builtin-fetch.c

   1 /*
   2  * "git fetch"
   3  */
   4 #include "cache.h"
   5 #include "refs.h"
   6 #include "commit.h"
   7 #include "builtin.h"
   8 #include "string-list.h"
   9 #include "remote.h"
  10 #include "transport.h"
  11 #include "run-command.h"
  12 #include "parse-options.h"
  13 #include "sigchain.h"
  14
  15 static const char * const builtin_fetch_usage[] = {
  16         "git fetch [options] [<repository> <refspec>...]",
  17         NULL
  18 };
  19
  20 enum {
  21         TAGS_UNSET = 0,
  22         TAGS_DEFAULT = 1,
  23         TAGS_SET = 2
  24 };
  25
  26 static int append, force, keep, update_head_ok, verbosity;
  27 static int tags = TAGS_DEFAULT;
  28 static const char *depth;
  29 static const char *upload_pack;
  30 static struct strbuf default_rla = STRBUF_INIT;
  31 static struct transport *transport;
  32
  33 static struct option builtin_fetch_options[] = {
  34         OPT__VERBOSITY(&verbosity),
  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         sigchain_pop(signo);
  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 #define STORE_REF_ERROR_OTHER 1
 171 #define STORE_REF_ERROR_DF_CONFLICT 2
 172
 173 static int s_update_ref(const char *action,
 174                         struct ref *ref,
 175                         int check_old)
 176 {
 177         char msg[1024];
 178         char *rla = getenv("GIT_REFLOG_ACTION");
 179         static struct ref_lock *lock;
 180
 181         if (!rla)
 182                 rla = default_rla.buf;
 183         snprintf(msg, sizeof(msg), "%s: %s", rla, action);
 184         lock = lock_any_ref_for_update(ref->name,
 185                                        check_old ? ref->old_sha1 : NULL, 0);
 186         if (!lock)
 187                 return errno == ENOTDIR ? STORE_REF_ERROR_DF_CONFLICT :
 188                                           STORE_REF_ERROR_OTHER;
 189         if (write_ref_sha1(lock, ref->new_sha1, msg) < 0)
 190                 return errno == ENOTDIR ? STORE_REF_ERROR_DF_CONFLICT :
 191                                           STORE_REF_ERROR_OTHER;
 192         return 0;
 193 }
 194
 195 #define SUMMARY_WIDTH (2 * DEFAULT_ABBREV + 3)
 196 #define REFCOL_WIDTH  10
 197
 198 static int update_local_ref(struct ref *ref,
 199                             const char *remote,
 200                             char *display)
 201 {
 202         struct commit *current = NULL, *updated;
 203         enum object_type type;
 204         struct branch *current_branch = branch_get(NULL);
 205         const char *pretty_ref = prettify_refname(ref->name);
 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 (verbosity > 0)
 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 *raw_url, const char *remote_name,
 298                 struct ref *ref_map)
 299 {
 300         FILE *fp;
 301         struct commit *commit;
 302         int url_len, i, note_len, shown_url = 0, rc = 0;
 303         char note[1024];
 304         const char *what, *kind;
 305         struct ref *rm;
 306         char *url, *filename = git_path("FETCH_HEAD");
 307
 308         fp = fopen(filename, "a");
 309         if (!fp)
 310                 return error("cannot open %s: %s\n", filename, strerror(errno));
 311
 312         if (raw_url)
 313                 url = transport_anonymize_url(raw_url);
 314         else
 315                 url = xstrdup("foreign");
 316         for (rm = ref_map; rm; rm = rm->next) {
 317                 struct ref *ref = NULL;
 318
 319                 if (rm->peer_ref) {
 320                         ref = xcalloc(1, sizeof(*ref) + strlen(rm->peer_ref->name) + 1);
 321                         strcpy(ref->name, rm->peer_ref->name);
 322                         hashcpy(ref->old_sha1, rm->peer_ref->old_sha1);
 323                         hashcpy(ref->new_sha1, rm->old_sha1);
 324                         ref->force = rm->peer_ref->force;
 325                 }
 326
 327                 commit = lookup_commit_reference_gently(rm->old_sha1, 1);
 328                 if (!commit)
 329                         rm->merge = 0;
 330
 331                 if (!strcmp(rm->name, "HEAD")) {
 332                         kind = "";
 333                         what = "";
 334                 }
 335                 else if (!prefixcmp(rm->name, "refs/heads/")) {
 336                         kind = "branch";
 337                         what = rm->name + 11;
 338                 }
 339                 else if (!prefixcmp(rm->name, "refs/tags/")) {
 340                         kind = "tag";
 341                         what = rm->name + 10;
 342                 }
 343                 else if (!prefixcmp(rm->name, "refs/remotes/")) {
 344                         kind = "remote branch";
 345                         what = rm->name + 13;
 346                 }
 347                 else {
 348                         kind = "";
 349                         what = rm->name;
 350                 }
 351
 352                 url_len = strlen(url);
 353                 for (i = url_len - 1; url[i] == '/' && 0 <= i; i--)
 354                         ;
 355                 url_len = i + 1;
 356                 if (4 < i && !strncmp(".git", url + i - 3, 4))
 357                         url_len = i - 3;
 358
 359                 note_len = 0;
 360                 if (*what) {
 361                         if (*kind)
 362                                 note_len += sprintf(note + note_len, "%s ",
 363                                                     kind);
 364                         note_len += sprintf(note + note_len, "'%s' of ", what);
 365                 }
 366                 note[note_len] = '\0';
 367                 fprintf(fp, "%s\t%s\t%s",
 368                         sha1_to_hex(commit ? commit->object.sha1 :
 369                                     rm->old_sha1),
 370                         rm->merge ? "" : "not-for-merge",
 371                         note);
 372                 for (i = 0; i < url_len; ++i)
 373                         if ('\n' == url[i])
 374                                 fputs("\\n", fp);
 375                         else
 376                                 fputc(url[i], fp);
 377                 fputc('\n', fp);
 378
 379                 if (ref)
 380                         rc |= update_local_ref(ref, what, note);
 381                 else
 382                         sprintf(note, "* %-*s %-*s -> FETCH_HEAD",
 383                                 SUMMARY_WIDTH, *kind ? kind : "branch",
 384                                  REFCOL_WIDTH, *what ? what : "HEAD");
 385                 if (*note) {
 386                         if (verbosity >= 0 && !shown_url) {
 387                                 fprintf(stderr, "From %.*s\n",
 388                                                 url_len, url);
 389                                 shown_url = 1;
 390                         }
 391                         if (verbosity >= 0)
 392                                 fprintf(stderr, " %s\n", note);
 393                 }
 394         }
 395         free(url);
 396         fclose(fp);
 397         if (rc & STORE_REF_ERROR_DF_CONFLICT)
 398                 error("some local refs could not be updated; try running\n"
 399                       " 'git remote prune %s' to remove any old, conflicting "
 400                       "branches", remote_name);
 401         return rc;
 402 }
 403
 404 /*
 405  * We would want to bypass the object transfer altogether if
 406  * everything we are going to fetch already exists and is connected
 407  * locally.
 408  *
 409  * The refs we are going to fetch are in ref_map.  If running
 410  *
 411  *  $ git rev-list --objects --stdin --not --all
 412  *
 413  * (feeding all the refs in ref_map on its standard input)
 414  * does not error out, that means everything reachable from the
 415  * refs we are going to fetch exists and is connected to some of
 416  * our existing refs.
 417  */
 418 static int quickfetch(struct ref *ref_map)
 419 {
 420         struct child_process revlist;
 421         struct ref *ref;
 422         int err;
 423         const char *argv[] = {"rev-list",
 424                 "--quiet", "--objects", "--stdin", "--not", "--all", NULL};
 425
 426         /*
 427          * If we are deepening a shallow clone we already have these
 428          * objects reachable.  Running rev-list here will return with
 429          * a good (0) exit status and we'll bypass the fetch that we
 430          * really need to perform.  Claiming failure now will ensure
 431          * we perform the network exchange to deepen our history.
 432          */
 433         if (depth)
 434                 return -1;
 435
 436         if (!ref_map)
 437                 return 0;
 438
 439         memset(&revlist, 0, sizeof(revlist));
 440         revlist.argv = argv;
 441         revlist.git_cmd = 1;
 442         revlist.no_stdout = 1;
 443         revlist.no_stderr = 1;
 444         revlist.in = -1;
 445
 446         err = start_command(&revlist);
 447         if (err) {
 448                 error("could not run rev-list");
 449                 return err;
 450         }
 451
 452         /*
 453          * If rev-list --stdin encounters an unknown commit, it terminates,
 454          * which will cause SIGPIPE in the write loop below.
 455          */
 456         sigchain_push(SIGPIPE, SIG_IGN);
 457
 458         for (ref = ref_map; ref; ref = ref->next) {
 459                 if (write_in_full(revlist.in, sha1_to_hex(ref->old_sha1), 40) < 0 ||
 460                     write_str_in_full(revlist.in, "\n") < 0) {
 461                         if (errno != EPIPE && errno != EINVAL)
 462                                 error("failed write to rev-list: %s", strerror(errno));
 463                         err = -1;
 464                         break;
 465                 }
 466         }
 467
 468         if (close(revlist.in)) {
 469                 error("failed to close rev-list's stdin: %s", strerror(errno));
 470                 err = -1;
 471         }
 472
 473         sigchain_pop(SIGPIPE);
 474
 475         return finish_command(&revlist) || err;
 476 }
 477
 478 static int fetch_refs(struct transport *transport, struct ref *ref_map)
 479 {
 480         int ret = quickfetch(ref_map);
 481         if (ret)
 482                 ret = transport_fetch_refs(transport, ref_map);
 483         if (!ret)
 484                 ret |= store_updated_refs(transport->url,
 485                                 transport->remote->name,
 486                                 ref_map);
 487         transport_unlock_pack(transport);
 488         return ret;
 489 }
 490
 491 static int add_existing(const char *refname, const unsigned char *sha1,
 492                         int flag, void *cbdata)
 493 {
 494         struct string_list *list = (struct string_list *)cbdata;
 495         string_list_insert(refname, list);
 496         return 0;
 497 }
 498
 499 static int will_fetch(struct ref **head, const unsigned char *sha1)
 500 {
 501         struct ref *rm = *head;
 502         while (rm) {
 503                 if (!hashcmp(rm->old_sha1, sha1))
 504                         return 1;
 505                 rm = rm->next;
 506         }
 507         return 0;
 508 }
 509
 510 struct tag_data {
 511         struct ref **head;
 512         struct ref ***tail;
 513 };
 514
 515 static int add_to_tail(struct string_list_item *item, void *cb_data)
 516 {
 517         struct tag_data *data = (struct tag_data *)cb_data;
 518         struct ref *rm = NULL;
 519
 520         /* We have already decided to ignore this item */
 521         if (!item->util)
 522                 return 0;
 523
 524         rm = alloc_ref(item->string);
 525         rm->peer_ref = alloc_ref(item->string);
 526         hashcpy(rm->old_sha1, item->util);
 527
 528         **data->tail = rm;
 529         *data->tail = &rm->next;
 530
 531         return 0;
 532 }
 533
 534 static void find_non_local_tags(struct transport *transport,
 535                         struct ref **head,
 536                         struct ref ***tail)
 537 {
 538         struct string_list existing_refs = { NULL, 0, 0, 0 };
 539         struct string_list remote_refs = { NULL, 0, 0, 0 };
 540         struct tag_data data = {head, tail};
 541         const struct ref *ref;
 542         struct string_list_item *item = NULL;
 543
 544         for_each_ref(add_existing, &existing_refs);
 545         for (ref = transport_get_remote_refs(transport); ref; ref = ref->next) {
 546                 if (prefixcmp(ref->name, "refs/tags"))
 547                         continue;
 548
 549                 /*
 550                  * The peeled ref always follows the matching base
 551                  * ref, so if we see a peeled ref that we don't want
 552                  * to fetch then we can mark the ref entry in the list
 553                  * as one to ignore by setting util to NULL.
 554                  */
 555                 if (!strcmp(ref->name + strlen(ref->name) - 3, "^{}")) {
 556                         if (item && !has_sha1_file(ref->old_sha1) &&
 557                             !will_fetch(head, ref->old_sha1) &&
 558                             !has_sha1_file(item->util) &&
 559                             !will_fetch(head, item->util))
 560                                 item->util = NULL;
 561                         item = NULL;
 562                         continue;
 563                 }
 564
 565                 /*
 566                  * If item is non-NULL here, then we previously saw a
 567                  * ref not followed by a peeled reference, so we need
 568                  * to check if it is a lightweight tag that we want to
 569                  * fetch.
 570                  */
 571                 if (item && !has_sha1_file(item->util) &&
 572                     !will_fetch(head, item->util))
 573                         item->util = NULL;
 574
 575                 item = NULL;
 576
 577                 /* skip duplicates and refs that we already have */
 578                 if (string_list_has_string(&remote_refs, ref->name) ||
 579                     string_list_has_string(&existing_refs, ref->name))
 580                         continue;
 581
 582                 item = string_list_insert(ref->name, &remote_refs);
 583                 item->util = (void *)ref->old_sha1;
 584         }
 585         string_list_clear(&existing_refs, 0);
 586
 587         /*
 588          * We may have a final lightweight tag that needs to be
 589          * checked to see if it needs fetching.
 590          */
 591         if (item && !has_sha1_file(item->util) &&
 592             !will_fetch(head, item->util))
 593                 item->util = NULL;
 594
 595         /*
 596          * For all the tags in the remote_refs string list, call
 597          * add_to_tail to add them to the list of refs to be fetched
 598          */
 599         for_each_string_list(add_to_tail, &remote_refs, &data);
 600
 601         string_list_clear(&remote_refs, 0);
 602 }
 603
 604 static void check_not_current_branch(struct ref *ref_map)
 605 {
 606         struct branch *current_branch = branch_get(NULL);
 607
 608         if (is_bare_repository() || !current_branch)
 609                 return;
 610
 611         for (; ref_map; ref_map = ref_map->next)
 612                 if (ref_map->peer_ref && !strcmp(current_branch->refname,
 613                                         ref_map->peer_ref->name))
 614                         die("Refusing to fetch into current branch %s "
 615                             "of non-bare repository", current_branch->refname);
 616 }
 617
 618 static int do_fetch(struct transport *transport,
 619                     struct refspec *refs, int ref_count)
 620 {
 621         struct ref *ref_map;
 622         struct ref *rm;
 623         int autotags = (transport->remote->fetch_tags == 1);
 624         if (transport->remote->fetch_tags == 2 && tags != TAGS_UNSET)
 625                 tags = TAGS_SET;
 626         if (transport->remote->fetch_tags == -1)
 627                 tags = TAGS_UNSET;
 628
 629         if (!transport->get_refs_list || !transport->fetch)
 630                 die("Don't know how to fetch from %s", transport->url);
 631
 632         /* if not appending, truncate FETCH_HEAD */
 633         if (!append) {
 634                 char *filename = git_path("FETCH_HEAD");
 635                 FILE *fp = fopen(filename, "w");
 636                 if (!fp)
 637                         return error("cannot open %s: %s\n", filename, strerror(errno));
 638                 fclose(fp);
 639         }
 640
 641         ref_map = get_ref_map(transport, refs, ref_count, tags, &autotags);
 642         if (!update_head_ok)
 643                 check_not_current_branch(ref_map);
 644
 645         for (rm = ref_map; rm; rm = rm->next) {
 646                 if (rm->peer_ref)
 647                         read_ref(rm->peer_ref->name, rm->peer_ref->old_sha1);
 648         }
 649
 650         if (tags == TAGS_DEFAULT && autotags)
 651                 transport_set_option(transport, TRANS_OPT_FOLLOWTAGS, "1");
 652         if (fetch_refs(transport, ref_map)) {
 653                 free_refs(ref_map);
 654                 return 1;
 655         }
 656         free_refs(ref_map);
 657
 658         /* if neither --no-tags nor --tags was specified, do automated tag
 659          * following ... */
 660         if (tags == TAGS_DEFAULT && autotags) {
 661                 struct ref **tail = &ref_map;
 662                 ref_map = NULL;
 663                 find_non_local_tags(transport, &ref_map, &tail);
 664                 if (ref_map) {
 665                         transport_set_option(transport, TRANS_OPT_FOLLOWTAGS, NULL);
 666                         transport_set_option(transport, TRANS_OPT_DEPTH, "0");
 667                         fetch_refs(transport, ref_map);
 668                 }
 669                 free_refs(ref_map);
 670         }
 671
 672         return 0;
 673 }
 674
 675 static void set_option(const char *name, const char *value)
 676 {
 677         int r = transport_set_option(transport, name, value);
 678         if (r < 0)
 679                 die("Option \"%s\" value \"%s\" is not valid for %s",
 680                         name, value, transport->url);
 681         if (r > 0)
 682                 warning("Option \"%s\" is ignored for %s\n",
 683                         name, transport->url);
 684 }
 685
 686 int cmd_fetch(int argc, const char **argv, const char *prefix)
 687 {
 688         struct remote *remote;
 689         int i;
 690         static const char **refs = NULL;
 691         int ref_nr = 0;
 692         int exit_code;
 693
 694         /* Record the command line for the reflog */
 695         strbuf_addstr(&default_rla, "fetch");
 696         for (i = 1; i < argc; i++)
 697                 strbuf_addf(&default_rla, " %s", argv[i]);
 698
 699         argc = parse_options(argc, argv, prefix,
 700                              builtin_fetch_options, builtin_fetch_usage, 0);
 701
 702         if (argc == 0)
 703                 remote = remote_get(NULL);
 704         else
 705                 remote = remote_get(argv[0]);
 706
 707         if (!remote)
 708                 die("Where do you want to fetch from today?");
 709
 710         transport = transport_get(remote, NULL);
 711         if (verbosity >= 2)
 712                 transport->verbose = 1;
 713         if (verbosity < 0)
 714                 transport->verbose = -1;
 715         if (upload_pack)
 716                 set_option(TRANS_OPT_UPLOADPACK, upload_pack);
 717         if (keep)
 718                 set_option(TRANS_OPT_KEEP, "yes");
 719         if (depth)
 720                 set_option(TRANS_OPT_DEPTH, depth);
 721
 722         if (argc > 1) {
 723                 int j = 0;
 724                 refs = xcalloc(argc + 1, sizeof(const char *));
 725                 for (i = 1; i < argc; i++) {
 726                         if (!strcmp(argv[i], "tag")) {
 727                                 char *ref;
 728                                 i++;
 729                                 if (i >= argc)
 730                                         die("You need to specify a tag name.");
 731                                 ref = xmalloc(strlen(argv[i]) * 2 + 22);
 732                                 strcpy(ref, "refs/tags/");
 733                                 strcat(ref, argv[i]);
 734                                 strcat(ref, ":refs/tags/");
 735                                 strcat(ref, argv[i]);
 736                                 refs[j++] = ref;
 737                         } else
 738                                 refs[j++] = argv[i];
 739                 }
 740                 refs[j] = NULL;
 741                 ref_nr = j;
 742         }
 743
 744         sigchain_push_common(unlock_pack_on_signal);
 745         atexit(unlock_pack);
 746         exit_code = do_fetch(transport,
 747                         parse_fetch_refspec(ref_nr, refs), ref_nr);
 748         transport_disconnect(transport);
 749         transport = NULL;
 750         return exit_code;
 751 }