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                             const struct ref *remote_ref,
 244                             struct strbuf *display)
 245 {
 246         struct commit *current = NULL, *updated;
 247         enum object_type type;
 248         struct branch *current_branch = branch_get(NULL);
 249         const char *pretty_ref = prettify_refname(ref->name);
 250
 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                         strbuf_addf(display, "= %-*s %-*s -> %s",
 258                                     TRANSPORT_SUMMARY_WIDTH,
 259                                     _("[up to date]"), REFCOL_WIDTH,
 260                                     remote, pretty_ref);
 261                 return 0;
 262         }
 263
 264         if (current_branch &&
 265             !strcmp(ref->name, current_branch->name) &&
 266             !(update_head_ok || is_bare_repository()) &&
 267             !is_null_sha1(ref->old_sha1)) {
 268                 /*
 269                  * If this is the head, and it's not okay to update
 270                  * the head, and the old value of the head isn't empty...
 271                  */
 272                 strbuf_addf(display,
 273                             _("! %-*s %-*s -> %s  (can't fetch in current branch)"),
 274                             TRANSPORT_SUMMARY_WIDTH, _("[rejected]"),
 275                             REFCOL_WIDTH, remote, pretty_ref);
 276                 return 1;
 277         }
 278
 279         if (!is_null_sha1(ref->old_sha1) &&
 280             !prefixcmp(ref->name, "refs/tags/")) {
 281                 int r;
 282                 r = s_update_ref("updating tag", ref, 0);
 283                 strbuf_addf(display, "%c %-*s %-*s -> %s%s",
 284                             r ? '!' : '-',
 285                             TRANSPORT_SUMMARY_WIDTH, _("[tag update]"),
 286                             REFCOL_WIDTH, remote, pretty_ref,
 287                             r ? _("  (unable to update local ref)") : "");
 288                 return r;
 289         }
 290
 291         current = lookup_commit_reference_gently(ref->old_sha1, 1);
 292         updated = lookup_commit_reference_gently(ref->new_sha1, 1);
 293         if (!current || !updated) {
 294                 const char *msg;
 295                 const char *what;
 296                 int r;
 297                 if (!strncmp(ref->name, "refs/tags/", 10)) {
 298                         msg = "storing tag";
 299                         what = _("[new tag]");
 300                 }
 301                 else {
 302                         msg = "storing head";
 303                         what = _("[new branch]");
 304                         if ((recurse_submodules != RECURSE_SUBMODULES_OFF) &&
 305                             (recurse_submodules != RECURSE_SUBMODULES_ON))
 306                                 check_for_new_submodule_commits(ref->new_sha1);
 307                 }
 308
 309                 r = s_update_ref(msg, ref, 0);
 310                 strbuf_addf(display, "%c %-*s %-*s -> %s%s",
 311                             r ? '!' : '*',
 312                             TRANSPORT_SUMMARY_WIDTH, what,
 313                             REFCOL_WIDTH, remote, pretty_ref,
 314                             r ? _("  (unable to update local ref)") : "");
 315                 return r;
 316         }
 317
 318         if (in_merge_bases(current, &updated, 1)) {
 319                 char quickref[83];
 320                 int r;
 321                 strcpy(quickref, find_unique_abbrev(current->object.sha1, DEFAULT_ABBREV));
 322                 strcat(quickref, "..");
 323                 strcat(quickref, find_unique_abbrev(ref->new_sha1, DEFAULT_ABBREV));
 324                 if ((recurse_submodules != RECURSE_SUBMODULES_OFF) &&
 325                     (recurse_submodules != RECURSE_SUBMODULES_ON))
 326                         check_for_new_submodule_commits(ref->new_sha1);
 327                 r = s_update_ref("fast-forward", ref, 1);
 328                 strbuf_addf(display, "%c %-*s %-*s -> %s%s",
 329                             r ? '!' : ' ',
 330                             TRANSPORT_SUMMARY_WIDTH, quickref,
 331                             REFCOL_WIDTH, remote, pretty_ref,
 332                             r ? _("  (unable to update local ref)") : "");
 333                 return r;
 334         } else if (force || ref->force) {
 335                 char quickref[84];
 336                 int r;
 337                 strcpy(quickref, find_unique_abbrev(current->object.sha1, DEFAULT_ABBREV));
 338                 strcat(quickref, "...");
 339                 strcat(quickref, find_unique_abbrev(ref->new_sha1, DEFAULT_ABBREV));
 340                 if ((recurse_submodules != RECURSE_SUBMODULES_OFF) &&
 341                     (recurse_submodules != RECURSE_SUBMODULES_ON))
 342                         check_for_new_submodule_commits(ref->new_sha1);
 343                 r = s_update_ref("forced-update", ref, 1);
 344                 strbuf_addf(display, "%c %-*s %-*s -> %s  (%s)",
 345                             r ? '!' : '+',
 346                             TRANSPORT_SUMMARY_WIDTH, quickref,
 347                             REFCOL_WIDTH, remote, pretty_ref,
 348                             r ? _("unable to update local ref") : _("forced update"));
 349                 return r;
 350         } else {
 351                 strbuf_addf(display, "! %-*s %-*s -> %s  %s",
 352                             TRANSPORT_SUMMARY_WIDTH, _("[rejected]"),
 353                             REFCOL_WIDTH, remote, pretty_ref,
 354                             _("(non-fast-forward)"));
 355                 return 1;
 356         }
 357 }
 358
 359 static int iterate_ref_map(void *cb_data, unsigned char sha1[20])
 360 {
 361         struct ref **rm = cb_data;
 362         struct ref *ref = *rm;
 363
 364         if (!ref)
 365                 return -1; /* end of the list */
 366         *rm = ref->next;
 367         hashcpy(sha1, ref->old_sha1);
 368         return 0;
 369 }
 370
 371 static int store_updated_refs(const char *raw_url, const char *remote_name,
 372                 struct ref *ref_map)
 373 {
 374         FILE *fp;
 375         struct commit *commit;
 376         int url_len, i, shown_url = 0, rc = 0;
 377         struct strbuf note = STRBUF_INIT;
 378         const char *what, *kind;
 379         struct ref *rm;
 380         char *url, *filename = dry_run ? "/dev/null" : git_path("FETCH_HEAD");
 381         int want_merge;
 382
 383         fp = fopen(filename, "a");
 384         if (!fp)
 385                 return error(_("cannot open %s: %s\n"), filename, strerror(errno));
 386
 387         if (raw_url)
 388                 url = transport_anonymize_url(raw_url);
 389         else
 390                 url = xstrdup("foreign");
 391
 392         rm = ref_map;
 393         if (check_everything_connected(iterate_ref_map, 0, &rm)) {
 394                 rc = error(_("%s did not send all necessary objects\n"), url);
 395                 goto abort;
 396         }
 397
 398         /*
 399          * The first pass writes objects to be merged and then the
 400          * second pass writes the rest, in order to allow using
 401          * FETCH_HEAD as a refname to refer to the ref to be merged.
 402          */
 403         for (want_merge = 1; 0 <= want_merge; want_merge--) {
 404                 for (rm = ref_map; rm; rm = rm->next) {
 405                         struct ref *ref = NULL;
 406
 407                         commit = lookup_commit_reference_gently(rm->old_sha1, 1);
 408                         if (!commit)
 409                                 rm->merge = 0;
 410
 411                         if (rm->merge != want_merge)
 412                                 continue;
 413
 414                         if (rm->peer_ref) {
 415                                 ref = xcalloc(1, sizeof(*ref) + strlen(rm->peer_ref->name) + 1);
 416                                 strcpy(ref->name, rm->peer_ref->name);
 417                                 hashcpy(ref->old_sha1, rm->peer_ref->old_sha1);
 418                                 hashcpy(ref->new_sha1, rm->old_sha1);
 419                                 ref->force = rm->peer_ref->force;
 420                         }
 421
 422
 423                         if (!strcmp(rm->name, "HEAD")) {
 424                                 kind = "";
 425                                 what = "";
 426                         }
 427                         else if (!prefixcmp(rm->name, "refs/heads/")) {
 428                                 kind = "branch";
 429                                 what = rm->name + 11;
 430                         }
 431                         else if (!prefixcmp(rm->name, "refs/tags/")) {
 432                                 kind = "tag";
 433                                 what = rm->name + 10;
 434                         }
 435                         else if (!prefixcmp(rm->name, "refs/remotes/")) {
 436                                 kind = "remote-tracking branch";
 437                                 what = rm->name + 13;
 438                         }
 439                         else {
 440                                 kind = "";
 441                                 what = rm->name;
 442                         }
 443
 444                         url_len = strlen(url);
 445                         for (i = url_len - 1; url[i] == '/' && 0 <= i; i--)
 446                                 ;
 447                         url_len = i + 1;
 448                         if (4 < i && !strncmp(".git", url + i - 3, 4))
 449                                 url_len = i - 3;
 450
 451                         strbuf_reset(&note);
 452                         if (*what) {
 453                                 if (*kind)
 454                                         strbuf_addf(&note, "%s ", kind);
 455                                 strbuf_addf(&note, "'%s' of ", what);
 456                         }
 457                         fprintf(fp, "%s\t%s\t%s",
 458                                 sha1_to_hex(rm->old_sha1),
 459                                 rm->merge ? "" : "not-for-merge",
 460                                 note.buf);
 461                         for (i = 0; i < url_len; ++i)
 462                                 if ('\n' == url[i])
 463                                         fputs("\\n", fp);
 464                                 else
 465                                         fputc(url[i], fp);
 466                         fputc('\n', fp);
 467
 468                         strbuf_reset(&note);
 469                         if (ref) {
 470                                 rc |= update_local_ref(ref, what, rm, &note);
 471                                 free(ref);
 472                         } else
 473                                 strbuf_addf(&note, "* %-*s %-*s -> FETCH_HEAD",
 474                                             TRANSPORT_SUMMARY_WIDTH,
 475                                             *kind ? kind : "branch",
 476                                             REFCOL_WIDTH,
 477                                             *what ? what : "HEAD");
 478                         if (note.len) {
 479                                 if (verbosity >= 0 && !shown_url) {
 480                                         fprintf(stderr, _("From %.*s\n"),
 481                                                         url_len, url);
 482                                         shown_url = 1;
 483                                 }
 484                                 if (verbosity >= 0)
 485                                         fprintf(stderr, " %s\n", note.buf);
 486                         }
 487                 }
 488         }
 489
 490         if (rc & STORE_REF_ERROR_DF_CONFLICT)
 491                 error(_("some local refs could not be updated; try running\n"
 492                       " 'git remote prune %s' to remove any old, conflicting "
 493                       "branches"), remote_name);
 494
 495  abort:
 496         strbuf_release(&note);
 497         free(url);
 498         fclose(fp);
 499         return rc;
 500 }
 501
 502 /*
 503  * We would want to bypass the object transfer altogether if
 504  * everything we are going to fetch already exists and is connected
 505  * locally.
 506  */
 507 static int quickfetch(struct ref *ref_map)
 508 {
 509         struct ref *rm = ref_map;
 510
 511         /*
 512          * If we are deepening a shallow clone we already have these
 513          * objects reachable.  Running rev-list here will return with
 514          * a good (0) exit status and we'll bypass the fetch that we
 515          * really need to perform.  Claiming failure now will ensure
 516          * we perform the network exchange to deepen our history.
 517          */
 518         if (depth)
 519                 return -1;
 520         return check_everything_connected(iterate_ref_map, 1, &rm);
 521 }
 522
 523 static int fetch_refs(struct transport *transport, struct ref *ref_map)
 524 {
 525         int ret = quickfetch(ref_map);
 526         if (ret)
 527                 ret = transport_fetch_refs(transport, ref_map);
 528         if (!ret)
 529                 ret |= store_updated_refs(transport->url,
 530                                 transport->remote->name,
 531                                 ref_map);
 532         transport_unlock_pack(transport);
 533         return ret;
 534 }
 535
 536 static int prune_refs(struct refspec *refs, int ref_count, struct ref *ref_map)
 537 {
 538         int result = 0;
 539         struct ref *ref, *stale_refs = get_stale_heads(refs, ref_count, ref_map);
 540         const char *dangling_msg = dry_run
 541                 ? _("   (%s will become dangling)\n")
 542                 : _("   (%s has become dangling)\n");
 543
 544         for (ref = stale_refs; ref; ref = ref->next) {
 545                 if (!dry_run)
 546                         result |= delete_ref(ref->name, NULL, 0);
 547                 if (verbosity >= 0) {
 548                         fprintf(stderr, " x %-*s %-*s -> %s\n",
 549                                 TRANSPORT_SUMMARY_WIDTH, _("[deleted]"),
 550                                 REFCOL_WIDTH, _("(none)"), prettify_refname(ref->name));
 551                         warn_dangling_symref(stderr, dangling_msg, ref->name);
 552                 }
 553         }
 554         free_refs(stale_refs);
 555         return result;
 556 }
 557
 558 static int add_existing(const char *refname, const unsigned char *sha1,
 559                         int flag, void *cbdata)
 560 {
 561         struct string_list *list = (struct string_list *)cbdata;
 562         struct string_list_item *item = string_list_insert(list, refname);
 563         item->util = (void *)sha1;
 564         return 0;
 565 }
 566
 567 static int will_fetch(struct ref **head, const unsigned char *sha1)
 568 {
 569         struct ref *rm = *head;
 570         while (rm) {
 571                 if (!hashcmp(rm->old_sha1, sha1))
 572                         return 1;
 573                 rm = rm->next;
 574         }
 575         return 0;
 576 }
 577
 578 static void find_non_local_tags(struct transport *transport,
 579                         struct ref **head,
 580                         struct ref ***tail)
 581 {
 582         struct string_list existing_refs = STRING_LIST_INIT_NODUP;
 583         struct string_list remote_refs = STRING_LIST_INIT_NODUP;
 584         const struct ref *ref;
 585         struct string_list_item *item = NULL;
 586
 587         for_each_ref(add_existing, &existing_refs);
 588         for (ref = transport_get_remote_refs(transport); ref; ref = ref->next) {
 589                 if (prefixcmp(ref->name, "refs/tags"))
 590                         continue;
 591
 592                 /*
 593                  * The peeled ref always follows the matching base
 594                  * ref, so if we see a peeled ref that we don't want
 595                  * to fetch then we can mark the ref entry in the list
 596                  * as one to ignore by setting util to NULL.
 597                  */
 598                 if (!suffixcmp(ref->name, "^{}")) {
 599                         if (item && !has_sha1_file(ref->old_sha1) &&
 600                             !will_fetch(head, ref->old_sha1) &&
 601                             !has_sha1_file(item->util) &&
 602                             !will_fetch(head, item->util))
 603                                 item->util = NULL;
 604                         item = NULL;
 605                         continue;
 606                 }
 607
 608                 /*
 609                  * If item is non-NULL here, then we previously saw a
 610                  * ref not followed by a peeled reference, so we need
 611                  * to check if it is a lightweight tag that we want to
 612                  * fetch.
 613                  */
 614                 if (item && !has_sha1_file(item->util) &&
 615                     !will_fetch(head, item->util))
 616                         item->util = NULL;
 617
 618                 item = NULL;
 619
 620                 /* skip duplicates and refs that we already have */
 621                 if (string_list_has_string(&remote_refs, ref->name) ||
 622                     string_list_has_string(&existing_refs, ref->name))
 623                         continue;
 624
 625                 item = string_list_insert(&remote_refs, ref->name);
 626                 item->util = (void *)ref->old_sha1;
 627         }
 628         string_list_clear(&existing_refs, 0);
 629
 630         /*
 631          * We may have a final lightweight tag that needs to be
 632          * checked to see if it needs fetching.
 633          */
 634         if (item && !has_sha1_file(item->util) &&
 635             !will_fetch(head, item->util))
 636                 item->util = NULL;
 637
 638         /*
 639          * For all the tags in the remote_refs string list,
 640          * add them to the list of refs to be fetched
 641          */
 642         for_each_string_list_item(item, &remote_refs) {
 643                 /* Unless we have already decided to ignore this item... */
 644                 if (item->util)
 645                 {
 646                         struct ref *rm = alloc_ref(item->string);
 647                         rm->peer_ref = alloc_ref(item->string);
 648                         hashcpy(rm->old_sha1, item->util);
 649                         **tail = rm;
 650                         *tail = &rm->next;
 651                 }
 652         }
 653
 654         string_list_clear(&remote_refs, 0);
 655 }
 656
 657 static void check_not_current_branch(struct ref *ref_map)
 658 {
 659         struct branch *current_branch = branch_get(NULL);
 660
 661         if (is_bare_repository() || !current_branch)
 662                 return;
 663
 664         for (; ref_map; ref_map = ref_map->next)
 665                 if (ref_map->peer_ref && !strcmp(current_branch->refname,
 666                                         ref_map->peer_ref->name))
 667                         die(_("Refusing to fetch into current branch %s "
 668                             "of non-bare repository"), current_branch->refname);
 669 }
 670
 671 static int truncate_fetch_head(void)
 672 {
 673         char *filename = git_path("FETCH_HEAD");
 674         FILE *fp = fopen(filename, "w");
 675
 676         if (!fp)
 677                 return error(_("cannot open %s: %s\n"), filename, strerror(errno));
 678         fclose(fp);
 679         return 0;
 680 }
 681
 682 static int do_fetch(struct transport *transport,
 683                     struct refspec *refs, int ref_count)
 684 {
 685         struct string_list existing_refs = STRING_LIST_INIT_NODUP;
 686         struct string_list_item *peer_item = NULL;
 687         struct ref *ref_map;
 688         struct ref *rm;
 689         int autotags = (transport->remote->fetch_tags == 1);
 690
 691         for_each_ref(add_existing, &existing_refs);
 692
 693         if (tags == TAGS_DEFAULT) {
 694                 if (transport->remote->fetch_tags == 2)
 695                         tags = TAGS_SET;
 696                 if (transport->remote->fetch_tags == -1)
 697                         tags = TAGS_UNSET;
 698         }
 699
 700         if (!transport->get_refs_list || !transport->fetch)
 701                 die(_("Don't know how to fetch from %s"), transport->url);
 702
 703         /* if not appending, truncate FETCH_HEAD */
 704         if (!append && !dry_run) {
 705                 int errcode = truncate_fetch_head();
 706                 if (errcode)
 707                         return errcode;
 708         }
 709
 710         ref_map = get_ref_map(transport, refs, ref_count, tags, &autotags);
 711         if (!update_head_ok)
 712                 check_not_current_branch(ref_map);
 713
 714         for (rm = ref_map; rm; rm = rm->next) {
 715                 if (rm->peer_ref) {
 716                         peer_item = string_list_lookup(&existing_refs,
 717                                                        rm->peer_ref->name);
 718                         if (peer_item)
 719                                 hashcpy(rm->peer_ref->old_sha1,
 720                                         peer_item->util);
 721                 }
 722         }
 723
 724         if (tags == TAGS_DEFAULT && autotags)
 725                 transport_set_option(transport, TRANS_OPT_FOLLOWTAGS, "1");
 726         if (fetch_refs(transport, ref_map)) {
 727                 free_refs(ref_map);
 728                 return 1;
 729         }
 730         if (prune) {
 731                 /* If --tags was specified, pretend the user gave us the canonical tags refspec */
 732                 if (tags == TAGS_SET) {
 733                         const char *tags_str = "refs/tags/*:refs/tags/*";
 734                         struct refspec *tags_refspec, *refspec;
 735
 736                         /* Copy the refspec and add the tags to it */
 737                         refspec = xcalloc(ref_count + 1, sizeof(struct refspec));
 738                         tags_refspec = parse_fetch_refspec(1, &tags_str);
 739                         memcpy(refspec, refs, ref_count * sizeof(struct refspec));
 740                         memcpy(&refspec[ref_count], tags_refspec, sizeof(struct refspec));
 741                         ref_count++;
 742
 743                         prune_refs(refspec, ref_count, ref_map);
 744
 745                         ref_count--;
 746                         /* The rest of the strings belong to fetch_one */
 747                         free_refspec(1, tags_refspec);
 748                         free(refspec);
 749                 } else if (ref_count) {
 750                         prune_refs(refs, ref_count, ref_map);
 751                 } else {
 752                         prune_refs(transport->remote->fetch, transport->remote->fetch_refspec_nr, ref_map);
 753                 }
 754         }
 755         free_refs(ref_map);
 756
 757         /* if neither --no-tags nor --tags was specified, do automated tag
 758          * following ... */
 759         if (tags == TAGS_DEFAULT && autotags) {
 760                 struct ref **tail = &ref_map;
 761                 ref_map = NULL;
 762                 find_non_local_tags(transport, &ref_map, &tail);
 763                 if (ref_map) {
 764                         transport_set_option(transport, TRANS_OPT_FOLLOWTAGS, NULL);
 765                         transport_set_option(transport, TRANS_OPT_DEPTH, "0");
 766                         fetch_refs(transport, ref_map);
 767                 }
 768                 free_refs(ref_map);
 769         }
 770
 771         return 0;
 772 }
 773
 774 static void set_option(const char *name, const char *value)
 775 {
 776         int r = transport_set_option(transport, name, value);
 777         if (r < 0)
 778                 die(_("Option \"%s\" value \"%s\" is not valid for %s"),
 779                         name, value, transport->url);
 780         if (r > 0)
 781                 warning(_("Option \"%s\" is ignored for %s\n"),
 782                         name, transport->url);
 783 }
 784
 785 static int get_one_remote_for_fetch(struct remote *remote, void *priv)
 786 {
 787         struct string_list *list = priv;
 788         if (!remote->skip_default_update)
 789                 string_list_append(list, remote->name);
 790         return 0;
 791 }
 792
 793 struct remote_group_data {
 794         const char *name;
 795         struct string_list *list;
 796 };
 797
 798 static int get_remote_group(const char *key, const char *value, void *priv)
 799 {
 800         struct remote_group_data *g = priv;
 801
 802         if (!prefixcmp(key, "remotes.") &&
 803                         !strcmp(key + 8, g->name)) {
 804                 /* split list by white space */
 805                 int space = strcspn(value, " \t\n");
 806                 while (*value) {
 807                         if (space > 1) {
 808                                 string_list_append(g->list,
 809                                                    xstrndup(value, space));
 810                         }
 811                         value += space + (value[space] != '\0');
 812                         space = strcspn(value, " \t\n");
 813                 }
 814         }
 815
 816         return 0;
 817 }
 818
 819 static int add_remote_or_group(const char *name, struct string_list *list)
 820 {
 821         int prev_nr = list->nr;
 822         struct remote_group_data g;
 823         g.name = name; g.list = list;
 824
 825         git_config(get_remote_group, &g);
 826         if (list->nr == prev_nr) {
 827                 struct remote *remote;
 828                 if (!remote_is_configured(name))
 829                         return 0;
 830                 remote = remote_get(name);
 831                 string_list_append(list, remote->name);
 832         }
 833         return 1;
 834 }
 835
 836 static void add_options_to_argv(int *argc, const char **argv)
 837 {
 838         if (dry_run)
 839                 argv[(*argc)++] = "--dry-run";
 840         if (prune)
 841                 argv[(*argc)++] = "--prune";
 842         if (update_head_ok)
 843                 argv[(*argc)++] = "--update-head-ok";
 844         if (force)
 845                 argv[(*argc)++] = "--force";
 846         if (keep)
 847                 argv[(*argc)++] = "--keep";
 848         if (recurse_submodules == RECURSE_SUBMODULES_ON)
 849                 argv[(*argc)++] = "--recurse-submodules";
 850         else if (recurse_submodules == RECURSE_SUBMODULES_ON_DEMAND)
 851                 argv[(*argc)++] = "--recurse-submodules=on-demand";
 852         if (verbosity >= 2)
 853                 argv[(*argc)++] = "-v";
 854         if (verbosity >= 1)
 855                 argv[(*argc)++] = "-v";
 856         else if (verbosity < 0)
 857                 argv[(*argc)++] = "-q";
 858
 859 }
 860
 861 static int fetch_multiple(struct string_list *list)
 862 {
 863         int i, result = 0;
 864         const char *argv[12] = { "fetch", "--append" };
 865         int argc = 2;
 866
 867         add_options_to_argv(&argc, argv);
 868
 869         if (!append && !dry_run) {
 870                 int errcode = truncate_fetch_head();
 871                 if (errcode)
 872                         return errcode;
 873         }
 874
 875         for (i = 0; i < list->nr; i++) {
 876                 const char *name = list->items[i].string;
 877                 argv[argc] = name;
 878                 argv[argc + 1] = NULL;
 879                 if (verbosity >= 0)
 880                         printf(_("Fetching %s\n"), name);
 881                 if (run_command_v_opt(argv, RUN_GIT_CMD)) {
 882                         error(_("Could not fetch %s"), name);
 883                         result = 1;
 884                 }
 885         }
 886
 887         return result;
 888 }
 889
 890 static int fetch_one(struct remote *remote, int argc, const char **argv)
 891 {
 892         int i;
 893         static const char **refs = NULL;
 894         struct refspec *refspec;
 895         int ref_nr = 0;
 896         int exit_code;
 897
 898         if (!remote)
 899                 die(_("No remote repository specified.  Please, specify either a URL or a\n"
 900                     "remote name from which new revisions should be fetched."));
 901
 902         transport = transport_get(remote, NULL);
 903         transport_set_verbosity(transport, verbosity, progress);
 904         if (upload_pack)
 905                 set_option(TRANS_OPT_UPLOADPACK, upload_pack);
 906         if (keep)
 907                 set_option(TRANS_OPT_KEEP, "yes");
 908         if (depth)
 909                 set_option(TRANS_OPT_DEPTH, depth);
 910
 911         if (argc > 0) {
 912                 int j = 0;
 913                 refs = xcalloc(argc + 1, sizeof(const char *));
 914                 for (i = 0; i < argc; i++) {
 915                         if (!strcmp(argv[i], "tag")) {
 916                                 char *ref;
 917                                 i++;
 918                                 if (i >= argc)
 919                                         die(_("You need to specify a tag name."));
 920                                 ref = xmalloc(strlen(argv[i]) * 2 + 22);
 921                                 strcpy(ref, "refs/tags/");
 922                                 strcat(ref, argv[i]);
 923                                 strcat(ref, ":refs/tags/");
 924                                 strcat(ref, argv[i]);
 925                                 refs[j++] = ref;
 926                         } else
 927                                 refs[j++] = argv[i];
 928                 }
 929                 refs[j] = NULL;
 930                 ref_nr = j;
 931         }
 932
 933         sigchain_push_common(unlock_pack_on_signal);
 934         atexit(unlock_pack);
 935         refspec = parse_fetch_refspec(ref_nr, refs);
 936         exit_code = do_fetch(transport, refspec, ref_nr);
 937         free_refspec(ref_nr, refspec);
 938         transport_disconnect(transport);
 939         transport = NULL;
 940         return exit_code;
 941 }
 942
 943 int cmd_fetch(int argc, const char **argv, const char *prefix)
 944 {
 945         int i;
 946         struct string_list list = STRING_LIST_INIT_NODUP;
 947         struct remote *remote;
 948         int result = 0;
 949
 950         packet_trace_identity("fetch");
 951
 952         /* Record the command line for the reflog */
 953         strbuf_addstr(&default_rla, "fetch");
 954         for (i = 1; i < argc; i++)
 955                 strbuf_addf(&default_rla, " %s", argv[i]);
 956
 957         argc = parse_options(argc, argv, prefix,
 958                              builtin_fetch_options, builtin_fetch_usage, 0);
 959
 960         if (recurse_submodules != RECURSE_SUBMODULES_OFF) {
 961                 if (recurse_submodules_default) {
 962                         int arg = parse_fetch_recurse_submodules_arg("--recurse-submodules-default", recurse_submodules_default);
 963                         set_config_fetch_recurse_submodules(arg);
 964                 }
 965                 gitmodules_config();
 966                 git_config(submodule_config, NULL);
 967         }
 968
 969         if (all) {
 970                 if (argc == 1)
 971                         die(_("fetch --all does not take a repository argument"));
 972                 else if (argc > 1)
 973                         die(_("fetch --all does not make sense with refspecs"));
 974                 (void) for_each_remote(get_one_remote_for_fetch, &list);
 975                 result = fetch_multiple(&list);
 976         } else if (argc == 0) {
 977                 /* No arguments -- use default remote */
 978                 remote = remote_get(NULL);
 979                 result = fetch_one(remote, argc, argv);
 980         } else if (multiple) {
 981                 /* All arguments are assumed to be remotes or groups */
 982                 for (i = 0; i < argc; i++)
 983                         if (!add_remote_or_group(argv[i], &list))
 984                                 die(_("No such remote or remote group: %s"), argv[i]);
 985                 result = fetch_multiple(&list);
 986         } else {
 987                 /* Single remote or group */
 988                 (void) add_remote_or_group(argv[0], &list);
 989                 if (list.nr > 1) {
 990                         /* More than one remote */
 991                         if (argc > 1)
 992                                 die(_("Fetching a group and specifying refspecs does not make sense"));
 993                         result = fetch_multiple(&list);
 994                 } else {
 995                         /* Zero or one remotes */
 996                         remote = remote_get(argv[0]);
 997                         result = fetch_one(remote, argc-1, argv+1);
 998                 }
 999         }
1000
1001         if (!result && (recurse_submodules != RECURSE_SUBMODULES_OFF)) {
1002                 const char *options[10];
1003                 int num_options = 0;
1004                 add_options_to_argv(&num_options, options);
1005                 result = fetch_populated_submodules(num_options, options,
1006                                                     submodule_prefix,
1007                                                     recurse_submodules,
1008                                                     verbosity < 0);
1009         }
1010
1011         /* All names were strdup()ed or strndup()ed */
1012         list.strdup_strings = 1;
1013         string_list_clear(&list, 0);
1014
1015         return result;
1016 }