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         "git fetch [options] <group>",
  18         "git fetch --multiple [options] [<repository> | <group>]...",
  19         "git fetch --all [options]",
  20         NULL
  21 };
  22
  23 enum {
  24         TAGS_UNSET = 0,
  25         TAGS_DEFAULT = 1,
  26         TAGS_SET = 2
  27 };
  28
  29 static int all, append, force, keep, multiple, prune, update_head_ok, verbosity;
  30 static int tags = TAGS_DEFAULT;
  31 static const char *depth;
  32 static const char *upload_pack;
  33 static struct strbuf default_rla = STRBUF_INIT;
  34 static struct transport *transport;
  35
  36 static struct option builtin_fetch_options[] = {
  37         OPT__VERBOSITY(&verbosity),
  38         OPT_BOOLEAN(0, "all", &all,
  39                     "fetch from all remotes"),
  40         OPT_BOOLEAN('a', "append", &append,
  41                     "append to .git/FETCH_HEAD instead of overwriting"),
  42         OPT_STRING(0, "upload-pack", &upload_pack, "PATH",
  43                    "path to upload pack on remote end"),
  44         OPT_BOOLEAN('f', "force", &force,
  45                     "force overwrite of local branch"),
  46         OPT_BOOLEAN('m', "multiple", &multiple,
  47                     "fetch from multiple remotes"),
  48         OPT_SET_INT('t', "tags", &tags,
  49                     "fetch all tags and associated objects", TAGS_SET),
  50         OPT_SET_INT('n', NULL, &tags,
  51                     "do not fetch all tags (--no-tags)", TAGS_UNSET),
  52         OPT_BOOLEAN('p', "prune", &prune,
  53                     "prune tracking branches no longer on remote"),
  54         OPT_BOOLEAN('k', "keep", &keep, "keep downloaded pack"),
  55         OPT_BOOLEAN('u', "update-head-ok", &update_head_ok,
  56                     "allow updating of HEAD ref"),
  57         OPT_STRING(0, "depth", &depth, "DEPTH",
  58                    "deepen history of shallow clone"),
  59         OPT_END()
  60 };
  61
  62 static void unlock_pack(void)
  63 {
  64         if (transport)
  65                 transport_unlock_pack(transport);
  66 }
  67
  68 static void unlock_pack_on_signal(int signo)
  69 {
  70         unlock_pack();
  71         sigchain_pop(signo);
  72         raise(signo);
  73 }
  74
  75 static void add_merge_config(struct ref **head,
  76                            const struct ref *remote_refs,
  77                            struct branch *branch,
  78                            struct ref ***tail)
  79 {
  80         int i;
  81
  82         for (i = 0; i < branch->merge_nr; i++) {
  83                 struct ref *rm, **old_tail = *tail;
  84                 struct refspec refspec;
  85
  86                 for (rm = *head; rm; rm = rm->next) {
  87                         if (branch_merge_matches(branch, i, rm->name)) {
  88                                 rm->merge = 1;
  89                                 break;
  90                         }
  91                 }
  92                 if (rm)
  93                         continue;
  94
  95                 /*
  96                  * Not fetched to a tracking branch?  We need to fetch
  97                  * it anyway to allow this branch's "branch.$name.merge"
  98                  * to be honored by 'git pull', but we do not have to
  99                  * fail if branch.$name.merge is misconfigured to point
 100                  * at a nonexisting branch.  If we were indeed called by
 101                  * 'git pull', it will notice the misconfiguration because
 102                  * there is no entry in the resulting FETCH_HEAD marked
 103                  * for merging.
 104                  */
 105                 refspec.src = branch->merge[i]->src;
 106                 refspec.dst = NULL;
 107                 refspec.pattern = 0;
 108                 refspec.force = 0;
 109                 get_fetch_map(remote_refs, &refspec, tail, 1);
 110                 for (rm = *old_tail; rm; rm = rm->next)
 111                         rm->merge = 1;
 112         }
 113 }
 114
 115 static void find_non_local_tags(struct transport *transport,
 116                         struct ref **head,
 117                         struct ref ***tail);
 118
 119 static struct ref *get_ref_map(struct transport *transport,
 120                                struct refspec *refs, int ref_count, int tags,
 121                                int *autotags)
 122 {
 123         int i;
 124         struct ref *rm;
 125         struct ref *ref_map = NULL;
 126         struct ref **tail = &ref_map;
 127
 128         const struct ref *remote_refs = transport_get_remote_refs(transport);
 129
 130         if (ref_count || tags == TAGS_SET) {
 131                 for (i = 0; i < ref_count; i++) {
 132                         get_fetch_map(remote_refs, &refs[i], &tail, 0);
 133                         if (refs[i].dst && refs[i].dst[0])
 134                                 *autotags = 1;
 135                 }
 136                 /* Merge everything on the command line, but not --tags */
 137                 for (rm = ref_map; rm; rm = rm->next)
 138                         rm->merge = 1;
 139                 if (tags == TAGS_SET)
 140                         get_fetch_map(remote_refs, tag_refspec, &tail, 0);
 141         } else {
 142                 /* Use the defaults */
 143                 struct remote *remote = transport->remote;
 144                 struct branch *branch = branch_get(NULL);
 145                 int has_merge = branch_has_merge_config(branch);
 146                 if (remote && (remote->fetch_refspec_nr || has_merge)) {
 147                         for (i = 0; i < remote->fetch_refspec_nr; i++) {
 148                                 get_fetch_map(remote_refs, &remote->fetch[i], &tail, 0);
 149                                 if (remote->fetch[i].dst &&
 150                                     remote->fetch[i].dst[0])
 151                                         *autotags = 1;
 152                                 if (!i && !has_merge && ref_map &&
 153                                     !remote->fetch[0].pattern)
 154                                         ref_map->merge = 1;
 155                         }
 156                         /*
 157                          * if the remote we're fetching from is the same
 158                          * as given in branch.<name>.remote, we add the
 159                          * ref given in branch.<name>.merge, too.
 160                          */
 161                         if (has_merge &&
 162                             !strcmp(branch->remote_name, remote->name))
 163                                 add_merge_config(&ref_map, remote_refs, branch, &tail);
 164                 } else {
 165                         ref_map = get_remote_ref(remote_refs, "HEAD");
 166                         if (!ref_map)
 167                                 die("Couldn't find remote ref HEAD");
 168                         ref_map->merge = 1;
 169                         tail = &ref_map->next;
 170                 }
 171         }
 172         if (tags == TAGS_DEFAULT && *autotags)
 173                 find_non_local_tags(transport, &ref_map, &tail);
 174         ref_remove_duplicates(ref_map);
 175
 176         return ref_map;
 177 }
 178
 179 #define STORE_REF_ERROR_OTHER 1
 180 #define STORE_REF_ERROR_DF_CONFLICT 2
 181
 182 static int s_update_ref(const char *action,
 183                         struct ref *ref,
 184                         int check_old)
 185 {
 186         char msg[1024];
 187         char *rla = getenv("GIT_REFLOG_ACTION");
 188         static struct ref_lock *lock;
 189
 190         if (!rla)
 191                 rla = default_rla.buf;
 192         snprintf(msg, sizeof(msg), "%s: %s", rla, action);
 193         lock = lock_any_ref_for_update(ref->name,
 194                                        check_old ? ref->old_sha1 : NULL, 0);
 195         if (!lock)
 196                 return errno == ENOTDIR ? STORE_REF_ERROR_DF_CONFLICT :
 197                                           STORE_REF_ERROR_OTHER;
 198         if (write_ref_sha1(lock, ref->new_sha1, msg) < 0)
 199                 return errno == ENOTDIR ? STORE_REF_ERROR_DF_CONFLICT :
 200                                           STORE_REF_ERROR_OTHER;
 201         return 0;
 202 }
 203
 204 #define SUMMARY_WIDTH (2 * DEFAULT_ABBREV + 3)
 205 #define REFCOL_WIDTH  10
 206
 207 static int update_local_ref(struct ref *ref,
 208                             const char *remote,
 209                             char *display)
 210 {
 211         struct commit *current = NULL, *updated;
 212         enum object_type type;
 213         struct branch *current_branch = branch_get(NULL);
 214         const char *pretty_ref = prettify_refname(ref->name);
 215
 216         *display = 0;
 217         type = sha1_object_info(ref->new_sha1, NULL);
 218         if (type < 0)
 219                 die("object %s not found", sha1_to_hex(ref->new_sha1));
 220
 221         if (!hashcmp(ref->old_sha1, ref->new_sha1)) {
 222                 if (verbosity > 0)
 223                         sprintf(display, "= %-*s %-*s -> %s", SUMMARY_WIDTH,
 224                                 "[up to date]", REFCOL_WIDTH, remote,
 225                                 pretty_ref);
 226                 return 0;
 227         }
 228
 229         if (current_branch &&
 230             !strcmp(ref->name, current_branch->name) &&
 231             !(update_head_ok || is_bare_repository()) &&
 232             !is_null_sha1(ref->old_sha1)) {
 233                 /*
 234                  * If this is the head, and it's not okay to update
 235                  * the head, and the old value of the head isn't empty...
 236                  */
 237                 sprintf(display, "! %-*s %-*s -> %s  (can't fetch in current branch)",
 238                         SUMMARY_WIDTH, "[rejected]", REFCOL_WIDTH, remote,
 239                         pretty_ref);
 240                 return 1;
 241         }
 242
 243         if (!is_null_sha1(ref->old_sha1) &&
 244             !prefixcmp(ref->name, "refs/tags/")) {
 245                 int r;
 246                 r = s_update_ref("updating tag", ref, 0);
 247                 sprintf(display, "%c %-*s %-*s -> %s%s", r ? '!' : '-',
 248                         SUMMARY_WIDTH, "[tag update]", REFCOL_WIDTH, remote,
 249                         pretty_ref, r ? "  (unable to update local ref)" : "");
 250                 return r;
 251         }
 252
 253         current = lookup_commit_reference_gently(ref->old_sha1, 1);
 254         updated = lookup_commit_reference_gently(ref->new_sha1, 1);
 255         if (!current || !updated) {
 256                 const char *msg;
 257                 const char *what;
 258                 int r;
 259                 if (!strncmp(ref->name, "refs/tags/", 10)) {
 260                         msg = "storing tag";
 261                         what = "[new tag]";
 262                 }
 263                 else {
 264                         msg = "storing head";
 265                         what = "[new branch]";
 266                 }
 267
 268                 r = s_update_ref(msg, ref, 0);
 269                 sprintf(display, "%c %-*s %-*s -> %s%s", r ? '!' : '*',
 270                         SUMMARY_WIDTH, what, REFCOL_WIDTH, remote, pretty_ref,
 271                         r ? "  (unable to update local ref)" : "");
 272                 return r;
 273         }
 274
 275         if (in_merge_bases(current, &updated, 1)) {
 276                 char quickref[83];
 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("fast forward", ref, 1);
 282                 sprintf(display, "%c %-*s %-*s -> %s%s", r ? '!' : ' ',
 283                         SUMMARY_WIDTH, quickref, REFCOL_WIDTH, remote,
 284                         pretty_ref, r ? "  (unable to update local ref)" : "");
 285                 return r;
 286         } else if (force || ref->force) {
 287                 char quickref[84];
 288                 int r;
 289                 strcpy(quickref, find_unique_abbrev(current->object.sha1, DEFAULT_ABBREV));
 290                 strcat(quickref, "...");
 291                 strcat(quickref, find_unique_abbrev(ref->new_sha1, DEFAULT_ABBREV));
 292                 r = s_update_ref("forced-update", ref, 1);
 293                 sprintf(display, "%c %-*s %-*s -> %s  (%s)", r ? '!' : '+',
 294                         SUMMARY_WIDTH, quickref, REFCOL_WIDTH, remote,
 295                         pretty_ref,
 296                         r ? "unable to update local ref" : "forced update");
 297                 return r;
 298         } else {
 299                 sprintf(display, "! %-*s %-*s -> %s  (non fast forward)",
 300                         SUMMARY_WIDTH, "[rejected]", REFCOL_WIDTH, remote,
 301                         pretty_ref);
 302                 return 1;
 303         }
 304 }
 305
 306 static int store_updated_refs(const char *raw_url, const char *remote_name,
 307                 struct ref *ref_map)
 308 {
 309         FILE *fp;
 310         struct commit *commit;
 311         int url_len, i, note_len, shown_url = 0, rc = 0;
 312         char note[1024];
 313         const char *what, *kind;
 314         struct ref *rm;
 315         char *url, *filename = git_path("FETCH_HEAD");
 316
 317         fp = fopen(filename, "a");
 318         if (!fp)
 319                 return error("cannot open %s: %s\n", filename, strerror(errno));
 320
 321         url = transport_anonymize_url(raw_url);
 322         for (rm = ref_map; rm; rm = rm->next) {
 323                 struct ref *ref = NULL;
 324
 325                 if (rm->peer_ref) {
 326                         ref = xcalloc(1, sizeof(*ref) + strlen(rm->peer_ref->name) + 1);
 327                         strcpy(ref->name, rm->peer_ref->name);
 328                         hashcpy(ref->old_sha1, rm->peer_ref->old_sha1);
 329                         hashcpy(ref->new_sha1, rm->old_sha1);
 330                         ref->force = rm->peer_ref->force;
 331                 }
 332
 333                 commit = lookup_commit_reference_gently(rm->old_sha1, 1);
 334                 if (!commit)
 335                         rm->merge = 0;
 336
 337                 if (!strcmp(rm->name, "HEAD")) {
 338                         kind = "";
 339                         what = "";
 340                 }
 341                 else if (!prefixcmp(rm->name, "refs/heads/")) {
 342                         kind = "branch";
 343                         what = rm->name + 11;
 344                 }
 345                 else if (!prefixcmp(rm->name, "refs/tags/")) {
 346                         kind = "tag";
 347                         what = rm->name + 10;
 348                 }
 349                 else if (!prefixcmp(rm->name, "refs/remotes/")) {
 350                         kind = "remote branch";
 351                         what = rm->name + 13;
 352                 }
 353                 else {
 354                         kind = "";
 355                         what = rm->name;
 356                 }
 357
 358                 url_len = strlen(url);
 359                 for (i = url_len - 1; url[i] == '/' && 0 <= i; i--)
 360                         ;
 361                 url_len = i + 1;
 362                 if (4 < i && !strncmp(".git", url + i - 3, 4))
 363                         url_len = i - 3;
 364
 365                 note_len = 0;
 366                 if (*what) {
 367                         if (*kind)
 368                                 note_len += sprintf(note + note_len, "%s ",
 369                                                     kind);
 370                         note_len += sprintf(note + note_len, "'%s' of ", what);
 371                 }
 372                 note[note_len] = '\0';
 373                 fprintf(fp, "%s\t%s\t%s",
 374                         sha1_to_hex(commit ? commit->object.sha1 :
 375                                     rm->old_sha1),
 376                         rm->merge ? "" : "not-for-merge",
 377                         note);
 378                 for (i = 0; i < url_len; ++i)
 379                         if ('\n' == url[i])
 380                                 fputs("\\n", fp);
 381                         else
 382                                 fputc(url[i], fp);
 383                 fputc('\n', fp);
 384
 385                 if (ref)
 386                         rc |= update_local_ref(ref, what, note);
 387                 else
 388                         sprintf(note, "* %-*s %-*s -> FETCH_HEAD",
 389                                 SUMMARY_WIDTH, *kind ? kind : "branch",
 390                                  REFCOL_WIDTH, *what ? what : "HEAD");
 391                 if (*note) {
 392                         if (verbosity >= 0 && !shown_url) {
 393                                 fprintf(stderr, "From %.*s\n",
 394                                                 url_len, url);
 395                                 shown_url = 1;
 396                         }
 397                         if (verbosity >= 0)
 398                                 fprintf(stderr, " %s\n", note);
 399                 }
 400         }
 401         free(url);
 402         fclose(fp);
 403         if (rc & STORE_REF_ERROR_DF_CONFLICT)
 404                 error("some local refs could not be updated; try running\n"
 405                       " 'git remote prune %s' to remove any old, conflicting "
 406                       "branches", remote_name);
 407         return rc;
 408 }
 409
 410 /*
 411  * We would want to bypass the object transfer altogether if
 412  * everything we are going to fetch already exists and is connected
 413  * locally.
 414  *
 415  * The refs we are going to fetch are in ref_map.  If running
 416  *
 417  *  $ git rev-list --objects --stdin --not --all
 418  *
 419  * (feeding all the refs in ref_map on its standard input)
 420  * does not error out, that means everything reachable from the
 421  * refs we are going to fetch exists and is connected to some of
 422  * our existing refs.
 423  */
 424 static int quickfetch(struct ref *ref_map)
 425 {
 426         struct child_process revlist;
 427         struct ref *ref;
 428         int err;
 429         const char *argv[] = {"rev-list",
 430                 "--quiet", "--objects", "--stdin", "--not", "--all", NULL};
 431
 432         /*
 433          * If we are deepening a shallow clone we already have these
 434          * objects reachable.  Running rev-list here will return with
 435          * a good (0) exit status and we'll bypass the fetch that we
 436          * really need to perform.  Claiming failure now will ensure
 437          * we perform the network exchange to deepen our history.
 438          */
 439         if (depth)
 440                 return -1;
 441
 442         if (!ref_map)
 443                 return 0;
 444
 445         memset(&revlist, 0, sizeof(revlist));
 446         revlist.argv = argv;
 447         revlist.git_cmd = 1;
 448         revlist.no_stdout = 1;
 449         revlist.no_stderr = 1;
 450         revlist.in = -1;
 451
 452         err = start_command(&revlist);
 453         if (err) {
 454                 error("could not run rev-list");
 455                 return err;
 456         }
 457
 458         /*
 459          * If rev-list --stdin encounters an unknown commit, it terminates,
 460          * which will cause SIGPIPE in the write loop below.
 461          */
 462         sigchain_push(SIGPIPE, SIG_IGN);
 463
 464         for (ref = ref_map; ref; ref = ref->next) {
 465                 if (write_in_full(revlist.in, sha1_to_hex(ref->old_sha1), 40) < 0 ||
 466                     write_str_in_full(revlist.in, "\n") < 0) {
 467                         if (errno != EPIPE && errno != EINVAL)
 468                                 error("failed write to rev-list: %s", strerror(errno));
 469                         err = -1;
 470                         break;
 471                 }
 472         }
 473
 474         if (close(revlist.in)) {
 475                 error("failed to close rev-list's stdin: %s", strerror(errno));
 476                 err = -1;
 477         }
 478
 479         sigchain_pop(SIGPIPE);
 480
 481         return finish_command(&revlist) || err;
 482 }
 483
 484 static int fetch_refs(struct transport *transport, struct ref *ref_map)
 485 {
 486         int ret = quickfetch(ref_map);
 487         if (ret)
 488                 ret = transport_fetch_refs(transport, ref_map);
 489         if (!ret)
 490                 ret |= store_updated_refs(transport->url,
 491                                 transport->remote->name,
 492                                 ref_map);
 493         transport_unlock_pack(transport);
 494         return ret;
 495 }
 496
 497 static int prune_refs(struct transport *transport, struct ref *ref_map)
 498 {
 499         int result = 0;
 500         struct ref *ref, *stale_refs = get_stale_heads(transport->remote, ref_map);
 501         const char *dangling_msg = dry_run
 502                 ? "   (%s will become dangling)\n"
 503                 : "   (%s has become dangling)\n";
 504
 505         for (ref = stale_refs; ref; ref = ref->next) {
 506                 if (!dry_run)
 507                         result |= delete_ref(ref->name, NULL, 0);
 508                 if (verbosity >= 0) {
 509                         fprintf(stderr, " x %-*s %-*s -> %s\n",
 510                                 SUMMARY_WIDTH, "[deleted]",
 511                                 REFCOL_WIDTH, "(none)", prettify_refname(ref->name));
 512                         warn_dangling_symref(stderr, dangling_msg, ref->name);
 513                 }
 514         }
 515         free_refs(stale_refs);
 516         return result;
 517 }
 518
 519 static int add_existing(const char *refname, const unsigned char *sha1,
 520                         int flag, void *cbdata)
 521 {
 522         struct string_list *list = (struct string_list *)cbdata;
 523         string_list_insert(refname, list);
 524         return 0;
 525 }
 526
 527 static int will_fetch(struct ref **head, const unsigned char *sha1)
 528 {
 529         struct ref *rm = *head;
 530         while (rm) {
 531                 if (!hashcmp(rm->old_sha1, sha1))
 532                         return 1;
 533                 rm = rm->next;
 534         }
 535         return 0;
 536 }
 537
 538 static void find_non_local_tags(struct transport *transport,
 539                         struct ref **head,
 540                         struct ref ***tail)
 541 {
 542         struct string_list existing_refs = { NULL, 0, 0, 0 };
 543         struct string_list new_refs = { NULL, 0, 0, 1 };
 544         char *ref_name;
 545         int ref_name_len;
 546         const unsigned char *ref_sha1;
 547         const struct ref *tag_ref;
 548         struct ref *rm = NULL;
 549         const struct ref *ref;
 550
 551         for_each_ref(add_existing, &existing_refs);
 552         for (ref = transport_get_remote_refs(transport); ref; ref = ref->next) {
 553                 if (prefixcmp(ref->name, "refs/tags"))
 554                         continue;
 555
 556                 ref_name = xstrdup(ref->name);
 557                 ref_name_len = strlen(ref_name);
 558                 ref_sha1 = ref->old_sha1;
 559
 560                 if (!strcmp(ref_name + ref_name_len - 3, "^{}")) {
 561                         ref_name[ref_name_len - 3] = 0;
 562                         tag_ref = transport_get_remote_refs(transport);
 563                         while (tag_ref) {
 564                                 if (!strcmp(tag_ref->name, ref_name)) {
 565                                         ref_sha1 = tag_ref->old_sha1;
 566                                         break;
 567                                 }
 568                                 tag_ref = tag_ref->next;
 569                         }
 570                 }
 571
 572                 if (!string_list_has_string(&existing_refs, ref_name) &&
 573                     !string_list_has_string(&new_refs, ref_name) &&
 574                     (has_sha1_file(ref->old_sha1) ||
 575                      will_fetch(head, ref->old_sha1))) {
 576                         string_list_insert(ref_name, &new_refs);
 577
 578                         rm = alloc_ref(ref_name);
 579                         rm->peer_ref = alloc_ref(ref_name);
 580                         hashcpy(rm->old_sha1, ref_sha1);
 581
 582                         **tail = rm;
 583                         *tail = &rm->next;
 584                 }
 585                 free(ref_name);
 586         }
 587         string_list_clear(&existing_refs, 0);
 588         string_list_clear(&new_refs, 0);
 589 }
 590
 591 static void check_not_current_branch(struct ref *ref_map)
 592 {
 593         struct branch *current_branch = branch_get(NULL);
 594
 595         if (is_bare_repository() || !current_branch)
 596                 return;
 597
 598         for (; ref_map; ref_map = ref_map->next)
 599                 if (ref_map->peer_ref && !strcmp(current_branch->refname,
 600                                         ref_map->peer_ref->name))
 601                         die("Refusing to fetch into current branch %s "
 602                             "of non-bare repository", current_branch->refname);
 603 }
 604
 605 static int do_fetch(struct transport *transport,
 606                     struct refspec *refs, int ref_count)
 607 {
 608         struct ref *ref_map;
 609         struct ref *rm;
 610         int autotags = (transport->remote->fetch_tags == 1);
 611         if (transport->remote->fetch_tags == 2 && tags != TAGS_UNSET)
 612                 tags = TAGS_SET;
 613         if (transport->remote->fetch_tags == -1)
 614                 tags = TAGS_UNSET;
 615
 616         if (!transport->get_refs_list || !transport->fetch)
 617                 die("Don't know how to fetch from %s", transport->url);
 618
 619         /* if not appending, truncate FETCH_HEAD */
 620         if (!append) {
 621                 char *filename = git_path("FETCH_HEAD");
 622                 FILE *fp = fopen(filename, "w");
 623                 if (!fp)
 624                         return error("cannot open %s: %s\n", filename, strerror(errno));
 625                 fclose(fp);
 626         }
 627
 628         ref_map = get_ref_map(transport, refs, ref_count, tags, &autotags);
 629         if (!update_head_ok)
 630                 check_not_current_branch(ref_map);
 631
 632         for (rm = ref_map; rm; rm = rm->next) {
 633                 if (rm->peer_ref)
 634                         read_ref(rm->peer_ref->name, rm->peer_ref->old_sha1);
 635         }
 636
 637         if (tags == TAGS_DEFAULT && autotags)
 638                 transport_set_option(transport, TRANS_OPT_FOLLOWTAGS, "1");
 639         if (fetch_refs(transport, ref_map)) {
 640                 free_refs(ref_map);
 641                 return 1;
 642         }
 643         if (prune)
 644                 prune_refs(transport, ref_map);
 645         free_refs(ref_map);
 646
 647         /* if neither --no-tags nor --tags was specified, do automated tag
 648          * following ... */
 649         if (tags == TAGS_DEFAULT && autotags) {
 650                 struct ref **tail = &ref_map;
 651                 ref_map = NULL;
 652                 find_non_local_tags(transport, &ref_map, &tail);
 653                 if (ref_map) {
 654                         transport_set_option(transport, TRANS_OPT_FOLLOWTAGS, NULL);
 655                         transport_set_option(transport, TRANS_OPT_DEPTH, "0");
 656                         fetch_refs(transport, ref_map);
 657                 }
 658                 free_refs(ref_map);
 659         }
 660
 661         return 0;
 662 }
 663
 664 static void set_option(const char *name, const char *value)
 665 {
 666         int r = transport_set_option(transport, name, value);
 667         if (r < 0)
 668                 die("Option \"%s\" value \"%s\" is not valid for %s",
 669                         name, value, transport->url);
 670         if (r > 0)
 671                 warning("Option \"%s\" is ignored for %s\n",
 672                         name, transport->url);
 673 }
 674
 675 static int get_one_remote_for_fetch(struct remote *remote, void *priv)
 676 {
 677         struct string_list *list = priv;
 678         if (!remote->skip_default_update)
 679                 string_list_append(remote->name, list);
 680         return 0;
 681 }
 682
 683 struct remote_group_data {
 684         const char *name;
 685         struct string_list *list;
 686 };
 687
 688 static int get_remote_group(const char *key, const char *value, void *priv)
 689 {
 690         struct remote_group_data *g = priv;
 691
 692         if (!prefixcmp(key, "remotes.") &&
 693                         !strcmp(key + 8, g->name)) {
 694                 /* split list by white space */
 695                 int space = strcspn(value, " \t\n");
 696                 while (*value) {
 697                         if (space > 1) {
 698                                 string_list_append(xstrndup(value, space),
 699                                                    g->list);
 700                         }
 701                         value += space + (value[space] != '\0');
 702                         space = strcspn(value, " \t\n");
 703                 }
 704         }
 705
 706         return 0;
 707 }
 708
 709 static int add_remote_or_group(const char *name, struct string_list *list)
 710 {
 711         int prev_nr = list->nr;
 712         struct remote_group_data g = { name, list };
 713
 714         git_config(get_remote_group, &g);
 715         if (list->nr == prev_nr) {
 716                 struct remote *remote;
 717                 if (!remote_is_configured(name))
 718                         return 0;
 719                 remote = remote_get(name);
 720                 string_list_append(remote->name, list);
 721         }
 722         return 1;
 723 }
 724
 725 static int fetch_multiple(struct string_list *list)
 726 {
 727         int i, result = 0;
 728         const char *argv[] = { "fetch", NULL, NULL, NULL, NULL, NULL };
 729         int argc = 1;
 730
 731         if (prune)
 732                 argv[argc++] = "--prune";
 733         if (verbosity >= 2)
 734                 argv[argc++] = "-v";
 735         if (verbosity >= 1)
 736                 argv[argc++] = "-v";
 737         else if (verbosity < 0)
 738                 argv[argc++] = "-q";
 739
 740         for (i = 0; i < list->nr; i++) {
 741                 const char *name = list->items[i].string;
 742                 argv[argc] = name;
 743                 if (verbosity >= 0)
 744                         printf("Fetching %s\n", name);
 745                 if (run_command_v_opt(argv, RUN_GIT_CMD)) {
 746                         error("Could not fetch %s", name);
 747                         result = 1;
 748                 }
 749         }
 750
 751         return result;
 752 }
 753
 754 static int fetch_one(struct remote *remote, int argc, const char **argv)
 755 {
 756         int i;
 757         static const char **refs = NULL;
 758         int ref_nr = 0;
 759         int exit_code;
 760
 761         if (!remote)
 762                 die("Where do you want to fetch from today?");
 763
 764         transport = transport_get(remote, remote->url[0]);
 765         if (verbosity >= 2)
 766                 transport->verbose = 1;
 767         if (verbosity < 0)
 768                 transport->verbose = -1;
 769         if (upload_pack)
 770                 set_option(TRANS_OPT_UPLOADPACK, upload_pack);
 771         if (keep)
 772                 set_option(TRANS_OPT_KEEP, "yes");
 773         if (depth)
 774                 set_option(TRANS_OPT_DEPTH, depth);
 775
 776         if (argc > 0) {
 777                 int j = 0;
 778                 refs = xcalloc(argc + 1, sizeof(const char *));
 779                 for (i = 0; i < argc; i++) {
 780                         if (!strcmp(argv[i], "tag")) {
 781                                 char *ref;
 782                                 i++;
 783                                 if (i >= argc)
 784                                         die("You need to specify a tag name.");
 785                                 ref = xmalloc(strlen(argv[i]) * 2 + 22);
 786                                 strcpy(ref, "refs/tags/");
 787                                 strcat(ref, argv[i]);
 788                                 strcat(ref, ":refs/tags/");
 789                                 strcat(ref, argv[i]);
 790                                 refs[j++] = ref;
 791                         } else
 792                                 refs[j++] = argv[i];
 793                 }
 794                 refs[j] = NULL;
 795                 ref_nr = j;
 796         }
 797
 798         sigchain_push_common(unlock_pack_on_signal);
 799         atexit(unlock_pack);
 800         exit_code = do_fetch(transport,
 801                         parse_fetch_refspec(ref_nr, refs), ref_nr);
 802         transport_disconnect(transport);
 803         transport = NULL;
 804         return exit_code;
 805 }
 806
 807 int cmd_fetch(int argc, const char **argv, const char *prefix)
 808 {
 809         int i;
 810         struct string_list list = { NULL, 0, 0, 0 };
 811         struct remote *remote;
 812         int result = 0;
 813
 814         /* Record the command line for the reflog */
 815         strbuf_addstr(&default_rla, "fetch");
 816         for (i = 1; i < argc; i++)
 817                 strbuf_addf(&default_rla, " %s", argv[i]);
 818
 819         argc = parse_options(argc, argv, prefix,
 820                              builtin_fetch_options, builtin_fetch_usage, 0);
 821
 822         if (all) {
 823                 if (argc == 1)
 824                         die("fetch --all does not take a repository argument");
 825                 else if (argc > 1)
 826                         die("fetch --all does not make sense with refspecs");
 827                 (void) for_each_remote(get_one_remote_for_fetch, &list);
 828                 result = fetch_multiple(&list);
 829         } else if (argc == 0) {
 830                 /* No arguments -- use default remote */
 831                 remote = remote_get(NULL);
 832                 result = fetch_one(remote, argc, argv);
 833         } else if (multiple) {
 834                 /* All arguments are assumed to be remotes or groups */
 835                 for (i = 0; i < argc; i++)
 836                         if (!add_remote_or_group(argv[i], &list))
 837                                 die("No such remote or remote group: %s", argv[i]);
 838                 result = fetch_multiple(&list);
 839         } else {
 840                 /* Single remote or group */
 841                 (void) add_remote_or_group(argv[0], &list);
 842                 if (list.nr > 1) {
 843                         /* More than one remote */
 844                         if (argc > 1)
 845                                 die("Fetching a group and specifying refspecs does not make sense");
 846                         result = fetch_multiple(&list);
 847                 } else {
 848                         /* Zero or one remotes */
 849                         remote = remote_get(argv[0]);
 850                         result = fetch_one(remote, argc-1, argv+1);
 851                 }
 852         }
 853
 854         /* All names were strdup()ed or strndup()ed */
 855         list.strdup_strings = 1;
 856         string_list_clear(&list, 0);
 857
 858         return result;
 859 }