Merge branch 'rs/rebase-commit-validation'
[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 "oidset.h"
11 #include "commit.h"
12 #include "builtin.h"
13 #include "string-list.h"
14 #include "remote.h"
15 #include "transport.h"
16 #include "run-command.h"
17 #include "parse-options.h"
18 #include "sigchain.h"
19 #include "submodule-config.h"
20 #include "submodule.h"
21 #include "connected.h"
22 #include "strvec.h"
23 #include "utf8.h"
24 #include "packfile.h"
25 #include "list-objects-filter-options.h"
26 #include "commit-reach.h"
27 #include "branch.h"
28 #include "promisor-remote.h"
29 #include "commit-graph.h"
30 #include "shallow.h"
31
32 #define FORCED_UPDATES_DELAY_WARNING_IN_MS (10 * 1000)
33
34 static const char * const builtin_fetch_usage[] = {
35         N_("git fetch [<options>] [<repository> [<refspec>...]]"),
36         N_("git fetch [<options>] <group>"),
37         N_("git fetch --multiple [<options>] [(<repository> | <group>)...]"),
38         N_("git fetch --all [<options>]"),
39         NULL
40 };
41
42 enum {
43         TAGS_UNSET = 0,
44         TAGS_DEFAULT = 1,
45         TAGS_SET = 2
46 };
47
48 static int fetch_prune_config = -1; /* unspecified */
49 static int fetch_show_forced_updates = 1;
50 static uint64_t forced_updates_ms = 0;
51 static int prune = -1; /* unspecified */
52 #define PRUNE_BY_DEFAULT 0 /* do we prune by default? */
53
54 static int fetch_prune_tags_config = -1; /* unspecified */
55 static int prune_tags = -1; /* unspecified */
56 #define PRUNE_TAGS_BY_DEFAULT 0 /* do we prune tags by default? */
57
58 static int all, append, dry_run, force, keep, multiple, update_head_ok;
59 static int write_fetch_head = 1;
60 static int verbosity, deepen_relative, set_upstream;
61 static int progress = -1;
62 static int enable_auto_gc = 1;
63 static int tags = TAGS_DEFAULT, unshallow, update_shallow, deepen;
64 static int max_jobs = -1, submodule_fetch_jobs_config = -1;
65 static int fetch_parallel_config = 1;
66 static enum transport_family family;
67 static const char *depth;
68 static const char *deepen_since;
69 static const char *upload_pack;
70 static struct string_list deepen_not = STRING_LIST_INIT_NODUP;
71 static struct strbuf default_rla = STRBUF_INIT;
72 static struct transport *gtransport;
73 static struct transport *gsecondary;
74 static const char *submodule_prefix = "";
75 static int recurse_submodules = RECURSE_SUBMODULES_DEFAULT;
76 static int recurse_submodules_default = RECURSE_SUBMODULES_ON_DEMAND;
77 static int shown_url = 0;
78 static struct refspec refmap = REFSPEC_INIT_FETCH;
79 static struct list_objects_filter_options filter_options;
80 static struct string_list server_options = STRING_LIST_INIT_DUP;
81 static struct string_list negotiation_tip = STRING_LIST_INIT_NODUP;
82 static int fetch_write_commit_graph = -1;
83 static int stdin_refspecs = 0;
84
85 static int git_fetch_config(const char *k, const char *v, void *cb)
86 {
87         if (!strcmp(k, "fetch.prune")) {
88                 fetch_prune_config = git_config_bool(k, v);
89                 return 0;
90         }
91
92         if (!strcmp(k, "fetch.prunetags")) {
93                 fetch_prune_tags_config = git_config_bool(k, v);
94                 return 0;
95         }
96
97         if (!strcmp(k, "fetch.showforcedupdates")) {
98                 fetch_show_forced_updates = git_config_bool(k, v);
99                 return 0;
100         }
101
102         if (!strcmp(k, "submodule.recurse")) {
103                 int r = git_config_bool(k, v) ?
104                         RECURSE_SUBMODULES_ON : RECURSE_SUBMODULES_OFF;
105                 recurse_submodules = r;
106         }
107
108         if (!strcmp(k, "submodule.fetchjobs")) {
109                 submodule_fetch_jobs_config = parse_submodule_fetchjobs(k, v);
110                 return 0;
111         } else if (!strcmp(k, "fetch.recursesubmodules")) {
112                 recurse_submodules = parse_fetch_recurse_submodules_arg(k, v);
113                 return 0;
114         }
115
116         if (!strcmp(k, "fetch.parallel")) {
117                 fetch_parallel_config = git_config_int(k, v);
118                 if (fetch_parallel_config < 0)
119                         die(_("fetch.parallel cannot be negative"));
120                 return 0;
121         }
122
123         return git_default_config(k, v, cb);
124 }
125
126 static int parse_refmap_arg(const struct option *opt, const char *arg, int unset)
127 {
128         BUG_ON_OPT_NEG(unset);
129
130         /*
131          * "git fetch --refmap='' origin foo"
132          * can be used to tell the command not to store anywhere
133          */
134         refspec_append(&refmap, arg);
135
136         return 0;
137 }
138
139 static struct option builtin_fetch_options[] = {
140         OPT__VERBOSITY(&verbosity),
141         OPT_BOOL(0, "all", &all,
142                  N_("fetch from all remotes")),
143         OPT_BOOL(0, "set-upstream", &set_upstream,
144                  N_("set upstream for git pull/fetch")),
145         OPT_BOOL('a', "append", &append,
146                  N_("append to .git/FETCH_HEAD instead of overwriting")),
147         OPT_STRING(0, "upload-pack", &upload_pack, N_("path"),
148                    N_("path to upload pack on remote end")),
149         OPT__FORCE(&force, N_("force overwrite of local reference"), 0),
150         OPT_BOOL('m', "multiple", &multiple,
151                  N_("fetch from multiple remotes")),
152         OPT_SET_INT('t', "tags", &tags,
153                     N_("fetch all tags and associated objects"), TAGS_SET),
154         OPT_SET_INT('n', NULL, &tags,
155                     N_("do not fetch all tags (--no-tags)"), TAGS_UNSET),
156         OPT_INTEGER('j', "jobs", &max_jobs,
157                     N_("number of submodules fetched in parallel")),
158         OPT_BOOL('p', "prune", &prune,
159                  N_("prune remote-tracking branches no longer on remote")),
160         OPT_BOOL('P', "prune-tags", &prune_tags,
161                  N_("prune local tags no longer on remote and clobber changed tags")),
162         OPT_CALLBACK_F(0, "recurse-submodules", &recurse_submodules, N_("on-demand"),
163                     N_("control recursive fetching of submodules"),
164                     PARSE_OPT_OPTARG, option_fetch_parse_recurse_submodules),
165         OPT_BOOL(0, "dry-run", &dry_run,
166                  N_("dry run")),
167         OPT_BOOL(0, "write-fetch-head", &write_fetch_head,
168                  N_("write fetched references to the FETCH_HEAD file")),
169         OPT_BOOL('k', "keep", &keep, N_("keep downloaded pack")),
170         OPT_BOOL('u', "update-head-ok", &update_head_ok,
171                     N_("allow updating of HEAD ref")),
172         OPT_BOOL(0, "progress", &progress, N_("force progress reporting")),
173         OPT_STRING(0, "depth", &depth, N_("depth"),
174                    N_("deepen history of shallow clone")),
175         OPT_STRING(0, "shallow-since", &deepen_since, N_("time"),
176                    N_("deepen history of shallow repository based on time")),
177         OPT_STRING_LIST(0, "shallow-exclude", &deepen_not, N_("revision"),
178                         N_("deepen history of shallow clone, excluding rev")),
179         OPT_INTEGER(0, "deepen", &deepen_relative,
180                     N_("deepen history of shallow clone")),
181         OPT_SET_INT_F(0, "unshallow", &unshallow,
182                       N_("convert to a complete repository"),
183                       1, PARSE_OPT_NONEG),
184         { OPTION_STRING, 0, "submodule-prefix", &submodule_prefix, N_("dir"),
185                    N_("prepend this to submodule path output"), PARSE_OPT_HIDDEN },
186         OPT_CALLBACK_F(0, "recurse-submodules-default",
187                    &recurse_submodules_default, N_("on-demand"),
188                    N_("default for recursive fetching of submodules "
189                       "(lower priority than config files)"),
190                    PARSE_OPT_HIDDEN, option_fetch_parse_recurse_submodules),
191         OPT_BOOL(0, "update-shallow", &update_shallow,
192                  N_("accept refs that update .git/shallow")),
193         OPT_CALLBACK_F(0, "refmap", NULL, N_("refmap"),
194                        N_("specify fetch refmap"), PARSE_OPT_NONEG, parse_refmap_arg),
195         OPT_STRING_LIST('o', "server-option", &server_options, N_("server-specific"), N_("option to transmit")),
196         OPT_SET_INT('4', "ipv4", &family, N_("use IPv4 addresses only"),
197                         TRANSPORT_FAMILY_IPV4),
198         OPT_SET_INT('6', "ipv6", &family, N_("use IPv6 addresses only"),
199                         TRANSPORT_FAMILY_IPV6),
200         OPT_STRING_LIST(0, "negotiation-tip", &negotiation_tip, N_("revision"),
201                         N_("report that we have only objects reachable from this object")),
202         OPT_PARSE_LIST_OBJECTS_FILTER(&filter_options),
203         OPT_BOOL(0, "auto-maintenance", &enable_auto_gc,
204                  N_("run 'maintenance --auto' after fetching")),
205         OPT_BOOL(0, "auto-gc", &enable_auto_gc,
206                  N_("run 'maintenance --auto' after fetching")),
207         OPT_BOOL(0, "show-forced-updates", &fetch_show_forced_updates,
208                  N_("check for forced-updates on all updated branches")),
209         OPT_BOOL(0, "write-commit-graph", &fetch_write_commit_graph,
210                  N_("write the commit-graph after fetching")),
211         OPT_BOOL(0, "stdin", &stdin_refspecs,
212                  N_("accept refspecs from stdin")),
213         OPT_END()
214 };
215
216 static void unlock_pack(void)
217 {
218         if (gtransport)
219                 transport_unlock_pack(gtransport);
220         if (gsecondary)
221                 transport_unlock_pack(gsecondary);
222 }
223
224 static void unlock_pack_on_signal(int signo)
225 {
226         unlock_pack();
227         sigchain_pop(signo);
228         raise(signo);
229 }
230
231 static void add_merge_config(struct ref **head,
232                            const struct ref *remote_refs,
233                            struct branch *branch,
234                            struct ref ***tail)
235 {
236         int i;
237
238         for (i = 0; i < branch->merge_nr; i++) {
239                 struct ref *rm, **old_tail = *tail;
240                 struct refspec_item refspec;
241
242                 for (rm = *head; rm; rm = rm->next) {
243                         if (branch_merge_matches(branch, i, rm->name)) {
244                                 rm->fetch_head_status = FETCH_HEAD_MERGE;
245                                 break;
246                         }
247                 }
248                 if (rm)
249                         continue;
250
251                 /*
252                  * Not fetched to a remote-tracking branch?  We need to fetch
253                  * it anyway to allow this branch's "branch.$name.merge"
254                  * to be honored by 'git pull', but we do not have to
255                  * fail if branch.$name.merge is misconfigured to point
256                  * at a nonexisting branch.  If we were indeed called by
257                  * 'git pull', it will notice the misconfiguration because
258                  * there is no entry in the resulting FETCH_HEAD marked
259                  * for merging.
260                  */
261                 memset(&refspec, 0, sizeof(refspec));
262                 refspec.src = branch->merge[i]->src;
263                 get_fetch_map(remote_refs, &refspec, tail, 1);
264                 for (rm = *old_tail; rm; rm = rm->next)
265                         rm->fetch_head_status = FETCH_HEAD_MERGE;
266         }
267 }
268
269 static void create_fetch_oidset(struct ref **head, struct oidset *out)
270 {
271         struct ref *rm = *head;
272         while (rm) {
273                 oidset_insert(out, &rm->old_oid);
274                 rm = rm->next;
275         }
276 }
277
278 struct refname_hash_entry {
279         struct hashmap_entry ent;
280         struct object_id oid;
281         int ignore;
282         char refname[FLEX_ARRAY];
283 };
284
285 static int refname_hash_entry_cmp(const void *hashmap_cmp_fn_data,
286                                   const struct hashmap_entry *eptr,
287                                   const struct hashmap_entry *entry_or_key,
288                                   const void *keydata)
289 {
290         const struct refname_hash_entry *e1, *e2;
291
292         e1 = container_of(eptr, const struct refname_hash_entry, ent);
293         e2 = container_of(entry_or_key, const struct refname_hash_entry, ent);
294         return strcmp(e1->refname, keydata ? keydata : e2->refname);
295 }
296
297 static struct refname_hash_entry *refname_hash_add(struct hashmap *map,
298                                                    const char *refname,
299                                                    const struct object_id *oid)
300 {
301         struct refname_hash_entry *ent;
302         size_t len = strlen(refname);
303
304         FLEX_ALLOC_MEM(ent, refname, refname, len);
305         hashmap_entry_init(&ent->ent, strhash(refname));
306         oidcpy(&ent->oid, oid);
307         hashmap_add(map, &ent->ent);
308         return ent;
309 }
310
311 static int add_one_refname(const char *refname,
312                            const struct object_id *oid,
313                            int flag, void *cbdata)
314 {
315         struct hashmap *refname_map = cbdata;
316
317         (void) refname_hash_add(refname_map, refname, oid);
318         return 0;
319 }
320
321 static void refname_hash_init(struct hashmap *map)
322 {
323         hashmap_init(map, refname_hash_entry_cmp, NULL, 0);
324 }
325
326 static int refname_hash_exists(struct hashmap *map, const char *refname)
327 {
328         return !!hashmap_get_from_hash(map, strhash(refname), refname);
329 }
330
331 static void clear_item(struct refname_hash_entry *item)
332 {
333         item->ignore = 1;
334 }
335
336 static void find_non_local_tags(const struct ref *refs,
337                                 struct ref **head,
338                                 struct ref ***tail)
339 {
340         struct hashmap existing_refs;
341         struct hashmap remote_refs;
342         struct oidset fetch_oids = OIDSET_INIT;
343         struct string_list remote_refs_list = STRING_LIST_INIT_NODUP;
344         struct string_list_item *remote_ref_item;
345         const struct ref *ref;
346         struct refname_hash_entry *item = NULL;
347         const int quick_flags = OBJECT_INFO_QUICK | OBJECT_INFO_SKIP_FETCH_OBJECT;
348
349         refname_hash_init(&existing_refs);
350         refname_hash_init(&remote_refs);
351         create_fetch_oidset(head, &fetch_oids);
352
353         for_each_ref(add_one_refname, &existing_refs);
354         for (ref = refs; ref; ref = ref->next) {
355                 if (!starts_with(ref->name, "refs/tags/"))
356                         continue;
357
358                 /*
359                  * The peeled ref always follows the matching base
360                  * ref, so if we see a peeled ref that we don't want
361                  * to fetch then we can mark the ref entry in the list
362                  * as one to ignore by setting util to NULL.
363                  */
364                 if (ends_with(ref->name, "^{}")) {
365                         if (item &&
366                             !has_object_file_with_flags(&ref->old_oid, quick_flags) &&
367                             !oidset_contains(&fetch_oids, &ref->old_oid) &&
368                             !has_object_file_with_flags(&item->oid, quick_flags) &&
369                             !oidset_contains(&fetch_oids, &item->oid))
370                                 clear_item(item);
371                         item = NULL;
372                         continue;
373                 }
374
375                 /*
376                  * If item is non-NULL here, then we previously saw a
377                  * ref not followed by a peeled reference, so we need
378                  * to check if it is a lightweight tag that we want to
379                  * fetch.
380                  */
381                 if (item &&
382                     !has_object_file_with_flags(&item->oid, quick_flags) &&
383                     !oidset_contains(&fetch_oids, &item->oid))
384                         clear_item(item);
385
386                 item = NULL;
387
388                 /* skip duplicates and refs that we already have */
389                 if (refname_hash_exists(&remote_refs, ref->name) ||
390                     refname_hash_exists(&existing_refs, ref->name))
391                         continue;
392
393                 item = refname_hash_add(&remote_refs, ref->name, &ref->old_oid);
394                 string_list_insert(&remote_refs_list, ref->name);
395         }
396         hashmap_clear_and_free(&existing_refs, struct refname_hash_entry, ent);
397
398         /*
399          * We may have a final lightweight tag that needs to be
400          * checked to see if it needs fetching.
401          */
402         if (item &&
403             !has_object_file_with_flags(&item->oid, quick_flags) &&
404             !oidset_contains(&fetch_oids, &item->oid))
405                 clear_item(item);
406
407         /*
408          * For all the tags in the remote_refs_list,
409          * add them to the list of refs to be fetched
410          */
411         for_each_string_list_item(remote_ref_item, &remote_refs_list) {
412                 const char *refname = remote_ref_item->string;
413                 struct ref *rm;
414                 unsigned int hash = strhash(refname);
415
416                 item = hashmap_get_entry_from_hash(&remote_refs, hash, refname,
417                                         struct refname_hash_entry, ent);
418                 if (!item)
419                         BUG("unseen remote ref?");
420
421                 /* Unless we have already decided to ignore this item... */
422                 if (item->ignore)
423                         continue;
424
425                 rm = alloc_ref(item->refname);
426                 rm->peer_ref = alloc_ref(item->refname);
427                 oidcpy(&rm->old_oid, &item->oid);
428                 **tail = rm;
429                 *tail = &rm->next;
430         }
431         hashmap_clear_and_free(&remote_refs, struct refname_hash_entry, ent);
432         string_list_clear(&remote_refs_list, 0);
433         oidset_clear(&fetch_oids);
434 }
435
436 static struct ref *get_ref_map(struct remote *remote,
437                                const struct ref *remote_refs,
438                                struct refspec *rs,
439                                int tags, int *autotags)
440 {
441         int i;
442         struct ref *rm;
443         struct ref *ref_map = NULL;
444         struct ref **tail = &ref_map;
445
446         /* opportunistically-updated references: */
447         struct ref *orefs = NULL, **oref_tail = &orefs;
448
449         struct hashmap existing_refs;
450         int existing_refs_populated = 0;
451
452         if (rs->nr) {
453                 struct refspec *fetch_refspec;
454
455                 for (i = 0; i < rs->nr; i++) {
456                         get_fetch_map(remote_refs, &rs->items[i], &tail, 0);
457                         if (rs->items[i].dst && rs->items[i].dst[0])
458                                 *autotags = 1;
459                 }
460                 /* Merge everything on the command line (but not --tags) */
461                 for (rm = ref_map; rm; rm = rm->next)
462                         rm->fetch_head_status = FETCH_HEAD_MERGE;
463
464                 /*
465                  * For any refs that we happen to be fetching via
466                  * command-line arguments, the destination ref might
467                  * have been missing or have been different than the
468                  * remote-tracking ref that would be derived from the
469                  * configured refspec.  In these cases, we want to
470                  * take the opportunity to update their configured
471                  * remote-tracking reference.  However, we do not want
472                  * to mention these entries in FETCH_HEAD at all, as
473                  * they would simply be duplicates of existing
474                  * entries, so we set them FETCH_HEAD_IGNORE below.
475                  *
476                  * We compute these entries now, based only on the
477                  * refspecs specified on the command line.  But we add
478                  * them to the list following the refspecs resulting
479                  * from the tags option so that one of the latter,
480                  * which has FETCH_HEAD_NOT_FOR_MERGE, is not removed
481                  * by ref_remove_duplicates() in favor of one of these
482                  * opportunistic entries with FETCH_HEAD_IGNORE.
483                  */
484                 if (refmap.nr)
485                         fetch_refspec = &refmap;
486                 else
487                         fetch_refspec = &remote->fetch;
488
489                 for (i = 0; i < fetch_refspec->nr; i++)
490                         get_fetch_map(ref_map, &fetch_refspec->items[i], &oref_tail, 1);
491         } else if (refmap.nr) {
492                 die("--refmap option is only meaningful with command-line refspec(s).");
493         } else {
494                 /* Use the defaults */
495                 struct branch *branch = branch_get(NULL);
496                 int has_merge = branch_has_merge_config(branch);
497                 if (remote &&
498                     (remote->fetch.nr ||
499                      /* Note: has_merge implies non-NULL branch->remote_name */
500                      (has_merge && !strcmp(branch->remote_name, remote->name)))) {
501                         for (i = 0; i < remote->fetch.nr; i++) {
502                                 get_fetch_map(remote_refs, &remote->fetch.items[i], &tail, 0);
503                                 if (remote->fetch.items[i].dst &&
504                                     remote->fetch.items[i].dst[0])
505                                         *autotags = 1;
506                                 if (!i && !has_merge && ref_map &&
507                                     !remote->fetch.items[0].pattern)
508                                         ref_map->fetch_head_status = FETCH_HEAD_MERGE;
509                         }
510                         /*
511                          * if the remote we're fetching from is the same
512                          * as given in branch.<name>.remote, we add the
513                          * ref given in branch.<name>.merge, too.
514                          *
515                          * Note: has_merge implies non-NULL branch->remote_name
516                          */
517                         if (has_merge &&
518                             !strcmp(branch->remote_name, remote->name))
519                                 add_merge_config(&ref_map, remote_refs, branch, &tail);
520                 } else {
521                         ref_map = get_remote_ref(remote_refs, "HEAD");
522                         if (!ref_map)
523                                 die(_("Couldn't find remote ref HEAD"));
524                         ref_map->fetch_head_status = FETCH_HEAD_MERGE;
525                         tail = &ref_map->next;
526                 }
527         }
528
529         if (tags == TAGS_SET)
530                 /* also fetch all tags */
531                 get_fetch_map(remote_refs, tag_refspec, &tail, 0);
532         else if (tags == TAGS_DEFAULT && *autotags)
533                 find_non_local_tags(remote_refs, &ref_map, &tail);
534
535         /* Now append any refs to be updated opportunistically: */
536         *tail = orefs;
537         for (rm = orefs; rm; rm = rm->next) {
538                 rm->fetch_head_status = FETCH_HEAD_IGNORE;
539                 tail = &rm->next;
540         }
541
542         /*
543          * apply negative refspecs first, before we remove duplicates. This is
544          * necessary as negative refspecs might remove an otherwise conflicting
545          * duplicate.
546          */
547         if (rs->nr)
548                 ref_map = apply_negative_refspecs(ref_map, rs);
549         else
550                 ref_map = apply_negative_refspecs(ref_map, &remote->fetch);
551
552         ref_map = ref_remove_duplicates(ref_map);
553
554         for (rm = ref_map; rm; rm = rm->next) {
555                 if (rm->peer_ref) {
556                         const char *refname = rm->peer_ref->name;
557                         struct refname_hash_entry *peer_item;
558                         unsigned int hash = strhash(refname);
559
560                         if (!existing_refs_populated) {
561                                 refname_hash_init(&existing_refs);
562                                 for_each_ref(add_one_refname, &existing_refs);
563                                 existing_refs_populated = 1;
564                         }
565
566                         peer_item = hashmap_get_entry_from_hash(&existing_refs,
567                                                 hash, refname,
568                                                 struct refname_hash_entry, ent);
569                         if (peer_item) {
570                                 struct object_id *old_oid = &peer_item->oid;
571                                 oidcpy(&rm->peer_ref->old_oid, old_oid);
572                         }
573                 }
574         }
575         if (existing_refs_populated)
576                 hashmap_clear_and_free(&existing_refs, struct refname_hash_entry, ent);
577
578         return ref_map;
579 }
580
581 #define STORE_REF_ERROR_OTHER 1
582 #define STORE_REF_ERROR_DF_CONFLICT 2
583
584 static int s_update_ref(const char *action,
585                         struct ref *ref,
586                         int check_old)
587 {
588         char *msg;
589         char *rla = getenv("GIT_REFLOG_ACTION");
590         struct ref_transaction *transaction;
591         struct strbuf err = STRBUF_INIT;
592         int ret, df_conflict = 0;
593
594         if (dry_run)
595                 return 0;
596         if (!rla)
597                 rla = default_rla.buf;
598         msg = xstrfmt("%s: %s", rla, action);
599
600         transaction = ref_transaction_begin(&err);
601         if (!transaction ||
602             ref_transaction_update(transaction, ref->name,
603                                    &ref->new_oid,
604                                    check_old ? &ref->old_oid : NULL,
605                                    0, msg, &err))
606                 goto fail;
607
608         ret = ref_transaction_commit(transaction, &err);
609         if (ret) {
610                 df_conflict = (ret == TRANSACTION_NAME_CONFLICT);
611                 goto fail;
612         }
613
614         ref_transaction_free(transaction);
615         strbuf_release(&err);
616         free(msg);
617         return 0;
618 fail:
619         ref_transaction_free(transaction);
620         error("%s", err.buf);
621         strbuf_release(&err);
622         free(msg);
623         return df_conflict ? STORE_REF_ERROR_DF_CONFLICT
624                            : STORE_REF_ERROR_OTHER;
625 }
626
627 static int refcol_width = 10;
628 static int compact_format;
629
630 static void adjust_refcol_width(const struct ref *ref)
631 {
632         int max, rlen, llen, len;
633
634         /* uptodate lines are only shown on high verbosity level */
635         if (!verbosity && oideq(&ref->peer_ref->old_oid, &ref->old_oid))
636                 return;
637
638         max    = term_columns();
639         rlen   = utf8_strwidth(prettify_refname(ref->name));
640
641         llen   = utf8_strwidth(prettify_refname(ref->peer_ref->name));
642
643         /*
644          * rough estimation to see if the output line is too long and
645          * should not be counted (we can't do precise calculation
646          * anyway because we don't know if the error explanation part
647          * will be printed in update_local_ref)
648          */
649         if (compact_format) {
650                 llen = 0;
651                 max = max * 2 / 3;
652         }
653         len = 21 /* flag and summary */ + rlen + 4 /* -> */ + llen;
654         if (len >= max)
655                 return;
656
657         /*
658          * Not precise calculation for compact mode because '*' can
659          * appear on the left hand side of '->' and shrink the column
660          * back.
661          */
662         if (refcol_width < rlen)
663                 refcol_width = rlen;
664 }
665
666 static void prepare_format_display(struct ref *ref_map)
667 {
668         struct ref *rm;
669         const char *format = "full";
670
671         git_config_get_string_tmp("fetch.output", &format);
672         if (!strcasecmp(format, "full"))
673                 compact_format = 0;
674         else if (!strcasecmp(format, "compact"))
675                 compact_format = 1;
676         else
677                 die(_("configuration fetch.output contains invalid value %s"),
678                     format);
679
680         for (rm = ref_map; rm; rm = rm->next) {
681                 if (rm->status == REF_STATUS_REJECT_SHALLOW ||
682                     !rm->peer_ref ||
683                     !strcmp(rm->name, "HEAD"))
684                         continue;
685
686                 adjust_refcol_width(rm);
687         }
688 }
689
690 static void print_remote_to_local(struct strbuf *display,
691                                   const char *remote, const char *local)
692 {
693         strbuf_addf(display, "%-*s -> %s", refcol_width, remote, local);
694 }
695
696 static int find_and_replace(struct strbuf *haystack,
697                             const char *needle,
698                             const char *placeholder)
699 {
700         const char *p = NULL;
701         int plen, nlen;
702
703         nlen = strlen(needle);
704         if (ends_with(haystack->buf, needle))
705                 p = haystack->buf + haystack->len - nlen;
706         else
707                 p = strstr(haystack->buf, needle);
708         if (!p)
709                 return 0;
710
711         if (p > haystack->buf && p[-1] != '/')
712                 return 0;
713
714         plen = strlen(p);
715         if (plen > nlen && p[nlen] != '/')
716                 return 0;
717
718         strbuf_splice(haystack, p - haystack->buf, nlen,
719                       placeholder, strlen(placeholder));
720         return 1;
721 }
722
723 static void print_compact(struct strbuf *display,
724                           const char *remote, const char *local)
725 {
726         struct strbuf r = STRBUF_INIT;
727         struct strbuf l = STRBUF_INIT;
728
729         if (!strcmp(remote, local)) {
730                 strbuf_addf(display, "%-*s -> *", refcol_width, remote);
731                 return;
732         }
733
734         strbuf_addstr(&r, remote);
735         strbuf_addstr(&l, local);
736
737         if (!find_and_replace(&r, local, "*"))
738                 find_and_replace(&l, remote, "*");
739         print_remote_to_local(display, r.buf, l.buf);
740
741         strbuf_release(&r);
742         strbuf_release(&l);
743 }
744
745 static void format_display(struct strbuf *display, char code,
746                            const char *summary, const char *error,
747                            const char *remote, const char *local,
748                            int summary_width)
749 {
750         int width = (summary_width + strlen(summary) - gettext_width(summary));
751
752         strbuf_addf(display, "%c %-*s ", code, width, summary);
753         if (!compact_format)
754                 print_remote_to_local(display, remote, local);
755         else
756                 print_compact(display, remote, local);
757         if (error)
758                 strbuf_addf(display, "  (%s)", error);
759 }
760
761 static int update_local_ref(struct ref *ref,
762                             const char *remote,
763                             const struct ref *remote_ref,
764                             struct strbuf *display,
765                             int summary_width)
766 {
767         struct commit *current = NULL, *updated;
768         enum object_type type;
769         struct branch *current_branch = branch_get(NULL);
770         const char *pretty_ref = prettify_refname(ref->name);
771         int fast_forward = 0;
772
773         type = oid_object_info(the_repository, &ref->new_oid, NULL);
774         if (type < 0)
775                 die(_("object %s not found"), oid_to_hex(&ref->new_oid));
776
777         if (oideq(&ref->old_oid, &ref->new_oid)) {
778                 if (verbosity > 0)
779                         format_display(display, '=', _("[up to date]"), NULL,
780                                        remote, pretty_ref, summary_width);
781                 return 0;
782         }
783
784         if (current_branch &&
785             !strcmp(ref->name, current_branch->name) &&
786             !(update_head_ok || is_bare_repository()) &&
787             !is_null_oid(&ref->old_oid)) {
788                 /*
789                  * If this is the head, and it's not okay to update
790                  * the head, and the old value of the head isn't empty...
791                  */
792                 format_display(display, '!', _("[rejected]"),
793                                _("can't fetch in current branch"),
794                                remote, pretty_ref, summary_width);
795                 return 1;
796         }
797
798         if (!is_null_oid(&ref->old_oid) &&
799             starts_with(ref->name, "refs/tags/")) {
800                 if (force || ref->force) {
801                         int r;
802                         r = s_update_ref("updating tag", ref, 0);
803                         format_display(display, r ? '!' : 't', _("[tag update]"),
804                                        r ? _("unable to update local ref") : NULL,
805                                        remote, pretty_ref, summary_width);
806                         return r;
807                 } else {
808                         format_display(display, '!', _("[rejected]"), _("would clobber existing tag"),
809                                        remote, pretty_ref, summary_width);
810                         return 1;
811                 }
812         }
813
814         current = lookup_commit_reference_gently(the_repository,
815                                                  &ref->old_oid, 1);
816         updated = lookup_commit_reference_gently(the_repository,
817                                                  &ref->new_oid, 1);
818         if (!current || !updated) {
819                 const char *msg;
820                 const char *what;
821                 int r;
822                 /*
823                  * Nicely describe the new ref we're fetching.
824                  * Base this on the remote's ref name, as it's
825                  * more likely to follow a standard layout.
826                  */
827                 const char *name = remote_ref ? remote_ref->name : "";
828                 if (starts_with(name, "refs/tags/")) {
829                         msg = "storing tag";
830                         what = _("[new tag]");
831                 } else if (starts_with(name, "refs/heads/")) {
832                         msg = "storing head";
833                         what = _("[new branch]");
834                 } else {
835                         msg = "storing ref";
836                         what = _("[new ref]");
837                 }
838
839                 r = s_update_ref(msg, ref, 0);
840                 format_display(display, r ? '!' : '*', what,
841                                r ? _("unable to update local ref") : NULL,
842                                remote, pretty_ref, summary_width);
843                 return r;
844         }
845
846         if (fetch_show_forced_updates) {
847                 uint64_t t_before = getnanotime();
848                 fast_forward = in_merge_bases(current, updated);
849                 forced_updates_ms += (getnanotime() - t_before) / 1000000;
850         } else {
851                 fast_forward = 1;
852         }
853
854         if (fast_forward) {
855                 struct strbuf quickref = STRBUF_INIT;
856                 int r;
857
858                 strbuf_add_unique_abbrev(&quickref, &current->object.oid, DEFAULT_ABBREV);
859                 strbuf_addstr(&quickref, "..");
860                 strbuf_add_unique_abbrev(&quickref, &ref->new_oid, DEFAULT_ABBREV);
861                 r = s_update_ref("fast-forward", ref, 1);
862                 format_display(display, r ? '!' : ' ', quickref.buf,
863                                r ? _("unable to update local ref") : NULL,
864                                remote, pretty_ref, summary_width);
865                 strbuf_release(&quickref);
866                 return r;
867         } else if (force || ref->force) {
868                 struct strbuf quickref = STRBUF_INIT;
869                 int r;
870                 strbuf_add_unique_abbrev(&quickref, &current->object.oid, DEFAULT_ABBREV);
871                 strbuf_addstr(&quickref, "...");
872                 strbuf_add_unique_abbrev(&quickref, &ref->new_oid, DEFAULT_ABBREV);
873                 r = s_update_ref("forced-update", ref, 1);
874                 format_display(display, r ? '!' : '+', quickref.buf,
875                                r ? _("unable to update local ref") : _("forced update"),
876                                remote, pretty_ref, summary_width);
877                 strbuf_release(&quickref);
878                 return r;
879         } else {
880                 format_display(display, '!', _("[rejected]"), _("non-fast-forward"),
881                                remote, pretty_ref, summary_width);
882                 return 1;
883         }
884 }
885
886 static int iterate_ref_map(void *cb_data, struct object_id *oid)
887 {
888         struct ref **rm = cb_data;
889         struct ref *ref = *rm;
890
891         while (ref && ref->status == REF_STATUS_REJECT_SHALLOW)
892                 ref = ref->next;
893         if (!ref)
894                 return -1; /* end of the list */
895         *rm = ref->next;
896         oidcpy(oid, &ref->old_oid);
897         return 0;
898 }
899
900 static const char warn_show_forced_updates[] =
901 N_("Fetch normally indicates which branches had a forced update,\n"
902    "but that check has been disabled. To re-enable, use '--show-forced-updates'\n"
903    "flag or run 'git config fetch.showForcedUpdates true'.");
904 static const char warn_time_show_forced_updates[] =
905 N_("It took %.2f seconds to check forced updates. You can use\n"
906    "'--no-show-forced-updates' or run 'git config fetch.showForcedUpdates false'\n"
907    " to avoid this check.\n");
908
909 static int store_updated_refs(const char *raw_url, const char *remote_name,
910                               int connectivity_checked, struct ref *ref_map)
911 {
912         FILE *fp;
913         struct commit *commit;
914         int url_len, i, rc = 0;
915         struct strbuf note = STRBUF_INIT;
916         const char *what, *kind;
917         struct ref *rm;
918         char *url;
919         const char *filename = (!write_fetch_head
920                                 ? "/dev/null"
921                                 : git_path_fetch_head(the_repository));
922         int want_status;
923         int summary_width = transport_summary_width(ref_map);
924
925         fp = fopen(filename, "a");
926         if (!fp)
927                 return error_errno(_("cannot open %s"), filename);
928
929         if (raw_url)
930                 url = transport_anonymize_url(raw_url);
931         else
932                 url = xstrdup("foreign");
933
934         if (!connectivity_checked) {
935                 struct check_connected_options opt = CHECK_CONNECTED_INIT;
936
937                 rm = ref_map;
938                 if (check_connected(iterate_ref_map, &rm, &opt)) {
939                         rc = error(_("%s did not send all necessary objects\n"), url);
940                         goto abort;
941                 }
942         }
943
944         prepare_format_display(ref_map);
945
946         /*
947          * We do a pass for each fetch_head_status type in their enum order, so
948          * merged entries are written before not-for-merge. That lets readers
949          * use FETCH_HEAD as a refname to refer to the ref to be merged.
950          */
951         for (want_status = FETCH_HEAD_MERGE;
952              want_status <= FETCH_HEAD_IGNORE;
953              want_status++) {
954                 for (rm = ref_map; rm; rm = rm->next) {
955                         struct ref *ref = NULL;
956                         const char *merge_status_marker = "";
957
958                         if (rm->status == REF_STATUS_REJECT_SHALLOW) {
959                                 if (want_status == FETCH_HEAD_MERGE)
960                                         warning(_("reject %s because shallow roots are not allowed to be updated"),
961                                                 rm->peer_ref ? rm->peer_ref->name : rm->name);
962                                 continue;
963                         }
964
965                         commit = lookup_commit_reference_gently(the_repository,
966                                                                 &rm->old_oid,
967                                                                 1);
968                         if (!commit)
969                                 rm->fetch_head_status = FETCH_HEAD_NOT_FOR_MERGE;
970
971                         if (rm->fetch_head_status != want_status)
972                                 continue;
973
974                         if (rm->peer_ref) {
975                                 ref = alloc_ref(rm->peer_ref->name);
976                                 oidcpy(&ref->old_oid, &rm->peer_ref->old_oid);
977                                 oidcpy(&ref->new_oid, &rm->old_oid);
978                                 ref->force = rm->peer_ref->force;
979                         }
980
981                         if (recurse_submodules != RECURSE_SUBMODULES_OFF &&
982                             (!rm->peer_ref || !oideq(&ref->old_oid, &ref->new_oid))) {
983                                 check_for_new_submodule_commits(&rm->old_oid);
984                         }
985
986                         if (!strcmp(rm->name, "HEAD")) {
987                                 kind = "";
988                                 what = "";
989                         }
990                         else if (skip_prefix(rm->name, "refs/heads/", &what))
991                                 kind = "branch";
992                         else if (skip_prefix(rm->name, "refs/tags/", &what))
993                                 kind = "tag";
994                         else if (skip_prefix(rm->name, "refs/remotes/", &what))
995                                 kind = "remote-tracking branch";
996                         else {
997                                 kind = "";
998                                 what = rm->name;
999                         }
1000
1001                         url_len = strlen(url);
1002                         for (i = url_len - 1; url[i] == '/' && 0 <= i; i--)
1003                                 ;
1004                         url_len = i + 1;
1005                         if (4 < i && !strncmp(".git", url + i - 3, 4))
1006                                 url_len = i - 3;
1007
1008                         strbuf_reset(&note);
1009                         if (*what) {
1010                                 if (*kind)
1011                                         strbuf_addf(&note, "%s ", kind);
1012                                 strbuf_addf(&note, "'%s' of ", what);
1013                         }
1014                         switch (rm->fetch_head_status) {
1015                         case FETCH_HEAD_NOT_FOR_MERGE:
1016                                 merge_status_marker = "not-for-merge";
1017                                 /* fall-through */
1018                         case FETCH_HEAD_MERGE:
1019                                 fprintf(fp, "%s\t%s\t%s",
1020                                         oid_to_hex(&rm->old_oid),
1021                                         merge_status_marker,
1022                                         note.buf);
1023                                 for (i = 0; i < url_len; ++i)
1024                                         if ('\n' == url[i])
1025                                                 fputs("\\n", fp);
1026                                         else
1027                                                 fputc(url[i], fp);
1028                                 fputc('\n', fp);
1029                                 break;
1030                         default:
1031                                 /* do not write anything to FETCH_HEAD */
1032                                 break;
1033                         }
1034
1035                         strbuf_reset(&note);
1036                         if (ref) {
1037                                 rc |= update_local_ref(ref, what, rm, &note,
1038                                                        summary_width);
1039                                 free(ref);
1040                         } else if (write_fetch_head || dry_run) {
1041                                 /*
1042                                  * Display fetches written to FETCH_HEAD (or
1043                                  * would be written to FETCH_HEAD, if --dry-run
1044                                  * is set).
1045                                  */
1046                                 format_display(&note, '*',
1047                                                *kind ? kind : "branch", NULL,
1048                                                *what ? what : "HEAD",
1049                                                "FETCH_HEAD", summary_width);
1050                         }
1051                         if (note.len) {
1052                                 if (verbosity >= 0 && !shown_url) {
1053                                         fprintf(stderr, _("From %.*s\n"),
1054                                                         url_len, url);
1055                                         shown_url = 1;
1056                                 }
1057                                 if (verbosity >= 0)
1058                                         fprintf(stderr, " %s\n", note.buf);
1059                         }
1060                 }
1061         }
1062
1063         if (rc & STORE_REF_ERROR_DF_CONFLICT)
1064                 error(_("some local refs could not be updated; try running\n"
1065                       " 'git remote prune %s' to remove any old, conflicting "
1066                       "branches"), remote_name);
1067
1068         if (advice_fetch_show_forced_updates) {
1069                 if (!fetch_show_forced_updates) {
1070                         warning(_(warn_show_forced_updates));
1071                 } else if (forced_updates_ms > FORCED_UPDATES_DELAY_WARNING_IN_MS) {
1072                         warning(_(warn_time_show_forced_updates),
1073                                 forced_updates_ms / 1000.0);
1074                 }
1075         }
1076
1077  abort:
1078         strbuf_release(&note);
1079         free(url);
1080         fclose(fp);
1081         return rc;
1082 }
1083
1084 /*
1085  * We would want to bypass the object transfer altogether if
1086  * everything we are going to fetch already exists and is connected
1087  * locally.
1088  */
1089 static int check_exist_and_connected(struct ref *ref_map)
1090 {
1091         struct ref *rm = ref_map;
1092         struct check_connected_options opt = CHECK_CONNECTED_INIT;
1093         struct ref *r;
1094
1095         /*
1096          * If we are deepening a shallow clone we already have these
1097          * objects reachable.  Running rev-list here will return with
1098          * a good (0) exit status and we'll bypass the fetch that we
1099          * really need to perform.  Claiming failure now will ensure
1100          * we perform the network exchange to deepen our history.
1101          */
1102         if (deepen)
1103                 return -1;
1104
1105         /*
1106          * check_connected() allows objects to merely be promised, but
1107          * we need all direct targets to exist.
1108          */
1109         for (r = rm; r; r = r->next) {
1110                 if (!has_object_file_with_flags(&r->old_oid,
1111                                                 OBJECT_INFO_SKIP_FETCH_OBJECT))
1112                         return -1;
1113         }
1114
1115         opt.quiet = 1;
1116         return check_connected(iterate_ref_map, &rm, &opt);
1117 }
1118
1119 static int fetch_refs(struct transport *transport, struct ref *ref_map)
1120 {
1121         int ret = check_exist_and_connected(ref_map);
1122         if (ret) {
1123                 trace2_region_enter("fetch", "fetch_refs", the_repository);
1124                 ret = transport_fetch_refs(transport, ref_map);
1125                 trace2_region_leave("fetch", "fetch_refs", the_repository);
1126         }
1127         if (!ret)
1128                 /*
1129                  * Keep the new pack's ".keep" file around to allow the caller
1130                  * time to update refs to reference the new objects.
1131                  */
1132                 return 0;
1133         transport_unlock_pack(transport);
1134         return ret;
1135 }
1136
1137 /* Update local refs based on the ref values fetched from a remote */
1138 static int consume_refs(struct transport *transport, struct ref *ref_map)
1139 {
1140         int connectivity_checked = transport->smart_options
1141                 ? transport->smart_options->connectivity_checked : 0;
1142         int ret;
1143         trace2_region_enter("fetch", "consume_refs", the_repository);
1144         ret = store_updated_refs(transport->url,
1145                                  transport->remote->name,
1146                                  connectivity_checked,
1147                                  ref_map);
1148         transport_unlock_pack(transport);
1149         trace2_region_leave("fetch", "consume_refs", the_repository);
1150         return ret;
1151 }
1152
1153 static int prune_refs(struct refspec *rs, struct ref *ref_map,
1154                       const char *raw_url)
1155 {
1156         int url_len, i, result = 0;
1157         struct ref *ref, *stale_refs = get_stale_heads(rs, ref_map);
1158         char *url;
1159         int summary_width = transport_summary_width(stale_refs);
1160         const char *dangling_msg = dry_run
1161                 ? _("   (%s will become dangling)")
1162                 : _("   (%s has become dangling)");
1163
1164         if (raw_url)
1165                 url = transport_anonymize_url(raw_url);
1166         else
1167                 url = xstrdup("foreign");
1168
1169         url_len = strlen(url);
1170         for (i = url_len - 1; url[i] == '/' && 0 <= i; i--)
1171                 ;
1172
1173         url_len = i + 1;
1174         if (4 < i && !strncmp(".git", url + i - 3, 4))
1175                 url_len = i - 3;
1176
1177         if (!dry_run) {
1178                 struct string_list refnames = STRING_LIST_INIT_NODUP;
1179
1180                 for (ref = stale_refs; ref; ref = ref->next)
1181                         string_list_append(&refnames, ref->name);
1182
1183                 result = delete_refs("fetch: prune", &refnames, 0);
1184                 string_list_clear(&refnames, 0);
1185         }
1186
1187         if (verbosity >= 0) {
1188                 for (ref = stale_refs; ref; ref = ref->next) {
1189                         struct strbuf sb = STRBUF_INIT;
1190                         if (!shown_url) {
1191                                 fprintf(stderr, _("From %.*s\n"), url_len, url);
1192                                 shown_url = 1;
1193                         }
1194                         format_display(&sb, '-', _("[deleted]"), NULL,
1195                                        _("(none)"), prettify_refname(ref->name),
1196                                        summary_width);
1197                         fprintf(stderr, " %s\n",sb.buf);
1198                         strbuf_release(&sb);
1199                         warn_dangling_symref(stderr, dangling_msg, ref->name);
1200                 }
1201         }
1202
1203         free(url);
1204         free_refs(stale_refs);
1205         return result;
1206 }
1207
1208 static void check_not_current_branch(struct ref *ref_map)
1209 {
1210         struct branch *current_branch = branch_get(NULL);
1211
1212         if (is_bare_repository() || !current_branch)
1213                 return;
1214
1215         for (; ref_map; ref_map = ref_map->next)
1216                 if (ref_map->peer_ref && !strcmp(current_branch->refname,
1217                                         ref_map->peer_ref->name))
1218                         die(_("Refusing to fetch into current branch %s "
1219                             "of non-bare repository"), current_branch->refname);
1220 }
1221
1222 static int truncate_fetch_head(void)
1223 {
1224         const char *filename = git_path_fetch_head(the_repository);
1225         FILE *fp = fopen_for_writing(filename);
1226
1227         if (!fp)
1228                 return error_errno(_("cannot open %s"), filename);
1229         fclose(fp);
1230         return 0;
1231 }
1232
1233 static void set_option(struct transport *transport, const char *name, const char *value)
1234 {
1235         int r = transport_set_option(transport, name, value);
1236         if (r < 0)
1237                 die(_("Option \"%s\" value \"%s\" is not valid for %s"),
1238                     name, value, transport->url);
1239         if (r > 0)
1240                 warning(_("Option \"%s\" is ignored for %s\n"),
1241                         name, transport->url);
1242 }
1243
1244
1245 static int add_oid(const char *refname, const struct object_id *oid, int flags,
1246                    void *cb_data)
1247 {
1248         struct oid_array *oids = cb_data;
1249
1250         oid_array_append(oids, oid);
1251         return 0;
1252 }
1253
1254 static void add_negotiation_tips(struct git_transport_options *smart_options)
1255 {
1256         struct oid_array *oids = xcalloc(1, sizeof(*oids));
1257         int i;
1258
1259         for (i = 0; i < negotiation_tip.nr; i++) {
1260                 const char *s = negotiation_tip.items[i].string;
1261                 int old_nr;
1262                 if (!has_glob_specials(s)) {
1263                         struct object_id oid;
1264                         if (get_oid(s, &oid))
1265                                 die("%s is not a valid object", s);
1266                         oid_array_append(oids, &oid);
1267                         continue;
1268                 }
1269                 old_nr = oids->nr;
1270                 for_each_glob_ref(add_oid, s, oids);
1271                 if (old_nr == oids->nr)
1272                         warning("Ignoring --negotiation-tip=%s because it does not match any refs",
1273                                 s);
1274         }
1275         smart_options->negotiation_tips = oids;
1276 }
1277
1278 static struct transport *prepare_transport(struct remote *remote, int deepen)
1279 {
1280         struct transport *transport;
1281
1282         transport = transport_get(remote, NULL);
1283         transport_set_verbosity(transport, verbosity, progress);
1284         transport->family = family;
1285         if (upload_pack)
1286                 set_option(transport, TRANS_OPT_UPLOADPACK, upload_pack);
1287         if (keep)
1288                 set_option(transport, TRANS_OPT_KEEP, "yes");
1289         if (depth)
1290                 set_option(transport, TRANS_OPT_DEPTH, depth);
1291         if (deepen && deepen_since)
1292                 set_option(transport, TRANS_OPT_DEEPEN_SINCE, deepen_since);
1293         if (deepen && deepen_not.nr)
1294                 set_option(transport, TRANS_OPT_DEEPEN_NOT,
1295                            (const char *)&deepen_not);
1296         if (deepen_relative)
1297                 set_option(transport, TRANS_OPT_DEEPEN_RELATIVE, "yes");
1298         if (update_shallow)
1299                 set_option(transport, TRANS_OPT_UPDATE_SHALLOW, "yes");
1300         if (filter_options.choice) {
1301                 const char *spec =
1302                         expand_list_objects_filter_spec(&filter_options);
1303                 set_option(transport, TRANS_OPT_LIST_OBJECTS_FILTER, spec);
1304                 set_option(transport, TRANS_OPT_FROM_PROMISOR, "1");
1305         }
1306         if (negotiation_tip.nr) {
1307                 if (transport->smart_options)
1308                         add_negotiation_tips(transport->smart_options);
1309                 else
1310                         warning("Ignoring --negotiation-tip because the protocol does not support it.");
1311         }
1312         return transport;
1313 }
1314
1315 static void backfill_tags(struct transport *transport, struct ref *ref_map)
1316 {
1317         int cannot_reuse;
1318
1319         /*
1320          * Once we have set TRANS_OPT_DEEPEN_SINCE, we can't unset it
1321          * when remote helper is used (setting it to an empty string
1322          * is not unsetting). We could extend the remote helper
1323          * protocol for that, but for now, just force a new connection
1324          * without deepen-since. Similar story for deepen-not.
1325          */
1326         cannot_reuse = transport->cannot_reuse ||
1327                 deepen_since || deepen_not.nr;
1328         if (cannot_reuse) {
1329                 gsecondary = prepare_transport(transport->remote, 0);
1330                 transport = gsecondary;
1331         }
1332
1333         transport_set_option(transport, TRANS_OPT_FOLLOWTAGS, NULL);
1334         transport_set_option(transport, TRANS_OPT_DEPTH, "0");
1335         transport_set_option(transport, TRANS_OPT_DEEPEN_RELATIVE, NULL);
1336         if (!fetch_refs(transport, ref_map))
1337                 consume_refs(transport, ref_map);
1338
1339         if (gsecondary) {
1340                 transport_disconnect(gsecondary);
1341                 gsecondary = NULL;
1342         }
1343 }
1344
1345 static int do_fetch(struct transport *transport,
1346                     struct refspec *rs)
1347 {
1348         struct ref *ref_map;
1349         int autotags = (transport->remote->fetch_tags == 1);
1350         int retcode = 0;
1351         const struct ref *remote_refs;
1352         struct strvec ref_prefixes = STRVEC_INIT;
1353         int must_list_refs = 1;
1354
1355         if (tags == TAGS_DEFAULT) {
1356                 if (transport->remote->fetch_tags == 2)
1357                         tags = TAGS_SET;
1358                 if (transport->remote->fetch_tags == -1)
1359                         tags = TAGS_UNSET;
1360         }
1361
1362         /* if not appending, truncate FETCH_HEAD */
1363         if (!append && write_fetch_head) {
1364                 retcode = truncate_fetch_head();
1365                 if (retcode)
1366                         goto cleanup;
1367         }
1368
1369         if (rs->nr) {
1370                 int i;
1371
1372                 refspec_ref_prefixes(rs, &ref_prefixes);
1373
1374                 /*
1375                  * We can avoid listing refs if all of them are exact
1376                  * OIDs
1377                  */
1378                 must_list_refs = 0;
1379                 for (i = 0; i < rs->nr; i++) {
1380                         if (!rs->items[i].exact_sha1) {
1381                                 must_list_refs = 1;
1382                                 break;
1383                         }
1384                 }
1385         } else if (transport->remote && transport->remote->fetch.nr)
1386                 refspec_ref_prefixes(&transport->remote->fetch, &ref_prefixes);
1387
1388         if (tags == TAGS_SET || tags == TAGS_DEFAULT) {
1389                 must_list_refs = 1;
1390                 if (ref_prefixes.nr)
1391                         strvec_push(&ref_prefixes, "refs/tags/");
1392         }
1393
1394         if (must_list_refs) {
1395                 trace2_region_enter("fetch", "remote_refs", the_repository);
1396                 remote_refs = transport_get_remote_refs(transport, &ref_prefixes);
1397                 trace2_region_leave("fetch", "remote_refs", the_repository);
1398         } else
1399                 remote_refs = NULL;
1400
1401         strvec_clear(&ref_prefixes);
1402
1403         ref_map = get_ref_map(transport->remote, remote_refs, rs,
1404                               tags, &autotags);
1405         if (!update_head_ok)
1406                 check_not_current_branch(ref_map);
1407
1408         if (tags == TAGS_DEFAULT && autotags)
1409                 transport_set_option(transport, TRANS_OPT_FOLLOWTAGS, "1");
1410         if (prune) {
1411                 /*
1412                  * We only prune based on refspecs specified
1413                  * explicitly (via command line or configuration); we
1414                  * don't care whether --tags was specified.
1415                  */
1416                 if (rs->nr) {
1417                         prune_refs(rs, ref_map, transport->url);
1418                 } else {
1419                         prune_refs(&transport->remote->fetch,
1420                                    ref_map,
1421                                    transport->url);
1422                 }
1423         }
1424         if (fetch_refs(transport, ref_map) || consume_refs(transport, ref_map)) {
1425                 free_refs(ref_map);
1426                 retcode = 1;
1427                 goto cleanup;
1428         }
1429
1430         if (set_upstream) {
1431                 struct branch *branch = branch_get("HEAD");
1432                 struct ref *rm;
1433                 struct ref *source_ref = NULL;
1434
1435                 /*
1436                  * We're setting the upstream configuration for the
1437                  * current branch. The relevant upstream is the
1438                  * fetched branch that is meant to be merged with the
1439                  * current one, i.e. the one fetched to FETCH_HEAD.
1440                  *
1441                  * When there are several such branches, consider the
1442                  * request ambiguous and err on the safe side by doing
1443                  * nothing and just emit a warning.
1444                  */
1445                 for (rm = ref_map; rm; rm = rm->next) {
1446                         if (!rm->peer_ref) {
1447                                 if (source_ref) {
1448                                         warning(_("multiple branches detected, incompatible with --set-upstream"));
1449                                         goto skip;
1450                                 } else {
1451                                         source_ref = rm;
1452                                 }
1453                         }
1454                 }
1455                 if (source_ref) {
1456                         if (!strcmp(source_ref->name, "HEAD") ||
1457                             starts_with(source_ref->name, "refs/heads/"))
1458                                 install_branch_config(0,
1459                                                       branch->name,
1460                                                       transport->remote->name,
1461                                                       source_ref->name);
1462                         else if (starts_with(source_ref->name, "refs/remotes/"))
1463                                 warning(_("not setting upstream for a remote remote-tracking branch"));
1464                         else if (starts_with(source_ref->name, "refs/tags/"))
1465                                 warning(_("not setting upstream for a remote tag"));
1466                         else
1467                                 warning(_("unknown branch type"));
1468                 } else {
1469                         warning(_("no source branch found.\n"
1470                                 "you need to specify exactly one branch with the --set-upstream option."));
1471                 }
1472         }
1473  skip:
1474         free_refs(ref_map);
1475
1476         /* if neither --no-tags nor --tags was specified, do automated tag
1477          * following ... */
1478         if (tags == TAGS_DEFAULT && autotags) {
1479                 struct ref **tail = &ref_map;
1480                 ref_map = NULL;
1481                 find_non_local_tags(remote_refs, &ref_map, &tail);
1482                 if (ref_map)
1483                         backfill_tags(transport, ref_map);
1484                 free_refs(ref_map);
1485         }
1486
1487  cleanup:
1488         return retcode;
1489 }
1490
1491 static int get_one_remote_for_fetch(struct remote *remote, void *priv)
1492 {
1493         struct string_list *list = priv;
1494         if (!remote->skip_default_update)
1495                 string_list_append(list, remote->name);
1496         return 0;
1497 }
1498
1499 struct remote_group_data {
1500         const char *name;
1501         struct string_list *list;
1502 };
1503
1504 static int get_remote_group(const char *key, const char *value, void *priv)
1505 {
1506         struct remote_group_data *g = priv;
1507
1508         if (skip_prefix(key, "remotes.", &key) && !strcmp(key, g->name)) {
1509                 /* split list by white space */
1510                 while (*value) {
1511                         size_t wordlen = strcspn(value, " \t\n");
1512
1513                         if (wordlen >= 1)
1514                                 string_list_append_nodup(g->list,
1515                                                    xstrndup(value, wordlen));
1516                         value += wordlen + (value[wordlen] != '\0');
1517                 }
1518         }
1519
1520         return 0;
1521 }
1522
1523 static int add_remote_or_group(const char *name, struct string_list *list)
1524 {
1525         int prev_nr = list->nr;
1526         struct remote_group_data g;
1527         g.name = name; g.list = list;
1528
1529         git_config(get_remote_group, &g);
1530         if (list->nr == prev_nr) {
1531                 struct remote *remote = remote_get(name);
1532                 if (!remote_is_configured(remote, 0))
1533                         return 0;
1534                 string_list_append(list, remote->name);
1535         }
1536         return 1;
1537 }
1538
1539 static void add_options_to_argv(struct strvec *argv)
1540 {
1541         if (dry_run)
1542                 strvec_push(argv, "--dry-run");
1543         if (prune != -1)
1544                 strvec_push(argv, prune ? "--prune" : "--no-prune");
1545         if (prune_tags != -1)
1546                 strvec_push(argv, prune_tags ? "--prune-tags" : "--no-prune-tags");
1547         if (update_head_ok)
1548                 strvec_push(argv, "--update-head-ok");
1549         if (force)
1550                 strvec_push(argv, "--force");
1551         if (keep)
1552                 strvec_push(argv, "--keep");
1553         if (recurse_submodules == RECURSE_SUBMODULES_ON)
1554                 strvec_push(argv, "--recurse-submodules");
1555         else if (recurse_submodules == RECURSE_SUBMODULES_ON_DEMAND)
1556                 strvec_push(argv, "--recurse-submodules=on-demand");
1557         if (tags == TAGS_SET)
1558                 strvec_push(argv, "--tags");
1559         else if (tags == TAGS_UNSET)
1560                 strvec_push(argv, "--no-tags");
1561         if (verbosity >= 2)
1562                 strvec_push(argv, "-v");
1563         if (verbosity >= 1)
1564                 strvec_push(argv, "-v");
1565         else if (verbosity < 0)
1566                 strvec_push(argv, "-q");
1567         if (family == TRANSPORT_FAMILY_IPV4)
1568                 strvec_push(argv, "--ipv4");
1569         else if (family == TRANSPORT_FAMILY_IPV6)
1570                 strvec_push(argv, "--ipv6");
1571 }
1572
1573 /* Fetch multiple remotes in parallel */
1574
1575 struct parallel_fetch_state {
1576         const char **argv;
1577         struct string_list *remotes;
1578         int next, result;
1579 };
1580
1581 static int fetch_next_remote(struct child_process *cp, struct strbuf *out,
1582                              void *cb, void **task_cb)
1583 {
1584         struct parallel_fetch_state *state = cb;
1585         char *remote;
1586
1587         if (state->next < 0 || state->next >= state->remotes->nr)
1588                 return 0;
1589
1590         remote = state->remotes->items[state->next++].string;
1591         *task_cb = remote;
1592
1593         strvec_pushv(&cp->args, state->argv);
1594         strvec_push(&cp->args, remote);
1595         cp->git_cmd = 1;
1596
1597         if (verbosity >= 0)
1598                 printf(_("Fetching %s\n"), remote);
1599
1600         return 1;
1601 }
1602
1603 static int fetch_failed_to_start(struct strbuf *out, void *cb, void *task_cb)
1604 {
1605         struct parallel_fetch_state *state = cb;
1606         const char *remote = task_cb;
1607
1608         state->result = error(_("Could not fetch %s"), remote);
1609
1610         return 0;
1611 }
1612
1613 static int fetch_finished(int result, struct strbuf *out,
1614                           void *cb, void *task_cb)
1615 {
1616         struct parallel_fetch_state *state = cb;
1617         const char *remote = task_cb;
1618
1619         if (result) {
1620                 strbuf_addf(out, _("could not fetch '%s' (exit code: %d)\n"),
1621                             remote, result);
1622                 state->result = -1;
1623         }
1624
1625         return 0;
1626 }
1627
1628 static int fetch_multiple(struct string_list *list, int max_children)
1629 {
1630         int i, result = 0;
1631         struct strvec argv = STRVEC_INIT;
1632
1633         if (!append && write_fetch_head) {
1634                 int errcode = truncate_fetch_head();
1635                 if (errcode)
1636                         return errcode;
1637         }
1638
1639         strvec_pushl(&argv, "fetch", "--append", "--no-auto-gc",
1640                      "--no-write-commit-graph", NULL);
1641         add_options_to_argv(&argv);
1642
1643         if (max_children != 1 && list->nr != 1) {
1644                 struct parallel_fetch_state state = { argv.v, list, 0, 0 };
1645
1646                 strvec_push(&argv, "--end-of-options");
1647                 result = run_processes_parallel_tr2(max_children,
1648                                                     &fetch_next_remote,
1649                                                     &fetch_failed_to_start,
1650                                                     &fetch_finished,
1651                                                     &state,
1652                                                     "fetch", "parallel/fetch");
1653
1654                 if (!result)
1655                         result = state.result;
1656         } else
1657                 for (i = 0; i < list->nr; i++) {
1658                         const char *name = list->items[i].string;
1659                         strvec_push(&argv, name);
1660                         if (verbosity >= 0)
1661                                 printf(_("Fetching %s\n"), name);
1662                         if (run_command_v_opt(argv.v, RUN_GIT_CMD)) {
1663                                 error(_("Could not fetch %s"), name);
1664                                 result = 1;
1665                         }
1666                         strvec_pop(&argv);
1667                 }
1668
1669         strvec_clear(&argv);
1670         return !!result;
1671 }
1672
1673 /*
1674  * Fetching from the promisor remote should use the given filter-spec
1675  * or inherit the default filter-spec from the config.
1676  */
1677 static inline void fetch_one_setup_partial(struct remote *remote)
1678 {
1679         /*
1680          * Explicit --no-filter argument overrides everything, regardless
1681          * of any prior partial clones and fetches.
1682          */
1683         if (filter_options.no_filter)
1684                 return;
1685
1686         /*
1687          * If no prior partial clone/fetch and the current fetch DID NOT
1688          * request a partial-fetch, do a normal fetch.
1689          */
1690         if (!has_promisor_remote() && !filter_options.choice)
1691                 return;
1692
1693         /*
1694          * If this is a partial-fetch request, we enable partial on
1695          * this repo if not already enabled and remember the given
1696          * filter-spec as the default for subsequent fetches to this
1697          * remote if there is currently no default filter-spec.
1698          */
1699         if (filter_options.choice) {
1700                 partial_clone_register(remote->name, &filter_options);
1701                 return;
1702         }
1703
1704         /*
1705          * Do a partial-fetch from the promisor remote using either the
1706          * explicitly given filter-spec or inherit the filter-spec from
1707          * the config.
1708          */
1709         if (!filter_options.choice)
1710                 partial_clone_get_default_filter_spec(&filter_options, remote->name);
1711         return;
1712 }
1713
1714 static int fetch_one(struct remote *remote, int argc, const char **argv,
1715                      int prune_tags_ok, int use_stdin_refspecs)
1716 {
1717         struct refspec rs = REFSPEC_INIT_FETCH;
1718         int i;
1719         int exit_code;
1720         int maybe_prune_tags;
1721         int remote_via_config = remote_is_configured(remote, 0);
1722
1723         if (!remote)
1724                 die(_("No remote repository specified.  Please, specify either a URL or a\n"
1725                     "remote name from which new revisions should be fetched."));
1726
1727         gtransport = prepare_transport(remote, 1);
1728
1729         if (prune < 0) {
1730                 /* no command line request */
1731                 if (0 <= remote->prune)
1732                         prune = remote->prune;
1733                 else if (0 <= fetch_prune_config)
1734                         prune = fetch_prune_config;
1735                 else
1736                         prune = PRUNE_BY_DEFAULT;
1737         }
1738
1739         if (prune_tags < 0) {
1740                 /* no command line request */
1741                 if (0 <= remote->prune_tags)
1742                         prune_tags = remote->prune_tags;
1743                 else if (0 <= fetch_prune_tags_config)
1744                         prune_tags = fetch_prune_tags_config;
1745                 else
1746                         prune_tags = PRUNE_TAGS_BY_DEFAULT;
1747         }
1748
1749         maybe_prune_tags = prune_tags_ok && prune_tags;
1750         if (maybe_prune_tags && remote_via_config)
1751                 refspec_append(&remote->fetch, TAG_REFSPEC);
1752
1753         if (maybe_prune_tags && (argc || !remote_via_config))
1754                 refspec_append(&rs, TAG_REFSPEC);
1755
1756         for (i = 0; i < argc; i++) {
1757                 if (!strcmp(argv[i], "tag")) {
1758                         i++;
1759                         if (i >= argc)
1760                                 die(_("You need to specify a tag name."));
1761
1762                         refspec_appendf(&rs, "refs/tags/%s:refs/tags/%s",
1763                                         argv[i], argv[i]);
1764                 } else {
1765                         refspec_append(&rs, argv[i]);
1766                 }
1767         }
1768
1769         if (use_stdin_refspecs) {
1770                 struct strbuf line = STRBUF_INIT;
1771                 while (strbuf_getline_lf(&line, stdin) != EOF)
1772                         refspec_append(&rs, line.buf);
1773                 strbuf_release(&line);
1774         }
1775
1776         if (server_options.nr)
1777                 gtransport->server_options = &server_options;
1778
1779         sigchain_push_common(unlock_pack_on_signal);
1780         atexit(unlock_pack);
1781         sigchain_push(SIGPIPE, SIG_IGN);
1782         exit_code = do_fetch(gtransport, &rs);
1783         sigchain_pop(SIGPIPE);
1784         refspec_clear(&rs);
1785         transport_disconnect(gtransport);
1786         gtransport = NULL;
1787         return exit_code;
1788 }
1789
1790 int cmd_fetch(int argc, const char **argv, const char *prefix)
1791 {
1792         int i;
1793         struct string_list list = STRING_LIST_INIT_DUP;
1794         struct remote *remote = NULL;
1795         int result = 0;
1796         int prune_tags_ok = 1;
1797
1798         packet_trace_identity("fetch");
1799
1800         /* Record the command line for the reflog */
1801         strbuf_addstr(&default_rla, "fetch");
1802         for (i = 1; i < argc; i++) {
1803                 /* This handles non-URLs gracefully */
1804                 char *anon = transport_anonymize_url(argv[i]);
1805
1806                 strbuf_addf(&default_rla, " %s", anon);
1807                 free(anon);
1808         }
1809
1810         git_config(git_fetch_config, NULL);
1811
1812         argc = parse_options(argc, argv, prefix,
1813                              builtin_fetch_options, builtin_fetch_usage, 0);
1814         if (recurse_submodules != RECURSE_SUBMODULES_OFF) {
1815                 int *sfjc = submodule_fetch_jobs_config == -1
1816                             ? &submodule_fetch_jobs_config : NULL;
1817                 int *rs = recurse_submodules == RECURSE_SUBMODULES_DEFAULT
1818                           ? &recurse_submodules : NULL;
1819
1820                 fetch_config_from_gitmodules(sfjc, rs);
1821         }
1822
1823         if (deepen_relative) {
1824                 if (deepen_relative < 0)
1825                         die(_("Negative depth in --deepen is not supported"));
1826                 if (depth)
1827                         die(_("--deepen and --depth are mutually exclusive"));
1828                 depth = xstrfmt("%d", deepen_relative);
1829         }
1830         if (unshallow) {
1831                 if (depth)
1832                         die(_("--depth and --unshallow cannot be used together"));
1833                 else if (!is_repository_shallow(the_repository))
1834                         die(_("--unshallow on a complete repository does not make sense"));
1835                 else
1836                         depth = xstrfmt("%d", INFINITE_DEPTH);
1837         }
1838
1839         /* no need to be strict, transport_set_option() will validate it again */
1840         if (depth && atoi(depth) < 1)
1841                 die(_("depth %s is not a positive number"), depth);
1842         if (depth || deepen_since || deepen_not.nr)
1843                 deepen = 1;
1844
1845         /* FETCH_HEAD never gets updated in --dry-run mode */
1846         if (dry_run)
1847                 write_fetch_head = 0;
1848
1849         if (all) {
1850                 if (argc == 1)
1851                         die(_("fetch --all does not take a repository argument"));
1852                 else if (argc > 1)
1853                         die(_("fetch --all does not make sense with refspecs"));
1854                 (void) for_each_remote(get_one_remote_for_fetch, &list);
1855         } else if (argc == 0) {
1856                 /* No arguments -- use default remote */
1857                 remote = remote_get(NULL);
1858         } else if (multiple) {
1859                 /* All arguments are assumed to be remotes or groups */
1860                 for (i = 0; i < argc; i++)
1861                         if (!add_remote_or_group(argv[i], &list))
1862                                 die(_("No such remote or remote group: %s"), argv[i]);
1863         } else {
1864                 /* Single remote or group */
1865                 (void) add_remote_or_group(argv[0], &list);
1866                 if (list.nr > 1) {
1867                         /* More than one remote */
1868                         if (argc > 1)
1869                                 die(_("Fetching a group and specifying refspecs does not make sense"));
1870                 } else {
1871                         /* Zero or one remotes */
1872                         remote = remote_get(argv[0]);
1873                         prune_tags_ok = (argc == 1);
1874                         argc--;
1875                         argv++;
1876                 }
1877         }
1878
1879         if (remote) {
1880                 if (filter_options.choice || has_promisor_remote())
1881                         fetch_one_setup_partial(remote);
1882                 result = fetch_one(remote, argc, argv, prune_tags_ok, stdin_refspecs);
1883         } else {
1884                 int max_children = max_jobs;
1885
1886                 if (filter_options.choice)
1887                         die(_("--filter can only be used with the remote "
1888                               "configured in extensions.partialclone"));
1889
1890                 if (stdin_refspecs)
1891                         die(_("--stdin can only be used when fetching "
1892                               "from one remote"));
1893
1894                 if (max_children < 0)
1895                         max_children = fetch_parallel_config;
1896
1897                 /* TODO should this also die if we have a previous partial-clone? */
1898                 result = fetch_multiple(&list, max_children);
1899         }
1900
1901         if (!result && (recurse_submodules != RECURSE_SUBMODULES_OFF)) {
1902                 struct strvec options = STRVEC_INIT;
1903                 int max_children = max_jobs;
1904
1905                 if (max_children < 0)
1906                         max_children = submodule_fetch_jobs_config;
1907                 if (max_children < 0)
1908                         max_children = fetch_parallel_config;
1909
1910                 add_options_to_argv(&options);
1911                 result = fetch_populated_submodules(the_repository,
1912                                                     &options,
1913                                                     submodule_prefix,
1914                                                     recurse_submodules,
1915                                                     recurse_submodules_default,
1916                                                     verbosity < 0,
1917                                                     max_children);
1918                 strvec_clear(&options);
1919         }
1920
1921         string_list_clear(&list, 0);
1922
1923         prepare_repo_settings(the_repository);
1924         if (fetch_write_commit_graph > 0 ||
1925             (fetch_write_commit_graph < 0 &&
1926              the_repository->settings.fetch_write_commit_graph)) {
1927                 int commit_graph_flags = COMMIT_GRAPH_WRITE_SPLIT;
1928
1929                 if (progress)
1930                         commit_graph_flags |= COMMIT_GRAPH_WRITE_PROGRESS;
1931
1932                 write_commit_graph_reachable(the_repository->objects->odb,
1933                                              commit_graph_flags,
1934                                              NULL);
1935         }
1936
1937         close_object_store(the_repository->objects);
1938
1939         if (enable_auto_gc)
1940                 run_auto_maintenance(verbosity < 0);
1941
1942         return result;
1943 }