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 #include "parse-options.h"
  13
  14 static const char * const builtin_fetch_usage[] = {
  15         "git-fetch [options] [<repository> <refspec>...]",
  16         NULL
  17 };
  18
  19 enum {
  20         TAGS_UNSET = 0,
  21         TAGS_DEFAULT = 1,
  22         TAGS_SET = 2
  23 };
  24
  25 static int append, force, keep, update_head_ok, verbose, quiet;
  26 static int tags = TAGS_DEFAULT;
  27 static const char *depth;
  28 static const char *upload_pack;
  29 static struct strbuf default_rla = STRBUF_INIT;
  30 static struct transport *transport;
  31
  32 static struct option builtin_fetch_options[] = {
  33         OPT__QUIET(&quiet),
  34         OPT__VERBOSE(&verbose),
  35         OPT_BOOLEAN('a', "append", &append,
  36                     "append to .git/FETCH_HEAD instead of overwriting"),
  37         OPT_STRING(0, "upload-pack", &upload_pack, "PATH",
  38                    "path to upload pack on remote end"),
  39         OPT_BOOLEAN('f', "force", &force,
  40                     "force overwrite of local branch"),
  41         OPT_SET_INT('t', "tags", &tags,
  42                     "fetch all tags and associated objects", TAGS_SET),
  43         OPT_SET_INT('n', NULL, &tags,
  44                     "do not fetch all tags (--no-tags)", TAGS_UNSET),
  45         OPT_BOOLEAN('k', "keep", &keep, "keep downloaded pack"),
  46         OPT_BOOLEAN('u', "update-head-ok", &update_head_ok,
  47                     "allow updating of HEAD ref"),
  48         OPT_STRING(0, "depth", &depth, "DEPTH",
  49                    "deepen history of shallow clone"),
  50         OPT_END()
  51 };
  52
  53 static void unlock_pack(void)
  54 {
  55         if (transport)
  56                 transport_unlock_pack(transport);
  57 }
  58
  59 static void unlock_pack_on_signal(int signo)
  60 {
  61         unlock_pack();
  62         signal(SIGINT, SIG_DFL);
  63         raise(signo);
  64 }
  65
  66 static void add_merge_config(struct ref **head,
  67                            const struct ref *remote_refs,
  68                            struct branch *branch,
  69                            struct ref ***tail)
  70 {
  71         int i;
  72
  73         for (i = 0; i < branch->merge_nr; i++) {
  74                 struct ref *rm, **old_tail = *tail;
  75                 struct refspec refspec;
  76
  77                 for (rm = *head; rm; rm = rm->next) {
  78                         if (branch_merge_matches(branch, i, rm->name)) {
  79                                 rm->merge = 1;
  80                                 break;
  81                         }
  82                 }
  83                 if (rm)
  84                         continue;
  85
  86                 /*
  87                  * Not fetched to a tracking branch?  We need to fetch
  88                  * it anyway to allow this branch's "branch.$name.merge"
  89                  * to be honored by git-pull, but we do not have to
  90                  * fail if branch.$name.merge is misconfigured to point
  91                  * at a nonexisting branch.  If we were indeed called by
  92                  * git-pull, it will notice the misconfiguration because
  93                  * there is no entry in the resulting FETCH_HEAD marked
  94                  * for merging.
  95                  */
  96                 refspec.src = branch->merge[i]->src;
  97                 refspec.dst = NULL;
  98                 refspec.pattern = 0;
  99                 refspec.force = 0;
 100                 get_fetch_map(remote_refs, &refspec, tail, 1);
 101                 for (rm = *old_tail; rm; rm = rm->next)
 102                         rm->merge = 1;
 103         }
 104 }
 105
 106 static void find_non_local_tags(struct transport *transport,
 107                         struct ref **head,
 108                         struct ref ***tail);
 109
 110 static struct ref *get_ref_map(struct transport *transport,
 111                                struct refspec *refs, int ref_count, int tags,
 112                                int *autotags)
 113 {
 114         int i;
 115         struct ref *rm;
 116         struct ref *ref_map = NULL;
 117         struct ref **tail = &ref_map;
 118
 119         const struct ref *remote_refs = transport_get_remote_refs(transport);
 120
 121         if (ref_count || tags == TAGS_SET) {
 122                 for (i = 0; i < ref_count; i++) {
 123                         get_fetch_map(remote_refs, &refs[i], &tail, 0);
 124                         if (refs[i].dst && refs[i].dst[0])
 125                                 *autotags = 1;
 126                 }
 127                 /* Merge everything on the command line, but not --tags */
 128                 for (rm = ref_map; rm; rm = rm->next)
 129                         rm->merge = 1;
 130                 if (tags == TAGS_SET)
 131                         get_fetch_map(remote_refs, tag_refspec, &tail, 0);
 132         } else {
 133                 /* Use the defaults */
 134                 struct remote *remote = transport->remote;
 135                 struct branch *branch = branch_get(NULL);
 136                 int has_merge = branch_has_merge_config(branch);
 137                 if (remote && (remote->fetch_refspec_nr || has_merge)) {
 138                         for (i = 0; i < remote->fetch_refspec_nr; i++) {
 139                                 get_fetch_map(remote_refs, &remote->fetch[i], &tail, 0);
 140                                 if (remote->fetch[i].dst &&
 141                                     remote->fetch[i].dst[0])
 142                                         *autotags = 1;
 143                                 if (!i && !has_merge && ref_map &&
 144                                     !remote->fetch[0].pattern)
 145                                         ref_map->merge = 1;
 146                         }
 147                         /*
 148                          * if the remote we're fetching from is the same
 149                          * as given in branch.<name>.remote, we add the
 150                          * ref given in branch.<name>.merge, too.
 151                          */
 152                         if (has_merge &&
 153                             !strcmp(branch->remote_name, remote->name))
 154                                 add_merge_config(&ref_map, remote_refs, branch, &tail);
 155                 } else {
 156                         ref_map = get_remote_ref(remote_refs, "HEAD");
 157                         if (!ref_map)
 158                                 die("Couldn't find remote ref HEAD");
 159                         ref_map->merge = 1;
 160                         tail = &ref_map->next;
 161                 }
 162         }
 163         if (tags == TAGS_DEFAULT && *autotags)
 164                 find_non_local_tags(transport, &ref_map, &tail);
 165         ref_remove_duplicates(ref_map);
 166
 167         return ref_map;
 168 }
 169
 170 static int s_update_ref(const char *action,
 171                         struct ref *ref,
 172                         int check_old)
 173 {
 174         char msg[1024];
 175         char *rla = getenv("GIT_REFLOG_ACTION");
 176         static struct ref_lock *lock;
 177
 178         if (!rla)
 179                 rla = default_rla.buf;
 180         snprintf(msg, sizeof(msg), "%s: %s", rla, action);
 181         lock = lock_any_ref_for_update(ref->name,
 182                                        check_old ? ref->old_sha1 : NULL, 0);
 183         if (!lock)
 184                 return 1;
 185         if (write_ref_sha1(lock, ref->new_sha1, msg) < 0)
 186                 return 1;
 187         return 0;
 188 }
 189
 190 #define SUMMARY_WIDTH (2 * DEFAULT_ABBREV + 3)
 191 #define REFCOL_WIDTH  10
 192
 193 static int update_local_ref(struct ref *ref,
 194                             const char *remote,
 195                             int verbose,
 196                             char *display)
 197 {
 198         struct commit *current = NULL, *updated;
 199         enum object_type type;
 200         struct branch *current_branch = branch_get(NULL);
 201         const char *pretty_ref = ref->name + (
 202                 !prefixcmp(ref->name, "refs/heads/") ? 11 :
 203                 !prefixcmp(ref->name, "refs/tags/") ? 10 :
 204                 !prefixcmp(ref->name, "refs/remotes/") ? 13 :
 205                 0);
 206
 207         *display = 0;
 208         type = sha1_object_info(ref->new_sha1, NULL);
 209         if (type < 0)
 210                 die("object %s not found", sha1_to_hex(ref->new_sha1));
 211
 212         if (!hashcmp(ref->old_sha1, ref->new_sha1)) {
 213                 if (verbose)
 214                         sprintf(display, "= %-*s %-*s -> %s", SUMMARY_WIDTH,
 215                                 "[up to date]", REFCOL_WIDTH, remote,
 216                                 pretty_ref);
 217                 return 0;
 218         }
 219
 220         if (current_branch &&
 221             !strcmp(ref->name, current_branch->name) &&
 222             !(update_head_ok || is_bare_repository()) &&
 223             !is_null_sha1(ref->old_sha1)) {
 224                 /*
 225                  * If this is the head, and it's not okay to update
 226                  * the head, and the old value of the head isn't empty...
 227                  */
 228                 sprintf(display, "! %-*s %-*s -> %s  (can't fetch in current branch)",
 229                         SUMMARY_WIDTH, "[rejected]", REFCOL_WIDTH, remote,
 230                         pretty_ref);
 231                 return 1;
 232         }
 233
 234         if (!is_null_sha1(ref->old_sha1) &&
 235             !prefixcmp(ref->name, "refs/tags/")) {
 236                 int r;
 237                 r = s_update_ref("updating tag", ref, 0);
 238                 sprintf(display, "%c %-*s %-*s -> %s%s", r ? '!' : '-',
 239                         SUMMARY_WIDTH, "[tag update]", REFCOL_WIDTH, remote,
 240                         pretty_ref, r ? "  (unable to update local ref)" : "");
 241                 return r;
 242         }
 243
 244         current = lookup_commit_reference_gently(ref->old_sha1, 1);
 245         updated = lookup_commit_reference_gently(ref->new_sha1, 1);
 246         if (!current || !updated) {
 247                 const char *msg;
 248                 const char *what;
 249                 int r;
 250                 if (!strncmp(ref->name, "refs/tags/", 10)) {
 251                         msg = "storing tag";
 252                         what = "[new tag]";
 253                 }
 254                 else {
 255                         msg = "storing head";
 256                         what = "[new branch]";
 257                 }
 258
 259                 r = s_update_ref(msg, ref, 0);
 260                 sprintf(display, "%c %-*s %-*s -> %s%s", r ? '!' : '*',
 261                         SUMMARY_WIDTH, what, REFCOL_WIDTH, remote, pretty_ref,
 262                         r ? "  (unable to update local ref)" : "");
 263                 return r;
 264         }
 265
 266         if (in_merge_bases(current, &updated, 1)) {
 267                 char quickref[83];
 268                 int r;
 269                 strcpy(quickref, find_unique_abbrev(current->object.sha1, DEFAULT_ABBREV));
 270                 strcat(quickref, "..");
 271                 strcat(quickref, find_unique_abbrev(ref->new_sha1, DEFAULT_ABBREV));
 272                 r = s_update_ref("fast forward", ref, 1);
 273                 sprintf(display, "%c %-*s %-*s -> %s%s", r ? '!' : ' ',
 274                         SUMMARY_WIDTH, quickref, REFCOL_WIDTH, remote,
 275                         pretty_ref, r ? "  (unable to update local ref)" : "");
 276                 return r;
 277         } else if (force || ref->force) {
 278                 char quickref[84];
 279                 int r;
 280                 strcpy(quickref, find_unique_abbrev(current->object.sha1, DEFAULT_ABBREV));
 281                 strcat(quickref, "...");
 282                 strcat(quickref, find_unique_abbrev(ref->new_sha1, DEFAULT_ABBREV));
 283                 r = s_update_ref("forced-update", ref, 1);
 284                 sprintf(display, "%c %-*s %-*s -> %s  (%s)", r ? '!' : '+',
 285                         SUMMARY_WIDTH, quickref, REFCOL_WIDTH, remote,
 286                         pretty_ref,
 287                         r ? "unable to update local ref" : "forced update");
 288                 return r;
 289         } else {
 290                 sprintf(display, "! %-*s %-*s -> %s  (non fast forward)",
 291                         SUMMARY_WIDTH, "[rejected]", REFCOL_WIDTH, remote,
 292                         pretty_ref);
 293                 return 1;
 294         }
 295 }
 296
 297 static int store_updated_refs(const char *url, struct ref *ref_map)
 298 {
 299         FILE *fp;
 300         struct commit *commit;
 301         int url_len, i, note_len, shown_url = 0, rc = 0;
 302         char note[1024];
 303         const char *what, *kind;
 304         struct ref *rm;
 305         char *filename = git_path("FETCH_HEAD");
 306
 307         fp = fopen(filename, "a");
 308         if (!fp)
 309                 return error("cannot open %s: %s\n", filename, strerror(errno));
 310         for (rm = ref_map; rm; rm = rm->next) {
 311                 struct ref *ref = NULL;
 312
 313                 if (rm->peer_ref) {
 314                         ref = xcalloc(1, sizeof(*ref) + strlen(rm->peer_ref->name) + 1);
 315                         strcpy(ref->name, rm->peer_ref->name);
 316                         hashcpy(ref->old_sha1, rm->peer_ref->old_sha1);
 317                         hashcpy(ref->new_sha1, rm->old_sha1);
 318                         ref->force = rm->peer_ref->force;
 319                 }
 320
 321                 commit = lookup_commit_reference_gently(rm->old_sha1, 1);
 322                 if (!commit)
 323                         rm->merge = 0;
 324
 325                 if (!strcmp(rm->name, "HEAD")) {
 326                         kind = "";
 327                         what = "";
 328                 }
 329                 else if (!prefixcmp(rm->name, "refs/heads/")) {
 330                         kind = "branch";
 331                         what = rm->name + 11;
 332                 }
 333                 else if (!prefixcmp(rm->name, "refs/tags/")) {
 334                         kind = "tag";
 335                         what = rm->name + 10;
 336                 }
 337                 else if (!prefixcmp(rm->name, "refs/remotes/")) {
 338                         kind = "remote branch";
 339                         what = rm->name + 13;
 340                 }
 341                 else {
 342                         kind = "";
 343                         what = rm->name;
 344                 }
 345
 346                 url_len = strlen(url);
 347                 for (i = url_len - 1; url[i] == '/' && 0 <= i; i--)
 348                         ;
 349                 url_len = i + 1;
 350                 if (4 < i && !strncmp(".git", url + i - 3, 4))
 351                         url_len = i - 3;
 352
 353                 note_len = 0;
 354                 if (*what) {
 355                         if (*kind)
 356                                 note_len += sprintf(note + note_len, "%s ",
 357                                                     kind);
 358                         note_len += sprintf(note + note_len, "'%s' of ", what);
 359                 }
 360                 note_len += sprintf(note + note_len, "%.*s", url_len, url);
 361                 fprintf(fp, "%s\t%s\t%s\n",
 362                         sha1_to_hex(commit ? commit->object.sha1 :
 363                                     rm->old_sha1),
 364                         rm->merge ? "" : "not-for-merge",
 365                         note);
 366
 367                 if (ref)
 368                         rc |= update_local_ref(ref, what, verbose, note);
 369                 else
 370                         sprintf(note, "* %-*s %-*s -> FETCH_HEAD",
 371                                 SUMMARY_WIDTH, *kind ? kind : "branch",
 372                                  REFCOL_WIDTH, *what ? what : "HEAD");
 373                 if (*note) {
 374                         if (!shown_url) {
 375                                 fprintf(stderr, "From %.*s\n",
 376                                                 url_len, url);
 377                                 shown_url = 1;
 378                         }
 379                         fprintf(stderr, " %s\n", note);
 380                 }
 381         }
 382         fclose(fp);
 383         return rc;
 384 }
 385
 386 /*
 387  * We would want to bypass the object transfer altogether if
 388  * everything we are going to fetch already exists and connected
 389  * locally.
 390  *
 391  * The refs we are going to fetch are in to_fetch (nr_heads in
 392  * total).  If running
 393  *
 394  *  $ git-rev-list --objects to_fetch[0] to_fetch[1] ... --not --all
 395  *
 396  * does not error out, that means everything reachable from the
 397  * refs we are going to fetch exists and is connected to some of
 398  * our existing refs.
 399  */
 400 static int quickfetch(struct ref *ref_map)
 401 {
 402         struct child_process revlist;
 403         struct ref *ref;
 404         char **argv;
 405         int i, err;
 406
 407         /*
 408          * If we are deepening a shallow clone we already have these
 409          * objects reachable.  Running rev-list here will return with
 410          * a good (0) exit status and we'll bypass the fetch that we
 411          * really need to perform.  Claiming failure now will ensure
 412          * we perform the network exchange to deepen our history.
 413          */
 414         if (depth)
 415                 return -1;
 416
 417         for (i = 0, ref = ref_map; ref; ref = ref->next)
 418                 i++;
 419         if (!i)
 420                 return 0;
 421
 422         argv = xmalloc(sizeof(*argv) * (i + 6));
 423         i = 0;
 424         argv[i++] = xstrdup("rev-list");
 425         argv[i++] = xstrdup("--quiet");
 426         argv[i++] = xstrdup("--objects");
 427         for (ref = ref_map; ref; ref = ref->next)
 428                 argv[i++] = xstrdup(sha1_to_hex(ref->old_sha1));
 429         argv[i++] = xstrdup("--not");
 430         argv[i++] = xstrdup("--all");
 431         argv[i++] = NULL;
 432
 433         memset(&revlist, 0, sizeof(revlist));
 434         revlist.argv = (const char**)argv;
 435         revlist.git_cmd = 1;
 436         revlist.no_stdin = 1;
 437         revlist.no_stdout = 1;
 438         revlist.no_stderr = 1;
 439         err = run_command(&revlist);
 440
 441         for (i = 0; argv[i]; i++)
 442                 free(argv[i]);
 443         free(argv);
 444         return err;
 445 }
 446
 447 static int fetch_refs(struct transport *transport, struct ref *ref_map)
 448 {
 449         int ret = quickfetch(ref_map);
 450         if (ret)
 451                 ret = transport_fetch_refs(transport, ref_map);
 452         if (!ret)
 453                 ret |= store_updated_refs(transport->url, ref_map);
 454         transport_unlock_pack(transport);
 455         return ret;
 456 }
 457
 458 static int add_existing(const char *refname, const unsigned char *sha1,
 459                         int flag, void *cbdata)
 460 {
 461         struct path_list *list = (struct path_list *)cbdata;
 462         path_list_insert(refname, list);
 463         return 0;
 464 }
 465
 466 static int will_fetch(struct ref **head, const unsigned char *sha1)
 467 {
 468         struct ref *rm = *head;
 469         while (rm) {
 470                 if (!hashcmp(rm->old_sha1, sha1))
 471                         return 1;
 472                 rm = rm->next;
 473         }
 474         return 0;
 475 }
 476
 477 static void find_non_local_tags(struct transport *transport,
 478                         struct ref **head,
 479                         struct ref ***tail)
 480 {
 481         struct path_list existing_refs = { NULL, 0, 0, 0 };
 482         struct path_list new_refs = { NULL, 0, 0, 1 };
 483         char *ref_name;
 484         int ref_name_len;
 485         const unsigned char *ref_sha1;
 486         const struct ref *tag_ref;
 487         struct ref *rm = NULL;
 488         const struct ref *ref;
 489
 490         for_each_ref(add_existing, &existing_refs);
 491         for (ref = transport_get_remote_refs(transport); ref; ref = ref->next) {
 492                 if (prefixcmp(ref->name, "refs/tags"))
 493                         continue;
 494
 495                 ref_name = xstrdup(ref->name);
 496                 ref_name_len = strlen(ref_name);
 497                 ref_sha1 = ref->old_sha1;
 498
 499                 if (!strcmp(ref_name + ref_name_len - 3, "^{}")) {
 500                         ref_name[ref_name_len - 3] = 0;
 501                         tag_ref = transport_get_remote_refs(transport);
 502                         while (tag_ref) {
 503                                 if (!strcmp(tag_ref->name, ref_name)) {
 504                                         ref_sha1 = tag_ref->old_sha1;
 505                                         break;
 506                                 }
 507                                 tag_ref = tag_ref->next;
 508                         }
 509                 }
 510
 511                 if (!path_list_has_path(&existing_refs, ref_name) &&
 512                     !path_list_has_path(&new_refs, ref_name) &&
 513                     (has_sha1_file(ref->old_sha1) ||
 514                      will_fetch(head, ref->old_sha1))) {
 515                         path_list_insert(ref_name, &new_refs);
 516
 517                         rm = alloc_ref_from_str(ref_name);
 518                         rm->peer_ref = alloc_ref_from_str(ref_name);
 519                         hashcpy(rm->old_sha1, ref_sha1);
 520
 521                         **tail = rm;
 522                         *tail = &rm->next;
 523                 }
 524                 free(ref_name);
 525         }
 526         path_list_clear(&existing_refs, 0);
 527         path_list_clear(&new_refs, 0);
 528 }
 529
 530 static int do_fetch(struct transport *transport,
 531                     struct refspec *refs, int ref_count)
 532 {
 533         struct ref *ref_map;
 534         struct ref *rm;
 535         int autotags = (transport->remote->fetch_tags == 1);
 536         if (transport->remote->fetch_tags == 2 && tags != TAGS_UNSET)
 537                 tags = TAGS_SET;
 538         if (transport->remote->fetch_tags == -1)
 539                 tags = TAGS_UNSET;
 540
 541         if (!transport->get_refs_list || !transport->fetch)
 542                 die("Don't know how to fetch from %s", transport->url);
 543
 544         /* if not appending, truncate FETCH_HEAD */
 545         if (!append) {
 546                 char *filename = git_path("FETCH_HEAD");
 547                 FILE *fp = fopen(filename, "w");
 548                 if (!fp)
 549                         return error("cannot open %s: %s\n", filename, strerror(errno));
 550                 fclose(fp);
 551         }
 552
 553         ref_map = get_ref_map(transport, refs, ref_count, tags, &autotags);
 554
 555         for (rm = ref_map; rm; rm = rm->next) {
 556                 if (rm->peer_ref)
 557                         read_ref(rm->peer_ref->name, rm->peer_ref->old_sha1);
 558         }
 559
 560         if (tags == TAGS_DEFAULT && autotags)
 561                 transport_set_option(transport, TRANS_OPT_FOLLOWTAGS, "1");
 562         if (fetch_refs(transport, ref_map)) {
 563                 free_refs(ref_map);
 564                 return 1;
 565         }
 566         free_refs(ref_map);
 567
 568         /* if neither --no-tags nor --tags was specified, do automated tag
 569          * following ... */
 570         if (tags == TAGS_DEFAULT && autotags) {
 571                 struct ref **tail = &ref_map;
 572                 ref_map = NULL;
 573                 find_non_local_tags(transport, &ref_map, &tail);
 574                 if (ref_map) {
 575                         transport_set_option(transport, TRANS_OPT_FOLLOWTAGS, NULL);
 576                         transport_set_option(transport, TRANS_OPT_DEPTH, "0");
 577                         fetch_refs(transport, ref_map);
 578                 }
 579                 free_refs(ref_map);
 580         }
 581
 582         return 0;
 583 }
 584
 585 static void set_option(const char *name, const char *value)
 586 {
 587         int r = transport_set_option(transport, name, value);
 588         if (r < 0)
 589                 die("Option \"%s\" value \"%s\" is not valid for %s\n",
 590                         name, value, transport->url);
 591         if (r > 0)
 592                 warning("Option \"%s\" is ignored for %s\n",
 593                         name, transport->url);
 594 }
 595
 596 int cmd_fetch(int argc, const char **argv, const char *prefix)
 597 {
 598         struct remote *remote;
 599         int i;
 600         static const char **refs = NULL;
 601         int ref_nr = 0;
 602         int exit_code;
 603
 604         /* Record the command line for the reflog */
 605         strbuf_addstr(&default_rla, "fetch");
 606         for (i = 1; i < argc; i++)
 607                 strbuf_addf(&default_rla, " %s", argv[i]);
 608
 609         argc = parse_options(argc, argv,
 610                              builtin_fetch_options, builtin_fetch_usage, 0);
 611
 612         if (argc == 0)
 613                 remote = remote_get(NULL);
 614         else
 615                 remote = remote_get(argv[0]);
 616
 617         transport = transport_get(remote, remote->url[0]);
 618         if (verbose >= 2)
 619                 transport->verbose = 1;
 620         if (quiet)
 621                 transport->verbose = -1;
 622         if (upload_pack)
 623                 set_option(TRANS_OPT_UPLOADPACK, upload_pack);
 624         if (keep)
 625                 set_option(TRANS_OPT_KEEP, "yes");
 626         if (depth)
 627                 set_option(TRANS_OPT_DEPTH, depth);
 628
 629         if (!transport->url)
 630                 die("Where do you want to fetch from today?");
 631
 632         if (argc > 1) {
 633                 int j = 0;
 634                 refs = xcalloc(argc + 1, sizeof(const char *));
 635                 for (i = 1; i < argc; i++) {
 636                         if (!strcmp(argv[i], "tag")) {
 637                                 char *ref;
 638                                 i++;
 639                                 if (i >= argc)
 640                                         die("You need to specify a tag name.");
 641                                 ref = xmalloc(strlen(argv[i]) * 2 + 22);
 642                                 strcpy(ref, "refs/tags/");
 643                                 strcat(ref, argv[i]);
 644                                 strcat(ref, ":refs/tags/");
 645                                 strcat(ref, argv[i]);
 646                                 refs[j++] = ref;
 647                         } else
 648                                 refs[j++] = argv[i];
 649                 }
 650                 refs[j] = NULL;
 651                 ref_nr = j;
 652         }
 653
 654         signal(SIGINT, unlock_pack_on_signal);
 655         atexit(unlock_pack);
 656         exit_code = do_fetch(transport,
 657                         parse_fetch_refspec(ref_nr, refs), ref_nr);
 658         transport_disconnect(transport);
 659         transport = NULL;
 660         return exit_code;
 661 }