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 "commit.h"
  11 #include "builtin.h"
  12 #include "string-list.h"
  13 #include "remote.h"
  14 #include "transport.h"
  15 #include "run-command.h"
  16 #include "parse-options.h"
  17 #include "sigchain.h"
  18 #include "submodule-config.h"
  19 #include "submodule.h"
  20 #include "connected.h"
  21 #include "argv-array.h"
  22 #include "utf8.h"
  23 #include "packfile.h"
  24 #include "list-objects-filter-options.h"
  25 #include "commit-reach.h"
  26
  27 #define FORCED_UPDATES_DELAY_WARNING_IN_MS (10 * 1000)
  28
  29 static const char * const builtin_fetch_usage[] = {
  30         N_("git fetch [<options>] [<repository> [<refspec>...]]"),
  31         N_("git fetch [<options>] <group>"),
  32         N_("git fetch --multiple [<options>] [(<repository> | <group>)...]"),
  33         N_("git fetch --all [<options>]"),
  34         NULL
  35 };
  36
  37 enum {
  38         TAGS_UNSET = 0,
  39         TAGS_DEFAULT = 1,
  40         TAGS_SET = 2
  41 };
  42
  43 static int fetch_prune_config = -1; /* unspecified */
  44 static int fetch_show_forced_updates = 1;
  45 static uint64_t forced_updates_ms = 0;
  46 static int prune = -1; /* unspecified */
  47 #define PRUNE_BY_DEFAULT 0 /* do we prune by default? */
  48
  49 static int fetch_prune_tags_config = -1; /* unspecified */
  50 static int prune_tags = -1; /* unspecified */
  51 #define PRUNE_TAGS_BY_DEFAULT 0 /* do we prune tags by default? */
  52
  53 static int all, append, dry_run, force, keep, multiple, update_head_ok, verbosity, deepen_relative;
  54 static int progress = -1;
  55 static int enable_auto_gc = 1;
  56 static int tags = TAGS_DEFAULT, unshallow, update_shallow, deepen;
  57 static int max_children = 1;
  58 static enum transport_family family;
  59 static const char *depth;
  60 static const char *deepen_since;
  61 static const char *upload_pack;
  62 static struct string_list deepen_not = STRING_LIST_INIT_NODUP;
  63 static struct strbuf default_rla = STRBUF_INIT;
  64 static struct transport *gtransport;
  65 static struct transport *gsecondary;
  66 static const char *submodule_prefix = "";
  67 static int recurse_submodules = RECURSE_SUBMODULES_DEFAULT;
  68 static int recurse_submodules_default = RECURSE_SUBMODULES_ON_DEMAND;
  69 static int shown_url = 0;
  70 static struct refspec refmap = REFSPEC_INIT_FETCH;
  71 static struct list_objects_filter_options filter_options;
  72 static struct string_list server_options = STRING_LIST_INIT_DUP;
  73 static struct string_list negotiation_tip = STRING_LIST_INIT_NODUP;
  74
  75 static int git_fetch_config(const char *k, const char *v, void *cb)
  76 {
  77         if (!strcmp(k, "fetch.prune")) {
  78                 fetch_prune_config = git_config_bool(k, v);
  79                 return 0;
  80         }
  81
  82         if (!strcmp(k, "fetch.prunetags")) {
  83                 fetch_prune_tags_config = git_config_bool(k, v);
  84                 return 0;
  85         }
  86
  87         if (!strcmp(k, "fetch.showforcedupdates")) {
  88                 fetch_show_forced_updates = git_config_bool(k, v);
  89                 return 0;
  90         }
  91
  92         if (!strcmp(k, "submodule.recurse")) {
  93                 int r = git_config_bool(k, v) ?
  94                         RECURSE_SUBMODULES_ON : RECURSE_SUBMODULES_OFF;
  95                 recurse_submodules = r;
  96         }
  97
  98         if (!strcmp(k, "submodule.fetchjobs")) {
  99                 max_children = parse_submodule_fetchjobs(k, v);
 100                 return 0;
 101         } else if (!strcmp(k, "fetch.recursesubmodules")) {
 102                 recurse_submodules = parse_fetch_recurse_submodules_arg(k, v);
 103                 return 0;
 104         }
 105
 106         return git_default_config(k, v, cb);
 107 }
 108
 109 static int parse_refmap_arg(const struct option *opt, const char *arg, int unset)
 110 {
 111         BUG_ON_OPT_NEG(unset);
 112
 113         /*
 114          * "git fetch --refmap='' origin foo"
 115          * can be used to tell the command not to store anywhere
 116          */
 117         refspec_append(&refmap, arg);
 118
 119         return 0;
 120 }
 121
 122 static struct option builtin_fetch_options[] = {
 123         OPT__VERBOSITY(&verbosity),
 124         OPT_BOOL(0, "all", &all,
 125                  N_("fetch from all remotes")),
 126         OPT_BOOL('a', "append", &append,
 127                  N_("append to .git/FETCH_HEAD instead of overwriting")),
 128         OPT_STRING(0, "upload-pack", &upload_pack, N_("path"),
 129                    N_("path to upload pack on remote end")),
 130         OPT__FORCE(&force, N_("force overwrite of local reference"), 0),
 131         OPT_BOOL('m', "multiple", &multiple,
 132                  N_("fetch from multiple remotes")),
 133         OPT_SET_INT('t', "tags", &tags,
 134                     N_("fetch all tags and associated objects"), TAGS_SET),
 135         OPT_SET_INT('n', NULL, &tags,
 136                     N_("do not fetch all tags (--no-tags)"), TAGS_UNSET),
 137         OPT_INTEGER('j', "jobs", &max_children,
 138                     N_("number of submodules fetched in parallel")),
 139         OPT_BOOL('p', "prune", &prune,
 140                  N_("prune remote-tracking branches no longer on remote")),
 141         OPT_BOOL('P', "prune-tags", &prune_tags,
 142                  N_("prune local tags no longer on remote and clobber changed tags")),
 143         { OPTION_CALLBACK, 0, "recurse-submodules", &recurse_submodules, N_("on-demand"),
 144                     N_("control recursive fetching of submodules"),
 145                     PARSE_OPT_OPTARG, option_fetch_parse_recurse_submodules },
 146         OPT_BOOL(0, "dry-run", &dry_run,
 147                  N_("dry run")),
 148         OPT_BOOL('k', "keep", &keep, N_("keep downloaded pack")),
 149         OPT_BOOL('u', "update-head-ok", &update_head_ok,
 150                     N_("allow updating of HEAD ref")),
 151         OPT_BOOL(0, "progress", &progress, N_("force progress reporting")),
 152         OPT_STRING(0, "depth", &depth, N_("depth"),
 153                    N_("deepen history of shallow clone")),
 154         OPT_STRING(0, "shallow-since", &deepen_since, N_("time"),
 155                    N_("deepen history of shallow repository based on time")),
 156         OPT_STRING_LIST(0, "shallow-exclude", &deepen_not, N_("revision"),
 157                         N_("deepen history of shallow clone, excluding rev")),
 158         OPT_INTEGER(0, "deepen", &deepen_relative,
 159                     N_("deepen history of shallow clone")),
 160         OPT_SET_INT_F(0, "unshallow", &unshallow,
 161                       N_("convert to a complete repository"),
 162                       1, PARSE_OPT_NONEG),
 163         { OPTION_STRING, 0, "submodule-prefix", &submodule_prefix, N_("dir"),
 164                    N_("prepend this to submodule path output"), PARSE_OPT_HIDDEN },
 165         { OPTION_CALLBACK, 0, "recurse-submodules-default",
 166                    &recurse_submodules_default, N_("on-demand"),
 167                    N_("default for recursive fetching of submodules "
 168                       "(lower priority than config files)"),
 169                    PARSE_OPT_HIDDEN, option_fetch_parse_recurse_submodules },
 170         OPT_BOOL(0, "update-shallow", &update_shallow,
 171                  N_("accept refs that update .git/shallow")),
 172         { OPTION_CALLBACK, 0, "refmap", NULL, N_("refmap"),
 173           N_("specify fetch refmap"), PARSE_OPT_NONEG, parse_refmap_arg },
 174         OPT_STRING_LIST('o', "server-option", &server_options, N_("server-specific"), N_("option to transmit")),
 175         OPT_SET_INT('4', "ipv4", &family, N_("use IPv4 addresses only"),
 176                         TRANSPORT_FAMILY_IPV4),
 177         OPT_SET_INT('6', "ipv6", &family, N_("use IPv6 addresses only"),
 178                         TRANSPORT_FAMILY_IPV6),
 179         OPT_STRING_LIST(0, "negotiation-tip", &negotiation_tip, N_("revision"),
 180                         N_("report that we have only objects reachable from this object")),
 181         OPT_PARSE_LIST_OBJECTS_FILTER(&filter_options),
 182         OPT_BOOL(0, "auto-gc", &enable_auto_gc,
 183                  N_("run 'gc --auto' after fetching")),
 184         OPT_BOOL(0, "show-forced-updates", &fetch_show_forced_updates,
 185                  N_("check for forced-updates on all updated branches")),
 186         OPT_END()
 187 };
 188
 189 static void unlock_pack(void)
 190 {
 191         if (gtransport)
 192                 transport_unlock_pack(gtransport);
 193         if (gsecondary)
 194                 transport_unlock_pack(gsecondary);
 195 }
 196
 197 static void unlock_pack_on_signal(int signo)
 198 {
 199         unlock_pack();
 200         sigchain_pop(signo);
 201         raise(signo);
 202 }
 203
 204 static void add_merge_config(struct ref **head,
 205                            const struct ref *remote_refs,
 206                            struct branch *branch,
 207                            struct ref ***tail)
 208 {
 209         int i;
 210
 211         for (i = 0; i < branch->merge_nr; i++) {
 212                 struct ref *rm, **old_tail = *tail;
 213                 struct refspec_item refspec;
 214
 215                 for (rm = *head; rm; rm = rm->next) {
 216                         if (branch_merge_matches(branch, i, rm->name)) {
 217                                 rm->fetch_head_status = FETCH_HEAD_MERGE;
 218                                 break;
 219                         }
 220                 }
 221                 if (rm)
 222                         continue;
 223
 224                 /*
 225                  * Not fetched to a remote-tracking branch?  We need to fetch
 226                  * it anyway to allow this branch's "branch.$name.merge"
 227                  * to be honored by 'git pull', but we do not have to
 228                  * fail if branch.$name.merge is misconfigured to point
 229                  * at a nonexisting branch.  If we were indeed called by
 230                  * 'git pull', it will notice the misconfiguration because
 231                  * there is no entry in the resulting FETCH_HEAD marked
 232                  * for merging.
 233                  */
 234                 memset(&refspec, 0, sizeof(refspec));
 235                 refspec.src = branch->merge[i]->src;
 236                 get_fetch_map(remote_refs, &refspec, tail, 1);
 237                 for (rm = *old_tail; rm; rm = rm->next)
 238                         rm->fetch_head_status = FETCH_HEAD_MERGE;
 239         }
 240 }
 241
 242 static int will_fetch(struct ref **head, const unsigned char *sha1)
 243 {
 244         struct ref *rm = *head;
 245         while (rm) {
 246                 if (hasheq(rm->old_oid.hash, sha1))
 247                         return 1;
 248                 rm = rm->next;
 249         }
 250         return 0;
 251 }
 252
 253 struct refname_hash_entry {
 254         struct hashmap_entry ent; /* must be the first member */
 255         struct object_id oid;
 256         int ignore;
 257         char refname[FLEX_ARRAY];
 258 };
 259
 260 static int refname_hash_entry_cmp(const void *hashmap_cmp_fn_data,
 261                                   const void *e1_,
 262                                   const void *e2_,
 263                                   const void *keydata)
 264 {
 265         const struct refname_hash_entry *e1 = e1_;
 266         const struct refname_hash_entry *e2 = e2_;
 267
 268         return strcmp(e1->refname, keydata ? keydata : e2->refname);
 269 }
 270
 271 static struct refname_hash_entry *refname_hash_add(struct hashmap *map,
 272                                                    const char *refname,
 273                                                    const struct object_id *oid)
 274 {
 275         struct refname_hash_entry *ent;
 276         size_t len = strlen(refname);
 277
 278         FLEX_ALLOC_MEM(ent, refname, refname, len);
 279         hashmap_entry_init(ent, strhash(refname));
 280         oidcpy(&ent->oid, oid);
 281         hashmap_add(map, ent);
 282         return ent;
 283 }
 284
 285 static int add_one_refname(const char *refname,
 286                            const struct object_id *oid,
 287                            int flag, void *cbdata)
 288 {
 289         struct hashmap *refname_map = cbdata;
 290
 291         (void) refname_hash_add(refname_map, refname, oid);
 292         return 0;
 293 }
 294
 295 static void refname_hash_init(struct hashmap *map)
 296 {
 297         hashmap_init(map, refname_hash_entry_cmp, NULL, 0);
 298 }
 299
 300 static int refname_hash_exists(struct hashmap *map, const char *refname)
 301 {
 302         return !!hashmap_get_from_hash(map, strhash(refname), refname);
 303 }
 304
 305 static void clear_item(struct refname_hash_entry *item)
 306 {
 307         item->ignore = 1;
 308 }
 309
 310 static void find_non_local_tags(const struct ref *refs,
 311                                 struct ref **head,
 312                                 struct ref ***tail)
 313 {
 314         struct hashmap existing_refs;
 315         struct hashmap remote_refs;
 316         struct string_list remote_refs_list = STRING_LIST_INIT_NODUP;
 317         struct string_list_item *remote_ref_item;
 318         const struct ref *ref;
 319         struct refname_hash_entry *item = NULL;
 320
 321         refname_hash_init(&existing_refs);
 322         refname_hash_init(&remote_refs);
 323
 324         for_each_ref(add_one_refname, &existing_refs);
 325         for (ref = refs; ref; ref = ref->next) {
 326                 if (!starts_with(ref->name, "refs/tags/"))
 327                         continue;
 328
 329                 /*
 330                  * The peeled ref always follows the matching base
 331                  * ref, so if we see a peeled ref that we don't want
 332                  * to fetch then we can mark the ref entry in the list
 333                  * as one to ignore by setting util to NULL.
 334                  */
 335                 if (ends_with(ref->name, "^{}")) {
 336                         if (item &&
 337                             !has_object_file_with_flags(&ref->old_oid,
 338                                                         OBJECT_INFO_QUICK) &&
 339                             !will_fetch(head, ref->old_oid.hash) &&
 340                             !has_object_file_with_flags(&item->oid, OBJECT_INFO_QUICK) &&
 341                             !will_fetch(head, item->oid.hash))
 342                                 clear_item(item);
 343                         item = NULL;
 344                         continue;
 345                 }
 346
 347                 /*
 348                  * If item is non-NULL here, then we previously saw a
 349                  * ref not followed by a peeled reference, so we need
 350                  * to check if it is a lightweight tag that we want to
 351                  * fetch.
 352                  */
 353                 if (item &&
 354                     !has_object_file_with_flags(&item->oid, OBJECT_INFO_QUICK) &&
 355                     !will_fetch(head, item->oid.hash))
 356                         clear_item(item);
 357
 358                 item = NULL;
 359
 360                 /* skip duplicates and refs that we already have */
 361                 if (refname_hash_exists(&remote_refs, ref->name) ||
 362                     refname_hash_exists(&existing_refs, ref->name))
 363                         continue;
 364
 365                 item = refname_hash_add(&remote_refs, ref->name, &ref->old_oid);
 366                 string_list_insert(&remote_refs_list, ref->name);
 367         }
 368         hashmap_free(&existing_refs, 1);
 369
 370         /*
 371          * We may have a final lightweight tag that needs to be
 372          * checked to see if it needs fetching.
 373          */
 374         if (item &&
 375             !has_object_file_with_flags(&item->oid, OBJECT_INFO_QUICK) &&
 376             !will_fetch(head, item->oid.hash))
 377                 clear_item(item);
 378
 379         /*
 380          * For all the tags in the remote_refs_list,
 381          * add them to the list of refs to be fetched
 382          */
 383         for_each_string_list_item(remote_ref_item, &remote_refs_list) {
 384                 const char *refname = remote_ref_item->string;
 385                 struct ref *rm;
 386
 387                 item = hashmap_get_from_hash(&remote_refs, strhash(refname), refname);
 388                 if (!item)
 389                         BUG("unseen remote ref?");
 390
 391                 /* Unless we have already decided to ignore this item... */
 392                 if (item->ignore)
 393                         continue;
 394
 395                 rm = alloc_ref(item->refname);
 396                 rm->peer_ref = alloc_ref(item->refname);
 397                 oidcpy(&rm->old_oid, &item->oid);
 398                 **tail = rm;
 399                 *tail = &rm->next;
 400         }
 401         hashmap_free(&remote_refs, 1);
 402         string_list_clear(&remote_refs_list, 0);
 403 }
 404
 405 static struct ref *get_ref_map(struct remote *remote,
 406                                const struct ref *remote_refs,
 407                                struct refspec *rs,
 408                                int tags, int *autotags)
 409 {
 410         int i;
 411         struct ref *rm;
 412         struct ref *ref_map = NULL;
 413         struct ref **tail = &ref_map;
 414
 415         /* opportunistically-updated references: */
 416         struct ref *orefs = NULL, **oref_tail = &orefs;
 417
 418         struct hashmap existing_refs;
 419
 420         if (rs->nr) {
 421                 struct refspec *fetch_refspec;
 422
 423                 for (i = 0; i < rs->nr; i++) {
 424                         get_fetch_map(remote_refs, &rs->items[i], &tail, 0);
 425                         if (rs->items[i].dst && rs->items[i].dst[0])
 426                                 *autotags = 1;
 427                 }
 428                 /* Merge everything on the command line (but not --tags) */
 429                 for (rm = ref_map; rm; rm = rm->next)
 430                         rm->fetch_head_status = FETCH_HEAD_MERGE;
 431
 432                 /*
 433                  * For any refs that we happen to be fetching via
 434                  * command-line arguments, the destination ref might
 435                  * have been missing or have been different than the
 436                  * remote-tracking ref that would be derived from the
 437                  * configured refspec.  In these cases, we want to
 438                  * take the opportunity to update their configured
 439                  * remote-tracking reference.  However, we do not want
 440                  * to mention these entries in FETCH_HEAD at all, as
 441                  * they would simply be duplicates of existing
 442                  * entries, so we set them FETCH_HEAD_IGNORE below.
 443                  *
 444                  * We compute these entries now, based only on the
 445                  * refspecs specified on the command line.  But we add
 446                  * them to the list following the refspecs resulting
 447                  * from the tags option so that one of the latter,
 448                  * which has FETCH_HEAD_NOT_FOR_MERGE, is not removed
 449                  * by ref_remove_duplicates() in favor of one of these
 450                  * opportunistic entries with FETCH_HEAD_IGNORE.
 451                  */
 452                 if (refmap.nr)
 453                         fetch_refspec = &refmap;
 454                 else
 455                         fetch_refspec = &remote->fetch;
 456
 457                 for (i = 0; i < fetch_refspec->nr; i++)
 458                         get_fetch_map(ref_map, &fetch_refspec->items[i], &oref_tail, 1);
 459         } else if (refmap.nr) {
 460                 die("--refmap option is only meaningful with command-line refspec(s).");
 461         } else {
 462                 /* Use the defaults */
 463                 struct branch *branch = branch_get(NULL);
 464                 int has_merge = branch_has_merge_config(branch);
 465                 if (remote &&
 466                     (remote->fetch.nr ||
 467                      /* Note: has_merge implies non-NULL branch->remote_name */
 468                      (has_merge && !strcmp(branch->remote_name, remote->name)))) {
 469                         for (i = 0; i < remote->fetch.nr; i++) {
 470                                 get_fetch_map(remote_refs, &remote->fetch.items[i], &tail, 0);
 471                                 if (remote->fetch.items[i].dst &&
 472                                     remote->fetch.items[i].dst[0])
 473                                         *autotags = 1;
 474                                 if (!i && !has_merge && ref_map &&
 475                                     !remote->fetch.items[0].pattern)
 476                                         ref_map->fetch_head_status = FETCH_HEAD_MERGE;
 477                         }
 478                         /*
 479                          * if the remote we're fetching from is the same
 480                          * as given in branch.<name>.remote, we add the
 481                          * ref given in branch.<name>.merge, too.
 482                          *
 483                          * Note: has_merge implies non-NULL branch->remote_name
 484                          */
 485                         if (has_merge &&
 486                             !strcmp(branch->remote_name, remote->name))
 487                                 add_merge_config(&ref_map, remote_refs, branch, &tail);
 488                 } else {
 489                         ref_map = get_remote_ref(remote_refs, "HEAD");
 490                         if (!ref_map)
 491                                 die(_("Couldn't find remote ref HEAD"));
 492                         ref_map->fetch_head_status = FETCH_HEAD_MERGE;
 493                         tail = &ref_map->next;
 494                 }
 495         }
 496
 497         if (tags == TAGS_SET)
 498                 /* also fetch all tags */
 499                 get_fetch_map(remote_refs, tag_refspec, &tail, 0);
 500         else if (tags == TAGS_DEFAULT && *autotags)
 501                 find_non_local_tags(remote_refs, &ref_map, &tail);
 502
 503         /* Now append any refs to be updated opportunistically: */
 504         *tail = orefs;
 505         for (rm = orefs; rm; rm = rm->next) {
 506                 rm->fetch_head_status = FETCH_HEAD_IGNORE;
 507                 tail = &rm->next;
 508         }
 509
 510         ref_map = ref_remove_duplicates(ref_map);
 511
 512         refname_hash_init(&existing_refs);
 513         for_each_ref(add_one_refname, &existing_refs);
 514
 515         for (rm = ref_map; rm; rm = rm->next) {
 516                 if (rm->peer_ref) {
 517                         const char *refname = rm->peer_ref->name;
 518                         struct refname_hash_entry *peer_item;
 519
 520                         peer_item = hashmap_get_from_hash(&existing_refs,
 521                                                           strhash(refname),
 522                                                           refname);
 523                         if (peer_item) {
 524                                 struct object_id *old_oid = &peer_item->oid;
 525                                 oidcpy(&rm->peer_ref->old_oid, old_oid);
 526                         }
 527                 }
 528         }
 529         hashmap_free(&existing_refs, 1);
 530
 531         return ref_map;
 532 }
 533
 534 #define STORE_REF_ERROR_OTHER 1
 535 #define STORE_REF_ERROR_DF_CONFLICT 2
 536
 537 static int s_update_ref(const char *action,
 538                         struct ref *ref,
 539                         int check_old)
 540 {
 541         char *msg;
 542         char *rla = getenv("GIT_REFLOG_ACTION");
 543         struct ref_transaction *transaction;
 544         struct strbuf err = STRBUF_INIT;
 545         int ret, df_conflict = 0;
 546
 547         if (dry_run)
 548                 return 0;
 549         if (!rla)
 550                 rla = default_rla.buf;
 551         msg = xstrfmt("%s: %s", rla, action);
 552
 553         transaction = ref_transaction_begin(&err);
 554         if (!transaction ||
 555             ref_transaction_update(transaction, ref->name,
 556                                    &ref->new_oid,
 557                                    check_old ? &ref->old_oid : NULL,
 558                                    0, msg, &err))
 559                 goto fail;
 560
 561         ret = ref_transaction_commit(transaction, &err);
 562         if (ret) {
 563                 df_conflict = (ret == TRANSACTION_NAME_CONFLICT);
 564                 goto fail;
 565         }
 566
 567         ref_transaction_free(transaction);
 568         strbuf_release(&err);
 569         free(msg);
 570         return 0;
 571 fail:
 572         ref_transaction_free(transaction);
 573         error("%s", err.buf);
 574         strbuf_release(&err);
 575         free(msg);
 576         return df_conflict ? STORE_REF_ERROR_DF_CONFLICT
 577                            : STORE_REF_ERROR_OTHER;
 578 }
 579
 580 static int refcol_width = 10;
 581 static int compact_format;
 582
 583 static void adjust_refcol_width(const struct ref *ref)
 584 {
 585         int max, rlen, llen, len;
 586
 587         /* uptodate lines are only shown on high verbosity level */
 588         if (!verbosity && oideq(&ref->peer_ref->old_oid, &ref->old_oid))
 589                 return;
 590
 591         max    = term_columns();
 592         rlen   = utf8_strwidth(prettify_refname(ref->name));
 593
 594         llen   = utf8_strwidth(prettify_refname(ref->peer_ref->name));
 595
 596         /*
 597          * rough estimation to see if the output line is too long and
 598          * should not be counted (we can't do precise calculation
 599          * anyway because we don't know if the error explanation part
 600          * will be printed in update_local_ref)
 601          */
 602         if (compact_format) {
 603                 llen = 0;
 604                 max = max * 2 / 3;
 605         }
 606         len = 21 /* flag and summary */ + rlen + 4 /* -> */ + llen;
 607         if (len >= max)
 608                 return;
 609
 610         /*
 611          * Not precise calculation for compact mode because '*' can
 612          * appear on the left hand side of '->' and shrink the column
 613          * back.
 614          */
 615         if (refcol_width < rlen)
 616                 refcol_width = rlen;
 617 }
 618
 619 static void prepare_format_display(struct ref *ref_map)
 620 {
 621         struct ref *rm;
 622         const char *format = "full";
 623
 624         git_config_get_string_const("fetch.output", &format);
 625         if (!strcasecmp(format, "full"))
 626                 compact_format = 0;
 627         else if (!strcasecmp(format, "compact"))
 628                 compact_format = 1;
 629         else
 630                 die(_("configuration fetch.output contains invalid value %s"),
 631                     format);
 632
 633         for (rm = ref_map; rm; rm = rm->next) {
 634                 if (rm->status == REF_STATUS_REJECT_SHALLOW ||
 635                     !rm->peer_ref ||
 636                     !strcmp(rm->name, "HEAD"))
 637                         continue;
 638
 639                 adjust_refcol_width(rm);
 640         }
 641 }
 642
 643 static void print_remote_to_local(struct strbuf *display,
 644                                   const char *remote, const char *local)
 645 {
 646         strbuf_addf(display, "%-*s -> %s", refcol_width, remote, local);
 647 }
 648
 649 static int find_and_replace(struct strbuf *haystack,
 650                             const char *needle,
 651                             const char *placeholder)
 652 {
 653         const char *p = NULL;
 654         int plen, nlen;
 655
 656         nlen = strlen(needle);
 657         if (ends_with(haystack->buf, needle))
 658                 p = haystack->buf + haystack->len - nlen;
 659         else
 660                 p = strstr(haystack->buf, needle);
 661         if (!p)
 662                 return 0;
 663
 664         if (p > haystack->buf && p[-1] != '/')
 665                 return 0;
 666
 667         plen = strlen(p);
 668         if (plen > nlen && p[nlen] != '/')
 669                 return 0;
 670
 671         strbuf_splice(haystack, p - haystack->buf, nlen,
 672                       placeholder, strlen(placeholder));
 673         return 1;
 674 }
 675
 676 static void print_compact(struct strbuf *display,
 677                           const char *remote, const char *local)
 678 {
 679         struct strbuf r = STRBUF_INIT;
 680         struct strbuf l = STRBUF_INIT;
 681
 682         if (!strcmp(remote, local)) {
 683                 strbuf_addf(display, "%-*s -> *", refcol_width, remote);
 684                 return;
 685         }
 686
 687         strbuf_addstr(&r, remote);
 688         strbuf_addstr(&l, local);
 689
 690         if (!find_and_replace(&r, local, "*"))
 691                 find_and_replace(&l, remote, "*");
 692         print_remote_to_local(display, r.buf, l.buf);
 693
 694         strbuf_release(&r);
 695         strbuf_release(&l);
 696 }
 697
 698 static void format_display(struct strbuf *display, char code,
 699                            const char *summary, const char *error,
 700                            const char *remote, const char *local,
 701                            int summary_width)
 702 {
 703         int width = (summary_width + strlen(summary) - gettext_width(summary));
 704
 705         strbuf_addf(display, "%c %-*s ", code, width, summary);
 706         if (!compact_format)
 707                 print_remote_to_local(display, remote, local);
 708         else
 709                 print_compact(display, remote, local);
 710         if (error)
 711                 strbuf_addf(display, "  (%s)", error);
 712 }
 713
 714 static int update_local_ref(struct ref *ref,
 715                             const char *remote,
 716                             const struct ref *remote_ref,
 717                             struct strbuf *display,
 718                             int summary_width)
 719 {
 720         struct commit *current = NULL, *updated;
 721         enum object_type type;
 722         struct branch *current_branch = branch_get(NULL);
 723         const char *pretty_ref = prettify_refname(ref->name);
 724         int fast_forward = 0;
 725
 726         type = oid_object_info(the_repository, &ref->new_oid, NULL);
 727         if (type < 0)
 728                 die(_("object %s not found"), oid_to_hex(&ref->new_oid));
 729
 730         if (oideq(&ref->old_oid, &ref->new_oid)) {
 731                 if (verbosity > 0)
 732                         format_display(display, '=', _("[up to date]"), NULL,
 733                                        remote, pretty_ref, summary_width);
 734                 return 0;
 735         }
 736
 737         if (current_branch &&
 738             !strcmp(ref->name, current_branch->name) &&
 739             !(update_head_ok || is_bare_repository()) &&
 740             !is_null_oid(&ref->old_oid)) {
 741                 /*
 742                  * If this is the head, and it's not okay to update
 743                  * the head, and the old value of the head isn't empty...
 744                  */
 745                 format_display(display, '!', _("[rejected]"),
 746                                _("can't fetch in current branch"),
 747                                remote, pretty_ref, summary_width);
 748                 return 1;
 749         }
 750
 751         if (!is_null_oid(&ref->old_oid) &&
 752             starts_with(ref->name, "refs/tags/")) {
 753                 if (force || ref->force) {
 754                         int r;
 755                         r = s_update_ref("updating tag", ref, 0);
 756                         format_display(display, r ? '!' : 't', _("[tag update]"),
 757                                        r ? _("unable to update local ref") : NULL,
 758                                        remote, pretty_ref, summary_width);
 759                         return r;
 760                 } else {
 761                         format_display(display, '!', _("[rejected]"), _("would clobber existing tag"),
 762                                        remote, pretty_ref, summary_width);
 763                         return 1;
 764                 }
 765         }
 766
 767         current = lookup_commit_reference_gently(the_repository,
 768                                                  &ref->old_oid, 1);
 769         updated = lookup_commit_reference_gently(the_repository,
 770                                                  &ref->new_oid, 1);
 771         if (!current || !updated) {
 772                 const char *msg;
 773                 const char *what;
 774                 int r;
 775                 /*
 776                  * Nicely describe the new ref we're fetching.
 777                  * Base this on the remote's ref name, as it's
 778                  * more likely to follow a standard layout.
 779                  */
 780                 const char *name = remote_ref ? remote_ref->name : "";
 781                 if (starts_with(name, "refs/tags/")) {
 782                         msg = "storing tag";
 783                         what = _("[new tag]");
 784                 } else if (starts_with(name, "refs/heads/")) {
 785                         msg = "storing head";
 786                         what = _("[new branch]");
 787                 } else {
 788                         msg = "storing ref";
 789                         what = _("[new ref]");
 790                 }
 791
 792                 r = s_update_ref(msg, ref, 0);
 793                 format_display(display, r ? '!' : '*', what,
 794                                r ? _("unable to update local ref") : NULL,
 795                                remote, pretty_ref, summary_width);
 796                 return r;
 797         }
 798
 799         if (fetch_show_forced_updates) {
 800                 uint64_t t_before = getnanotime();
 801                 fast_forward = in_merge_bases(current, updated);
 802                 forced_updates_ms += (getnanotime() - t_before) / 1000000;
 803         } else {
 804                 fast_forward = 1;
 805         }
 806
 807         if (fast_forward) {
 808                 struct strbuf quickref = STRBUF_INIT;
 809                 int r;
 810
 811                 strbuf_add_unique_abbrev(&quickref, &current->object.oid, DEFAULT_ABBREV);
 812                 strbuf_addstr(&quickref, "..");
 813                 strbuf_add_unique_abbrev(&quickref, &ref->new_oid, DEFAULT_ABBREV);
 814                 r = s_update_ref("fast-forward", ref, 1);
 815                 format_display(display, r ? '!' : ' ', quickref.buf,
 816                                r ? _("unable to update local ref") : NULL,
 817                                remote, pretty_ref, summary_width);
 818                 strbuf_release(&quickref);
 819                 return r;
 820         } else if (force || ref->force) {
 821                 struct strbuf quickref = STRBUF_INIT;
 822                 int r;
 823                 strbuf_add_unique_abbrev(&quickref, &current->object.oid, DEFAULT_ABBREV);
 824                 strbuf_addstr(&quickref, "...");
 825                 strbuf_add_unique_abbrev(&quickref, &ref->new_oid, DEFAULT_ABBREV);
 826                 r = s_update_ref("forced-update", ref, 1);
 827                 format_display(display, r ? '!' : '+', quickref.buf,
 828                                r ? _("unable to update local ref") : _("forced update"),
 829                                remote, pretty_ref, summary_width);
 830                 strbuf_release(&quickref);
 831                 return r;
 832         } else {
 833                 format_display(display, '!', _("[rejected]"), _("non-fast-forward"),
 834                                remote, pretty_ref, summary_width);
 835                 return 1;
 836         }
 837 }
 838
 839 static int iterate_ref_map(void *cb_data, struct object_id *oid)
 840 {
 841         struct ref **rm = cb_data;
 842         struct ref *ref = *rm;
 843
 844         while (ref && ref->status == REF_STATUS_REJECT_SHALLOW)
 845                 ref = ref->next;
 846         if (!ref)
 847                 return -1; /* end of the list */
 848         *rm = ref->next;
 849         oidcpy(oid, &ref->old_oid);
 850         return 0;
 851 }
 852
 853 static const char warn_show_forced_updates[] =
 854 N_("Fetch normally indicates which branches had a forced update,\n"
 855    "but that check has been disabled. To re-enable, use '--show-forced-updates'\n"
 856    "flag or run 'git config fetch.showForcedUpdates true'.");
 857 static const char warn_time_show_forced_updates[] =
 858 N_("It took %.2f seconds to check forced updates. You can use\n"
 859    "'--no-show-forced-updates' or run 'git config fetch.showForcedUpdates false'\n"
 860    " to avoid this check.\n");
 861
 862 static int store_updated_refs(const char *raw_url, const char *remote_name,
 863                               int connectivity_checked, struct ref *ref_map)
 864 {
 865         FILE *fp;
 866         struct commit *commit;
 867         int url_len, i, rc = 0;
 868         struct strbuf note = STRBUF_INIT;
 869         const char *what, *kind;
 870         struct ref *rm;
 871         char *url;
 872         const char *filename = dry_run ? "/dev/null" : git_path_fetch_head(the_repository);
 873         int want_status;
 874         int summary_width = transport_summary_width(ref_map);
 875
 876         fp = fopen(filename, "a");
 877         if (!fp)
 878                 return error_errno(_("cannot open %s"), filename);
 879
 880         if (raw_url)
 881                 url = transport_anonymize_url(raw_url);
 882         else
 883                 url = xstrdup("foreign");
 884
 885         if (!connectivity_checked) {
 886                 rm = ref_map;
 887                 if (check_connected(iterate_ref_map, &rm, NULL)) {
 888                         rc = error(_("%s did not send all necessary objects\n"), url);
 889                         goto abort;
 890                 }
 891         }
 892
 893         prepare_format_display(ref_map);
 894
 895         /*
 896          * We do a pass for each fetch_head_status type in their enum order, so
 897          * merged entries are written before not-for-merge. That lets readers
 898          * use FETCH_HEAD as a refname to refer to the ref to be merged.
 899          */
 900         for (want_status = FETCH_HEAD_MERGE;
 901              want_status <= FETCH_HEAD_IGNORE;
 902              want_status++) {
 903                 for (rm = ref_map; rm; rm = rm->next) {
 904                         struct ref *ref = NULL;
 905                         const char *merge_status_marker = "";
 906
 907                         if (rm->status == REF_STATUS_REJECT_SHALLOW) {
 908                                 if (want_status == FETCH_HEAD_MERGE)
 909                                         warning(_("reject %s because shallow roots are not allowed to be updated"),
 910                                                 rm->peer_ref ? rm->peer_ref->name : rm->name);
 911                                 continue;
 912                         }
 913
 914                         commit = lookup_commit_reference_gently(the_repository,
 915                                                                 &rm->old_oid,
 916                                                                 1);
 917                         if (!commit)
 918                                 rm->fetch_head_status = FETCH_HEAD_NOT_FOR_MERGE;
 919
 920                         if (rm->fetch_head_status != want_status)
 921                                 continue;
 922
 923                         if (rm->peer_ref) {
 924                                 ref = alloc_ref(rm->peer_ref->name);
 925                                 oidcpy(&ref->old_oid, &rm->peer_ref->old_oid);
 926                                 oidcpy(&ref->new_oid, &rm->old_oid);
 927                                 ref->force = rm->peer_ref->force;
 928                         }
 929
 930                         if (recurse_submodules != RECURSE_SUBMODULES_OFF)
 931                                 check_for_new_submodule_commits(&rm->old_oid);
 932
 933                         if (!strcmp(rm->name, "HEAD")) {
 934                                 kind = "";
 935                                 what = "";
 936                         }
 937                         else if (starts_with(rm->name, "refs/heads/")) {
 938                                 kind = "branch";
 939                                 what = rm->name + 11;
 940                         }
 941                         else if (starts_with(rm->name, "refs/tags/")) {
 942                                 kind = "tag";
 943                                 what = rm->name + 10;
 944                         }
 945                         else if (starts_with(rm->name, "refs/remotes/")) {
 946                                 kind = "remote-tracking branch";
 947                                 what = rm->name + 13;
 948                         }
 949                         else {
 950                                 kind = "";
 951                                 what = rm->name;
 952                         }
 953
 954                         url_len = strlen(url);
 955                         for (i = url_len - 1; url[i] == '/' && 0 <= i; i--)
 956                                 ;
 957                         url_len = i + 1;
 958                         if (4 < i && !strncmp(".git", url + i - 3, 4))
 959                                 url_len = i - 3;
 960
 961                         strbuf_reset(&note);
 962                         if (*what) {
 963                                 if (*kind)
 964                                         strbuf_addf(&note, "%s ", kind);
 965                                 strbuf_addf(&note, "'%s' of ", what);
 966                         }
 967                         switch (rm->fetch_head_status) {
 968                         case FETCH_HEAD_NOT_FOR_MERGE:
 969                                 merge_status_marker = "not-for-merge";
 970                                 /* fall-through */
 971                         case FETCH_HEAD_MERGE:
 972                                 fprintf(fp, "%s\t%s\t%s",
 973                                         oid_to_hex(&rm->old_oid),
 974                                         merge_status_marker,
 975                                         note.buf);
 976                                 for (i = 0; i < url_len; ++i)
 977                                         if ('\n' == url[i])
 978                                                 fputs("\\n", fp);
 979                                         else
 980                                                 fputc(url[i], fp);
 981                                 fputc('\n', fp);
 982                                 break;
 983                         default:
 984                                 /* do not write anything to FETCH_HEAD */
 985                                 break;
 986                         }
 987
 988                         strbuf_reset(&note);
 989                         if (ref) {
 990                                 rc |= update_local_ref(ref, what, rm, &note,
 991                                                        summary_width);
 992                                 free(ref);
 993                         } else
 994                                 format_display(&note, '*',
 995                                                *kind ? kind : "branch", NULL,
 996                                                *what ? what : "HEAD",
 997                                                "FETCH_HEAD", summary_width);
 998                         if (note.len) {
 999                                 if (verbosity >= 0 && !shown_url) {
1000                                         fprintf(stderr, _("From %.*s\n"),
1001                                                         url_len, url);
1002                                         shown_url = 1;
1003                                 }
1004                                 if (verbosity >= 0)
1005                                         fprintf(stderr, " %s\n", note.buf);
1006                         }
1007                 }
1008         }
1009
1010         if (rc & STORE_REF_ERROR_DF_CONFLICT)
1011                 error(_("some local refs could not be updated; try running\n"
1012                       " 'git remote prune %s' to remove any old, conflicting "
1013                       "branches"), remote_name);
1014
1015         if (advice_fetch_show_forced_updates) {
1016                 if (!fetch_show_forced_updates) {
1017                         warning(_(warn_show_forced_updates));
1018                 } else if (forced_updates_ms > FORCED_UPDATES_DELAY_WARNING_IN_MS) {
1019                         warning(_(warn_time_show_forced_updates),
1020                                 forced_updates_ms / 1000.0);
1021                 }
1022         }
1023
1024  abort:
1025         strbuf_release(&note);
1026         free(url);
1027         fclose(fp);
1028         return rc;
1029 }
1030
1031 /*
1032  * We would want to bypass the object transfer altogether if
1033  * everything we are going to fetch already exists and is connected
1034  * locally.
1035  */
1036 static int check_exist_and_connected(struct ref *ref_map)
1037 {
1038         struct ref *rm = ref_map;
1039         struct check_connected_options opt = CHECK_CONNECTED_INIT;
1040         struct ref *r;
1041
1042         /*
1043          * If we are deepening a shallow clone we already have these
1044          * objects reachable.  Running rev-list here will return with
1045          * a good (0) exit status and we'll bypass the fetch that we
1046          * really need to perform.  Claiming failure now will ensure
1047          * we perform the network exchange to deepen our history.
1048          */
1049         if (deepen)
1050                 return -1;
1051
1052         /*
1053          * check_connected() allows objects to merely be promised, but
1054          * we need all direct targets to exist.
1055          */
1056         for (r = rm; r; r = r->next) {
1057                 if (!has_object_file(&r->old_oid))
1058                         return -1;
1059         }
1060
1061         opt.quiet = 1;
1062         return check_connected(iterate_ref_map, &rm, &opt);
1063 }
1064
1065 static int fetch_refs(struct transport *transport, struct ref *ref_map)
1066 {
1067         int ret = check_exist_and_connected(ref_map);
1068         if (ret)
1069                 ret = transport_fetch_refs(transport, ref_map);
1070         if (!ret)
1071                 /*
1072                  * Keep the new pack's ".keep" file around to allow the caller
1073                  * time to update refs to reference the new objects.
1074                  */
1075                 return 0;
1076         transport_unlock_pack(transport);
1077         return ret;
1078 }
1079
1080 /* Update local refs based on the ref values fetched from a remote */
1081 static int consume_refs(struct transport *transport, struct ref *ref_map)
1082 {
1083         int connectivity_checked = transport->smart_options
1084                 ? transport->smart_options->connectivity_checked : 0;
1085         int ret = store_updated_refs(transport->url,
1086                                      transport->remote->name,
1087                                      connectivity_checked,
1088                                      ref_map);
1089         transport_unlock_pack(transport);
1090         return ret;
1091 }
1092
1093 static int prune_refs(struct refspec *rs, struct ref *ref_map,
1094                       const char *raw_url)
1095 {
1096         int url_len, i, result = 0;
1097         struct ref *ref, *stale_refs = get_stale_heads(rs, ref_map);
1098         char *url;
1099         int summary_width = transport_summary_width(stale_refs);
1100         const char *dangling_msg = dry_run
1101                 ? _("   (%s will become dangling)")
1102                 : _("   (%s has become dangling)");
1103
1104         if (raw_url)
1105                 url = transport_anonymize_url(raw_url);
1106         else
1107                 url = xstrdup("foreign");
1108
1109         url_len = strlen(url);
1110         for (i = url_len - 1; url[i] == '/' && 0 <= i; i--)
1111                 ;
1112
1113         url_len = i + 1;
1114         if (4 < i && !strncmp(".git", url + i - 3, 4))
1115                 url_len = i - 3;
1116
1117         if (!dry_run) {
1118                 struct string_list refnames = STRING_LIST_INIT_NODUP;
1119
1120                 for (ref = stale_refs; ref; ref = ref->next)
1121                         string_list_append(&refnames, ref->name);
1122
1123                 result = delete_refs("fetch: prune", &refnames, 0);
1124                 string_list_clear(&refnames, 0);
1125         }
1126
1127         if (verbosity >= 0) {
1128                 for (ref = stale_refs; ref; ref = ref->next) {
1129                         struct strbuf sb = STRBUF_INIT;
1130                         if (!shown_url) {
1131                                 fprintf(stderr, _("From %.*s\n"), url_len, url);
1132                                 shown_url = 1;
1133                         }
1134                         format_display(&sb, '-', _("[deleted]"), NULL,
1135                                        _("(none)"), prettify_refname(ref->name),
1136                                        summary_width);
1137                         fprintf(stderr, " %s\n",sb.buf);
1138                         strbuf_release(&sb);
1139                         warn_dangling_symref(stderr, dangling_msg, ref->name);
1140                 }
1141         }
1142
1143         free(url);
1144         free_refs(stale_refs);
1145         return result;
1146 }
1147
1148 static void check_not_current_branch(struct ref *ref_map)
1149 {
1150         struct branch *current_branch = branch_get(NULL);
1151
1152         if (is_bare_repository() || !current_branch)
1153                 return;
1154
1155         for (; ref_map; ref_map = ref_map->next)
1156                 if (ref_map->peer_ref && !strcmp(current_branch->refname,
1157                                         ref_map->peer_ref->name))
1158                         die(_("Refusing to fetch into current branch %s "
1159                             "of non-bare repository"), current_branch->refname);
1160 }
1161
1162 static int truncate_fetch_head(void)
1163 {
1164         const char *filename = git_path_fetch_head(the_repository);
1165         FILE *fp = fopen_for_writing(filename);
1166
1167         if (!fp)
1168                 return error_errno(_("cannot open %s"), filename);
1169         fclose(fp);
1170         return 0;
1171 }
1172
1173 static void set_option(struct transport *transport, const char *name, const char *value)
1174 {
1175         int r = transport_set_option(transport, name, value);
1176         if (r < 0)
1177                 die(_("Option \"%s\" value \"%s\" is not valid for %s"),
1178                     name, value, transport->url);
1179         if (r > 0)
1180                 warning(_("Option \"%s\" is ignored for %s\n"),
1181                         name, transport->url);
1182 }
1183
1184
1185 static int add_oid(const char *refname, const struct object_id *oid, int flags,
1186                    void *cb_data)
1187 {
1188         struct oid_array *oids = cb_data;
1189
1190         oid_array_append(oids, oid);
1191         return 0;
1192 }
1193
1194 static void add_negotiation_tips(struct git_transport_options *smart_options)
1195 {
1196         struct oid_array *oids = xcalloc(1, sizeof(*oids));
1197         int i;
1198
1199         for (i = 0; i < negotiation_tip.nr; i++) {
1200                 const char *s = negotiation_tip.items[i].string;
1201                 int old_nr;
1202                 if (!has_glob_specials(s)) {
1203                         struct object_id oid;
1204                         if (get_oid(s, &oid))
1205                                 die("%s is not a valid object", s);
1206                         oid_array_append(oids, &oid);
1207                         continue;
1208                 }
1209                 old_nr = oids->nr;
1210                 for_each_glob_ref(add_oid, s, oids);
1211                 if (old_nr == oids->nr)
1212                         warning("Ignoring --negotiation-tip=%s because it does not match any refs",
1213                                 s);
1214         }
1215         smart_options->negotiation_tips = oids;
1216 }
1217
1218 static struct transport *prepare_transport(struct remote *remote, int deepen)
1219 {
1220         struct transport *transport;
1221
1222         transport = transport_get(remote, NULL);
1223         transport_set_verbosity(transport, verbosity, progress);
1224         transport->family = family;
1225         if (upload_pack)
1226                 set_option(transport, TRANS_OPT_UPLOADPACK, upload_pack);
1227         if (keep)
1228                 set_option(transport, TRANS_OPT_KEEP, "yes");
1229         if (depth)
1230                 set_option(transport, TRANS_OPT_DEPTH, depth);
1231         if (deepen && deepen_since)
1232                 set_option(transport, TRANS_OPT_DEEPEN_SINCE, deepen_since);
1233         if (deepen && deepen_not.nr)
1234                 set_option(transport, TRANS_OPT_DEEPEN_NOT,
1235                            (const char *)&deepen_not);
1236         if (deepen_relative)
1237                 set_option(transport, TRANS_OPT_DEEPEN_RELATIVE, "yes");
1238         if (update_shallow)
1239                 set_option(transport, TRANS_OPT_UPDATE_SHALLOW, "yes");
1240         if (filter_options.choice) {
1241                 struct strbuf expanded_filter_spec = STRBUF_INIT;
1242                 expand_list_objects_filter_spec(&filter_options,
1243                                                 &expanded_filter_spec);
1244                 set_option(transport, TRANS_OPT_LIST_OBJECTS_FILTER,
1245                            expanded_filter_spec.buf);
1246                 set_option(transport, TRANS_OPT_FROM_PROMISOR, "1");
1247                 strbuf_release(&expanded_filter_spec);
1248         }
1249         if (negotiation_tip.nr) {
1250                 if (transport->smart_options)
1251                         add_negotiation_tips(transport->smart_options);
1252                 else
1253                         warning("Ignoring --negotiation-tip because the protocol does not support it.");
1254         }
1255         return transport;
1256 }
1257
1258 static void backfill_tags(struct transport *transport, struct ref *ref_map)
1259 {
1260         int cannot_reuse;
1261
1262         /*
1263          * Once we have set TRANS_OPT_DEEPEN_SINCE, we can't unset it
1264          * when remote helper is used (setting it to an empty string
1265          * is not unsetting). We could extend the remote helper
1266          * protocol for that, but for now, just force a new connection
1267          * without deepen-since. Similar story for deepen-not.
1268          */
1269         cannot_reuse = transport->cannot_reuse ||
1270                 deepen_since || deepen_not.nr;
1271         if (cannot_reuse) {
1272                 gsecondary = prepare_transport(transport->remote, 0);
1273                 transport = gsecondary;
1274         }
1275
1276         transport_set_option(transport, TRANS_OPT_FOLLOWTAGS, NULL);
1277         transport_set_option(transport, TRANS_OPT_DEPTH, "0");
1278         transport_set_option(transport, TRANS_OPT_DEEPEN_RELATIVE, NULL);
1279         if (!fetch_refs(transport, ref_map))
1280                 consume_refs(transport, ref_map);
1281
1282         if (gsecondary) {
1283                 transport_disconnect(gsecondary);
1284                 gsecondary = NULL;
1285         }
1286 }
1287
1288 static int do_fetch(struct transport *transport,
1289                     struct refspec *rs)
1290 {
1291         struct ref *ref_map;
1292         int autotags = (transport->remote->fetch_tags == 1);
1293         int retcode = 0;
1294         const struct ref *remote_refs;
1295         struct argv_array ref_prefixes = ARGV_ARRAY_INIT;
1296         int must_list_refs = 1;
1297
1298         if (tags == TAGS_DEFAULT) {
1299                 if (transport->remote->fetch_tags == 2)
1300                         tags = TAGS_SET;
1301                 if (transport->remote->fetch_tags == -1)
1302                         tags = TAGS_UNSET;
1303         }
1304
1305         /* if not appending, truncate FETCH_HEAD */
1306         if (!append && !dry_run) {
1307                 retcode = truncate_fetch_head();
1308                 if (retcode)
1309                         goto cleanup;
1310         }
1311
1312         if (rs->nr) {
1313                 int i;
1314
1315                 refspec_ref_prefixes(rs, &ref_prefixes);
1316
1317                 /*
1318                  * We can avoid listing refs if all of them are exact
1319                  * OIDs
1320                  */
1321                 must_list_refs = 0;
1322                 for (i = 0; i < rs->nr; i++) {
1323                         if (!rs->items[i].exact_sha1) {
1324                                 must_list_refs = 1;
1325                                 break;
1326                         }
1327                 }
1328         } else if (transport->remote && transport->remote->fetch.nr)
1329                 refspec_ref_prefixes(&transport->remote->fetch, &ref_prefixes);
1330
1331         if (tags == TAGS_SET || tags == TAGS_DEFAULT) {
1332                 must_list_refs = 1;
1333                 if (ref_prefixes.argc)
1334                         argv_array_push(&ref_prefixes, "refs/tags/");
1335         }
1336
1337         if (must_list_refs)
1338                 remote_refs = transport_get_remote_refs(transport, &ref_prefixes);
1339         else
1340                 remote_refs = NULL;
1341
1342         argv_array_clear(&ref_prefixes);
1343
1344         ref_map = get_ref_map(transport->remote, remote_refs, rs,
1345                               tags, &autotags);
1346         if (!update_head_ok)
1347                 check_not_current_branch(ref_map);
1348
1349         if (tags == TAGS_DEFAULT && autotags)
1350                 transport_set_option(transport, TRANS_OPT_FOLLOWTAGS, "1");
1351         if (prune) {
1352                 /*
1353                  * We only prune based on refspecs specified
1354                  * explicitly (via command line or configuration); we
1355                  * don't care whether --tags was specified.
1356                  */
1357                 if (rs->nr) {
1358                         prune_refs(rs, ref_map, transport->url);
1359                 } else {
1360                         prune_refs(&transport->remote->fetch,
1361                                    ref_map,
1362                                    transport->url);
1363                 }
1364         }
1365         if (fetch_refs(transport, ref_map) || consume_refs(transport, ref_map)) {
1366                 free_refs(ref_map);
1367                 retcode = 1;
1368                 goto cleanup;
1369         }
1370         free_refs(ref_map);
1371
1372         /* if neither --no-tags nor --tags was specified, do automated tag
1373          * following ... */
1374         if (tags == TAGS_DEFAULT && autotags) {
1375                 struct ref **tail = &ref_map;
1376                 ref_map = NULL;
1377                 find_non_local_tags(remote_refs, &ref_map, &tail);
1378                 if (ref_map)
1379                         backfill_tags(transport, ref_map);
1380                 free_refs(ref_map);
1381         }
1382
1383  cleanup:
1384         return retcode;
1385 }
1386
1387 static int get_one_remote_for_fetch(struct remote *remote, void *priv)
1388 {
1389         struct string_list *list = priv;
1390         if (!remote->skip_default_update)
1391                 string_list_append(list, remote->name);
1392         return 0;
1393 }
1394
1395 struct remote_group_data {
1396         const char *name;
1397         struct string_list *list;
1398 };
1399
1400 static int get_remote_group(const char *key, const char *value, void *priv)
1401 {
1402         struct remote_group_data *g = priv;
1403
1404         if (skip_prefix(key, "remotes.", &key) && !strcmp(key, g->name)) {
1405                 /* split list by white space */
1406                 while (*value) {
1407                         size_t wordlen = strcspn(value, " \t\n");
1408
1409                         if (wordlen >= 1)
1410                                 string_list_append_nodup(g->list,
1411                                                    xstrndup(value, wordlen));
1412                         value += wordlen + (value[wordlen] != '\0');
1413                 }
1414         }
1415
1416         return 0;
1417 }
1418
1419 static int add_remote_or_group(const char *name, struct string_list *list)
1420 {
1421         int prev_nr = list->nr;
1422         struct remote_group_data g;
1423         g.name = name; g.list = list;
1424
1425         git_config(get_remote_group, &g);
1426         if (list->nr == prev_nr) {
1427                 struct remote *remote = remote_get(name);
1428                 if (!remote_is_configured(remote, 0))
1429                         return 0;
1430                 string_list_append(list, remote->name);
1431         }
1432         return 1;
1433 }
1434
1435 static void add_options_to_argv(struct argv_array *argv)
1436 {
1437         if (dry_run)
1438                 argv_array_push(argv, "--dry-run");
1439         if (prune != -1)
1440                 argv_array_push(argv, prune ? "--prune" : "--no-prune");
1441         if (prune_tags != -1)
1442                 argv_array_push(argv, prune_tags ? "--prune-tags" : "--no-prune-tags");
1443         if (update_head_ok)
1444                 argv_array_push(argv, "--update-head-ok");
1445         if (force)
1446                 argv_array_push(argv, "--force");
1447         if (keep)
1448                 argv_array_push(argv, "--keep");
1449         if (recurse_submodules == RECURSE_SUBMODULES_ON)
1450                 argv_array_push(argv, "--recurse-submodules");
1451         else if (recurse_submodules == RECURSE_SUBMODULES_ON_DEMAND)
1452                 argv_array_push(argv, "--recurse-submodules=on-demand");
1453         if (tags == TAGS_SET)
1454                 argv_array_push(argv, "--tags");
1455         else if (tags == TAGS_UNSET)
1456                 argv_array_push(argv, "--no-tags");
1457         if (verbosity >= 2)
1458                 argv_array_push(argv, "-v");
1459         if (verbosity >= 1)
1460                 argv_array_push(argv, "-v");
1461         else if (verbosity < 0)
1462                 argv_array_push(argv, "-q");
1463
1464 }
1465
1466 static int fetch_multiple(struct string_list *list)
1467 {
1468         int i, result = 0;
1469         struct argv_array argv = ARGV_ARRAY_INIT;
1470
1471         if (!append && !dry_run) {
1472                 int errcode = truncate_fetch_head();
1473                 if (errcode)
1474                         return errcode;
1475         }
1476
1477         argv_array_pushl(&argv, "fetch", "--append", "--no-auto-gc", NULL);
1478         add_options_to_argv(&argv);
1479
1480         for (i = 0; i < list->nr; i++) {
1481                 const char *name = list->items[i].string;
1482                 argv_array_push(&argv, name);
1483                 if (verbosity >= 0)
1484                         printf(_("Fetching %s\n"), name);
1485                 if (run_command_v_opt(argv.argv, RUN_GIT_CMD)) {
1486                         error(_("Could not fetch %s"), name);
1487                         result = 1;
1488                 }
1489                 argv_array_pop(&argv);
1490         }
1491
1492         argv_array_clear(&argv);
1493         return result;
1494 }
1495
1496 /*
1497  * Fetching from the promisor remote should use the given filter-spec
1498  * or inherit the default filter-spec from the config.
1499  */
1500 static inline void fetch_one_setup_partial(struct remote *remote)
1501 {
1502         /*
1503          * Explicit --no-filter argument overrides everything, regardless
1504          * of any prior partial clones and fetches.
1505          */
1506         if (filter_options.no_filter)
1507                 return;
1508
1509         /*
1510          * If no prior partial clone/fetch and the current fetch DID NOT
1511          * request a partial-fetch, do a normal fetch.
1512          */
1513         if (!repository_format_partial_clone && !filter_options.choice)
1514                 return;
1515
1516         /*
1517          * If this is the FIRST partial-fetch request, we enable partial
1518          * on this repo and remember the given filter-spec as the default
1519          * for subsequent fetches to this remote.
1520          */
1521         if (!repository_format_partial_clone && filter_options.choice) {
1522                 partial_clone_register(remote->name, &filter_options);
1523                 return;
1524         }
1525
1526         /*
1527          * We are currently limited to only ONE promisor remote and only
1528          * allow partial-fetches from the promisor remote.
1529          */
1530         if (strcmp(remote->name, repository_format_partial_clone)) {
1531                 if (filter_options.choice)
1532                         die(_("--filter can only be used with the remote "
1533                               "configured in extensions.partialClone"));
1534                 return;
1535         }
1536
1537         /*
1538          * Do a partial-fetch from the promisor remote using either the
1539          * explicitly given filter-spec or inherit the filter-spec from
1540          * the config.
1541          */
1542         if (!filter_options.choice)
1543                 partial_clone_get_default_filter_spec(&filter_options);
1544         return;
1545 }
1546
1547 static int fetch_one(struct remote *remote, int argc, const char **argv, int prune_tags_ok)
1548 {
1549         struct refspec rs = REFSPEC_INIT_FETCH;
1550         int i;
1551         int exit_code;
1552         int maybe_prune_tags;
1553         int remote_via_config = remote_is_configured(remote, 0);
1554
1555         if (!remote)
1556                 die(_("No remote repository specified.  Please, specify either a URL or a\n"
1557                     "remote name from which new revisions should be fetched."));
1558
1559         gtransport = prepare_transport(remote, 1);
1560
1561         if (prune < 0) {
1562                 /* no command line request */
1563                 if (0 <= remote->prune)
1564                         prune = remote->prune;
1565                 else if (0 <= fetch_prune_config)
1566                         prune = fetch_prune_config;
1567                 else
1568                         prune = PRUNE_BY_DEFAULT;
1569         }
1570
1571         if (prune_tags < 0) {
1572                 /* no command line request */
1573                 if (0 <= remote->prune_tags)
1574                         prune_tags = remote->prune_tags;
1575                 else if (0 <= fetch_prune_tags_config)
1576                         prune_tags = fetch_prune_tags_config;
1577                 else
1578                         prune_tags = PRUNE_TAGS_BY_DEFAULT;
1579         }
1580
1581         maybe_prune_tags = prune_tags_ok && prune_tags;
1582         if (maybe_prune_tags && remote_via_config)
1583                 refspec_append(&remote->fetch, TAG_REFSPEC);
1584
1585         if (maybe_prune_tags && (argc || !remote_via_config))
1586                 refspec_append(&rs, TAG_REFSPEC);
1587
1588         for (i = 0; i < argc; i++) {
1589                 if (!strcmp(argv[i], "tag")) {
1590                         char *tag;
1591                         i++;
1592                         if (i >= argc)
1593                                 die(_("You need to specify a tag name."));
1594
1595                         tag = xstrfmt("refs/tags/%s:refs/tags/%s",
1596                                       argv[i], argv[i]);
1597                         refspec_append(&rs, tag);
1598                         free(tag);
1599                 } else {
1600                         refspec_append(&rs, argv[i]);
1601                 }
1602         }
1603
1604         if (server_options.nr)
1605                 gtransport->server_options = &server_options;
1606
1607         sigchain_push_common(unlock_pack_on_signal);
1608         atexit(unlock_pack);
1609         sigchain_push(SIGPIPE, SIG_IGN);
1610         exit_code = do_fetch(gtransport, &rs);
1611         sigchain_pop(SIGPIPE);
1612         refspec_clear(&rs);
1613         transport_disconnect(gtransport);
1614         gtransport = NULL;
1615         return exit_code;
1616 }
1617
1618 int cmd_fetch(int argc, const char **argv, const char *prefix)
1619 {
1620         int i;
1621         struct string_list list = STRING_LIST_INIT_DUP;
1622         struct remote *remote = NULL;
1623         int result = 0;
1624         int prune_tags_ok = 1;
1625         struct argv_array argv_gc_auto = ARGV_ARRAY_INIT;
1626
1627         packet_trace_identity("fetch");
1628
1629         fetch_if_missing = 0;
1630
1631         /* Record the command line for the reflog */
1632         strbuf_addstr(&default_rla, "fetch");
1633         for (i = 1; i < argc; i++)
1634                 strbuf_addf(&default_rla, " %s", argv[i]);
1635
1636         fetch_config_from_gitmodules(&max_children, &recurse_submodules);
1637         git_config(git_fetch_config, NULL);
1638
1639         argc = parse_options(argc, argv, prefix,
1640                              builtin_fetch_options, builtin_fetch_usage, 0);
1641
1642         if (deepen_relative) {
1643                 if (deepen_relative < 0)
1644                         die(_("Negative depth in --deepen is not supported"));
1645                 if (depth)
1646                         die(_("--deepen and --depth are mutually exclusive"));
1647                 depth = xstrfmt("%d", deepen_relative);
1648         }
1649         if (unshallow) {
1650                 if (depth)
1651                         die(_("--depth and --unshallow cannot be used together"));
1652                 else if (!is_repository_shallow(the_repository))
1653                         die(_("--unshallow on a complete repository does not make sense"));
1654                 else
1655                         depth = xstrfmt("%d", INFINITE_DEPTH);
1656         }
1657
1658         /* no need to be strict, transport_set_option() will validate it again */
1659         if (depth && atoi(depth) < 1)
1660                 die(_("depth %s is not a positive number"), depth);
1661         if (depth || deepen_since || deepen_not.nr)
1662                 deepen = 1;
1663
1664         if (filter_options.choice && !repository_format_partial_clone)
1665                 die("--filter can only be used when extensions.partialClone is set");
1666
1667         if (all) {
1668                 if (argc == 1)
1669                         die(_("fetch --all does not take a repository argument"));
1670                 else if (argc > 1)
1671                         die(_("fetch --all does not make sense with refspecs"));
1672                 (void) for_each_remote(get_one_remote_for_fetch, &list);
1673         } else if (argc == 0) {
1674                 /* No arguments -- use default remote */
1675                 remote = remote_get(NULL);
1676         } else if (multiple) {
1677                 /* All arguments are assumed to be remotes or groups */
1678                 for (i = 0; i < argc; i++)
1679                         if (!add_remote_or_group(argv[i], &list))
1680                                 die(_("No such remote or remote group: %s"), argv[i]);
1681         } else {
1682                 /* Single remote or group */
1683                 (void) add_remote_or_group(argv[0], &list);
1684                 if (list.nr > 1) {
1685                         /* More than one remote */
1686                         if (argc > 1)
1687                                 die(_("Fetching a group and specifying refspecs does not make sense"));
1688                 } else {
1689                         /* Zero or one remotes */
1690                         remote = remote_get(argv[0]);
1691                         prune_tags_ok = (argc == 1);
1692                         argc--;
1693                         argv++;
1694                 }
1695         }
1696
1697         if (remote) {
1698                 if (filter_options.choice || repository_format_partial_clone)
1699                         fetch_one_setup_partial(remote);
1700                 result = fetch_one(remote, argc, argv, prune_tags_ok);
1701         } else {
1702                 if (filter_options.choice)
1703                         die(_("--filter can only be used with the remote "
1704                               "configured in extensions.partialclone"));
1705                 /* TODO should this also die if we have a previous partial-clone? */
1706                 result = fetch_multiple(&list);
1707         }
1708
1709         if (!result && (recurse_submodules != RECURSE_SUBMODULES_OFF)) {
1710                 struct argv_array options = ARGV_ARRAY_INIT;
1711
1712                 add_options_to_argv(&options);
1713                 result = fetch_populated_submodules(the_repository,
1714                                                     &options,
1715                                                     submodule_prefix,
1716                                                     recurse_submodules,
1717                                                     recurse_submodules_default,
1718                                                     verbosity < 0,
1719                                                     max_children);
1720                 argv_array_clear(&options);
1721         }
1722
1723         string_list_clear(&list, 0);
1724
1725         close_object_store(the_repository->objects);
1726
1727         if (enable_auto_gc) {
1728                 argv_array_pushl(&argv_gc_auto, "gc", "--auto", NULL);
1729                 if (verbosity < 0)
1730                         argv_array_push(&argv_gc_auto, "--quiet");
1731                 run_command_v_opt(argv_gc_auto.argv, RUN_GIT_CMD);
1732                 argv_array_clear(&argv_gc_auto);
1733         }
1734
1735         return result;
1736 }