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 "path-list.h"
   9 #include "remote.h"
  10 #include "transport.h"
  11 #include "run-command.h"
  12
  13 static const char fetch_usage[] = "git-fetch [-a | --append] [--upload-pack <upload-pack>] [-f | --force] [--no-tags] [-t | --tags] [-k | --keep] [-u | --update-head-ok] [--depth <depth>] [-v | --verbose] [<repository> <refspec>...]";
  14
  15 static int append, force, tags, no_tags, update_head_ok, verbose, quiet;
  16 static const char *depth;
  17 static char *default_rla = NULL;
  18 static struct transport *transport;
  19
  20 static void unlock_pack(void)
  21 {
  22         if (transport)
  23                 transport_unlock_pack(transport);
  24 }
  25
  26 static void unlock_pack_on_signal(int signo)
  27 {
  28         unlock_pack();
  29         signal(SIGINT, SIG_DFL);
  30         raise(signo);
  31 }
  32
  33 static void add_merge_config(struct ref **head,
  34                            struct ref *remote_refs,
  35                            struct branch *branch,
  36                            struct ref ***tail)
  37 {
  38         int i;
  39
  40         for (i = 0; i < branch->merge_nr; i++) {
  41                 struct ref *rm, **old_tail = *tail;
  42                 struct refspec refspec;
  43
  44                 for (rm = *head; rm; rm = rm->next) {
  45                         if (branch_merge_matches(branch, i, rm->name)) {
  46                                 rm->merge = 1;
  47                                 break;
  48                         }
  49                 }
  50                 if (rm)
  51                         continue;
  52
  53                 /*
  54                  * Not fetched to a tracking branch?  We need to fetch
  55                  * it anyway to allow this branch's "branch.$name.merge"
  56                  * to be honored by git-pull, but we do not have to
  57                  * fail if branch.$name.merge is misconfigured to point
  58                  * at a nonexisting branch.  If we were indeed called by
  59                  * git-pull, it will notice the misconfiguration because
  60                  * there is no entry in the resulting FETCH_HEAD marked
  61                  * for merging.
  62                  */
  63                 refspec.src = branch->merge[i]->src;
  64                 refspec.dst = NULL;
  65                 refspec.pattern = 0;
  66                 refspec.force = 0;
  67                 get_fetch_map(remote_refs, &refspec, tail, 1);
  68                 for (rm = *old_tail; rm; rm = rm->next)
  69                         rm->merge = 1;
  70         }
  71 }
  72
  73 static struct ref *get_ref_map(struct transport *transport,
  74                                struct refspec *refs, int ref_count, int tags,
  75                                int *autotags)
  76 {
  77         int i;
  78         struct ref *rm;
  79         struct ref *ref_map = NULL;
  80         struct ref **tail = &ref_map;
  81
  82         struct ref *remote_refs = transport_get_remote_refs(transport);
  83
  84         if (ref_count || tags) {
  85                 for (i = 0; i < ref_count; i++) {
  86                         get_fetch_map(remote_refs, &refs[i], &tail, 0);
  87                         if (refs[i].dst && refs[i].dst[0])
  88                                 *autotags = 1;
  89                 }
  90                 /* Merge everything on the command line, but not --tags */
  91                 for (rm = ref_map; rm; rm = rm->next)
  92                         rm->merge = 1;
  93                 if (tags) {
  94                         struct refspec refspec;
  95                         refspec.src = "refs/tags/";
  96                         refspec.dst = "refs/tags/";
  97                         refspec.pattern = 1;
  98                         refspec.force = 0;
  99                         get_fetch_map(remote_refs, &refspec, &tail, 0);
 100                 }
 101         } else {
 102                 /* Use the defaults */
 103                 struct remote *remote = transport->remote;
 104                 struct branch *branch = branch_get(NULL);
 105                 int has_merge = branch_has_merge_config(branch);
 106                 if (remote && (remote->fetch_refspec_nr || has_merge)) {
 107                         for (i = 0; i < remote->fetch_refspec_nr; i++) {
 108                                 get_fetch_map(remote_refs, &remote->fetch[i], &tail, 0);
 109                                 if (remote->fetch[i].dst &&
 110                                     remote->fetch[i].dst[0])
 111                                         *autotags = 1;
 112                                 if (!i && !has_merge && ref_map &&
 113                                     !remote->fetch[0].pattern)
 114                                         ref_map->merge = 1;
 115                         }
 116                         /*
 117                          * if the remote we're fetching from is the same
 118                          * as given in branch.<name>.remote, we add the
 119                          * ref given in branch.<name>.merge, too.
 120                          */
 121                         if (has_merge &&
 122                             !strcmp(branch->remote_name, remote->name))
 123                                 add_merge_config(&ref_map, remote_refs, branch, &tail);
 124                 } else {
 125                         ref_map = get_remote_ref(remote_refs, "HEAD");
 126                         if (!ref_map)
 127                                 die("Couldn't find remote ref HEAD");
 128                         ref_map->merge = 1;
 129                 }
 130         }
 131         ref_remove_duplicates(ref_map);
 132
 133         return ref_map;
 134 }
 135
 136 static int s_update_ref(const char *action,
 137                         struct ref *ref,
 138                         int check_old)
 139 {
 140         char msg[1024];
 141         char *rla = getenv("GIT_REFLOG_ACTION");
 142         static struct ref_lock *lock;
 143
 144         if (!rla)
 145                 rla = default_rla;
 146         snprintf(msg, sizeof(msg), "%s: %s", rla, action);
 147         lock = lock_any_ref_for_update(ref->name,
 148                                        check_old ? ref->old_sha1 : NULL, 0);
 149         if (!lock)
 150                 return 1;
 151         if (write_ref_sha1(lock, ref->new_sha1, msg) < 0)
 152                 return 1;
 153         return 0;
 154 }
 155
 156 #define SUMMARY_WIDTH (2 * DEFAULT_ABBREV + 3)
 157
 158 static int update_local_ref(struct ref *ref,
 159                             const char *remote,
 160                             int verbose,
 161                             char *display)
 162 {
 163         struct commit *current = NULL, *updated;
 164         enum object_type type;
 165         struct branch *current_branch = branch_get(NULL);
 166         const char *pretty_ref = ref->name + (
 167                 !prefixcmp(ref->name, "refs/heads/") ? 11 :
 168                 !prefixcmp(ref->name, "refs/tags/") ? 10 :
 169                 !prefixcmp(ref->name, "refs/remotes/") ? 13 :
 170                 0);
 171
 172         *display = 0;
 173         type = sha1_object_info(ref->new_sha1, NULL);
 174         if (type < 0)
 175                 die("object %s not found", sha1_to_hex(ref->new_sha1));
 176
 177         if (!*ref->name) {
 178                 /* Not storing */
 179                 if (verbose)
 180                         sprintf(display, "* branch %s -> FETCH_HEAD", remote);
 181                 return 0;
 182         }
 183
 184         if (!hashcmp(ref->old_sha1, ref->new_sha1)) {
 185                 if (verbose)
 186                         sprintf(display, "= %-*s %s -> %s", SUMMARY_WIDTH,
 187                                 "[up to date]", remote, pretty_ref);
 188                 return 0;
 189         }
 190
 191         if (current_branch &&
 192             !strcmp(ref->name, current_branch->name) &&
 193             !(update_head_ok || is_bare_repository()) &&
 194             !is_null_sha1(ref->old_sha1)) {
 195                 /*
 196                  * If this is the head, and it's not okay to update
 197                  * the head, and the old value of the head isn't empty...
 198                  */
 199                 sprintf(display, "! %-*s %s -> %s  (can't  fetch in current branch)",
 200                         SUMMARY_WIDTH, "[rejected]", remote, pretty_ref);
 201                 return 1;
 202         }
 203
 204         if (!is_null_sha1(ref->old_sha1) &&
 205             !prefixcmp(ref->name, "refs/tags/")) {
 206                 sprintf(display, "- %-*s %s -> %s",
 207                         SUMMARY_WIDTH, "[tag update]", remote, pretty_ref);
 208                 return s_update_ref("updating tag", ref, 0);
 209         }
 210
 211         current = lookup_commit_reference_gently(ref->old_sha1, 1);
 212         updated = lookup_commit_reference_gently(ref->new_sha1, 1);
 213         if (!current || !updated) {
 214                 const char *msg;
 215                 const char *what;
 216                 if (!strncmp(ref->name, "refs/tags/", 10)) {
 217                         msg = "storing tag";
 218                         what = "[new tag]";
 219                 }
 220                 else {
 221                         msg = "storing head";
 222                         what = "[new branch]";
 223                 }
 224
 225                 sprintf(display, "* %-*s %s -> %s",
 226                         SUMMARY_WIDTH, what, remote, pretty_ref);
 227                 return s_update_ref(msg, ref, 0);
 228         }
 229
 230         if (in_merge_bases(current, &updated, 1)) {
 231                 char quickref[83];
 232                 strcpy(quickref, find_unique_abbrev(current->object.sha1, DEFAULT_ABBREV));
 233                 strcat(quickref, "..");
 234                 strcat(quickref, find_unique_abbrev(ref->new_sha1, DEFAULT_ABBREV));
 235                 sprintf(display, "  %-*s %s -> %s  (fast forward)",
 236                         SUMMARY_WIDTH, quickref, remote, pretty_ref);
 237                 return s_update_ref("fast forward", ref, 1);
 238         } else if (force || ref->force) {
 239                 char quickref[84];
 240                 strcpy(quickref, find_unique_abbrev(current->object.sha1, DEFAULT_ABBREV));
 241                 strcat(quickref, "...");
 242                 strcat(quickref, find_unique_abbrev(ref->new_sha1, DEFAULT_ABBREV));
 243                 sprintf(display, "+ %-*s %s -> %s  (forced update)",
 244                         SUMMARY_WIDTH, quickref, remote, pretty_ref);
 245                 return s_update_ref("forced-update", ref, 1);
 246         } else {
 247                 sprintf(display, "! %-*s %s -> %s  (non fast forward)",
 248                         SUMMARY_WIDTH, "[rejected]", remote, pretty_ref);
 249                 return 1;
 250         }
 251 }
 252
 253 static void store_updated_refs(const char *url, struct ref *ref_map)
 254 {
 255         FILE *fp;
 256         struct commit *commit;
 257         int url_len, i, note_len, shown_url = 0;
 258         char note[1024];
 259         const char *what, *kind;
 260         struct ref *rm;
 261
 262         fp = fopen(git_path("FETCH_HEAD"), "a");
 263         for (rm = ref_map; rm; rm = rm->next) {
 264                 struct ref *ref = NULL;
 265
 266                 if (rm->peer_ref) {
 267                         ref = xcalloc(1, sizeof(*ref) + strlen(rm->peer_ref->name) + 1);
 268                         strcpy(ref->name, rm->peer_ref->name);
 269                         hashcpy(ref->old_sha1, rm->peer_ref->old_sha1);
 270                         hashcpy(ref->new_sha1, rm->old_sha1);
 271                         ref->force = rm->peer_ref->force;
 272                 }
 273
 274                 commit = lookup_commit_reference_gently(rm->old_sha1, 1);
 275                 if (!commit)
 276                         rm->merge = 0;
 277
 278                 if (!strcmp(rm->name, "HEAD")) {
 279                         kind = "";
 280                         what = "";
 281                 }
 282                 else if (!prefixcmp(rm->name, "refs/heads/")) {
 283                         kind = "branch";
 284                         what = rm->name + 11;
 285                 }
 286                 else if (!prefixcmp(rm->name, "refs/tags/")) {
 287                         kind = "tag";
 288                         what = rm->name + 10;
 289                 }
 290                 else if (!prefixcmp(rm->name, "refs/remotes/")) {
 291                         kind = "remote branch";
 292                         what = rm->name + 13;
 293                 }
 294                 else {
 295                         kind = "";
 296                         what = rm->name;
 297                 }
 298
 299                 url_len = strlen(url);
 300                 for (i = url_len - 1; url[i] == '/' && 0 <= i; i--)
 301                         ;
 302                 url_len = i + 1;
 303                 if (4 < i && !strncmp(".git", url + i - 3, 4))
 304                         url_len = i - 3;
 305
 306                 note_len = 0;
 307                 if (*what) {
 308                         if (*kind)
 309                                 note_len += sprintf(note + note_len, "%s ",
 310                                                     kind);
 311                         note_len += sprintf(note + note_len, "'%s' of ", what);
 312                 }
 313                 note_len += sprintf(note + note_len, "%.*s", url_len, url);
 314                 fprintf(fp, "%s\t%s\t%s\n",
 315                         sha1_to_hex(commit ? commit->object.sha1 :
 316                                     rm->old_sha1),
 317                         rm->merge ? "" : "not-for-merge",
 318                         note);
 319
 320                 if (ref) {
 321                         update_local_ref(ref, what, verbose, note);
 322                         if (*note) {
 323                                 if (!shown_url) {
 324                                         fprintf(stderr, "From %.*s\n",
 325                                                         url_len, url);
 326                                         shown_url = 1;
 327                                 }
 328                                 fprintf(stderr, " %s\n", note);
 329                         }
 330                 }
 331         }
 332         fclose(fp);
 333 }
 334
 335 /*
 336  * We would want to bypass the object transfer altogether if
 337  * everything we are going to fetch already exists and connected
 338  * locally.
 339  *
 340  * The refs we are going to fetch are in to_fetch (nr_heads in
 341  * total).  If running
 342  *
 343  *  $ git-rev-list --objects to_fetch[0] to_fetch[1] ... --not --all
 344  *
 345  * does not error out, that means everything reachable from the
 346  * refs we are going to fetch exists and is connected to some of
 347  * our existing refs.
 348  */
 349 static int quickfetch(struct ref *ref_map)
 350 {
 351         struct child_process revlist;
 352         struct ref *ref;
 353         char **argv;
 354         int i, err;
 355
 356         /*
 357          * If we are deepening a shallow clone we already have these
 358          * objects reachable.  Running rev-list here will return with
 359          * a good (0) exit status and we'll bypass the fetch that we
 360          * really need to perform.  Claiming failure now will ensure
 361          * we perform the network exchange to deepen our history.
 362          */
 363         if (depth)
 364                 return -1;
 365
 366         for (i = 0, ref = ref_map; ref; ref = ref->next)
 367                 i++;
 368         if (!i)
 369                 return 0;
 370
 371         argv = xmalloc(sizeof(*argv) * (i + 6));
 372         i = 0;
 373         argv[i++] = xstrdup("rev-list");
 374         argv[i++] = xstrdup("--quiet");
 375         argv[i++] = xstrdup("--objects");
 376         for (ref = ref_map; ref; ref = ref->next)
 377                 argv[i++] = xstrdup(sha1_to_hex(ref->old_sha1));
 378         argv[i++] = xstrdup("--not");
 379         argv[i++] = xstrdup("--all");
 380         argv[i++] = NULL;
 381
 382         memset(&revlist, 0, sizeof(revlist));
 383         revlist.argv = (const char**)argv;
 384         revlist.git_cmd = 1;
 385         revlist.no_stdin = 1;
 386         revlist.no_stdout = 1;
 387         revlist.no_stderr = 1;
 388         err = run_command(&revlist);
 389
 390         for (i = 0; argv[i]; i++)
 391                 free(argv[i]);
 392         free(argv);
 393         return err;
 394 }
 395
 396 static int fetch_refs(struct transport *transport, struct ref *ref_map)
 397 {
 398         int ret = quickfetch(ref_map);
 399         if (ret)
 400                 ret = transport_fetch_refs(transport, ref_map);
 401         if (!ret)
 402                 store_updated_refs(transport->url, ref_map);
 403         transport_unlock_pack(transport);
 404         return ret;
 405 }
 406
 407 static int add_existing(const char *refname, const unsigned char *sha1,
 408                         int flag, void *cbdata)
 409 {
 410         struct path_list *list = (struct path_list *)cbdata;
 411         path_list_insert(refname, list);
 412         return 0;
 413 }
 414
 415 static struct ref *find_non_local_tags(struct transport *transport,
 416                                        struct ref *fetch_map)
 417 {
 418         static struct path_list existing_refs = { NULL, 0, 0, 0 };
 419         struct path_list new_refs = { NULL, 0, 0, 1 };
 420         char *ref_name;
 421         int ref_name_len;
 422         unsigned char *ref_sha1;
 423         struct ref *tag_ref;
 424         struct ref *rm = NULL;
 425         struct ref *ref_map = NULL;
 426         struct ref **tail = &ref_map;
 427         struct ref *ref;
 428
 429         for_each_ref(add_existing, &existing_refs);
 430         for (ref = transport_get_remote_refs(transport); ref; ref = ref->next) {
 431                 if (prefixcmp(ref->name, "refs/tags"))
 432                         continue;
 433
 434                 ref_name = xstrdup(ref->name);
 435                 ref_name_len = strlen(ref_name);
 436                 ref_sha1 = ref->old_sha1;
 437
 438                 if (!strcmp(ref_name + ref_name_len - 3, "^{}")) {
 439                         ref_name[ref_name_len - 3] = 0;
 440                         tag_ref = transport_get_remote_refs(transport);
 441                         while (tag_ref) {
 442                                 if (!strcmp(tag_ref->name, ref_name)) {
 443                                         ref_sha1 = tag_ref->old_sha1;
 444                                         break;
 445                                 }
 446                                 tag_ref = tag_ref->next;
 447                         }
 448                 }
 449
 450                 if (!path_list_has_path(&existing_refs, ref_name) &&
 451                     !path_list_has_path(&new_refs, ref_name) &&
 452                     has_sha1_file(ref->old_sha1)) {
 453                         path_list_insert(ref_name, &new_refs);
 454
 455                         rm = alloc_ref(strlen(ref_name) + 1);
 456                         strcpy(rm->name, ref_name);
 457                         rm->peer_ref = alloc_ref(strlen(ref_name) + 1);
 458                         strcpy(rm->peer_ref->name, ref_name);
 459                         hashcpy(rm->old_sha1, ref_sha1);
 460
 461                         *tail = rm;
 462                         tail = &rm->next;
 463                 }
 464                 free(ref_name);
 465         }
 466
 467         return ref_map;
 468 }
 469
 470 static int do_fetch(struct transport *transport,
 471                     struct refspec *refs, int ref_count)
 472 {
 473         struct ref *ref_map, *fetch_map;
 474         struct ref *rm;
 475         int autotags = (transport->remote->fetch_tags == 1);
 476         if (transport->remote->fetch_tags == 2 && !no_tags)
 477                 tags = 1;
 478         if (transport->remote->fetch_tags == -1)
 479                 no_tags = 1;
 480
 481         if (!transport->get_refs_list || !transport->fetch)
 482                 die("Don't know how to fetch from %s", transport->url);
 483
 484         /* if not appending, truncate FETCH_HEAD */
 485         if (!append)
 486                 fclose(fopen(git_path("FETCH_HEAD"), "w"));
 487
 488         ref_map = get_ref_map(transport, refs, ref_count, tags, &autotags);
 489
 490         for (rm = ref_map; rm; rm = rm->next) {
 491                 if (rm->peer_ref)
 492                         read_ref(rm->peer_ref->name, rm->peer_ref->old_sha1);
 493         }
 494
 495         if (fetch_refs(transport, ref_map)) {
 496                 free_refs(ref_map);
 497                 return 1;
 498         }
 499
 500         fetch_map = ref_map;
 501
 502         /* if neither --no-tags nor --tags was specified, do automated tag
 503          * following ... */
 504         if (!(tags || no_tags) && autotags) {
 505                 ref_map = find_non_local_tags(transport, fetch_map);
 506                 if (ref_map) {
 507                         transport_set_option(transport, TRANS_OPT_DEPTH, "0");
 508                         fetch_refs(transport, ref_map);
 509                 }
 510                 free_refs(ref_map);
 511         }
 512
 513         free_refs(fetch_map);
 514
 515         return 0;
 516 }
 517
 518 static void set_option(const char *name, const char *value)
 519 {
 520         int r = transport_set_option(transport, name, value);
 521         if (r < 0)
 522                 die("Option \"%s\" value \"%s\" is not valid for %s\n",
 523                         name, value, transport->url);
 524         if (r > 0)
 525                 warning("Option \"%s\" is ignored for %s\n",
 526                         name, transport->url);
 527 }
 528
 529 int cmd_fetch(int argc, const char **argv, const char *prefix)
 530 {
 531         struct remote *remote;
 532         int i, j, rla_offset;
 533         static const char **refs = NULL;
 534         int ref_nr = 0;
 535         int cmd_len = 0;
 536         const char *upload_pack = NULL;
 537         int keep = 0;
 538
 539         for (i = 1; i < argc; i++) {
 540                 const char *arg = argv[i];
 541                 cmd_len += strlen(arg);
 542
 543                 if (arg[0] != '-')
 544                         break;
 545                 if (!strcmp(arg, "--append") || !strcmp(arg, "-a")) {
 546                         append = 1;
 547                         continue;
 548                 }
 549                 if (!prefixcmp(arg, "--upload-pack=")) {
 550                         upload_pack = arg + 14;
 551                         continue;
 552                 }
 553                 if (!strcmp(arg, "--upload-pack")) {
 554                         i++;
 555                         if (i == argc)
 556                                 usage(fetch_usage);
 557                         upload_pack = argv[i];
 558                         continue;
 559                 }
 560                 if (!strcmp(arg, "--force") || !strcmp(arg, "-f")) {
 561                         force = 1;
 562                         continue;
 563                 }
 564                 if (!strcmp(arg, "--no-tags")) {
 565                         no_tags = 1;
 566                         continue;
 567                 }
 568                 if (!strcmp(arg, "--tags") || !strcmp(arg, "-t")) {
 569                         tags = 1;
 570                         continue;
 571                 }
 572                 if (!strcmp(arg, "--keep") || !strcmp(arg, "-k")) {
 573                         keep = 1;
 574                         continue;
 575                 }
 576                 if (!strcmp(arg, "--update-head-ok") || !strcmp(arg, "-u")) {
 577                         update_head_ok = 1;
 578                         continue;
 579                 }
 580                 if (!prefixcmp(arg, "--depth=")) {
 581                         depth = arg + 8;
 582                         continue;
 583                 }
 584                 if (!strcmp(arg, "--depth")) {
 585                         i++;
 586                         if (i == argc)
 587                                 usage(fetch_usage);
 588                         depth = argv[i];
 589                         continue;
 590                 }
 591                 if (!strcmp(arg, "--quiet") || !strcmp(arg, "-q")) {
 592                         quiet = 1;
 593                         continue;
 594                 }
 595                 if (!strcmp(arg, "--verbose") || !strcmp(arg, "-v")) {
 596                         verbose++;
 597                         continue;
 598                 }
 599                 usage(fetch_usage);
 600         }
 601
 602         for (j = i; j < argc; j++)
 603                 cmd_len += strlen(argv[j]);
 604
 605         default_rla = xmalloc(cmd_len + 5 + argc + 1);
 606         sprintf(default_rla, "fetch");
 607         rla_offset = strlen(default_rla);
 608         for (j = 1; j < argc; j++) {
 609                 sprintf(default_rla + rla_offset, " %s", argv[j]);
 610                 rla_offset += strlen(argv[j]) + 1;
 611         }
 612
 613         if (i == argc)
 614                 remote = remote_get(NULL);
 615         else
 616                 remote = remote_get(argv[i++]);
 617
 618         transport = transport_get(remote, remote->url[0]);
 619         if (verbose >= 2)
 620                 transport->verbose = 1;
 621         if (quiet)
 622                 transport->verbose = -1;
 623         if (upload_pack)
 624                 set_option(TRANS_OPT_UPLOADPACK, upload_pack);
 625         if (keep)
 626                 set_option(TRANS_OPT_KEEP, "yes");
 627         if (depth)
 628                 set_option(TRANS_OPT_DEPTH, depth);
 629
 630         if (!transport->url)
 631                 die("Where do you want to fetch from today?");
 632
 633         if (i < argc) {
 634                 int j = 0;
 635                 refs = xcalloc(argc - i + 1, sizeof(const char *));
 636                 while (i < argc) {
 637                         if (!strcmp(argv[i], "tag")) {
 638                                 char *ref;
 639                                 i++;
 640                                 ref = xmalloc(strlen(argv[i]) * 2 + 22);
 641                                 strcpy(ref, "refs/tags/");
 642                                 strcat(ref, argv[i]);
 643                                 strcat(ref, ":refs/tags/");
 644                                 strcat(ref, argv[i]);
 645                                 refs[j++] = ref;
 646                         } else
 647                                 refs[j++] = argv[i];
 648                         i++;
 649                 }
 650                 refs[j] = NULL;
 651                 ref_nr = j;
 652         }
 653
 654         signal(SIGINT, unlock_pack_on_signal);
 655         atexit(unlock_pack);
 656         return do_fetch(transport, parse_ref_spec(ref_nr, refs), ref_nr);
 657 }