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 #include "transport.h"
  15
  16 static const char * const builtin_fetch_usage[] = {
  17         "git fetch [<options>] [<repository> [<refspec>...]]",
  18         "git fetch [<options>] <group>",
  19         "git fetch --multiple [<options>] [<repository> | <group>]...",
  20         "git fetch --all [<options>]",
  21         NULL
  22 };
  23
  24 enum {
  25         TAGS_UNSET = 0,
  26         TAGS_DEFAULT = 1,
  27         TAGS_SET = 2
  28 };
  29
  30 static int all, append, dry_run, force, keep, multiple, prune, update_head_ok, verbosity;
  31 static int progress;
  32 static int tags = TAGS_DEFAULT;
  33 static const char *depth;
  34 static const char *upload_pack;
  35 static struct strbuf default_rla = STRBUF_INIT;
  36 static struct transport *transport;
  37
  38 static struct option builtin_fetch_options[] = {
  39         OPT__VERBOSITY(&verbosity),
  40         OPT_BOOLEAN(0, "all", &all,
  41                     "fetch from all remotes"),
  42         OPT_BOOLEAN('a', "append", &append,
  43                     "append to .git/FETCH_HEAD instead of overwriting"),
  44         OPT_STRING(0, "upload-pack", &upload_pack, "PATH",
  45                    "path to upload pack on remote end"),
  46         OPT_BOOLEAN('f', "force", &force,
  47                     "force overwrite of local branch"),
  48         OPT_BOOLEAN('m', "multiple", &multiple,
  49                     "fetch from multiple remotes"),
  50         OPT_SET_INT('t', "tags", &tags,
  51                     "fetch all tags and associated objects", TAGS_SET),
  52         OPT_SET_INT('n', NULL, &tags,
  53                     "do not fetch all tags (--no-tags)", TAGS_UNSET),
  54         OPT_BOOLEAN('p', "prune", &prune,
  55                     "prune tracking branches no longer on remote"),
  56         OPT_BOOLEAN(0, "dry-run", &dry_run,
  57                     "dry run"),
  58         OPT_BOOLEAN('k', "keep", &keep, "keep downloaded pack"),
  59         OPT_BOOLEAN('u', "update-head-ok", &update_head_ok,
  60                     "allow updating of HEAD ref"),
  61         OPT_BOOLEAN(0, "progress", &progress, "force progress reporting"),
  62         OPT_STRING(0, "depth", &depth, "DEPTH",
  63                    "deepen history of shallow clone"),
  64         OPT_END()
  65 };
  66
  67 static void unlock_pack(void)
  68 {
  69         if (transport)
  70                 transport_unlock_pack(transport);
  71 }
  72
  73 static void unlock_pack_on_signal(int signo)
  74 {
  75         unlock_pack();
  76         sigchain_pop(signo);
  77         raise(signo);
  78 }
  79
  80 static void add_merge_config(struct ref **head,
  81                            const struct ref *remote_refs,
  82                            struct branch *branch,
  83                            struct ref ***tail)
  84 {
  85         int i;
  86
  87         for (i = 0; i < branch->merge_nr; i++) {
  88                 struct ref *rm, **old_tail = *tail;
  89                 struct refspec refspec;
  90
  91                 for (rm = *head; rm; rm = rm->next) {
  92                         if (branch_merge_matches(branch, i, rm->name)) {
  93                                 rm->merge = 1;
  94                                 break;
  95                         }
  96                 }
  97                 if (rm)
  98                         continue;
  99
 100                 /*
 101                  * Not fetched to a tracking branch?  We need to fetch
 102                  * it anyway to allow this branch's "branch.$name.merge"
 103                  * to be honored by 'git pull', but we do not have to
 104                  * fail if branch.$name.merge is misconfigured to point
 105                  * at a nonexisting branch.  If we were indeed called by
 106                  * 'git pull', it will notice the misconfiguration because
 107                  * there is no entry in the resulting FETCH_HEAD marked
 108                  * for merging.
 109                  */
 110                 memset(&refspec, 0, sizeof(refspec));
 111                 refspec.src = branch->merge[i]->src;
 112                 get_fetch_map(remote_refs, &refspec, tail, 1);
 113                 for (rm = *old_tail; rm; rm = rm->next)
 114                         rm->merge = 1;
 115         }
 116 }
 117
 118 static void find_non_local_tags(struct transport *transport,
 119                         struct ref **head,
 120                         struct ref ***tail);
 121
 122 static struct ref *get_ref_map(struct transport *transport,
 123                                struct refspec *refs, int ref_count, int tags,
 124                                int *autotags)
 125 {
 126         int i;
 127         struct ref *rm;
 128         struct ref *ref_map = NULL;
 129         struct ref **tail = &ref_map;
 130
 131         const struct ref *remote_refs = transport_get_remote_refs(transport);
 132
 133         if (ref_count || tags == TAGS_SET) {
 134                 for (i = 0; i < ref_count; i++) {
 135                         get_fetch_map(remote_refs, &refs[i], &tail, 0);
 136                         if (refs[i].dst && refs[i].dst[0])
 137                                 *autotags = 1;
 138                 }
 139                 /* Merge everything on the command line, but not --tags */
 140                 for (rm = ref_map; rm; rm = rm->next)
 141                         rm->merge = 1;
 142                 if (tags == TAGS_SET)
 143                         get_fetch_map(remote_refs, tag_refspec, &tail, 0);
 144         } else {
 145                 /* Use the defaults */
 146                 struct remote *remote = transport->remote;
 147                 struct branch *branch = branch_get(NULL);
 148                 int has_merge = branch_has_merge_config(branch);
 149                 if (remote &&
 150                     (remote->fetch_refspec_nr ||
 151                      (has_merge && !strcmp(branch->remote_name, remote->name)))) {
 152                         for (i = 0; i < remote->fetch_refspec_nr; i++) {
 153                                 get_fetch_map(remote_refs, &remote->fetch[i], &tail, 0);
 154                                 if (remote->fetch[i].dst &&
 155                                     remote->fetch[i].dst[0])
 156                                         *autotags = 1;
 157                                 if (!i && !has_merge && ref_map &&
 158                                     !remote->fetch[0].pattern)
 159                                         ref_map->merge = 1;
 160                         }
 161                         /*
 162                          * if the remote we're fetching from is the same
 163                          * as given in branch.<name>.remote, we add the
 164                          * ref given in branch.<name>.merge, too.
 165                          */
 166                         if (has_merge &&
 167                             !strcmp(branch->remote_name, remote->name))
 168                                 add_merge_config(&ref_map, remote_refs, branch, &tail);
 169                 } else {
 170                         ref_map = get_remote_ref(remote_refs, "HEAD");
 171                         if (!ref_map)
 172                                 die("Couldn't find remote ref HEAD");
 173                         ref_map->merge = 1;
 174                         tail = &ref_map->next;
 175                 }
 176         }
 177         if (tags == TAGS_DEFAULT && *autotags)
 178                 find_non_local_tags(transport, &ref_map, &tail);
 179         ref_remove_duplicates(ref_map);
 180
 181         return ref_map;
 182 }
 183
 184 #define STORE_REF_ERROR_OTHER 1
 185 #define STORE_REF_ERROR_DF_CONFLICT 2
 186
 187 static int s_update_ref(const char *action,
 188                         struct ref *ref,
 189                         int check_old)
 190 {
 191         char msg[1024];
 192         char *rla = getenv("GIT_REFLOG_ACTION");
 193         static struct ref_lock *lock;
 194
 195         if (dry_run)
 196                 return 0;
 197         if (!rla)
 198                 rla = default_rla.buf;
 199         snprintf(msg, sizeof(msg), "%s: %s", rla, action);
 200         lock = lock_any_ref_for_update(ref->name,
 201                                        check_old ? ref->old_sha1 : NULL, 0);
 202         if (!lock)
 203                 return errno == ENOTDIR ? STORE_REF_ERROR_DF_CONFLICT :
 204                                           STORE_REF_ERROR_OTHER;
 205         if (write_ref_sha1(lock, ref->new_sha1, msg) < 0)
 206                 return errno == ENOTDIR ? STORE_REF_ERROR_DF_CONFLICT :
 207                                           STORE_REF_ERROR_OTHER;
 208         return 0;
 209 }
 210
 211 #define REFCOL_WIDTH  10
 212
 213 static int update_local_ref(struct ref *ref,
 214                             const char *remote,
 215                             char *display)
 216 {
 217         struct commit *current = NULL, *updated;
 218         enum object_type type;
 219         struct branch *current_branch = branch_get(NULL);
 220         const char *pretty_ref = prettify_refname(ref->name);
 221
 222         *display = 0;
 223         type = sha1_object_info(ref->new_sha1, NULL);
 224         if (type < 0)
 225                 die("object %s not found", sha1_to_hex(ref->new_sha1));
 226
 227         if (!hashcmp(ref->old_sha1, ref->new_sha1)) {
 228                 if (verbosity > 0)
 229                         sprintf(display, "= %-*s %-*s -> %s", TRANSPORT_SUMMARY_WIDTH,
 230                                 "[up to date]", REFCOL_WIDTH, remote,
 231                                 pretty_ref);
 232                 return 0;
 233         }
 234
 235         if (current_branch &&
 236             !strcmp(ref->name, current_branch->name) &&
 237             !(update_head_ok || is_bare_repository()) &&
 238             !is_null_sha1(ref->old_sha1)) {
 239                 /*
 240                  * If this is the head, and it's not okay to update
 241                  * the head, and the old value of the head isn't empty...
 242                  */
 243                 sprintf(display, "! %-*s %-*s -> %s  (can't fetch in current branch)",
 244                         TRANSPORT_SUMMARY_WIDTH, "[rejected]", REFCOL_WIDTH, remote,
 245                         pretty_ref);
 246                 return 1;
 247         }
 248
 249         if (!is_null_sha1(ref->old_sha1) &&
 250             !prefixcmp(ref->name, "refs/tags/")) {
 251                 int r;
 252                 r = s_update_ref("updating tag", ref, 0);
 253                 sprintf(display, "%c %-*s %-*s -> %s%s", r ? '!' : '-',
 254                         TRANSPORT_SUMMARY_WIDTH, "[tag update]", REFCOL_WIDTH, remote,
 255                         pretty_ref, r ? "  (unable to update local ref)" : "");
 256                 return r;
 257         }
 258
 259         current = lookup_commit_reference_gently(ref->old_sha1, 1);
 260         updated = lookup_commit_reference_gently(ref->new_sha1, 1);
 261         if (!current || !updated) {
 262                 const char *msg;
 263                 const char *what;
 264                 int r;
 265                 if (!strncmp(ref->name, "refs/tags/", 10)) {
 266                         msg = "storing tag";
 267                         what = "[new tag]";
 268                 }
 269                 else {
 270                         msg = "storing head";
 271                         what = "[new branch]";
 272                 }
 273
 274                 r = s_update_ref(msg, ref, 0);
 275                 sprintf(display, "%c %-*s %-*s -> %s%s", r ? '!' : '*',
 276                         TRANSPORT_SUMMARY_WIDTH, what, REFCOL_WIDTH, remote, pretty_ref,
 277                         r ? "  (unable to update local ref)" : "");
 278                 return r;
 279         }
 280
 281         if (in_merge_bases(current, &updated, 1)) {
 282                 char quickref[83];
 283                 int r;
 284                 strcpy(quickref, find_unique_abbrev(current->object.sha1, DEFAULT_ABBREV));
 285                 strcat(quickref, "..");
 286                 strcat(quickref, find_unique_abbrev(ref->new_sha1, DEFAULT_ABBREV));
 287                 r = s_update_ref("fast-forward", ref, 1);
 288                 sprintf(display, "%c %-*s %-*s -> %s%s", r ? '!' : ' ',
 289                         TRANSPORT_SUMMARY_WIDTH, quickref, REFCOL_WIDTH, remote,
 290                         pretty_ref, r ? "  (unable to update local ref)" : "");
 291                 return r;
 292         } else if (force || ref->force) {
 293                 char quickref[84];
 294                 int r;
 295                 strcpy(quickref, find_unique_abbrev(current->object.sha1, DEFAULT_ABBREV));
 296                 strcat(quickref, "...");
 297                 strcat(quickref, find_unique_abbrev(ref->new_sha1, DEFAULT_ABBREV));
 298                 r = s_update_ref("forced-update", ref, 1);
 299                 sprintf(display, "%c %-*s %-*s -> %s  (%s)", r ? '!' : '+',
 300                         TRANSPORT_SUMMARY_WIDTH, quickref, REFCOL_WIDTH, remote,
 301                         pretty_ref,
 302                         r ? "unable to update local ref" : "forced update");
 303                 return r;
 304         } else {
 305                 sprintf(display, "! %-*s %-*s -> %s  (non-fast-forward)",
 306                         TRANSPORT_SUMMARY_WIDTH, "[rejected]", REFCOL_WIDTH, remote,
 307                         pretty_ref);
 308                 return 1;
 309         }
 310 }
 311
 312 static int store_updated_refs(const char *raw_url, const char *remote_name,
 313                 struct ref *ref_map)
 314 {
 315         FILE *fp;
 316         struct commit *commit;
 317         int url_len, i, note_len, shown_url = 0, rc = 0;
 318         char note[1024];
 319         const char *what, *kind;
 320         struct ref *rm;
 321         char *url, *filename = dry_run ? "/dev/null" : git_path("FETCH_HEAD");
 322
 323         fp = fopen(filename, "a");
 324         if (!fp)
 325                 return error("cannot open %s: %s\n", filename, strerror(errno));
 326
 327         if (raw_url)
 328                 url = transport_anonymize_url(raw_url);
 329         else
 330                 url = xstrdup("foreign");
 331         for (rm = ref_map; rm; rm = rm->next) {
 332                 struct ref *ref = NULL;
 333
 334                 if (rm->peer_ref) {
 335                         ref = xcalloc(1, sizeof(*ref) + strlen(rm->peer_ref->name) + 1);
 336                         strcpy(ref->name, rm->peer_ref->name);
 337                         hashcpy(ref->old_sha1, rm->peer_ref->old_sha1);
 338                         hashcpy(ref->new_sha1, rm->old_sha1);
 339                         ref->force = rm->peer_ref->force;
 340                 }
 341
 342                 commit = lookup_commit_reference_gently(rm->old_sha1, 1);
 343                 if (!commit)
 344                         rm->merge = 0;
 345
 346                 if (!strcmp(rm->name, "HEAD")) {
 347                         kind = "";
 348                         what = "";
 349                 }
 350                 else if (!prefixcmp(rm->name, "refs/heads/")) {
 351                         kind = "branch";
 352                         what = rm->name + 11;
 353                 }
 354                 else if (!prefixcmp(rm->name, "refs/tags/")) {
 355                         kind = "tag";
 356                         what = rm->name + 10;
 357                 }
 358                 else if (!prefixcmp(rm->name, "refs/remotes/")) {
 359                         kind = "remote branch";
 360                         what = rm->name + 13;
 361                 }
 362                 else {
 363                         kind = "";
 364                         what = rm->name;
 365                 }
 366
 367                 url_len = strlen(url);
 368                 for (i = url_len - 1; url[i] == '/' && 0 <= i; i--)
 369                         ;
 370                 url_len = i + 1;
 371                 if (4 < i && !strncmp(".git", url + i - 3, 4))
 372                         url_len = i - 3;
 373
 374                 note_len = 0;
 375                 if (*what) {
 376                         if (*kind)
 377                                 note_len += sprintf(note + note_len, "%s ",
 378                                                     kind);
 379                         note_len += sprintf(note + note_len, "'%s' of ", what);
 380                 }
 381                 note[note_len] = '\0';
 382                 fprintf(fp, "%s\t%s\t%s",
 383                         sha1_to_hex(commit ? commit->object.sha1 :
 384                                     rm->old_sha1),
 385                         rm->merge ? "" : "not-for-merge",
 386                         note);
 387                 for (i = 0; i < url_len; ++i)
 388                         if ('\n' == url[i])
 389                                 fputs("\\n", fp);
 390                         else
 391                                 fputc(url[i], fp);
 392                 fputc('\n', fp);
 393
 394                 if (ref) {
 395                         rc |= update_local_ref(ref, what, note);
 396                         free(ref);
 397                 } else
 398                         sprintf(note, "* %-*s %-*s -> FETCH_HEAD",
 399                                 TRANSPORT_SUMMARY_WIDTH, *kind ? kind : "branch",
 400                                  REFCOL_WIDTH, *what ? what : "HEAD");
 401                 if (*note) {
 402                         if (verbosity >= 0 && !shown_url) {
 403                                 fprintf(stderr, "From %.*s\n",
 404                                                 url_len, url);
 405                                 shown_url = 1;
 406                         }
 407                         if (verbosity >= 0)
 408                                 fprintf(stderr, " %s\n", note);
 409                 }
 410         }
 411         free(url);
 412         fclose(fp);
 413         if (rc & STORE_REF_ERROR_DF_CONFLICT)
 414                 error("some local refs could not be updated; try running\n"
 415                       " 'git remote prune %s' to remove any old, conflicting "
 416                       "branches", remote_name);
 417         return rc;
 418 }
 419
 420 /*
 421  * We would want to bypass the object transfer altogether if
 422  * everything we are going to fetch already exists and is connected
 423  * locally.
 424  *
 425  * The refs we are going to fetch are in ref_map.  If running
 426  *
 427  *  $ git rev-list --objects --stdin --not --all
 428  *
 429  * (feeding all the refs in ref_map on its standard input)
 430  * does not error out, that means everything reachable from the
 431  * refs we are going to fetch exists and is connected to some of
 432  * our existing refs.
 433  */
 434 static int quickfetch(struct ref *ref_map)
 435 {
 436         struct child_process revlist;
 437         struct ref *ref;
 438         int err;
 439         const char *argv[] = {"rev-list",
 440                 "--quiet", "--objects", "--stdin", "--not", "--all", NULL};
 441
 442         /*
 443          * If we are deepening a shallow clone we already have these
 444          * objects reachable.  Running rev-list here will return with
 445          * a good (0) exit status and we'll bypass the fetch that we
 446          * really need to perform.  Claiming failure now will ensure
 447          * we perform the network exchange to deepen our history.
 448          */
 449         if (depth)
 450                 return -1;
 451
 452         if (!ref_map)
 453                 return 0;
 454
 455         memset(&revlist, 0, sizeof(revlist));
 456         revlist.argv = argv;
 457         revlist.git_cmd = 1;
 458         revlist.no_stdout = 1;
 459         revlist.no_stderr = 1;
 460         revlist.in = -1;
 461
 462         err = start_command(&revlist);
 463         if (err) {
 464                 error("could not run rev-list");
 465                 return err;
 466         }
 467
 468         /*
 469          * If rev-list --stdin encounters an unknown commit, it terminates,
 470          * which will cause SIGPIPE in the write loop below.
 471          */
 472         sigchain_push(SIGPIPE, SIG_IGN);
 473
 474         for (ref = ref_map; ref; ref = ref->next) {
 475                 if (write_in_full(revlist.in, sha1_to_hex(ref->old_sha1), 40) < 0 ||
 476                     write_str_in_full(revlist.in, "\n") < 0) {
 477                         if (errno != EPIPE && errno != EINVAL)
 478                                 error("failed write to rev-list: %s", strerror(errno));
 479                         err = -1;
 480                         break;
 481                 }
 482         }
 483
 484         if (close(revlist.in)) {
 485                 error("failed to close rev-list's stdin: %s", strerror(errno));
 486                 err = -1;
 487         }
 488
 489         sigchain_pop(SIGPIPE);
 490
 491         return finish_command(&revlist) || err;
 492 }
 493
 494 static int fetch_refs(struct transport *transport, struct ref *ref_map)
 495 {
 496         int ret = quickfetch(ref_map);
 497         if (ret)
 498                 ret = transport_fetch_refs(transport, ref_map);
 499         if (!ret)
 500                 ret |= store_updated_refs(transport->url,
 501                                 transport->remote->name,
 502                                 ref_map);
 503         transport_unlock_pack(transport);
 504         return ret;
 505 }
 506
 507 static int prune_refs(struct transport *transport, struct ref *ref_map)
 508 {
 509         int result = 0;
 510         struct ref *ref, *stale_refs = get_stale_heads(transport->remote, ref_map);
 511         const char *dangling_msg = dry_run
 512                 ? "   (%s will become dangling)\n"
 513                 : "   (%s has become dangling)\n";
 514
 515         for (ref = stale_refs; ref; ref = ref->next) {
 516                 if (!dry_run)
 517                         result |= delete_ref(ref->name, NULL, 0);
 518                 if (verbosity >= 0) {
 519                         fprintf(stderr, " x %-*s %-*s -> %s\n",
 520                                 TRANSPORT_SUMMARY_WIDTH, "[deleted]",
 521                                 REFCOL_WIDTH, "(none)", prettify_refname(ref->name));
 522                         warn_dangling_symref(stderr, dangling_msg, ref->name);
 523                 }
 524         }
 525         free_refs(stale_refs);
 526         return result;
 527 }
 528
 529 static int add_existing(const char *refname, const unsigned char *sha1,
 530                         int flag, void *cbdata)
 531 {
 532         struct string_list *list = (struct string_list *)cbdata;
 533         struct string_list_item *item = string_list_insert(refname, list);
 534         item->util = (void *)sha1;
 535         return 0;
 536 }
 537
 538 static int will_fetch(struct ref **head, const unsigned char *sha1)
 539 {
 540         struct ref *rm = *head;
 541         while (rm) {
 542                 if (!hashcmp(rm->old_sha1, sha1))
 543                         return 1;
 544                 rm = rm->next;
 545         }
 546         return 0;
 547 }
 548
 549 struct tag_data {
 550         struct ref **head;
 551         struct ref ***tail;
 552 };
 553
 554 static int add_to_tail(struct string_list_item *item, void *cb_data)
 555 {
 556         struct tag_data *data = (struct tag_data *)cb_data;
 557         struct ref *rm = NULL;
 558
 559         /* We have already decided to ignore this item */
 560         if (!item->util)
 561                 return 0;
 562
 563         rm = alloc_ref(item->string);
 564         rm->peer_ref = alloc_ref(item->string);
 565         hashcpy(rm->old_sha1, item->util);
 566
 567         **data->tail = rm;
 568         *data->tail = &rm->next;
 569
 570         return 0;
 571 }
 572
 573 static void find_non_local_tags(struct transport *transport,
 574                         struct ref **head,
 575                         struct ref ***tail)
 576 {
 577         struct string_list existing_refs = { NULL, 0, 0, 0 };
 578         struct string_list remote_refs = { NULL, 0, 0, 0 };
 579         struct tag_data data = {head, tail};
 580         const struct ref *ref;
 581         struct string_list_item *item = NULL;
 582
 583         for_each_ref(add_existing, &existing_refs);
 584         for (ref = transport_get_remote_refs(transport); ref; ref = ref->next) {
 585                 if (prefixcmp(ref->name, "refs/tags"))
 586                         continue;
 587
 588                 /*
 589                  * The peeled ref always follows the matching base
 590                  * ref, so if we see a peeled ref that we don't want
 591                  * to fetch then we can mark the ref entry in the list
 592                  * as one to ignore by setting util to NULL.
 593                  */
 594                 if (!suffixcmp(ref->name, "^{}")) {
 595                         if (item && !has_sha1_file(ref->old_sha1) &&
 596                             !will_fetch(head, ref->old_sha1) &&
 597                             !has_sha1_file(item->util) &&
 598                             !will_fetch(head, item->util))
 599                                 item->util = NULL;
 600                         item = NULL;
 601                         continue;
 602                 }
 603
 604                 /*
 605                  * If item is non-NULL here, then we previously saw a
 606                  * ref not followed by a peeled reference, so we need
 607                  * to check if it is a lightweight tag that we want to
 608                  * fetch.
 609                  */
 610                 if (item && !has_sha1_file(item->util) &&
 611                     !will_fetch(head, item->util))
 612                         item->util = NULL;
 613
 614                 item = NULL;
 615
 616                 /* skip duplicates and refs that we already have */
 617                 if (string_list_has_string(&remote_refs, ref->name) ||
 618                     string_list_has_string(&existing_refs, ref->name))
 619                         continue;
 620
 621                 item = string_list_insert(ref->name, &remote_refs);
 622                 item->util = (void *)ref->old_sha1;
 623         }
 624         string_list_clear(&existing_refs, 0);
 625
 626         /*
 627          * We may have a final lightweight tag that needs to be
 628          * checked to see if it needs fetching.
 629          */
 630         if (item && !has_sha1_file(item->util) &&
 631             !will_fetch(head, item->util))
 632                 item->util = NULL;
 633
 634         /*
 635          * For all the tags in the remote_refs string list, call
 636          * add_to_tail to add them to the list of refs to be fetched
 637          */
 638         for_each_string_list(add_to_tail, &remote_refs, &data);
 639
 640         string_list_clear(&remote_refs, 0);
 641 }
 642
 643 static void check_not_current_branch(struct ref *ref_map)
 644 {
 645         struct branch *current_branch = branch_get(NULL);
 646
 647         if (is_bare_repository() || !current_branch)
 648                 return;
 649
 650         for (; ref_map; ref_map = ref_map->next)
 651                 if (ref_map->peer_ref && !strcmp(current_branch->refname,
 652                                         ref_map->peer_ref->name))
 653                         die("Refusing to fetch into current branch %s "
 654                             "of non-bare repository", current_branch->refname);
 655 }
 656
 657 static int truncate_fetch_head(void)
 658 {
 659         char *filename = git_path("FETCH_HEAD");
 660         FILE *fp = fopen(filename, "w");
 661
 662         if (!fp)
 663                 return error("cannot open %s: %s\n", filename, strerror(errno));
 664         fclose(fp);
 665         return 0;
 666 }
 667
 668 static int do_fetch(struct transport *transport,
 669                     struct refspec *refs, int ref_count)
 670 {
 671         struct string_list existing_refs = { NULL, 0, 0, 0 };
 672         struct string_list_item *peer_item = NULL;
 673         struct ref *ref_map;
 674         struct ref *rm;
 675         int autotags = (transport->remote->fetch_tags == 1);
 676
 677         for_each_ref(add_existing, &existing_refs);
 678
 679         if (transport->remote->fetch_tags == 2 && tags != TAGS_UNSET)
 680                 tags = TAGS_SET;
 681         if (transport->remote->fetch_tags == -1)
 682                 tags = TAGS_UNSET;
 683
 684         if (!transport->get_refs_list || !transport->fetch)
 685                 die("Don't know how to fetch from %s", transport->url);
 686
 687         /* if not appending, truncate FETCH_HEAD */
 688         if (!append && !dry_run) {
 689                 int errcode = truncate_fetch_head();
 690                 if (errcode)
 691                         return errcode;
 692         }
 693
 694         ref_map = get_ref_map(transport, refs, ref_count, tags, &autotags);
 695         if (!update_head_ok)
 696                 check_not_current_branch(ref_map);
 697
 698         for (rm = ref_map; rm; rm = rm->next) {
 699                 if (rm->peer_ref) {
 700                         peer_item = string_list_lookup(rm->peer_ref->name,
 701                                                        &existing_refs);
 702                         if (peer_item)
 703                                 hashcpy(rm->peer_ref->old_sha1,
 704                                         peer_item->util);
 705                 }
 706         }
 707
 708         if (tags == TAGS_DEFAULT && autotags)
 709                 transport_set_option(transport, TRANS_OPT_FOLLOWTAGS, "1");
 710         if (fetch_refs(transport, ref_map)) {
 711                 free_refs(ref_map);
 712                 return 1;
 713         }
 714         if (prune)
 715                 prune_refs(transport, ref_map);
 716         free_refs(ref_map);
 717
 718         /* if neither --no-tags nor --tags was specified, do automated tag
 719          * following ... */
 720         if (tags == TAGS_DEFAULT && autotags) {
 721                 struct ref **tail = &ref_map;
 722                 ref_map = NULL;
 723                 find_non_local_tags(transport, &ref_map, &tail);
 724                 if (ref_map) {
 725                         transport_set_option(transport, TRANS_OPT_FOLLOWTAGS, NULL);
 726                         transport_set_option(transport, TRANS_OPT_DEPTH, "0");
 727                         fetch_refs(transport, ref_map);
 728                 }
 729                 free_refs(ref_map);
 730         }
 731
 732         return 0;
 733 }
 734
 735 static void set_option(const char *name, const char *value)
 736 {
 737         int r = transport_set_option(transport, name, value);
 738         if (r < 0)
 739                 die("Option \"%s\" value \"%s\" is not valid for %s",
 740                         name, value, transport->url);
 741         if (r > 0)
 742                 warning("Option \"%s\" is ignored for %s\n",
 743                         name, transport->url);
 744 }
 745
 746 static int get_one_remote_for_fetch(struct remote *remote, void *priv)
 747 {
 748         struct string_list *list = priv;
 749         if (!remote->skip_default_update)
 750                 string_list_append(remote->name, list);
 751         return 0;
 752 }
 753
 754 struct remote_group_data {
 755         const char *name;
 756         struct string_list *list;
 757 };
 758
 759 static int get_remote_group(const char *key, const char *value, void *priv)
 760 {
 761         struct remote_group_data *g = priv;
 762
 763         if (!prefixcmp(key, "remotes.") &&
 764                         !strcmp(key + 8, g->name)) {
 765                 /* split list by white space */
 766                 int space = strcspn(value, " \t\n");
 767                 while (*value) {
 768                         if (space > 1) {
 769                                 string_list_append(xstrndup(value, space),
 770                                                    g->list);
 771                         }
 772                         value += space + (value[space] != '\0');
 773                         space = strcspn(value, " \t\n");
 774                 }
 775         }
 776
 777         return 0;
 778 }
 779
 780 static int add_remote_or_group(const char *name, struct string_list *list)
 781 {
 782         int prev_nr = list->nr;
 783         struct remote_group_data g = { name, list };
 784
 785         git_config(get_remote_group, &g);
 786         if (list->nr == prev_nr) {
 787                 struct remote *remote;
 788                 if (!remote_is_configured(name))
 789                         return 0;
 790                 remote = remote_get(name);
 791                 string_list_append(remote->name, list);
 792         }
 793         return 1;
 794 }
 795
 796 static int fetch_multiple(struct string_list *list)
 797 {
 798         int i, result = 0;
 799         const char *argv[11] = { "fetch", "--append" };
 800         int argc = 2;
 801
 802         if (dry_run)
 803                 argv[argc++] = "--dry-run";
 804         if (prune)
 805                 argv[argc++] = "--prune";
 806         if (update_head_ok)
 807                 argv[argc++] = "--update-head-ok";
 808         if (force)
 809                 argv[argc++] = "--force";
 810         if (keep)
 811                 argv[argc++] = "--keep";
 812         if (verbosity >= 2)
 813                 argv[argc++] = "-v";
 814         if (verbosity >= 1)
 815                 argv[argc++] = "-v";
 816         else if (verbosity < 0)
 817                 argv[argc++] = "-q";
 818
 819         if (!append && !dry_run) {
 820                 int errcode = truncate_fetch_head();
 821                 if (errcode)
 822                         return errcode;
 823         }
 824
 825         for (i = 0; i < list->nr; i++) {
 826                 const char *name = list->items[i].string;
 827                 argv[argc] = name;
 828                 argv[argc + 1] = NULL;
 829                 if (verbosity >= 0)
 830                         printf("Fetching %s\n", name);
 831                 if (run_command_v_opt(argv, RUN_GIT_CMD)) {
 832                         error("Could not fetch %s", name);
 833                         result = 1;
 834                 }
 835         }
 836
 837         return result;
 838 }
 839
 840 static int fetch_one(struct remote *remote, int argc, const char **argv)
 841 {
 842         int i;
 843         static const char **refs = NULL;
 844         int ref_nr = 0;
 845         int exit_code;
 846
 847         if (!remote)
 848                 die("Where do you want to fetch from today?");
 849
 850         transport = transport_get(remote, NULL);
 851         transport_set_verbosity(transport, verbosity, progress);
 852         if (upload_pack)
 853                 set_option(TRANS_OPT_UPLOADPACK, upload_pack);
 854         if (keep)
 855                 set_option(TRANS_OPT_KEEP, "yes");
 856         if (depth)
 857                 set_option(TRANS_OPT_DEPTH, depth);
 858
 859         if (argc > 0) {
 860                 int j = 0;
 861                 refs = xcalloc(argc + 1, sizeof(const char *));
 862                 for (i = 0; i < argc; i++) {
 863                         if (!strcmp(argv[i], "tag")) {
 864                                 char *ref;
 865                                 i++;
 866                                 if (i >= argc)
 867                                         die("You need to specify a tag name.");
 868                                 ref = xmalloc(strlen(argv[i]) * 2 + 22);
 869                                 strcpy(ref, "refs/tags/");
 870                                 strcat(ref, argv[i]);
 871                                 strcat(ref, ":refs/tags/");
 872                                 strcat(ref, argv[i]);
 873                                 refs[j++] = ref;
 874                         } else
 875                                 refs[j++] = argv[i];
 876                 }
 877                 refs[j] = NULL;
 878                 ref_nr = j;
 879         }
 880
 881         sigchain_push_common(unlock_pack_on_signal);
 882         atexit(unlock_pack);
 883         exit_code = do_fetch(transport,
 884                         parse_fetch_refspec(ref_nr, refs), ref_nr);
 885         transport_disconnect(transport);
 886         transport = NULL;
 887         return exit_code;
 888 }
 889
 890 int cmd_fetch(int argc, const char **argv, const char *prefix)
 891 {
 892         int i;
 893         struct string_list list = { NULL, 0, 0, 0 };
 894         struct remote *remote;
 895         int result = 0;
 896
 897         /* Record the command line for the reflog */
 898         strbuf_addstr(&default_rla, "fetch");
 899         for (i = 1; i < argc; i++)
 900                 strbuf_addf(&default_rla, " %s", argv[i]);
 901
 902         argc = parse_options(argc, argv, prefix,
 903                              builtin_fetch_options, builtin_fetch_usage, 0);
 904
 905         if (all) {
 906                 if (argc == 1)
 907                         die("fetch --all does not take a repository argument");
 908                 else if (argc > 1)
 909                         die("fetch --all does not make sense with refspecs");
 910                 (void) for_each_remote(get_one_remote_for_fetch, &list);
 911                 result = fetch_multiple(&list);
 912         } else if (argc == 0) {
 913                 /* No arguments -- use default remote */
 914                 remote = remote_get(NULL);
 915                 result = fetch_one(remote, argc, argv);
 916         } else if (multiple) {
 917                 /* All arguments are assumed to be remotes or groups */
 918                 for (i = 0; i < argc; i++)
 919                         if (!add_remote_or_group(argv[i], &list))
 920                                 die("No such remote or remote group: %s", argv[i]);
 921                 result = fetch_multiple(&list);
 922         } else {
 923                 /* Single remote or group */
 924                 (void) add_remote_or_group(argv[0], &list);
 925                 if (list.nr > 1) {
 926                         /* More than one remote */
 927                         if (argc > 1)
 928                                 die("Fetching a group and specifying refspecs does not make sense");
 929                         result = fetch_multiple(&list);
 930                 } else {
 931                         /* Zero or one remotes */
 932                         remote = remote_get(argv[0]);
 933                         result = fetch_one(remote, argc-1, argv+1);
 934                 }
 935         }
 936
 937         /* All names were strdup()ed or strndup()ed */
 938         list.strdup_strings = 1;
 939         string_list_clear(&list, 0);
 940
 941         return result;
 942 }