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 #include "argv-array.h"
  18
  19 static const char * const builtin_fetch_usage[] = {
  20         "git fetch [<options>] [<repository> [<refspec>...]]",
  21         "git fetch [<options>] <group>",
  22         "git fetch --multiple [<options>] [(<repository> | <group>)...]",
  23         "git fetch --all [<options>]",
  24         NULL
  25 };
  26
  27 enum {
  28         TAGS_UNSET = 0,
  29         TAGS_DEFAULT = 1,
  30         TAGS_SET = 2
  31 };
  32
  33 static int all, append, dry_run, force, keep, multiple, prune, update_head_ok, verbosity;
  34 static int progress = -1, recurse_submodules = RECURSE_SUBMODULES_DEFAULT;
  35 static int tags = TAGS_DEFAULT;
  36 static const char *depth;
  37 static const char *upload_pack;
  38 static struct strbuf default_rla = STRBUF_INIT;
  39 static struct transport *transport;
  40 static const char *submodule_prefix = "";
  41 static const char *recurse_submodules_default;
  42
  43 static int option_parse_recurse_submodules(const struct option *opt,
  44                                    const char *arg, int unset)
  45 {
  46         if (unset) {
  47                 recurse_submodules = RECURSE_SUBMODULES_OFF;
  48         } else {
  49                 if (arg)
  50                         recurse_submodules = parse_fetch_recurse_submodules_arg(opt->long_name, arg);
  51                 else
  52                         recurse_submodules = RECURSE_SUBMODULES_ON;
  53         }
  54         return 0;
  55 }
  56
  57 static struct option builtin_fetch_options[] = {
  58         OPT__VERBOSITY(&verbosity),
  59         OPT_BOOLEAN(0, "all", &all,
  60                     "fetch from all remotes"),
  61         OPT_BOOLEAN('a', "append", &append,
  62                     "append to .git/FETCH_HEAD instead of overwriting"),
  63         OPT_STRING(0, "upload-pack", &upload_pack, "path",
  64                    "path to upload pack on remote end"),
  65         OPT__FORCE(&force, "force overwrite of local branch"),
  66         OPT_BOOLEAN('m', "multiple", &multiple,
  67                     "fetch from multiple remotes"),
  68         OPT_SET_INT('t', "tags", &tags,
  69                     "fetch all tags and associated objects", TAGS_SET),
  70         OPT_SET_INT('n', NULL, &tags,
  71                     "do not fetch all tags (--no-tags)", TAGS_UNSET),
  72         OPT_BOOLEAN('p', "prune", &prune,
  73                     "prune remote-tracking branches no longer on remote"),
  74         { OPTION_CALLBACK, 0, "recurse-submodules", NULL, "on-demand",
  75                     "control recursive fetching of submodules",
  76                     PARSE_OPT_OPTARG, option_parse_recurse_submodules },
  77         OPT_BOOLEAN(0, "dry-run", &dry_run,
  78                     "dry run"),
  79         OPT_BOOLEAN('k', "keep", &keep, "keep downloaded pack"),
  80         OPT_BOOLEAN('u', "update-head-ok", &update_head_ok,
  81                     "allow updating of HEAD ref"),
  82         OPT_BOOL(0, "progress", &progress, "force progress reporting"),
  83         OPT_STRING(0, "depth", &depth, "depth",
  84                    "deepen history of shallow clone"),
  85         { OPTION_STRING, 0, "submodule-prefix", &submodule_prefix, "dir",
  86                    "prepend this to submodule path output", PARSE_OPT_HIDDEN },
  87         { OPTION_STRING, 0, "recurse-submodules-default",
  88                    &recurse_submodules_default, NULL,
  89                    "default mode for recursion", PARSE_OPT_HIDDEN },
  90         OPT_END()
  91 };
  92
  93 static void unlock_pack(void)
  94 {
  95         if (transport)
  96                 transport_unlock_pack(transport);
  97 }
  98
  99 static void unlock_pack_on_signal(int signo)
 100 {
 101         unlock_pack();
 102         sigchain_pop(signo);
 103         raise(signo);
 104 }
 105
 106 static void add_merge_config(struct ref **head,
 107                            const struct ref *remote_refs,
 108                            struct branch *branch,
 109                            struct ref ***tail)
 110 {
 111         int i;
 112
 113         for (i = 0; i < branch->merge_nr; i++) {
 114                 struct ref *rm, **old_tail = *tail;
 115                 struct refspec refspec;
 116
 117                 for (rm = *head; rm; rm = rm->next) {
 118                         if (branch_merge_matches(branch, i, rm->name)) {
 119                                 rm->merge = 1;
 120                                 break;
 121                         }
 122                 }
 123                 if (rm)
 124                         continue;
 125
 126                 /*
 127                  * Not fetched to a remote-tracking branch?  We need to fetch
 128                  * it anyway to allow this branch's "branch.$name.merge"
 129                  * to be honored by 'git pull', but we do not have to
 130                  * fail if branch.$name.merge is misconfigured to point
 131                  * at a nonexisting branch.  If we were indeed called by
 132                  * 'git pull', it will notice the misconfiguration because
 133                  * there is no entry in the resulting FETCH_HEAD marked
 134                  * for merging.
 135                  */
 136                 memset(&refspec, 0, sizeof(refspec));
 137                 refspec.src = branch->merge[i]->src;
 138                 get_fetch_map(remote_refs, &refspec, tail, 1);
 139                 for (rm = *old_tail; rm; rm = rm->next)
 140                         rm->merge = 1;
 141         }
 142 }
 143
 144 static void find_non_local_tags(struct transport *transport,
 145                         struct ref **head,
 146                         struct ref ***tail);
 147
 148 static struct ref *get_ref_map(struct transport *transport,
 149                                struct refspec *refs, int ref_count, int tags,
 150                                int *autotags)
 151 {
 152         int i;
 153         struct ref *rm;
 154         struct ref *ref_map = NULL;
 155         struct ref **tail = &ref_map;
 156
 157         const struct ref *remote_refs = transport_get_remote_refs(transport);
 158
 159         if (ref_count || tags == TAGS_SET) {
 160                 for (i = 0; i < ref_count; i++) {
 161                         get_fetch_map(remote_refs, &refs[i], &tail, 0);
 162                         if (refs[i].dst && refs[i].dst[0])
 163                                 *autotags = 1;
 164                 }
 165                 /* Merge everything on the command line, but not --tags */
 166                 for (rm = ref_map; rm; rm = rm->next)
 167                         rm->merge = 1;
 168                 if (tags == TAGS_SET)
 169                         get_fetch_map(remote_refs, tag_refspec, &tail, 0);
 170         } else {
 171                 /* Use the defaults */
 172                 struct remote *remote = transport->remote;
 173                 struct branch *branch = branch_get(NULL);
 174                 int has_merge = branch_has_merge_config(branch);
 175                 if (remote &&
 176                     (remote->fetch_refspec_nr ||
 177                      /* Note: has_merge implies non-NULL branch->remote_name */
 178                      (has_merge && !strcmp(branch->remote_name, remote->name)))) {
 179                         for (i = 0; i < remote->fetch_refspec_nr; i++) {
 180                                 get_fetch_map(remote_refs, &remote->fetch[i], &tail, 0);
 181                                 if (remote->fetch[i].dst &&
 182                                     remote->fetch[i].dst[0])
 183                                         *autotags = 1;
 184                                 if (!i && !has_merge && ref_map &&
 185                                     !remote->fetch[0].pattern)
 186                                         ref_map->merge = 1;
 187                         }
 188                         /*
 189                          * if the remote we're fetching from is the same
 190                          * as given in branch.<name>.remote, we add the
 191                          * ref given in branch.<name>.merge, too.
 192                          *
 193                          * Note: has_merge implies non-NULL branch->remote_name
 194                          */
 195                         if (has_merge &&
 196                             !strcmp(branch->remote_name, remote->name))
 197                                 add_merge_config(&ref_map, remote_refs, branch, &tail);
 198                 } else {
 199                         ref_map = get_remote_ref(remote_refs, "HEAD");
 200                         if (!ref_map)
 201                                 die(_("Couldn't find remote ref HEAD"));
 202                         ref_map->merge = 1;
 203                         tail = &ref_map->next;
 204                 }
 205         }
 206         if (tags == TAGS_DEFAULT && *autotags)
 207                 find_non_local_tags(transport, &ref_map, &tail);
 208         ref_remove_duplicates(ref_map);
 209
 210         return ref_map;
 211 }
 212
 213 #define STORE_REF_ERROR_OTHER 1
 214 #define STORE_REF_ERROR_DF_CONFLICT 2
 215
 216 static int s_update_ref(const char *action,
 217                         struct ref *ref,
 218                         int check_old)
 219 {
 220         char msg[1024];
 221         char *rla = getenv("GIT_REFLOG_ACTION");
 222         static struct ref_lock *lock;
 223
 224         if (dry_run)
 225                 return 0;
 226         if (!rla)
 227                 rla = default_rla.buf;
 228         snprintf(msg, sizeof(msg), "%s: %s", rla, action);
 229         lock = lock_any_ref_for_update(ref->name,
 230                                        check_old ? ref->old_sha1 : NULL, 0);
 231         if (!lock)
 232                 return errno == ENOTDIR ? STORE_REF_ERROR_DF_CONFLICT :
 233                                           STORE_REF_ERROR_OTHER;
 234         if (write_ref_sha1(lock, ref->new_sha1, msg) < 0)
 235                 return errno == ENOTDIR ? STORE_REF_ERROR_DF_CONFLICT :
 236                                           STORE_REF_ERROR_OTHER;
 237         return 0;
 238 }
 239
 240 #define REFCOL_WIDTH  10
 241
 242 static int update_local_ref(struct ref *ref,
 243                             const char *remote,
 244                             const struct ref *remote_ref,
 245                             struct strbuf *display)
 246 {
 247         struct commit *current = NULL, *updated;
 248         enum object_type type;
 249         struct branch *current_branch = branch_get(NULL);
 250         const char *pretty_ref = prettify_refname(ref->name);
 251
 252         type = sha1_object_info(ref->new_sha1, NULL);
 253         if (type < 0)
 254                 die(_("object %s not found"), sha1_to_hex(ref->new_sha1));
 255
 256         if (!hashcmp(ref->old_sha1, ref->new_sha1)) {
 257                 if (verbosity > 0)
 258                         strbuf_addf(display, "= %-*s %-*s -> %s",
 259                                     TRANSPORT_SUMMARY_WIDTH,
 260                                     _("[up to date]"), REFCOL_WIDTH,
 261                                     remote, pretty_ref);
 262                 return 0;
 263         }
 264
 265         if (current_branch &&
 266             !strcmp(ref->name, current_branch->name) &&
 267             !(update_head_ok || is_bare_repository()) &&
 268             !is_null_sha1(ref->old_sha1)) {
 269                 /*
 270                  * If this is the head, and it's not okay to update
 271                  * the head, and the old value of the head isn't empty...
 272                  */
 273                 strbuf_addf(display,
 274                             _("! %-*s %-*s -> %s  (can't fetch in current branch)"),
 275                             TRANSPORT_SUMMARY_WIDTH, _("[rejected]"),
 276                             REFCOL_WIDTH, remote, pretty_ref);
 277                 return 1;
 278         }
 279
 280         if (!is_null_sha1(ref->old_sha1) &&
 281             !prefixcmp(ref->name, "refs/tags/")) {
 282                 int r;
 283                 r = s_update_ref("updating tag", ref, 0);
 284                 strbuf_addf(display, "%c %-*s %-*s -> %s%s",
 285                             r ? '!' : '-',
 286                             TRANSPORT_SUMMARY_WIDTH, _("[tag update]"),
 287                             REFCOL_WIDTH, remote, pretty_ref,
 288                             r ? _("  (unable to update local ref)") : "");
 289                 return r;
 290         }
 291
 292         current = lookup_commit_reference_gently(ref->old_sha1, 1);
 293         updated = lookup_commit_reference_gently(ref->new_sha1, 1);
 294         if (!current || !updated) {
 295                 const char *msg;
 296                 const char *what;
 297                 int r;
 298                 /*
 299                  * Nicely describe the new ref we're fetching.
 300                  * Base this on the remote's ref name, as it's
 301                  * more likely to follow a standard layout.
 302                  */
 303                 const char *name = remote_ref ? remote_ref->name : "";
 304                 if (!prefixcmp(name, "refs/tags/")) {
 305                         msg = "storing tag";
 306                         what = _("[new tag]");
 307                 } else if (!prefixcmp(name, "refs/heads/")) {
 308                         msg = "storing head";
 309                         what = _("[new branch]");
 310                 } else {
 311                         msg = "storing ref";
 312                         what = _("[new ref]");
 313                 }
 314
 315                 if ((recurse_submodules != RECURSE_SUBMODULES_OFF) &&
 316                     (recurse_submodules != RECURSE_SUBMODULES_ON))
 317                         check_for_new_submodule_commits(ref->new_sha1);
 318                 r = s_update_ref(msg, ref, 0);
 319                 strbuf_addf(display, "%c %-*s %-*s -> %s%s",
 320                             r ? '!' : '*',
 321                             TRANSPORT_SUMMARY_WIDTH, what,
 322                             REFCOL_WIDTH, remote, pretty_ref,
 323                             r ? _("  (unable to update local ref)") : "");
 324                 return r;
 325         }
 326
 327         if (in_merge_bases(current, &updated, 1)) {
 328                 char quickref[83];
 329                 int r;
 330                 strcpy(quickref, find_unique_abbrev(current->object.sha1, DEFAULT_ABBREV));
 331                 strcat(quickref, "..");
 332                 strcat(quickref, find_unique_abbrev(ref->new_sha1, DEFAULT_ABBREV));
 333                 if ((recurse_submodules != RECURSE_SUBMODULES_OFF) &&
 334                     (recurse_submodules != RECURSE_SUBMODULES_ON))
 335                         check_for_new_submodule_commits(ref->new_sha1);
 336                 r = s_update_ref("fast-forward", ref, 1);
 337                 strbuf_addf(display, "%c %-*s %-*s -> %s%s",
 338                             r ? '!' : ' ',
 339                             TRANSPORT_SUMMARY_WIDTH, quickref,
 340                             REFCOL_WIDTH, remote, pretty_ref,
 341                             r ? _("  (unable to update local ref)") : "");
 342                 return r;
 343         } else if (force || ref->force) {
 344                 char quickref[84];
 345                 int r;
 346                 strcpy(quickref, find_unique_abbrev(current->object.sha1, DEFAULT_ABBREV));
 347                 strcat(quickref, "...");
 348                 strcat(quickref, find_unique_abbrev(ref->new_sha1, DEFAULT_ABBREV));
 349                 if ((recurse_submodules != RECURSE_SUBMODULES_OFF) &&
 350                     (recurse_submodules != RECURSE_SUBMODULES_ON))
 351                         check_for_new_submodule_commits(ref->new_sha1);
 352                 r = s_update_ref("forced-update", ref, 1);
 353                 strbuf_addf(display, "%c %-*s %-*s -> %s  (%s)",
 354                             r ? '!' : '+',
 355                             TRANSPORT_SUMMARY_WIDTH, quickref,
 356                             REFCOL_WIDTH, remote, pretty_ref,
 357                             r ? _("unable to update local ref") : _("forced update"));
 358                 return r;
 359         } else {
 360                 strbuf_addf(display, "! %-*s %-*s -> %s  %s",
 361                             TRANSPORT_SUMMARY_WIDTH, _("[rejected]"),
 362                             REFCOL_WIDTH, remote, pretty_ref,
 363                             _("(non-fast-forward)"));
 364                 return 1;
 365         }
 366 }
 367
 368 static int iterate_ref_map(void *cb_data, unsigned char sha1[20])
 369 {
 370         struct ref **rm = cb_data;
 371         struct ref *ref = *rm;
 372
 373         if (!ref)
 374                 return -1; /* end of the list */
 375         *rm = ref->next;
 376         hashcpy(sha1, ref->old_sha1);
 377         return 0;
 378 }
 379
 380 static int store_updated_refs(const char *raw_url, const char *remote_name,
 381                 struct ref *ref_map)
 382 {
 383         FILE *fp;
 384         struct commit *commit;
 385         int url_len, i, shown_url = 0, rc = 0;
 386         struct strbuf note = STRBUF_INIT;
 387         const char *what, *kind;
 388         struct ref *rm;
 389         char *url, *filename = dry_run ? "/dev/null" : git_path("FETCH_HEAD");
 390         int want_merge;
 391
 392         fp = fopen(filename, "a");
 393         if (!fp)
 394                 return error(_("cannot open %s: %s\n"), filename, strerror(errno));
 395
 396         if (raw_url)
 397                 url = transport_anonymize_url(raw_url);
 398         else
 399                 url = xstrdup("foreign");
 400
 401         rm = ref_map;
 402         if (check_everything_connected(iterate_ref_map, 0, &rm)) {
 403                 rc = error(_("%s did not send all necessary objects\n"), url);
 404                 goto abort;
 405         }
 406
 407         /*
 408          * The first pass writes objects to be merged and then the
 409          * second pass writes the rest, in order to allow using
 410          * FETCH_HEAD as a refname to refer to the ref to be merged.
 411          */
 412         for (want_merge = 1; 0 <= want_merge; want_merge--) {
 413                 for (rm = ref_map; rm; rm = rm->next) {
 414                         struct ref *ref = NULL;
 415
 416                         commit = lookup_commit_reference_gently(rm->old_sha1, 1);
 417                         if (!commit)
 418                                 rm->merge = 0;
 419
 420                         if (rm->merge != want_merge)
 421                                 continue;
 422
 423                         if (rm->peer_ref) {
 424                                 ref = xcalloc(1, sizeof(*ref) + strlen(rm->peer_ref->name) + 1);
 425                                 strcpy(ref->name, rm->peer_ref->name);
 426                                 hashcpy(ref->old_sha1, rm->peer_ref->old_sha1);
 427                                 hashcpy(ref->new_sha1, rm->old_sha1);
 428                                 ref->force = rm->peer_ref->force;
 429                         }
 430
 431
 432                         if (!strcmp(rm->name, "HEAD")) {
 433                                 kind = "";
 434                                 what = "";
 435                         }
 436                         else if (!prefixcmp(rm->name, "refs/heads/")) {
 437                                 kind = "branch";
 438                                 what = rm->name + 11;
 439                         }
 440                         else if (!prefixcmp(rm->name, "refs/tags/")) {
 441                                 kind = "tag";
 442                                 what = rm->name + 10;
 443                         }
 444                         else if (!prefixcmp(rm->name, "refs/remotes/")) {
 445                                 kind = "remote-tracking branch";
 446                                 what = rm->name + 13;
 447                         }
 448                         else {
 449                                 kind = "";
 450                                 what = rm->name;
 451                         }
 452
 453                         url_len = strlen(url);
 454                         for (i = url_len - 1; url[i] == '/' && 0 <= i; i--)
 455                                 ;
 456                         url_len = i + 1;
 457                         if (4 < i && !strncmp(".git", url + i - 3, 4))
 458                                 url_len = i - 3;
 459
 460                         strbuf_reset(&note);
 461                         if (*what) {
 462                                 if (*kind)
 463                                         strbuf_addf(&note, "%s ", kind);
 464                                 strbuf_addf(&note, "'%s' of ", what);
 465                         }
 466                         fprintf(fp, "%s\t%s\t%s",
 467                                 sha1_to_hex(rm->old_sha1),
 468                                 rm->merge ? "" : "not-for-merge",
 469                                 note.buf);
 470                         for (i = 0; i < url_len; ++i)
 471                                 if ('\n' == url[i])
 472                                         fputs("\\n", fp);
 473                                 else
 474                                         fputc(url[i], fp);
 475                         fputc('\n', fp);
 476
 477                         strbuf_reset(&note);
 478                         if (ref) {
 479                                 rc |= update_local_ref(ref, what, rm, &note);
 480                                 free(ref);
 481                         } else
 482                                 strbuf_addf(&note, "* %-*s %-*s -> FETCH_HEAD",
 483                                             TRANSPORT_SUMMARY_WIDTH,
 484                                             *kind ? kind : "branch",
 485                                             REFCOL_WIDTH,
 486                                             *what ? what : "HEAD");
 487                         if (note.len) {
 488                                 if (verbosity >= 0 && !shown_url) {
 489                                         fprintf(stderr, _("From %.*s\n"),
 490                                                         url_len, url);
 491                                         shown_url = 1;
 492                                 }
 493                                 if (verbosity >= 0)
 494                                         fprintf(stderr, " %s\n", note.buf);
 495                         }
 496                 }
 497         }
 498
 499         if (rc & STORE_REF_ERROR_DF_CONFLICT)
 500                 error(_("some local refs could not be updated; try running\n"
 501                       " 'git remote prune %s' to remove any old, conflicting "
 502                       "branches"), remote_name);
 503
 504  abort:
 505         strbuf_release(&note);
 506         free(url);
 507         fclose(fp);
 508         return rc;
 509 }
 510
 511 /*
 512  * We would want to bypass the object transfer altogether if
 513  * everything we are going to fetch already exists and is connected
 514  * locally.
 515  */
 516 static int quickfetch(struct ref *ref_map)
 517 {
 518         struct ref *rm = ref_map;
 519
 520         /*
 521          * If we are deepening a shallow clone we already have these
 522          * objects reachable.  Running rev-list here will return with
 523          * a good (0) exit status and we'll bypass the fetch that we
 524          * really need to perform.  Claiming failure now will ensure
 525          * we perform the network exchange to deepen our history.
 526          */
 527         if (depth)
 528                 return -1;
 529         return check_everything_connected(iterate_ref_map, 1, &rm);
 530 }
 531
 532 static int fetch_refs(struct transport *transport, struct ref *ref_map)
 533 {
 534         int ret = quickfetch(ref_map);
 535         if (ret)
 536                 ret = transport_fetch_refs(transport, ref_map);
 537         if (!ret)
 538                 ret |= store_updated_refs(transport->url,
 539                                 transport->remote->name,
 540                                 ref_map);
 541         transport_unlock_pack(transport);
 542         return ret;
 543 }
 544
 545 static int prune_refs(struct refspec *refs, int ref_count, struct ref *ref_map)
 546 {
 547         int result = 0;
 548         struct ref *ref, *stale_refs = get_stale_heads(refs, ref_count, ref_map);
 549         const char *dangling_msg = dry_run
 550                 ? _("   (%s will become dangling)")
 551                 : _("   (%s has become dangling)");
 552
 553         for (ref = stale_refs; ref; ref = ref->next) {
 554                 if (!dry_run)
 555                         result |= delete_ref(ref->name, NULL, 0);
 556                 if (verbosity >= 0) {
 557                         fprintf(stderr, " x %-*s %-*s -> %s\n",
 558                                 TRANSPORT_SUMMARY_WIDTH, _("[deleted]"),
 559                                 REFCOL_WIDTH, _("(none)"), prettify_refname(ref->name));
 560                         warn_dangling_symref(stderr, dangling_msg, ref->name);
 561                 }
 562         }
 563         free_refs(stale_refs);
 564         return result;
 565 }
 566
 567 static int add_existing(const char *refname, const unsigned char *sha1,
 568                         int flag, void *cbdata)
 569 {
 570         struct string_list *list = (struct string_list *)cbdata;
 571         struct string_list_item *item = string_list_insert(list, refname);
 572         item->util = (void *)sha1;
 573         return 0;
 574 }
 575
 576 static int will_fetch(struct ref **head, const unsigned char *sha1)
 577 {
 578         struct ref *rm = *head;
 579         while (rm) {
 580                 if (!hashcmp(rm->old_sha1, sha1))
 581                         return 1;
 582                 rm = rm->next;
 583         }
 584         return 0;
 585 }
 586
 587 static void find_non_local_tags(struct transport *transport,
 588                         struct ref **head,
 589                         struct ref ***tail)
 590 {
 591         struct string_list existing_refs = STRING_LIST_INIT_NODUP;
 592         struct string_list remote_refs = STRING_LIST_INIT_NODUP;
 593         const struct ref *ref;
 594         struct string_list_item *item = NULL;
 595
 596         for_each_ref(add_existing, &existing_refs);
 597         for (ref = transport_get_remote_refs(transport); ref; ref = ref->next) {
 598                 if (prefixcmp(ref->name, "refs/tags/"))
 599                         continue;
 600
 601                 /*
 602                  * The peeled ref always follows the matching base
 603                  * ref, so if we see a peeled ref that we don't want
 604                  * to fetch then we can mark the ref entry in the list
 605                  * as one to ignore by setting util to NULL.
 606                  */
 607                 if (!suffixcmp(ref->name, "^{}")) {
 608                         if (item && !has_sha1_file(ref->old_sha1) &&
 609                             !will_fetch(head, ref->old_sha1) &&
 610                             !has_sha1_file(item->util) &&
 611                             !will_fetch(head, item->util))
 612                                 item->util = NULL;
 613                         item = NULL;
 614                         continue;
 615                 }
 616
 617                 /*
 618                  * If item is non-NULL here, then we previously saw a
 619                  * ref not followed by a peeled reference, so we need
 620                  * to check if it is a lightweight tag that we want to
 621                  * fetch.
 622                  */
 623                 if (item && !has_sha1_file(item->util) &&
 624                     !will_fetch(head, item->util))
 625                         item->util = NULL;
 626
 627                 item = NULL;
 628
 629                 /* skip duplicates and refs that we already have */
 630                 if (string_list_has_string(&remote_refs, ref->name) ||
 631                     string_list_has_string(&existing_refs, ref->name))
 632                         continue;
 633
 634                 item = string_list_insert(&remote_refs, ref->name);
 635                 item->util = (void *)ref->old_sha1;
 636         }
 637         string_list_clear(&existing_refs, 0);
 638
 639         /*
 640          * We may have a final lightweight tag that needs to be
 641          * checked to see if it needs fetching.
 642          */
 643         if (item && !has_sha1_file(item->util) &&
 644             !will_fetch(head, item->util))
 645                 item->util = NULL;
 646
 647         /*
 648          * For all the tags in the remote_refs string list,
 649          * add them to the list of refs to be fetched
 650          */
 651         for_each_string_list_item(item, &remote_refs) {
 652                 /* Unless we have already decided to ignore this item... */
 653                 if (item->util)
 654                 {
 655                         struct ref *rm = alloc_ref(item->string);
 656                         rm->peer_ref = alloc_ref(item->string);
 657                         hashcpy(rm->old_sha1, item->util);
 658                         **tail = rm;
 659                         *tail = &rm->next;
 660                 }
 661         }
 662
 663         string_list_clear(&remote_refs, 0);
 664 }
 665
 666 static void check_not_current_branch(struct ref *ref_map)
 667 {
 668         struct branch *current_branch = branch_get(NULL);
 669
 670         if (is_bare_repository() || !current_branch)
 671                 return;
 672
 673         for (; ref_map; ref_map = ref_map->next)
 674                 if (ref_map->peer_ref && !strcmp(current_branch->refname,
 675                                         ref_map->peer_ref->name))
 676                         die(_("Refusing to fetch into current branch %s "
 677                             "of non-bare repository"), current_branch->refname);
 678 }
 679
 680 static int truncate_fetch_head(void)
 681 {
 682         char *filename = git_path("FETCH_HEAD");
 683         FILE *fp = fopen(filename, "w");
 684
 685         if (!fp)
 686                 return error(_("cannot open %s: %s\n"), filename, strerror(errno));
 687         fclose(fp);
 688         return 0;
 689 }
 690
 691 static int do_fetch(struct transport *transport,
 692                     struct refspec *refs, int ref_count)
 693 {
 694         struct string_list existing_refs = STRING_LIST_INIT_NODUP;
 695         struct string_list_item *peer_item = NULL;
 696         struct ref *ref_map;
 697         struct ref *rm;
 698         int autotags = (transport->remote->fetch_tags == 1);
 699
 700         for_each_ref(add_existing, &existing_refs);
 701
 702         if (tags == TAGS_DEFAULT) {
 703                 if (transport->remote->fetch_tags == 2)
 704                         tags = TAGS_SET;
 705                 if (transport->remote->fetch_tags == -1)
 706                         tags = TAGS_UNSET;
 707         }
 708
 709         if (!transport->get_refs_list || !transport->fetch)
 710                 die(_("Don't know how to fetch from %s"), transport->url);
 711
 712         /* if not appending, truncate FETCH_HEAD */
 713         if (!append && !dry_run) {
 714                 int errcode = truncate_fetch_head();
 715                 if (errcode)
 716                         return errcode;
 717         }
 718
 719         ref_map = get_ref_map(transport, refs, ref_count, tags, &autotags);
 720         if (!update_head_ok)
 721                 check_not_current_branch(ref_map);
 722
 723         for (rm = ref_map; rm; rm = rm->next) {
 724                 if (rm->peer_ref) {
 725                         peer_item = string_list_lookup(&existing_refs,
 726                                                        rm->peer_ref->name);
 727                         if (peer_item)
 728                                 hashcpy(rm->peer_ref->old_sha1,
 729                                         peer_item->util);
 730                 }
 731         }
 732
 733         if (tags == TAGS_DEFAULT && autotags)
 734                 transport_set_option(transport, TRANS_OPT_FOLLOWTAGS, "1");
 735         if (fetch_refs(transport, ref_map)) {
 736                 free_refs(ref_map);
 737                 return 1;
 738         }
 739         if (prune) {
 740                 /* If --tags was specified, pretend the user gave us the canonical tags refspec */
 741                 if (tags == TAGS_SET) {
 742                         const char *tags_str = "refs/tags/*:refs/tags/*";
 743                         struct refspec *tags_refspec, *refspec;
 744
 745                         /* Copy the refspec and add the tags to it */
 746                         refspec = xcalloc(ref_count + 1, sizeof(struct refspec));
 747                         tags_refspec = parse_fetch_refspec(1, &tags_str);
 748                         memcpy(refspec, refs, ref_count * sizeof(struct refspec));
 749                         memcpy(&refspec[ref_count], tags_refspec, sizeof(struct refspec));
 750                         ref_count++;
 751
 752                         prune_refs(refspec, ref_count, ref_map);
 753
 754                         ref_count--;
 755                         /* The rest of the strings belong to fetch_one */
 756                         free_refspec(1, tags_refspec);
 757                         free(refspec);
 758                 } else if (ref_count) {
 759                         prune_refs(refs, ref_count, ref_map);
 760                 } else {
 761                         prune_refs(transport->remote->fetch, transport->remote->fetch_refspec_nr, ref_map);
 762                 }
 763         }
 764         free_refs(ref_map);
 765
 766         /* if neither --no-tags nor --tags was specified, do automated tag
 767          * following ... */
 768         if (tags == TAGS_DEFAULT && autotags) {
 769                 struct ref **tail = &ref_map;
 770                 ref_map = NULL;
 771                 find_non_local_tags(transport, &ref_map, &tail);
 772                 if (ref_map) {
 773                         transport_set_option(transport, TRANS_OPT_FOLLOWTAGS, NULL);
 774                         transport_set_option(transport, TRANS_OPT_DEPTH, "0");
 775                         fetch_refs(transport, ref_map);
 776                 }
 777                 free_refs(ref_map);
 778         }
 779
 780         return 0;
 781 }
 782
 783 static void set_option(const char *name, const char *value)
 784 {
 785         int r = transport_set_option(transport, name, value);
 786         if (r < 0)
 787                 die(_("Option \"%s\" value \"%s\" is not valid for %s"),
 788                         name, value, transport->url);
 789         if (r > 0)
 790                 warning(_("Option \"%s\" is ignored for %s\n"),
 791                         name, transport->url);
 792 }
 793
 794 static int get_one_remote_for_fetch(struct remote *remote, void *priv)
 795 {
 796         struct string_list *list = priv;
 797         if (!remote->skip_default_update)
 798                 string_list_append(list, remote->name);
 799         return 0;
 800 }
 801
 802 struct remote_group_data {
 803         const char *name;
 804         struct string_list *list;
 805 };
 806
 807 static int get_remote_group(const char *key, const char *value, void *priv)
 808 {
 809         struct remote_group_data *g = priv;
 810
 811         if (!prefixcmp(key, "remotes.") &&
 812                         !strcmp(key + 8, g->name)) {
 813                 /* split list by white space */
 814                 int space = strcspn(value, " \t\n");
 815                 while (*value) {
 816                         if (space > 1) {
 817                                 string_list_append(g->list,
 818                                                    xstrndup(value, space));
 819                         }
 820                         value += space + (value[space] != '\0');
 821                         space = strcspn(value, " \t\n");
 822                 }
 823         }
 824
 825         return 0;
 826 }
 827
 828 static int add_remote_or_group(const char *name, struct string_list *list)
 829 {
 830         int prev_nr = list->nr;
 831         struct remote_group_data g;
 832         g.name = name; g.list = list;
 833
 834         git_config(get_remote_group, &g);
 835         if (list->nr == prev_nr) {
 836                 struct remote *remote;
 837                 if (!remote_is_configured(name))
 838                         return 0;
 839                 remote = remote_get(name);
 840                 string_list_append(list, remote->name);
 841         }
 842         return 1;
 843 }
 844
 845 static void add_options_to_argv(struct argv_array *argv)
 846 {
 847         if (dry_run)
 848                 argv_array_push(argv, "--dry-run");
 849         if (prune)
 850                 argv_array_push(argv, "--prune");
 851         if (update_head_ok)
 852                 argv_array_push(argv, "--update-head-ok");
 853         if (force)
 854                 argv_array_push(argv, "--force");
 855         if (keep)
 856                 argv_array_push(argv, "--keep");
 857         if (recurse_submodules == RECURSE_SUBMODULES_ON)
 858                 argv_array_push(argv, "--recurse-submodules");
 859         else if (recurse_submodules == RECURSE_SUBMODULES_ON_DEMAND)
 860                 argv_array_push(argv, "--recurse-submodules=on-demand");
 861         if (tags == TAGS_SET)
 862                 argv_array_push(argv, "--tags");
 863         else if (tags == TAGS_UNSET)
 864                 argv_array_push(argv, "--no-tags");
 865         if (verbosity >= 2)
 866                 argv_array_push(argv, "-v");
 867         if (verbosity >= 1)
 868                 argv_array_push(argv, "-v");
 869         else if (verbosity < 0)
 870                 argv_array_push(argv, "-q");
 871
 872 }
 873
 874 static int fetch_multiple(struct string_list *list)
 875 {
 876         int i, result = 0;
 877         struct argv_array argv = ARGV_ARRAY_INIT;
 878
 879         if (!append && !dry_run) {
 880                 int errcode = truncate_fetch_head();
 881                 if (errcode)
 882                         return errcode;
 883         }
 884
 885         argv_array_pushl(&argv, "fetch", "--append", NULL);
 886         add_options_to_argv(&argv);
 887
 888         for (i = 0; i < list->nr; i++) {
 889                 const char *name = list->items[i].string;
 890                 argv_array_push(&argv, name);
 891                 if (verbosity >= 0)
 892                         printf(_("Fetching %s\n"), name);
 893                 if (run_command_v_opt(argv.argv, RUN_GIT_CMD)) {
 894                         error(_("Could not fetch %s"), name);
 895                         result = 1;
 896                 }
 897                 argv_array_pop(&argv);
 898         }
 899
 900         argv_array_clear(&argv);
 901         return result;
 902 }
 903
 904 static int fetch_one(struct remote *remote, int argc, const char **argv)
 905 {
 906         int i;
 907         static const char **refs = NULL;
 908         struct refspec *refspec;
 909         int ref_nr = 0;
 910         int exit_code;
 911
 912         if (!remote)
 913                 die(_("No remote repository specified.  Please, specify either a URL or a\n"
 914                     "remote name from which new revisions should be fetched."));
 915
 916         transport = transport_get(remote, NULL);
 917         transport_set_verbosity(transport, verbosity, progress);
 918         if (upload_pack)
 919                 set_option(TRANS_OPT_UPLOADPACK, upload_pack);
 920         if (keep)
 921                 set_option(TRANS_OPT_KEEP, "yes");
 922         if (depth)
 923                 set_option(TRANS_OPT_DEPTH, depth);
 924
 925         if (argc > 0) {
 926                 int j = 0;
 927                 refs = xcalloc(argc + 1, sizeof(const char *));
 928                 for (i = 0; i < argc; i++) {
 929                         if (!strcmp(argv[i], "tag")) {
 930                                 char *ref;
 931                                 i++;
 932                                 if (i >= argc)
 933                                         die(_("You need to specify a tag name."));
 934                                 ref = xmalloc(strlen(argv[i]) * 2 + 22);
 935                                 strcpy(ref, "refs/tags/");
 936                                 strcat(ref, argv[i]);
 937                                 strcat(ref, ":refs/tags/");
 938                                 strcat(ref, argv[i]);
 939                                 refs[j++] = ref;
 940                         } else
 941                                 refs[j++] = argv[i];
 942                 }
 943                 refs[j] = NULL;
 944                 ref_nr = j;
 945         }
 946
 947         sigchain_push_common(unlock_pack_on_signal);
 948         atexit(unlock_pack);
 949         refspec = parse_fetch_refspec(ref_nr, refs);
 950         exit_code = do_fetch(transport, refspec, ref_nr);
 951         free_refspec(ref_nr, refspec);
 952         transport_disconnect(transport);
 953         transport = NULL;
 954         return exit_code;
 955 }
 956
 957 int cmd_fetch(int argc, const char **argv, const char *prefix)
 958 {
 959         int i;
 960         struct string_list list = STRING_LIST_INIT_NODUP;
 961         struct remote *remote;
 962         int result = 0;
 963
 964         packet_trace_identity("fetch");
 965
 966         /* Record the command line for the reflog */
 967         strbuf_addstr(&default_rla, "fetch");
 968         for (i = 1; i < argc; i++)
 969                 strbuf_addf(&default_rla, " %s", argv[i]);
 970
 971         argc = parse_options(argc, argv, prefix,
 972                              builtin_fetch_options, builtin_fetch_usage, 0);
 973
 974         if (recurse_submodules != RECURSE_SUBMODULES_OFF) {
 975                 if (recurse_submodules_default) {
 976                         int arg = parse_fetch_recurse_submodules_arg("--recurse-submodules-default", recurse_submodules_default);
 977                         set_config_fetch_recurse_submodules(arg);
 978                 }
 979                 gitmodules_config();
 980                 git_config(submodule_config, NULL);
 981         }
 982
 983         if (all) {
 984                 if (argc == 1)
 985                         die(_("fetch --all does not take a repository argument"));
 986                 else if (argc > 1)
 987                         die(_("fetch --all does not make sense with refspecs"));
 988                 (void) for_each_remote(get_one_remote_for_fetch, &list);
 989                 result = fetch_multiple(&list);
 990         } else if (argc == 0) {
 991                 /* No arguments -- use default remote */
 992                 remote = remote_get(NULL);
 993                 result = fetch_one(remote, argc, argv);
 994         } else if (multiple) {
 995                 /* All arguments are assumed to be remotes or groups */
 996                 for (i = 0; i < argc; i++)
 997                         if (!add_remote_or_group(argv[i], &list))
 998                                 die(_("No such remote or remote group: %s"), argv[i]);
 999                 result = fetch_multiple(&list);
1000         } else {
1001                 /* Single remote or group */
1002                 (void) add_remote_or_group(argv[0], &list);
1003                 if (list.nr > 1) {
1004                         /* More than one remote */
1005                         if (argc > 1)
1006                                 die(_("Fetching a group and specifying refspecs does not make sense"));
1007                         result = fetch_multiple(&list);
1008                 } else {
1009                         /* Zero or one remotes */
1010                         remote = remote_get(argv[0]);
1011                         result = fetch_one(remote, argc-1, argv+1);
1012                 }
1013         }
1014
1015         if (!result && (recurse_submodules != RECURSE_SUBMODULES_OFF)) {
1016                 struct argv_array options = ARGV_ARRAY_INIT;
1017
1018                 add_options_to_argv(&options);
1019                 result = fetch_populated_submodules(&options,
1020                                                     submodule_prefix,
1021                                                     recurse_submodules,
1022                                                     verbosity < 0);
1023                 argv_array_clear(&options);
1024         }
1025
1026         /* All names were strdup()ed or strndup()ed */
1027         list.strdup_strings = 1;
1028         string_list_clear(&list, 0);
1029
1030         return result;
1031 }