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