551         error("%s", err.buf);
552         strbuf_release(&err);
553         free(msg);
554         return df_conflict ? STORE_REF_ERROR_DF_CONFLICT
555                            : STORE_REF_ERROR_OTHER;
556 }
557
558 static int refcol_width = 10;
559 static int compact_format;
560
561 static void adjust_refcol_width(const struct ref *ref)
562 {
563         int max, rlen, llen, len;
564
565         /* uptodate lines are only shown on high verbosity level */
566         if (!verbosity && oideq(&ref->peer_ref->old_oid, &ref->old_oid))
567                 return;
568
569         max    = term_columns();
570         rlen   = utf8_strwidth(prettify_refname(ref->name));
571
572         llen   = utf8_strwidth(prettify_refname(ref->peer_ref->name));
573
574         /*
575          * rough estimation to see if the output line is too long and
576          * should not be counted (we can't do precise calculation
577          * anyway because we don't know if the error explanation part
578          * will be printed in update_local_ref)
579          */
580         if (compact_format) {
581                 llen = 0;
582                 max = max * 2 / 3;
583         }
584         len = 21 /* flag and summary */ + rlen + 4 /* -> */ + llen;
585         if (len >= max)
586                 return;
587
588         /*
589          * Not precise calculation for compact mode because '*' can
590          * appear on the left hand side of '->' and shrink the column
591          * back.
592          */
593         if (refcol_width < rlen)
594                 refcol_width = rlen;
595 }
596
597 static void prepare_format_display(struct ref *ref_map)
598 {
599         struct ref *rm;
600         const char *format = "full";
601
602         git_config_get_string_const("fetch.output", &format);
603         if (!strcasecmp(format, "full"))
604                 compact_format = 0;
605         else if (!strcasecmp(format, "compact"))
606                 compact_format = 1;
607         else
608                 die(_("configuration fetch.output contains invalid value %s"),
609                     format);
610
611         for (rm = ref_map; rm; rm = rm->next) {
612                 if (rm->status == REF_STATUS_REJECT_SHALLOW ||
613                     !rm->peer_ref ||
614                     !strcmp(rm->name, "HEAD"))
615                         continue;
616
617                 adjust_refcol_width(rm);
618         }
619 }
620
621 static void print_remote_to_local(struct strbuf *display,
622                                   const char *remote, const char *local)
623 {
624         strbuf_addf(display, "%-*s -> %s", refcol_width, remote, local);
625 }
626
627 static int find_and_replace(struct strbuf *haystack,
628                             const char *needle,
629                             const char *placeholder)
630 {
631         const char *p = NULL;
632         int plen, nlen;
633
634         nlen = strlen(needle);
635         if (ends_with(haystack->buf, needle))
636                 p = haystack->buf + haystack->len - nlen;
637         else
638                 p = strstr(haystack->buf, needle);
639         if (!p)
640                 return 0;
641
642         if (p > haystack->buf && p[-1] != '/')
643                 return 0;
644
645         plen = strlen(p);
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                 r = s_update_ref(msg, ref, 0);
770                 format_display(display, r ? '!' : '*', what,
771                                r ? _("unable to update local ref") : NULL,
772                                remote, pretty_ref, summary_width);
773                 return r;
774         }
775
776         if (in_merge_bases(current, updated)) {
777                 struct strbuf quickref = STRBUF_INIT;
778                 int r;
779                 strbuf_add_unique_abbrev(&quickref, &current->object.oid, DEFAULT_ABBREV);
780                 strbuf_addstr(&quickref, "..");
781                 strbuf_add_unique_abbrev(&quickref, &ref->new_oid, DEFAULT_ABBREV);
782                 r = s_update_ref("fast-forward", ref, 1);
783                 format_display(display, r ? '!' : ' ', quickref.buf,
784                                r ? _("unable to update local ref") : NULL,
785                                remote, pretty_ref, summary_width);
786                 strbuf_release(&quickref);
787                 return r;
788         } else if (force || ref->force) {
789                 struct strbuf quickref = STRBUF_INIT;
790                 int r;
791                 strbuf_add_unique_abbrev(&quickref, &current->object.oid, DEFAULT_ABBREV);
792                 strbuf_addstr(&quickref, "...");
793                 strbuf_add_unique_abbrev(&quickref, &ref->new_oid, DEFAULT_ABBREV);
794                 r = s_update_ref("forced-update", ref, 1);
795                 format_display(display, r ? '!' : '+', quickref.buf,
796                                r ? _("unable to update local ref") : _("forced update"),
797                                remote, pretty_ref, summary_width);
798                 strbuf_release(&quickref);
799                 return r;
800         } else {
801                 format_display(display, '!', _("[rejected]"), _("non-fast-forward"),
802                                remote, pretty_ref, summary_width);
803                 return 1;
804         }
805 }
806
807 static int iterate_ref_map(void *cb_data, struct object_id *oid)
808 {
809         struct ref **rm = cb_data;
810         struct ref *ref = *rm;
811
812         while (ref && ref->status == REF_STATUS_REJECT_SHALLOW)
813                 ref = ref->next;
814         if (!ref)
815                 return -1; /* end of the list */
816         *rm = ref->next;
817         oidcpy(oid, &ref->old_oid);
818         return 0;
819 }
820
821 static int store_updated_refs(const char *raw_url, const char *remote_name,
822                               int connectivity_checked, struct ref *ref_map)
823 {
824         FILE *fp;
825         struct commit *commit;
826         int url_len, i, rc = 0;
827         struct strbuf note = STRBUF_INIT;
828         const char *what, *kind;
829         struct ref *rm;
830         char *url;
831         const char *filename = dry_run ? "/dev/null" : git_path_fetch_head(the_repository);
832         int want_status;
833         int summary_width = transport_summary_width(ref_map);
834
835         fp = fopen(filename, "a");
836         if (!fp)
837                 return error_errno(_("cannot open %s"), filename);
838
839         if (raw_url)
840                 url = transport_anonymize_url(raw_url);
841         else
842                 url = xstrdup("foreign");
843
844         if (!connectivity_checked) {
845                 rm = ref_map;
846                 if (check_connected(iterate_ref_map, &rm, NULL)) {
847                         rc = error(_("%s did not send all necessary objects\n"), url);
848                         goto abort;
849                 }
850         }
851
852         prepare_format_display(ref_map);
853
854         /*
855          * We do a pass for each fetch_head_status type in their enum order, so
856          * merged entries are written before not-for-merge. That lets readers
857          * use FETCH_HEAD as a refname to refer to the ref to be merged.
858          */
859         for (want_status = FETCH_HEAD_MERGE;
860              want_status <= FETCH_HEAD_IGNORE;
861              want_status++) {
862                 for (rm = ref_map; rm; rm = rm->next) {
863                         struct ref *ref = NULL;
864                         const char *merge_status_marker = "";
865
866                         if (rm->status == REF_STATUS_REJECT_SHALLOW) {
867                                 if (want_status == FETCH_HEAD_MERGE)
868                                         warning(_("reject %s because shallow roots are not allowed to be updated"),
869                                                 rm->peer_ref ? rm->peer_ref->name : rm->name);
870                                 continue;
871                         }
872
873                         commit = lookup_commit_reference_gently(the_repository,
874                                                                 &rm->old_oid,
875                                                                 1);
876                         if (!commit)
877                                 rm->fetch_head_status = FETCH_HEAD_NOT_FOR_MERGE;
878
879                         if (rm->fetch_head_status != want_status)
880                                 continue;
881
882                         if (rm->peer_ref) {
883                                 ref = alloc_ref(rm->peer_ref->name);
884                                 oidcpy(&ref->old_oid, &rm->peer_ref->old_oid);
885                                 oidcpy(&ref->new_oid, &rm->old_oid);
886                                 ref->force = rm->peer_ref->force;
887                         }
888
889                         if (recurse_submodules != RECURSE_SUBMODULES_OFF)
890                                 check_for_new_submodule_commits(&rm->old_oid);
891
892                         if (!strcmp(rm->name, "HEAD")) {
893                                 kind = "";
894                                 what = "";
895                         }
896                         else if (starts_with(rm->name, "refs/heads/")) {
897                                 kind = "branch";
898                                 what = rm->name + 11;
899                         }
900                         else if (starts_with(rm->name, "refs/tags/")) {
901                                 kind = "tag";
902                                 what = rm->name + 10;
903                         }
904                         else if (starts_with(rm->name, "refs/remotes/")) {
905                                 kind = "remote-tracking branch";
906                                 what = rm->name + 13;
907                         }
908                         else {
909                                 kind = "";
910                                 what = rm->name;
911                         }
912
913                         url_len = strlen(url);
914                         for (i = url_len - 1; url[i] == '/' && 0 <= i; i--)
915                                 ;
916                         url_len = i + 1;
917                         if (4 < i && !strncmp(".git", url + i - 3, 4))
918                                 url_len = i - 3;
919
920                         strbuf_reset(&note);
921                         if (*what) {
922                                 if (*kind)
923                                         strbuf_addf(&note, "%s ", kind);
924                                 strbuf_addf(&note, "'%s' of ", what);
925                         }
926                         switch (rm->fetch_head_status) {
927                         case FETCH_HEAD_NOT_FOR_MERGE:
928                                 merge_status_marker = "not-for-merge";
929                                 /* fall-through */
930                         case FETCH_HEAD_MERGE:
931                                 fprintf(fp, "%s\t%s\t%s",
932                                         oid_to_hex(&rm->old_oid),
933                                         merge_status_marker,
934                                         note.buf);
935                                 for (i = 0; i < url_len; ++i)
936                                         if ('\n' == url[i])
937                                                 fputs("\\n", fp);
938                                         else
939                                                 fputc(url[i], fp);
940                                 fputc('\n', fp);
941                                 break;
942                         default:
943                                 /* do not write anything to FETCH_HEAD */
944                                 break;
945                         }
946
947                         strbuf_reset(&note);
948                         if (ref) {
949                                 rc |= update_local_ref(ref, what, rm, &note,
950                                                        summary_width);
951                                 free(ref);
952                         } else
953                                 format_display(&note, '*',
954                                                *kind ? kind : "branch", NULL,
955                                                *what ? what : "HEAD",
956                                                "FETCH_HEAD", summary_width);
957                         if (note.len) {
958                                 if (verbosity >= 0 && !shown_url) {
959                                         fprintf(stderr, _("From %.*s\n"),
960                                                         url_len, url);
961                                         shown_url = 1;
962                                 }
963                                 if (verbosity >= 0)
964                                         fprintf(stderr, " %s\n", note.buf);
965                         }
966                 }
967         }
968
969         if (rc & STORE_REF_ERROR_DF_CONFLICT)
970                 error(_("some local refs could not be updated; try running\n"
971                       " 'git remote prune %s' to remove any old, conflicting "
972                       "branches"), remote_name);
973
974  abort:
975         strbuf_release(&note);
976         free(url);
977         fclose(fp);
978         return rc;
979 }
980
981 /*
982  * We would want to bypass the object transfer altogether if
983  * everything we are going to fetch already exists and is connected
984  * locally.
985  */
986 static int check_exist_and_connected(struct ref *ref_map)
987 {
988         struct ref *rm = ref_map;
989         struct check_connected_options opt = CHECK_CONNECTED_INIT;
990         struct ref *r;
991
992         /*
993          * If we are deepening a shallow clone we already have these
994          * objects reachable.  Running rev-list here will return with
995          * a good (0) exit status and we'll bypass the fetch that we
996          * really need to perform.  Claiming failure now will ensure
997          * we perform the network exchange to deepen our history.
998          */
999         if (deepen)
1000                 return -1;
1001
1002         /*
1003          * check_connected() allows objects to merely be promised, but
1004          * we need all direct targets to exist.
1005          */
1006         for (r = rm; r; r = r->next) {
1007                 if (!has_object_file(&r->old_oid))
1008                         return -1;
1009         }
1010
1011         opt.quiet = 1;
1012         return check_connected(iterate_ref_map, &rm, &opt);
1013 }
1014
1015 static int fetch_refs(struct transport *transport, struct ref *ref_map)
1016 {
1017         int ret = check_exist_and_connected(ref_map);
1018         if (ret)
1019                 ret = transport_fetch_refs(transport, ref_map);
1020         if (!ret)
1021                 /*
1022                  * Keep the new pack's ".keep" file around to allow the caller
1023                  * time to update refs to reference the new objects.
1024                  */
1025                 return 0;
1026         transport_unlock_pack(transport);
1027         return ret;
1028 }
1029
1030 /* Update local refs based on the ref values fetched from a remote */
1031 static int consume_refs(struct transport *transport, struct ref *ref_map)
1032 {
1033         int connectivity_checked = transport->smart_options
1034                 ? transport->smart_options->connectivity_checked : 0;
1035         int ret = store_updated_refs(transport->url,
1036                                      transport->remote->name,
1037                                      connectivity_checked,
1038                                      ref_map);
1039         transport_unlock_pack(transport);
1040         return ret;
1041 }
1042
1043 static int prune_refs(struct refspec *rs, struct ref *ref_map,
1044                       const char *raw_url)
1045 {
1046         int url_len, i, result = 0;
1047         struct ref *ref, *stale_refs = get_stale_heads(rs, ref_map);
1048         char *url;
1049         int summary_width = transport_summary_width(stale_refs);
1050         const char *dangling_msg = dry_run
1051                 ? _("   (%s will become dangling)")
1052                 : _("   (%s has become dangling)");
1053
1054         if (raw_url)
1055                 url = transport_anonymize_url(raw_url);
1056         else
1057                 url = xstrdup("foreign");
1058
1059         url_len = strlen(url);
1060         for (i = url_len - 1; url[i] == '/' && 0 <= i; i--)
1061                 ;
1062
1063         url_len = i + 1;
1064         if (4 < i && !strncmp(".git", url + i - 3, 4))
1065                 url_len = i - 3;
1066
1067         if (!dry_run) {
1068                 struct string_list refnames = STRING_LIST_INIT_NODUP;
1069
1070                 for (ref = stale_refs; ref; ref = ref->next)
1071                         string_list_append(&refnames, ref->name);
1072
1073                 result = delete_refs("fetch: prune", &refnames, 0);
1074                 string_list_clear(&refnames, 0);
1075         }
1076
1077         if (verbosity >= 0) {
1078                 for (ref = stale_refs; ref; ref = ref->next) {
1079                         struct strbuf sb = STRBUF_INIT;
1080                         if (!shown_url) {
1081                                 fprintf(stderr, _("From %.*s\n"), url_len, url);
1082                                 shown_url = 1;
1083                         }
1084                         format_display(&sb, '-', _("[deleted]"), NULL,
1085                                        _("(none)"), prettify_refname(ref->name),
1086                                        summary_width);
1087                         fprintf(stderr, " %s\n",sb.buf);
1088                         strbuf_release(&sb);
1089                         warn_dangling_symref(stderr, dangling_msg, ref->name);
1090                 }
1091         }
1092
1093         free(url);
1094         free_refs(stale_refs);
1095         return result;
1096 }
1097
1098 static void check_not_current_branch(struct ref *ref_map)
1099 {
1100         struct branch *current_branch = branch_get(NULL);
1101
1102         if (is_bare_repository() || !current_branch)
1103                 return;
1104
1105         for (; ref_map; ref_map = ref_map->next)
1106                 if (ref_map->peer_ref && !strcmp(current_branch->refname,
1107                                         ref_map->peer_ref->name))
1108                         die(_("Refusing to fetch into current branch %s "
1109                             "of non-bare repository"), current_branch->refname);
1110 }
1111
1112 static int truncate_fetch_head(void)
1113 {
1114         const char *filename = git_path_fetch_head(the_repository);
1115         FILE *fp = fopen_for_writing(filename);
1116
1117         if (!fp)
1118                 return error_errno(_("cannot open %s"), filename);
1119         fclose(fp);
1120         return 0;
1121 }
1122
1123 static void set_option(struct transport *transport, const char *name, const char *value)
1124 {
1125         int r = transport_set_option(transport, name, value);
1126         if (r < 0)
1127                 die(_("Option \"%s\" value \"%s\" is not valid for %s"),
1128                     name, value, transport->url);
1129         if (r > 0)
1130                 warning(_("Option \"%s\" is ignored for %s\n"),
1131                         name, transport->url);
1132 }
1133
1134
1135 static int add_oid(const char *refname, const struct object_id *oid, int flags,
1136                    void *cb_data)
1137 {
1138         struct oid_array *oids = cb_data;
1139
1140         oid_array_append(oids, oid);
1141         return 0;
1142 }
1143
1144 static void add_negotiation_tips(struct git_transport_options *smart_options)
1145 {
1146         struct oid_array *oids = xcalloc(1, sizeof(*oids));
1147         int i;
1148
1149         for (i = 0; i < negotiation_tip.nr; i++) {
1150                 const char *s = negotiation_tip.items[i].string;
1151                 int old_nr;
1152                 if (!has_glob_specials(s)) {
1153                         struct object_id oid;
1154                         if (get_oid(s, &oid))
1155                                 die("%s is not a valid object", s);
1156                         oid_array_append(oids, &oid);
1157                         continue;
1158                 }
1159                 old_nr = oids->nr;
1160                 for_each_glob_ref(add_oid, s, oids);
1161                 if (old_nr == oids->nr)
1162                         warning("Ignoring --negotiation-tip=%s because it does not match any refs",
1163                                 s);
1164         }
1165         smart_options->negotiation_tips = oids;
1166 }
1167
1168 static struct transport *prepare_transport(struct remote *remote, int deepen)
1169 {
1170         struct transport *transport;
1171
1172         transport = transport_get(remote, NULL);
1173         transport_set_verbosity(transport, verbosity, progress);
1174         transport->family = family;
1175         if (upload_pack)
1176                 set_option(transport, TRANS_OPT_UPLOADPACK, upload_pack);
1177         if (keep)
1178                 set_option(transport, TRANS_OPT_KEEP, "yes");
1179         if (depth)
1180                 set_option(transport, TRANS_OPT_DEPTH, depth);
1181         if (deepen && deepen_since)
1182                 set_option(transport, TRANS_OPT_DEEPEN_SINCE, deepen_since);
1183         if (deepen && deepen_not.nr)
1184                 set_option(transport, TRANS_OPT_DEEPEN_NOT,
1185                            (const char *)&deepen_not);
1186         if (deepen_relative)
1187                 set_option(transport, TRANS_OPT_DEEPEN_RELATIVE, "yes");
1188         if (update_shallow)
1189                 set_option(transport, TRANS_OPT_UPDATE_SHALLOW, "yes");
1190         if (filter_options.choice) {
1191                 struct strbuf expanded_filter_spec = STRBUF_INIT;
1192                 expand_list_objects_filter_spec(&filter_options,
1193                                                 &expanded_filter_spec);
1194                 set_option(transport, TRANS_OPT_LIST_OBJECTS_FILTER,
1195                            expanded_filter_spec.buf);
1196                 set_option(transport, TRANS_OPT_FROM_PROMISOR, "1");
1197                 strbuf_release(&expanded_filter_spec);
1198         }
1199         if (negotiation_tip.nr) {
1200                 if (transport->smart_options)
1201                         add_negotiation_tips(transport->smart_options);
1202                 else
1203                         warning("Ignoring --negotiation-tip because the protocol does not support it.");
1204         }
1205         return transport;
1206 }
1207
1208 static void backfill_tags(struct transport *transport, struct ref *ref_map)
1209 {
1210         int cannot_reuse;
1211
1212         /*
1213          * Once we have set TRANS_OPT_DEEPEN_SINCE, we can't unset it
1214          * when remote helper is used (setting it to an empty string
1215          * is not unsetting). We could extend the remote helper
1216          * protocol for that, but for now, just force a new connection
1217          * without deepen-since. Similar story for deepen-not.
1218          */
1219         cannot_reuse = transport->cannot_reuse ||
1220                 deepen_since || deepen_not.nr;
1221         if (cannot_reuse) {
1222                 gsecondary = prepare_transport(transport->remote, 0);
1223                 transport = gsecondary;
1224         }
1225
1226         transport_set_option(transport, TRANS_OPT_FOLLOWTAGS, NULL);
1227         transport_set_option(transport, TRANS_OPT_DEPTH, "0");
1228         transport_set_option(transport, TRANS_OPT_DEEPEN_RELATIVE, NULL);
1229         if (!fetch_refs(transport, ref_map))
1230                 consume_refs(transport, ref_map);
1231
1232         if (gsecondary) {
1233                 transport_disconnect(gsecondary);
1234                 gsecondary = NULL;
1235         }
1236 }
1237
1238 static int do_fetch(struct transport *transport,
1239                     struct refspec *rs)
1240 {
1241         struct ref *ref_map;
1242         int autotags = (transport->remote->fetch_tags == 1);
1243         int retcode = 0;
1244         const struct ref *remote_refs;
1245         struct argv_array ref_prefixes = ARGV_ARRAY_INIT;
1246         int must_list_refs = 1;
1247
1248         if (tags == TAGS_DEFAULT) {
1249                 if (transport->remote->fetch_tags == 2)
1250                         tags = TAGS_SET;
1251                 if (transport->remote->fetch_tags == -1)
1252                         tags = TAGS_UNSET;
1253         }
1254
1255         /* if not appending, truncate FETCH_HEAD */
1256         if (!append && !dry_run) {
1257                 retcode = truncate_fetch_head();
1258                 if (retcode)
1259                         goto cleanup;
1260         }
1261
1262         if (rs->nr) {
1263                 int i;
1264
1265                 refspec_ref_prefixes(rs, &ref_prefixes);
1266
1267                 /*
1268                  * We can avoid listing refs if all of them are exact
1269                  * OIDs
1270                  */
1271                 must_list_refs = 0;
1272                 for (i = 0; i < rs->nr; i++) {
1273                         if (!rs->items[i].exact_sha1) {
1274                                 must_list_refs = 1;
1275                                 break;
1276                         }
1277                 }
1278         } else if (transport->remote && transport->remote->fetch.nr)
1279                 refspec_ref_prefixes(&transport->remote->fetch, &ref_prefixes);
1280
1281         if (tags == TAGS_SET || tags == TAGS_DEFAULT) {
1282                 must_list_refs = 1;
1283                 if (ref_prefixes.argc)
1284                         argv_array_push(&ref_prefixes, "refs/tags/");
1285         }
1286
1287         if (must_list_refs)
1288                 remote_refs = transport_get_remote_refs(transport, &ref_prefixes);
1289         else
1290                 remote_refs = NULL;
1291
1292         argv_array_clear(&ref_prefixes);
1293
1294         ref_map = get_ref_map(transport->remote, remote_refs, rs,
1295                               tags, &autotags);
1296         if (!update_head_ok)
1297                 check_not_current_branch(ref_map);
1298
1299         if (tags == TAGS_DEFAULT && autotags)
1300                 transport_set_option(transport, TRANS_OPT_FOLLOWTAGS, "1");
1301         if (prune) {
1302                 /*
1303                  * We only prune based on refspecs specified
1304                  * explicitly (via command line or configuration); we
1305                  * don't care whether --tags was specified.
1306                  */
1307                 if (rs->nr) {
1308                         prune_refs(rs, ref_map, transport->url);
1309                 } else {
1310                         prune_refs(&transport->remote->fetch,
1311                                    ref_map,
1312                                    transport->url);
1313                 }
1314         }
1315         if (fetch_refs(transport, ref_map) || consume_refs(transport, ref_map)) {
1316                 free_refs(ref_map);
1317                 retcode = 1;
1318                 goto cleanup;
1319         }
1320         free_refs(ref_map);
1321
1322         /* if neither --no-tags nor --tags was specified, do automated tag
1323          * following ... */
1324         if (tags == TAGS_DEFAULT && autotags) {
1325                 struct ref **tail = &ref_map;
1326                 ref_map = NULL;
1327                 find_non_local_tags(remote_refs, &ref_map, &tail);
1328                 if (ref_map)
1329                         backfill_tags(transport, ref_map);
1330                 free_refs(ref_map);
1331         }
1332
1333  cleanup:
1334         return retcode;
1335 }
1336
1337 static int get_one_remote_for_fetch(struct remote *remote, void *priv)
1338 {
1339         struct string_list *list = priv;
1340         if (!remote->skip_default_update)
1341                 string_list_append(list, remote->name);
1342         return 0;
1343 }
1344
1345 struct remote_group_data {
1346         const char *name;
1347         struct string_list *list;
1348 };
1349
1350 static int get_remote_group(const char *key, const char *value, void *priv)
1351 {
1352         struct remote_group_data *g = priv;
1353
1354         if (skip_prefix(key, "remotes.", &key) && !strcmp(key, g->name)) {
1355                 /* split list by white space */
1356                 while (*value) {
1357                         size_t wordlen = strcspn(value, " \t\n");
1358
1359                         if (wordlen >= 1)
1360                                 string_list_append_nodup(g->list,
1361                                                    xstrndup(value, wordlen));
1362                         value += wordlen + (value[wordlen] != '\0');
1363                 }
1364         }
1365
1366         return 0;
1367 }
1368
1369 static int add_remote_or_group(const char *name, struct string_list *list)
1370 {
1371         int prev_nr = list->nr;
1372         struct remote_group_data g;
1373         g.name = name; g.list = list;
1374
1375         git_config(get_remote_group, &g);
1376         if (list->nr == prev_nr) {
1377                 struct remote *remote = remote_get(name);
1378                 if (!remote_is_configured(remote, 0))
1379                         return 0;
1380                 string_list_append(list, remote->name);
1381         }
1382         return 1;
1383 }
1384
1385 static void add_options_to_argv(struct argv_array *argv)
1386 {
1387         if (dry_run)
1388                 argv_array_push(argv, "--dry-run");
1389         if (prune != -1)
1390                 argv_array_push(argv, prune ? "--prune" : "--no-prune");
1391         if (prune_tags != -1)
1392                 argv_array_push(argv, prune_tags ? "--prune-tags" : "--no-prune-tags");
1393         if (update_head_ok)
1394                 argv_array_push(argv, "--update-head-ok");
1395         if (force)
1396                 argv_array_push(argv, "--force");
1397         if (keep)
1398                 argv_array_push(argv, "--keep");
1399         if (recurse_submodules == RECURSE_SUBMODULES_ON)
1400                 argv_array_push(argv, "--recurse-submodules");
1401         else if (recurse_submodules == RECURSE_SUBMODULES_ON_DEMAND)
1402                 argv_array_push(argv, "--recurse-submodules=on-demand");
1403         if (tags == TAGS_SET)
1404                 argv_array_push(argv, "--tags");
1405         else if (tags == TAGS_UNSET)
1406                 argv_array_push(argv, "--no-tags");
1407         if (verbosity >= 2)
1408                 argv_array_push(argv, "-v");
1409         if (verbosity >= 1)
1410                 argv_array_push(argv, "-v");
1411         else if (verbosity < 0)
1412                 argv_array_push(argv, "-q");
1413
1414 }
1415
1416 static int fetch_multiple(struct string_list *list)
1417 {
1418         int i, result = 0;
1419         struct argv_array argv = ARGV_ARRAY_INIT;
1420
1421         if (!append && !dry_run) {
1422                 int errcode = truncate_fetch_head();
1423                 if (errcode)
1424                         return errcode;
1425         }
1426
1427         argv_array_pushl(&argv, "fetch", "--append", NULL);
1428         add_options_to_argv(&argv);
1429
1430         for (i = 0; i < list->nr; i++) {
1431                 const char *name = list->items[i].string;
1432                 argv_array_push(&argv, name);
1433                 if (verbosity >= 0)
1434                         printf(_("Fetching %s\n"), name);
1435                 if (run_command_v_opt(argv.argv, RUN_GIT_CMD)) {
1436                         error(_("Could not fetch %s"), name);
1437                         result = 1;
1438                 }
1439                 argv_array_pop(&argv);
1440         }
1441
1442         argv_array_clear(&argv);
1443         return result;
1444 }
1445
1446 /*
1447  * Fetching from the promisor remote should use the given filter-spec
1448  * or inherit the default filter-spec from the config.
1449  */
1450 static inline void fetch_one_setup_partial(struct remote *remote)
1451 {
1452         /*
1453          * Explicit --no-filter argument overrides everything, regardless
1454          * of any prior partial clones and fetches.
1455          */
1456         if (filter_options.no_filter)
1457                 return;
1458
1459         /*
1460          * If no prior partial clone/fetch and the current fetch DID NOT
1461          * request a partial-fetch, do a normal fetch.
1462          */
1463         if (!repository_format_partial_clone && !filter_options.choice)
1464                 return;
1465
1466         /*
1467          * If this is the FIRST partial-fetch request, we enable partial
1468          * on this repo and remember the given filter-spec as the default
1469          * for subsequent fetches to this remote.
1470          */
1471         if (!repository_format_partial_clone && filter_options.choice) {
1472                 partial_clone_register(remote->name, &filter_options);
1473                 return;
1474         }
1475
1476         /*
1477          * We are currently limited to only ONE promisor remote and only
1478          * allow partial-fetches from the promisor remote.
1479          */
1480         if (strcmp(remote->name, repository_format_partial_clone)) {
1481                 if (filter_options.choice)
1482                         die(_("--filter can only be used with the remote "
1483                               "configured in extensions.partialClone"));
1484                 return;
1485         }
1486
1487         /*
1488          * Do a partial-fetch from the promisor remote using either the
1489          * explicitly given filter-spec or inherit the filter-spec from
1490          * the config.
1491          */
1492         if (!filter_options.choice)
1493                 partial_clone_get_default_filter_spec(&filter_options);
1494         return;
1495 }
1496
1497 static int fetch_one(struct remote *remote, int argc, const char **argv, int prune_tags_ok)
1498 {
1499         struct refspec rs = REFSPEC_INIT_FETCH;
1500         int i;
1501         int exit_code;
1502         int maybe_prune_tags;
1503         int remote_via_config = remote_is_configured(remote, 0);
1504
1505         if (!remote)
1506                 die(_("No remote repository specified.  Please, specify either a URL or a\n"
1507                     "remote name from which new revisions should be fetched."));
1508
1509         gtransport = prepare_transport(remote, 1);
1510
1511         if (prune < 0) {
1512                 /* no command line request */
1513                 if (0 <= remote->prune)
1514                         prune = remote->prune;
1515                 else if (0 <= fetch_prune_config)
1516                         prune = fetch_prune_config;
1517                 else
1518                         prune = PRUNE_BY_DEFAULT;
1519         }
1520
1521         if (prune_tags < 0) {
1522                 /* no command line request */
1523                 if (0 <= remote->prune_tags)
1524                         prune_tags = remote->prune_tags;
1525                 else if (0 <= fetch_prune_tags_config)
1526                         prune_tags = fetch_prune_tags_config;
1527                 else
1528                         prune_tags = PRUNE_TAGS_BY_DEFAULT;
1529         }
1530
1531         maybe_prune_tags = prune_tags_ok && prune_tags;
1532         if (maybe_prune_tags && remote_via_config)
1533                 refspec_append(&remote->fetch, TAG_REFSPEC);
1534
1535         if (maybe_prune_tags && (argc || !remote_via_config))
1536                 refspec_append(&rs, TAG_REFSPEC);
1537
1538         for (i = 0; i < argc; i++) {
1539                 if (!strcmp(argv[i], "tag")) {
1540                         char *tag;
1541                         i++;
1542                         if (i >= argc)
1543                                 die(_("You need to specify a tag name."));
1544
1545                         tag = xstrfmt("refs/tags/%s:refs/tags/%s",
1546                                       argv[i], argv[i]);
1547                         refspec_append(&rs, tag);
1548                         free(tag);
1549                 } else {
1550                         refspec_append(&rs, argv[i]);
1551                 }
1552         }
1553
1554         if (server_options.nr)
1555                 gtransport->server_options = &server_options;
1556
1557         sigchain_push_common(unlock_pack_on_signal);
1558         atexit(unlock_pack);
1559         exit_code = do_fetch(gtransport, &rs);
1560         refspec_clear(&rs);
1561         transport_disconnect(gtransport);
1562         gtransport = NULL;
1563         return exit_code;
1564 }
1565
1566 int cmd_fetch(int argc, const char **argv, const char *prefix)
1567 {
1568         int i;
1569         struct string_list list = STRING_LIST_INIT_DUP;
1570         struct remote *remote = NULL;
1571         int result = 0;
1572         int prune_tags_ok = 1;
1573         struct argv_array argv_gc_auto = ARGV_ARRAY_INIT;
1574
1575         packet_trace_identity("fetch");
1576
1577         fetch_if_missing = 0;
1578
1579         /* Record the command line for the reflog */
1580         strbuf_addstr(&default_rla, "fetch");
1581         for (i = 1; i < argc; i++)
1582                 strbuf_addf(&default_rla, " %s", argv[i]);
1583
1584         fetch_config_from_gitmodules(&max_children, &recurse_submodules);
1585         git_config(git_fetch_config, NULL);
1586
1587         argc = parse_options(argc, argv, prefix,
1588                              builtin_fetch_options, builtin_fetch_usage, 0);
1589
1590         if (deepen_relative) {
1591                 if (deepen_relative < 0)
1592                         die(_("Negative depth in --deepen is not supported"));
1593                 if (depth)
1594                         die(_("--deepen and --depth are mutually exclusive"));
1595                 depth = xstrfmt("%d", deepen_relative);
1596         }
1597         if (unshallow) {
1598                 if (depth)
1599                         die(_("--depth and --unshallow cannot be used together"));
1600                 else if (!is_repository_shallow(the_repository))
1601                         die(_("--unshallow on a complete repository does not make sense"));
1602                 else
1603                         depth = xstrfmt("%d", INFINITE_DEPTH);
1604         }
1605
1606         /* no need to be strict, transport_set_option() will validate it again */
1607         if (depth && atoi(depth) < 1)
1608                 die(_("depth %s is not a positive number"), depth);
1609         if (depth || deepen_since || deepen_not.nr)
1610                 deepen = 1;
1611
1612         if (filter_options.choice && !repository_format_partial_clone)
1613                 die("--filter can only be used when extensions.partialClone is set");
1614
1615         if (all) {
1616                 if (argc == 1)
1617                         die(_("fetch --all does not take a repository argument"));
1618                 else if (argc > 1)
1619                         die(_("fetch --all does not make sense with refspecs"));
1620                 (void) for_each_remote(get_one_remote_for_fetch, &list);
1621         } else if (argc == 0) {
1622                 /* No arguments -- use default remote */
1623                 remote = remote_get(NULL);
1624         } else if (multiple) {
1625                 /* All arguments are assumed to be remotes or groups */
1626                 for (i = 0; i < argc; i++)
1627                         if (!add_remote_or_group(argv[i], &list))
1628                                 die(_("No such remote or remote group: %s"), argv[i]);
1629         } else {
1630                 /* Single remote or group */
1631                 (void) add_remote_or_group(argv[0], &list);
1632                 if (list.nr > 1) {
1633                         /* More than one remote */
1634                         if (argc > 1)
1635                                 die(_("Fetching a group and specifying refspecs does not make sense"));
1636                 } else {
1637                         /* Zero or one remotes */
1638                         remote = remote_get(argv[0]);
1639                         prune_tags_ok = (argc == 1);
1640                         argc--;
1641                         argv++;
1642                 }
1643         }
1644
1645         if (remote) {
1646                 if (filter_options.choice || repository_format_partial_clone)
1647                         fetch_one_setup_partial(remote);
1648                 result = fetch_one(remote, argc, argv, prune_tags_ok);
1649         } else {
1650                 if (filter_options.choice)
1651                         die(_("--filter can only be used with the remote "
1652                               "configured in extensions.partialclone"));
1653                 /* TODO should this also die if we have a previous partial-clone? */
1654                 result = fetch_multiple(&list);
1655         }
1656
1657         if (!result && (recurse_submodules != RECURSE_SUBMODULES_OFF)) {
1658                 struct argv_array options = ARGV_ARRAY_INIT;
1659
1660                 add_options_to_argv(&options);
1661                 result = fetch_populated_submodules(the_repository,
1662                                                     &options,
1663                                                     submodule_prefix,
1664                                                     recurse_submodules,
1665                                                     recurse_submodules_default,
1666                                                     verbosity < 0,
1667                                                     max_children);
1668                 argv_array_clear(&options);
1669         }
1670
1671         string_list_clear(&list, 0);
1672
1673         close_all_packs(the_repository->objects);
1674
1675         argv_array_pushl(&argv_gc_auto, "gc", "--auto", NULL);
1676         if (verbosity < 0)
1677                 argv_array_push(&argv_gc_auto, "--quiet");
1678         run_command_v_opt(argv_gc_auto.argv, RUN_GIT_CMD);
1679         argv_array_clear(&argv_gc_auto);
1680
1681         return result;
1682 }