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