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