git.oblomov.eu Git - git/blob - 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(_("[up to date]")),
 259                                     REFCOL_WIDTH, remote, pretty_ref);
 260                 return 0;
 261         }
 262
 263         if (current_branch &&
 264             !strcmp(ref->name, current_branch->name) &&
 265             !(update_head_ok || is_bare_repository()) &&
 266             !is_null_sha1(ref->old_sha1)) {
 267                 /*
 268                  * If this is the head, and it's not okay to update
 269                  * the head, and the old value of the head isn't empty...
 270                  */
 271                 strbuf_addf(display,
 272                             _("! %-*s %-*s -> %s  (can't fetch in current branch)"),
 273                             TRANSPORT_SUMMARY(_("[rejected]")),
 274                             REFCOL_WIDTH, remote, pretty_ref);
 275                 return 1;
 276         }
 277
 278         if (!is_null_sha1(ref->old_sha1) &&
 279             !prefixcmp(ref->name, "refs/tags/")) {
 280                 int r;
 281                 r = s_update_ref("updating tag", ref, 0);
 282                 strbuf_addf(display, "%c %-*s %-*s -> %s%s",
 283                             r ? '!' : '-',
 284                             TRANSPORT_SUMMARY(_("[tag update]")),
 285                             REFCOL_WIDTH, remote, pretty_ref,
 286                             r ? _("  (unable to update local ref)") : "");
 287                 return r;
 288         }
 289
 290         current = lookup_commit_reference_gently(ref->old_sha1, 1);
 291         updated = lookup_commit_reference_gently(ref->new_sha1, 1);
 292         if (!current || !updated) {
 293                 const char *msg;
 294                 const char *what;
 295                 int r;
 296                 /*
 297                  * Nicely describe the new ref we're fetching.
 298                  * Base this on the remote's ref name, as it's
 299                  * more likely to follow a standard layout.
 300                  */
 301                 const char *name = remote_ref ? remote_ref->name : "";
 302                 if (!prefixcmp(name, "refs/tags/")) {
 303                         msg = "storing tag";
 304                         what = _("[new tag]");
 305                 } else if (!prefixcmp(name, "refs/heads/")) {
 306                         msg = "storing head";
 307                         what = _("[new branch]");
 308                 } else {
 309                         msg = "storing ref";
 310                         what = _("[new ref]");
 311                 }
 312
 313                 if ((recurse_submodules != RECURSE_SUBMODULES_OFF) &&
 314                     (recurse_submodules != RECURSE_SUBMODULES_ON))
 315                         check_for_new_submodule_commits(ref->new_sha1);
 316                 r = s_update_ref(msg, ref, 0);
 317                 strbuf_addf(display, "%c %-*s %-*s -> %s%s",
 318                             r ? '!' : '*',
 319                             TRANSPORT_SUMMARY(what),
 320                             REFCOL_WIDTH, remote, pretty_ref,
 321                             r ? _("  (unable to update local ref)") : "");
 322                 return r;
 323         }
 324
 325         if (in_merge_bases(current, &updated, 1)) {
 326                 char quickref[83];
 327                 int r;
 328                 strcpy(quickref, find_unique_abbrev(current->object.sha1, DEFAULT_ABBREV));
 329                 strcat(quickref, "..");
 330                 strcat(quickref, find_unique_abbrev(ref->new_sha1, DEFAULT_ABBREV));
 331                 if ((recurse_submodules != RECURSE_SUBMODULES_OFF) &&
 332                     (recurse_submodules != RECURSE_SUBMODULES_ON))
 333                         check_for_new_submodule_commits(ref->new_sha1);
 334                 r = s_update_ref("fast-forward", ref, 1);
 335                 strbuf_addf(display, "%c %-*s %-*s -> %s%s",
 336                             r ? '!' : ' ',
 337                             TRANSPORT_SUMMARY_WIDTH, quickref,
 338                             REFCOL_WIDTH, remote, pretty_ref,
 339                             r ? _("  (unable to update local ref)") : "");
 340                 return r;
 341         } else if (force || ref->force) {
 342                 char quickref[84];
 343                 int r;
 344                 strcpy(quickref, find_unique_abbrev(current->object.sha1, DEFAULT_ABBREV));
 345                 strcat(quickref, "...");
 346                 strcat(quickref, find_unique_abbrev(ref->new_sha1, DEFAULT_ABBREV));
 347                 if ((recurse_submodules != RECURSE_SUBMODULES_OFF) &&
 348                     (recurse_submodules != RECURSE_SUBMODULES_ON))
 349                         check_for_new_submodule_commits(ref->new_sha1);
 350                 r = s_update_ref("forced-update", ref, 1);
 351                 strbuf_addf(display, "%c %-*s %-*s -> %s  (%s)",
 352                             r ? '!' : '+',
 353                             TRANSPORT_SUMMARY_WIDTH, quickref,
 354                             REFCOL_WIDTH, remote, pretty_ref,
 355                             r ? _("unable to update local ref") : _("forced update"));
 356                 return r;
 357         } else {
 358                 strbuf_addf(display, "! %-*s %-*s -> %s  %s",
 359                             TRANSPORT_SUMMARY(_("[rejected]")),
 360                             REFCOL_WIDTH, remote, pretty_ref,
 361                             _("(non-fast-forward)"));
 362                 return 1;
 363         }
 364 }
 365
 366 static int iterate_ref_map(void *cb_data, unsigned char sha1[20])
 367 {
 368         struct ref **rm = cb_data;
 369         struct ref *ref = *rm;
 370
 371         if (!ref)
 372                 return -1; /* end of the list */
 373         *rm = ref->next;
 374         hashcpy(sha1, ref->old_sha1);
 375         return 0;
 376 }
 377
 378 static int store_updated_refs(const char *raw_url, const char *remote_name,
 379                 struct ref *ref_map)
 380 {
 381         FILE *fp;
 382         struct commit *commit;
 383         int url_len, i, shown_url = 0, rc = 0;
 384         struct strbuf note = STRBUF_INIT;
 385         const char *what, *kind;
 386         struct ref *rm;
 387         char *url, *filename = dry_run ? "/dev/null" : git_path("FETCH_HEAD");
 388         int want_merge;
 389
 390         fp = fopen(filename, "a");
 391         if (!fp)
 392                 return error(_("cannot open %s: %s\n"), filename, strerror(errno));
 393
 394         if (raw_url)
 395                 url = transport_anonymize_url(raw_url);
 396         else
 397                 url = xstrdup("foreign");
 398
 399         rm = ref_map;
 400         if (check_everything_connected(iterate_ref_map, 0, &rm)) {
 401                 rc = error(_("%s did not send all necessary objects\n"), url);
 402                 goto abort;
 403         }
 404
 405         /*
 406          * The first pass writes objects to be merged and then the
 407          * second pass writes the rest, in order to allow using
 408          * FETCH_HEAD as a refname to refer to the ref to be merged.
 409          */
 410         for (want_merge = 1; 0 <= want_merge; want_merge--) {
 411                 for (rm = ref_map; rm; rm = rm->next) {
 412                         struct ref *ref = NULL;
 413
 414                         commit = lookup_commit_reference_gently(rm->old_sha1, 1);
 415                         if (!commit)
 416                                 rm->merge = 0;
 417
 418                         if (rm->merge != want_merge)
 419                                 continue;
 420
 421                         if (rm->peer_ref) {
 422                                 ref = xcalloc(1, sizeof(*ref) + strlen(rm->peer_ref->name) + 1);
 423                                 strcpy(ref->name, rm->peer_ref->name);
 424                                 hashcpy(ref->old_sha1, rm->peer_ref->old_sha1);
 425                                 hashcpy(ref->new_sha1, rm->old_sha1);
 426                                 ref->force = rm->peer_ref->force;
 427                         }
 428
 429
 430                         if (!strcmp(rm->name, "HEAD")) {
 431                                 kind = "";
 432                                 what = "";
 433                         }
 434                         else if (!prefixcmp(rm->name, "refs/heads/")) {
 435                                 kind = "branch";
 436                                 what = rm->name + 11;
 437                         }
 438                         else if (!prefixcmp(rm->name, "refs/tags/")) {
 439                                 kind = "tag";
 440                                 what = rm->name + 10;
 441                         }
 442                         else if (!prefixcmp(rm->name, "refs/remotes/")) {
 443                                 kind = "remote-tracking branch";
 444                                 what = rm->name + 13;
 445                         }
 446                         else {
 447                                 kind = "";
 448                                 what = rm->name;
 449                         }
 450
 451                         url_len = strlen(url);
 452                         for (i = url_len - 1; url[i] == '/' && 0 <= i; i--)
 453                                 ;
 454                         url_len = i + 1;
 455                         if (4 < i && !strncmp(".git", url + i - 3, 4))
 456                                 url_len = i - 3;
 457
 458                         strbuf_reset(&note);
 459                         if (*what) {
 460                                 if (*kind)
 461                                         strbuf_addf(&note, "%s ", kind);
 462                                 strbuf_addf(&note, "'%s' of ", what);
 463                         }
 464                         fprintf(fp, "%s\t%s\t%s",
 465                                 sha1_to_hex(rm->old_sha1),
 466                                 rm->merge ? "" : "not-for-merge",
 467                                 note.buf);
 468                         for (i = 0; i < url_len; ++i)
 469                                 if ('\n' == url[i])
 470                                         fputs("\\n", fp);
 471                                 else
 472                                         fputc(url[i], fp);
 473                         fputc('\n', fp);
 474
 475                         strbuf_reset(&note);
 476                         if (ref) {
 477                                 rc |= update_local_ref(ref, what, rm, &note);
 478                                 free(ref);
 479                         } else
 480                                 strbuf_addf(&note, "* %-*s %-*s -> FETCH_HEAD",
 481                                             TRANSPORT_SUMMARY_WIDTH,
 482                                             *kind ? kind : "branch",
 483                                             REFCOL_WIDTH,
 484                                             *what ? what : "HEAD");
 485                         if (note.len) {
 486                                 if (verbosity >= 0 && !shown_url) {
 487                                         fprintf(stderr, _("From %.*s\n"),
 488                                                         url_len, url);
 489                                         shown_url = 1;
 490                                 }
 491                                 if (verbosity >= 0)
 492                                         fprintf(stderr, " %s\n", note.buf);
 493                         }
 494                 }
 495         }
 496
 497         if (rc & STORE_REF_ERROR_DF_CONFLICT)
 498                 error(_("some local refs could not be updated; try running\n"
 499                       " 'git remote prune %s' to remove any old, conflicting "
 500                       "branches"), remote_name);
 501
 502  abort:
 503         strbuf_release(&note);
 504         free(url);
 505         fclose(fp);
 506         return rc;
 507 }
 508
 509 /*
 510  * We would want to bypass the object transfer altogether if
 511  * everything we are going to fetch already exists and is connected
 512  * locally.
 513  */
 514 static int quickfetch(struct ref *ref_map)
 515 {
 516         struct ref *rm = ref_map;
 517
 518         /*
 519          * If we are deepening a shallow clone we already have these
 520          * objects reachable.  Running rev-list here will return with
 521          * a good (0) exit status and we'll bypass the fetch that we
 522          * really need to perform.  Claiming failure now will ensure
 523          * we perform the network exchange to deepen our history.
 524          */
 525         if (depth)
 526                 return -1;
 527         return check_everything_connected(iterate_ref_map, 1, &rm);
 528 }
 529
 530 static int fetch_refs(struct transport *transport, struct ref *ref_map)
 531 {
 532         int ret = quickfetch(ref_map);
 533         if (ret)
 534                 ret = transport_fetch_refs(transport, ref_map);
 535         if (!ret)
 536                 ret |= store_updated_refs(transport->url,
 537                                 transport->remote->name,
 538                                 ref_map);
 539         transport_unlock_pack(transport);
 540         return ret;
 541 }
 542
 543 static int prune_refs(struct refspec *refs, int ref_count, struct ref *ref_map)
 544 {
 545         int result = 0;
 546         struct ref *ref, *stale_refs = get_stale_heads(refs, ref_count, ref_map);
 547         const char *dangling_msg = dry_run
 548                 ? _("   (%s will become dangling)")
 549                 : _("   (%s has become dangling)");
 550
 551         for (ref = stale_refs; ref; ref = ref->next) {
 552                 if (!dry_run)
 553                         result |= delete_ref(ref->name, NULL, 0);
 554                 if (verbosity >= 0) {
 555                         fprintf(stderr, " x %-*s %-*s -> %s\n",
 556                                 TRANSPORT_SUMMARY(_("[deleted]")),
 557                                 REFCOL_WIDTH, _("(none)"), prettify_refname(ref->name));
 558                         warn_dangling_symref(stderr, dangling_msg, ref->name);
 559                 }
 560         }
 561         free_refs(stale_refs);
 562         return result;
 563 }
 564
 565 static int add_existing(const char *refname, const unsigned char *sha1,
 566                         int flag, void *cbdata)
 567 {
 568         struct string_list *list = (struct string_list *)cbdata;
 569         struct string_list_item *item = string_list_insert(list, refname);
 570         item->util = (void *)sha1;
 571         return 0;
 572 }
 573
 574 static int will_fetch(struct ref **head, const unsigned char *sha1)
 575 {
 576         struct ref *rm = *head;
 577         while (rm) {
 578                 if (!hashcmp(rm->old_sha1, sha1))
 579                         return 1;
 580                 rm = rm->next;
 581         }
 582         return 0;
 583 }
 584
 585 static void find_non_local_tags(struct transport *transport,
 586                         struct ref **head,
 587                         struct ref ***tail)
 588 {
 589         struct string_list existing_refs = STRING_LIST_INIT_NODUP;
 590         struct string_list remote_refs = STRING_LIST_INIT_NODUP;
 591         const struct ref *ref;
 592         struct string_list_item *item = NULL;
 593
 594         for_each_ref(add_existing, &existing_refs);
 595         for (ref = transport_get_remote_refs(transport); ref; ref = ref->next) {
 596                 if (prefixcmp(ref->name, "refs/tags/"))
 597                         continue;
 598
 599                 /*
 600                  * The peeled ref always follows the matching base
 601                  * ref, so if we see a peeled ref that we don't want
 602                  * to fetch then we can mark the ref entry in the list
 603                  * as one to ignore by setting util to NULL.
 604                  */
 605                 if (!suffixcmp(ref->name, "^{}")) {
 606                         if (item && !has_sha1_file(ref->old_sha1) &&
 607                             !will_fetch(head, ref->old_sha1) &&
 608                             !has_sha1_file(item->util) &&
 609                             !will_fetch(head, item->util))
 610                                 item->util = NULL;
 611                         item = NULL;
 612                         continue;
 613                 }
 614
 615                 /*
 616                  * If item is non-NULL here, then we previously saw a
 617                  * ref not followed by a peeled reference, so we need
 618                  * to check if it is a lightweight tag that we want to
 619                  * fetch.
 620                  */
 621                 if (item && !has_sha1_file(item->util) &&
 622                     !will_fetch(head, item->util))
 623                         item->util = NULL;
 624
 625                 item = NULL;
 626
 627                 /* skip duplicates and refs that we already have */
 628                 if (string_list_has_string(&remote_refs, ref->name) ||
 629                     string_list_has_string(&existing_refs, ref->name))
 630                         continue;
 631
 632                 item = string_list_insert(&remote_refs, ref->name);
 633                 item->util = (void *)ref->old_sha1;
 634         }
 635         string_list_clear(&existing_refs, 0);
 636
 637         /*
 638          * We may have a final lightweight tag that needs to be
 639          * checked to see if it needs fetching.
 640          */
 641         if (item && !has_sha1_file(item->util) &&
 642             !will_fetch(head, item->util))
 643                 item->util = NULL;
 644
 645         /*
 646          * For all the tags in the remote_refs string list,
 647          * add them to the list of refs to be fetched
 648          */
 649         for_each_string_list_item(item, &remote_refs) {
 650                 /* Unless we have already decided to ignore this item... */
 651                 if (item->util)
 652                 {
 653                         struct ref *rm = alloc_ref(item->string);
 654                         rm->peer_ref = alloc_ref(item->string);
 655                         hashcpy(rm->old_sha1, item->util);
 656                         **tail = rm;
 657                         *tail = &rm->next;
 658                 }
 659         }
 660
 661         string_list_clear(&remote_refs, 0);
 662 }
 663
 664 static void check_not_current_branch(struct ref *ref_map)
 665 {
 666         struct branch *current_branch = branch_get(NULL);
 667
 668         if (is_bare_repository() || !current_branch)
 669                 return;
 670
 671         for (; ref_map; ref_map = ref_map->next)
 672                 if (ref_map->peer_ref && !strcmp(current_branch->refname,
 673                                         ref_map->peer_ref->name))
 674                         die(_("Refusing to fetch into current branch %s "
 675                             "of non-bare repository"), current_branch->refname);
 676 }
 677
 678 static int truncate_fetch_head(void)
 679 {
 680         char *filename = git_path("FETCH_HEAD");
 681         FILE *fp = fopen(filename, "w");
 682
 683         if (!fp)
 684                 return error(_("cannot open %s: %s\n"), filename, strerror(errno));
 685         fclose(fp);
 686         return 0;
 687 }
 688
 689 static int do_fetch(struct transport *transport,
 690                     struct refspec *refs, int ref_count)
 691 {
 692         struct string_list existing_refs = STRING_LIST_INIT_NODUP;
 693         struct string_list_item *peer_item = NULL;
 694         struct ref *ref_map;
 695         struct ref *rm;
 696         int autotags = (transport->remote->fetch_tags == 1);
 697
 698         for_each_ref(add_existing, &existing_refs);
 699
 700         if (tags == TAGS_DEFAULT) {
 701                 if (transport->remote->fetch_tags == 2)
 702                         tags = TAGS_SET;
 703                 if (transport->remote->fetch_tags == -1)
 704                         tags = TAGS_UNSET;
 705         }
 706
 707         if (!transport->get_refs_list || !transport->fetch)
 708                 die(_("Don't know how to fetch from %s"), transport->url);
 709
 710         /* if not appending, truncate FETCH_HEAD */
 711         if (!append && !dry_run) {
 712                 int errcode = truncate_fetch_head();
 713                 if (errcode)
 714                         return errcode;
 715         }
 716
 717         ref_map = get_ref_map(transport, refs, ref_count, tags, &autotags);
 718         if (!update_head_ok)
 719                 check_not_current_branch(ref_map);
 720
 721         for (rm = ref_map; rm; rm = rm->next) {
 722                 if (rm->peer_ref) {
 723                         peer_item = string_list_lookup(&existing_refs,
 724                                                        rm->peer_ref->name);
 725                         if (peer_item)
 726                                 hashcpy(rm->peer_ref->old_sha1,
 727                                         peer_item->util);
 728                 }
 729         }
 730
 731         if (tags == TAGS_DEFAULT && autotags)
 732                 transport_set_option(transport, TRANS_OPT_FOLLOWTAGS, "1");
 733         if (fetch_refs(transport, ref_map)) {
 734                 free_refs(ref_map);
 735                 return 1;
 736         }
 737         if (prune) {
 738                 /* If --tags was specified, pretend the user gave us the canonical tags refspec */
 739                 if (tags == TAGS_SET) {
 740                         const char *tags_str = "refs/tags/*:refs/tags/*";
 741                         struct refspec *tags_refspec, *refspec;
 742
 743                         /* Copy the refspec and add the tags to it */
 744                         refspec = xcalloc(ref_count + 1, sizeof(struct refspec));
 745                         tags_refspec = parse_fetch_refspec(1, &tags_str);
 746                         memcpy(refspec, refs, ref_count * sizeof(struct refspec));
 747                         memcpy(&refspec[ref_count], tags_refspec, sizeof(struct refspec));
 748                         ref_count++;
 749
 750                         prune_refs(refspec, ref_count, ref_map);
 751
 752                         ref_count--;
 753                         /* The rest of the strings belong to fetch_one */
 754                         free_refspec(1, tags_refspec);
 755                         free(refspec);
 756                 } else if (ref_count) {
 757                         prune_refs(refs, ref_count, ref_map);
 758                 } else {
 759                         prune_refs(transport->remote->fetch, transport->remote->fetch_refspec_nr, ref_map);
 760                 }
 761         }
 762         free_refs(ref_map);
 763
 764         /* if neither --no-tags nor --tags was specified, do automated tag
 765          * following ... */
 766         if (tags == TAGS_DEFAULT && autotags) {
 767                 struct ref **tail = &ref_map;
 768                 ref_map = NULL;
 769                 find_non_local_tags(transport, &ref_map, &tail);
 770                 if (ref_map) {
 771                         transport_set_option(transport, TRANS_OPT_FOLLOWTAGS, NULL);
 772                         transport_set_option(transport, TRANS_OPT_DEPTH, "0");
 773                         fetch_refs(transport, ref_map);
 774                 }
 775                 free_refs(ref_map);
 776         }
 777
 778         return 0;
 779 }
 780
 781 static void set_option(const char *name, const char *value)
 782 {
 783         int r = transport_set_option(transport, name, value);
 784         if (r < 0)
 785                 die(_("Option \"%s\" value \"%s\" is not valid for %s"),
 786                         name, value, transport->url);
 787         if (r > 0)
 788                 warning(_("Option \"%s\" is ignored for %s\n"),
 789                         name, transport->url);
 790 }
 791
 792 static int get_one_remote_for_fetch(struct remote *remote, void *priv)
 793 {
 794         struct string_list *list = priv;
 795         if (!remote->skip_default_update)
 796                 string_list_append(list, remote->name);
 797         return 0;
 798 }
 799
 800 struct remote_group_data {
 801         const char *name;
 802         struct string_list *list;
 803 };
 804
 805 static int get_remote_group(const char *key, const char *value, void *priv)
 806 {
 807         struct remote_group_data *g = priv;
 808
 809         if (!prefixcmp(key, "remotes.") &&
 810                         !strcmp(key + 8, g->name)) {
 811                 /* split list by white space */
 812                 int space = strcspn(value, " \t\n");
 813                 while (*value) {
 814                         if (space > 1) {
 815                                 string_list_append(g->list,
 816                                                    xstrndup(value, space));
 817                         }
 818                         value += space + (value[space] != '\0');
 819                         space = strcspn(value, " \t\n");
 820                 }
 821         }
 822
 823         return 0;
 824 }
 825
 826 static int add_remote_or_group(const char *name, struct string_list *list)
 827 {
 828         int prev_nr = list->nr;
 829         struct remote_group_data g;
 830         g.name = name; g.list = list;
 831
 832         git_config(get_remote_group, &g);
 833         if (list->nr == prev_nr) {
 834                 struct remote *remote;
 835                 if (!remote_is_configured(name))
 836                         return 0;
 837                 remote = remote_get(name);
 838                 string_list_append(list, remote->name);
 839         }
 840         return 1;
 841 }
 842
 843 static void add_options_to_argv(int *argc, const char **argv)
 844 {
 845         if (dry_run)
 846                 argv[(*argc)++] = "--dry-run";
 847         if (prune)
 848                 argv[(*argc)++] = "--prune";
 849         if (update_head_ok)
 850                 argv[(*argc)++] = "--update-head-ok";
 851         if (force)
 852                 argv[(*argc)++] = "--force";
 853         if (keep)
 854                 argv[(*argc)++] = "--keep";
 855         if (recurse_submodules == RECURSE_SUBMODULES_ON)
 856                 argv[(*argc)++] = "--recurse-submodules";
 857         else if (recurse_submodules == RECURSE_SUBMODULES_ON_DEMAND)
 858                 argv[(*argc)++] = "--recurse-submodules=on-demand";
 859         if (verbosity >= 2)
 860                 argv[(*argc)++] = "-v";
 861         if (verbosity >= 1)
 862                 argv[(*argc)++] = "-v";
 863         else if (verbosity < 0)
 864                 argv[(*argc)++] = "-q";
 865
 866 }
 867
 868 static int fetch_multiple(struct string_list *list)
 869 {
 870         int i, result = 0;
 871         const char *argv[12] = { "fetch", "--append" };
 872         int argc = 2;
 873
 874         add_options_to_argv(&argc, argv);
 875
 876         if (!append && !dry_run) {
 877                 int errcode = truncate_fetch_head();
 878                 if (errcode)
 879                         return errcode;
 880         }
 881
 882         for (i = 0; i < list->nr; i++) {
 883                 const char *name = list->items[i].string;
 884                 argv[argc] = name;
 885                 argv[argc + 1] = NULL;
 886                 if (verbosity >= 0)
 887                         printf(_("Fetching %s\n"), name);
 888                 if (run_command_v_opt(argv, RUN_GIT_CMD)) {
 889                         error(_("Could not fetch %s"), name);
 890                         result = 1;
 891                 }
 892         }
 893
 894         return result;
 895 }
 896
 897 static int fetch_one(struct remote *remote, int argc, const char **argv)
 898 {
 899         int i;
 900         static const char **refs = NULL;
 901         struct refspec *refspec;
 902         int ref_nr = 0;
 903         int exit_code;
 904
 905         if (!remote)
 906                 die(_("No remote repository specified.  Please, specify either a URL or a\n"
 907                     "remote name from which new revisions should be fetched."));
 908
 909         transport = transport_get(remote, NULL);
 910         transport_set_verbosity(transport, verbosity, progress);
 911         if (upload_pack)
 912                 set_option(TRANS_OPT_UPLOADPACK, upload_pack);
 913         if (keep)
 914                 set_option(TRANS_OPT_KEEP, "yes");
 915         if (depth)
 916                 set_option(TRANS_OPT_DEPTH, depth);
 917
 918         if (argc > 0) {
 919                 int j = 0;
 920                 refs = xcalloc(argc + 1, sizeof(const char *));
 921                 for (i = 0; i < argc; i++) {
 922                         if (!strcmp(argv[i], "tag")) {
 923                                 char *ref;
 924                                 i++;
 925                                 if (i >= argc)
 926                                         die(_("You need to specify a tag name."));
 927                                 ref = xmalloc(strlen(argv[i]) * 2 + 22);
 928                                 strcpy(ref, "refs/tags/");
 929                                 strcat(ref, argv[i]);
 930                                 strcat(ref, ":refs/tags/");
 931                                 strcat(ref, argv[i]);
 932                                 refs[j++] = ref;
 933                         } else
 934                                 refs[j++] = argv[i];
 935                 }
 936                 refs[j] = NULL;
 937                 ref_nr = j;
 938         }
 939
 940         sigchain_push_common(unlock_pack_on_signal);
 941         atexit(unlock_pack);
 942         refspec = parse_fetch_refspec(ref_nr, refs);
 943         exit_code = do_fetch(transport, refspec, ref_nr);
 944         free_refspec(ref_nr, refspec);
 945         transport_disconnect(transport);
 946         transport = NULL;
 947         return exit_code;
 948 }
 949
 950 int cmd_fetch(int argc, const char **argv, const char *prefix)
 951 {
 952         int i;
 953         struct string_list list = STRING_LIST_INIT_NODUP;
 954         struct remote *remote;
 955         int result = 0;
 956
 957         packet_trace_identity("fetch");
 958
 959         /* Record the command line for the reflog */
 960         strbuf_addstr(&default_rla, "fetch");
 961         for (i = 1; i < argc; i++)
 962                 strbuf_addf(&default_rla, " %s", argv[i]);
 963
 964         argc = parse_options(argc, argv, prefix,
 965                              builtin_fetch_options, builtin_fetch_usage, 0);
 966
 967         if (recurse_submodules != RECURSE_SUBMODULES_OFF) {
 968                 if (recurse_submodules_default) {
 969                         int arg = parse_fetch_recurse_submodules_arg("--recurse-submodules-default", recurse_submodules_default);
 970                         set_config_fetch_recurse_submodules(arg);
 971                 }
 972                 gitmodules_config();
 973                 git_config(submodule_config, NULL);
 974         }
 975
 976         if (all) {
 977                 if (argc == 1)
 978                         die(_("fetch --all does not take a repository argument"));
 979                 else if (argc > 1)
 980                         die(_("fetch --all does not make sense with refspecs"));
 981                 (void) for_each_remote(get_one_remote_for_fetch, &list);
 982                 result = fetch_multiple(&list);
 983         } else if (argc == 0) {
 984                 /* No arguments -- use default remote */
 985                 remote = remote_get(NULL);
 986                 result = fetch_one(remote, argc, argv);
 987         } else if (multiple) {
 988                 /* All arguments are assumed to be remotes or groups */
 989                 for (i = 0; i < argc; i++)
 990                         if (!add_remote_or_group(argv[i], &list))
 991                                 die(_("No such remote or remote group: %s"), argv[i]);
 992                 result = fetch_multiple(&list);
 993         } else {
 994                 /* Single remote or group */
 995                 (void) add_remote_or_group(argv[0], &list);
 996                 if (list.nr > 1) {
 997                         /* More than one remote */
 998                         if (argc > 1)
 999                                 die(_("Fetching a group and specifying refspecs does not make sense"));
1000                         result = fetch_multiple(&list);
1001                 } else {
1002                         /* Zero or one remotes */
1003                         remote = remote_get(argv[0]);
1004                         result = fetch_one(remote, argc-1, argv+1);
1005                 }
1006         }
1007
1008         if (!result && (recurse_submodules != RECURSE_SUBMODULES_OFF)) {
1009                 const char *options[10];
1010                 int num_options = 0;
1011                 add_options_to_argv(&num_options, options);
1012                 result = fetch_populated_submodules(num_options, options,
1013                                                     submodule_prefix,
1014                                                     recurse_submodules,
1015                                                     verbosity < 0);
1016         }
1017
1018         /* All names were strdup()ed or strndup()ed */
1019         list.strdup_strings = 1;
1020         string_list_clear(&list, 0);
1021
1022         return result;
1023 }