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