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 = -1, 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_BOOL(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         int want_merge;
 381
 382         fp = fopen(filename, "a");
 383         if (!fp)
 384                 return error(_("cannot open %s: %s\n"), filename, strerror(errno));
 385
 386         if (raw_url)
 387                 url = transport_anonymize_url(raw_url);
 388         else
 389                 url = xstrdup("foreign");
 390
 391         rm = ref_map;
 392         if (check_everything_connected(iterate_ref_map, 0, &rm)) {
 393                 rc = error(_("%s did not send all necessary objects\n"), url);
 394                 goto abort;
 395         }
 396
 397         /*
 398          * The first pass writes objects to be merged and then the
 399          * second pass writes the rest, in order to allow using
 400          * FETCH_HEAD as a refname to refer to the ref to be merged.
 401          */
 402         for (want_merge = 1; 0 <= want_merge; want_merge--) {
 403                 for (rm = ref_map; rm; rm = rm->next) {
 404                         struct ref *ref = NULL;
 405
 406                         commit = lookup_commit_reference_gently(rm->old_sha1, 1);
 407                         if (!commit)
 408                                 rm->merge = 0;
 409
 410                         if (rm->merge != want_merge)
 411                                 continue;
 412
 413                         if (rm->peer_ref) {
 414                                 ref = xcalloc(1, sizeof(*ref) + strlen(rm->peer_ref->name) + 1);
 415                                 strcpy(ref->name, rm->peer_ref->name);
 416                                 hashcpy(ref->old_sha1, rm->peer_ref->old_sha1);
 417                                 hashcpy(ref->new_sha1, rm->old_sha1);
 418                                 ref->force = rm->peer_ref->force;
 419                         }
 420
 421
 422                         if (!strcmp(rm->name, "HEAD")) {
 423                                 kind = "";
 424                                 what = "";
 425                         }
 426                         else if (!prefixcmp(rm->name, "refs/heads/")) {
 427                                 kind = "branch";
 428                                 what = rm->name + 11;
 429                         }
 430                         else if (!prefixcmp(rm->name, "refs/tags/")) {
 431                                 kind = "tag";
 432                                 what = rm->name + 10;
 433                         }
 434                         else if (!prefixcmp(rm->name, "refs/remotes/")) {
 435                                 kind = "remote-tracking branch";
 436                                 what = rm->name + 13;
 437                         }
 438                         else {
 439                                 kind = "";
 440                                 what = rm->name;
 441                         }
 442
 443                         url_len = strlen(url);
 444                         for (i = url_len - 1; url[i] == '/' && 0 <= i; i--)
 445                                 ;
 446                         url_len = i + 1;
 447                         if (4 < i && !strncmp(".git", url + i - 3, 4))
 448                                 url_len = i - 3;
 449
 450                         strbuf_reset(&note);
 451                         if (*what) {
 452                                 if (*kind)
 453                                         strbuf_addf(&note, "%s ", kind);
 454                                 strbuf_addf(&note, "'%s' of ", what);
 455                         }
 456                         fprintf(fp, "%s\t%s\t%s",
 457                                 sha1_to_hex(rm->old_sha1),
 458                                 rm->merge ? "" : "not-for-merge",
 459                                 note.buf);
 460                         for (i = 0; i < url_len; ++i)
 461                                 if ('\n' == url[i])
 462                                         fputs("\\n", fp);
 463                                 else
 464                                         fputc(url[i], fp);
 465                         fputc('\n', fp);
 466
 467                         strbuf_reset(&note);
 468                         if (ref) {
 469                                 rc |= update_local_ref(ref, what, &note);
 470                                 free(ref);
 471                         } else
 472                                 strbuf_addf(&note, "* %-*s %-*s -> FETCH_HEAD",
 473                                             TRANSPORT_SUMMARY_WIDTH,
 474                                             *kind ? kind : "branch",
 475                                             REFCOL_WIDTH,
 476                                             *what ? what : "HEAD");
 477                         if (note.len) {
 478                                 if (verbosity >= 0 && !shown_url) {
 479                                         fprintf(stderr, _("From %.*s\n"),
 480                                                         url_len, url);
 481                                         shown_url = 1;
 482                                 }
 483                                 if (verbosity >= 0)
 484                                         fprintf(stderr, " %s\n", note.buf);
 485                         }
 486                 }
 487         }
 488
 489         if (rc & STORE_REF_ERROR_DF_CONFLICT)
 490                 error(_("some local refs could not be updated; try running\n"
 491                       " 'git remote prune %s' to remove any old, conflicting "
 492                       "branches"), remote_name);
 493
 494  abort:
 495         strbuf_release(&note);
 496         free(url);
 497         fclose(fp);
 498         return rc;
 499 }
 500
 501 /*
 502  * We would want to bypass the object transfer altogether if
 503  * everything we are going to fetch already exists and is connected
 504  * locally.
 505  */
 506 static int quickfetch(struct ref *ref_map)
 507 {
 508         struct ref *rm = ref_map;
 509
 510         /*
 511          * If we are deepening a shallow clone we already have these
 512          * objects reachable.  Running rev-list here will return with
 513          * a good (0) exit status and we'll bypass the fetch that we
 514          * really need to perform.  Claiming failure now will ensure
 515          * we perform the network exchange to deepen our history.
 516          */
 517         if (depth)
 518                 return -1;
 519         return check_everything_connected(iterate_ref_map, 1, &rm);
 520 }
 521
 522 static int fetch_refs(struct transport *transport, struct ref *ref_map)
 523 {
 524         int ret = quickfetch(ref_map);
 525         if (ret)
 526                 ret = transport_fetch_refs(transport, ref_map);
 527         if (!ret)
 528                 ret |= store_updated_refs(transport->url,
 529                                 transport->remote->name,
 530                                 ref_map);
 531         transport_unlock_pack(transport);
 532         return ret;
 533 }
 534
 535 static int prune_refs(struct refspec *refs, int ref_count, struct ref *ref_map)
 536 {
 537         int result = 0;
 538         struct ref *ref, *stale_refs = get_stale_heads(refs, ref_count, ref_map);
 539         const char *dangling_msg = dry_run
 540                 ? _("   (%s will become dangling)\n")
 541                 : _("   (%s has become dangling)\n");
 542
 543         for (ref = stale_refs; ref; ref = ref->next) {
 544                 if (!dry_run)
 545                         result |= delete_ref(ref->name, NULL, 0);
 546                 if (verbosity >= 0) {
 547                         fprintf(stderr, " x %-*s %-*s -> %s\n",
 548                                 TRANSPORT_SUMMARY_WIDTH, _("[deleted]"),
 549                                 REFCOL_WIDTH, _("(none)"), prettify_refname(ref->name));
 550                         warn_dangling_symref(stderr, dangling_msg, ref->name);
 551                 }
 552         }
 553         free_refs(stale_refs);
 554         return result;
 555 }
 556
 557 static int add_existing(const char *refname, const unsigned char *sha1,
 558                         int flag, void *cbdata)
 559 {
 560         struct string_list *list = (struct string_list *)cbdata;
 561         struct string_list_item *item = string_list_insert(list, refname);
 562         item->util = (void *)sha1;
 563         return 0;
 564 }
 565
 566 static int will_fetch(struct ref **head, const unsigned char *sha1)
 567 {
 568         struct ref *rm = *head;
 569         while (rm) {
 570                 if (!hashcmp(rm->old_sha1, sha1))
 571                         return 1;
 572                 rm = rm->next;
 573         }
 574         return 0;
 575 }
 576
 577 static void find_non_local_tags(struct transport *transport,
 578                         struct ref **head,
 579                         struct ref ***tail)
 580 {
 581         struct string_list existing_refs = STRING_LIST_INIT_NODUP;
 582         struct string_list remote_refs = STRING_LIST_INIT_NODUP;
 583         const struct ref *ref;
 584         struct string_list_item *item = NULL;
 585
 586         for_each_ref(add_existing, &existing_refs);
 587         for (ref = transport_get_remote_refs(transport); ref; ref = ref->next) {
 588                 if (prefixcmp(ref->name, "refs/tags/"))
 589                         continue;
 590
 591                 /*
 592                  * The peeled ref always follows the matching base
 593                  * ref, so if we see a peeled ref that we don't want
 594                  * to fetch then we can mark the ref entry in the list
 595                  * as one to ignore by setting util to NULL.
 596                  */
 597                 if (!suffixcmp(ref->name, "^{}")) {
 598                         if (item && !has_sha1_file(ref->old_sha1) &&
 599                             !will_fetch(head, ref->old_sha1) &&
 600                             !has_sha1_file(item->util) &&
 601                             !will_fetch(head, item->util))
 602                                 item->util = NULL;
 603                         item = NULL;
 604                         continue;
 605                 }
 606
 607                 /*
 608                  * If item is non-NULL here, then we previously saw a
 609                  * ref not followed by a peeled reference, so we need
 610                  * to check if it is a lightweight tag that we want to
 611                  * fetch.
 612                  */
 613                 if (item && !has_sha1_file(item->util) &&
 614                     !will_fetch(head, item->util))
 615                         item->util = NULL;
 616
 617                 item = NULL;
 618
 619                 /* skip duplicates and refs that we already have */
 620                 if (string_list_has_string(&remote_refs, ref->name) ||
 621                     string_list_has_string(&existing_refs, ref->name))
 622                         continue;
 623
 624                 item = string_list_insert(&remote_refs, ref->name);
 625                 item->util = (void *)ref->old_sha1;
 626         }
 627         string_list_clear(&existing_refs, 0);
 628
 629         /*
 630          * We may have a final lightweight tag that needs to be
 631          * checked to see if it needs fetching.
 632          */
 633         if (item && !has_sha1_file(item->util) &&
 634             !will_fetch(head, item->util))
 635                 item->util = NULL;
 636
 637         /*
 638          * For all the tags in the remote_refs string list,
 639          * add them to the list of refs to be fetched
 640          */
 641         for_each_string_list_item(item, &remote_refs) {
 642                 /* Unless we have already decided to ignore this item... */
 643                 if (item->util)
 644                 {
 645                         struct ref *rm = alloc_ref(item->string);
 646                         rm->peer_ref = alloc_ref(item->string);
 647                         hashcpy(rm->old_sha1, item->util);
 648                         **tail = rm;
 649                         *tail = &rm->next;
 650                 }
 651         }
 652
 653         string_list_clear(&remote_refs, 0);
 654 }
 655
 656 static void check_not_current_branch(struct ref *ref_map)
 657 {
 658         struct branch *current_branch = branch_get(NULL);
 659
 660         if (is_bare_repository() || !current_branch)
 661                 return;
 662
 663         for (; ref_map; ref_map = ref_map->next)
 664                 if (ref_map->peer_ref && !strcmp(current_branch->refname,
 665                                         ref_map->peer_ref->name))
 666                         die(_("Refusing to fetch into current branch %s "
 667                             "of non-bare repository"), current_branch->refname);
 668 }
 669
 670 static int truncate_fetch_head(void)
 671 {
 672         char *filename = git_path("FETCH_HEAD");
 673         FILE *fp = fopen(filename, "w");
 674
 675         if (!fp)
 676                 return error(_("cannot open %s: %s\n"), filename, strerror(errno));
 677         fclose(fp);
 678         return 0;
 679 }
 680
 681 static int do_fetch(struct transport *transport,
 682                     struct refspec *refs, int ref_count)
 683 {
 684         struct string_list existing_refs = STRING_LIST_INIT_NODUP;
 685         struct string_list_item *peer_item = NULL;
 686         struct ref *ref_map;
 687         struct ref *rm;
 688         int autotags = (transport->remote->fetch_tags == 1);
 689
 690         for_each_ref(add_existing, &existing_refs);
 691
 692         if (tags == TAGS_DEFAULT) {
 693                 if (transport->remote->fetch_tags == 2)
 694                         tags = TAGS_SET;
 695                 if (transport->remote->fetch_tags == -1)
 696                         tags = TAGS_UNSET;
 697         }
 698
 699         if (!transport->get_refs_list || !transport->fetch)
 700                 die(_("Don't know how to fetch from %s"), transport->url);
 701
 702         /* if not appending, truncate FETCH_HEAD */
 703         if (!append && !dry_run) {
 704                 int errcode = truncate_fetch_head();
 705                 if (errcode)
 706                         return errcode;
 707         }
 708
 709         ref_map = get_ref_map(transport, refs, ref_count, tags, &autotags);
 710         if (!update_head_ok)
 711                 check_not_current_branch(ref_map);
 712
 713         for (rm = ref_map; rm; rm = rm->next) {
 714                 if (rm->peer_ref) {
 715                         peer_item = string_list_lookup(&existing_refs,
 716                                                        rm->peer_ref->name);
 717                         if (peer_item)
 718                                 hashcpy(rm->peer_ref->old_sha1,
 719                                         peer_item->util);
 720                 }
 721         }
 722
 723         if (tags == TAGS_DEFAULT && autotags)
 724                 transport_set_option(transport, TRANS_OPT_FOLLOWTAGS, "1");
 725         if (fetch_refs(transport, ref_map)) {
 726                 free_refs(ref_map);
 727                 return 1;
 728         }
 729         if (prune) {
 730                 /* If --tags was specified, pretend the user gave us the canonical tags refspec */
 731                 if (tags == TAGS_SET) {
 732                         const char *tags_str = "refs/tags/*:refs/tags/*";
 733                         struct refspec *tags_refspec, *refspec;
 734
 735                         /* Copy the refspec and add the tags to it */
 736                         refspec = xcalloc(ref_count + 1, sizeof(struct refspec));
 737                         tags_refspec = parse_fetch_refspec(1, &tags_str);
 738                         memcpy(refspec, refs, ref_count * sizeof(struct refspec));
 739                         memcpy(&refspec[ref_count], tags_refspec, sizeof(struct refspec));
 740                         ref_count++;
 741
 742                         prune_refs(refspec, ref_count, ref_map);
 743
 744                         ref_count--;
 745                         /* The rest of the strings belong to fetch_one */
 746                         free_refspec(1, tags_refspec);
 747                         free(refspec);
 748                 } else if (ref_count) {
 749                         prune_refs(refs, ref_count, ref_map);
 750                 } else {
 751                         prune_refs(transport->remote->fetch, transport->remote->fetch_refspec_nr, ref_map);
 752                 }
 753         }
 754         free_refs(ref_map);
 755
 756         /* if neither --no-tags nor --tags was specified, do automated tag
 757          * following ... */
 758         if (tags == TAGS_DEFAULT && autotags) {
 759                 struct ref **tail = &ref_map;
 760                 ref_map = NULL;
 761                 find_non_local_tags(transport, &ref_map, &tail);
 762                 if (ref_map) {
 763                         transport_set_option(transport, TRANS_OPT_FOLLOWTAGS, NULL);
 764                         transport_set_option(transport, TRANS_OPT_DEPTH, "0");
 765                         fetch_refs(transport, ref_map);
 766                 }
 767                 free_refs(ref_map);
 768         }
 769
 770         return 0;
 771 }
 772
 773 static void set_option(const char *name, const char *value)
 774 {
 775         int r = transport_set_option(transport, name, value);
 776         if (r < 0)
 777                 die(_("Option \"%s\" value \"%s\" is not valid for %s"),
 778                         name, value, transport->url);
 779         if (r > 0)
 780                 warning(_("Option \"%s\" is ignored for %s\n"),
 781                         name, transport->url);
 782 }
 783
 784 static int get_one_remote_for_fetch(struct remote *remote, void *priv)
 785 {
 786         struct string_list *list = priv;
 787         if (!remote->skip_default_update)
 788                 string_list_append(list, remote->name);
 789         return 0;
 790 }
 791
 792 struct remote_group_data {
 793         const char *name;
 794         struct string_list *list;
 795 };
 796
 797 static int get_remote_group(const char *key, const char *value, void *priv)
 798 {
 799         struct remote_group_data *g = priv;
 800
 801         if (!prefixcmp(key, "remotes.") &&
 802                         !strcmp(key + 8, g->name)) {
 803                 /* split list by white space */
 804                 int space = strcspn(value, " \t\n");
 805                 while (*value) {
 806                         if (space > 1) {
 807                                 string_list_append(g->list,
 808                                                    xstrndup(value, space));
 809                         }
 810                         value += space + (value[space] != '\0');
 811                         space = strcspn(value, " \t\n");
 812                 }
 813         }
 814
 815         return 0;
 816 }
 817
 818 static int add_remote_or_group(const char *name, struct string_list *list)
 819 {
 820         int prev_nr = list->nr;
 821         struct remote_group_data g;
 822         g.name = name; g.list = list;
 823
 824         git_config(get_remote_group, &g);
 825         if (list->nr == prev_nr) {
 826                 struct remote *remote;
 827                 if (!remote_is_configured(name))
 828                         return 0;
 829                 remote = remote_get(name);
 830                 string_list_append(list, remote->name);
 831         }
 832         return 1;
 833 }
 834
 835 static void add_options_to_argv(int *argc, const char **argv)
 836 {
 837         if (dry_run)
 838                 argv[(*argc)++] = "--dry-run";
 839         if (prune)
 840                 argv[(*argc)++] = "--prune";
 841         if (update_head_ok)
 842                 argv[(*argc)++] = "--update-head-ok";
 843         if (force)
 844                 argv[(*argc)++] = "--force";
 845         if (keep)
 846                 argv[(*argc)++] = "--keep";
 847         if (recurse_submodules == RECURSE_SUBMODULES_ON)
 848                 argv[(*argc)++] = "--recurse-submodules";
 849         else if (recurse_submodules == RECURSE_SUBMODULES_ON_DEMAND)
 850                 argv[(*argc)++] = "--recurse-submodules=on-demand";
 851         if (verbosity >= 2)
 852                 argv[(*argc)++] = "-v";
 853         if (verbosity >= 1)
 854                 argv[(*argc)++] = "-v";
 855         else if (verbosity < 0)
 856                 argv[(*argc)++] = "-q";
 857
 858 }
 859
 860 static int fetch_multiple(struct string_list *list)
 861 {
 862         int i, result = 0;
 863         const char *argv[12] = { "fetch", "--append" };
 864         int argc = 2;
 865
 866         add_options_to_argv(&argc, argv);
 867
 868         if (!append && !dry_run) {
 869                 int errcode = truncate_fetch_head();
 870                 if (errcode)
 871                         return errcode;
 872         }
 873
 874         for (i = 0; i < list->nr; i++) {
 875                 const char *name = list->items[i].string;
 876                 argv[argc] = name;
 877                 argv[argc + 1] = NULL;
 878                 if (verbosity >= 0)
 879                         printf(_("Fetching %s\n"), name);
 880                 if (run_command_v_opt(argv, RUN_GIT_CMD)) {
 881                         error(_("Could not fetch %s"), name);
 882                         result = 1;
 883                 }
 884         }
 885
 886         return result;
 887 }
 888
 889 static int fetch_one(struct remote *remote, int argc, const char **argv)
 890 {
 891         int i;
 892         static const char **refs = NULL;
 893         struct refspec *refspec;
 894         int ref_nr = 0;
 895         int exit_code;
 896
 897         if (!remote)
 898                 die(_("No remote repository specified.  Please, specify either a URL or a\n"
 899                     "remote name from which new revisions should be fetched."));
 900
 901         transport = transport_get(remote, NULL);
 902         transport_set_verbosity(transport, verbosity, progress);
 903         if (upload_pack)
 904                 set_option(TRANS_OPT_UPLOADPACK, upload_pack);
 905         if (keep)
 906                 set_option(TRANS_OPT_KEEP, "yes");
 907         if (depth)
 908                 set_option(TRANS_OPT_DEPTH, depth);
 909
 910         if (argc > 0) {
 911                 int j = 0;
 912                 refs = xcalloc(argc + 1, sizeof(const char *));
 913                 for (i = 0; i < argc; i++) {
 914                         if (!strcmp(argv[i], "tag")) {
 915                                 char *ref;
 916                                 i++;
 917                                 if (i >= argc)
 918                                         die(_("You need to specify a tag name."));
 919                                 ref = xmalloc(strlen(argv[i]) * 2 + 22);
 920                                 strcpy(ref, "refs/tags/");
 921                                 strcat(ref, argv[i]);
 922                                 strcat(ref, ":refs/tags/");
 923                                 strcat(ref, argv[i]);
 924                                 refs[j++] = ref;
 925                         } else
 926                                 refs[j++] = argv[i];
 927                 }
 928                 refs[j] = NULL;
 929                 ref_nr = j;
 930         }
 931
 932         sigchain_push_common(unlock_pack_on_signal);
 933         atexit(unlock_pack);
 934         refspec = parse_fetch_refspec(ref_nr, refs);
 935         exit_code = do_fetch(transport, refspec, ref_nr);
 936         free_refspec(ref_nr, refspec);
 937         transport_disconnect(transport);
 938         transport = NULL;
 939         return exit_code;
 940 }
 941
 942 int cmd_fetch(int argc, const char **argv, const char *prefix)
 943 {
 944         int i;
 945         struct string_list list = STRING_LIST_INIT_NODUP;
 946         struct remote *remote;
 947         int result = 0;
 948
 949         packet_trace_identity("fetch");
 950
 951         /* Record the command line for the reflog */
 952         strbuf_addstr(&default_rla, "fetch");
 953         for (i = 1; i < argc; i++)
 954                 strbuf_addf(&default_rla, " %s", argv[i]);
 955
 956         argc = parse_options(argc, argv, prefix,
 957                              builtin_fetch_options, builtin_fetch_usage, 0);
 958
 959         if (recurse_submodules != RECURSE_SUBMODULES_OFF) {
 960                 if (recurse_submodules_default) {
 961                         int arg = parse_fetch_recurse_submodules_arg("--recurse-submodules-default", recurse_submodules_default);
 962                         set_config_fetch_recurse_submodules(arg);
 963                 }
 964                 gitmodules_config();
 965                 git_config(submodule_config, NULL);
 966         }
 967
 968         if (all) {
 969                 if (argc == 1)
 970                         die(_("fetch --all does not take a repository argument"));
 971                 else if (argc > 1)
 972                         die(_("fetch --all does not make sense with refspecs"));
 973                 (void) for_each_remote(get_one_remote_for_fetch, &list);
 974                 result = fetch_multiple(&list);
 975         } else if (argc == 0) {
 976                 /* No arguments -- use default remote */
 977                 remote = remote_get(NULL);
 978                 result = fetch_one(remote, argc, argv);
 979         } else if (multiple) {
 980                 /* All arguments are assumed to be remotes or groups */
 981                 for (i = 0; i < argc; i++)
 982                         if (!add_remote_or_group(argv[i], &list))
 983                                 die(_("No such remote or remote group: %s"), argv[i]);
 984                 result = fetch_multiple(&list);
 985         } else {
 986                 /* Single remote or group */
 987                 (void) add_remote_or_group(argv[0], &list);
 988                 if (list.nr > 1) {
 989                         /* More than one remote */
 990                         if (argc > 1)
 991                                 die(_("Fetching a group and specifying refspecs does not make sense"));
 992                         result = fetch_multiple(&list);
 993                 } else {
 994                         /* Zero or one remotes */
 995                         remote = remote_get(argv[0]);
 996                         result = fetch_one(remote, argc-1, argv+1);
 997                 }
 998         }
 999
1000         if (!result && (recurse_submodules != RECURSE_SUBMODULES_OFF)) {
1001                 const char *options[10];
1002                 int num_options = 0;
1003                 add_options_to_argv(&num_options, options);
1004                 result = fetch_populated_submodules(num_options, options,
1005                                                     submodule_prefix,
1006                                                     recurse_submodules,
1007                                                     verbosity < 0);
1008         }
1009
1010         /* All names were strdup()ed or strndup()ed */
1011         list.strdup_strings = 1;
1012         string_list_clear(&list, 0);
1013
1014         return result;
1015 }