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
  18 static const char * const builtin_fetch_usage[] = {
  19         "git fetch [<options>] [<repository> [<refspec>...]]",
  20         "git fetch [<options>] <group>",
  21         "git fetch --multiple [<options>] [(<repository> | <group>)...]",
  22         "git fetch --all [<options>]",
  23         NULL
  24 };
  25
  26 enum {
  27         TAGS_UNSET = 0,
  28         TAGS_DEFAULT = 1,
  29         TAGS_SET = 2
  30 };
  31
  32 static int all, append, dry_run, force, keep, multiple, prune, update_head_ok, verbosity;
  33 static int progress, recurse_submodules = RECURSE_SUBMODULES_DEFAULT;
  34 static int tags = TAGS_DEFAULT;
  35 static const char *depth;
  36 static const char *upload_pack;
  37 static struct strbuf default_rla = STRBUF_INIT;
  38 static struct transport *transport;
  39 static const char *submodule_prefix = "";
  40 static const char *recurse_submodules_default;
  41
  42 static int option_parse_recurse_submodules(const struct option *opt,
  43                                    const char *arg, int unset)
  44 {
  45         if (unset) {
  46                 recurse_submodules = RECURSE_SUBMODULES_OFF;
  47         } else {
  48                 if (arg)
  49                         recurse_submodules = parse_fetch_recurse_submodules_arg(opt->long_name, arg);
  50                 else
  51                         recurse_submodules = RECURSE_SUBMODULES_ON;
  52         }
  53         return 0;
  54 }
  55
  56 static struct option builtin_fetch_options[] = {
  57         OPT__VERBOSITY(&verbosity),
  58         OPT_BOOLEAN(0, "all", &all,
  59                     "fetch from all remotes"),
  60         OPT_BOOLEAN('a', "append", &append,
  61                     "append to .git/FETCH_HEAD instead of overwriting"),
  62         OPT_STRING(0, "upload-pack", &upload_pack, "path",
  63                    "path to upload pack on remote end"),
  64         OPT__FORCE(&force, "force overwrite of local branch"),
  65         OPT_BOOLEAN('m', "multiple", &multiple,
  66                     "fetch from multiple remotes"),
  67         OPT_SET_INT('t', "tags", &tags,
  68                     "fetch all tags and associated objects", TAGS_SET),
  69         OPT_SET_INT('n', NULL, &tags,
  70                     "do not fetch all tags (--no-tags)", TAGS_UNSET),
  71         OPT_BOOLEAN('p', "prune", &prune,
  72                     "prune remote-tracking branches no longer on remote"),
  73         { OPTION_CALLBACK, 0, "recurse-submodules", NULL, "on-demand",
  74                     "control recursive fetching of submodules",
  75                     PARSE_OPT_OPTARG, option_parse_recurse_submodules },
  76         OPT_BOOLEAN(0, "dry-run", &dry_run,
  77                     "dry run"),
  78         OPT_BOOLEAN('k', "keep", &keep, "keep downloaded pack"),
  79         OPT_BOOLEAN('u', "update-head-ok", &update_head_ok,
  80                     "allow updating of HEAD ref"),
  81         OPT_BOOLEAN(0, "progress", &progress, "force progress reporting"),
  82         OPT_STRING(0, "depth", &depth, "depth",
  83                    "deepen history of shallow clone"),
  84         { OPTION_STRING, 0, "submodule-prefix", &submodule_prefix, "dir",
  85                    "prepend this to submodule path output", PARSE_OPT_HIDDEN },
  86         { OPTION_STRING, 0, "recurse-submodules-default",
  87                    &recurse_submodules_default, NULL,
  88                    "default mode for recursion", PARSE_OPT_HIDDEN },
  89         OPT_END()
  90 };
  91
  92 static void unlock_pack(void)
  93 {
  94         if (transport)
  95                 transport_unlock_pack(transport);
  96 }
  97
  98 static void unlock_pack_on_signal(int signo)
  99 {
 100         unlock_pack();
 101         sigchain_pop(signo);
 102         raise(signo);
 103 }
 104
 105 static void add_merge_config(struct ref **head,
 106                            const struct ref *remote_refs,
 107                            struct branch *branch,
 108                            struct ref ***tail)
 109 {
 110         int i;
 111
 112         for (i = 0; i < branch->merge_nr; i++) {
 113                 struct ref *rm, **old_tail = *tail;
 114                 struct refspec refspec;
 115
 116                 for (rm = *head; rm; rm = rm->next) {
 117                         if (branch_merge_matches(branch, i, rm->name)) {
 118                                 rm->merge = 1;
 119                                 break;
 120                         }
 121                 }
 122                 if (rm)
 123                         continue;
 124
 125                 /*
 126                  * Not fetched to a remote-tracking branch?  We need to fetch
 127                  * it anyway to allow this branch's "branch.$name.merge"
 128                  * to be honored by 'git pull', but we do not have to
 129                  * fail if branch.$name.merge is misconfigured to point
 130                  * at a nonexisting branch.  If we were indeed called by
 131                  * 'git pull', it will notice the misconfiguration because
 132                  * there is no entry in the resulting FETCH_HEAD marked
 133                  * for merging.
 134                  */
 135                 memset(&refspec, 0, sizeof(refspec));
 136                 refspec.src = branch->merge[i]->src;
 137                 get_fetch_map(remote_refs, &refspec, tail, 1);
 138                 for (rm = *old_tail; rm; rm = rm->next)
 139                         rm->merge = 1;
 140         }
 141 }
 142
 143 static void find_non_local_tags(struct transport *transport,
 144                         struct ref **head,
 145                         struct ref ***tail);
 146
 147 static struct ref *get_ref_map(struct transport *transport,
 148                                struct refspec *refs, int ref_count, int tags,
 149                                int *autotags)
 150 {
 151         int i;
 152         struct ref *rm;
 153         struct ref *ref_map = NULL;
 154         struct ref **tail = &ref_map;
 155
 156         const struct ref *remote_refs = transport_get_remote_refs(transport);
 157
 158         if (ref_count || tags == TAGS_SET) {
 159                 for (i = 0; i < ref_count; i++) {
 160                         get_fetch_map(remote_refs, &refs[i], &tail, 0);
 161                         if (refs[i].dst && refs[i].dst[0])
 162                                 *autotags = 1;
 163                 }
 164                 /* Merge everything on the command line, but not --tags */
 165                 for (rm = ref_map; rm; rm = rm->next)
 166                         rm->merge = 1;
 167                 if (tags == TAGS_SET)
 168                         get_fetch_map(remote_refs, tag_refspec, &tail, 0);
 169         } else {
 170                 /* Use the defaults */
 171                 struct remote *remote = transport->remote;
 172                 struct branch *branch = branch_get(NULL);
 173                 int has_merge = branch_has_merge_config(branch);
 174                 if (remote &&
 175                     (remote->fetch_refspec_nr ||
 176                      /* Note: has_merge implies non-NULL branch->remote_name */
 177                      (has_merge && !strcmp(branch->remote_name, remote->name)))) {
 178                         for (i = 0; i < remote->fetch_refspec_nr; i++) {
 179                                 get_fetch_map(remote_refs, &remote->fetch[i], &tail, 0);
 180                                 if (remote->fetch[i].dst &&
 181                                     remote->fetch[i].dst[0])
 182                                         *autotags = 1;
 183                                 if (!i && !has_merge && ref_map &&
 184                                     !remote->fetch[0].pattern)
 185                                         ref_map->merge = 1;
 186                         }
 187                         /*
 188                          * if the remote we're fetching from is the same
 189                          * as given in branch.<name>.remote, we add the
 190                          * ref given in branch.<name>.merge, too.
 191                          *
 192                          * Note: has_merge implies non-NULL branch->remote_name
 193                          */
 194                         if (has_merge &&
 195                             !strcmp(branch->remote_name, remote->name))
 196                                 add_merge_config(&ref_map, remote_refs, branch, &tail);
 197                 } else {
 198                         ref_map = get_remote_ref(remote_refs, "HEAD");
 199                         if (!ref_map)
 200                                 die(_("Couldn't find remote ref HEAD"));
 201                         ref_map->merge = 1;
 202                         tail = &ref_map->next;
 203                 }
 204         }
 205         if (tags == TAGS_DEFAULT && *autotags)
 206                 find_non_local_tags(transport, &ref_map, &tail);
 207         ref_remove_duplicates(ref_map);
 208
 209         return ref_map;
 210 }
 211
 212 #define STORE_REF_ERROR_OTHER 1
 213 #define STORE_REF_ERROR_DF_CONFLICT 2
 214
 215 static int s_update_ref(const char *action,
 216                         struct ref *ref,
 217                         int check_old)
 218 {
 219         char msg[1024];
 220         char *rla = getenv("GIT_REFLOG_ACTION");
 221         static struct ref_lock *lock;
 222
 223         if (dry_run)
 224                 return 0;
 225         if (!rla)
 226                 rla = default_rla.buf;
 227         snprintf(msg, sizeof(msg), "%s: %s", rla, action);
 228         lock = lock_any_ref_for_update(ref->name,
 229                                        check_old ? ref->old_sha1 : NULL, 0);
 230         if (!lock)
 231                 return errno == ENOTDIR ? STORE_REF_ERROR_DF_CONFLICT :
 232                                           STORE_REF_ERROR_OTHER;
 233         if (write_ref_sha1(lock, ref->new_sha1, msg) < 0)
 234                 return errno == ENOTDIR ? STORE_REF_ERROR_DF_CONFLICT :
 235                                           STORE_REF_ERROR_OTHER;
 236         return 0;
 237 }
 238
 239 #define REFCOL_WIDTH  10
 240
 241 static int update_local_ref(struct ref *ref,
 242                             const char *remote,
 243                             char *display)
 244 {
 245         struct commit *current = NULL, *updated;
 246         enum object_type type;
 247         struct branch *current_branch = branch_get(NULL);
 248         const char *pretty_ref = prettify_refname(ref->name);
 249
 250         *display = 0;
 251         type = sha1_object_info(ref->new_sha1, NULL);
 252         if (type < 0)
 253                 die(_("object %s not found"), sha1_to_hex(ref->new_sha1));
 254
 255         if (!hashcmp(ref->old_sha1, ref->new_sha1)) {
 256                 if (verbosity > 0)
 257                         sprintf(display, "= %-*s %-*s -> %s", TRANSPORT_SUMMARY_WIDTH,
 258                                 _("[up to date]"), REFCOL_WIDTH, remote,
 259                                 pretty_ref);
 260                 return 0;
 261         }
 262
 263         if (current_branch &&
 264             !strcmp(ref->name, current_branch->name) &&
 265             !(update_head_ok || is_bare_repository()) &&
 266             !is_null_sha1(ref->old_sha1)) {
 267                 /*
 268                  * If this is the head, and it's not okay to update
 269                  * the head, and the old value of the head isn't empty...
 270                  */
 271                 sprintf(display, _("! %-*s %-*s -> %s  (can't fetch in current branch)"),
 272                         TRANSPORT_SUMMARY_WIDTH, _("[rejected]"), REFCOL_WIDTH, remote,
 273                         pretty_ref);
 274                 return 1;
 275         }
 276
 277         if (!is_null_sha1(ref->old_sha1) &&
 278             !prefixcmp(ref->name, "refs/tags/")) {
 279                 int r;
 280                 r = s_update_ref("updating tag", ref, 0);
 281                 sprintf(display, "%c %-*s %-*s -> %s%s", r ? '!' : '-',
 282                         TRANSPORT_SUMMARY_WIDTH, _("[tag update]"), REFCOL_WIDTH, remote,
 283                         pretty_ref, r ? _("  (unable to update local ref)") : "");
 284                 return r;
 285         }
 286
 287         current = lookup_commit_reference_gently(ref->old_sha1, 1);
 288         updated = lookup_commit_reference_gently(ref->new_sha1, 1);
 289         if (!current || !updated) {
 290                 const char *msg;
 291                 const char *what;
 292                 int r;
 293                 if (!strncmp(ref->name, "refs/tags/", 10)) {
 294                         msg = "storing tag";
 295                         what = _("[new tag]");
 296                 }
 297                 else {
 298                         msg = "storing head";
 299                         what = _("[new branch]");
 300                         if ((recurse_submodules != RECURSE_SUBMODULES_OFF) &&
 301                             (recurse_submodules != RECURSE_SUBMODULES_ON))
 302                                 check_for_new_submodule_commits(ref->new_sha1);
 303                 }
 304
 305                 r = s_update_ref(msg, ref, 0);
 306                 sprintf(display, "%c %-*s %-*s -> %s%s", r ? '!' : '*',
 307                         TRANSPORT_SUMMARY_WIDTH, what, REFCOL_WIDTH, remote, pretty_ref,
 308                         r ? _("  (unable to update local ref)") : "");
 309                 return r;
 310         }
 311
 312         if (in_merge_bases(current, &updated, 1)) {
 313                 char quickref[83];
 314                 int r;
 315                 strcpy(quickref, find_unique_abbrev(current->object.sha1, DEFAULT_ABBREV));
 316                 strcat(quickref, "..");
 317                 strcat(quickref, find_unique_abbrev(ref->new_sha1, DEFAULT_ABBREV));
 318                 if ((recurse_submodules != RECURSE_SUBMODULES_OFF) &&
 319                     (recurse_submodules != RECURSE_SUBMODULES_ON))
 320                         check_for_new_submodule_commits(ref->new_sha1);
 321                 r = s_update_ref("fast-forward", ref, 1);
 322                 sprintf(display, "%c %-*s %-*s -> %s%s", r ? '!' : ' ',
 323                         TRANSPORT_SUMMARY_WIDTH, quickref, REFCOL_WIDTH, remote,
 324                         pretty_ref, r ? _("  (unable to update local ref)") : "");
 325                 return r;
 326         } else if (force || ref->force) {
 327                 char quickref[84];
 328                 int r;
 329                 strcpy(quickref, find_unique_abbrev(current->object.sha1, DEFAULT_ABBREV));
 330                 strcat(quickref, "...");
 331                 strcat(quickref, find_unique_abbrev(ref->new_sha1, DEFAULT_ABBREV));
 332                 if ((recurse_submodules != RECURSE_SUBMODULES_OFF) &&
 333                     (recurse_submodules != RECURSE_SUBMODULES_ON))
 334                         check_for_new_submodule_commits(ref->new_sha1);
 335                 r = s_update_ref("forced-update", ref, 1);
 336                 sprintf(display, "%c %-*s %-*s -> %s  (%s)", r ? '!' : '+',
 337                         TRANSPORT_SUMMARY_WIDTH, quickref, REFCOL_WIDTH, remote,
 338                         pretty_ref,
 339                         r ? _("unable to update local ref") : _("forced update"));
 340                 return r;
 341         } else {
 342                 sprintf(display, "! %-*s %-*s -> %s  %s",
 343                         TRANSPORT_SUMMARY_WIDTH, _("[rejected]"), REFCOL_WIDTH, remote,
 344                         pretty_ref, _("(non-fast-forward)"));
 345                 return 1;
 346         }
 347 }
 348
 349 static int iterate_ref_map(void *cb_data, unsigned char sha1[20])
 350 {
 351         struct ref **rm = cb_data;
 352         struct ref *ref = *rm;
 353
 354         if (!ref)
 355                 return -1; /* end of the list */
 356         *rm = ref->next;
 357         hashcpy(sha1, ref->old_sha1);
 358         return 0;
 359 }
 360
 361 static int store_updated_refs(const char *raw_url, const char *remote_name,
 362                 struct ref *ref_map)
 363 {
 364         FILE *fp;
 365         struct commit *commit;
 366         int url_len, i, note_len, shown_url = 0, rc = 0;
 367         char note[1024];
 368         const char *what, *kind;
 369         struct ref *rm;
 370         char *url, *filename = dry_run ? "/dev/null" : git_path("FETCH_HEAD");
 371
 372         fp = fopen(filename, "a");
 373         if (!fp)
 374                 return error(_("cannot open %s: %s\n"), filename, strerror(errno));
 375
 376         if (raw_url)
 377                 url = transport_anonymize_url(raw_url);
 378         else
 379                 url = xstrdup("foreign");
 380
 381         rm = ref_map;
 382         if (check_everything_connected(iterate_ref_map, 0, &rm))
 383                 return error(_("%s did not send all necessary objects\n"), url);
 384
 385         for (rm = ref_map; rm; rm = rm->next) {
 386                 struct ref *ref = NULL;
 387
 388                 if (rm->peer_ref) {
 389                         ref = xcalloc(1, sizeof(*ref) + strlen(rm->peer_ref->name) + 1);
 390                         strcpy(ref->name, rm->peer_ref->name);
 391                         hashcpy(ref->old_sha1, rm->peer_ref->old_sha1);
 392                         hashcpy(ref->new_sha1, rm->old_sha1);
 393                         ref->force = rm->peer_ref->force;
 394                 }
 395
 396                 commit = lookup_commit_reference_gently(rm->old_sha1, 1);
 397                 if (!commit)
 398                         rm->merge = 0;
 399
 400                 if (!strcmp(rm->name, "HEAD")) {
 401                         kind = "";
 402                         what = "";
 403                 }
 404                 else if (!prefixcmp(rm->name, "refs/heads/")) {
 405                         kind = "branch";
 406                         what = rm->name + 11;
 407                 }
 408                 else if (!prefixcmp(rm->name, "refs/tags/")) {
 409                         kind = "tag";
 410                         what = rm->name + 10;
 411                 }
 412                 else if (!prefixcmp(rm->name, "refs/remotes/")) {
 413                         kind = "remote-tracking branch";
 414                         what = rm->name + 13;
 415                 }
 416                 else {
 417                         kind = "";
 418                         what = rm->name;
 419                 }
 420
 421                 url_len = strlen(url);
 422                 for (i = url_len - 1; url[i] == '/' && 0 <= i; i--)
 423                         ;
 424                 url_len = i + 1;
 425                 if (4 < i && !strncmp(".git", url + i - 3, 4))
 426                         url_len = i - 3;
 427
 428                 note_len = 0;
 429                 if (*what) {
 430                         if (*kind)
 431                                 note_len += sprintf(note + note_len, "%s ",
 432                                                     kind);
 433                         note_len += sprintf(note + note_len, "'%s' of ", what);
 434                 }
 435                 note[note_len] = '\0';
 436                 fprintf(fp, "%s\t%s\t%s",
 437                         sha1_to_hex(commit ? commit->object.sha1 :
 438                                     rm->old_sha1),
 439                         rm->merge ? "" : "not-for-merge",
 440                         note);
 441                 for (i = 0; i < url_len; ++i)
 442                         if ('\n' == url[i])
 443                                 fputs("\\n", fp);
 444                         else
 445                                 fputc(url[i], fp);
 446                 fputc('\n', fp);
 447
 448                 if (ref) {
 449                         rc |= update_local_ref(ref, what, note);
 450                         free(ref);
 451                 } else
 452                         sprintf(note, "* %-*s %-*s -> FETCH_HEAD",
 453                                 TRANSPORT_SUMMARY_WIDTH, *kind ? kind : "branch",
 454                                  REFCOL_WIDTH, *what ? what : "HEAD");
 455                 if (*note) {
 456                         if (verbosity >= 0 && !shown_url) {
 457                                 fprintf(stderr, _("From %.*s\n"),
 458                                                 url_len, url);
 459                                 shown_url = 1;
 460                         }
 461                         if (verbosity >= 0)
 462                                 fprintf(stderr, " %s\n", note);
 463                 }
 464         }
 465         free(url);
 466         fclose(fp);
 467         if (rc & STORE_REF_ERROR_DF_CONFLICT)
 468                 error(_("some local refs could not be updated; try running\n"
 469                       " 'git remote prune %s' to remove any old, conflicting "
 470                       "branches"), remote_name);
 471         return rc;
 472 }
 473
 474 /*
 475  * We would want to bypass the object transfer altogether if
 476  * everything we are going to fetch already exists and is connected
 477  * locally.
 478  */
 479 static int quickfetch(struct ref *ref_map)
 480 {
 481         struct ref *rm = ref_map;
 482
 483         /*
 484          * If we are deepening a shallow clone we already have these
 485          * objects reachable.  Running rev-list here will return with
 486          * a good (0) exit status and we'll bypass the fetch that we
 487          * really need to perform.  Claiming failure now will ensure
 488          * we perform the network exchange to deepen our history.
 489          */
 490         if (depth)
 491                 return -1;
 492         return check_everything_connected(iterate_ref_map, 1, &rm);
 493 }
 494
 495 static int fetch_refs(struct transport *transport, struct ref *ref_map)
 496 {
 497         int ret = quickfetch(ref_map);
 498         if (ret)
 499                 ret = transport_fetch_refs(transport, ref_map);
 500         if (!ret)
 501                 ret |= store_updated_refs(transport->url,
 502                                 transport->remote->name,
 503                                 ref_map);
 504         transport_unlock_pack(transport);
 505         return ret;
 506 }
 507
 508 static int prune_refs(struct transport *transport, struct ref *ref_map)
 509 {
 510         int result = 0;
 511         struct ref *ref, *stale_refs = get_stale_heads(transport->remote, ref_map);
 512         const char *dangling_msg = dry_run
 513                 ? _("   (%s will become dangling)\n")
 514                 : _("   (%s has become dangling)\n");
 515
 516         for (ref = stale_refs; ref; ref = ref->next) {
 517                 if (!dry_run)
 518                         result |= delete_ref(ref->name, NULL, 0);
 519                 if (verbosity >= 0) {
 520                         fprintf(stderr, " x %-*s %-*s -> %s\n",
 521                                 TRANSPORT_SUMMARY_WIDTH, _("[deleted]"),
 522                                 REFCOL_WIDTH, _("(none)"), prettify_refname(ref->name));
 523                         warn_dangling_symref(stderr, dangling_msg, ref->name);
 524                 }
 525         }
 526         free_refs(stale_refs);
 527         return result;
 528 }
 529
 530 static int add_existing(const char *refname, const unsigned char *sha1,
 531                         int flag, void *cbdata)
 532 {
 533         struct string_list *list = (struct string_list *)cbdata;
 534         struct string_list_item *item = string_list_insert(list, refname);
 535         item->util = (void *)sha1;
 536         return 0;
 537 }
 538
 539 static int will_fetch(struct ref **head, const unsigned char *sha1)
 540 {
 541         struct ref *rm = *head;
 542         while (rm) {
 543                 if (!hashcmp(rm->old_sha1, sha1))
 544                         return 1;
 545                 rm = rm->next;
 546         }
 547         return 0;
 548 }
 549
 550 static void find_non_local_tags(struct transport *transport,
 551                         struct ref **head,
 552                         struct ref ***tail)
 553 {
 554         struct string_list existing_refs = STRING_LIST_INIT_NODUP;
 555         struct string_list remote_refs = STRING_LIST_INIT_NODUP;
 556         const struct ref *ref;
 557         struct string_list_item *item = NULL;
 558
 559         for_each_ref(add_existing, &existing_refs);
 560         for (ref = transport_get_remote_refs(transport); ref; ref = ref->next) {
 561                 if (prefixcmp(ref->name, "refs/tags"))
 562                         continue;
 563
 564                 /*
 565                  * The peeled ref always follows the matching base
 566                  * ref, so if we see a peeled ref that we don't want
 567                  * to fetch then we can mark the ref entry in the list
 568                  * as one to ignore by setting util to NULL.
 569                  */
 570                 if (!suffixcmp(ref->name, "^{}")) {
 571                         if (item && !has_sha1_file(ref->old_sha1) &&
 572                             !will_fetch(head, ref->old_sha1) &&
 573                             !has_sha1_file(item->util) &&
 574                             !will_fetch(head, item->util))
 575                                 item->util = NULL;
 576                         item = NULL;
 577                         continue;
 578                 }
 579
 580                 /*
 581                  * If item is non-NULL here, then we previously saw a
 582                  * ref not followed by a peeled reference, so we need
 583                  * to check if it is a lightweight tag that we want to
 584                  * fetch.
 585                  */
 586                 if (item && !has_sha1_file(item->util) &&
 587                     !will_fetch(head, item->util))
 588                         item->util = NULL;
 589
 590                 item = NULL;
 591
 592                 /* skip duplicates and refs that we already have */
 593                 if (string_list_has_string(&remote_refs, ref->name) ||
 594                     string_list_has_string(&existing_refs, ref->name))
 595                         continue;
 596
 597                 item = string_list_insert(&remote_refs, ref->name);
 598                 item->util = (void *)ref->old_sha1;
 599         }
 600         string_list_clear(&existing_refs, 0);
 601
 602         /*
 603          * We may have a final lightweight tag that needs to be
 604          * checked to see if it needs fetching.
 605          */
 606         if (item && !has_sha1_file(item->util) &&
 607             !will_fetch(head, item->util))
 608                 item->util = NULL;
 609
 610         /*
 611          * For all the tags in the remote_refs string list,
 612          * add them to the list of refs to be fetched
 613          */
 614         for_each_string_list_item(item, &remote_refs) {
 615                 /* Unless we have already decided to ignore this item... */
 616                 if (item->util)
 617                 {
 618                         struct ref *rm = alloc_ref(item->string);
 619                         rm->peer_ref = alloc_ref(item->string);
 620                         hashcpy(rm->old_sha1, item->util);
 621                         **tail = rm;
 622                         *tail = &rm->next;
 623                 }
 624         }
 625
 626         string_list_clear(&remote_refs, 0);
 627 }
 628
 629 static void check_not_current_branch(struct ref *ref_map)
 630 {
 631         struct branch *current_branch = branch_get(NULL);
 632
 633         if (is_bare_repository() || !current_branch)
 634                 return;
 635
 636         for (; ref_map; ref_map = ref_map->next)
 637                 if (ref_map->peer_ref && !strcmp(current_branch->refname,
 638                                         ref_map->peer_ref->name))
 639                         die(_("Refusing to fetch into current branch %s "
 640                             "of non-bare repository"), current_branch->refname);
 641 }
 642
 643 static int truncate_fetch_head(void)
 644 {
 645         char *filename = git_path("FETCH_HEAD");
 646         FILE *fp = fopen(filename, "w");
 647
 648         if (!fp)
 649                 return error(_("cannot open %s: %s\n"), filename, strerror(errno));
 650         fclose(fp);
 651         return 0;
 652 }
 653
 654 static int do_fetch(struct transport *transport,
 655                     struct refspec *refs, int ref_count)
 656 {
 657         struct string_list existing_refs = STRING_LIST_INIT_NODUP;
 658         struct string_list_item *peer_item = NULL;
 659         struct ref *ref_map;
 660         struct ref *rm;
 661         int autotags = (transport->remote->fetch_tags == 1);
 662
 663         for_each_ref(add_existing, &existing_refs);
 664
 665         if (tags == TAGS_DEFAULT) {
 666                 if (transport->remote->fetch_tags == 2)
 667                         tags = TAGS_SET;
 668                 if (transport->remote->fetch_tags == -1)
 669                         tags = TAGS_UNSET;
 670         }
 671
 672         if (!transport->get_refs_list || !transport->fetch)
 673                 die(_("Don't know how to fetch from %s"), transport->url);
 674
 675         /* if not appending, truncate FETCH_HEAD */
 676         if (!append && !dry_run) {
 677                 int errcode = truncate_fetch_head();
 678                 if (errcode)
 679                         return errcode;
 680         }
 681
 682         ref_map = get_ref_map(transport, refs, ref_count, tags, &autotags);
 683         if (!update_head_ok)
 684                 check_not_current_branch(ref_map);
 685
 686         for (rm = ref_map; rm; rm = rm->next) {
 687                 if (rm->peer_ref) {
 688                         peer_item = string_list_lookup(&existing_refs,
 689                                                        rm->peer_ref->name);
 690                         if (peer_item)
 691                                 hashcpy(rm->peer_ref->old_sha1,
 692                                         peer_item->util);
 693                 }
 694         }
 695
 696         if (tags == TAGS_DEFAULT && autotags)
 697                 transport_set_option(transport, TRANS_OPT_FOLLOWTAGS, "1");
 698         if (fetch_refs(transport, ref_map)) {
 699                 free_refs(ref_map);
 700                 return 1;
 701         }
 702         if (prune)
 703                 prune_refs(transport, ref_map);
 704         free_refs(ref_map);
 705
 706         /* if neither --no-tags nor --tags was specified, do automated tag
 707          * following ... */
 708         if (tags == TAGS_DEFAULT && autotags) {
 709                 struct ref **tail = &ref_map;
 710                 ref_map = NULL;
 711                 find_non_local_tags(transport, &ref_map, &tail);
 712                 if (ref_map) {
 713                         transport_set_option(transport, TRANS_OPT_FOLLOWTAGS, NULL);
 714                         transport_set_option(transport, TRANS_OPT_DEPTH, "0");
 715                         fetch_refs(transport, ref_map);
 716                 }
 717                 free_refs(ref_map);
 718         }
 719
 720         return 0;
 721 }
 722
 723 static void set_option(const char *name, const char *value)
 724 {
 725         int r = transport_set_option(transport, name, value);
 726         if (r < 0)
 727                 die(_("Option \"%s\" value \"%s\" is not valid for %s"),
 728                         name, value, transport->url);
 729         if (r > 0)
 730                 warning(_("Option \"%s\" is ignored for %s\n"),
 731                         name, transport->url);
 732 }
 733
 734 static int get_one_remote_for_fetch(struct remote *remote, void *priv)
 735 {
 736         struct string_list *list = priv;
 737         if (!remote->skip_default_update)
 738                 string_list_append(list, remote->name);
 739         return 0;
 740 }
 741
 742 struct remote_group_data {
 743         const char *name;
 744         struct string_list *list;
 745 };
 746
 747 static int get_remote_group(const char *key, const char *value, void *priv)
 748 {
 749         struct remote_group_data *g = priv;
 750
 751         if (!prefixcmp(key, "remotes.") &&
 752                         !strcmp(key + 8, g->name)) {
 753                 /* split list by white space */
 754                 int space = strcspn(value, " \t\n");
 755                 while (*value) {
 756                         if (space > 1) {
 757                                 string_list_append(g->list,
 758                                                    xstrndup(value, space));
 759                         }
 760                         value += space + (value[space] != '\0');
 761                         space = strcspn(value, " \t\n");
 762                 }
 763         }
 764
 765         return 0;
 766 }
 767
 768 static int add_remote_or_group(const char *name, struct string_list *list)
 769 {
 770         int prev_nr = list->nr;
 771         struct remote_group_data g;
 772         g.name = name; g.list = list;
 773
 774         git_config(get_remote_group, &g);
 775         if (list->nr == prev_nr) {
 776                 struct remote *remote;
 777                 if (!remote_is_configured(name))
 778                         return 0;
 779                 remote = remote_get(name);
 780                 string_list_append(list, remote->name);
 781         }
 782         return 1;
 783 }
 784
 785 static void add_options_to_argv(int *argc, const char **argv)
 786 {
 787         if (dry_run)
 788                 argv[(*argc)++] = "--dry-run";
 789         if (prune)
 790                 argv[(*argc)++] = "--prune";
 791         if (update_head_ok)
 792                 argv[(*argc)++] = "--update-head-ok";
 793         if (force)
 794                 argv[(*argc)++] = "--force";
 795         if (keep)
 796                 argv[(*argc)++] = "--keep";
 797         if (recurse_submodules == RECURSE_SUBMODULES_ON)
 798                 argv[(*argc)++] = "--recurse-submodules";
 799         else if (recurse_submodules == RECURSE_SUBMODULES_ON_DEMAND)
 800                 argv[(*argc)++] = "--recurse-submodules=on-demand";
 801         if (verbosity >= 2)
 802                 argv[(*argc)++] = "-v";
 803         if (verbosity >= 1)
 804                 argv[(*argc)++] = "-v";
 805         else if (verbosity < 0)
 806                 argv[(*argc)++] = "-q";
 807
 808 }
 809
 810 static int fetch_multiple(struct string_list *list)
 811 {
 812         int i, result = 0;
 813         const char *argv[12] = { "fetch", "--append" };
 814         int argc = 2;
 815
 816         add_options_to_argv(&argc, argv);
 817
 818         if (!append && !dry_run) {
 819                 int errcode = truncate_fetch_head();
 820                 if (errcode)
 821                         return errcode;
 822         }
 823
 824         for (i = 0; i < list->nr; i++) {
 825                 const char *name = list->items[i].string;
 826                 argv[argc] = name;
 827                 argv[argc + 1] = NULL;
 828                 if (verbosity >= 0)
 829                         printf(_("Fetching %s\n"), name);
 830                 if (run_command_v_opt(argv, RUN_GIT_CMD)) {
 831                         error(_("Could not fetch %s"), name);
 832                         result = 1;
 833                 }
 834         }
 835
 836         return result;
 837 }
 838
 839 static int fetch_one(struct remote *remote, int argc, const char **argv)
 840 {
 841         int i;
 842         static const char **refs = NULL;
 843         struct refspec *refspec;
 844         int ref_nr = 0;
 845         int exit_code;
 846
 847         if (!remote)
 848                 die(_("No remote repository specified.  Please, specify either a URL or a\n"
 849                     "remote name from which new revisions should be fetched."));
 850
 851         transport = transport_get(remote, NULL);
 852         transport_set_verbosity(transport, verbosity, progress);
 853         if (upload_pack)
 854                 set_option(TRANS_OPT_UPLOADPACK, upload_pack);
 855         if (keep)
 856                 set_option(TRANS_OPT_KEEP, "yes");
 857         if (depth)
 858                 set_option(TRANS_OPT_DEPTH, depth);
 859
 860         if (argc > 0) {
 861                 int j = 0;
 862                 refs = xcalloc(argc + 1, sizeof(const char *));
 863                 for (i = 0; i < argc; i++) {
 864                         if (!strcmp(argv[i], "tag")) {
 865                                 char *ref;
 866                                 i++;
 867                                 if (i >= argc)
 868                                         die(_("You need to specify a tag name."));
 869                                 ref = xmalloc(strlen(argv[i]) * 2 + 22);
 870                                 strcpy(ref, "refs/tags/");
 871                                 strcat(ref, argv[i]);
 872                                 strcat(ref, ":refs/tags/");
 873                                 strcat(ref, argv[i]);
 874                                 refs[j++] = ref;
 875                         } else
 876                                 refs[j++] = argv[i];
 877                 }
 878                 refs[j] = NULL;
 879                 ref_nr = j;
 880         }
 881
 882         sigchain_push_common(unlock_pack_on_signal);
 883         atexit(unlock_pack);
 884         refspec = parse_fetch_refspec(ref_nr, refs);
 885         exit_code = do_fetch(transport, refspec, ref_nr);
 886         free(refspec);
 887         transport_disconnect(transport);
 888         transport = NULL;
 889         return exit_code;
 890 }
 891
 892 int cmd_fetch(int argc, const char **argv, const char *prefix)
 893 {
 894         int i;
 895         struct string_list list = STRING_LIST_INIT_NODUP;
 896         struct remote *remote;
 897         int result = 0;
 898
 899         packet_trace_identity("fetch");
 900
 901         /* Record the command line for the reflog */
 902         strbuf_addstr(&default_rla, "fetch");
 903         for (i = 1; i < argc; i++)
 904                 strbuf_addf(&default_rla, " %s", argv[i]);
 905
 906         argc = parse_options(argc, argv, prefix,
 907                              builtin_fetch_options, builtin_fetch_usage, 0);
 908
 909         if (recurse_submodules != RECURSE_SUBMODULES_OFF) {
 910                 if (recurse_submodules_default) {
 911                         int arg = parse_fetch_recurse_submodules_arg("--recurse-submodules-default", recurse_submodules_default);
 912                         set_config_fetch_recurse_submodules(arg);
 913                 }
 914                 gitmodules_config();
 915                 git_config(submodule_config, NULL);
 916         }
 917
 918         if (all) {
 919                 if (argc == 1)
 920                         die(_("fetch --all does not take a repository argument"));
 921                 else if (argc > 1)
 922                         die(_("fetch --all does not make sense with refspecs"));
 923                 (void) for_each_remote(get_one_remote_for_fetch, &list);
 924                 result = fetch_multiple(&list);
 925         } else if (argc == 0) {
 926                 /* No arguments -- use default remote */
 927                 remote = remote_get(NULL);
 928                 result = fetch_one(remote, argc, argv);
 929         } else if (multiple) {
 930                 /* All arguments are assumed to be remotes or groups */
 931                 for (i = 0; i < argc; i++)
 932                         if (!add_remote_or_group(argv[i], &list))
 933                                 die(_("No such remote or remote group: %s"), argv[i]);
 934                 result = fetch_multiple(&list);
 935         } else {
 936                 /* Single remote or group */
 937                 (void) add_remote_or_group(argv[0], &list);
 938                 if (list.nr > 1) {
 939                         /* More than one remote */
 940                         if (argc > 1)
 941                                 die(_("Fetching a group and specifying refspecs does not make sense"));
 942                         result = fetch_multiple(&list);
 943                 } else {
 944                         /* Zero or one remotes */
 945                         remote = remote_get(argv[0]);
 946                         result = fetch_one(remote, argc-1, argv+1);
 947                 }
 948         }
 949
 950         if (!result && (recurse_submodules != RECURSE_SUBMODULES_OFF)) {
 951                 const char *options[10];
 952                 int num_options = 0;
 953                 add_options_to_argv(&num_options, options);
 954                 result = fetch_populated_submodules(num_options, options,
 955                                                     submodule_prefix,
 956                                                     recurse_submodules,
 957                                                     verbosity < 0);
 958         }
 959
 960         /* All names were strdup()ed or strndup()ed */
 961         list.strdup_strings = 1;
 962         string_list_clear(&list, 0);
 963
 964         return result;
 965 }