builtin/fetch.c

   1 /*
   2  * "git fetch"
   3  */
   4 #include "cache.h"
   5 #include "refs.h"
   6 #include "commit.h"
   7 #include "builtin.h"
   8 #include "string-list.h"
   9 #include "remote.h"
  10 #include "transport.h"
  11 #include "run-command.h"
  12 #include "parse-options.h"
  13 #include "sigchain.h"
  14 #include "transport.h"
  15 #include "submodule.h"
  16 #include "connected.h"
  17 #include "argv-array.h"
  18
  19 static const char * const builtin_fetch_usage[] = {
  20         N_("git fetch [<options>] [<repository> [<refspec>...]]"),
  21         N_("git fetch [<options>] <group>"),
  22         N_("git fetch --multiple [<options>] [(<repository> | <group>)...]"),
  23         N_("git fetch --all [<options>]"),
  24         NULL
  25 };
  26
  27 enum {
  28         TAGS_UNSET = 0,
  29         TAGS_DEFAULT = 1,
  30         TAGS_SET = 2
  31 };
  32
  33 static int fetch_prune_config = -1; /* unspecified */
  34 static int prune = -1; /* unspecified */
  35 #define PRUNE_BY_DEFAULT 0 /* do we prune by default? */
  36
  37 static int all, append, dry_run, force, keep, multiple, update_head_ok, verbosity;
  38 static int progress = -1, recurse_submodules = RECURSE_SUBMODULES_DEFAULT;
  39 static int tags = TAGS_DEFAULT, unshallow, update_shallow;
  40 static const char *depth;
  41 static const char *upload_pack;
  42 static struct strbuf default_rla = STRBUF_INIT;
  43 static struct transport *gtransport;
  44 static struct transport *gsecondary;
  45 static const char *submodule_prefix = "";
  46 static const char *recurse_submodules_default;
  47 static int shown_url = 0;
  48 static int refmap_alloc, refmap_nr;
  49 static const char **refmap_array;
  50
  51 static int option_parse_recurse_submodules(const struct option *opt,
  52                                    const char *arg, int unset)
  53 {
  54         if (unset) {
  55                 recurse_submodules = RECURSE_SUBMODULES_OFF;
  56         } else {
  57                 if (arg)
  58                         recurse_submodules = parse_fetch_recurse_submodules_arg(opt->long_name, arg);
  59                 else
  60                         recurse_submodules = RECURSE_SUBMODULES_ON;
  61         }
  62         return 0;
  63 }
  64
  65 static int git_fetch_config(const char *k, const char *v, void *cb)
  66 {
  67         if (!strcmp(k, "fetch.prune")) {
  68                 fetch_prune_config = git_config_bool(k, v);
  69                 return 0;
  70         }
  71         return 0;
  72 }
  73
  74 static int parse_refmap_arg(const struct option *opt, const char *arg, int unset)
  75 {
  76         ALLOC_GROW(refmap_array, refmap_nr + 1, refmap_alloc);
  77
  78         /*
  79          * "git fetch --refmap='' origin foo"
  80          * can be used to tell the command not to store anywhere
  81          */
  82         if (*arg)
  83                 refmap_array[refmap_nr++] = arg;
  84         return 0;
  85 }
  86
  87 static struct option builtin_fetch_options[] = {
  88         OPT__VERBOSITY(&verbosity),
  89         OPT_BOOL(0, "all", &all,
  90                  N_("fetch from all remotes")),
  91         OPT_BOOL('a', "append", &append,
  92                  N_("append to .git/FETCH_HEAD instead of overwriting")),
  93         OPT_STRING(0, "upload-pack", &upload_pack, N_("path"),
  94                    N_("path to upload pack on remote end")),
  95         OPT__FORCE(&force, N_("force overwrite of local branch")),
  96         OPT_BOOL('m', "multiple", &multiple,
  97                  N_("fetch from multiple remotes")),
  98         OPT_SET_INT('t', "tags", &tags,
  99                     N_("fetch all tags and associated objects"), TAGS_SET),
 100         OPT_SET_INT('n', NULL, &tags,
 101                     N_("do not fetch all tags (--no-tags)"), TAGS_UNSET),
 102         OPT_BOOL('p', "prune", &prune,
 103                  N_("prune remote-tracking branches no longer on remote")),
 104         { OPTION_CALLBACK, 0, "recurse-submodules", NULL, N_("on-demand"),
 105                     N_("control recursive fetching of submodules"),
 106                     PARSE_OPT_OPTARG, option_parse_recurse_submodules },
 107         OPT_BOOL(0, "dry-run", &dry_run,
 108                  N_("dry run")),
 109         OPT_BOOL('k', "keep", &keep, N_("keep downloaded pack")),
 110         OPT_BOOL('u', "update-head-ok", &update_head_ok,
 111                     N_("allow updating of HEAD ref")),
 112         OPT_BOOL(0, "progress", &progress, N_("force progress reporting")),
 113         OPT_STRING(0, "depth", &depth, N_("depth"),
 114                    N_("deepen history of shallow clone")),
 115         { OPTION_SET_INT, 0, "unshallow", &unshallow, NULL,
 116                    N_("convert to a complete repository"),
 117                    PARSE_OPT_NONEG | PARSE_OPT_NOARG, NULL, 1 },
 118         { OPTION_STRING, 0, "submodule-prefix", &submodule_prefix, N_("dir"),
 119                    N_("prepend this to submodule path output"), PARSE_OPT_HIDDEN },
 120         { OPTION_STRING, 0, "recurse-submodules-default",
 121                    &recurse_submodules_default, NULL,
 122                    N_("default mode for recursion"), PARSE_OPT_HIDDEN },
 123         OPT_BOOL(0, "update-shallow", &update_shallow,
 124                  N_("accept refs that update .git/shallow")),
 125         { OPTION_CALLBACK, 0, "refmap", NULL, N_("refmap"),
 126           N_("specify fetch refmap"), PARSE_OPT_NONEG, parse_refmap_arg },
 127         OPT_END()
 128 };
 129
 130 static void unlock_pack(void)
 131 {
 132         if (gtransport)
 133                 transport_unlock_pack(gtransport);
 134         if (gsecondary)
 135                 transport_unlock_pack(gsecondary);
 136 }
 137
 138 static void unlock_pack_on_signal(int signo)
 139 {
 140         unlock_pack();
 141         sigchain_pop(signo);
 142         raise(signo);
 143 }
 144
 145 static void add_merge_config(struct ref **head,
 146                            const struct ref *remote_refs,
 147                            struct branch *branch,
 148                            struct ref ***tail)
 149 {
 150         int i;
 151
 152         for (i = 0; i < branch->merge_nr; i++) {
 153                 struct ref *rm, **old_tail = *tail;
 154                 struct refspec refspec;
 155
 156                 for (rm = *head; rm; rm = rm->next) {
 157                         if (branch_merge_matches(branch, i, rm->name)) {
 158                                 rm->fetch_head_status = FETCH_HEAD_MERGE;
 159                                 break;
 160                         }
 161                 }
 162                 if (rm)
 163                         continue;
 164
 165                 /*
 166                  * Not fetched to a remote-tracking branch?  We need to fetch
 167                  * it anyway to allow this branch's "branch.$name.merge"
 168                  * to be honored by 'git pull', but we do not have to
 169                  * fail if branch.$name.merge is misconfigured to point
 170                  * at a nonexisting branch.  If we were indeed called by
 171                  * 'git pull', it will notice the misconfiguration because
 172                  * there is no entry in the resulting FETCH_HEAD marked
 173                  * for merging.
 174                  */
 175                 memset(&refspec, 0, sizeof(refspec));
 176                 refspec.src = branch->merge[i]->src;
 177                 get_fetch_map(remote_refs, &refspec, tail, 1);
 178                 for (rm = *old_tail; rm; rm = rm->next)
 179                         rm->fetch_head_status = FETCH_HEAD_MERGE;
 180         }
 181 }
 182
 183 static int add_existing(const char *refname, const unsigned char *sha1,
 184                         int flag, void *cbdata)
 185 {
 186         struct string_list *list = (struct string_list *)cbdata;
 187         struct string_list_item *item = string_list_insert(list, refname);
 188         item->util = xmalloc(20);
 189         hashcpy(item->util, sha1);
 190         return 0;
 191 }
 192
 193 static int will_fetch(struct ref **head, const unsigned char *sha1)
 194 {
 195         struct ref *rm = *head;
 196         while (rm) {
 197                 if (!hashcmp(rm->old_sha1, sha1))
 198                         return 1;
 199                 rm = rm->next;
 200         }
 201         return 0;
 202 }
 203
 204 static void find_non_local_tags(struct transport *transport,
 205                         struct ref **head,
 206                         struct ref ***tail)
 207 {
 208         struct string_list existing_refs = STRING_LIST_INIT_DUP;
 209         struct string_list remote_refs = STRING_LIST_INIT_NODUP;
 210         const struct ref *ref;
 211         struct string_list_item *item = NULL;
 212
 213         for_each_ref(add_existing, &existing_refs);
 214         for (ref = transport_get_remote_refs(transport); ref; ref = ref->next) {
 215                 if (!starts_with(ref->name, "refs/tags/"))
 216                         continue;
 217
 218                 /*
 219                  * The peeled ref always follows the matching base
 220                  * ref, so if we see a peeled ref that we don't want
 221                  * to fetch then we can mark the ref entry in the list
 222                  * as one to ignore by setting util to NULL.
 223                  */
 224                 if (ends_with(ref->name, "^{}")) {
 225                         if (item && !has_sha1_file(ref->old_sha1) &&
 226                             !will_fetch(head, ref->old_sha1) &&
 227                             !has_sha1_file(item->util) &&
 228                             !will_fetch(head, item->util))
 229                                 item->util = NULL;
 230                         item = NULL;
 231                         continue;
 232                 }
 233
 234                 /*
 235                  * If item is non-NULL here, then we previously saw a
 236                  * ref not followed by a peeled reference, so we need
 237                  * to check if it is a lightweight tag that we want to
 238                  * fetch.
 239                  */
 240                 if (item && !has_sha1_file(item->util) &&
 241                     !will_fetch(head, item->util))
 242                         item->util = NULL;
 243
 244                 item = NULL;
 245
 246                 /* skip duplicates and refs that we already have */
 247                 if (string_list_has_string(&remote_refs, ref->name) ||
 248                     string_list_has_string(&existing_refs, ref->name))
 249                         continue;
 250
 251                 item = string_list_insert(&remote_refs, ref->name);
 252                 item->util = (void *)ref->old_sha1;
 253         }
 254         string_list_clear(&existing_refs, 1);
 255
 256         /*
 257          * We may have a final lightweight tag that needs to be
 258          * checked to see if it needs fetching.
 259          */
 260         if (item && !has_sha1_file(item->util) &&
 261             !will_fetch(head, item->util))
 262                 item->util = NULL;
 263
 264         /*
 265          * For all the tags in the remote_refs string list,
 266          * add them to the list of refs to be fetched
 267          */
 268         for_each_string_list_item(item, &remote_refs) {
 269                 /* Unless we have already decided to ignore this item... */
 270                 if (item->util)
 271                 {
 272                         struct ref *rm = alloc_ref(item->string);
 273                         rm->peer_ref = alloc_ref(item->string);
 274                         hashcpy(rm->old_sha1, item->util);
 275                         **tail = rm;
 276                         *tail = &rm->next;
 277                 }
 278         }
 279
 280         string_list_clear(&remote_refs, 0);
 281 }
 282
 283 static struct ref *get_ref_map(struct transport *transport,
 284                                struct refspec *refspecs, int refspec_count,
 285                                int tags, int *autotags)
 286 {
 287         int i;
 288         struct ref *rm;
 289         struct ref *ref_map = NULL;
 290         struct ref **tail = &ref_map;
 291
 292         /* opportunistically-updated references: */
 293         struct ref *orefs = NULL, **oref_tail = &orefs;
 294
 295         const struct ref *remote_refs = transport_get_remote_refs(transport);
 296
 297         if (refspec_count) {
 298                 struct refspec *fetch_refspec;
 299                 int fetch_refspec_nr;
 300
 301                 for (i = 0; i < refspec_count; i++) {
 302                         get_fetch_map(remote_refs, &refspecs[i], &tail, 0);
 303                         if (refspecs[i].dst && refspecs[i].dst[0])
 304                                 *autotags = 1;
 305                 }
 306                 /* Merge everything on the command line (but not --tags) */
 307                 for (rm = ref_map; rm; rm = rm->next)
 308                         rm->fetch_head_status = FETCH_HEAD_MERGE;
 309
 310                 /*
 311                  * For any refs that we happen to be fetching via
 312                  * command-line arguments, the destination ref might
 313                  * have been missing or have been different than the
 314                  * remote-tracking ref that would be derived from the
 315                  * configured refspec.  In these cases, we want to
 316                  * take the opportunity to update their configured
 317                  * remote-tracking reference.  However, we do not want
 318                  * to mention these entries in FETCH_HEAD at all, as
 319                  * they would simply be duplicates of existing
 320                  * entries, so we set them FETCH_HEAD_IGNORE below.
 321                  *
 322                  * We compute these entries now, based only on the
 323                  * refspecs specified on the command line.  But we add
 324                  * them to the list following the refspecs resulting
 325                  * from the tags option so that one of the latter,
 326                  * which has FETCH_HEAD_NOT_FOR_MERGE, is not removed
 327                  * by ref_remove_duplicates() in favor of one of these
 328                  * opportunistic entries with FETCH_HEAD_IGNORE.
 329                  */
 330                 if (refmap_array) {
 331                         fetch_refspec = parse_fetch_refspec(refmap_nr, refmap_array);
 332                         fetch_refspec_nr = refmap_nr;
 333                 } else {
 334                         fetch_refspec = transport->remote->fetch;
 335                         fetch_refspec_nr = transport->remote->fetch_refspec_nr;
 336                 }
 337
 338                 for (i = 0; i < fetch_refspec_nr; i++)
 339                         get_fetch_map(ref_map, &fetch_refspec[i], &oref_tail, 1);
 340
 341                 if (tags == TAGS_SET)
 342                         get_fetch_map(remote_refs, tag_refspec, &tail, 0);
 343         } else if (refmap_array) {
 344                 die("--refmap option is only meaningful with command-line refspec(s).");
 345         } else {
 346                 /* Use the defaults */
 347                 struct remote *remote = transport->remote;
 348                 struct branch *branch = branch_get(NULL);
 349                 int has_merge = branch_has_merge_config(branch);
 350                 if (remote &&
 351                     (remote->fetch_refspec_nr ||
 352                      /* Note: has_merge implies non-NULL branch->remote_name */
 353                      (has_merge && !strcmp(branch->remote_name, remote->name)))) {
 354                         for (i = 0; i < remote->fetch_refspec_nr; i++) {
 355                                 get_fetch_map(remote_refs, &remote->fetch[i], &tail, 0);
 356                                 if (remote->fetch[i].dst &&
 357                                     remote->fetch[i].dst[0])
 358                                         *autotags = 1;
 359                                 if (!i && !has_merge && ref_map &&
 360                                     !remote->fetch[0].pattern)
 361                                         ref_map->fetch_head_status = FETCH_HEAD_MERGE;
 362                         }
 363                         /*
 364                          * if the remote we're fetching from is the same
 365                          * as given in branch.<name>.remote, we add the
 366                          * ref given in branch.<name>.merge, too.
 367                          *
 368                          * Note: has_merge implies non-NULL branch->remote_name
 369                          */
 370                         if (has_merge &&
 371                             !strcmp(branch->remote_name, remote->name))
 372                                 add_merge_config(&ref_map, remote_refs, branch, &tail);
 373                 } else {
 374                         ref_map = get_remote_ref(remote_refs, "HEAD");
 375                         if (!ref_map)
 376                                 die(_("Couldn't find remote ref HEAD"));
 377                         ref_map->fetch_head_status = FETCH_HEAD_MERGE;
 378                         tail = &ref_map->next;
 379                 }
 380         }
 381
 382         if (tags == TAGS_SET)
 383                 /* also fetch all tags */
 384                 get_fetch_map(remote_refs, tag_refspec, &tail, 0);
 385         else if (tags == TAGS_DEFAULT && *autotags)
 386                 find_non_local_tags(transport, &ref_map, &tail);
 387
 388         /* Now append any refs to be updated opportunistically: */
 389         *tail = orefs;
 390         for (rm = orefs; rm; rm = rm->next) {
 391                 rm->fetch_head_status = FETCH_HEAD_IGNORE;
 392                 tail = &rm->next;
 393         }
 394
 395         return ref_remove_duplicates(ref_map);
 396 }
 397
 398 #define STORE_REF_ERROR_OTHER 1
 399 #define STORE_REF_ERROR_DF_CONFLICT 2
 400
 401 static int s_update_ref(const char *action,
 402                         struct ref *ref,
 403                         int check_old)
 404 {
 405         char msg[1024];
 406         char *rla = getenv("GIT_REFLOG_ACTION");
 407         static struct ref_lock *lock;
 408
 409         if (dry_run)
 410                 return 0;
 411         if (!rla)
 412                 rla = default_rla.buf;
 413         snprintf(msg, sizeof(msg), "%s: %s", rla, action);
 414         lock = lock_any_ref_for_update(ref->name,
 415                                        check_old ? ref->old_sha1 : NULL,
 416                                        0, NULL);
 417         if (!lock)
 418                 return errno == ENOTDIR ? STORE_REF_ERROR_DF_CONFLICT :
 419                                           STORE_REF_ERROR_OTHER;
 420         if (write_ref_sha1(lock, ref->new_sha1, msg) < 0)
 421                 return errno == ENOTDIR ? STORE_REF_ERROR_DF_CONFLICT :
 422                                           STORE_REF_ERROR_OTHER;
 423         return 0;
 424 }
 425
 426 #define REFCOL_WIDTH  10
 427
 428 static int update_local_ref(struct ref *ref,
 429                             const char *remote,
 430                             const struct ref *remote_ref,
 431                             struct strbuf *display)
 432 {
 433         struct commit *current = NULL, *updated;
 434         enum object_type type;
 435         struct branch *current_branch = branch_get(NULL);
 436         const char *pretty_ref = prettify_refname(ref->name);
 437
 438         type = sha1_object_info(ref->new_sha1, NULL);
 439         if (type < 0)
 440                 die(_("object %s not found"), sha1_to_hex(ref->new_sha1));
 441
 442         if (!hashcmp(ref->old_sha1, ref->new_sha1)) {
 443                 if (verbosity > 0)
 444                         strbuf_addf(display, "= %-*s %-*s -> %s",
 445                                     TRANSPORT_SUMMARY(_("[up to date]")),
 446                                     REFCOL_WIDTH, remote, pretty_ref);
 447                 return 0;
 448         }
 449
 450         if (current_branch &&
 451             !strcmp(ref->name, current_branch->name) &&
 452             !(update_head_ok || is_bare_repository()) &&
 453             !is_null_sha1(ref->old_sha1)) {
 454                 /*
 455                  * If this is the head, and it's not okay to update
 456                  * the head, and the old value of the head isn't empty...
 457                  */
 458                 strbuf_addf(display,
 459                             _("! %-*s %-*s -> %s  (can't fetch in current branch)"),
 460                             TRANSPORT_SUMMARY(_("[rejected]")),
 461                             REFCOL_WIDTH, remote, pretty_ref);
 462                 return 1;
 463         }
 464
 465         if (!is_null_sha1(ref->old_sha1) &&
 466             starts_with(ref->name, "refs/tags/")) {
 467                 int r;
 468                 r = s_update_ref("updating tag", ref, 0);
 469                 strbuf_addf(display, "%c %-*s %-*s -> %s%s",
 470                             r ? '!' : '-',
 471                             TRANSPORT_SUMMARY(_("[tag update]")),
 472                             REFCOL_WIDTH, remote, pretty_ref,
 473                             r ? _("  (unable to update local ref)") : "");
 474                 return r;
 475         }
 476
 477         current = lookup_commit_reference_gently(ref->old_sha1, 1);
 478         updated = lookup_commit_reference_gently(ref->new_sha1, 1);
 479         if (!current || !updated) {
 480                 const char *msg;
 481                 const char *what;
 482                 int r;
 483                 /*
 484                  * Nicely describe the new ref we're fetching.
 485                  * Base this on the remote's ref name, as it's
 486                  * more likely to follow a standard layout.
 487                  */
 488                 const char *name = remote_ref ? remote_ref->name : "";
 489                 if (starts_with(name, "refs/tags/")) {
 490                         msg = "storing tag";
 491                         what = _("[new tag]");
 492                 } else if (starts_with(name, "refs/heads/")) {
 493                         msg = "storing head";
 494                         what = _("[new branch]");
 495                 } else {
 496                         msg = "storing ref";
 497                         what = _("[new ref]");
 498                 }
 499
 500                 if ((recurse_submodules != RECURSE_SUBMODULES_OFF) &&
 501                     (recurse_submodules != RECURSE_SUBMODULES_ON))
 502                         check_for_new_submodule_commits(ref->new_sha1);
 503                 r = s_update_ref(msg, ref, 0);
 504                 strbuf_addf(display, "%c %-*s %-*s -> %s%s",
 505                             r ? '!' : '*',
 506                             TRANSPORT_SUMMARY(what),
 507                             REFCOL_WIDTH, remote, pretty_ref,
 508                             r ? _("  (unable to update local ref)") : "");
 509                 return r;
 510         }
 511
 512         if (in_merge_bases(current, updated)) {
 513                 char quickref[83];
 514                 int r;
 515                 strcpy(quickref, find_unique_abbrev(current->object.sha1, DEFAULT_ABBREV));
 516                 strcat(quickref, "..");
 517                 strcat(quickref, find_unique_abbrev(ref->new_sha1, DEFAULT_ABBREV));
 518                 if ((recurse_submodules != RECURSE_SUBMODULES_OFF) &&
 519                     (recurse_submodules != RECURSE_SUBMODULES_ON))
 520                         check_for_new_submodule_commits(ref->new_sha1);
 521                 r = s_update_ref("fast-forward", ref, 1);
 522                 strbuf_addf(display, "%c %-*s %-*s -> %s%s",
 523                             r ? '!' : ' ',
 524                             TRANSPORT_SUMMARY_WIDTH, quickref,
 525                             REFCOL_WIDTH, remote, pretty_ref,
 526                             r ? _("  (unable to update local ref)") : "");
 527                 return r;
 528         } else if (force || ref->force) {
 529                 char quickref[84];
 530                 int r;
 531                 strcpy(quickref, find_unique_abbrev(current->object.sha1, DEFAULT_ABBREV));
 532                 strcat(quickref, "...");
 533                 strcat(quickref, find_unique_abbrev(ref->new_sha1, DEFAULT_ABBREV));
 534                 if ((recurse_submodules != RECURSE_SUBMODULES_OFF) &&
 535                     (recurse_submodules != RECURSE_SUBMODULES_ON))
 536                         check_for_new_submodule_commits(ref->new_sha1);
 537                 r = s_update_ref("forced-update", ref, 1);
 538                 strbuf_addf(display, "%c %-*s %-*s -> %s  (%s)",
 539                             r ? '!' : '+',
 540                             TRANSPORT_SUMMARY_WIDTH, quickref,
 541                             REFCOL_WIDTH, remote, pretty_ref,
 542                             r ? _("unable to update local ref") : _("forced update"));
 543                 return r;
 544         } else {
 545                 strbuf_addf(display, "! %-*s %-*s -> %s  %s",
 546                             TRANSPORT_SUMMARY(_("[rejected]")),
 547                             REFCOL_WIDTH, remote, pretty_ref,
 548                             _("(non-fast-forward)"));
 549                 return 1;
 550         }
 551 }
 552
 553 static int iterate_ref_map(void *cb_data, unsigned char sha1[20])
 554 {
 555         struct ref **rm = cb_data;
 556         struct ref *ref = *rm;
 557
 558         while (ref && ref->status == REF_STATUS_REJECT_SHALLOW)
 559                 ref = ref->next;
 560         if (!ref)
 561                 return -1; /* end of the list */
 562         *rm = ref->next;
 563         hashcpy(sha1, ref->old_sha1);
 564         return 0;
 565 }
 566
 567 static int store_updated_refs(const char *raw_url, const char *remote_name,
 568                 struct ref *ref_map)
 569 {
 570         FILE *fp;
 571         struct commit *commit;
 572         int url_len, i, rc = 0;
 573         struct strbuf note = STRBUF_INIT;
 574         const char *what, *kind;
 575         struct ref *rm;
 576         char *url, *filename = dry_run ? "/dev/null" : git_path("FETCH_HEAD");
 577         int want_status;
 578
 579         fp = fopen(filename, "a");
 580         if (!fp)
 581                 return error(_("cannot open %s: %s\n"), filename, strerror(errno));
 582
 583         if (raw_url)
 584                 url = transport_anonymize_url(raw_url);
 585         else
 586                 url = xstrdup("foreign");
 587
 588         rm = ref_map;
 589         if (check_everything_connected(iterate_ref_map, 0, &rm)) {
 590                 rc = error(_("%s did not send all necessary objects\n"), url);
 591                 goto abort;
 592         }
 593
 594         /*
 595          * We do a pass for each fetch_head_status type in their enum order, so
 596          * merged entries are written before not-for-merge. That lets readers
 597          * use FETCH_HEAD as a refname to refer to the ref to be merged.
 598          */
 599         for (want_status = FETCH_HEAD_MERGE;
 600              want_status <= FETCH_HEAD_IGNORE;
 601              want_status++) {
 602                 for (rm = ref_map; rm; rm = rm->next) {
 603                         struct ref *ref = NULL;
 604                         const char *merge_status_marker = "";
 605
 606                         if (rm->status == REF_STATUS_REJECT_SHALLOW) {
 607                                 if (want_status == FETCH_HEAD_MERGE)
 608                                         warning(_("reject %s because shallow roots are not allowed to be updated"),
 609                                                 rm->peer_ref ? rm->peer_ref->name : rm->name);
 610                                 continue;
 611                         }
 612
 613                         commit = lookup_commit_reference_gently(rm->old_sha1, 1);
 614                         if (!commit)
 615                                 rm->fetch_head_status = FETCH_HEAD_NOT_FOR_MERGE;
 616
 617                         if (rm->fetch_head_status != want_status)
 618                                 continue;
 619
 620                         if (rm->peer_ref) {
 621                                 ref = xcalloc(1, sizeof(*ref) + strlen(rm->peer_ref->name) + 1);
 622                                 strcpy(ref->name, rm->peer_ref->name);
 623                                 hashcpy(ref->old_sha1, rm->peer_ref->old_sha1);
 624                                 hashcpy(ref->new_sha1, rm->old_sha1);
 625                                 ref->force = rm->peer_ref->force;
 626                         }
 627
 628
 629                         if (!strcmp(rm->name, "HEAD")) {
 630                                 kind = "";
 631                                 what = "";
 632                         }
 633                         else if (starts_with(rm->name, "refs/heads/")) {
 634                                 kind = "branch";
 635                                 what = rm->name + 11;
 636                         }
 637                         else if (starts_with(rm->name, "refs/tags/")) {
 638                                 kind = "tag";
 639                                 what = rm->name + 10;
 640                         }
 641                         else if (starts_with(rm->name, "refs/remotes/")) {
 642                                 kind = "remote-tracking branch";
 643                                 what = rm->name + 13;
 644                         }
 645                         else {
 646                                 kind = "";
 647                                 what = rm->name;
 648                         }
 649
 650                         url_len = strlen(url);
 651                         for (i = url_len - 1; url[i] == '/' && 0 <= i; i--)
 652                                 ;
 653                         url_len = i + 1;
 654                         if (4 < i && !strncmp(".git", url + i - 3, 4))
 655                                 url_len = i - 3;
 656
 657                         strbuf_reset(&note);
 658                         if (*what) {
 659                                 if (*kind)
 660                                         strbuf_addf(&note, "%s ", kind);
 661                                 strbuf_addf(&note, "'%s' of ", what);
 662                         }
 663                         switch (rm->fetch_head_status) {
 664                         case FETCH_HEAD_NOT_FOR_MERGE:
 665                                 merge_status_marker = "not-for-merge";
 666                                 /* fall-through */
 667                         case FETCH_HEAD_MERGE:
 668                                 fprintf(fp, "%s\t%s\t%s",
 669                                         sha1_to_hex(rm->old_sha1),
 670                                         merge_status_marker,
 671                                         note.buf);
 672                                 for (i = 0; i < url_len; ++i)
 673                                         if ('\n' == url[i])
 674                                                 fputs("\\n", fp);
 675                                         else
 676                                                 fputc(url[i], fp);
 677                                 fputc('\n', fp);
 678                                 break;
 679                         default:
 680                                 /* do not write anything to FETCH_HEAD */
 681                                 break;
 682                         }
 683
 684                         strbuf_reset(&note);
 685                         if (ref) {
 686                                 rc |= update_local_ref(ref, what, rm, &note);
 687                                 free(ref);
 688                         } else
 689                                 strbuf_addf(&note, "* %-*s %-*s -> FETCH_HEAD",
 690                                             TRANSPORT_SUMMARY_WIDTH,
 691                                             *kind ? kind : "branch",
 692                                             REFCOL_WIDTH,
 693                                             *what ? what : "HEAD");
 694                         if (note.len) {
 695                                 if (verbosity >= 0 && !shown_url) {
 696                                         fprintf(stderr, _("From %.*s\n"),
 697                                                         url_len, url);
 698                                         shown_url = 1;
 699                                 }
 700                                 if (verbosity >= 0)
 701                                         fprintf(stderr, " %s\n", note.buf);
 702                         }
 703                 }
 704         }
 705
 706         if (rc & STORE_REF_ERROR_DF_CONFLICT)
 707                 error(_("some local refs could not be updated; try running\n"
 708                       " 'git remote prune %s' to remove any old, conflicting "
 709                       "branches"), remote_name);
 710
 711  abort:
 712         strbuf_release(&note);
 713         free(url);
 714         fclose(fp);
 715         return rc;
 716 }
 717
 718 /*
 719  * We would want to bypass the object transfer altogether if
 720  * everything we are going to fetch already exists and is connected
 721  * locally.
 722  */
 723 static int quickfetch(struct ref *ref_map)
 724 {
 725         struct ref *rm = ref_map;
 726
 727         /*
 728          * If we are deepening a shallow clone we already have these
 729          * objects reachable.  Running rev-list here will return with
 730          * a good (0) exit status and we'll bypass the fetch that we
 731          * really need to perform.  Claiming failure now will ensure
 732          * we perform the network exchange to deepen our history.
 733          */
 734         if (depth)
 735                 return -1;
 736         return check_everything_connected(iterate_ref_map, 1, &rm);
 737 }
 738
 739 static int fetch_refs(struct transport *transport, struct ref *ref_map)
 740 {
 741         int ret = quickfetch(ref_map);
 742         if (ret)
 743                 ret = transport_fetch_refs(transport, ref_map);
 744         if (!ret)
 745                 ret |= store_updated_refs(transport->url,
 746                                 transport->remote->name,
 747                                 ref_map);
 748         transport_unlock_pack(transport);
 749         return ret;
 750 }
 751
 752 static int prune_refs(struct refspec *refs, int ref_count, struct ref *ref_map,
 753                 const char *raw_url)
 754 {
 755         int url_len, i, result = 0;
 756         struct ref *ref, *stale_refs = get_stale_heads(refs, ref_count, ref_map);
 757         char *url;
 758         const char *dangling_msg = dry_run
 759                 ? _("   (%s will become dangling)")
 760                 : _("   (%s has become dangling)");
 761
 762         if (raw_url)
 763                 url = transport_anonymize_url(raw_url);
 764         else
 765                 url = xstrdup("foreign");
 766
 767         url_len = strlen(url);
 768         for (i = url_len - 1; url[i] == '/' && 0 <= i; i--)
 769                 ;
 770
 771         url_len = i + 1;
 772         if (4 < i && !strncmp(".git", url + i - 3, 4))
 773                 url_len = i - 3;
 774
 775         for (ref = stale_refs; ref; ref = ref->next) {
 776                 if (!dry_run)
 777                         result |= delete_ref(ref->name, NULL, 0);
 778                 if (verbosity >= 0 && !shown_url) {
 779                         fprintf(stderr, _("From %.*s\n"), url_len, url);
 780                         shown_url = 1;
 781                 }
 782                 if (verbosity >= 0) {
 783                         fprintf(stderr, " x %-*s %-*s -> %s\n",
 784                                 TRANSPORT_SUMMARY(_("[deleted]")),
 785                                 REFCOL_WIDTH, _("(none)"), prettify_refname(ref->name));
 786                         warn_dangling_symref(stderr, dangling_msg, ref->name);
 787                 }
 788         }
 789         free(url);
 790         free_refs(stale_refs);
 791         return result;
 792 }
 793
 794 static void check_not_current_branch(struct ref *ref_map)
 795 {
 796         struct branch *current_branch = branch_get(NULL);
 797
 798         if (is_bare_repository() || !current_branch)
 799                 return;
 800
 801         for (; ref_map; ref_map = ref_map->next)
 802                 if (ref_map->peer_ref && !strcmp(current_branch->refname,
 803                                         ref_map->peer_ref->name))
 804                         die(_("Refusing to fetch into current branch %s "
 805                             "of non-bare repository"), current_branch->refname);
 806 }
 807
 808 static int truncate_fetch_head(void)
 809 {
 810         char *filename = git_path("FETCH_HEAD");
 811         FILE *fp = fopen(filename, "w");
 812
 813         if (!fp)
 814                 return error(_("cannot open %s: %s\n"), filename, strerror(errno));
 815         fclose(fp);
 816         return 0;
 817 }
 818
 819 static void set_option(struct transport *transport, const char *name, const char *value)
 820 {
 821         int r = transport_set_option(transport, name, value);
 822         if (r < 0)
 823                 die(_("Option \"%s\" value \"%s\" is not valid for %s"),
 824                     name, value, transport->url);
 825         if (r > 0)
 826                 warning(_("Option \"%s\" is ignored for %s\n"),
 827                         name, transport->url);
 828 }
 829
 830 static struct transport *prepare_transport(struct remote *remote)
 831 {
 832         struct transport *transport;
 833         transport = transport_get(remote, NULL);
 834         transport_set_verbosity(transport, verbosity, progress);
 835         if (upload_pack)
 836                 set_option(transport, TRANS_OPT_UPLOADPACK, upload_pack);
 837         if (keep)
 838                 set_option(transport, TRANS_OPT_KEEP, "yes");
 839         if (depth)
 840                 set_option(transport, TRANS_OPT_DEPTH, depth);
 841         if (update_shallow)
 842                 set_option(transport, TRANS_OPT_UPDATE_SHALLOW, "yes");
 843         return transport;
 844 }
 845
 846 static void backfill_tags(struct transport *transport, struct ref *ref_map)
 847 {
 848         if (transport->cannot_reuse) {
 849                 gsecondary = prepare_transport(transport->remote);
 850                 transport = gsecondary;
 851         }
 852
 853         transport_set_option(transport, TRANS_OPT_FOLLOWTAGS, NULL);
 854         transport_set_option(transport, TRANS_OPT_DEPTH, "0");
 855         fetch_refs(transport, ref_map);
 856
 857         if (gsecondary) {
 858                 transport_disconnect(gsecondary);
 859                 gsecondary = NULL;
 860         }
 861 }
 862
 863 static int do_fetch(struct transport *transport,
 864                     struct refspec *refs, int ref_count)
 865 {
 866         struct string_list existing_refs = STRING_LIST_INIT_DUP;
 867         struct ref *ref_map;
 868         struct ref *rm;
 869         int autotags = (transport->remote->fetch_tags == 1);
 870         int retcode = 0;
 871
 872         for_each_ref(add_existing, &existing_refs);
 873
 874         if (tags == TAGS_DEFAULT) {
 875                 if (transport->remote->fetch_tags == 2)
 876                         tags = TAGS_SET;
 877                 if (transport->remote->fetch_tags == -1)
 878                         tags = TAGS_UNSET;
 879         }
 880
 881         if (!transport->get_refs_list || !transport->fetch)
 882                 die(_("Don't know how to fetch from %s"), transport->url);
 883
 884         /* if not appending, truncate FETCH_HEAD */
 885         if (!append && !dry_run) {
 886                 retcode = truncate_fetch_head();
 887                 if (retcode)
 888                         goto cleanup;
 889         }
 890
 891         ref_map = get_ref_map(transport, refs, ref_count, tags, &autotags);
 892         if (!update_head_ok)
 893                 check_not_current_branch(ref_map);
 894
 895         for (rm = ref_map; rm; rm = rm->next) {
 896                 if (rm->peer_ref) {
 897                         struct string_list_item *peer_item =
 898                                 string_list_lookup(&existing_refs,
 899                                                    rm->peer_ref->name);
 900                         if (peer_item)
 901                                 hashcpy(rm->peer_ref->old_sha1,
 902                                         peer_item->util);
 903                 }
 904         }
 905
 906         if (tags == TAGS_DEFAULT && autotags)
 907                 transport_set_option(transport, TRANS_OPT_FOLLOWTAGS, "1");
 908         if (prune) {
 909                 /*
 910                  * We only prune based on refspecs specified
 911                  * explicitly (via command line or configuration); we
 912                  * don't care whether --tags was specified.
 913                  */
 914                 if (ref_count) {
 915                         prune_refs(refs, ref_count, ref_map, transport->url);
 916                 } else {
 917                         prune_refs(transport->remote->fetch,
 918                                    transport->remote->fetch_refspec_nr,
 919                                    ref_map,
 920                                    transport->url);
 921                 }
 922         }
 923         if (fetch_refs(transport, ref_map)) {
 924                 free_refs(ref_map);
 925                 retcode = 1;
 926                 goto cleanup;
 927         }
 928         free_refs(ref_map);
 929
 930         /* if neither --no-tags nor --tags was specified, do automated tag
 931          * following ... */
 932         if (tags == TAGS_DEFAULT && autotags) {
 933                 struct ref **tail = &ref_map;
 934                 ref_map = NULL;
 935                 find_non_local_tags(transport, &ref_map, &tail);
 936                 if (ref_map)
 937                         backfill_tags(transport, ref_map);
 938                 free_refs(ref_map);
 939         }
 940
 941  cleanup:
 942         string_list_clear(&existing_refs, 1);
 943         return retcode;
 944 }
 945
 946 static int get_one_remote_for_fetch(struct remote *remote, void *priv)
 947 {
 948         struct string_list *list = priv;
 949         if (!remote->skip_default_update)
 950                 string_list_append(list, remote->name);
 951         return 0;
 952 }
 953
 954 struct remote_group_data {
 955         const char *name;
 956         struct string_list *list;
 957 };
 958
 959 static int get_remote_group(const char *key, const char *value, void *priv)
 960 {
 961         struct remote_group_data *g = priv;
 962
 963         if (starts_with(key, "remotes.") &&
 964                         !strcmp(key + 8, g->name)) {
 965                 /* split list by white space */
 966                 int space = strcspn(value, " \t\n");
 967                 while (*value) {
 968                         if (space > 1) {
 969                                 string_list_append(g->list,
 970                                                    xstrndup(value, space));
 971                         }
 972                         value += space + (value[space] != '\0');
 973                         space = strcspn(value, " \t\n");
 974                 }
 975         }
 976
 977         return 0;
 978 }
 979
 980 static int add_remote_or_group(const char *name, struct string_list *list)
 981 {
 982         int prev_nr = list->nr;
 983         struct remote_group_data g;
 984         g.name = name; g.list = list;
 985
 986         git_config(get_remote_group, &g);
 987         if (list->nr == prev_nr) {
 988                 struct remote *remote;
 989                 if (!remote_is_configured(name))
 990                         return 0;
 991                 remote = remote_get(name);
 992                 string_list_append(list, remote->name);
 993         }
 994         return 1;
 995 }
 996
 997 static void add_options_to_argv(struct argv_array *argv)
 998 {
 999         if (dry_run)
1000                 argv_array_push(argv, "--dry-run");
1001         if (prune != -1)
1002                 argv_array_push(argv, prune ? "--prune" : "--no-prune");
1003         if (update_head_ok)
1004                 argv_array_push(argv, "--update-head-ok");
1005         if (force)
1006                 argv_array_push(argv, "--force");
1007         if (keep)
1008                 argv_array_push(argv, "--keep");
1009         if (recurse_submodules == RECURSE_SUBMODULES_ON)
1010                 argv_array_push(argv, "--recurse-submodules");
1011         else if (recurse_submodules == RECURSE_SUBMODULES_ON_DEMAND)
1012                 argv_array_push(argv, "--recurse-submodules=on-demand");
1013         if (tags == TAGS_SET)
1014                 argv_array_push(argv, "--tags");
1015         else if (tags == TAGS_UNSET)
1016                 argv_array_push(argv, "--no-tags");
1017         if (verbosity >= 2)
1018                 argv_array_push(argv, "-v");
1019         if (verbosity >= 1)
1020                 argv_array_push(argv, "-v");
1021         else if (verbosity < 0)
1022                 argv_array_push(argv, "-q");
1023
1024 }
1025
1026 static int fetch_multiple(struct string_list *list)
1027 {
1028         int i, result = 0;
1029         struct argv_array argv = ARGV_ARRAY_INIT;
1030
1031         if (!append && !dry_run) {
1032                 int errcode = truncate_fetch_head();
1033                 if (errcode)
1034                         return errcode;
1035         }
1036
1037         argv_array_pushl(&argv, "fetch", "--append", NULL);
1038         add_options_to_argv(&argv);
1039
1040         for (i = 0; i < list->nr; i++) {
1041                 const char *name = list->items[i].string;
1042                 argv_array_push(&argv, name);
1043                 if (verbosity >= 0)
1044                         printf(_("Fetching %s\n"), name);
1045                 if (run_command_v_opt(argv.argv, RUN_GIT_CMD)) {
1046                         error(_("Could not fetch %s"), name);
1047                         result = 1;
1048                 }
1049                 argv_array_pop(&argv);
1050         }
1051
1052         argv_array_clear(&argv);
1053         return result;
1054 }
1055
1056 static int fetch_one(struct remote *remote, int argc, const char **argv)
1057 {
1058         static const char **refs = NULL;
1059         struct refspec *refspec;
1060         int ref_nr = 0;
1061         int exit_code;
1062
1063         if (!remote)
1064                 die(_("No remote repository specified.  Please, specify either a URL or a\n"
1065                     "remote name from which new revisions should be fetched."));
1066
1067         gtransport = prepare_transport(remote);
1068
1069         if (prune < 0) {
1070                 /* no command line request */
1071                 if (0 <= gtransport->remote->prune)
1072                         prune = gtransport->remote->prune;
1073                 else if (0 <= fetch_prune_config)
1074                         prune = fetch_prune_config;
1075                 else
1076                         prune = PRUNE_BY_DEFAULT;
1077         }
1078
1079         if (argc > 0) {
1080                 int j = 0;
1081                 int i;
1082                 refs = xcalloc(argc + 1, sizeof(const char *));
1083                 for (i = 0; i < argc; i++) {
1084                         if (!strcmp(argv[i], "tag")) {
1085                                 i++;
1086                                 if (i >= argc)
1087                                         die(_("You need to specify a tag name."));
1088                                 refs[j++] = xstrfmt("refs/tags/%s:refs/tags/%s",
1089                                                     argv[i], argv[i]);
1090                         } else
1091                                 refs[j++] = argv[i];
1092                 }
1093                 refs[j] = NULL;
1094                 ref_nr = j;
1095         }
1096
1097         sigchain_push_common(unlock_pack_on_signal);
1098         atexit(unlock_pack);
1099         refspec = parse_fetch_refspec(ref_nr, refs);
1100         exit_code = do_fetch(gtransport, refspec, ref_nr);
1101         free_refspec(ref_nr, refspec);
1102         transport_disconnect(gtransport);
1103         gtransport = NULL;
1104         return exit_code;
1105 }
1106
1107 int cmd_fetch(int argc, const char **argv, const char *prefix)
1108 {
1109         int i;
1110         struct string_list list = STRING_LIST_INIT_NODUP;
1111         struct remote *remote;
1112         int result = 0;
1113         static const char *argv_gc_auto[] = {
1114                 "gc", "--auto", NULL,
1115         };
1116
1117         packet_trace_identity("fetch");
1118
1119         /* Record the command line for the reflog */
1120         strbuf_addstr(&default_rla, "fetch");
1121         for (i = 1; i < argc; i++)
1122                 strbuf_addf(&default_rla, " %s", argv[i]);
1123
1124         git_config(git_fetch_config, NULL);
1125
1126         argc = parse_options(argc, argv, prefix,
1127                              builtin_fetch_options, builtin_fetch_usage, 0);
1128
1129         if (unshallow) {
1130                 if (depth)
1131                         die(_("--depth and --unshallow cannot be used together"));
1132                 else if (!is_repository_shallow())
1133                         die(_("--unshallow on a complete repository does not make sense"));
1134                 else {
1135                         static char inf_depth[12];
1136                         sprintf(inf_depth, "%d", INFINITE_DEPTH);
1137                         depth = inf_depth;
1138                 }
1139         }
1140
1141         /* no need to be strict, transport_set_option() will validate it again */
1142         if (depth && atoi(depth) < 1)
1143                 die(_("depth %s is not a positive number"), depth);
1144
1145         if (recurse_submodules != RECURSE_SUBMODULES_OFF) {
1146                 if (recurse_submodules_default) {
1147                         int arg = parse_fetch_recurse_submodules_arg("--recurse-submodules-default", recurse_submodules_default);
1148                         set_config_fetch_recurse_submodules(arg);
1149                 }
1150                 gitmodules_config();
1151                 git_config(submodule_config, NULL);
1152         }
1153
1154         if (all) {
1155                 if (argc == 1)
1156                         die(_("fetch --all does not take a repository argument"));
1157                 else if (argc > 1)
1158                         die(_("fetch --all does not make sense with refspecs"));
1159                 (void) for_each_remote(get_one_remote_for_fetch, &list);
1160                 result = fetch_multiple(&list);
1161         } else if (argc == 0) {
1162                 /* No arguments -- use default remote */
1163                 remote = remote_get(NULL);
1164                 result = fetch_one(remote, argc, argv);
1165         } else if (multiple) {
1166                 /* All arguments are assumed to be remotes or groups */
1167                 for (i = 0; i < argc; i++)
1168                         if (!add_remote_or_group(argv[i], &list))
1169                                 die(_("No such remote or remote group: %s"), argv[i]);
1170                 result = fetch_multiple(&list);
1171         } else {
1172                 /* Single remote or group */
1173                 (void) add_remote_or_group(argv[0], &list);
1174                 if (list.nr > 1) {
1175                         /* More than one remote */
1176                         if (argc > 1)
1177                                 die(_("Fetching a group and specifying refspecs does not make sense"));
1178                         result = fetch_multiple(&list);
1179                 } else {
1180                         /* Zero or one remotes */
1181                         remote = remote_get(argv[0]);
1182                         result = fetch_one(remote, argc-1, argv+1);
1183                 }
1184         }
1185
1186         if (!result && (recurse_submodules != RECURSE_SUBMODULES_OFF)) {
1187                 struct argv_array options = ARGV_ARRAY_INIT;
1188
1189                 add_options_to_argv(&options);
1190                 result = fetch_populated_submodules(&options,
1191                                                     submodule_prefix,
1192                                                     recurse_submodules,
1193                                                     verbosity < 0);
1194                 argv_array_clear(&options);
1195         }
1196
1197         /* All names were strdup()ed or strndup()ed */
1198         list.strdup_strings = 1;
1199         string_list_clear(&list, 0);
1200
1201         run_command_v_opt(argv_gc_auto, RUN_GIT_CMD);
1202
1203         return result;
1204 }