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