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
  81 static int git_fetch_config(const char *k, const char *v, void *cb)
  82 {
  83         if (!strcmp(k, "fetch.prune")) {
  84                 fetch_prune_config = git_config_bool(k, v);
  85                 return 0;
  86         }
  87
  88         if (!strcmp(k, "fetch.prunetags")) {
  89                 fetch_prune_tags_config = git_config_bool(k, v);
  90                 return 0;
  91         }
  92
  93         if (!strcmp(k, "fetch.showforcedupdates")) {
  94                 fetch_show_forced_updates = git_config_bool(k, v);
  95                 return 0;
  96         }
  97
  98         if (!strcmp(k, "submodule.recurse")) {
  99                 int r = git_config_bool(k, v) ?
 100                         RECURSE_SUBMODULES_ON : RECURSE_SUBMODULES_OFF;
 101                 recurse_submodules = r;
 102         }
 103
 104         if (!strcmp(k, "submodule.fetchjobs")) {
 105                 submodule_fetch_jobs_config = parse_submodule_fetchjobs(k, v);
 106                 return 0;
 107         } else if (!strcmp(k, "fetch.recursesubmodules")) {
 108                 recurse_submodules = parse_fetch_recurse_submodules_arg(k, v);
 109                 return 0;
 110         }
 111
 112         if (!strcmp(k, "fetch.parallel")) {
 113                 fetch_parallel_config = git_config_int(k, v);
 114                 if (fetch_parallel_config < 0)
 115                         die(_("fetch.parallel cannot be negative"));
 116                 return 0;
 117         }
 118
 119         return git_default_config(k, v, cb);
 120 }
 121
 122 static int parse_refmap_arg(const struct option *opt, const char *arg, int unset)
 123 {
 124         BUG_ON_OPT_NEG(unset);
 125
 126         /*
 127          * "git fetch --refmap='' origin foo"
 128          * can be used to tell the command not to store anywhere
 129          */
 130         refspec_append(&refmap, arg);
 131
 132         return 0;
 133 }
 134
 135 static struct option builtin_fetch_options[] = {
 136         OPT__VERBOSITY(&verbosity),
 137         OPT_BOOL(0, "all", &all,
 138                  N_("fetch from all remotes")),
 139         OPT_BOOL(0, "set-upstream", &set_upstream,
 140                  N_("set upstream for git pull/fetch")),
 141         OPT_BOOL('a', "append", &append,
 142                  N_("append to .git/FETCH_HEAD instead of overwriting")),
 143         OPT_STRING(0, "upload-pack", &upload_pack, N_("path"),
 144                    N_("path to upload pack on remote end")),
 145         OPT__FORCE(&force, N_("force overwrite of local reference"), 0),
 146         OPT_BOOL('m', "multiple", &multiple,
 147                  N_("fetch from multiple remotes")),
 148         OPT_SET_INT('t', "tags", &tags,
 149                     N_("fetch all tags and associated objects"), TAGS_SET),
 150         OPT_SET_INT('n', NULL, &tags,
 151                     N_("do not fetch all tags (--no-tags)"), TAGS_UNSET),
 152         OPT_INTEGER('j', "jobs", &max_jobs,
 153                     N_("number of submodules fetched in parallel")),
 154         OPT_BOOL('p', "prune", &prune,
 155                  N_("prune remote-tracking branches no longer on remote")),
 156         OPT_BOOL('P', "prune-tags", &prune_tags,
 157                  N_("prune local tags no longer on remote and clobber changed tags")),
 158         { OPTION_CALLBACK, 0, "recurse-submodules", &recurse_submodules, N_("on-demand"),
 159                     N_("control recursive fetching of submodules"),
 160                     PARSE_OPT_OPTARG, option_fetch_parse_recurse_submodules },
 161         OPT_BOOL(0, "dry-run", &dry_run,
 162                  N_("dry run")),
 163         OPT_BOOL('k', "keep", &keep, N_("keep downloaded pack")),
 164         OPT_BOOL('u', "update-head-ok", &update_head_ok,
 165                     N_("allow updating of HEAD ref")),
 166         OPT_BOOL(0, "progress", &progress, N_("force progress reporting")),
 167         OPT_STRING(0, "depth", &depth, N_("depth"),
 168                    N_("deepen history of shallow clone")),
 169         OPT_STRING(0, "shallow-since", &deepen_since, N_("time"),
 170                    N_("deepen history of shallow repository based on time")),
 171         OPT_STRING_LIST(0, "shallow-exclude", &deepen_not, N_("revision"),
 172                         N_("deepen history of shallow clone, excluding rev")),
 173         OPT_INTEGER(0, "deepen", &deepen_relative,
 174                     N_("deepen history of shallow clone")),
 175         OPT_SET_INT_F(0, "unshallow", &unshallow,
 176                       N_("convert to a complete repository"),
 177                       1, PARSE_OPT_NONEG),
 178         { OPTION_STRING, 0, "submodule-prefix", &submodule_prefix, N_("dir"),
 179                    N_("prepend this to submodule path output"), PARSE_OPT_HIDDEN },
 180         { OPTION_CALLBACK, 0, "recurse-submodules-default",
 181                    &recurse_submodules_default, N_("on-demand"),
 182                    N_("default for recursive fetching of submodules "
 183                       "(lower priority than config files)"),
 184                    PARSE_OPT_HIDDEN, option_fetch_parse_recurse_submodules },
 185         OPT_BOOL(0, "update-shallow", &update_shallow,
 186                  N_("accept refs that update .git/shallow")),
 187         { OPTION_CALLBACK, 0, "refmap", NULL, N_("refmap"),
 188           N_("specify fetch refmap"), PARSE_OPT_NONEG, parse_refmap_arg },
 189         OPT_STRING_LIST('o', "server-option", &server_options, N_("server-specific"), N_("option to transmit")),
 190         OPT_SET_INT('4', "ipv4", &family, N_("use IPv4 addresses only"),
 191                         TRANSPORT_FAMILY_IPV4),
 192         OPT_SET_INT('6', "ipv6", &family, N_("use IPv6 addresses only"),
 193                         TRANSPORT_FAMILY_IPV6),
 194         OPT_STRING_LIST(0, "negotiation-tip", &negotiation_tip, N_("revision"),
 195                         N_("report that we have only objects reachable from this object")),
 196         OPT_PARSE_LIST_OBJECTS_FILTER(&filter_options),
 197         OPT_BOOL(0, "auto-gc", &enable_auto_gc,
 198                  N_("run 'gc --auto' after fetching")),
 199         OPT_BOOL(0, "show-forced-updates", &fetch_show_forced_updates,
 200                  N_("check for forced-updates on all updated branches")),
 201         OPT_END()
 202 };
 203
 204 static void unlock_pack(void)
 205 {
 206         if (gtransport)
 207                 transport_unlock_pack(gtransport);
 208         if (gsecondary)
 209                 transport_unlock_pack(gsecondary);
 210 }
 211
 212 static void unlock_pack_on_signal(int signo)
 213 {
 214         unlock_pack();
 215         sigchain_pop(signo);
 216         raise(signo);
 217 }
 218
 219 static void add_merge_config(struct ref **head,
 220                            const struct ref *remote_refs,
 221                            struct branch *branch,
 222                            struct ref ***tail)
 223 {
 224         int i;
 225
 226         for (i = 0; i < branch->merge_nr; i++) {
 227                 struct ref *rm, **old_tail = *tail;
 228                 struct refspec_item refspec;
 229
 230                 for (rm = *head; rm; rm = rm->next) {
 231                         if (branch_merge_matches(branch, i, rm->name)) {
 232                                 rm->fetch_head_status = FETCH_HEAD_MERGE;
 233                                 break;
 234                         }
 235                 }
 236                 if (rm)
 237                         continue;
 238
 239                 /*
 240                  * Not fetched to a remote-tracking branch?  We need to fetch
 241                  * it anyway to allow this branch's "branch.$name.merge"
 242                  * to be honored by 'git pull', but we do not have to
 243                  * fail if branch.$name.merge is misconfigured to point
 244                  * at a nonexisting branch.  If we were indeed called by
 245                  * 'git pull', it will notice the misconfiguration because
 246                  * there is no entry in the resulting FETCH_HEAD marked
 247                  * for merging.
 248                  */
 249                 memset(&refspec, 0, sizeof(refspec));
 250                 refspec.src = branch->merge[i]->src;
 251                 get_fetch_map(remote_refs, &refspec, tail, 1);
 252                 for (rm = *old_tail; rm; rm = rm->next)
 253                         rm->fetch_head_status = FETCH_HEAD_MERGE;
 254         }
 255 }
 256
 257 static void create_fetch_oidset(struct ref **head, struct oidset *out)
 258 {
 259         struct ref *rm = *head;
 260         while (rm) {
 261                 oidset_insert(out, &rm->old_oid);
 262                 rm = rm->next;
 263         }
 264 }
 265
 266 struct refname_hash_entry {
 267         struct hashmap_entry ent; /* must be the first member */
 268         struct object_id oid;
 269         int ignore;
 270         char refname[FLEX_ARRAY];
 271 };
 272
 273 static int refname_hash_entry_cmp(const void *hashmap_cmp_fn_data,
 274                                   const void *e1_,
 275                                   const void *e2_,
 276                                   const void *keydata)
 277 {
 278         const struct refname_hash_entry *e1 = e1_;
 279         const struct refname_hash_entry *e2 = e2_;
 280
 281         return strcmp(e1->refname, keydata ? keydata : e2->refname);
 282 }
 283
 284 static struct refname_hash_entry *refname_hash_add(struct hashmap *map,
 285                                                    const char *refname,
 286                                                    const struct object_id *oid)
 287 {
 288         struct refname_hash_entry *ent;
 289         size_t len = strlen(refname);
 290
 291         FLEX_ALLOC_MEM(ent, refname, refname, len);
 292         hashmap_entry_init(ent, strhash(refname));
 293         oidcpy(&ent->oid, oid);
 294         hashmap_add(map, ent);
 295         return ent;
 296 }
 297
 298 static int add_one_refname(const char *refname,
 299                            const struct object_id *oid,
 300                            int flag, void *cbdata)
 301 {
 302         struct hashmap *refname_map = cbdata;
 303
 304         (void) refname_hash_add(refname_map, refname, oid);
 305         return 0;
 306 }
 307
 308 static void refname_hash_init(struct hashmap *map)
 309 {
 310         hashmap_init(map, refname_hash_entry_cmp, NULL, 0);
 311 }
 312
 313 static int refname_hash_exists(struct hashmap *map, const char *refname)
 314 {
 315         return !!hashmap_get_from_hash(map, strhash(refname), refname);
 316 }
 317
 318 static void clear_item(struct refname_hash_entry *item)
 319 {
 320         item->ignore = 1;
 321 }
 322
 323 static void find_non_local_tags(const struct ref *refs,
 324                                 struct ref **head,
 325                                 struct ref ***tail)
 326 {
 327         struct hashmap existing_refs;
 328         struct hashmap remote_refs;
 329         struct oidset fetch_oids = OIDSET_INIT;
 330         struct string_list remote_refs_list = STRING_LIST_INIT_NODUP;
 331         struct string_list_item *remote_ref_item;
 332         const struct ref *ref;
 333         struct refname_hash_entry *item = NULL;
 334
 335         refname_hash_init(&existing_refs);
 336         refname_hash_init(&remote_refs);
 337         create_fetch_oidset(head, &fetch_oids);
 338
 339         for_each_ref(add_one_refname, &existing_refs);
 340         for (ref = refs; ref; ref = ref->next) {
 341                 if (!starts_with(ref->name, "refs/tags/"))
 342                         continue;
 343
 344                 /*
 345                  * The peeled ref always follows the matching base
 346                  * ref, so if we see a peeled ref that we don't want
 347                  * to fetch then we can mark the ref entry in the list
 348                  * as one to ignore by setting util to NULL.
 349                  */
 350                 if (ends_with(ref->name, "^{}")) {
 351                         if (item &&
 352                             !has_object_file_with_flags(&ref->old_oid,
 353                                                         OBJECT_INFO_QUICK) &&
 354                             !oidset_contains(&fetch_oids, &ref->old_oid) &&
 355                             !has_object_file_with_flags(&item->oid, OBJECT_INFO_QUICK) &&
 356                             !oidset_contains(&fetch_oids, &item->oid))
 357                                 clear_item(item);
 358                         item = NULL;
 359                         continue;
 360                 }
 361
 362                 /*
 363                  * If item is non-NULL here, then we previously saw a
 364                  * ref not followed by a peeled reference, so we need
 365                  * to check if it is a lightweight tag that we want to
 366                  * fetch.
 367                  */
 368                 if (item &&
 369                     !has_object_file_with_flags(&item->oid, OBJECT_INFO_QUICK) &&
 370                     !oidset_contains(&fetch_oids, &item->oid))
 371                         clear_item(item);
 372
 373                 item = NULL;
 374
 375                 /* skip duplicates and refs that we already have */
 376                 if (refname_hash_exists(&remote_refs, ref->name) ||
 377                     refname_hash_exists(&existing_refs, ref->name))
 378                         continue;
 379
 380                 item = refname_hash_add(&remote_refs, ref->name, &ref->old_oid);
 381                 string_list_insert(&remote_refs_list, ref->name);
 382         }
 383         hashmap_free(&existing_refs, 1);
 384
 385         /*
 386          * We may have a final lightweight tag that needs to be
 387          * checked to see if it needs fetching.
 388          */
 389         if (item &&
 390             !has_object_file_with_flags(&item->oid, OBJECT_INFO_QUICK) &&
 391             !oidset_contains(&fetch_oids, &item->oid))
 392                 clear_item(item);
 393
 394         /*
 395          * For all the tags in the remote_refs_list,
 396          * add them to the list of refs to be fetched
 397          */
 398         for_each_string_list_item(remote_ref_item, &remote_refs_list) {
 399                 const char *refname = remote_ref_item->string;
 400                 struct ref *rm;
 401
 402                 item = hashmap_get_from_hash(&remote_refs, strhash(refname), refname);
 403                 if (!item)
 404                         BUG("unseen remote ref?");
 405
 406                 /* Unless we have already decided to ignore this item... */
 407                 if (item->ignore)
 408                         continue;
 409
 410                 rm = alloc_ref(item->refname);
 411                 rm->peer_ref = alloc_ref(item->refname);
 412                 oidcpy(&rm->old_oid, &item->oid);
 413                 **tail = rm;
 414                 *tail = &rm->next;
 415         }
 416         hashmap_free(&remote_refs, 1);
 417         string_list_clear(&remote_refs_list, 0);
 418         oidset_clear(&fetch_oids);
 419 }
 420
 421 static struct ref *get_ref_map(struct remote *remote,
 422                                const struct ref *remote_refs,
 423                                struct refspec *rs,
 424                                int tags, int *autotags)
 425 {
 426         int i;
 427         struct ref *rm;
 428         struct ref *ref_map = NULL;
 429         struct ref **tail = &ref_map;
 430
 431         /* opportunistically-updated references: */
 432         struct ref *orefs = NULL, **oref_tail = &orefs;
 433
 434         struct hashmap existing_refs;
 435
 436         if (rs->nr) {
 437                 struct refspec *fetch_refspec;
 438
 439                 for (i = 0; i < rs->nr; i++) {
 440                         get_fetch_map(remote_refs, &rs->items[i], &tail, 0);
 441                         if (rs->items[i].dst && rs->items[i].dst[0])
 442                                 *autotags = 1;
 443                 }
 444                 /* Merge everything on the command line (but not --tags) */
 445                 for (rm = ref_map; rm; rm = rm->next)
 446                         rm->fetch_head_status = FETCH_HEAD_MERGE;
 447
 448                 /*
 449                  * For any refs that we happen to be fetching via
 450                  * command-line arguments, the destination ref might
 451                  * have been missing or have been different than the
 452                  * remote-tracking ref that would be derived from the
 453                  * configured refspec.  In these cases, we want to
 454                  * take the opportunity to update their configured
 455                  * remote-tracking reference.  However, we do not want
 456                  * to mention these entries in FETCH_HEAD at all, as
 457                  * they would simply be duplicates of existing
 458                  * entries, so we set them FETCH_HEAD_IGNORE below.
 459                  *
 460                  * We compute these entries now, based only on the
 461                  * refspecs specified on the command line.  But we add
 462                  * them to the list following the refspecs resulting
 463                  * from the tags option so that one of the latter,
 464                  * which has FETCH_HEAD_NOT_FOR_MERGE, is not removed
 465                  * by ref_remove_duplicates() in favor of one of these
 466                  * opportunistic entries with FETCH_HEAD_IGNORE.
 467                  */
 468                 if (refmap.nr)
 469                         fetch_refspec = &refmap;
 470                 else
 471                         fetch_refspec = &remote->fetch;
 472
 473                 for (i = 0; i < fetch_refspec->nr; i++)
 474                         get_fetch_map(ref_map, &fetch_refspec->items[i], &oref_tail, 1);
 475         } else if (refmap.nr) {
 476                 die("--refmap option is only meaningful with command-line refspec(s).");
 477         } else {
 478                 /* Use the defaults */
 479                 struct branch *branch = branch_get(NULL);
 480                 int has_merge = branch_has_merge_config(branch);
 481                 if (remote &&
 482                     (remote->fetch.nr ||
 483                      /* Note: has_merge implies non-NULL branch->remote_name */
 484                      (has_merge && !strcmp(branch->remote_name, remote->name)))) {
 485                         for (i = 0; i < remote->fetch.nr; i++) {
 486                                 get_fetch_map(remote_refs, &remote->fetch.items[i], &tail, 0);
 487                                 if (remote->fetch.items[i].dst &&
 488                                     remote->fetch.items[i].dst[0])
 489                                         *autotags = 1;
 490                                 if (!i && !has_merge && ref_map &&
 491                                     !remote->fetch.items[0].pattern)
 492                                         ref_map->fetch_head_status = FETCH_HEAD_MERGE;
 493                         }
 494                         /*
 495                          * if the remote we're fetching from is the same
 496                          * as given in branch.<name>.remote, we add the
 497                          * ref given in branch.<name>.merge, too.
 498                          *
 499                          * Note: has_merge implies non-NULL branch->remote_name
 500                          */
 501                         if (has_merge &&
 502                             !strcmp(branch->remote_name, remote->name))
 503                                 add_merge_config(&ref_map, remote_refs, branch, &tail);
 504                 } else {
 505                         ref_map = get_remote_ref(remote_refs, "HEAD");
 506                         if (!ref_map)
 507                                 die(_("Couldn't find remote ref HEAD"));
 508                         ref_map->fetch_head_status = FETCH_HEAD_MERGE;
 509                         tail = &ref_map->next;
 510                 }
 511         }
 512
 513         if (tags == TAGS_SET)
 514                 /* also fetch all tags */
 515                 get_fetch_map(remote_refs, tag_refspec, &tail, 0);
 516         else if (tags == TAGS_DEFAULT && *autotags)
 517                 find_non_local_tags(remote_refs, &ref_map, &tail);
 518
 519         /* Now append any refs to be updated opportunistically: */
 520         *tail = orefs;
 521         for (rm = orefs; rm; rm = rm->next) {
 522                 rm->fetch_head_status = FETCH_HEAD_IGNORE;
 523                 tail = &rm->next;
 524         }
 525
 526         ref_map = ref_remove_duplicates(ref_map);
 527
 528         refname_hash_init(&existing_refs);
 529         for_each_ref(add_one_refname, &existing_refs);
 530
 531         for (rm = ref_map; rm; rm = rm->next) {
 532                 if (rm->peer_ref) {
 533                         const char *refname = rm->peer_ref->name;
 534                         struct refname_hash_entry *peer_item;
 535
 536                         peer_item = hashmap_get_from_hash(&existing_refs,
 537                                                           strhash(refname),
 538                                                           refname);
 539                         if (peer_item) {
 540                                 struct object_id *old_oid = &peer_item->oid;
 541                                 oidcpy(&rm->peer_ref->old_oid, old_oid);
 542                         }
 543                 }
 544         }
 545         hashmap_free(&existing_refs, 1);
 546
 547         return ref_map;
 548 }
 549
 550 #define STORE_REF_ERROR_OTHER 1
 551 #define STORE_REF_ERROR_DF_CONFLICT 2
 552
 553 static int s_update_ref(const char *action,
 554                         struct ref *ref,
 555                         int check_old)
 556 {
 557         char *msg;
 558         char *rla = getenv("GIT_REFLOG_ACTION");
 559         struct ref_transaction *transaction;
 560         struct strbuf err = STRBUF_INIT;
 561         int ret, df_conflict = 0;
 562
 563         if (dry_run)
 564                 return 0;
 565         if (!rla)
 566                 rla = default_rla.buf;
 567         msg = xstrfmt("%s: %s", rla, action);
 568
 569         transaction = ref_transaction_begin(&err);
 570         if (!transaction ||
 571             ref_transaction_update(transaction, ref->name,
 572                                    &ref->new_oid,
 573                                    check_old ? &ref->old_oid : NULL,
 574                                    0, msg, &err))
 575                 goto fail;
 576
 577         ret = ref_transaction_commit(transaction, &err);
 578         if (ret) {
 579                 df_conflict = (ret == TRANSACTION_NAME_CONFLICT);
 580                 goto fail;
 581         }
 582
 583         ref_transaction_free(transaction);
 584         strbuf_release(&err);
 585         free(msg);
 586         return 0;
 587 fail:
 588         ref_transaction_free(transaction);
 589         error("%s", err.buf);
 590         strbuf_release(&err);
 591         free(msg);
 592         return df_conflict ? STORE_REF_ERROR_DF_CONFLICT
 593                            : STORE_REF_ERROR_OTHER;
 594 }
 595
 596 static int refcol_width = 10;
 597 static int compact_format;
 598
 599 static void adjust_refcol_width(const struct ref *ref)
 600 {
 601         int max, rlen, llen, len;
 602
 603         /* uptodate lines are only shown on high verbosity level */
 604         if (!verbosity && oideq(&ref->peer_ref->old_oid, &ref->old_oid))
 605                 return;
 606
 607         max    = term_columns();
 608         rlen   = utf8_strwidth(prettify_refname(ref->name));
 609
 610         llen   = utf8_strwidth(prettify_refname(ref->peer_ref->name));
 611
 612         /*
 613          * rough estimation to see if the output line is too long and
 614          * should not be counted (we can't do precise calculation
 615          * anyway because we don't know if the error explanation part
 616          * will be printed in update_local_ref)
 617          */
 618         if (compact_format) {
 619                 llen = 0;
 620                 max = max * 2 / 3;
 621         }
 622         len = 21 /* flag and summary */ + rlen + 4 /* -> */ + llen;
 623         if (len >= max)
 624                 return;
 625
 626         /*
 627          * Not precise calculation for compact mode because '*' can
 628          * appear on the left hand side of '->' and shrink the column
 629          * back.
 630          */
 631         if (refcol_width < rlen)
 632                 refcol_width = rlen;
 633 }
 634
 635 static void prepare_format_display(struct ref *ref_map)
 636 {
 637         struct ref *rm;
 638         const char *format = "full";
 639
 640         git_config_get_string_const("fetch.output", &format);
 641         if (!strcasecmp(format, "full"))
 642                 compact_format = 0;
 643         else if (!strcasecmp(format, "compact"))
 644                 compact_format = 1;
 645         else
 646                 die(_("configuration fetch.output contains invalid value %s"),
 647                     format);
 648
 649         for (rm = ref_map; rm; rm = rm->next) {
 650                 if (rm->status == REF_STATUS_REJECT_SHALLOW ||
 651                     !rm->peer_ref ||
 652                     !strcmp(rm->name, "HEAD"))
 653                         continue;
 654
 655                 adjust_refcol_width(rm);
 656         }
 657 }
 658
 659 static void print_remote_to_local(struct strbuf *display,
 660                                   const char *remote, const char *local)
 661 {
 662         strbuf_addf(display, "%-*s -> %s", refcol_width, remote, local);
 663 }
 664
 665 static int find_and_replace(struct strbuf *haystack,
 666                             const char *needle,
 667                             const char *placeholder)
 668 {
 669         const char *p = NULL;
 670         int plen, nlen;
 671
 672         nlen = strlen(needle);
 673         if (ends_with(haystack->buf, needle))
 674                 p = haystack->buf + haystack->len - nlen;
 675         else
 676                 p = strstr(haystack->buf, needle);
 677         if (!p)
 678                 return 0;
 679
 680         if (p > haystack->buf && p[-1] != '/')
 681                 return 0;
 682
 683         plen = strlen(p);
 684         if (plen > nlen && p[nlen] != '/')
 685                 return 0;
 686
 687         strbuf_splice(haystack, p - haystack->buf, nlen,
 688                       placeholder, strlen(placeholder));
 689         return 1;
 690 }
 691
 692 static void print_compact(struct strbuf *display,
 693                           const char *remote, const char *local)
 694 {
 695         struct strbuf r = STRBUF_INIT;
 696         struct strbuf l = STRBUF_INIT;
 697
 698         if (!strcmp(remote, local)) {
 699                 strbuf_addf(display, "%-*s -> *", refcol_width, remote);
 700                 return;
 701         }
 702
 703         strbuf_addstr(&r, remote);
 704         strbuf_addstr(&l, local);
 705
 706         if (!find_and_replace(&r, local, "*"))
 707                 find_and_replace(&l, remote, "*");
 708         print_remote_to_local(display, r.buf, l.buf);
 709
 710         strbuf_release(&r);
 711         strbuf_release(&l);
 712 }
 713
 714 static void format_display(struct strbuf *display, char code,
 715                            const char *summary, const char *error,
 716                            const char *remote, const char *local,
 717                            int summary_width)
 718 {
 719         int width = (summary_width + strlen(summary) - gettext_width(summary));
 720
 721         strbuf_addf(display, "%c %-*s ", code, width, summary);
 722         if (!compact_format)
 723                 print_remote_to_local(display, remote, local);
 724         else
 725                 print_compact(display, remote, local);
 726         if (error)
 727                 strbuf_addf(display, "  (%s)", error);
 728 }
 729
 730 static int update_local_ref(struct ref *ref,
 731                             const char *remote,
 732                             const struct ref *remote_ref,
 733                             struct strbuf *display,
 734                             int summary_width)
 735 {
 736         struct commit *current = NULL, *updated;
 737         enum object_type type;
 738         struct branch *current_branch = branch_get(NULL);
 739         const char *pretty_ref = prettify_refname(ref->name);
 740         int fast_forward = 0;
 741
 742         type = oid_object_info(the_repository, &ref->new_oid, NULL);
 743         if (type < 0)
 744                 die(_("object %s not found"), oid_to_hex(&ref->new_oid));
 745
 746         if (oideq(&ref->old_oid, &ref->new_oid)) {
 747                 if (verbosity > 0)
 748                         format_display(display, '=', _("[up to date]"), NULL,
 749                                        remote, pretty_ref, summary_width);
 750                 return 0;
 751         }
 752
 753         if (current_branch &&
 754             !strcmp(ref->name, current_branch->name) &&
 755             !(update_head_ok || is_bare_repository()) &&
 756             !is_null_oid(&ref->old_oid)) {
 757                 /*
 758                  * If this is the head, and it's not okay to update
 759                  * the head, and the old value of the head isn't empty...
 760                  */
 761                 format_display(display, '!', _("[rejected]"),
 762                                _("can't fetch in current branch"),
 763                                remote, pretty_ref, summary_width);
 764                 return 1;
 765         }
 766
 767         if (!is_null_oid(&ref->old_oid) &&
 768             starts_with(ref->name, "refs/tags/")) {
 769                 if (force || ref->force) {
 770                         int r;
 771                         r = s_update_ref("updating tag", ref, 0);
 772                         format_display(display, r ? '!' : 't', _("[tag update]"),
 773                                        r ? _("unable to update local ref") : NULL,
 774                                        remote, pretty_ref, summary_width);
 775                         return r;
 776                 } else {
 777                         format_display(display, '!', _("[rejected]"), _("would clobber existing tag"),
 778                                        remote, pretty_ref, summary_width);
 779                         return 1;
 780                 }
 781         }
 782
 783         current = lookup_commit_reference_gently(the_repository,
 784                                                  &ref->old_oid, 1);
 785         updated = lookup_commit_reference_gently(the_repository,
 786                                                  &ref->new_oid, 1);
 787         if (!current || !updated) {
 788                 const char *msg;
 789                 const char *what;
 790                 int r;
 791                 /*
 792                  * Nicely describe the new ref we're fetching.
 793                  * Base this on the remote's ref name, as it's
 794                  * more likely to follow a standard layout.
 795                  */
 796                 const char *name = remote_ref ? remote_ref->name : "";
 797                 if (starts_with(name, "refs/tags/")) {
 798                         msg = "storing tag";
 799                         what = _("[new tag]");
 800                 } else if (starts_with(name, "refs/heads/")) {
 801                         msg = "storing head";
 802                         what = _("[new branch]");
 803                 } else {
 804                         msg = "storing ref";
 805                         what = _("[new ref]");
 806                 }
 807
 808                 r = s_update_ref(msg, ref, 0);
 809                 format_display(display, r ? '!' : '*', what,
 810                                r ? _("unable to update local ref") : NULL,
 811                                remote, pretty_ref, summary_width);
 812                 return r;
 813         }
 814
 815         if (fetch_show_forced_updates) {
 816                 uint64_t t_before = getnanotime();
 817                 fast_forward = in_merge_bases(current, updated);
 818                 forced_updates_ms += (getnanotime() - t_before) / 1000000;
 819         } else {
 820                 fast_forward = 1;
 821         }
 822
 823         if (fast_forward) {
 824                 struct strbuf quickref = STRBUF_INIT;
 825                 int r;
 826
 827                 strbuf_add_unique_abbrev(&quickref, &current->object.oid, DEFAULT_ABBREV);
 828                 strbuf_addstr(&quickref, "..");
 829                 strbuf_add_unique_abbrev(&quickref, &ref->new_oid, DEFAULT_ABBREV);
 830                 r = s_update_ref("fast-forward", ref, 1);
 831                 format_display(display, r ? '!' : ' ', quickref.buf,
 832                                r ? _("unable to update local ref") : NULL,
 833                                remote, pretty_ref, summary_width);
 834                 strbuf_release(&quickref);
 835                 return r;
 836         } else if (force || ref->force) {
 837                 struct strbuf quickref = STRBUF_INIT;
 838                 int r;
 839                 strbuf_add_unique_abbrev(&quickref, &current->object.oid, DEFAULT_ABBREV);
 840                 strbuf_addstr(&quickref, "...");
 841                 strbuf_add_unique_abbrev(&quickref, &ref->new_oid, DEFAULT_ABBREV);
 842                 r = s_update_ref("forced-update", ref, 1);
 843                 format_display(display, r ? '!' : '+', quickref.buf,
 844                                r ? _("unable to update local ref") : _("forced update"),
 845                                remote, pretty_ref, summary_width);
 846                 strbuf_release(&quickref);
 847                 return r;
 848         } else {
 849                 format_display(display, '!', _("[rejected]"), _("non-fast-forward"),
 850                                remote, pretty_ref, summary_width);
 851                 return 1;
 852         }
 853 }
 854
 855 static int iterate_ref_map(void *cb_data, struct object_id *oid)
 856 {
 857         struct ref **rm = cb_data;
 858         struct ref *ref = *rm;
 859
 860         while (ref && ref->status == REF_STATUS_REJECT_SHALLOW)
 861                 ref = ref->next;
 862         if (!ref)
 863                 return -1; /* end of the list */
 864         *rm = ref->next;
 865         oidcpy(oid, &ref->old_oid);
 866         return 0;
 867 }
 868
 869 static const char warn_show_forced_updates[] =
 870 N_("Fetch normally indicates which branches had a forced update,\n"
 871    "but that check has been disabled. To re-enable, use '--show-forced-updates'\n"
 872    "flag or run 'git config fetch.showForcedUpdates true'.");
 873 static const char warn_time_show_forced_updates[] =
 874 N_("It took %.2f seconds to check forced updates. You can use\n"
 875    "'--no-show-forced-updates' or run 'git config fetch.showForcedUpdates false'\n"
 876    " to avoid this check.\n");
 877
 878 static int store_updated_refs(const char *raw_url, const char *remote_name,
 879                               int connectivity_checked, struct ref *ref_map)
 880 {
 881         FILE *fp;
 882         struct commit *commit;
 883         int url_len, i, rc = 0;
 884         struct strbuf note = STRBUF_INIT;
 885         const char *what, *kind;
 886         struct ref *rm;
 887         char *url;
 888         const char *filename = dry_run ? "/dev/null" : git_path_fetch_head(the_repository);
 889         int want_status;
 890         int summary_width = transport_summary_width(ref_map);
 891
 892         fp = fopen(filename, "a");
 893         if (!fp)
 894                 return error_errno(_("cannot open %s"), filename);
 895
 896         if (raw_url)
 897                 url = transport_anonymize_url(raw_url);
 898         else
 899                 url = xstrdup("foreign");
 900
 901         if (!connectivity_checked) {
 902                 rm = ref_map;
 903                 if (check_connected(iterate_ref_map, &rm, NULL)) {
 904                         rc = error(_("%s did not send all necessary objects\n"), url);
 905                         goto abort;
 906                 }
 907         }
 908
 909         prepare_format_display(ref_map);
 910
 911         /*
 912          * We do a pass for each fetch_head_status type in their enum order, so
 913          * merged entries are written before not-for-merge. That lets readers
 914          * use FETCH_HEAD as a refname to refer to the ref to be merged.
 915          */
 916         for (want_status = FETCH_HEAD_MERGE;
 917              want_status <= FETCH_HEAD_IGNORE;
 918              want_status++) {
 919                 for (rm = ref_map; rm; rm = rm->next) {
 920                         struct ref *ref = NULL;
 921                         const char *merge_status_marker = "";
 922
 923                         if (rm->status == REF_STATUS_REJECT_SHALLOW) {
 924                                 if (want_status == FETCH_HEAD_MERGE)
 925                                         warning(_("reject %s because shallow roots are not allowed to be updated"),
 926                                                 rm->peer_ref ? rm->peer_ref->name : rm->name);
 927                                 continue;
 928                         }
 929
 930                         commit = lookup_commit_reference_gently(the_repository,
 931                                                                 &rm->old_oid,
 932                                                                 1);
 933                         if (!commit)
 934                                 rm->fetch_head_status = FETCH_HEAD_NOT_FOR_MERGE;
 935
 936                         if (rm->fetch_head_status != want_status)
 937                                 continue;
 938
 939                         if (rm->peer_ref) {
 940                                 ref = alloc_ref(rm->peer_ref->name);
 941                                 oidcpy(&ref->old_oid, &rm->peer_ref->old_oid);
 942                                 oidcpy(&ref->new_oid, &rm->old_oid);
 943                                 ref->force = rm->peer_ref->force;
 944                         }
 945
 946                         if (recurse_submodules != RECURSE_SUBMODULES_OFF)
 947                                 check_for_new_submodule_commits(&rm->old_oid);
 948
 949                         if (!strcmp(rm->name, "HEAD")) {
 950                                 kind = "";
 951                                 what = "";
 952                         }
 953                         else if (starts_with(rm->name, "refs/heads/")) {
 954                                 kind = "branch";
 955                                 what = rm->name + 11;
 956                         }
 957                         else if (starts_with(rm->name, "refs/tags/")) {
 958                                 kind = "tag";
 959                                 what = rm->name + 10;
 960                         }
 961                         else if (starts_with(rm->name, "refs/remotes/")) {
 962                                 kind = "remote-tracking branch";
 963                                 what = rm->name + 13;
 964                         }
 965                         else {
 966                                 kind = "";
 967                                 what = rm->name;
 968                         }
 969
 970                         url_len = strlen(url);
 971                         for (i = url_len - 1; url[i] == '/' && 0 <= i; i--)
 972                                 ;
 973                         url_len = i + 1;
 974                         if (4 < i && !strncmp(".git", url + i - 3, 4))
 975                                 url_len = i - 3;
 976
 977                         strbuf_reset(&note);
 978                         if (*what) {
 979                                 if (*kind)
 980                                         strbuf_addf(&note, "%s ", kind);
 981                                 strbuf_addf(&note, "'%s' of ", what);
 982                         }
 983                         switch (rm->fetch_head_status) {
 984                         case FETCH_HEAD_NOT_FOR_MERGE:
 985                                 merge_status_marker = "not-for-merge";
 986                                 /* fall-through */
 987                         case FETCH_HEAD_MERGE:
 988                                 fprintf(fp, "%s\t%s\t%s",
 989                                         oid_to_hex(&rm->old_oid),
 990                                         merge_status_marker,
 991                                         note.buf);
 992                                 for (i = 0; i < url_len; ++i)
 993                                         if ('\n' == url[i])
 994                                                 fputs("\\n", fp);
 995                                         else
 996                                                 fputc(url[i], fp);
 997                                 fputc('\n', fp);
 998                                 break;
 999                         default:
1000                                 /* do not write anything to FETCH_HEAD */
1001                                 break;
1002                         }
1003
1004                         strbuf_reset(&note);
1005                         if (ref) {
1006                                 rc |= update_local_ref(ref, what, rm, &note,
1007                                                        summary_width);
1008                                 free(ref);
1009                         } else
1010                                 format_display(&note, '*',
1011                                                *kind ? kind : "branch", NULL,
1012                                                *what ? what : "HEAD",
1013                                                "FETCH_HEAD", summary_width);
1014                         if (note.len) {
1015                                 if (verbosity >= 0 && !shown_url) {
1016                                         fprintf(stderr, _("From %.*s\n"),
1017                                                         url_len, url);
1018                                         shown_url = 1;
1019                                 }
1020                                 if (verbosity >= 0)
1021                                         fprintf(stderr, " %s\n", note.buf);
1022                         }
1023                 }
1024         }
1025
1026         if (rc & STORE_REF_ERROR_DF_CONFLICT)
1027                 error(_("some local refs could not be updated; try running\n"
1028                       " 'git remote prune %s' to remove any old, conflicting "
1029                       "branches"), remote_name);
1030
1031         if (advice_fetch_show_forced_updates) {
1032                 if (!fetch_show_forced_updates) {
1033                         warning(_(warn_show_forced_updates));
1034                 } else if (forced_updates_ms > FORCED_UPDATES_DELAY_WARNING_IN_MS) {
1035                         warning(_(warn_time_show_forced_updates),
1036                                 forced_updates_ms / 1000.0);
1037                 }
1038         }
1039
1040  abort:
1041         strbuf_release(&note);
1042         free(url);
1043         fclose(fp);
1044         return rc;
1045 }
1046
1047 /*
1048  * We would want to bypass the object transfer altogether if
1049  * everything we are going to fetch already exists and is connected
1050  * locally.
1051  */
1052 static int check_exist_and_connected(struct ref *ref_map)
1053 {
1054         struct ref *rm = ref_map;
1055         struct check_connected_options opt = CHECK_CONNECTED_INIT;
1056         struct ref *r;
1057
1058         /*
1059          * If we are deepening a shallow clone we already have these
1060          * objects reachable.  Running rev-list here will return with
1061          * a good (0) exit status and we'll bypass the fetch that we
1062          * really need to perform.  Claiming failure now will ensure
1063          * we perform the network exchange to deepen our history.
1064          */
1065         if (deepen)
1066                 return -1;
1067
1068         /*
1069          * check_connected() allows objects to merely be promised, but
1070          * we need all direct targets to exist.
1071          */
1072         for (r = rm; r; r = r->next) {
1073                 if (!has_object_file(&r->old_oid))
1074                         return -1;
1075         }
1076
1077         opt.quiet = 1;
1078         return check_connected(iterate_ref_map, &rm, &opt);
1079 }
1080
1081 static int fetch_refs(struct transport *transport, struct ref *ref_map)
1082 {
1083         int ret = check_exist_and_connected(ref_map);
1084         if (ret)
1085                 ret = transport_fetch_refs(transport, ref_map);
1086         if (!ret)
1087                 /*
1088                  * Keep the new pack's ".keep" file around to allow the caller
1089                  * time to update refs to reference the new objects.
1090                  */
1091                 return 0;
1092         transport_unlock_pack(transport);
1093         return ret;
1094 }
1095
1096 /* Update local refs based on the ref values fetched from a remote */
1097 static int consume_refs(struct transport *transport, struct ref *ref_map)
1098 {
1099         int connectivity_checked = transport->smart_options
1100                 ? transport->smart_options->connectivity_checked : 0;
1101         int ret = store_updated_refs(transport->url,
1102                                      transport->remote->name,
1103                                      connectivity_checked,
1104                                      ref_map);
1105         transport_unlock_pack(transport);
1106         return ret;
1107 }
1108
1109 static int prune_refs(struct refspec *rs, struct ref *ref_map,
1110                       const char *raw_url)
1111 {
1112         int url_len, i, result = 0;
1113         struct ref *ref, *stale_refs = get_stale_heads(rs, ref_map);
1114         char *url;
1115         int summary_width = transport_summary_width(stale_refs);
1116         const char *dangling_msg = dry_run
1117                 ? _("   (%s will become dangling)")
1118                 : _("   (%s has become dangling)");
1119
1120         if (raw_url)
1121                 url = transport_anonymize_url(raw_url);
1122         else
1123                 url = xstrdup("foreign");
1124
1125         url_len = strlen(url);
1126         for (i = url_len - 1; url[i] == '/' && 0 <= i; i--)
1127                 ;
1128
1129         url_len = i + 1;
1130         if (4 < i && !strncmp(".git", url + i - 3, 4))
1131                 url_len = i - 3;
1132
1133         if (!dry_run) {
1134                 struct string_list refnames = STRING_LIST_INIT_NODUP;
1135
1136                 for (ref = stale_refs; ref; ref = ref->next)
1137                         string_list_append(&refnames, ref->name);
1138
1139                 result = delete_refs("fetch: prune", &refnames, 0);
1140                 string_list_clear(&refnames, 0);
1141         }
1142
1143         if (verbosity >= 0) {
1144                 for (ref = stale_refs; ref; ref = ref->next) {
1145                         struct strbuf sb = STRBUF_INIT;
1146                         if (!shown_url) {
1147                                 fprintf(stderr, _("From %.*s\n"), url_len, url);
1148                                 shown_url = 1;
1149                         }
1150                         format_display(&sb, '-', _("[deleted]"), NULL,
1151                                        _("(none)"), prettify_refname(ref->name),
1152                                        summary_width);
1153                         fprintf(stderr, " %s\n",sb.buf);
1154                         strbuf_release(&sb);
1155                         warn_dangling_symref(stderr, dangling_msg, ref->name);
1156                 }
1157         }
1158
1159         free(url);
1160         free_refs(stale_refs);
1161         return result;
1162 }
1163
1164 static void check_not_current_branch(struct ref *ref_map)
1165 {
1166         struct branch *current_branch = branch_get(NULL);
1167
1168         if (is_bare_repository() || !current_branch)
1169                 return;
1170
1171         for (; ref_map; ref_map = ref_map->next)
1172                 if (ref_map->peer_ref && !strcmp(current_branch->refname,
1173                                         ref_map->peer_ref->name))
1174                         die(_("Refusing to fetch into current branch %s "
1175                             "of non-bare repository"), current_branch->refname);
1176 }
1177
1178 static int truncate_fetch_head(void)
1179 {
1180         const char *filename = git_path_fetch_head(the_repository);
1181         FILE *fp = fopen_for_writing(filename);
1182
1183         if (!fp)
1184                 return error_errno(_("cannot open %s"), filename);
1185         fclose(fp);
1186         return 0;
1187 }
1188
1189 static void set_option(struct transport *transport, const char *name, const char *value)
1190 {
1191         int r = transport_set_option(transport, name, value);
1192         if (r < 0)
1193                 die(_("Option \"%s\" value \"%s\" is not valid for %s"),
1194                     name, value, transport->url);
1195         if (r > 0)
1196                 warning(_("Option \"%s\" is ignored for %s\n"),
1197                         name, transport->url);
1198 }
1199
1200
1201 static int add_oid(const char *refname, const struct object_id *oid, int flags,
1202                    void *cb_data)
1203 {
1204         struct oid_array *oids = cb_data;
1205
1206         oid_array_append(oids, oid);
1207         return 0;
1208 }
1209
1210 static void add_negotiation_tips(struct git_transport_options *smart_options)
1211 {
1212         struct oid_array *oids = xcalloc(1, sizeof(*oids));
1213         int i;
1214
1215         for (i = 0; i < negotiation_tip.nr; i++) {
1216                 const char *s = negotiation_tip.items[i].string;
1217                 int old_nr;
1218                 if (!has_glob_specials(s)) {
1219                         struct object_id oid;
1220                         if (get_oid(s, &oid))
1221                                 die("%s is not a valid object", s);
1222                         oid_array_append(oids, &oid);
1223                         continue;
1224                 }
1225                 old_nr = oids->nr;
1226                 for_each_glob_ref(add_oid, s, oids);
1227                 if (old_nr == oids->nr)
1228                         warning("Ignoring --negotiation-tip=%s because it does not match any refs",
1229                                 s);
1230         }
1231         smart_options->negotiation_tips = oids;
1232 }
1233
1234 static struct transport *prepare_transport(struct remote *remote, int deepen)
1235 {
1236         struct transport *transport;
1237
1238         transport = transport_get(remote, NULL);
1239         transport_set_verbosity(transport, verbosity, progress);
1240         transport->family = family;
1241         if (upload_pack)
1242                 set_option(transport, TRANS_OPT_UPLOADPACK, upload_pack);
1243         if (keep)
1244                 set_option(transport, TRANS_OPT_KEEP, "yes");
1245         if (depth)
1246                 set_option(transport, TRANS_OPT_DEPTH, depth);
1247         if (deepen && deepen_since)
1248                 set_option(transport, TRANS_OPT_DEEPEN_SINCE, deepen_since);
1249         if (deepen && deepen_not.nr)
1250                 set_option(transport, TRANS_OPT_DEEPEN_NOT,
1251                            (const char *)&deepen_not);
1252         if (deepen_relative)
1253                 set_option(transport, TRANS_OPT_DEEPEN_RELATIVE, "yes");
1254         if (update_shallow)
1255                 set_option(transport, TRANS_OPT_UPDATE_SHALLOW, "yes");
1256         if (filter_options.choice) {
1257                 const char *spec =
1258                         expand_list_objects_filter_spec(&filter_options);
1259                 set_option(transport, TRANS_OPT_LIST_OBJECTS_FILTER, spec);
1260                 set_option(transport, TRANS_OPT_FROM_PROMISOR, "1");
1261         }
1262         if (negotiation_tip.nr) {
1263                 if (transport->smart_options)
1264                         add_negotiation_tips(transport->smart_options);
1265                 else
1266                         warning("Ignoring --negotiation-tip because the protocol does not support it.");
1267         }
1268         return transport;
1269 }
1270
1271 static void backfill_tags(struct transport *transport, struct ref *ref_map)
1272 {
1273         int cannot_reuse;
1274
1275         /*
1276          * Once we have set TRANS_OPT_DEEPEN_SINCE, we can't unset it
1277          * when remote helper is used (setting it to an empty string
1278          * is not unsetting). We could extend the remote helper
1279          * protocol for that, but for now, just force a new connection
1280          * without deepen-since. Similar story for deepen-not.
1281          */
1282         cannot_reuse = transport->cannot_reuse ||
1283                 deepen_since || deepen_not.nr;
1284         if (cannot_reuse) {
1285                 gsecondary = prepare_transport(transport->remote, 0);
1286                 transport = gsecondary;
1287         }
1288
1289         transport_set_option(transport, TRANS_OPT_FOLLOWTAGS, NULL);
1290         transport_set_option(transport, TRANS_OPT_DEPTH, "0");
1291         transport_set_option(transport, TRANS_OPT_DEEPEN_RELATIVE, NULL);
1292         if (!fetch_refs(transport, ref_map))
1293                 consume_refs(transport, ref_map);
1294
1295         if (gsecondary) {
1296                 transport_disconnect(gsecondary);
1297                 gsecondary = NULL;
1298         }
1299 }
1300
1301 static int do_fetch(struct transport *transport,
1302                     struct refspec *rs)
1303 {
1304         struct ref *ref_map;
1305         int autotags = (transport->remote->fetch_tags == 1);
1306         int retcode = 0;
1307         const struct ref *remote_refs;
1308         struct argv_array ref_prefixes = ARGV_ARRAY_INIT;
1309         int must_list_refs = 1;
1310
1311         if (tags == TAGS_DEFAULT) {
1312                 if (transport->remote->fetch_tags == 2)
1313                         tags = TAGS_SET;
1314                 if (transport->remote->fetch_tags == -1)
1315                         tags = TAGS_UNSET;
1316         }
1317
1318         /* if not appending, truncate FETCH_HEAD */
1319         if (!append && !dry_run) {
1320                 retcode = truncate_fetch_head();
1321                 if (retcode)
1322                         goto cleanup;
1323         }
1324
1325         if (rs->nr) {
1326                 int i;
1327
1328                 refspec_ref_prefixes(rs, &ref_prefixes);
1329
1330                 /*
1331                  * We can avoid listing refs if all of them are exact
1332                  * OIDs
1333                  */
1334                 must_list_refs = 0;
1335                 for (i = 0; i < rs->nr; i++) {
1336                         if (!rs->items[i].exact_sha1) {
1337                                 must_list_refs = 1;
1338                                 break;
1339                         }
1340                 }
1341         } else if (transport->remote && transport->remote->fetch.nr)
1342                 refspec_ref_prefixes(&transport->remote->fetch, &ref_prefixes);
1343
1344         if (tags == TAGS_SET || tags == TAGS_DEFAULT) {
1345                 must_list_refs = 1;
1346                 if (ref_prefixes.argc)
1347                         argv_array_push(&ref_prefixes, "refs/tags/");
1348         }
1349
1350         if (must_list_refs)
1351                 remote_refs = transport_get_remote_refs(transport, &ref_prefixes);
1352         else
1353                 remote_refs = NULL;
1354
1355         argv_array_clear(&ref_prefixes);
1356
1357         ref_map = get_ref_map(transport->remote, remote_refs, rs,
1358                               tags, &autotags);
1359         if (!update_head_ok)
1360                 check_not_current_branch(ref_map);
1361
1362         if (tags == TAGS_DEFAULT && autotags)
1363                 transport_set_option(transport, TRANS_OPT_FOLLOWTAGS, "1");
1364         if (prune) {
1365                 /*
1366                  * We only prune based on refspecs specified
1367                  * explicitly (via command line or configuration); we
1368                  * don't care whether --tags was specified.
1369                  */
1370                 if (rs->nr) {
1371                         prune_refs(rs, ref_map, transport->url);
1372                 } else {
1373                         prune_refs(&transport->remote->fetch,
1374                                    ref_map,
1375                                    transport->url);
1376                 }
1377         }
1378         if (fetch_refs(transport, ref_map) || consume_refs(transport, ref_map)) {
1379                 free_refs(ref_map);
1380                 retcode = 1;
1381                 goto cleanup;
1382         }
1383
1384         if (set_upstream) {
1385                 struct branch *branch = branch_get("HEAD");
1386                 struct ref *rm;
1387                 struct ref *source_ref = NULL;
1388
1389                 /*
1390                  * We're setting the upstream configuration for the
1391                  * current branch. The relevent upstream is the
1392                  * fetched branch that is meant to be merged with the
1393                  * current one, i.e. the one fetched to FETCH_HEAD.
1394                  *
1395                  * When there are several such branches, consider the
1396                  * request ambiguous and err on the safe side by doing
1397                  * nothing and just emit a warning.
1398                  */
1399                 for (rm = ref_map; rm; rm = rm->next) {
1400                         if (!rm->peer_ref) {
1401                                 if (source_ref) {
1402                                         warning(_("multiple branch detected, incompatible with --set-upstream"));
1403                                         goto skip;
1404                                 } else {
1405                                         source_ref = rm;
1406                                 }
1407                         }
1408                 }
1409                 if (source_ref) {
1410                         if (!strcmp(source_ref->name, "HEAD") ||
1411                             starts_with(source_ref->name, "refs/heads/"))
1412                                 install_branch_config(0,
1413                                                       branch->name,
1414                                                       transport->remote->name,
1415                                                       source_ref->name);
1416                         else if (starts_with(source_ref->name, "refs/remotes/"))
1417                                 warning(_("not setting upstream for a remote remote-tracking branch"));
1418                         else if (starts_with(source_ref->name, "refs/tags/"))
1419                                 warning(_("not setting upstream for a remote tag"));
1420                         else
1421                                 warning(_("unknown branch type"));
1422                 } else {
1423                         warning(_("no source branch found.\n"
1424                                 "you need to specify exactly one branch with the --set-upstream option."));
1425                 }
1426         }
1427  skip:
1428         free_refs(ref_map);
1429
1430         /* if neither --no-tags nor --tags was specified, do automated tag
1431          * following ... */
1432         if (tags == TAGS_DEFAULT && autotags) {
1433                 struct ref **tail = &ref_map;
1434                 ref_map = NULL;
1435                 find_non_local_tags(remote_refs, &ref_map, &tail);
1436                 if (ref_map)
1437                         backfill_tags(transport, ref_map);
1438                 free_refs(ref_map);
1439         }
1440
1441  cleanup:
1442         return retcode;
1443 }
1444
1445 static int get_one_remote_for_fetch(struct remote *remote, void *priv)
1446 {
1447         struct string_list *list = priv;
1448         if (!remote->skip_default_update)
1449                 string_list_append(list, remote->name);
1450         return 0;
1451 }
1452
1453 struct remote_group_data {
1454         const char *name;
1455         struct string_list *list;
1456 };
1457
1458 static int get_remote_group(const char *key, const char *value, void *priv)
1459 {
1460         struct remote_group_data *g = priv;
1461
1462         if (skip_prefix(key, "remotes.", &key) && !strcmp(key, g->name)) {
1463                 /* split list by white space */
1464                 while (*value) {
1465                         size_t wordlen = strcspn(value, " \t\n");
1466
1467                         if (wordlen >= 1)
1468                                 string_list_append_nodup(g->list,
1469                                                    xstrndup(value, wordlen));
1470                         value += wordlen + (value[wordlen] != '\0');
1471                 }
1472         }
1473
1474         return 0;
1475 }
1476
1477 static int add_remote_or_group(const char *name, struct string_list *list)
1478 {
1479         int prev_nr = list->nr;
1480         struct remote_group_data g;
1481         g.name = name; g.list = list;
1482
1483         git_config(get_remote_group, &g);
1484         if (list->nr == prev_nr) {
1485                 struct remote *remote = remote_get(name);
1486                 if (!remote_is_configured(remote, 0))
1487                         return 0;
1488                 string_list_append(list, remote->name);
1489         }
1490         return 1;
1491 }
1492
1493 static void add_options_to_argv(struct argv_array *argv)
1494 {
1495         if (dry_run)
1496                 argv_array_push(argv, "--dry-run");
1497         if (prune != -1)
1498                 argv_array_push(argv, prune ? "--prune" : "--no-prune");
1499         if (prune_tags != -1)
1500                 argv_array_push(argv, prune_tags ? "--prune-tags" : "--no-prune-tags");
1501         if (update_head_ok)
1502                 argv_array_push(argv, "--update-head-ok");
1503         if (force)
1504                 argv_array_push(argv, "--force");
1505         if (keep)
1506                 argv_array_push(argv, "--keep");
1507         if (recurse_submodules == RECURSE_SUBMODULES_ON)
1508                 argv_array_push(argv, "--recurse-submodules");
1509         else if (recurse_submodules == RECURSE_SUBMODULES_ON_DEMAND)
1510                 argv_array_push(argv, "--recurse-submodules=on-demand");
1511         if (tags == TAGS_SET)
1512                 argv_array_push(argv, "--tags");
1513         else if (tags == TAGS_UNSET)
1514                 argv_array_push(argv, "--no-tags");
1515         if (verbosity >= 2)
1516                 argv_array_push(argv, "-v");
1517         if (verbosity >= 1)
1518                 argv_array_push(argv, "-v");
1519         else if (verbosity < 0)
1520                 argv_array_push(argv, "-q");
1521
1522 }
1523
1524 /* Fetch multiple remotes in parallel */
1525
1526 struct parallel_fetch_state {
1527         const char **argv;
1528         struct string_list *remotes;
1529         int next, result;
1530 };
1531
1532 static int fetch_next_remote(struct child_process *cp, struct strbuf *out,
1533                              void *cb, void **task_cb)
1534 {
1535         struct parallel_fetch_state *state = cb;
1536         char *remote;
1537
1538         if (state->next < 0 || state->next >= state->remotes->nr)
1539                 return 0;
1540
1541         remote = state->remotes->items[state->next++].string;
1542         *task_cb = remote;
1543
1544         argv_array_pushv(&cp->args, state->argv);
1545         argv_array_push(&cp->args, remote);
1546         cp->git_cmd = 1;
1547
1548         if (verbosity >= 0)
1549                 printf(_("Fetching %s\n"), remote);
1550
1551         return 1;
1552 }
1553
1554 static int fetch_failed_to_start(struct strbuf *out, void *cb, void *task_cb)
1555 {
1556         struct parallel_fetch_state *state = cb;
1557         const char *remote = task_cb;
1558
1559         state->result = error(_("Could not fetch %s"), remote);
1560
1561         return 0;
1562 }
1563
1564 static int fetch_finished(int result, struct strbuf *out,
1565                           void *cb, void *task_cb)
1566 {
1567         struct parallel_fetch_state *state = cb;
1568         const char *remote = task_cb;
1569
1570         if (result) {
1571                 strbuf_addf(out, _("could not fetch '%s' (exit code: %d)\n"),
1572                             remote, result);
1573                 state->result = -1;
1574         }
1575
1576         return 0;
1577 }
1578
1579 static int fetch_multiple(struct string_list *list, int max_children)
1580 {
1581         int i, result = 0;
1582         struct argv_array argv = ARGV_ARRAY_INIT;
1583
1584         if (!append && !dry_run) {
1585                 int errcode = truncate_fetch_head();
1586                 if (errcode)
1587                         return errcode;
1588         }
1589
1590         argv_array_pushl(&argv, "fetch", "--append", "--no-auto-gc", NULL);
1591         add_options_to_argv(&argv);
1592
1593         if (max_children != 1 && list->nr != 1) {
1594                 struct parallel_fetch_state state = { argv.argv, list, 0, 0 };
1595
1596                 argv_array_push(&argv, "--end-of-options");
1597                 result = run_processes_parallel_tr2(max_children,
1598                                                     &fetch_next_remote,
1599                                                     &fetch_failed_to_start,
1600                                                     &fetch_finished,
1601                                                     &state,
1602                                                     "fetch", "parallel/fetch");
1603
1604                 if (!result)
1605                         result = state.result;
1606         } else
1607                 for (i = 0; i < list->nr; i++) {
1608                         const char *name = list->items[i].string;
1609                         argv_array_push(&argv, name);
1610                         if (verbosity >= 0)
1611                                 printf(_("Fetching %s\n"), name);
1612                         if (run_command_v_opt(argv.argv, RUN_GIT_CMD)) {
1613                                 error(_("Could not fetch %s"), name);
1614                                 result = 1;
1615                         }
1616                         argv_array_pop(&argv);
1617                 }
1618
1619         argv_array_clear(&argv);
1620         return !!result;
1621 }
1622
1623 /*
1624  * Fetching from the promisor remote should use the given filter-spec
1625  * or inherit the default filter-spec from the config.
1626  */
1627 static inline void fetch_one_setup_partial(struct remote *remote)
1628 {
1629         /*
1630          * Explicit --no-filter argument overrides everything, regardless
1631          * of any prior partial clones and fetches.
1632          */
1633         if (filter_options.no_filter)
1634                 return;
1635
1636         /*
1637          * If no prior partial clone/fetch and the current fetch DID NOT
1638          * request a partial-fetch, do a normal fetch.
1639          */
1640         if (!has_promisor_remote() && !filter_options.choice)
1641                 return;
1642
1643         /*
1644          * If this is a partial-fetch request, we enable partial on
1645          * this repo if not already enabled and remember the given
1646          * filter-spec as the default for subsequent fetches to this
1647          * remote.
1648          */
1649         if (filter_options.choice) {
1650                 partial_clone_register(remote->name, &filter_options);
1651                 return;
1652         }
1653
1654         /*
1655          * Do a partial-fetch from the promisor remote using either the
1656          * explicitly given filter-spec or inherit the filter-spec from
1657          * the config.
1658          */
1659         if (!filter_options.choice)
1660                 partial_clone_get_default_filter_spec(&filter_options, remote->name);
1661         return;
1662 }
1663
1664 static int fetch_one(struct remote *remote, int argc, const char **argv, int prune_tags_ok)
1665 {
1666         struct refspec rs = REFSPEC_INIT_FETCH;
1667         int i;
1668         int exit_code;
1669         int maybe_prune_tags;
1670         int remote_via_config = remote_is_configured(remote, 0);
1671
1672         if (!remote)
1673                 die(_("No remote repository specified.  Please, specify either a URL or a\n"
1674                     "remote name from which new revisions should be fetched."));
1675
1676         gtransport = prepare_transport(remote, 1);
1677
1678         if (prune < 0) {
1679                 /* no command line request */
1680                 if (0 <= remote->prune)
1681                         prune = remote->prune;
1682                 else if (0 <= fetch_prune_config)
1683                         prune = fetch_prune_config;
1684                 else
1685                         prune = PRUNE_BY_DEFAULT;
1686         }
1687
1688         if (prune_tags < 0) {
1689                 /* no command line request */
1690                 if (0 <= remote->prune_tags)
1691                         prune_tags = remote->prune_tags;
1692                 else if (0 <= fetch_prune_tags_config)
1693                         prune_tags = fetch_prune_tags_config;
1694                 else
1695                         prune_tags = PRUNE_TAGS_BY_DEFAULT;
1696         }
1697
1698         maybe_prune_tags = prune_tags_ok && prune_tags;
1699         if (maybe_prune_tags && remote_via_config)
1700                 refspec_append(&remote->fetch, TAG_REFSPEC);
1701
1702         if (maybe_prune_tags && (argc || !remote_via_config))
1703                 refspec_append(&rs, TAG_REFSPEC);
1704
1705         for (i = 0; i < argc; i++) {
1706                 if (!strcmp(argv[i], "tag")) {
1707                         char *tag;
1708                         i++;
1709                         if (i >= argc)
1710                                 die(_("You need to specify a tag name."));
1711
1712                         tag = xstrfmt("refs/tags/%s:refs/tags/%s",
1713                                       argv[i], argv[i]);
1714                         refspec_append(&rs, tag);
1715                         free(tag);
1716                 } else {
1717                         refspec_append(&rs, argv[i]);
1718                 }
1719         }
1720
1721         if (server_options.nr)
1722                 gtransport->server_options = &server_options;
1723
1724         sigchain_push_common(unlock_pack_on_signal);
1725         atexit(unlock_pack);
1726         sigchain_push(SIGPIPE, SIG_IGN);
1727         exit_code = do_fetch(gtransport, &rs);
1728         sigchain_pop(SIGPIPE);
1729         refspec_clear(&rs);
1730         transport_disconnect(gtransport);
1731         gtransport = NULL;
1732         return exit_code;
1733 }
1734
1735 int cmd_fetch(int argc, const char **argv, const char *prefix)
1736 {
1737         int i;
1738         struct string_list list = STRING_LIST_INIT_DUP;
1739         struct remote *remote = NULL;
1740         int result = 0;
1741         int prune_tags_ok = 1;
1742         struct argv_array argv_gc_auto = ARGV_ARRAY_INIT;
1743
1744         packet_trace_identity("fetch");
1745
1746         fetch_if_missing = 0;
1747
1748         /* Record the command line for the reflog */
1749         strbuf_addstr(&default_rla, "fetch");
1750         for (i = 1; i < argc; i++)
1751                 strbuf_addf(&default_rla, " %s", argv[i]);
1752
1753         fetch_config_from_gitmodules(&submodule_fetch_jobs_config,
1754                                      &recurse_submodules);
1755         git_config(git_fetch_config, NULL);
1756
1757         argc = parse_options(argc, argv, prefix,
1758                              builtin_fetch_options, builtin_fetch_usage, 0);
1759
1760         if (deepen_relative) {
1761                 if (deepen_relative < 0)
1762                         die(_("Negative depth in --deepen is not supported"));
1763                 if (depth)
1764                         die(_("--deepen and --depth are mutually exclusive"));
1765                 depth = xstrfmt("%d", deepen_relative);
1766         }
1767         if (unshallow) {
1768                 if (depth)
1769                         die(_("--depth and --unshallow cannot be used together"));
1770                 else if (!is_repository_shallow(the_repository))
1771                         die(_("--unshallow on a complete repository does not make sense"));
1772                 else
1773                         depth = xstrfmt("%d", INFINITE_DEPTH);
1774         }
1775
1776         /* no need to be strict, transport_set_option() will validate it again */
1777         if (depth && atoi(depth) < 1)
1778                 die(_("depth %s is not a positive number"), depth);
1779         if (depth || deepen_since || deepen_not.nr)
1780                 deepen = 1;
1781
1782         if (filter_options.choice && !has_promisor_remote())
1783                 die("--filter can only be used when extensions.partialClone is set");
1784
1785         if (all) {
1786                 if (argc == 1)
1787                         die(_("fetch --all does not take a repository argument"));
1788                 else if (argc > 1)
1789                         die(_("fetch --all does not make sense with refspecs"));
1790                 (void) for_each_remote(get_one_remote_for_fetch, &list);
1791         } else if (argc == 0) {
1792                 /* No arguments -- use default remote */
1793                 remote = remote_get(NULL);
1794         } else if (multiple) {
1795                 /* All arguments are assumed to be remotes or groups */
1796                 for (i = 0; i < argc; i++)
1797                         if (!add_remote_or_group(argv[i], &list))
1798                                 die(_("No such remote or remote group: %s"), argv[i]);
1799         } else {
1800                 /* Single remote or group */
1801                 (void) add_remote_or_group(argv[0], &list);
1802                 if (list.nr > 1) {
1803                         /* More than one remote */
1804                         if (argc > 1)
1805                                 die(_("Fetching a group and specifying refspecs does not make sense"));
1806                 } else {
1807                         /* Zero or one remotes */
1808                         remote = remote_get(argv[0]);
1809                         prune_tags_ok = (argc == 1);
1810                         argc--;
1811                         argv++;
1812                 }
1813         }
1814
1815         if (remote) {
1816                 if (filter_options.choice || has_promisor_remote())
1817                         fetch_one_setup_partial(remote);
1818                 result = fetch_one(remote, argc, argv, prune_tags_ok);
1819         } else {
1820                 int max_children = max_jobs;
1821
1822                 if (filter_options.choice)
1823                         die(_("--filter can only be used with the remote "
1824                               "configured in extensions.partialclone"));
1825
1826                 if (max_children < 0)
1827                         max_children = fetch_parallel_config;
1828
1829                 /* TODO should this also die if we have a previous partial-clone? */
1830                 result = fetch_multiple(&list, max_children);
1831         }
1832
1833         if (!result && (recurse_submodules != RECURSE_SUBMODULES_OFF)) {
1834                 struct argv_array options = ARGV_ARRAY_INIT;
1835                 int max_children = max_jobs;
1836
1837                 if (max_children < 0)
1838                         max_children = submodule_fetch_jobs_config;
1839                 if (max_children < 0)
1840                         max_children = fetch_parallel_config;
1841
1842                 add_options_to_argv(&options);
1843                 result = fetch_populated_submodules(the_repository,
1844                                                     &options,
1845                                                     submodule_prefix,
1846                                                     recurse_submodules,
1847                                                     recurse_submodules_default,
1848                                                     verbosity < 0,
1849                                                     max_children);
1850                 argv_array_clear(&options);
1851         }
1852
1853         string_list_clear(&list, 0);
1854
1855         prepare_repo_settings(the_repository);
1856         if (the_repository->settings.fetch_write_commit_graph) {
1857                 int commit_graph_flags = COMMIT_GRAPH_WRITE_SPLIT;
1858                 struct split_commit_graph_opts split_opts;
1859                 memset(&split_opts, 0, sizeof(struct split_commit_graph_opts));
1860
1861                 if (progress)
1862                         commit_graph_flags |= COMMIT_GRAPH_WRITE_PROGRESS;
1863
1864                 write_commit_graph_reachable(get_object_directory(),
1865                                              commit_graph_flags,
1866                                              &split_opts);
1867         }
1868
1869         close_object_store(the_repository->objects);
1870
1871         if (enable_auto_gc) {
1872                 argv_array_pushl(&argv_gc_auto, "gc", "--auto", NULL);
1873                 if (verbosity < 0)
1874                         argv_array_push(&argv_gc_auto, "--quiet");
1875                 run_command_v_opt(argv_gc_auto.argv, RUN_GIT_CMD);
1876                 argv_array_clear(&argv_gc_auto);
1877         }
1878
1879         return result;
1880 }