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                         struct refspec refspec;
 132                         refspec.src = "refs/tags/";
 133                         refspec.dst = "refs/tags/";
 134                         refspec.pattern = 1;
 135                         refspec.force = 0;
 136                         get_fetch_map(remote_refs, &refspec, &tail, 0);
 137                 }
 138         } else {
 139                 /* Use the defaults */
 140                 struct remote *remote = transport->remote;
 141                 struct branch *branch = branch_get(NULL);
 142                 int has_merge = branch_has_merge_config(branch);
 143                 if (remote && (remote->fetch_refspec_nr || has_merge)) {
 144                         for (i = 0; i < remote->fetch_refspec_nr; i++) {
 145                                 get_fetch_map(remote_refs, &remote->fetch[i], &tail, 0);
 146                                 if (remote->fetch[i].dst &&
 147                                     remote->fetch[i].dst[0])
 148                                         *autotags = 1;
 149                                 if (!i && !has_merge && ref_map &&
 150                                     !remote->fetch[0].pattern)
 151                                         ref_map->merge = 1;
 152                         }
 153                         /*
 154                          * if the remote we're fetching from is the same
 155                          * as given in branch.<name>.remote, we add the
 156                          * ref given in branch.<name>.merge, too.
 157                          */
 158                         if (has_merge &&
 159                             !strcmp(branch->remote_name, remote->name))
 160                                 add_merge_config(&ref_map, remote_refs, branch, &tail);
 161                 } else {
 162                         ref_map = get_remote_ref(remote_refs, "HEAD");
 163                         if (!ref_map)
 164                                 die("Couldn't find remote ref HEAD");
 165                         ref_map->merge = 1;
 166                         tail = &ref_map->next;
 167                 }
 168         }
 169         if (tags == TAGS_DEFAULT && *autotags)
 170                 find_non_local_tags(transport, &ref_map, &tail);
 171         ref_remove_duplicates(ref_map);
 172
 173         return ref_map;
 174 }
 175
 176 static int s_update_ref(const char *action,
 177                         struct ref *ref,
 178                         int check_old)
 179 {
 180         char msg[1024];
 181         char *rla = getenv("GIT_REFLOG_ACTION");
 182         static struct ref_lock *lock;
 183
 184         if (!rla)
 185                 rla = default_rla.buf;
 186         snprintf(msg, sizeof(msg), "%s: %s", rla, action);
 187         lock = lock_any_ref_for_update(ref->name,
 188                                        check_old ? ref->old_sha1 : NULL, 0);
 189         if (!lock)
 190                 return 1;
 191         if (write_ref_sha1(lock, ref->new_sha1, msg) < 0)
 192                 return 1;
 193         return 0;
 194 }
 195
 196 #define SUMMARY_WIDTH (2 * DEFAULT_ABBREV + 3)
 197 #define REFCOL_WIDTH  10
 198
 199 static int update_local_ref(struct ref *ref,
 200                             const char *remote,
 201                             int verbose,
 202                             char *display)
 203 {
 204         struct commit *current = NULL, *updated;
 205         enum object_type type;
 206         struct branch *current_branch = branch_get(NULL);
 207         const char *pretty_ref = ref->name + (
 208                 !prefixcmp(ref->name, "refs/heads/") ? 11 :
 209                 !prefixcmp(ref->name, "refs/tags/") ? 10 :
 210                 !prefixcmp(ref->name, "refs/remotes/") ? 13 :
 211                 0);
 212
 213         *display = 0;
 214         type = sha1_object_info(ref->new_sha1, NULL);
 215         if (type < 0)
 216                 die("object %s not found", sha1_to_hex(ref->new_sha1));
 217
 218         if (!hashcmp(ref->old_sha1, ref->new_sha1)) {
 219                 if (verbose)
 220                         sprintf(display, "= %-*s %-*s -> %s", SUMMARY_WIDTH,
 221                                 "[up to date]", REFCOL_WIDTH, remote,
 222                                 pretty_ref);
 223                 return 0;
 224         }
 225
 226         if (current_branch &&
 227             !strcmp(ref->name, current_branch->name) &&
 228             !(update_head_ok || is_bare_repository()) &&
 229             !is_null_sha1(ref->old_sha1)) {
 230                 /*
 231                  * If this is the head, and it's not okay to update
 232                  * the head, and the old value of the head isn't empty...
 233                  */
 234                 sprintf(display, "! %-*s %-*s -> %s  (can't fetch in current branch)",
 235                         SUMMARY_WIDTH, "[rejected]", REFCOL_WIDTH, remote,
 236                         pretty_ref);
 237                 return 1;
 238         }
 239
 240         if (!is_null_sha1(ref->old_sha1) &&
 241             !prefixcmp(ref->name, "refs/tags/")) {
 242                 sprintf(display, "- %-*s %-*s -> %s",
 243                         SUMMARY_WIDTH, "[tag update]", REFCOL_WIDTH, remote,
 244                         pretty_ref);
 245                 return s_update_ref("updating tag", ref, 0);
 246         }
 247
 248         current = lookup_commit_reference_gently(ref->old_sha1, 1);
 249         updated = lookup_commit_reference_gently(ref->new_sha1, 1);
 250         if (!current || !updated) {
 251                 const char *msg;
 252                 const char *what;
 253                 if (!strncmp(ref->name, "refs/tags/", 10)) {
 254                         msg = "storing tag";
 255                         what = "[new tag]";
 256                 }
 257                 else {
 258                         msg = "storing head";
 259                         what = "[new branch]";
 260                 }
 261
 262                 sprintf(display, "* %-*s %-*s -> %s", SUMMARY_WIDTH, what,
 263                         REFCOL_WIDTH, remote, pretty_ref);
 264                 return s_update_ref(msg, ref, 0);
 265         }
 266
 267         if (in_merge_bases(current, &updated, 1)) {
 268                 char quickref[83];
 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                 sprintf(display, "  %-*s %-*s -> %s", SUMMARY_WIDTH, quickref,
 273                         REFCOL_WIDTH, remote, pretty_ref);
 274                 return s_update_ref("fast forward", ref, 1);
 275         } else if (force || ref->force) {
 276                 char quickref[84];
 277                 strcpy(quickref, find_unique_abbrev(current->object.sha1, DEFAULT_ABBREV));
 278                 strcat(quickref, "...");
 279                 strcat(quickref, find_unique_abbrev(ref->new_sha1, DEFAULT_ABBREV));
 280                 sprintf(display, "+ %-*s %-*s -> %s  (forced update)",
 281                         SUMMARY_WIDTH, quickref, REFCOL_WIDTH, remote, pretty_ref);
 282                 return s_update_ref("forced-update", ref, 1);
 283         } else {
 284                 sprintf(display, "! %-*s %-*s -> %s  (non fast forward)",
 285                         SUMMARY_WIDTH, "[rejected]", REFCOL_WIDTH, remote,
 286                         pretty_ref);
 287                 return 1;
 288         }
 289 }
 290
 291 static int store_updated_refs(const char *url, struct ref *ref_map)
 292 {
 293         FILE *fp;
 294         struct commit *commit;
 295         int url_len, i, note_len, shown_url = 0;
 296         char note[1024];
 297         const char *what, *kind;
 298         struct ref *rm;
 299         char *filename = git_path("FETCH_HEAD");
 300
 301         fp = fopen(filename, "a");
 302         if (!fp)
 303                 return error("cannot open %s: %s\n", filename, strerror(errno));
 304         for (rm = ref_map; rm; rm = rm->next) {
 305                 struct ref *ref = NULL;
 306
 307                 if (rm->peer_ref) {
 308                         ref = xcalloc(1, sizeof(*ref) + strlen(rm->peer_ref->name) + 1);
 309                         strcpy(ref->name, rm->peer_ref->name);
 310                         hashcpy(ref->old_sha1, rm->peer_ref->old_sha1);
 311                         hashcpy(ref->new_sha1, rm->old_sha1);
 312                         ref->force = rm->peer_ref->force;
 313                 }
 314
 315                 commit = lookup_commit_reference_gently(rm->old_sha1, 1);
 316                 if (!commit)
 317                         rm->merge = 0;
 318
 319                 if (!strcmp(rm->name, "HEAD")) {
 320                         kind = "";
 321                         what = "";
 322                 }
 323                 else if (!prefixcmp(rm->name, "refs/heads/")) {
 324                         kind = "branch";
 325                         what = rm->name + 11;
 326                 }
 327                 else if (!prefixcmp(rm->name, "refs/tags/")) {
 328                         kind = "tag";
 329                         what = rm->name + 10;
 330                 }
 331                 else if (!prefixcmp(rm->name, "refs/remotes/")) {
 332                         kind = "remote branch";
 333                         what = rm->name + 13;
 334                 }
 335                 else {
 336                         kind = "";
 337                         what = rm->name;
 338                 }
 339
 340                 url_len = strlen(url);
 341                 for (i = url_len - 1; url[i] == '/' && 0 <= i; i--)
 342                         ;
 343                 url_len = i + 1;
 344                 if (4 < i && !strncmp(".git", url + i - 3, 4))
 345                         url_len = i - 3;
 346
 347                 note_len = 0;
 348                 if (*what) {
 349                         if (*kind)
 350                                 note_len += sprintf(note + note_len, "%s ",
 351                                                     kind);
 352                         note_len += sprintf(note + note_len, "'%s' of ", what);
 353                 }
 354                 note_len += sprintf(note + note_len, "%.*s", url_len, url);
 355                 fprintf(fp, "%s\t%s\t%s\n",
 356                         sha1_to_hex(commit ? commit->object.sha1 :
 357                                     rm->old_sha1),
 358                         rm->merge ? "" : "not-for-merge",
 359                         note);
 360
 361                 if (ref)
 362                         update_local_ref(ref, what, verbose, note);
 363                 else if (verbose)
 364                         sprintf(note, "* %-*s %-*s -> FETCH_HEAD",
 365                                 SUMMARY_WIDTH, *kind ? kind : "branch",
 366                                  REFCOL_WIDTH, *what ? what : "HEAD");
 367                 else
 368                         *note = '\0';
 369                 if (*note) {
 370                         if (!shown_url) {
 371                                 fprintf(stderr, "From %.*s\n",
 372                                                 url_len, url);
 373                                 shown_url = 1;
 374                         }
 375                         fprintf(stderr, " %s\n", note);
 376                 }
 377         }
 378         fclose(fp);
 379         return 0;
 380 }
 381
 382 /*
 383  * We would want to bypass the object transfer altogether if
 384  * everything we are going to fetch already exists and connected
 385  * locally.
 386  *
 387  * The refs we are going to fetch are in to_fetch (nr_heads in
 388  * total).  If running
 389  *
 390  *  $ git-rev-list --objects to_fetch[0] to_fetch[1] ... --not --all
 391  *
 392  * does not error out, that means everything reachable from the
 393  * refs we are going to fetch exists and is connected to some of
 394  * our existing refs.
 395  */
 396 static int quickfetch(struct ref *ref_map)
 397 {
 398         struct child_process revlist;
 399         struct ref *ref;
 400         char **argv;
 401         int i, err;
 402
 403         /*
 404          * If we are deepening a shallow clone we already have these
 405          * objects reachable.  Running rev-list here will return with
 406          * a good (0) exit status and we'll bypass the fetch that we
 407          * really need to perform.  Claiming failure now will ensure
 408          * we perform the network exchange to deepen our history.
 409          */
 410         if (depth)
 411                 return -1;
 412
 413         for (i = 0, ref = ref_map; ref; ref = ref->next)
 414                 i++;
 415         if (!i)
 416                 return 0;
 417
 418         argv = xmalloc(sizeof(*argv) * (i + 6));
 419         i = 0;
 420         argv[i++] = xstrdup("rev-list");
 421         argv[i++] = xstrdup("--quiet");
 422         argv[i++] = xstrdup("--objects");
 423         for (ref = ref_map; ref; ref = ref->next)
 424                 argv[i++] = xstrdup(sha1_to_hex(ref->old_sha1));
 425         argv[i++] = xstrdup("--not");
 426         argv[i++] = xstrdup("--all");
 427         argv[i++] = NULL;
 428
 429         memset(&revlist, 0, sizeof(revlist));
 430         revlist.argv = (const char**)argv;
 431         revlist.git_cmd = 1;
 432         revlist.no_stdin = 1;
 433         revlist.no_stdout = 1;
 434         revlist.no_stderr = 1;
 435         err = run_command(&revlist);
 436
 437         for (i = 0; argv[i]; i++)
 438                 free(argv[i]);
 439         free(argv);
 440         return err;
 441 }
 442
 443 static int fetch_refs(struct transport *transport, struct ref *ref_map)
 444 {
 445         int ret = quickfetch(ref_map);
 446         if (ret)
 447                 ret = transport_fetch_refs(transport, ref_map);
 448         if (!ret)
 449                 ret |= store_updated_refs(transport->url, ref_map);
 450         transport_unlock_pack(transport);
 451         return ret;
 452 }
 453
 454 static int add_existing(const char *refname, const unsigned char *sha1,
 455                         int flag, void *cbdata)
 456 {
 457         struct path_list *list = (struct path_list *)cbdata;
 458         path_list_insert(refname, list);
 459         return 0;
 460 }
 461
 462 static int will_fetch(struct ref **head, const unsigned char *sha1)
 463 {
 464         struct ref *rm = *head;
 465         while (rm) {
 466                 if (!hashcmp(rm->old_sha1, sha1))
 467                         return 1;
 468                 rm = rm->next;
 469         }
 470         return 0;
 471 }
 472
 473 static void find_non_local_tags(struct transport *transport,
 474                         struct ref **head,
 475                         struct ref ***tail)
 476 {
 477         struct path_list existing_refs = { NULL, 0, 0, 0 };
 478         struct path_list new_refs = { NULL, 0, 0, 1 };
 479         char *ref_name;
 480         int ref_name_len;
 481         const unsigned char *ref_sha1;
 482         const struct ref *tag_ref;
 483         struct ref *rm = NULL;
 484         const struct ref *ref;
 485
 486         for_each_ref(add_existing, &existing_refs);
 487         for (ref = transport_get_remote_refs(transport); ref; ref = ref->next) {
 488                 if (prefixcmp(ref->name, "refs/tags"))
 489                         continue;
 490
 491                 ref_name = xstrdup(ref->name);
 492                 ref_name_len = strlen(ref_name);
 493                 ref_sha1 = ref->old_sha1;
 494
 495                 if (!strcmp(ref_name + ref_name_len - 3, "^{}")) {
 496                         ref_name[ref_name_len - 3] = 0;
 497                         tag_ref = transport_get_remote_refs(transport);
 498                         while (tag_ref) {
 499                                 if (!strcmp(tag_ref->name, ref_name)) {
 500                                         ref_sha1 = tag_ref->old_sha1;
 501                                         break;
 502                                 }
 503                                 tag_ref = tag_ref->next;
 504                         }
 505                 }
 506
 507                 if (!path_list_has_path(&existing_refs, ref_name) &&
 508                     !path_list_has_path(&new_refs, ref_name) &&
 509                     (has_sha1_file(ref->old_sha1) ||
 510                      will_fetch(head, ref->old_sha1))) {
 511                         path_list_insert(ref_name, &new_refs);
 512
 513                         rm = alloc_ref(strlen(ref_name) + 1);
 514                         strcpy(rm->name, ref_name);
 515                         rm->peer_ref = alloc_ref(strlen(ref_name) + 1);
 516                         strcpy(rm->peer_ref->name, ref_name);
 517                         hashcpy(rm->old_sha1, ref_sha1);
 518
 519                         **tail = rm;
 520                         *tail = &rm->next;
 521                 }
 522                 free(ref_name);
 523         }
 524         path_list_clear(&existing_refs, 0);
 525         path_list_clear(&new_refs, 0);
 526 }
 527
 528 static int do_fetch(struct transport *transport,
 529                     struct refspec *refs, int ref_count)
 530 {
 531         struct ref *ref_map;
 532         struct ref *rm;
 533         int autotags = (transport->remote->fetch_tags == 1);
 534         if (transport->remote->fetch_tags == 2 && tags != TAGS_UNSET)
 535                 tags = TAGS_SET;
 536         if (transport->remote->fetch_tags == -1)
 537                 tags = TAGS_UNSET;
 538
 539         if (!transport->get_refs_list || !transport->fetch)
 540                 die("Don't know how to fetch from %s", transport->url);
 541
 542         /* if not appending, truncate FETCH_HEAD */
 543         if (!append) {
 544                 char *filename = git_path("FETCH_HEAD");
 545                 FILE *fp = fopen(filename, "w");
 546                 if (!fp)
 547                         return error("cannot open %s: %s\n", filename, strerror(errno));
 548                 fclose(fp);
 549         }
 550
 551         ref_map = get_ref_map(transport, refs, ref_count, tags, &autotags);
 552
 553         for (rm = ref_map; rm; rm = rm->next) {
 554                 if (rm->peer_ref)
 555                         read_ref(rm->peer_ref->name, rm->peer_ref->old_sha1);
 556         }
 557
 558         if (tags == TAGS_DEFAULT && autotags)
 559                 transport_set_option(transport, TRANS_OPT_FOLLOWTAGS, "1");
 560         if (fetch_refs(transport, ref_map)) {
 561                 free_refs(ref_map);
 562                 return 1;
 563         }
 564         free_refs(ref_map);
 565
 566         /* if neither --no-tags nor --tags was specified, do automated tag
 567          * following ... */
 568         if (tags == TAGS_DEFAULT && autotags) {
 569                 struct ref **tail = &ref_map;
 570                 ref_map = NULL;
 571                 find_non_local_tags(transport, &ref_map, &tail);
 572                 if (ref_map) {
 573                         transport_set_option(transport, TRANS_OPT_FOLLOWTAGS, NULL);
 574                         transport_set_option(transport, TRANS_OPT_DEPTH, "0");
 575                         fetch_refs(transport, ref_map);
 576                 }
 577                 free_refs(ref_map);
 578         }
 579
 580         transport_disconnect(transport);
 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
 603         /* Record the command line for the reflog */
 604         strbuf_addstr(&default_rla, "fetch");
 605         for (i = 1; i < argc; i++)
 606                 strbuf_addf(&default_rla, " %s", argv[i]);
 607
 608         argc = parse_options(argc, argv,
 609                              builtin_fetch_options, builtin_fetch_usage, 0);
 610
 611         if (argc == 0)
 612                 remote = remote_get(NULL);
 613         else
 614                 remote = remote_get(argv[0]);
 615
 616         transport = transport_get(remote, remote->url[0]);
 617         if (verbose >= 2)
 618                 transport->verbose = 1;
 619         if (quiet)
 620                 transport->verbose = -1;
 621         if (upload_pack)
 622                 set_option(TRANS_OPT_UPLOADPACK, upload_pack);
 623         if (keep)
 624                 set_option(TRANS_OPT_KEEP, "yes");
 625         if (depth)
 626                 set_option(TRANS_OPT_DEPTH, depth);
 627
 628         if (!transport->url)
 629                 die("Where do you want to fetch from today?");
 630
 631         if (argc > 1) {
 632                 int j = 0;
 633                 refs = xcalloc(argc + 1, sizeof(const char *));
 634                 for (i = 1; i < argc; i++) {
 635                         if (!strcmp(argv[i], "tag")) {
 636                                 char *ref;
 637                                 i++;
 638                                 if (i >= argc)
 639                                         die("You need to specify a tag name.");
 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                 }
 649                 refs[j] = NULL;
 650                 ref_nr = j;
 651         }
 652
 653         signal(SIGINT, unlock_pack_on_signal);
 654         atexit(unlock_pack);
 655         return do_fetch(transport,
 656                         parse_fetch_refspec(ref_nr, refs), ref_nr);
 657 }