builtin/fetch.c

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