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
  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, verbosity;
  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__VERBOSITY(&verbosity),
  34         OPT_BOOLEAN('a', "append", &append,
  35                     "append to .git/FETCH_HEAD instead of overwriting"),
  36         OPT_STRING(0, "upload-pack", &upload_pack, "PATH",
  37                    "path to upload pack on remote end"),
  38         OPT_BOOLEAN('f', "force", &force,
  39                     "force overwrite of local branch"),
  40         OPT_SET_INT('t', "tags", &tags,
  41                     "fetch all tags and associated objects", TAGS_SET),
  42         OPT_SET_INT('n', NULL, &tags,
  43                     "do not fetch all tags (--no-tags)", TAGS_UNSET),
  44         OPT_BOOLEAN('k', "keep", &keep, "keep downloaded pack"),
  45         OPT_BOOLEAN('u', "update-head-ok", &update_head_ok,
  46                     "allow updating of HEAD ref"),
  47         OPT_STRING(0, "depth", &depth, "DEPTH",
  48                    "deepen history of shallow clone"),
  49         OPT_END()
  50 };
  51
  52 static void unlock_pack(void)
  53 {
  54         if (transport)
  55                 transport_unlock_pack(transport);
  56 }
  57
  58 static void unlock_pack_on_signal(int signo)
  59 {
  60         unlock_pack();
  61         signal(SIGINT, SIG_DFL);
  62         raise(signo);
  63 }
  64
  65 static void add_merge_config(struct ref **head,
  66                            const struct ref *remote_refs,
  67                            struct branch *branch,
  68                            struct ref ***tail)
  69 {
  70         int i;
  71
  72         for (i = 0; i < branch->merge_nr; i++) {
  73                 struct ref *rm, **old_tail = *tail;
  74                 struct refspec refspec;
  75
  76                 for (rm = *head; rm; rm = rm->next) {
  77                         if (branch_merge_matches(branch, i, rm->name)) {
  78                                 rm->merge = 1;
  79                                 break;
  80                         }
  81                 }
  82                 if (rm)
  83                         continue;
  84
  85                 /*
  86                  * Not fetched to a tracking branch?  We need to fetch
  87                  * it anyway to allow this branch's "branch.$name.merge"
  88                  * to be honored by 'git pull', but we do not have to
  89                  * fail if branch.$name.merge is misconfigured to point
  90                  * at a nonexisting branch.  If we were indeed called by
  91                  * 'git pull', it will notice the misconfiguration because
  92                  * there is no entry in the resulting FETCH_HEAD marked
  93                  * for merging.
  94                  */
  95                 refspec.src = branch->merge[i]->src;
  96                 refspec.dst = NULL;
  97                 refspec.pattern = 0;
  98                 refspec.force = 0;
  99                 get_fetch_map(remote_refs, &refspec, tail, 1);
 100                 for (rm = *old_tail; rm; rm = rm->next)
 101                         rm->merge = 1;
 102         }
 103 }
 104
 105 static void find_non_local_tags(struct transport *transport,
 106                         struct ref **head,
 107                         struct ref ***tail);
 108
 109 static struct ref *get_ref_map(struct transport *transport,
 110                                struct refspec *refs, int ref_count, int tags,
 111                                int *autotags)
 112 {
 113         int i;
 114         struct ref *rm;
 115         struct ref *ref_map = NULL;
 116         struct ref **tail = &ref_map;
 117
 118         const struct ref *remote_refs = transport_get_remote_refs(transport);
 119
 120         if (ref_count || tags == TAGS_SET) {
 121                 for (i = 0; i < ref_count; i++) {
 122                         get_fetch_map(remote_refs, &refs[i], &tail, 0);
 123                         if (refs[i].dst && refs[i].dst[0])
 124                                 *autotags = 1;
 125                 }
 126                 /* Merge everything on the command line, but not --tags */
 127                 for (rm = ref_map; rm; rm = rm->next)
 128                         rm->merge = 1;
 129                 if (tags == TAGS_SET)
 130                         get_fetch_map(remote_refs, tag_refspec, &tail, 0);
 131         } else {
 132                 /* Use the defaults */
 133                 struct remote *remote = transport->remote;
 134                 struct branch *branch = branch_get(NULL);
 135                 int has_merge = branch_has_merge_config(branch);
 136                 if (remote && (remote->fetch_refspec_nr || has_merge)) {
 137                         for (i = 0; i < remote->fetch_refspec_nr; i++) {
 138                                 get_fetch_map(remote_refs, &remote->fetch[i], &tail, 0);
 139                                 if (remote->fetch[i].dst &&
 140                                     remote->fetch[i].dst[0])
 141                                         *autotags = 1;
 142                                 if (!i && !has_merge && ref_map &&
 143                                     !remote->fetch[0].pattern)
 144                                         ref_map->merge = 1;
 145                         }
 146                         /*
 147                          * if the remote we're fetching from is the same
 148                          * as given in branch.<name>.remote, we add the
 149                          * ref given in branch.<name>.merge, too.
 150                          */
 151                         if (has_merge &&
 152                             !strcmp(branch->remote_name, remote->name))
 153                                 add_merge_config(&ref_map, remote_refs, branch, &tail);
 154                 } else {
 155                         ref_map = get_remote_ref(remote_refs, "HEAD");
 156                         if (!ref_map)
 157                                 die("Couldn't find remote ref HEAD");
 158                         ref_map->merge = 1;
 159                         tail = &ref_map->next;
 160                 }
 161         }
 162         if (tags == TAGS_DEFAULT && *autotags)
 163                 find_non_local_tags(transport, &ref_map, &tail);
 164         ref_remove_duplicates(ref_map);
 165
 166         return ref_map;
 167 }
 168
 169 static int s_update_ref(const char *action,
 170                         struct ref *ref,
 171                         int check_old)
 172 {
 173         char msg[1024];
 174         char *rla = getenv("GIT_REFLOG_ACTION");
 175         static struct ref_lock *lock;
 176
 177         if (!rla)
 178                 rla = default_rla.buf;
 179         snprintf(msg, sizeof(msg), "%s: %s", rla, action);
 180         lock = lock_any_ref_for_update(ref->name,
 181                                        check_old ? ref->old_sha1 : NULL, 0);
 182         if (!lock)
 183                 return 2;
 184         if (write_ref_sha1(lock, ref->new_sha1, msg) < 0)
 185                 return 2;
 186         return 0;
 187 }
 188
 189 #define SUMMARY_WIDTH (2 * DEFAULT_ABBREV + 3)
 190 #define REFCOL_WIDTH  10
 191
 192 static int update_local_ref(struct ref *ref,
 193                             const char *remote,
 194                             char *display)
 195 {
 196         struct commit *current = NULL, *updated;
 197         enum object_type type;
 198         struct branch *current_branch = branch_get(NULL);
 199         const char *pretty_ref = ref->name + (
 200                 !prefixcmp(ref->name, "refs/heads/") ? 11 :
 201                 !prefixcmp(ref->name, "refs/tags/") ? 10 :
 202                 !prefixcmp(ref->name, "refs/remotes/") ? 13 :
 203                 0);
 204
 205         *display = 0;
 206         type = sha1_object_info(ref->new_sha1, NULL);
 207         if (type < 0)
 208                 die("object %s not found", sha1_to_hex(ref->new_sha1));
 209
 210         if (!hashcmp(ref->old_sha1, ref->new_sha1)) {
 211                 if (verbosity > 0)
 212                         sprintf(display, "= %-*s %-*s -> %s", SUMMARY_WIDTH,
 213                                 "[up to date]", REFCOL_WIDTH, remote,
 214                                 pretty_ref);
 215                 return 0;
 216         }
 217
 218         if (current_branch &&
 219             !strcmp(ref->name, current_branch->name) &&
 220             !(update_head_ok || is_bare_repository()) &&
 221             !is_null_sha1(ref->old_sha1)) {
 222                 /*
 223                  * If this is the head, and it's not okay to update
 224                  * the head, and the old value of the head isn't empty...
 225                  */
 226                 sprintf(display, "! %-*s %-*s -> %s  (can't fetch in current branch)",
 227                         SUMMARY_WIDTH, "[rejected]", REFCOL_WIDTH, remote,
 228                         pretty_ref);
 229                 return 1;
 230         }
 231
 232         if (!is_null_sha1(ref->old_sha1) &&
 233             !prefixcmp(ref->name, "refs/tags/")) {
 234                 int r;
 235                 r = s_update_ref("updating tag", ref, 0);
 236                 sprintf(display, "%c %-*s %-*s -> %s%s", r ? '!' : '-',
 237                         SUMMARY_WIDTH, "[tag update]", REFCOL_WIDTH, remote,
 238                         pretty_ref, r ? "  (unable to update local ref)" : "");
 239                 return r;
 240         }
 241
 242         current = lookup_commit_reference_gently(ref->old_sha1, 1);
 243         updated = lookup_commit_reference_gently(ref->new_sha1, 1);
 244         if (!current || !updated) {
 245                 const char *msg;
 246                 const char *what;
 247                 int r;
 248                 if (!strncmp(ref->name, "refs/tags/", 10)) {
 249                         msg = "storing tag";
 250                         what = "[new tag]";
 251                 }
 252                 else {
 253                         msg = "storing head";
 254                         what = "[new branch]";
 255                 }
 256
 257                 r = s_update_ref(msg, ref, 0);
 258                 sprintf(display, "%c %-*s %-*s -> %s%s", r ? '!' : '*',
 259                         SUMMARY_WIDTH, what, REFCOL_WIDTH, remote, pretty_ref,
 260                         r ? "  (unable to update local ref)" : "");
 261                 return r;
 262         }
 263
 264         if (in_merge_bases(current, &updated, 1)) {
 265                 char quickref[83];
 266                 int r;
 267                 strcpy(quickref, find_unique_abbrev(current->object.sha1, DEFAULT_ABBREV));
 268                 strcat(quickref, "..");
 269                 strcat(quickref, find_unique_abbrev(ref->new_sha1, DEFAULT_ABBREV));
 270                 r = s_update_ref("fast forward", ref, 1);
 271                 sprintf(display, "%c %-*s %-*s -> %s%s", r ? '!' : ' ',
 272                         SUMMARY_WIDTH, quickref, REFCOL_WIDTH, remote,
 273                         pretty_ref, r ? "  (unable to update local ref)" : "");
 274                 return r;
 275         } else if (force || ref->force) {
 276                 char quickref[84];
 277                 int r;
 278                 strcpy(quickref, find_unique_abbrev(current->object.sha1, DEFAULT_ABBREV));
 279                 strcat(quickref, "...");
 280                 strcat(quickref, find_unique_abbrev(ref->new_sha1, DEFAULT_ABBREV));
 281                 r = s_update_ref("forced-update", ref, 1);
 282                 sprintf(display, "%c %-*s %-*s -> %s  (%s)", r ? '!' : '+',
 283                         SUMMARY_WIDTH, quickref, REFCOL_WIDTH, remote,
 284                         pretty_ref,
 285                         r ? "unable to update local ref" : "forced update");
 286                 return r;
 287         } else {
 288                 sprintf(display, "! %-*s %-*s -> %s  (non fast forward)",
 289                         SUMMARY_WIDTH, "[rejected]", REFCOL_WIDTH, remote,
 290                         pretty_ref);
 291                 return 1;
 292         }
 293 }
 294
 295 static int store_updated_refs(const char *url, const char *remote_name,
 296                 struct ref *ref_map)
 297 {
 298         FILE *fp;
 299         struct commit *commit;
 300         int url_len, i, note_len, shown_url = 0, rc = 0;
 301         char note[1024];
 302         const char *what, *kind;
 303         struct ref *rm;
 304         char *filename = git_path("FETCH_HEAD");
 305
 306         fp = fopen(filename, "a");
 307         if (!fp)
 308                 return error("cannot open %s: %s\n", filename, strerror(errno));
 309         for (rm = ref_map; rm; rm = rm->next) {
 310                 struct ref *ref = NULL;
 311
 312                 if (rm->peer_ref) {
 313                         ref = xcalloc(1, sizeof(*ref) + strlen(rm->peer_ref->name) + 1);
 314                         strcpy(ref->name, rm->peer_ref->name);
 315                         hashcpy(ref->old_sha1, rm->peer_ref->old_sha1);
 316                         hashcpy(ref->new_sha1, rm->old_sha1);
 317                         ref->force = rm->peer_ref->force;
 318                 }
 319
 320                 commit = lookup_commit_reference_gently(rm->old_sha1, 1);
 321                 if (!commit)
 322                         rm->merge = 0;
 323
 324                 if (!strcmp(rm->name, "HEAD")) {
 325                         kind = "";
 326                         what = "";
 327                 }
 328                 else if (!prefixcmp(rm->name, "refs/heads/")) {
 329                         kind = "branch";
 330                         what = rm->name + 11;
 331                 }
 332                 else if (!prefixcmp(rm->name, "refs/tags/")) {
 333                         kind = "tag";
 334                         what = rm->name + 10;
 335                 }
 336                 else if (!prefixcmp(rm->name, "refs/remotes/")) {
 337                         kind = "remote branch";
 338                         what = rm->name + 13;
 339                 }
 340                 else {
 341                         kind = "";
 342                         what = rm->name;
 343                 }
 344
 345                 url_len = strlen(url);
 346                 for (i = url_len - 1; url[i] == '/' && 0 <= i; i--)
 347                         ;
 348                 url_len = i + 1;
 349                 if (4 < i && !strncmp(".git", url + i - 3, 4))
 350                         url_len = i - 3;
 351
 352                 note_len = 0;
 353                 if (*what) {
 354                         if (*kind)
 355                                 note_len += sprintf(note + note_len, "%s ",
 356                                                     kind);
 357                         note_len += sprintf(note + note_len, "'%s' of ", what);
 358                 }
 359                 note_len += sprintf(note + note_len, "%.*s", url_len, url);
 360                 fprintf(fp, "%s\t%s\t%s\n",
 361                         sha1_to_hex(commit ? commit->object.sha1 :
 362                                     rm->old_sha1),
 363                         rm->merge ? "" : "not-for-merge",
 364                         note);
 365
 366                 if (ref)
 367                         rc |= update_local_ref(ref, what, note);
 368                 else
 369                         sprintf(note, "* %-*s %-*s -> FETCH_HEAD",
 370                                 SUMMARY_WIDTH, *kind ? kind : "branch",
 371                                  REFCOL_WIDTH, *what ? what : "HEAD");
 372                 if (*note) {
 373                         if (verbosity >= 0 && !shown_url) {
 374                                 fprintf(stderr, "From %.*s\n",
 375                                                 url_len, url);
 376                                 shown_url = 1;
 377                         }
 378                         if (verbosity >= 0)
 379                                 fprintf(stderr, " %s\n", note);
 380                 }
 381         }
 382         fclose(fp);
 383         if (rc & 2)
 384                 error("some local refs could not be updated; try running\n"
 385                       " 'git remote prune %s' to remove any old, conflicting "
 386                       "branches", remote_name);
 387         return rc;
 388 }
 389
 390 /*
 391  * We would want to bypass the object transfer altogether if
 392  * everything we are going to fetch already exists and connected
 393  * locally.
 394  *
 395  * The refs we are going to fetch are in to_fetch (nr_heads in
 396  * total).  If running
 397  *
 398  *  $ git rev-list --objects to_fetch[0] to_fetch[1] ... --not --all
 399  *
 400  * does not error out, that means everything reachable from the
 401  * refs we are going to fetch exists and is connected to some of
 402  * our existing refs.
 403  */
 404 static int quickfetch(struct ref *ref_map)
 405 {
 406         struct child_process revlist;
 407         struct ref *ref;
 408         char **argv;
 409         int i, err;
 410
 411         /*
 412          * If we are deepening a shallow clone we already have these
 413          * objects reachable.  Running rev-list here will return with
 414          * a good (0) exit status and we'll bypass the fetch that we
 415          * really need to perform.  Claiming failure now will ensure
 416          * we perform the network exchange to deepen our history.
 417          */
 418         if (depth)
 419                 return -1;
 420
 421         for (i = 0, ref = ref_map; ref; ref = ref->next)
 422                 i++;
 423         if (!i)
 424                 return 0;
 425
 426         argv = xmalloc(sizeof(*argv) * (i + 6));
 427         i = 0;
 428         argv[i++] = xstrdup("rev-list");
 429         argv[i++] = xstrdup("--quiet");
 430         argv[i++] = xstrdup("--objects");
 431         for (ref = ref_map; ref; ref = ref->next)
 432                 argv[i++] = xstrdup(sha1_to_hex(ref->old_sha1));
 433         argv[i++] = xstrdup("--not");
 434         argv[i++] = xstrdup("--all");
 435         argv[i++] = NULL;
 436
 437         memset(&revlist, 0, sizeof(revlist));
 438         revlist.argv = (const char**)argv;
 439         revlist.git_cmd = 1;
 440         revlist.no_stdin = 1;
 441         revlist.no_stdout = 1;
 442         revlist.no_stderr = 1;
 443         err = run_command(&revlist);
 444
 445         for (i = 0; argv[i]; i++)
 446                 free(argv[i]);
 447         free(argv);
 448         return err;
 449 }
 450
 451 static int fetch_refs(struct transport *transport, struct ref *ref_map)
 452 {
 453         int ret = quickfetch(ref_map);
 454         if (ret)
 455                 ret = transport_fetch_refs(transport, ref_map);
 456         if (!ret)
 457                 ret |= store_updated_refs(transport->url,
 458                                 transport->remote->name,
 459                                 ref_map);
 460         transport_unlock_pack(transport);
 461         return ret;
 462 }
 463
 464 static int add_existing(const char *refname, const unsigned char *sha1,
 465                         int flag, void *cbdata)
 466 {
 467         struct string_list *list = (struct string_list *)cbdata;
 468         string_list_insert(refname, list);
 469         return 0;
 470 }
 471
 472 static int will_fetch(struct ref **head, const unsigned char *sha1)
 473 {
 474         struct ref *rm = *head;
 475         while (rm) {
 476                 if (!hashcmp(rm->old_sha1, sha1))
 477                         return 1;
 478                 rm = rm->next;
 479         }
 480         return 0;
 481 }
 482
 483 static void find_non_local_tags(struct transport *transport,
 484                         struct ref **head,
 485                         struct ref ***tail)
 486 {
 487         struct string_list existing_refs = { NULL, 0, 0, 0 };
 488         struct string_list new_refs = { NULL, 0, 0, 1 };
 489         char *ref_name;
 490         int ref_name_len;
 491         const unsigned char *ref_sha1;
 492         const struct ref *tag_ref;
 493         struct ref *rm = NULL;
 494         const struct ref *ref;
 495
 496         for_each_ref(add_existing, &existing_refs);
 497         for (ref = transport_get_remote_refs(transport); ref; ref = ref->next) {
 498                 if (prefixcmp(ref->name, "refs/tags"))
 499                         continue;
 500
 501                 ref_name = xstrdup(ref->name);
 502                 ref_name_len = strlen(ref_name);
 503                 ref_sha1 = ref->old_sha1;
 504
 505                 if (!strcmp(ref_name + ref_name_len - 3, "^{}")) {
 506                         ref_name[ref_name_len - 3] = 0;
 507                         tag_ref = transport_get_remote_refs(transport);
 508                         while (tag_ref) {
 509                                 if (!strcmp(tag_ref->name, ref_name)) {
 510                                         ref_sha1 = tag_ref->old_sha1;
 511                                         break;
 512                                 }
 513                                 tag_ref = tag_ref->next;
 514                         }
 515                 }
 516
 517                 if (!string_list_has_string(&existing_refs, ref_name) &&
 518                     !string_list_has_string(&new_refs, ref_name) &&
 519                     (has_sha1_file(ref->old_sha1) ||
 520                      will_fetch(head, ref->old_sha1))) {
 521                         string_list_insert(ref_name, &new_refs);
 522
 523                         rm = alloc_ref(ref_name);
 524                         rm->peer_ref = alloc_ref(ref_name);
 525                         hashcpy(rm->old_sha1, ref_sha1);
 526
 527                         **tail = rm;
 528                         *tail = &rm->next;
 529                 }
 530                 free(ref_name);
 531         }
 532         string_list_clear(&existing_refs, 0);
 533         string_list_clear(&new_refs, 0);
 534 }
 535
 536 static void check_not_current_branch(struct ref *ref_map)
 537 {
 538         struct branch *current_branch = branch_get(NULL);
 539
 540         if (is_bare_repository() || !current_branch)
 541                 return;
 542
 543         for (; ref_map; ref_map = ref_map->next)
 544                 if (ref_map->peer_ref && !strcmp(current_branch->refname,
 545                                         ref_map->peer_ref->name))
 546                         die("Refusing to fetch into current branch");
 547 }
 548
 549 static int do_fetch(struct transport *transport,
 550                     struct refspec *refs, int ref_count)
 551 {
 552         struct ref *ref_map;
 553         struct ref *rm;
 554         int autotags = (transport->remote->fetch_tags == 1);
 555         if (transport->remote->fetch_tags == 2 && tags != TAGS_UNSET)
 556                 tags = TAGS_SET;
 557         if (transport->remote->fetch_tags == -1)
 558                 tags = TAGS_UNSET;
 559
 560         if (!transport->get_refs_list || !transport->fetch)
 561                 die("Don't know how to fetch from %s", transport->url);
 562
 563         /* if not appending, truncate FETCH_HEAD */
 564         if (!append) {
 565                 char *filename = git_path("FETCH_HEAD");
 566                 FILE *fp = fopen(filename, "w");
 567                 if (!fp)
 568                         return error("cannot open %s: %s\n", filename, strerror(errno));
 569                 fclose(fp);
 570         }
 571
 572         ref_map = get_ref_map(transport, refs, ref_count, tags, &autotags);
 573         if (!update_head_ok)
 574                 check_not_current_branch(ref_map);
 575
 576         for (rm = ref_map; rm; rm = rm->next) {
 577                 if (rm->peer_ref)
 578                         read_ref(rm->peer_ref->name, rm->peer_ref->old_sha1);
 579         }
 580
 581         if (tags == TAGS_DEFAULT && autotags)
 582                 transport_set_option(transport, TRANS_OPT_FOLLOWTAGS, "1");
 583         if (fetch_refs(transport, ref_map)) {
 584                 free_refs(ref_map);
 585                 return 1;
 586         }
 587         free_refs(ref_map);
 588
 589         /* if neither --no-tags nor --tags was specified, do automated tag
 590          * following ... */
 591         if (tags == TAGS_DEFAULT && autotags) {
 592                 struct ref **tail = &ref_map;
 593                 ref_map = NULL;
 594                 find_non_local_tags(transport, &ref_map, &tail);
 595                 if (ref_map) {
 596                         transport_set_option(transport, TRANS_OPT_FOLLOWTAGS, NULL);
 597                         transport_set_option(transport, TRANS_OPT_DEPTH, "0");
 598                         fetch_refs(transport, ref_map);
 599                 }
 600                 free_refs(ref_map);
 601         }
 602
 603         return 0;
 604 }
 605
 606 static void set_option(const char *name, const char *value)
 607 {
 608         int r = transport_set_option(transport, name, value);
 609         if (r < 0)
 610                 die("Option \"%s\" value \"%s\" is not valid for %s\n",
 611                         name, value, transport->url);
 612         if (r > 0)
 613                 warning("Option \"%s\" is ignored for %s\n",
 614                         name, transport->url);
 615 }
 616
 617 int cmd_fetch(int argc, const char **argv, const char *prefix)
 618 {
 619         struct remote *remote;
 620         int i;
 621         static const char **refs = NULL;
 622         int ref_nr = 0;
 623         int exit_code;
 624
 625         /* Record the command line for the reflog */
 626         strbuf_addstr(&default_rla, "fetch");
 627         for (i = 1; i < argc; i++)
 628                 strbuf_addf(&default_rla, " %s", argv[i]);
 629
 630         argc = parse_options(argc, argv,
 631                              builtin_fetch_options, builtin_fetch_usage, 0);
 632
 633         if (argc == 0)
 634                 remote = remote_get(NULL);
 635         else
 636                 remote = remote_get(argv[0]);
 637
 638         transport = transport_get(remote, remote->url[0]);
 639         if (verbosity >= 2)
 640                 transport->verbose = 1;
 641         if (verbosity < 0)
 642                 transport->verbose = -1;
 643         if (upload_pack)
 644                 set_option(TRANS_OPT_UPLOADPACK, upload_pack);
 645         if (keep)
 646                 set_option(TRANS_OPT_KEEP, "yes");
 647         if (depth)
 648                 set_option(TRANS_OPT_DEPTH, depth);
 649
 650         if (!transport->url)
 651                 die("Where do you want to fetch from today?");
 652
 653         if (argc > 1) {
 654                 int j = 0;
 655                 refs = xcalloc(argc + 1, sizeof(const char *));
 656                 for (i = 1; i < argc; i++) {
 657                         if (!strcmp(argv[i], "tag")) {
 658                                 char *ref;
 659                                 i++;
 660                                 if (i >= argc)
 661                                         die("You need to specify a tag name.");
 662                                 ref = xmalloc(strlen(argv[i]) * 2 + 22);
 663                                 strcpy(ref, "refs/tags/");
 664                                 strcat(ref, argv[i]);
 665                                 strcat(ref, ":refs/tags/");
 666                                 strcat(ref, argv[i]);
 667                                 refs[j++] = ref;
 668                         } else
 669                                 refs[j++] = argv[i];
 670                 }
 671                 refs[j] = NULL;
 672                 ref_nr = j;
 673         }
 674
 675         signal(SIGINT, unlock_pack_on_signal);
 676         atexit(unlock_pack);
 677         exit_code = do_fetch(transport,
 678                         parse_fetch_refspec(ref_nr, refs), ref_nr);
 679         transport_disconnect(transport);
 680         transport = NULL;
 681         return exit_code;
 682 }