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