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                             char *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         *display = 0;
 251         type = sha1_object_info(ref->new_sha1, NULL);
 252         if (type < 0)
 253                 die(_("object %s not found"), sha1_to_hex(ref->new_sha1));
 254
 255         if (!hashcmp(ref->old_sha1, ref->new_sha1)) {
 256                 if (verbosity > 0)
 257                         sprintf(display, "= %-*s %-*s -> %s", TRANSPORT_SUMMARY_WIDTH,
 258                                 _("[up to date]"), REFCOL_WIDTH, remote,
 259                                 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                 sprintf(display, _("! %-*s %-*s -> %s  (can't fetch in current branch)"),
 272                         TRANSPORT_SUMMARY_WIDTH, _("[rejected]"), REFCOL_WIDTH, remote,
 273                         pretty_ref);
 274                 return 1;
 275         }
 276
 277         if (!is_null_sha1(ref->old_sha1) &&
 278             !prefixcmp(ref->name, "refs/tags/")) {
 279                 int r;
 280                 r = s_update_ref("updating tag", ref, 0);
 281                 sprintf(display, "%c %-*s %-*s -> %s%s", r ? '!' : '-',
 282                         TRANSPORT_SUMMARY_WIDTH, _("[tag update]"), REFCOL_WIDTH, remote,
 283                         pretty_ref, r ? _("  (unable to update local ref)") : "");
 284                 return r;
 285         }
 286
 287         current = lookup_commit_reference_gently(ref->old_sha1, 1);
 288         updated = lookup_commit_reference_gently(ref->new_sha1, 1);
 289         if (!current || !updated) {
 290                 const char *msg;
 291                 const char *what;
 292                 int r;
 293                 if (!strncmp(ref->name, "refs/tags/", 10)) {
 294                         msg = "storing tag";
 295                         what = _("[new tag]");
 296                 }
 297                 else {
 298                         msg = "storing head";
 299                         what = _("[new branch]");
 300                         if ((recurse_submodules != RECURSE_SUBMODULES_OFF) &&
 301                             (recurse_submodules != RECURSE_SUBMODULES_ON))
 302                                 check_for_new_submodule_commits(ref->new_sha1);
 303                 }
 304
 305                 r = s_update_ref(msg, ref, 0);
 306                 sprintf(display, "%c %-*s %-*s -> %s%s", r ? '!' : '*',
 307                         TRANSPORT_SUMMARY_WIDTH, what, REFCOL_WIDTH, remote, pretty_ref,
 308                         r ? _("  (unable to update local ref)") : "");
 309                 return r;
 310         }
 311
 312         if (in_merge_bases(current, &updated, 1)) {
 313                 char quickref[83];
 314                 int r;
 315                 strcpy(quickref, find_unique_abbrev(current->object.sha1, DEFAULT_ABBREV));
 316                 strcat(quickref, "..");
 317                 strcat(quickref, find_unique_abbrev(ref->new_sha1, DEFAULT_ABBREV));
 318                 if ((recurse_submodules != RECURSE_SUBMODULES_OFF) &&
 319                     (recurse_submodules != RECURSE_SUBMODULES_ON))
 320                         check_for_new_submodule_commits(ref->new_sha1);
 321                 r = s_update_ref("fast-forward", ref, 1);
 322                 sprintf(display, "%c %-*s %-*s -> %s%s", r ? '!' : ' ',
 323                         TRANSPORT_SUMMARY_WIDTH, quickref, REFCOL_WIDTH, remote,
 324                         pretty_ref, r ? _("  (unable to update local ref)") : "");
 325                 return r;
 326         } else if (force || ref->force) {
 327                 char quickref[84];
 328                 int r;
 329                 strcpy(quickref, find_unique_abbrev(current->object.sha1, DEFAULT_ABBREV));
 330                 strcat(quickref, "...");
 331                 strcat(quickref, find_unique_abbrev(ref->new_sha1, DEFAULT_ABBREV));
 332                 if ((recurse_submodules != RECURSE_SUBMODULES_OFF) &&
 333                     (recurse_submodules != RECURSE_SUBMODULES_ON))
 334                         check_for_new_submodule_commits(ref->new_sha1);
 335                 r = s_update_ref("forced-update", ref, 1);
 336                 sprintf(display, "%c %-*s %-*s -> %s  (%s)", r ? '!' : '+',
 337                         TRANSPORT_SUMMARY_WIDTH, quickref, REFCOL_WIDTH, remote,
 338                         pretty_ref,
 339                         r ? _("unable to update local ref") : _("forced update"));
 340                 return r;
 341         } else {
 342                 sprintf(display, "! %-*s %-*s -> %s  %s",
 343                         TRANSPORT_SUMMARY_WIDTH, _("[rejected]"), REFCOL_WIDTH, remote,
 344                         pretty_ref, _("(non-fast-forward)"));
 345                 return 1;
 346         }
 347 }
 348
 349 static int iterate_ref_map(void *cb_data, unsigned char sha1[20])
 350 {
 351         struct ref **rm = cb_data;
 352         struct ref *ref = *rm;
 353
 354         if (!ref)
 355                 return -1; /* end of the list */
 356         *rm = ref->next;
 357         hashcpy(sha1, ref->old_sha1);
 358         return 0;
 359 }
 360
 361 static int store_updated_refs(const char *raw_url, const char *remote_name,
 362                 struct ref *ref_map)
 363 {
 364         FILE *fp;
 365         struct commit *commit;
 366         int url_len, i, note_len, shown_url = 0, rc = 0;
 367         char note[1024];
 368         const char *what, *kind;
 369         struct ref *rm;
 370         char *url, *filename = dry_run ? "/dev/null" : git_path("FETCH_HEAD");
 371
 372         fp = fopen(filename, "a");
 373         if (!fp)
 374                 return error(_("cannot open %s: %s\n"), filename, strerror(errno));
 375
 376         if (raw_url)
 377                 url = transport_anonymize_url(raw_url);
 378         else
 379                 url = xstrdup("foreign");
 380
 381         rm = ref_map;
 382         if (check_everything_connected(iterate_ref_map, 0, &rm)) {
 383                 rc = error(_("%s did not send all necessary objects\n"), url);
 384                 goto abort;
 385         }
 386
 387         for (rm = ref_map; rm; rm = rm->next) {
 388                 struct ref *ref = NULL;
 389
 390                 if (rm->peer_ref) {
 391                         ref = xcalloc(1, sizeof(*ref) + strlen(rm->peer_ref->name) + 1);
 392                         strcpy(ref->name, rm->peer_ref->name);
 393                         hashcpy(ref->old_sha1, rm->peer_ref->old_sha1);
 394                         hashcpy(ref->new_sha1, rm->old_sha1);
 395                         ref->force = rm->peer_ref->force;
 396                 }
 397
 398                 commit = lookup_commit_reference_gently(rm->old_sha1, 1);
 399                 if (!commit)
 400                         rm->merge = 0;
 401
 402                 if (!strcmp(rm->name, "HEAD")) {
 403                         kind = "";
 404                         what = "";
 405                 }
 406                 else if (!prefixcmp(rm->name, "refs/heads/")) {
 407                         kind = "branch";
 408                         what = rm->name + 11;
 409                 }
 410                 else if (!prefixcmp(rm->name, "refs/tags/")) {
 411                         kind = "tag";
 412                         what = rm->name + 10;
 413                 }
 414                 else if (!prefixcmp(rm->name, "refs/remotes/")) {
 415                         kind = "remote-tracking branch";
 416                         what = rm->name + 13;
 417                 }
 418                 else {
 419                         kind = "";
 420                         what = rm->name;
 421                 }
 422
 423                 url_len = strlen(url);
 424                 for (i = url_len - 1; url[i] == '/' && 0 <= i; i--)
 425                         ;
 426                 url_len = i + 1;
 427                 if (4 < i && !strncmp(".git", url + i - 3, 4))
 428                         url_len = i - 3;
 429
 430                 note_len = 0;
 431                 if (*what) {
 432                         if (*kind)
 433                                 note_len += sprintf(note + note_len, "%s ",
 434                                                     kind);
 435                         note_len += sprintf(note + note_len, "'%s' of ", what);
 436                 }
 437                 note[note_len] = '\0';
 438                 fprintf(fp, "%s\t%s\t%s",
 439                         sha1_to_hex(rm->old_sha1),
 440                         rm->merge ? "" : "not-for-merge",
 441                         note);
 442                 for (i = 0; i < url_len; ++i)
 443                         if ('\n' == url[i])
 444                                 fputs("\\n", fp);
 445                         else
 446                                 fputc(url[i], fp);
 447                 fputc('\n', fp);
 448
 449                 if (ref) {
 450                         rc |= update_local_ref(ref, what, note);
 451                         free(ref);
 452                 } else
 453                         sprintf(note, "* %-*s %-*s -> FETCH_HEAD",
 454                                 TRANSPORT_SUMMARY_WIDTH, *kind ? kind : "branch",
 455                                  REFCOL_WIDTH, *what ? what : "HEAD");
 456                 if (*note) {
 457                         if (verbosity >= 0 && !shown_url) {
 458                                 fprintf(stderr, _("From %.*s\n"),
 459                                                 url_len, url);
 460                                 shown_url = 1;
 461                         }
 462                         if (verbosity >= 0)
 463                                 fprintf(stderr, " %s\n", note);
 464                 }
 465         }
 466
 467         if (rc & STORE_REF_ERROR_DF_CONFLICT)
 468                 error(_("some local refs could not be updated; try running\n"
 469                       " 'git remote prune %s' to remove any old, conflicting "
 470                       "branches"), remote_name);
 471
 472  abort:
 473         free(url);
 474         fclose(fp);
 475         return rc;
 476 }
 477
 478 /*
 479  * We would want to bypass the object transfer altogether if
 480  * everything we are going to fetch already exists and is connected
 481  * locally.
 482  */
 483 static int quickfetch(struct ref *ref_map)
 484 {
 485         struct ref *rm = ref_map;
 486
 487         /*
 488          * If we are deepening a shallow clone we already have these
 489          * objects reachable.  Running rev-list here will return with
 490          * a good (0) exit status and we'll bypass the fetch that we
 491          * really need to perform.  Claiming failure now will ensure
 492          * we perform the network exchange to deepen our history.
 493          */
 494         if (depth)
 495                 return -1;
 496         return check_everything_connected(iterate_ref_map, 1, &rm);
 497 }
 498
 499 static int fetch_refs(struct transport *transport, struct ref *ref_map)
 500 {
 501         int ret = quickfetch(ref_map);
 502         if (ret)
 503                 ret = transport_fetch_refs(transport, ref_map);
 504         if (!ret)
 505                 ret |= store_updated_refs(transport->url,
 506                                 transport->remote->name,
 507                                 ref_map);
 508         transport_unlock_pack(transport);
 509         return ret;
 510 }
 511
 512 static int prune_refs(struct refspec *refs, int ref_count, struct ref *ref_map)
 513 {
 514         int result = 0;
 515         struct ref *ref, *stale_refs = get_stale_heads(refs, ref_count, ref_map);
 516         const char *dangling_msg = dry_run
 517                 ? _("   (%s will become dangling)\n")
 518                 : _("   (%s has become dangling)\n");
 519
 520         for (ref = stale_refs; ref; ref = ref->next) {
 521                 if (!dry_run)
 522                         result |= delete_ref(ref->name, NULL, 0);
 523                 if (verbosity >= 0) {
 524                         fprintf(stderr, " x %-*s %-*s -> %s\n",
 525                                 TRANSPORT_SUMMARY_WIDTH, _("[deleted]"),
 526                                 REFCOL_WIDTH, _("(none)"), prettify_refname(ref->name));
 527                         warn_dangling_symref(stderr, dangling_msg, ref->name);
 528                 }
 529         }
 530         free_refs(stale_refs);
 531         return result;
 532 }
 533
 534 static int add_existing(const char *refname, const unsigned char *sha1,
 535                         int flag, void *cbdata)
 536 {
 537         struct string_list *list = (struct string_list *)cbdata;
 538         struct string_list_item *item = string_list_insert(list, refname);
 539         item->util = (void *)sha1;
 540         return 0;
 541 }
 542
 543 static int will_fetch(struct ref **head, const unsigned char *sha1)
 544 {
 545         struct ref *rm = *head;
 546         while (rm) {
 547                 if (!hashcmp(rm->old_sha1, sha1))
 548                         return 1;
 549                 rm = rm->next;
 550         }
 551         return 0;
 552 }
 553
 554 static void find_non_local_tags(struct transport *transport,
 555                         struct ref **head,
 556                         struct ref ***tail)
 557 {
 558         struct string_list existing_refs = STRING_LIST_INIT_NODUP;
 559         struct string_list remote_refs = STRING_LIST_INIT_NODUP;
 560         const struct ref *ref;
 561         struct string_list_item *item = NULL;
 562
 563         for_each_ref(add_existing, &existing_refs);
 564         for (ref = transport_get_remote_refs(transport); ref; ref = ref->next) {
 565                 if (prefixcmp(ref->name, "refs/tags"))
 566                         continue;
 567
 568                 /*
 569                  * The peeled ref always follows the matching base
 570                  * ref, so if we see a peeled ref that we don't want
 571                  * to fetch then we can mark the ref entry in the list
 572                  * as one to ignore by setting util to NULL.
 573                  */
 574                 if (!suffixcmp(ref->name, "^{}")) {
 575                         if (item && !has_sha1_file(ref->old_sha1) &&
 576                             !will_fetch(head, ref->old_sha1) &&
 577                             !has_sha1_file(item->util) &&
 578                             !will_fetch(head, item->util))
 579                                 item->util = NULL;
 580                         item = NULL;
 581                         continue;
 582                 }
 583
 584                 /*
 585                  * If item is non-NULL here, then we previously saw a
 586                  * ref not followed by a peeled reference, so we need
 587                  * to check if it is a lightweight tag that we want to
 588                  * fetch.
 589                  */
 590                 if (item && !has_sha1_file(item->util) &&
 591                     !will_fetch(head, item->util))
 592                         item->util = NULL;
 593
 594                 item = NULL;
 595
 596                 /* skip duplicates and refs that we already have */
 597                 if (string_list_has_string(&remote_refs, ref->name) ||
 598                     string_list_has_string(&existing_refs, ref->name))
 599                         continue;
 600
 601                 item = string_list_insert(&remote_refs, ref->name);
 602                 item->util = (void *)ref->old_sha1;
 603         }
 604         string_list_clear(&existing_refs, 0);
 605
 606         /*
 607          * We may have a final lightweight tag that needs to be
 608          * checked to see if it needs fetching.
 609          */
 610         if (item && !has_sha1_file(item->util) &&
 611             !will_fetch(head, item->util))
 612                 item->util = NULL;
 613
 614         /*
 615          * For all the tags in the remote_refs string list,
 616          * add them to the list of refs to be fetched
 617          */
 618         for_each_string_list_item(item, &remote_refs) {
 619                 /* Unless we have already decided to ignore this item... */
 620                 if (item->util)
 621                 {
 622                         struct ref *rm = alloc_ref(item->string);
 623                         rm->peer_ref = alloc_ref(item->string);
 624                         hashcpy(rm->old_sha1, item->util);
 625                         **tail = rm;
 626                         *tail = &rm->next;
 627                 }
 628         }
 629
 630         string_list_clear(&remote_refs, 0);
 631 }
 632
 633 static void check_not_current_branch(struct ref *ref_map)
 634 {
 635         struct branch *current_branch = branch_get(NULL);
 636
 637         if (is_bare_repository() || !current_branch)
 638                 return;
 639
 640         for (; ref_map; ref_map = ref_map->next)
 641                 if (ref_map->peer_ref && !strcmp(current_branch->refname,
 642                                         ref_map->peer_ref->name))
 643                         die(_("Refusing to fetch into current branch %s "
 644                             "of non-bare repository"), current_branch->refname);
 645 }
 646
 647 static int truncate_fetch_head(void)
 648 {
 649         char *filename = git_path("FETCH_HEAD");
 650         FILE *fp = fopen(filename, "w");
 651
 652         if (!fp)
 653                 return error(_("cannot open %s: %s\n"), filename, strerror(errno));
 654         fclose(fp);
 655         return 0;
 656 }
 657
 658 static int do_fetch(struct transport *transport,
 659                     struct refspec *refs, int ref_count)
 660 {
 661         struct string_list existing_refs = STRING_LIST_INIT_NODUP;
 662         struct string_list_item *peer_item = NULL;
 663         struct ref *ref_map;
 664         struct ref *rm;
 665         int autotags = (transport->remote->fetch_tags == 1);
 666
 667         for_each_ref(add_existing, &existing_refs);
 668
 669         if (tags == TAGS_DEFAULT) {
 670                 if (transport->remote->fetch_tags == 2)
 671                         tags = TAGS_SET;
 672                 if (transport->remote->fetch_tags == -1)
 673                         tags = TAGS_UNSET;
 674         }
 675
 676         if (!transport->get_refs_list || !transport->fetch)
 677                 die(_("Don't know how to fetch from %s"), transport->url);
 678
 679         /* if not appending, truncate FETCH_HEAD */
 680         if (!append && !dry_run) {
 681                 int errcode = truncate_fetch_head();
 682                 if (errcode)
 683                         return errcode;
 684         }
 685
 686         ref_map = get_ref_map(transport, refs, ref_count, tags, &autotags);
 687         if (!update_head_ok)
 688                 check_not_current_branch(ref_map);
 689
 690         for (rm = ref_map; rm; rm = rm->next) {
 691                 if (rm->peer_ref) {
 692                         peer_item = string_list_lookup(&existing_refs,
 693                                                        rm->peer_ref->name);
 694                         if (peer_item)
 695                                 hashcpy(rm->peer_ref->old_sha1,
 696                                         peer_item->util);
 697                 }
 698         }
 699
 700         if (tags == TAGS_DEFAULT && autotags)
 701                 transport_set_option(transport, TRANS_OPT_FOLLOWTAGS, "1");
 702         if (fetch_refs(transport, ref_map)) {
 703                 free_refs(ref_map);
 704                 return 1;
 705         }
 706         if (prune) {
 707                 /* If --tags was specified, pretend the user gave us the canonical tags refspec */
 708                 if (tags == TAGS_SET) {
 709                         const char *tags_str = "refs/tags/*:refs/tags/*";
 710                         struct refspec *tags_refspec, *refspec;
 711
 712                         /* Copy the refspec and add the tags to it */
 713                         refspec = xcalloc(ref_count + 1, sizeof(struct refspec));
 714                         tags_refspec = parse_fetch_refspec(1, &tags_str);
 715                         memcpy(refspec, refs, ref_count * sizeof(struct refspec));
 716                         memcpy(&refspec[ref_count], tags_refspec, sizeof(struct refspec));
 717                         ref_count++;
 718
 719                         prune_refs(refspec, ref_count, ref_map);
 720
 721                         ref_count--;
 722                         /* The rest of the strings belong to fetch_one */
 723                         free_refspec(1, tags_refspec);
 724                         free(refspec);
 725                 } else if (ref_count) {
 726                         prune_refs(refs, ref_count, ref_map);
 727                 } else {
 728                         prune_refs(transport->remote->fetch, transport->remote->fetch_refspec_nr, ref_map);
 729                 }
 730         }
 731         free_refs(ref_map);
 732
 733         /* if neither --no-tags nor --tags was specified, do automated tag
 734          * following ... */
 735         if (tags == TAGS_DEFAULT && autotags) {
 736                 struct ref **tail = &ref_map;
 737                 ref_map = NULL;
 738                 find_non_local_tags(transport, &ref_map, &tail);
 739                 if (ref_map) {
 740                         transport_set_option(transport, TRANS_OPT_FOLLOWTAGS, NULL);
 741                         transport_set_option(transport, TRANS_OPT_DEPTH, "0");
 742                         fetch_refs(transport, ref_map);
 743                 }
 744                 free_refs(ref_map);
 745         }
 746
 747         return 0;
 748 }
 749
 750 static void set_option(const char *name, const char *value)
 751 {
 752         int r = transport_set_option(transport, name, value);
 753         if (r < 0)
 754                 die(_("Option \"%s\" value \"%s\" is not valid for %s"),
 755                         name, value, transport->url);
 756         if (r > 0)
 757                 warning(_("Option \"%s\" is ignored for %s\n"),
 758                         name, transport->url);
 759 }
 760
 761 static int get_one_remote_for_fetch(struct remote *remote, void *priv)
 762 {
 763         struct string_list *list = priv;
 764         if (!remote->skip_default_update)
 765                 string_list_append(list, remote->name);
 766         return 0;
 767 }
 768
 769 struct remote_group_data {
 770         const char *name;
 771         struct string_list *list;
 772 };
 773
 774 static int get_remote_group(const char *key, const char *value, void *priv)
 775 {
 776         struct remote_group_data *g = priv;
 777
 778         if (!prefixcmp(key, "remotes.") &&
 779                         !strcmp(key + 8, g->name)) {
 780                 /* split list by white space */
 781                 int space = strcspn(value, " \t\n");
 782                 while (*value) {
 783                         if (space > 1) {
 784                                 string_list_append(g->list,
 785                                                    xstrndup(value, space));
 786                         }
 787                         value += space + (value[space] != '\0');
 788                         space = strcspn(value, " \t\n");
 789                 }
 790         }
 791
 792         return 0;
 793 }
 794
 795 static int add_remote_or_group(const char *name, struct string_list *list)
 796 {
 797         int prev_nr = list->nr;
 798         struct remote_group_data g;
 799         g.name = name; g.list = list;
 800
 801         git_config(get_remote_group, &g);
 802         if (list->nr == prev_nr) {
 803                 struct remote *remote;
 804                 if (!remote_is_configured(name))
 805                         return 0;
 806                 remote = remote_get(name);
 807                 string_list_append(list, remote->name);
 808         }
 809         return 1;
 810 }
 811
 812 static void add_options_to_argv(int *argc, const char **argv)
 813 {
 814         if (dry_run)
 815                 argv[(*argc)++] = "--dry-run";
 816         if (prune)
 817                 argv[(*argc)++] = "--prune";
 818         if (update_head_ok)
 819                 argv[(*argc)++] = "--update-head-ok";
 820         if (force)
 821                 argv[(*argc)++] = "--force";
 822         if (keep)
 823                 argv[(*argc)++] = "--keep";
 824         if (recurse_submodules == RECURSE_SUBMODULES_ON)
 825                 argv[(*argc)++] = "--recurse-submodules";
 826         else if (recurse_submodules == RECURSE_SUBMODULES_ON_DEMAND)
 827                 argv[(*argc)++] = "--recurse-submodules=on-demand";
 828         if (verbosity >= 2)
 829                 argv[(*argc)++] = "-v";
 830         if (verbosity >= 1)
 831                 argv[(*argc)++] = "-v";
 832         else if (verbosity < 0)
 833                 argv[(*argc)++] = "-q";
 834
 835 }
 836
 837 static int fetch_multiple(struct string_list *list)
 838 {
 839         int i, result = 0;
 840         const char *argv[12] = { "fetch", "--append" };
 841         int argc = 2;
 842
 843         add_options_to_argv(&argc, argv);
 844
 845         if (!append && !dry_run) {
 846                 int errcode = truncate_fetch_head();
 847                 if (errcode)
 848                         return errcode;
 849         }
 850
 851         for (i = 0; i < list->nr; i++) {
 852                 const char *name = list->items[i].string;
 853                 argv[argc] = name;
 854                 argv[argc + 1] = NULL;
 855                 if (verbosity >= 0)
 856                         printf(_("Fetching %s\n"), name);
 857                 if (run_command_v_opt(argv, RUN_GIT_CMD)) {
 858                         error(_("Could not fetch %s"), name);
 859                         result = 1;
 860                 }
 861         }
 862
 863         return result;
 864 }
 865
 866 static int fetch_one(struct remote *remote, int argc, const char **argv)
 867 {
 868         int i;
 869         static const char **refs = NULL;
 870         struct refspec *refspec;
 871         int ref_nr = 0;
 872         int exit_code;
 873
 874         if (!remote)
 875                 die(_("No remote repository specified.  Please, specify either a URL or a\n"
 876                     "remote name from which new revisions should be fetched."));
 877
 878         transport = transport_get(remote, NULL);
 879         transport_set_verbosity(transport, verbosity, progress);
 880         if (upload_pack)
 881                 set_option(TRANS_OPT_UPLOADPACK, upload_pack);
 882         if (keep)
 883                 set_option(TRANS_OPT_KEEP, "yes");
 884         if (depth)
 885                 set_option(TRANS_OPT_DEPTH, depth);
 886
 887         if (argc > 0) {
 888                 int j = 0;
 889                 refs = xcalloc(argc + 1, sizeof(const char *));
 890                 for (i = 0; i < argc; i++) {
 891                         if (!strcmp(argv[i], "tag")) {
 892                                 char *ref;
 893                                 i++;
 894                                 if (i >= argc)
 895                                         die(_("You need to specify a tag name."));
 896                                 ref = xmalloc(strlen(argv[i]) * 2 + 22);
 897                                 strcpy(ref, "refs/tags/");
 898                                 strcat(ref, argv[i]);
 899                                 strcat(ref, ":refs/tags/");
 900                                 strcat(ref, argv[i]);
 901                                 refs[j++] = ref;
 902                         } else
 903                                 refs[j++] = argv[i];
 904                 }
 905                 refs[j] = NULL;
 906                 ref_nr = j;
 907         }
 908
 909         sigchain_push_common(unlock_pack_on_signal);
 910         atexit(unlock_pack);
 911         refspec = parse_fetch_refspec(ref_nr, refs);
 912         exit_code = do_fetch(transport, refspec, ref_nr);
 913         free_refspec(ref_nr, refspec);
 914         transport_disconnect(transport);
 915         transport = NULL;
 916         return exit_code;
 917 }
 918
 919 int cmd_fetch(int argc, const char **argv, const char *prefix)
 920 {
 921         int i;
 922         struct string_list list = STRING_LIST_INIT_NODUP;
 923         struct remote *remote;
 924         int result = 0;
 925
 926         packet_trace_identity("fetch");
 927
 928         /* Record the command line for the reflog */
 929         strbuf_addstr(&default_rla, "fetch");
 930         for (i = 1; i < argc; i++)
 931                 strbuf_addf(&default_rla, " %s", argv[i]);
 932
 933         argc = parse_options(argc, argv, prefix,
 934                              builtin_fetch_options, builtin_fetch_usage, 0);
 935
 936         if (recurse_submodules != RECURSE_SUBMODULES_OFF) {
 937                 if (recurse_submodules_default) {
 938                         int arg = parse_fetch_recurse_submodules_arg("--recurse-submodules-default", recurse_submodules_default);
 939                         set_config_fetch_recurse_submodules(arg);
 940                 }
 941                 gitmodules_config();
 942                 git_config(submodule_config, NULL);
 943         }
 944
 945         if (all) {
 946                 if (argc == 1)
 947                         die(_("fetch --all does not take a repository argument"));
 948                 else if (argc > 1)
 949                         die(_("fetch --all does not make sense with refspecs"));
 950                 (void) for_each_remote(get_one_remote_for_fetch, &list);
 951                 result = fetch_multiple(&list);
 952         } else if (argc == 0) {
 953                 /* No arguments -- use default remote */
 954                 remote = remote_get(NULL);
 955                 result = fetch_one(remote, argc, argv);
 956         } else if (multiple) {
 957                 /* All arguments are assumed to be remotes or groups */
 958                 for (i = 0; i < argc; i++)
 959                         if (!add_remote_or_group(argv[i], &list))
 960                                 die(_("No such remote or remote group: %s"), argv[i]);
 961                 result = fetch_multiple(&list);
 962         } else {
 963                 /* Single remote or group */
 964                 (void) add_remote_or_group(argv[0], &list);
 965                 if (list.nr > 1) {
 966                         /* More than one remote */
 967                         if (argc > 1)
 968                                 die(_("Fetching a group and specifying refspecs does not make sense"));
 969                         result = fetch_multiple(&list);
 970                 } else {
 971                         /* Zero or one remotes */
 972                         remote = remote_get(argv[0]);
 973                         result = fetch_one(remote, argc-1, argv+1);
 974                 }
 975         }
 976
 977         if (!result && (recurse_submodules != RECURSE_SUBMODULES_OFF)) {
 978                 const char *options[10];
 979                 int num_options = 0;
 980                 add_options_to_argv(&num_options, options);
 981                 result = fetch_populated_submodules(num_options, options,
 982                                                     submodule_prefix,
 983                                                     recurse_submodules,
 984                                                     verbosity < 0);
 985         }
 986
 987         /* All names were strdup()ed or strndup()ed */
 988         list.strdup_strings = 1;
 989         string_list_clear(&list, 0);
 990
 991         return result;
 992 }