git.oblomov.eu Git - git/blob - 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 #include "submodule.h"
  16
  17 static const char * const builtin_fetch_usage[] = {
  18         "git fetch [<options>] [<repository> [<refspec>...]]",
  19         "git fetch [<options>] <group>",
  20         "git fetch --multiple [<options>] [(<repository> | <group>)...]",
  21         "git fetch --all [<options>]",
  22         NULL
  23 };
  24
  25 enum {
  26         TAGS_UNSET = 0,
  27         TAGS_DEFAULT = 1,
  28         TAGS_SET = 2
  29 };
  30
  31 static int all, append, dry_run, force, keep, multiple, prune, update_head_ok, verbosity;
  32 static int progress, recurse_submodules = RECURSE_SUBMODULES_DEFAULT;
  33 static int tags = TAGS_DEFAULT;
  34 static const char *depth;
  35 static const char *upload_pack;
  36 static struct strbuf default_rla = STRBUF_INIT;
  37 static struct transport *transport;
  38 static const char *submodule_prefix = "";
  39 static const char *recurse_submodules_default;
  40
  41 static int option_parse_recurse_submodules(const struct option *opt,
  42                                    const char *arg, int unset)
  43 {
  44         if (unset) {
  45                 recurse_submodules = RECURSE_SUBMODULES_OFF;
  46         } else {
  47                 if (arg)
  48                         recurse_submodules = parse_fetch_recurse_submodules_arg(opt->long_name, arg);
  49                 else
  50                         recurse_submodules = RECURSE_SUBMODULES_ON;
  51         }
  52         return 0;
  53 }
  54
  55 static struct option builtin_fetch_options[] = {
  56         OPT__VERBOSITY(&verbosity),
  57         OPT_BOOLEAN(0, "all", &all,
  58                     "fetch from all remotes"),
  59         OPT_BOOLEAN('a', "append", &append,
  60                     "append to .git/FETCH_HEAD instead of overwriting"),
  61         OPT_STRING(0, "upload-pack", &upload_pack, "path",
  62                    "path to upload pack on remote end"),
  63         OPT__FORCE(&force, "force overwrite of local branch"),
  64         OPT_BOOLEAN('m', "multiple", &multiple,
  65                     "fetch from multiple remotes"),
  66         OPT_SET_INT('t', "tags", &tags,
  67                     "fetch all tags and associated objects", TAGS_SET),
  68         OPT_SET_INT('n', NULL, &tags,
  69                     "do not fetch all tags (--no-tags)", TAGS_UNSET),
  70         OPT_BOOLEAN('p', "prune", &prune,
  71                     "prune remote-tracking branches no longer on remote"),
  72         { OPTION_CALLBACK, 0, "recurse-submodules", NULL, "on-demand",
  73                     "control recursive fetching of submodules",
  74                     PARSE_OPT_OPTARG, option_parse_recurse_submodules },
  75         OPT_BOOLEAN(0, "dry-run", &dry_run,
  76                     "dry run"),
  77         OPT_BOOLEAN('k', "keep", &keep, "keep downloaded pack"),
  78         OPT_BOOLEAN('u', "update-head-ok", &update_head_ok,
  79                     "allow updating of HEAD ref"),
  80         OPT_BOOLEAN(0, "progress", &progress, "force progress reporting"),
  81         OPT_STRING(0, "depth", &depth, "depth",
  82                    "deepen history of shallow clone"),
  83         { OPTION_STRING, 0, "submodule-prefix", &submodule_prefix, "dir",
  84                    "prepend this to submodule path output", PARSE_OPT_HIDDEN },
  85         { OPTION_STRING, 0, "recurse-submodules-default",
  86                    &recurse_submodules_default, NULL,
  87                    "default mode for recursion", PARSE_OPT_HIDDEN },
  88         OPT_END()
  89 };
  90
  91 static void unlock_pack(void)
  92 {
  93         if (transport)
  94                 transport_unlock_pack(transport);
  95 }
  96
  97 static void unlock_pack_on_signal(int signo)
  98 {
  99         unlock_pack();
 100         sigchain_pop(signo);
 101         raise(signo);
 102 }
 103
 104 static void add_merge_config(struct ref **head,
 105                            const struct ref *remote_refs,
 106                            struct branch *branch,
 107                            struct ref ***tail)
 108 {
 109         int i;
 110
 111         for (i = 0; i < branch->merge_nr; i++) {
 112                 struct ref *rm, **old_tail = *tail;
 113                 struct refspec refspec;
 114
 115                 for (rm = *head; rm; rm = rm->next) {
 116                         if (branch_merge_matches(branch, i, rm->name)) {
 117                                 rm->merge = 1;
 118                                 break;
 119                         }
 120                 }
 121                 if (rm)
 122                         continue;
 123
 124                 /*
 125                  * Not fetched to a remote-tracking branch?  We need to fetch
 126                  * it anyway to allow this branch's "branch.$name.merge"
 127                  * to be honored by 'git pull', but we do not have to
 128                  * fail if branch.$name.merge is misconfigured to point
 129                  * at a nonexisting branch.  If we were indeed called by
 130                  * 'git pull', it will notice the misconfiguration because
 131                  * there is no entry in the resulting FETCH_HEAD marked
 132                  * for merging.
 133                  */
 134                 memset(&refspec, 0, sizeof(refspec));
 135                 refspec.src = branch->merge[i]->src;
 136                 get_fetch_map(remote_refs, &refspec, tail, 1);
 137                 for (rm = *old_tail; rm; rm = rm->next)
 138                         rm->merge = 1;
 139         }
 140 }
 141
 142 static void find_non_local_tags(struct transport *transport,
 143                         struct ref **head,
 144                         struct ref ***tail);
 145
 146 static struct ref *get_ref_map(struct transport *transport,
 147                                struct refspec *refs, int ref_count, int tags,
 148                                int *autotags)
 149 {
 150         int i;
 151         struct ref *rm;
 152         struct ref *ref_map = NULL;
 153         struct ref **tail = &ref_map;
 154
 155         const struct ref *remote_refs = transport_get_remote_refs(transport);
 156
 157         if (ref_count || tags == TAGS_SET) {
 158                 for (i = 0; i < ref_count; i++) {
 159                         get_fetch_map(remote_refs, &refs[i], &tail, 0);
 160                         if (refs[i].dst && refs[i].dst[0])
 161                                 *autotags = 1;
 162                 }
 163                 /* Merge everything on the command line, but not --tags */
 164                 for (rm = ref_map; rm; rm = rm->next)
 165                         rm->merge = 1;
 166                 if (tags == TAGS_SET)
 167                         get_fetch_map(remote_refs, tag_refspec, &tail, 0);
 168         } else {
 169                 /* Use the defaults */
 170                 struct remote *remote = transport->remote;
 171                 struct branch *branch = branch_get(NULL);
 172                 int has_merge = branch_has_merge_config(branch);
 173                 if (remote &&
 174                     (remote->fetch_refspec_nr ||
 175                      /* Note: has_merge implies non-NULL branch->remote_name */
 176                      (has_merge && !strcmp(branch->remote_name, remote->name)))) {
 177                         for (i = 0; i < remote->fetch_refspec_nr; i++) {
 178                                 get_fetch_map(remote_refs, &remote->fetch[i], &tail, 0);
 179                                 if (remote->fetch[i].dst &&
 180                                     remote->fetch[i].dst[0])
 181                                         *autotags = 1;
 182                                 if (!i && !has_merge && ref_map &&
 183                                     !remote->fetch[0].pattern)
 184                                         ref_map->merge = 1;
 185                         }
 186                         /*
 187                          * if the remote we're fetching from is the same
 188                          * as given in branch.<name>.remote, we add the
 189                          * ref given in branch.<name>.merge, too.
 190                          *
 191                          * Note: has_merge implies non-NULL branch->remote_name
 192                          */
 193                         if (has_merge &&
 194                             !strcmp(branch->remote_name, remote->name))
 195                                 add_merge_config(&ref_map, remote_refs, branch, &tail);
 196                 } else {
 197                         ref_map = get_remote_ref(remote_refs, "HEAD");
 198                         if (!ref_map)
 199                                 die(_("Couldn't find remote ref HEAD"));
 200                         ref_map->merge = 1;
 201                         tail = &ref_map->next;
 202                 }
 203         }
 204         if (tags == TAGS_DEFAULT && *autotags)
 205                 find_non_local_tags(transport, &ref_map, &tail);
 206         ref_remove_duplicates(ref_map);
 207
 208         return ref_map;
 209 }
 210
 211 #define STORE_REF_ERROR_OTHER 1
 212 #define STORE_REF_ERROR_DF_CONFLICT 2
 213
 214 static int s_update_ref(const char *action,
 215                         struct ref *ref,
 216                         int check_old)
 217 {
 218         char msg[1024];
 219         char *rla = getenv("GIT_REFLOG_ACTION");
 220         static struct ref_lock *lock;
 221
 222         if (dry_run)
 223                 return 0;
 224         if (!rla)
 225                 rla = default_rla.buf;
 226         snprintf(msg, sizeof(msg), "%s: %s", rla, action);
 227         lock = lock_any_ref_for_update(ref->name,
 228                                        check_old ? ref->old_sha1 : NULL, 0);
 229         if (!lock)
 230                 return errno == ENOTDIR ? STORE_REF_ERROR_DF_CONFLICT :
 231                                           STORE_REF_ERROR_OTHER;
 232         if (write_ref_sha1(lock, ref->new_sha1, msg) < 0)
 233                 return errno == ENOTDIR ? STORE_REF_ERROR_DF_CONFLICT :
 234                                           STORE_REF_ERROR_OTHER;
 235         return 0;
 236 }
 237
 238 #define REFCOL_WIDTH  10
 239
 240 static int update_local_ref(struct ref *ref,
 241                             const char *remote,
 242                             char *display)
 243 {
 244         struct commit *current = NULL, *updated;
 245         enum object_type type;
 246         struct branch *current_branch = branch_get(NULL);
 247         const char *pretty_ref = prettify_refname(ref->name);
 248
 249         *display = 0;
 250         type = sha1_object_info(ref->new_sha1, NULL);
 251         if (type < 0)
 252                 die(_("object %s not found"), sha1_to_hex(ref->new_sha1));
 253
 254         if (!hashcmp(ref->old_sha1, ref->new_sha1)) {
 255                 if (verbosity > 0)
 256                         sprintf(display, "= %-*s %-*s -> %s", TRANSPORT_SUMMARY_WIDTH,
 257                                 _("[up to date]"), REFCOL_WIDTH, remote,
 258                                 pretty_ref);
 259                 return 0;
 260         }
 261
 262         if (current_branch &&
 263             !strcmp(ref->name, current_branch->name) &&
 264             !(update_head_ok || is_bare_repository()) &&
 265             !is_null_sha1(ref->old_sha1)) {
 266                 /*
 267                  * If this is the head, and it's not okay to update
 268                  * the head, and the old value of the head isn't empty...
 269                  */
 270                 sprintf(display, _("! %-*s %-*s -> %s  (can't fetch in current branch)"),
 271                         TRANSPORT_SUMMARY_WIDTH, _("[rejected]"), REFCOL_WIDTH, remote,
 272                         pretty_ref);
 273                 return 1;
 274         }
 275
 276         if (!is_null_sha1(ref->old_sha1) &&
 277             !prefixcmp(ref->name, "refs/tags/")) {
 278                 int r;
 279                 r = s_update_ref("updating tag", ref, 0);
 280                 sprintf(display, "%c %-*s %-*s -> %s%s", r ? '!' : '-',
 281                         TRANSPORT_SUMMARY_WIDTH, _("[tag update]"), REFCOL_WIDTH, remote,
 282                         pretty_ref, r ? _("  (unable to update local ref)") : "");
 283                 return r;
 284         }
 285
 286         current = lookup_commit_reference_gently(ref->old_sha1, 1);
 287         updated = lookup_commit_reference_gently(ref->new_sha1, 1);
 288         if (!current || !updated) {
 289                 const char *msg;
 290                 const char *what;
 291                 int r;
 292                 if (!strncmp(ref->name, "refs/tags/", 10)) {
 293                         msg = "storing tag";
 294                         what = _("[new tag]");
 295                 }
 296                 else {
 297                         msg = "storing head";
 298                         what = _("[new branch]");
 299                         if ((recurse_submodules != RECURSE_SUBMODULES_OFF) &&
 300                             (recurse_submodules != RECURSE_SUBMODULES_ON))
 301                                 check_for_new_submodule_commits(ref->new_sha1);
 302                 }
 303
 304                 r = s_update_ref(msg, ref, 0);
 305                 sprintf(display, "%c %-*s %-*s -> %s%s", r ? '!' : '*',
 306                         TRANSPORT_SUMMARY_WIDTH, what, REFCOL_WIDTH, remote, pretty_ref,
 307                         r ? _("  (unable to update local ref)") : "");
 308                 return r;
 309         }
 310
 311         if (in_merge_bases(current, &updated, 1)) {
 312                 char quickref[83];
 313                 int r;
 314                 strcpy(quickref, find_unique_abbrev(current->object.sha1, DEFAULT_ABBREV));
 315                 strcat(quickref, "..");
 316                 strcat(quickref, find_unique_abbrev(ref->new_sha1, DEFAULT_ABBREV));
 317                 if ((recurse_submodules != RECURSE_SUBMODULES_OFF) &&
 318                     (recurse_submodules != RECURSE_SUBMODULES_ON))
 319                         check_for_new_submodule_commits(ref->new_sha1);
 320                 r = s_update_ref("fast-forward", ref, 1);
 321                 sprintf(display, "%c %-*s %-*s -> %s%s", r ? '!' : ' ',
 322                         TRANSPORT_SUMMARY_WIDTH, quickref, REFCOL_WIDTH, remote,
 323                         pretty_ref, r ? _("  (unable to update local ref)") : "");
 324                 return r;
 325         } else if (force || ref->force) {
 326                 char quickref[84];
 327                 int r;
 328                 strcpy(quickref, find_unique_abbrev(current->object.sha1, DEFAULT_ABBREV));
 329                 strcat(quickref, "...");
 330                 strcat(quickref, find_unique_abbrev(ref->new_sha1, DEFAULT_ABBREV));
 331                 if ((recurse_submodules != RECURSE_SUBMODULES_OFF) &&
 332                     (recurse_submodules != RECURSE_SUBMODULES_ON))
 333                         check_for_new_submodule_commits(ref->new_sha1);
 334                 r = s_update_ref("forced-update", ref, 1);
 335                 sprintf(display, "%c %-*s %-*s -> %s  (%s)", r ? '!' : '+',
 336                         TRANSPORT_SUMMARY_WIDTH, quickref, REFCOL_WIDTH, remote,
 337                         pretty_ref,
 338                         r ? _("unable to update local ref") : _("forced update"));
 339                 return r;
 340         } else {
 341                 sprintf(display, "! %-*s %-*s -> %s  %s",
 342                         TRANSPORT_SUMMARY_WIDTH, _("[rejected]"), REFCOL_WIDTH, remote,
 343                         pretty_ref, _("(non-fast-forward)"));
 344                 return 1;
 345         }
 346 }
 347
 348 /*
 349  * Take callback data, and return next object name in the buffer.
 350  * When called after returning the name for the last object, return -1
 351  * to signal EOF, otherwise return 0.
 352  */
 353 typedef int (*sha1_iterate_fn)(void *, unsigned char [20]);
 354
 355 /*
 356  * If we feed all the commits we want to verify to this command
 357  *
 358  *  $ git rev-list --verify-objects --stdin --not --all
 359  *
 360  * and if it does not error out, that means everything reachable from
 361  * these commits locally exists and is connected to some of our
 362  * existing refs.
 363  *
 364  * Returns 0 if everything is connected, non-zero otherwise.
 365  */
 366 static int check_everything_connected(sha1_iterate_fn fn, int quiet, void *cb_data)
 367 {
 368         struct child_process rev_list;
 369         const char *argv[] = {"rev-list", "--verify-objects",
 370                               "--stdin", "--not", "--all", NULL, NULL};
 371         char commit[41];
 372         unsigned char sha1[20];
 373         int err = 0;
 374
 375         if (fn(cb_data, sha1))
 376                 return err;
 377
 378         if (quiet)
 379                 argv[5] = "--quiet";
 380
 381         memset(&rev_list, 0, sizeof(rev_list));
 382         rev_list.argv = argv;
 383         rev_list.git_cmd = 1;
 384         rev_list.in = -1;
 385         rev_list.no_stdout = 1;
 386         rev_list.no_stderr = quiet;
 387         if (start_command(&rev_list))
 388                 return error(_("Could not run 'git rev-list'"));
 389
 390         sigchain_push(SIGPIPE, SIG_IGN);
 391
 392         commit[40] = '\n';
 393         do {
 394                 memcpy(commit, sha1_to_hex(sha1), 40);
 395                 if (write_in_full(rev_list.in, commit, 41) < 0) {
 396                         if (errno != EPIPE && errno != EINVAL)
 397                                 error(_("failed write to rev-list: %s"),
 398                                       strerror(errno));
 399                         err = -1;
 400                         break;
 401                 }
 402         } while (!fn(cb_data, sha1));
 403
 404         if (close(rev_list.in)) {
 405                 error(_("failed to close rev-list's stdin: %s"), strerror(errno));
 406                 err = -1;
 407         }
 408
 409         sigchain_pop(SIGPIPE);
 410         return finish_command(&rev_list) || err;
 411 }
 412
 413 static int iterate_ref_map(void *cb_data, unsigned char sha1[20])
 414 {
 415         struct ref **rm = cb_data;
 416         struct ref *ref = *rm;
 417
 418         if (!ref)
 419                 return -1; /* end of the list */
 420         *rm = ref->next;
 421         hashcpy(sha1, ref->old_sha1);
 422         return 0;
 423 }
 424
 425 static int store_updated_refs(const char *raw_url, const char *remote_name,
 426                 struct ref *ref_map)
 427 {
 428         FILE *fp;
 429         struct commit *commit;
 430         int url_len, i, note_len, shown_url = 0, rc = 0;
 431         char note[1024];
 432         const char *what, *kind;
 433         struct ref *rm;
 434         char *url, *filename = dry_run ? "/dev/null" : git_path("FETCH_HEAD");
 435
 436         fp = fopen(filename, "a");
 437         if (!fp)
 438                 return error(_("cannot open %s: %s\n"), filename, strerror(errno));
 439
 440         if (raw_url)
 441                 url = transport_anonymize_url(raw_url);
 442         else
 443                 url = xstrdup("foreign");
 444
 445         rm = ref_map;
 446         if (check_everything_connected(iterate_ref_map, 0, &rm))
 447                 return error(_("%s did not send all necessary objects\n"), url);
 448
 449         for (rm = ref_map; rm; rm = rm->next) {
 450                 struct ref *ref = NULL;
 451
 452                 if (rm->peer_ref) {
 453                         ref = xcalloc(1, sizeof(*ref) + strlen(rm->peer_ref->name) + 1);
 454                         strcpy(ref->name, rm->peer_ref->name);
 455                         hashcpy(ref->old_sha1, rm->peer_ref->old_sha1);
 456                         hashcpy(ref->new_sha1, rm->old_sha1);
 457                         ref->force = rm->peer_ref->force;
 458                 }
 459
 460                 commit = lookup_commit_reference_gently(rm->old_sha1, 1);
 461                 if (!commit)
 462                         rm->merge = 0;
 463
 464                 if (!strcmp(rm->name, "HEAD")) {
 465                         kind = "";
 466                         what = "";
 467                 }
 468                 else if (!prefixcmp(rm->name, "refs/heads/")) {
 469                         kind = "branch";
 470                         what = rm->name + 11;
 471                 }
 472                 else if (!prefixcmp(rm->name, "refs/tags/")) {
 473                         kind = "tag";
 474                         what = rm->name + 10;
 475                 }
 476                 else if (!prefixcmp(rm->name, "refs/remotes/")) {
 477                         kind = "remote-tracking branch";
 478                         what = rm->name + 13;
 479                 }
 480                 else {
 481                         kind = "";
 482                         what = rm->name;
 483                 }
 484
 485                 url_len = strlen(url);
 486                 for (i = url_len - 1; url[i] == '/' && 0 <= i; i--)
 487                         ;
 488                 url_len = i + 1;
 489                 if (4 < i && !strncmp(".git", url + i - 3, 4))
 490                         url_len = i - 3;
 491
 492                 note_len = 0;
 493                 if (*what) {
 494                         if (*kind)
 495                                 note_len += sprintf(note + note_len, "%s ",
 496                                                     kind);
 497                         note_len += sprintf(note + note_len, "'%s' of ", what);
 498                 }
 499                 note[note_len] = '\0';
 500                 fprintf(fp, "%s\t%s\t%s",
 501                         sha1_to_hex(commit ? commit->object.sha1 :
 502                                     rm->old_sha1),
 503                         rm->merge ? "" : "not-for-merge",
 504                         note);
 505                 for (i = 0; i < url_len; ++i)
 506                         if ('\n' == url[i])
 507                                 fputs("\\n", fp);
 508                         else
 509                                 fputc(url[i], fp);
 510                 fputc('\n', fp);
 511
 512                 if (ref) {
 513                         rc |= update_local_ref(ref, what, note);
 514                         free(ref);
 515                 } else
 516                         sprintf(note, "* %-*s %-*s -> FETCH_HEAD",
 517                                 TRANSPORT_SUMMARY_WIDTH, *kind ? kind : "branch",
 518                                  REFCOL_WIDTH, *what ? what : "HEAD");
 519                 if (*note) {
 520                         if (verbosity >= 0 && !shown_url) {
 521                                 fprintf(stderr, _("From %.*s\n"),
 522                                                 url_len, url);
 523                                 shown_url = 1;
 524                         }
 525                         if (verbosity >= 0)
 526                                 fprintf(stderr, " %s\n", note);
 527                 }
 528         }
 529         free(url);
 530         fclose(fp);
 531         if (rc & STORE_REF_ERROR_DF_CONFLICT)
 532                 error(_("some local refs could not be updated; try running\n"
 533                       " 'git remote prune %s' to remove any old, conflicting "
 534                       "branches"), remote_name);
 535         return rc;
 536 }
 537
 538 /*
 539  * We would want to bypass the object transfer altogether if
 540  * everything we are going to fetch already exists and is connected
 541  * locally.
 542  */
 543 static int quickfetch(struct ref *ref_map)
 544 {
 545         struct ref *rm = ref_map;
 546
 547         /*
 548          * If we are deepening a shallow clone we already have these
 549          * objects reachable.  Running rev-list here will return with
 550          * a good (0) exit status and we'll bypass the fetch that we
 551          * really need to perform.  Claiming failure now will ensure
 552          * we perform the network exchange to deepen our history.
 553          */
 554         if (depth)
 555                 return -1;
 556         return check_everything_connected(iterate_ref_map, 1, &rm);
 557 }
 558
 559 static int fetch_refs(struct transport *transport, struct ref *ref_map)
 560 {
 561         int ret = quickfetch(ref_map);
 562         if (ret)
 563                 ret = transport_fetch_refs(transport, ref_map);
 564         if (!ret)
 565                 ret |= store_updated_refs(transport->url,
 566                                 transport->remote->name,
 567                                 ref_map);
 568         transport_unlock_pack(transport);
 569         return ret;
 570 }
 571
 572 static int prune_refs(struct transport *transport, struct ref *ref_map)
 573 {
 574         int result = 0;
 575         struct ref *ref, *stale_refs = get_stale_heads(transport->remote, ref_map);
 576         const char *dangling_msg = dry_run
 577                 ? _("   (%s will become dangling)\n")
 578                 : _("   (%s has become dangling)\n");
 579
 580         for (ref = stale_refs; ref; ref = ref->next) {
 581                 if (!dry_run)
 582                         result |= delete_ref(ref->name, NULL, 0);
 583                 if (verbosity >= 0) {
 584                         fprintf(stderr, " x %-*s %-*s -> %s\n",
 585                                 TRANSPORT_SUMMARY_WIDTH, _("[deleted]"),
 586                                 REFCOL_WIDTH, _("(none)"), prettify_refname(ref->name));
 587                         warn_dangling_symref(stderr, dangling_msg, ref->name);
 588                 }
 589         }
 590         free_refs(stale_refs);
 591         return result;
 592 }
 593
 594 static int add_existing(const char *refname, const unsigned char *sha1,
 595                         int flag, void *cbdata)
 596 {
 597         struct string_list *list = (struct string_list *)cbdata;
 598         struct string_list_item *item = string_list_insert(list, refname);
 599         item->util = (void *)sha1;
 600         return 0;
 601 }
 602
 603 static int will_fetch(struct ref **head, const unsigned char *sha1)
 604 {
 605         struct ref *rm = *head;
 606         while (rm) {
 607                 if (!hashcmp(rm->old_sha1, sha1))
 608                         return 1;
 609                 rm = rm->next;
 610         }
 611         return 0;
 612 }
 613
 614 static void find_non_local_tags(struct transport *transport,
 615                         struct ref **head,
 616                         struct ref ***tail)
 617 {
 618         struct string_list existing_refs = STRING_LIST_INIT_NODUP;
 619         struct string_list remote_refs = STRING_LIST_INIT_NODUP;
 620         const struct ref *ref;
 621         struct string_list_item *item = NULL;
 622
 623         for_each_ref(add_existing, &existing_refs);
 624         for (ref = transport_get_remote_refs(transport); ref; ref = ref->next) {
 625                 if (prefixcmp(ref->name, "refs/tags"))
 626                         continue;
 627
 628                 /*
 629                  * The peeled ref always follows the matching base
 630                  * ref, so if we see a peeled ref that we don't want
 631                  * to fetch then we can mark the ref entry in the list
 632                  * as one to ignore by setting util to NULL.
 633                  */
 634                 if (!suffixcmp(ref->name, "^{}")) {
 635                         if (item && !has_sha1_file(ref->old_sha1) &&
 636                             !will_fetch(head, ref->old_sha1) &&
 637                             !has_sha1_file(item->util) &&
 638                             !will_fetch(head, item->util))
 639                                 item->util = NULL;
 640                         item = NULL;
 641                         continue;
 642                 }
 643
 644                 /*
 645                  * If item is non-NULL here, then we previously saw a
 646                  * ref not followed by a peeled reference, so we need
 647                  * to check if it is a lightweight tag that we want to
 648                  * fetch.
 649                  */
 650                 if (item && !has_sha1_file(item->util) &&
 651                     !will_fetch(head, item->util))
 652                         item->util = NULL;
 653
 654                 item = NULL;
 655
 656                 /* skip duplicates and refs that we already have */
 657                 if (string_list_has_string(&remote_refs, ref->name) ||
 658                     string_list_has_string(&existing_refs, ref->name))
 659                         continue;
 660
 661                 item = string_list_insert(&remote_refs, ref->name);
 662                 item->util = (void *)ref->old_sha1;
 663         }
 664         string_list_clear(&existing_refs, 0);
 665
 666         /*
 667          * We may have a final lightweight tag that needs to be
 668          * checked to see if it needs fetching.
 669          */
 670         if (item && !has_sha1_file(item->util) &&
 671             !will_fetch(head, item->util))
 672                 item->util = NULL;
 673
 674         /*
 675          * For all the tags in the remote_refs string list,
 676          * add them to the list of refs to be fetched
 677          */
 678         for_each_string_list_item(item, &remote_refs) {
 679                 /* Unless we have already decided to ignore this item... */
 680                 if (item->util)
 681                 {
 682                         struct ref *rm = alloc_ref(item->string);
 683                         rm->peer_ref = alloc_ref(item->string);
 684                         hashcpy(rm->old_sha1, item->util);
 685                         **tail = rm;
 686                         *tail = &rm->next;
 687                 }
 688         }
 689
 690         string_list_clear(&remote_refs, 0);
 691 }
 692
 693 static void check_not_current_branch(struct ref *ref_map)
 694 {
 695         struct branch *current_branch = branch_get(NULL);
 696
 697         if (is_bare_repository() || !current_branch)
 698                 return;
 699
 700         for (; ref_map; ref_map = ref_map->next)
 701                 if (ref_map->peer_ref && !strcmp(current_branch->refname,
 702                                         ref_map->peer_ref->name))
 703                         die(_("Refusing to fetch into current branch %s "
 704                             "of non-bare repository"), current_branch->refname);
 705 }
 706
 707 static int truncate_fetch_head(void)
 708 {
 709         char *filename = git_path("FETCH_HEAD");
 710         FILE *fp = fopen(filename, "w");
 711
 712         if (!fp)
 713                 return error(_("cannot open %s: %s\n"), filename, strerror(errno));
 714         fclose(fp);
 715         return 0;
 716 }
 717
 718 static int do_fetch(struct transport *transport,
 719                     struct refspec *refs, int ref_count)
 720 {
 721         struct string_list existing_refs = STRING_LIST_INIT_NODUP;
 722         struct string_list_item *peer_item = NULL;
 723         struct ref *ref_map;
 724         struct ref *rm;
 725         int autotags = (transport->remote->fetch_tags == 1);
 726
 727         for_each_ref(add_existing, &existing_refs);
 728
 729         if (tags == TAGS_DEFAULT) {
 730                 if (transport->remote->fetch_tags == 2)
 731                         tags = TAGS_SET;
 732                 if (transport->remote->fetch_tags == -1)
 733                         tags = TAGS_UNSET;
 734         }
 735
 736         if (!transport->get_refs_list || !transport->fetch)
 737                 die(_("Don't know how to fetch from %s"), transport->url);
 738
 739         /* if not appending, truncate FETCH_HEAD */
 740         if (!append && !dry_run) {
 741                 int errcode = truncate_fetch_head();
 742                 if (errcode)
 743                         return errcode;
 744         }
 745
 746         ref_map = get_ref_map(transport, refs, ref_count, tags, &autotags);
 747         if (!update_head_ok)
 748                 check_not_current_branch(ref_map);
 749
 750         for (rm = ref_map; rm; rm = rm->next) {
 751                 if (rm->peer_ref) {
 752                         peer_item = string_list_lookup(&existing_refs,
 753                                                        rm->peer_ref->name);
 754                         if (peer_item)
 755                                 hashcpy(rm->peer_ref->old_sha1,
 756                                         peer_item->util);
 757                 }
 758         }
 759
 760         if (tags == TAGS_DEFAULT && autotags)
 761                 transport_set_option(transport, TRANS_OPT_FOLLOWTAGS, "1");
 762         if (fetch_refs(transport, ref_map)) {
 763                 free_refs(ref_map);
 764                 return 1;
 765         }
 766         if (prune)
 767                 prune_refs(transport, ref_map);
 768         free_refs(ref_map);
 769
 770         /* if neither --no-tags nor --tags was specified, do automated tag
 771          * following ... */
 772         if (tags == TAGS_DEFAULT && autotags) {
 773                 struct ref **tail = &ref_map;
 774                 ref_map = NULL;
 775                 find_non_local_tags(transport, &ref_map, &tail);
 776                 if (ref_map) {
 777                         transport_set_option(transport, TRANS_OPT_FOLLOWTAGS, NULL);
 778                         transport_set_option(transport, TRANS_OPT_DEPTH, "0");
 779                         fetch_refs(transport, ref_map);
 780                 }
 781                 free_refs(ref_map);
 782         }
 783
 784         return 0;
 785 }
 786
 787 static void set_option(const char *name, const char *value)
 788 {
 789         int r = transport_set_option(transport, name, value);
 790         if (r < 0)
 791                 die(_("Option \"%s\" value \"%s\" is not valid for %s"),
 792                         name, value, transport->url);
 793         if (r > 0)
 794                 warning(_("Option \"%s\" is ignored for %s\n"),
 795                         name, transport->url);
 796 }
 797
 798 static int get_one_remote_for_fetch(struct remote *remote, void *priv)
 799 {
 800         struct string_list *list = priv;
 801         if (!remote->skip_default_update)
 802                 string_list_append(list, remote->name);
 803         return 0;
 804 }
 805
 806 struct remote_group_data {
 807         const char *name;
 808         struct string_list *list;
 809 };
 810
 811 static int get_remote_group(const char *key, const char *value, void *priv)
 812 {
 813         struct remote_group_data *g = priv;
 814
 815         if (!prefixcmp(key, "remotes.") &&
 816                         !strcmp(key + 8, g->name)) {
 817                 /* split list by white space */
 818                 int space = strcspn(value, " \t\n");
 819                 while (*value) {
 820                         if (space > 1) {
 821                                 string_list_append(g->list,
 822                                                    xstrndup(value, space));
 823                         }
 824                         value += space + (value[space] != '\0');
 825                         space = strcspn(value, " \t\n");
 826                 }
 827         }
 828
 829         return 0;
 830 }
 831
 832 static int add_remote_or_group(const char *name, struct string_list *list)
 833 {
 834         int prev_nr = list->nr;
 835         struct remote_group_data g;
 836         g.name = name; g.list = list;
 837
 838         git_config(get_remote_group, &g);
 839         if (list->nr == prev_nr) {
 840                 struct remote *remote;
 841                 if (!remote_is_configured(name))
 842                         return 0;
 843                 remote = remote_get(name);
 844                 string_list_append(list, remote->name);
 845         }
 846         return 1;
 847 }
 848
 849 static void add_options_to_argv(int *argc, const char **argv)
 850 {
 851         if (dry_run)
 852                 argv[(*argc)++] = "--dry-run";
 853         if (prune)
 854                 argv[(*argc)++] = "--prune";
 855         if (update_head_ok)
 856                 argv[(*argc)++] = "--update-head-ok";
 857         if (force)
 858                 argv[(*argc)++] = "--force";
 859         if (keep)
 860                 argv[(*argc)++] = "--keep";
 861         if (recurse_submodules == RECURSE_SUBMODULES_ON)
 862                 argv[(*argc)++] = "--recurse-submodules";
 863         else if (recurse_submodules == RECURSE_SUBMODULES_ON_DEMAND)
 864                 argv[(*argc)++] = "--recurse-submodules=on-demand";
 865         if (verbosity >= 2)
 866                 argv[(*argc)++] = "-v";
 867         if (verbosity >= 1)
 868                 argv[(*argc)++] = "-v";
 869         else if (verbosity < 0)
 870                 argv[(*argc)++] = "-q";
 871
 872 }
 873
 874 static int fetch_multiple(struct string_list *list)
 875 {
 876         int i, result = 0;
 877         const char *argv[12] = { "fetch", "--append" };
 878         int argc = 2;
 879
 880         add_options_to_argv(&argc, argv);
 881
 882         if (!append && !dry_run) {
 883                 int errcode = truncate_fetch_head();
 884                 if (errcode)
 885                         return errcode;
 886         }
 887
 888         for (i = 0; i < list->nr; i++) {
 889                 const char *name = list->items[i].string;
 890                 argv[argc] = name;
 891                 argv[argc + 1] = NULL;
 892                 if (verbosity >= 0)
 893                         printf(_("Fetching %s\n"), name);
 894                 if (run_command_v_opt(argv, RUN_GIT_CMD)) {
 895                         error(_("Could not fetch %s"), name);
 896                         result = 1;
 897                 }
 898         }
 899
 900         return result;
 901 }
 902
 903 static int fetch_one(struct remote *remote, int argc, const char **argv)
 904 {
 905         int i;
 906         static const char **refs = NULL;
 907         int ref_nr = 0;
 908         int exit_code;
 909
 910         if (!remote)
 911                 die(_("No remote repository specified.  Please, specify either a URL or a\n"
 912                     "remote name from which new revisions should be fetched."));
 913
 914         transport = transport_get(remote, NULL);
 915         transport_set_verbosity(transport, verbosity, progress);
 916         if (upload_pack)
 917                 set_option(TRANS_OPT_UPLOADPACK, upload_pack);
 918         if (keep)
 919                 set_option(TRANS_OPT_KEEP, "yes");
 920         if (depth)
 921                 set_option(TRANS_OPT_DEPTH, depth);
 922
 923         if (argc > 0) {
 924                 int j = 0;
 925                 refs = xcalloc(argc + 1, sizeof(const char *));
 926                 for (i = 0; i < argc; i++) {
 927                         if (!strcmp(argv[i], "tag")) {
 928                                 char *ref;
 929                                 i++;
 930                                 if (i >= argc)
 931                                         die(_("You need to specify a tag name."));
 932                                 ref = xmalloc(strlen(argv[i]) * 2 + 22);
 933                                 strcpy(ref, "refs/tags/");
 934                                 strcat(ref, argv[i]);
 935                                 strcat(ref, ":refs/tags/");
 936                                 strcat(ref, argv[i]);
 937                                 refs[j++] = ref;
 938                         } else
 939                                 refs[j++] = argv[i];
 940                 }
 941                 refs[j] = NULL;
 942                 ref_nr = j;
 943         }
 944
 945         sigchain_push_common(unlock_pack_on_signal);
 946         atexit(unlock_pack);
 947         exit_code = do_fetch(transport,
 948                         parse_fetch_refspec(ref_nr, refs), ref_nr);
 949         transport_disconnect(transport);
 950         transport = NULL;
 951         return exit_code;
 952 }
 953
 954 int cmd_fetch(int argc, const char **argv, const char *prefix)
 955 {
 956         int i;
 957         struct string_list list = STRING_LIST_INIT_NODUP;
 958         struct remote *remote;
 959         int result = 0;
 960
 961         packet_trace_identity("fetch");
 962
 963         /* Record the command line for the reflog */
 964         strbuf_addstr(&default_rla, "fetch");
 965         for (i = 1; i < argc; i++)
 966                 strbuf_addf(&default_rla, " %s", argv[i]);
 967
 968         argc = parse_options(argc, argv, prefix,
 969                              builtin_fetch_options, builtin_fetch_usage, 0);
 970
 971         if (all) {
 972                 if (argc == 1)
 973                         die(_("fetch --all does not take a repository argument"));
 974                 else if (argc > 1)
 975                         die(_("fetch --all does not make sense with refspecs"));
 976                 (void) for_each_remote(get_one_remote_for_fetch, &list);
 977                 result = fetch_multiple(&list);
 978         } else if (argc == 0) {
 979                 /* No arguments -- use default remote */
 980                 remote = remote_get(NULL);
 981                 result = fetch_one(remote, argc, argv);
 982         } else if (multiple) {
 983                 /* All arguments are assumed to be remotes or groups */
 984                 for (i = 0; i < argc; i++)
 985                         if (!add_remote_or_group(argv[i], &list))
 986                                 die(_("No such remote or remote group: %s"), argv[i]);
 987                 result = fetch_multiple(&list);
 988         } else {
 989                 /* Single remote or group */
 990                 (void) add_remote_or_group(argv[0], &list);
 991                 if (list.nr > 1) {
 992                         /* More than one remote */
 993                         if (argc > 1)
 994                                 die(_("Fetching a group and specifying refspecs does not make sense"));
 995                         result = fetch_multiple(&list);
 996                 } else {
 997                         /* Zero or one remotes */
 998                         remote = remote_get(argv[0]);
 999                         result = fetch_one(remote, argc-1, argv+1);
1000                 }
1001         }
1002
1003         if (!result && (recurse_submodules != RECURSE_SUBMODULES_OFF)) {
1004                 const char *options[10];
1005                 int num_options = 0;
1006                 if (recurse_submodules_default) {
1007                         int arg = parse_fetch_recurse_submodules_arg("--recurse-submodules-default", recurse_submodules_default);
1008                         set_config_fetch_recurse_submodules(arg);
1009                 }
1010                 gitmodules_config();
1011                 git_config(submodule_config, NULL);
1012                 add_options_to_argv(&num_options, options);
1013                 result = fetch_populated_submodules(num_options, options,
1014                                                     submodule_prefix,
1015                                                     recurse_submodules,
1016                                                     verbosity < 0);
1017         }
1018
1019         /* All names were strdup()ed or strndup()ed */
1020         list.strdup_strings = 1;
1021         string_list_clear(&list, 0);
1022
1023         return result;
1024 }