Pileus Git - ~andy/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 #include "argv-array.h"
  18
  19 static const char * const builtin_fetch_usage[] = {
  20         N_("git fetch [<options>] [<repository> [<refspec>...]]"),
  21         N_("git fetch [<options>] <group>"),
  22         N_("git fetch --multiple [<options>] [(<repository> | <group>)...]"),
  23         N_("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, unshallow;
  36 static const char *depth;
  37 static const char *upload_pack;
  38 static struct strbuf default_rla = STRBUF_INIT;
  39 static struct transport *gtransport;
  40 static struct transport *gsecondary;
  41 static const char *submodule_prefix = "";
  42 static const char *recurse_submodules_default;
  43
  44 static int option_parse_recurse_submodules(const struct option *opt,
  45                                    const char *arg, int unset)
  46 {
  47         if (unset) {
  48                 recurse_submodules = RECURSE_SUBMODULES_OFF;
  49         } else {
  50                 if (arg)
  51                         recurse_submodules = parse_fetch_recurse_submodules_arg(opt->long_name, arg);
  52                 else
  53                         recurse_submodules = RECURSE_SUBMODULES_ON;
  54         }
  55         return 0;
  56 }
  57
  58 static struct option builtin_fetch_options[] = {
  59         OPT__VERBOSITY(&verbosity),
  60         OPT_BOOLEAN(0, "all", &all,
  61                     N_("fetch from all remotes")),
  62         OPT_BOOLEAN('a', "append", &append,
  63                     N_("append to .git/FETCH_HEAD instead of overwriting")),
  64         OPT_STRING(0, "upload-pack", &upload_pack, N_("path"),
  65                    N_("path to upload pack on remote end")),
  66         OPT__FORCE(&force, N_("force overwrite of local branch")),
  67         OPT_BOOLEAN('m', "multiple", &multiple,
  68                     N_("fetch from multiple remotes")),
  69         OPT_SET_INT('t', "tags", &tags,
  70                     N_("fetch all tags and associated objects"), TAGS_SET),
  71         OPT_SET_INT('n', NULL, &tags,
  72                     N_("do not fetch all tags (--no-tags)"), TAGS_UNSET),
  73         OPT_BOOLEAN('p', "prune", &prune,
  74                     N_("prune remote-tracking branches no longer on remote")),
  75         { OPTION_CALLBACK, 0, "recurse-submodules", NULL, N_("on-demand"),
  76                     N_("control recursive fetching of submodules"),
  77                     PARSE_OPT_OPTARG, option_parse_recurse_submodules },
  78         OPT_BOOLEAN(0, "dry-run", &dry_run,
  79                     N_("dry run")),
  80         OPT_BOOLEAN('k', "keep", &keep, N_("keep downloaded pack")),
  81         OPT_BOOLEAN('u', "update-head-ok", &update_head_ok,
  82                     N_("allow updating of HEAD ref")),
  83         OPT_BOOL(0, "progress", &progress, N_("force progress reporting")),
  84         OPT_STRING(0, "depth", &depth, N_("depth"),
  85                    N_("deepen history of shallow clone")),
  86         { OPTION_SET_INT, 0, "unshallow", &unshallow, NULL,
  87                    N_("convert to a complete repository"),
  88                    PARSE_OPT_NONEG | PARSE_OPT_NOARG, NULL, 1 },
  89         { OPTION_STRING, 0, "submodule-prefix", &submodule_prefix, N_("dir"),
  90                    N_("prepend this to submodule path output"), PARSE_OPT_HIDDEN },
  91         { OPTION_STRING, 0, "recurse-submodules-default",
  92                    &recurse_submodules_default, NULL,
  93                    N_("default mode for recursion"), PARSE_OPT_HIDDEN },
  94         OPT_END()
  95 };
  96
  97 static void unlock_pack(void)
  98 {
  99         if (gtransport)
 100                 transport_unlock_pack(gtransport);
 101         if (gsecondary)
 102                 transport_unlock_pack(gsecondary);
 103 }
 104
 105 static void unlock_pack_on_signal(int signo)
 106 {
 107         unlock_pack();
 108         sigchain_pop(signo);
 109         raise(signo);
 110 }
 111
 112 static void add_merge_config(struct ref **head,
 113                            const struct ref *remote_refs,
 114                            struct branch *branch,
 115                            struct ref ***tail)
 116 {
 117         int i;
 118
 119         for (i = 0; i < branch->merge_nr; i++) {
 120                 struct ref *rm, **old_tail = *tail;
 121                 struct refspec refspec;
 122
 123                 for (rm = *head; rm; rm = rm->next) {
 124                         if (branch_merge_matches(branch, i, rm->name)) {
 125                                 rm->fetch_head_status = FETCH_HEAD_MERGE;
 126                                 break;
 127                         }
 128                 }
 129                 if (rm)
 130                         continue;
 131
 132                 /*
 133                  * Not fetched to a remote-tracking branch?  We need to fetch
 134                  * it anyway to allow this branch's "branch.$name.merge"
 135                  * to be honored by 'git pull', but we do not have to
 136                  * fail if branch.$name.merge is misconfigured to point
 137                  * at a nonexisting branch.  If we were indeed called by
 138                  * 'git pull', it will notice the misconfiguration because
 139                  * there is no entry in the resulting FETCH_HEAD marked
 140                  * for merging.
 141                  */
 142                 memset(&refspec, 0, sizeof(refspec));
 143                 refspec.src = branch->merge[i]->src;
 144                 get_fetch_map(remote_refs, &refspec, tail, 1);
 145                 for (rm = *old_tail; rm; rm = rm->next)
 146                         rm->fetch_head_status = FETCH_HEAD_MERGE;
 147         }
 148 }
 149
 150 static void find_non_local_tags(struct transport *transport,
 151                         struct ref **head,
 152                         struct ref ***tail);
 153
 154 static struct ref *get_ref_map(struct transport *transport,
 155                                struct refspec *refs, int ref_count, int tags,
 156                                int *autotags)
 157 {
 158         int i;
 159         struct ref *rm;
 160         struct ref *ref_map = NULL;
 161         struct ref **tail = &ref_map;
 162
 163         const struct ref *remote_refs = transport_get_remote_refs(transport);
 164
 165         if (ref_count || tags == TAGS_SET) {
 166                 struct ref **old_tail;
 167
 168                 for (i = 0; i < ref_count; i++) {
 169                         get_fetch_map(remote_refs, &refs[i], &tail, 0);
 170                         if (refs[i].dst && refs[i].dst[0])
 171                                 *autotags = 1;
 172                 }
 173                 /* Merge everything on the command line, but not --tags */
 174                 for (rm = ref_map; rm; rm = rm->next)
 175                         rm->fetch_head_status = FETCH_HEAD_MERGE;
 176                 if (tags == TAGS_SET)
 177                         get_fetch_map(remote_refs, tag_refspec, &tail, 0);
 178
 179                 /*
 180                  * For any refs that we happen to be fetching via command-line
 181                  * arguments, take the opportunity to update their configured
 182                  * counterparts. However, we do not want to mention these
 183                  * entries in FETCH_HEAD at all, as they would simply be
 184                  * duplicates of existing entries.
 185                  */
 186                 old_tail = tail;
 187                 for (i = 0; i < transport->remote->fetch_refspec_nr; i++)
 188                         get_fetch_map(ref_map, &transport->remote->fetch[i],
 189                                       &tail, 1);
 190                 for (rm = *old_tail; rm; rm = rm->next)
 191                         rm->fetch_head_status = FETCH_HEAD_IGNORE;
 192         } else {
 193                 /* Use the defaults */
 194                 struct remote *remote = transport->remote;
 195                 struct branch *branch = branch_get(NULL);
 196                 int has_merge = branch_has_merge_config(branch);
 197                 if (remote &&
 198                     (remote->fetch_refspec_nr ||
 199                      /* Note: has_merge implies non-NULL branch->remote_name */
 200                      (has_merge && !strcmp(branch->remote_name, remote->name)))) {
 201                         for (i = 0; i < remote->fetch_refspec_nr; i++) {
 202                                 get_fetch_map(remote_refs, &remote->fetch[i], &tail, 0);
 203                                 if (remote->fetch[i].dst &&
 204                                     remote->fetch[i].dst[0])
 205                                         *autotags = 1;
 206                                 if (!i && !has_merge && ref_map &&
 207                                     !remote->fetch[0].pattern)
 208                                         ref_map->fetch_head_status = FETCH_HEAD_MERGE;
 209                         }
 210                         /*
 211                          * if the remote we're fetching from is the same
 212                          * as given in branch.<name>.remote, we add the
 213                          * ref given in branch.<name>.merge, too.
 214                          *
 215                          * Note: has_merge implies non-NULL branch->remote_name
 216                          */
 217                         if (has_merge &&
 218                             !strcmp(branch->remote_name, remote->name))
 219                                 add_merge_config(&ref_map, remote_refs, branch, &tail);
 220                 } else {
 221                         ref_map = get_remote_ref(remote_refs, "HEAD");
 222                         if (!ref_map)
 223                                 die(_("Couldn't find remote ref HEAD"));
 224                         ref_map->fetch_head_status = FETCH_HEAD_MERGE;
 225                         tail = &ref_map->next;
 226                 }
 227         }
 228         if (tags == TAGS_DEFAULT && *autotags)
 229                 find_non_local_tags(transport, &ref_map, &tail);
 230         ref_remove_duplicates(ref_map);
 231
 232         return ref_map;
 233 }
 234
 235 #define STORE_REF_ERROR_OTHER 1
 236 #define STORE_REF_ERROR_DF_CONFLICT 2
 237
 238 static int s_update_ref(const char *action,
 239                         struct ref *ref,
 240                         int check_old)
 241 {
 242         char msg[1024];
 243         char *rla = getenv("GIT_REFLOG_ACTION");
 244         static struct ref_lock *lock;
 245
 246         if (dry_run)
 247                 return 0;
 248         if (!rla)
 249                 rla = default_rla.buf;
 250         snprintf(msg, sizeof(msg), "%s: %s", rla, action);
 251         lock = lock_any_ref_for_update(ref->name,
 252                                        check_old ? ref->old_sha1 : NULL, 0);
 253         if (!lock)
 254                 return errno == ENOTDIR ? STORE_REF_ERROR_DF_CONFLICT :
 255                                           STORE_REF_ERROR_OTHER;
 256         if (write_ref_sha1(lock, ref->new_sha1, msg) < 0)
 257                 return errno == ENOTDIR ? STORE_REF_ERROR_DF_CONFLICT :
 258                                           STORE_REF_ERROR_OTHER;
 259         return 0;
 260 }
 261
 262 #define REFCOL_WIDTH  10
 263
 264 static int update_local_ref(struct ref *ref,
 265                             const char *remote,
 266                             const struct ref *remote_ref,
 267                             struct strbuf *display)
 268 {
 269         struct commit *current = NULL, *updated;
 270         enum object_type type;
 271         struct branch *current_branch = branch_get(NULL);
 272         const char *pretty_ref = prettify_refname(ref->name);
 273
 274         type = sha1_object_info(ref->new_sha1, NULL);
 275         if (type < 0)
 276                 die(_("object %s not found"), sha1_to_hex(ref->new_sha1));
 277
 278         if (!hashcmp(ref->old_sha1, ref->new_sha1)) {
 279                 if (verbosity > 0)
 280                         strbuf_addf(display, "= %-*s %-*s -> %s",
 281                                     TRANSPORT_SUMMARY(_("[up to date]")),
 282                                     REFCOL_WIDTH, remote, pretty_ref);
 283                 return 0;
 284         }
 285
 286         if (current_branch &&
 287             !strcmp(ref->name, current_branch->name) &&
 288             !(update_head_ok || is_bare_repository()) &&
 289             !is_null_sha1(ref->old_sha1)) {
 290                 /*
 291                  * If this is the head, and it's not okay to update
 292                  * the head, and the old value of the head isn't empty...
 293                  */
 294                 strbuf_addf(display,
 295                             _("! %-*s %-*s -> %s  (can't fetch in current branch)"),
 296                             TRANSPORT_SUMMARY(_("[rejected]")),
 297                             REFCOL_WIDTH, remote, pretty_ref);
 298                 return 1;
 299         }
 300
 301         if (!is_null_sha1(ref->old_sha1) &&
 302             !prefixcmp(ref->name, "refs/tags/")) {
 303                 int r;
 304                 r = s_update_ref("updating tag", ref, 0);
 305                 strbuf_addf(display, "%c %-*s %-*s -> %s%s",
 306                             r ? '!' : '-',
 307                             TRANSPORT_SUMMARY(_("[tag update]")),
 308                             REFCOL_WIDTH, remote, pretty_ref,
 309                             r ? _("  (unable to update local ref)") : "");
 310                 return r;
 311         }
 312
 313         current = lookup_commit_reference_gently(ref->old_sha1, 1);
 314         updated = lookup_commit_reference_gently(ref->new_sha1, 1);
 315         if (!current || !updated) {
 316                 const char *msg;
 317                 const char *what;
 318                 int r;
 319                 /*
 320                  * Nicely describe the new ref we're fetching.
 321                  * Base this on the remote's ref name, as it's
 322                  * more likely to follow a standard layout.
 323                  */
 324                 const char *name = remote_ref ? remote_ref->name : "";
 325                 if (!prefixcmp(name, "refs/tags/")) {
 326                         msg = "storing tag";
 327                         what = _("[new tag]");
 328                 } else if (!prefixcmp(name, "refs/heads/")) {
 329                         msg = "storing head";
 330                         what = _("[new branch]");
 331                 } else {
 332                         msg = "storing ref";
 333                         what = _("[new ref]");
 334                 }
 335
 336                 if ((recurse_submodules != RECURSE_SUBMODULES_OFF) &&
 337                     (recurse_submodules != RECURSE_SUBMODULES_ON))
 338                         check_for_new_submodule_commits(ref->new_sha1);
 339                 r = s_update_ref(msg, ref, 0);
 340                 strbuf_addf(display, "%c %-*s %-*s -> %s%s",
 341                             r ? '!' : '*',
 342                             TRANSPORT_SUMMARY(what),
 343                             REFCOL_WIDTH, remote, pretty_ref,
 344                             r ? _("  (unable to update local ref)") : "");
 345                 return r;
 346         }
 347
 348         if (in_merge_bases(current, updated)) {
 349                 char quickref[83];
 350                 int r;
 351                 strcpy(quickref, find_unique_abbrev(current->object.sha1, DEFAULT_ABBREV));
 352                 strcat(quickref, "..");
 353                 strcat(quickref, find_unique_abbrev(ref->new_sha1, DEFAULT_ABBREV));
 354                 if ((recurse_submodules != RECURSE_SUBMODULES_OFF) &&
 355                     (recurse_submodules != RECURSE_SUBMODULES_ON))
 356                         check_for_new_submodule_commits(ref->new_sha1);
 357                 r = s_update_ref("fast-forward", ref, 1);
 358                 strbuf_addf(display, "%c %-*s %-*s -> %s%s",
 359                             r ? '!' : ' ',
 360                             TRANSPORT_SUMMARY_WIDTH, quickref,
 361                             REFCOL_WIDTH, remote, pretty_ref,
 362                             r ? _("  (unable to update local ref)") : "");
 363                 return r;
 364         } else if (force || ref->force) {
 365                 char quickref[84];
 366                 int r;
 367                 strcpy(quickref, find_unique_abbrev(current->object.sha1, DEFAULT_ABBREV));
 368                 strcat(quickref, "...");
 369                 strcat(quickref, find_unique_abbrev(ref->new_sha1, DEFAULT_ABBREV));
 370                 if ((recurse_submodules != RECURSE_SUBMODULES_OFF) &&
 371                     (recurse_submodules != RECURSE_SUBMODULES_ON))
 372                         check_for_new_submodule_commits(ref->new_sha1);
 373                 r = s_update_ref("forced-update", ref, 1);
 374                 strbuf_addf(display, "%c %-*s %-*s -> %s  (%s)",
 375                             r ? '!' : '+',
 376                             TRANSPORT_SUMMARY_WIDTH, quickref,
 377                             REFCOL_WIDTH, remote, pretty_ref,
 378                             r ? _("unable to update local ref") : _("forced update"));
 379                 return r;
 380         } else {
 381                 strbuf_addf(display, "! %-*s %-*s -> %s  %s",
 382                             TRANSPORT_SUMMARY(_("[rejected]")),
 383                             REFCOL_WIDTH, remote, pretty_ref,
 384                             _("(non-fast-forward)"));
 385                 return 1;
 386         }
 387 }
 388
 389 static int iterate_ref_map(void *cb_data, unsigned char sha1[20])
 390 {
 391         struct ref **rm = cb_data;
 392         struct ref *ref = *rm;
 393
 394         if (!ref)
 395                 return -1; /* end of the list */
 396         *rm = ref->next;
 397         hashcpy(sha1, ref->old_sha1);
 398         return 0;
 399 }
 400
 401 static int store_updated_refs(const char *raw_url, const char *remote_name,
 402                 struct ref *ref_map)
 403 {
 404         FILE *fp;
 405         struct commit *commit;
 406         int url_len, i, shown_url = 0, rc = 0;
 407         struct strbuf note = STRBUF_INIT;
 408         const char *what, *kind;
 409         struct ref *rm;
 410         char *url, *filename = dry_run ? "/dev/null" : git_path("FETCH_HEAD");
 411         int want_status;
 412
 413         fp = fopen(filename, "a");
 414         if (!fp)
 415                 return error(_("cannot open %s: %s\n"), filename, strerror(errno));
 416
 417         if (raw_url)
 418                 url = transport_anonymize_url(raw_url);
 419         else
 420                 url = xstrdup("foreign");
 421
 422         rm = ref_map;
 423         if (check_everything_connected(iterate_ref_map, 0, &rm)) {
 424                 rc = error(_("%s did not send all necessary objects\n"), url);
 425                 goto abort;
 426         }
 427
 428         /*
 429          * We do a pass for each fetch_head_status type in their enum order, so
 430          * merged entries are written before not-for-merge. That lets readers
 431          * use FETCH_HEAD as a refname to refer to the ref to be merged.
 432          */
 433         for (want_status = FETCH_HEAD_MERGE;
 434              want_status <= FETCH_HEAD_IGNORE;
 435              want_status++) {
 436                 for (rm = ref_map; rm; rm = rm->next) {
 437                         struct ref *ref = NULL;
 438                         const char *merge_status_marker = "";
 439
 440                         commit = lookup_commit_reference_gently(rm->old_sha1, 1);
 441                         if (!commit)
 442                                 rm->fetch_head_status = FETCH_HEAD_NOT_FOR_MERGE;
 443
 444                         if (rm->fetch_head_status != want_status)
 445                                 continue;
 446
 447                         if (rm->peer_ref) {
 448                                 ref = xcalloc(1, sizeof(*ref) + strlen(rm->peer_ref->name) + 1);
 449                                 strcpy(ref->name, rm->peer_ref->name);
 450                                 hashcpy(ref->old_sha1, rm->peer_ref->old_sha1);
 451                                 hashcpy(ref->new_sha1, rm->old_sha1);
 452                                 ref->force = rm->peer_ref->force;
 453                         }
 454
 455
 456                         if (!strcmp(rm->name, "HEAD")) {
 457                                 kind = "";
 458                                 what = "";
 459                         }
 460                         else if (!prefixcmp(rm->name, "refs/heads/")) {
 461                                 kind = "branch";
 462                                 what = rm->name + 11;
 463                         }
 464                         else if (!prefixcmp(rm->name, "refs/tags/")) {
 465                                 kind = "tag";
 466                                 what = rm->name + 10;
 467                         }
 468                         else if (!prefixcmp(rm->name, "refs/remotes/")) {
 469                                 kind = "remote-tracking branch";
 470                                 what = rm->name + 13;
 471                         }
 472                         else {
 473                                 kind = "";
 474                                 what = rm->name;
 475                         }
 476
 477                         url_len = strlen(url);
 478                         for (i = url_len - 1; url[i] == '/' && 0 <= i; i--)
 479                                 ;
 480                         url_len = i + 1;
 481                         if (4 < i && !strncmp(".git", url + i - 3, 4))
 482                                 url_len = i - 3;
 483
 484                         strbuf_reset(&note);
 485                         if (*what) {
 486                                 if (*kind)
 487                                         strbuf_addf(&note, "%s ", kind);
 488                                 strbuf_addf(&note, "'%s' of ", what);
 489                         }
 490                         switch (rm->fetch_head_status) {
 491                         case FETCH_HEAD_NOT_FOR_MERGE:
 492                                 merge_status_marker = "not-for-merge";
 493                                 /* fall-through */
 494                         case FETCH_HEAD_MERGE:
 495                                 fprintf(fp, "%s\t%s\t%s",
 496                                         sha1_to_hex(rm->old_sha1),
 497                                         merge_status_marker,
 498                                         note.buf);
 499                                 for (i = 0; i < url_len; ++i)
 500                                         if ('\n' == url[i])
 501                                                 fputs("\\n", fp);
 502                                         else
 503                                                 fputc(url[i], fp);
 504                                 fputc('\n', fp);
 505                                 break;
 506                         default:
 507                                 /* do not write anything to FETCH_HEAD */
 508                                 break;
 509                         }
 510
 511                         strbuf_reset(&note);
 512                         if (ref) {
 513                                 rc |= update_local_ref(ref, what, rm, &note);
 514                                 free(ref);
 515                         } else
 516                                 strbuf_addf(&note, "* %-*s %-*s -> FETCH_HEAD",
 517                                             TRANSPORT_SUMMARY_WIDTH,
 518                                             *kind ? kind : "branch",
 519                                             REFCOL_WIDTH,
 520                                             *what ? what : "HEAD");
 521                         if (note.len) {
 522                                 if (verbosity >= 0 && !shown_url) {
 523                                         fprintf(stderr, _("From %.*s\n"),
 524                                                         url_len, url);
 525                                         shown_url = 1;
 526                                 }
 527                                 if (verbosity >= 0)
 528                                         fprintf(stderr, " %s\n", note.buf);
 529                         }
 530                 }
 531         }
 532
 533         if (rc & STORE_REF_ERROR_DF_CONFLICT)
 534                 error(_("some local refs could not be updated; try running\n"
 535                       " 'git remote prune %s' to remove any old, conflicting "
 536                       "branches"), remote_name);
 537
 538  abort:
 539         strbuf_release(&note);
 540         free(url);
 541         fclose(fp);
 542         return rc;
 543 }
 544
 545 /*
 546  * We would want to bypass the object transfer altogether if
 547  * everything we are going to fetch already exists and is connected
 548  * locally.
 549  */
 550 static int quickfetch(struct ref *ref_map)
 551 {
 552         struct ref *rm = ref_map;
 553
 554         /*
 555          * If we are deepening a shallow clone we already have these
 556          * objects reachable.  Running rev-list here will return with
 557          * a good (0) exit status and we'll bypass the fetch that we
 558          * really need to perform.  Claiming failure now will ensure
 559          * we perform the network exchange to deepen our history.
 560          */
 561         if (depth)
 562                 return -1;
 563         return check_everything_connected(iterate_ref_map, 1, &rm);
 564 }
 565
 566 static int fetch_refs(struct transport *transport, struct ref *ref_map)
 567 {
 568         int ret = quickfetch(ref_map);
 569         if (ret)
 570                 ret = transport_fetch_refs(transport, ref_map);
 571         if (!ret)
 572                 ret |= store_updated_refs(transport->url,
 573                                 transport->remote->name,
 574                                 ref_map);
 575         transport_unlock_pack(transport);
 576         return ret;
 577 }
 578
 579 static int prune_refs(struct refspec *refs, int ref_count, struct ref *ref_map)
 580 {
 581         int result = 0;
 582         struct ref *ref, *stale_refs = get_stale_heads(refs, ref_count, ref_map);
 583         const char *dangling_msg = dry_run
 584                 ? _("   (%s will become dangling)")
 585                 : _("   (%s has become dangling)");
 586
 587         for (ref = stale_refs; ref; ref = ref->next) {
 588                 if (!dry_run)
 589                         result |= delete_ref(ref->name, NULL, 0);
 590                 if (verbosity >= 0) {
 591                         fprintf(stderr, " x %-*s %-*s -> %s\n",
 592                                 TRANSPORT_SUMMARY(_("[deleted]")),
 593                                 REFCOL_WIDTH, _("(none)"), prettify_refname(ref->name));
 594                         warn_dangling_symref(stderr, dangling_msg, ref->name);
 595                 }
 596         }
 597         free_refs(stale_refs);
 598         return result;
 599 }
 600
 601 static int add_existing(const char *refname, const unsigned char *sha1,
 602                         int flag, void *cbdata)
 603 {
 604         struct string_list *list = (struct string_list *)cbdata;
 605         struct string_list_item *item = string_list_insert(list, refname);
 606         item->util = xmalloc(20);
 607         hashcpy(item->util, sha1);
 608         return 0;
 609 }
 610
 611 static int will_fetch(struct ref **head, const unsigned char *sha1)
 612 {
 613         struct ref *rm = *head;
 614         while (rm) {
 615                 if (!hashcmp(rm->old_sha1, sha1))
 616                         return 1;
 617                 rm = rm->next;
 618         }
 619         return 0;
 620 }
 621
 622 static void find_non_local_tags(struct transport *transport,
 623                         struct ref **head,
 624                         struct ref ***tail)
 625 {
 626         struct string_list existing_refs = STRING_LIST_INIT_DUP;
 627         struct string_list remote_refs = STRING_LIST_INIT_NODUP;
 628         const struct ref *ref;
 629         struct string_list_item *item = NULL;
 630
 631         for_each_ref(add_existing, &existing_refs);
 632         for (ref = transport_get_remote_refs(transport); ref; ref = ref->next) {
 633                 if (prefixcmp(ref->name, "refs/tags/"))
 634                         continue;
 635
 636                 /*
 637                  * The peeled ref always follows the matching base
 638                  * ref, so if we see a peeled ref that we don't want
 639                  * to fetch then we can mark the ref entry in the list
 640                  * as one to ignore by setting util to NULL.
 641                  */
 642                 if (!suffixcmp(ref->name, "^{}")) {
 643                         if (item && !has_sha1_file(ref->old_sha1) &&
 644                             !will_fetch(head, ref->old_sha1) &&
 645                             !has_sha1_file(item->util) &&
 646                             !will_fetch(head, item->util))
 647                                 item->util = NULL;
 648                         item = NULL;
 649                         continue;
 650                 }
 651
 652                 /*
 653                  * If item is non-NULL here, then we previously saw a
 654                  * ref not followed by a peeled reference, so we need
 655                  * to check if it is a lightweight tag that we want to
 656                  * fetch.
 657                  */
 658                 if (item && !has_sha1_file(item->util) &&
 659                     !will_fetch(head, item->util))
 660                         item->util = NULL;
 661
 662                 item = NULL;
 663
 664                 /* skip duplicates and refs that we already have */
 665                 if (string_list_has_string(&remote_refs, ref->name) ||
 666                     string_list_has_string(&existing_refs, ref->name))
 667                         continue;
 668
 669                 item = string_list_insert(&remote_refs, ref->name);
 670                 item->util = (void *)ref->old_sha1;
 671         }
 672         string_list_clear(&existing_refs, 1);
 673
 674         /*
 675          * We may have a final lightweight tag that needs to be
 676          * checked to see if it needs fetching.
 677          */
 678         if (item && !has_sha1_file(item->util) &&
 679             !will_fetch(head, item->util))
 680                 item->util = NULL;
 681
 682         /*
 683          * For all the tags in the remote_refs string list,
 684          * add them to the list of refs to be fetched
 685          */
 686         for_each_string_list_item(item, &remote_refs) {
 687                 /* Unless we have already decided to ignore this item... */
 688                 if (item->util)
 689                 {
 690                         struct ref *rm = alloc_ref(item->string);
 691                         rm->peer_ref = alloc_ref(item->string);
 692                         hashcpy(rm->old_sha1, item->util);
 693                         **tail = rm;
 694                         *tail = &rm->next;
 695                 }
 696         }
 697
 698         string_list_clear(&remote_refs, 0);
 699 }
 700
 701 static void check_not_current_branch(struct ref *ref_map)
 702 {
 703         struct branch *current_branch = branch_get(NULL);
 704
 705         if (is_bare_repository() || !current_branch)
 706                 return;
 707
 708         for (; ref_map; ref_map = ref_map->next)
 709                 if (ref_map->peer_ref && !strcmp(current_branch->refname,
 710                                         ref_map->peer_ref->name))
 711                         die(_("Refusing to fetch into current branch %s "
 712                             "of non-bare repository"), current_branch->refname);
 713 }
 714
 715 static int truncate_fetch_head(void)
 716 {
 717         char *filename = git_path("FETCH_HEAD");
 718         FILE *fp = fopen(filename, "w");
 719
 720         if (!fp)
 721                 return error(_("cannot open %s: %s\n"), filename, strerror(errno));
 722         fclose(fp);
 723         return 0;
 724 }
 725
 726 static void set_option(struct transport *transport, const char *name, const char *value)
 727 {
 728         int r = transport_set_option(transport, name, value);
 729         if (r < 0)
 730                 die(_("Option \"%s\" value \"%s\" is not valid for %s"),
 731                     name, value, transport->url);
 732         if (r > 0)
 733                 warning(_("Option \"%s\" is ignored for %s\n"),
 734                         name, transport->url);
 735 }
 736
 737 static struct transport *prepare_transport(struct remote *remote)
 738 {
 739         struct transport *transport;
 740         transport = transport_get(remote, NULL);
 741         transport_set_verbosity(transport, verbosity, progress);
 742         if (upload_pack)
 743                 set_option(transport, TRANS_OPT_UPLOADPACK, upload_pack);
 744         if (keep)
 745                 set_option(transport, TRANS_OPT_KEEP, "yes");
 746         if (depth)
 747                 set_option(transport, TRANS_OPT_DEPTH, depth);
 748         return transport;
 749 }
 750
 751 static void backfill_tags(struct transport *transport, struct ref *ref_map)
 752 {
 753         if (transport->cannot_reuse) {
 754                 gsecondary = prepare_transport(transport->remote);
 755                 transport = gsecondary;
 756         }
 757
 758         transport_set_option(transport, TRANS_OPT_FOLLOWTAGS, NULL);
 759         transport_set_option(transport, TRANS_OPT_DEPTH, "0");
 760         fetch_refs(transport, ref_map);
 761
 762         if (gsecondary) {
 763                 transport_disconnect(gsecondary);
 764                 gsecondary = NULL;
 765         }
 766 }
 767
 768 static int do_fetch(struct transport *transport,
 769                     struct refspec *refs, int ref_count)
 770 {
 771         struct string_list existing_refs = STRING_LIST_INIT_DUP;
 772         struct ref *ref_map;
 773         struct ref *rm;
 774         int autotags = (transport->remote->fetch_tags == 1);
 775         int retcode = 0;
 776
 777         for_each_ref(add_existing, &existing_refs);
 778
 779         if (tags == TAGS_DEFAULT) {
 780                 if (transport->remote->fetch_tags == 2)
 781                         tags = TAGS_SET;
 782                 if (transport->remote->fetch_tags == -1)
 783                         tags = TAGS_UNSET;
 784         }
 785
 786         if (!transport->get_refs_list || !transport->fetch)
 787                 die(_("Don't know how to fetch from %s"), transport->url);
 788
 789         /* if not appending, truncate FETCH_HEAD */
 790         if (!append && !dry_run) {
 791                 retcode = truncate_fetch_head();
 792                 if (retcode)
 793                         goto cleanup;
 794         }
 795
 796         ref_map = get_ref_map(transport, refs, ref_count, tags, &autotags);
 797         if (!update_head_ok)
 798                 check_not_current_branch(ref_map);
 799
 800         for (rm = ref_map; rm; rm = rm->next) {
 801                 if (rm->peer_ref) {
 802                         struct string_list_item *peer_item =
 803                                 string_list_lookup(&existing_refs,
 804                                                    rm->peer_ref->name);
 805                         if (peer_item)
 806                                 hashcpy(rm->peer_ref->old_sha1,
 807                                         peer_item->util);
 808                 }
 809         }
 810
 811         if (tags == TAGS_DEFAULT && autotags)
 812                 transport_set_option(transport, TRANS_OPT_FOLLOWTAGS, "1");
 813         if (fetch_refs(transport, ref_map)) {
 814                 free_refs(ref_map);
 815                 retcode = 1;
 816                 goto cleanup;
 817         }
 818         if (prune) {
 819                 /* If --tags was specified, pretend the user gave us the canonical tags refspec */
 820                 if (tags == TAGS_SET) {
 821                         const char *tags_str = "refs/tags/*:refs/tags/*";
 822                         struct refspec *tags_refspec, *refspec;
 823
 824                         /* Copy the refspec and add the tags to it */
 825                         refspec = xcalloc(ref_count + 1, sizeof(struct refspec));
 826                         tags_refspec = parse_fetch_refspec(1, &tags_str);
 827                         memcpy(refspec, refs, ref_count * sizeof(struct refspec));
 828                         memcpy(&refspec[ref_count], tags_refspec, sizeof(struct refspec));
 829                         ref_count++;
 830
 831                         prune_refs(refspec, ref_count, ref_map);
 832
 833                         ref_count--;
 834                         /* The rest of the strings belong to fetch_one */
 835                         free_refspec(1, tags_refspec);
 836                         free(refspec);
 837                 } else if (ref_count) {
 838                         prune_refs(refs, ref_count, ref_map);
 839                 } else {
 840                         prune_refs(transport->remote->fetch, transport->remote->fetch_refspec_nr, ref_map);
 841                 }
 842         }
 843         free_refs(ref_map);
 844
 845         /* if neither --no-tags nor --tags was specified, do automated tag
 846          * following ... */
 847         if (tags == TAGS_DEFAULT && autotags) {
 848                 struct ref **tail = &ref_map;
 849                 ref_map = NULL;
 850                 find_non_local_tags(transport, &ref_map, &tail);
 851                 if (ref_map)
 852                         backfill_tags(transport, ref_map);
 853                 free_refs(ref_map);
 854         }
 855
 856  cleanup:
 857         string_list_clear(&existing_refs, 1);
 858         return retcode;
 859 }
 860
 861 static int get_one_remote_for_fetch(struct remote *remote, void *priv)
 862 {
 863         struct string_list *list = priv;
 864         if (!remote->skip_default_update)
 865                 string_list_append(list, remote->name);
 866         return 0;
 867 }
 868
 869 struct remote_group_data {
 870         const char *name;
 871         struct string_list *list;
 872 };
 873
 874 static int get_remote_group(const char *key, const char *value, void *priv)
 875 {
 876         struct remote_group_data *g = priv;
 877
 878         if (!prefixcmp(key, "remotes.") &&
 879                         !strcmp(key + 8, g->name)) {
 880                 /* split list by white space */
 881                 int space = strcspn(value, " \t\n");
 882                 while (*value) {
 883                         if (space > 1) {
 884                                 string_list_append(g->list,
 885                                                    xstrndup(value, space));
 886                         }
 887                         value += space + (value[space] != '\0');
 888                         space = strcspn(value, " \t\n");
 889                 }
 890         }
 891
 892         return 0;
 893 }
 894
 895 static int add_remote_or_group(const char *name, struct string_list *list)
 896 {
 897         int prev_nr = list->nr;
 898         struct remote_group_data g;
 899         g.name = name; g.list = list;
 900
 901         git_config(get_remote_group, &g);
 902         if (list->nr == prev_nr) {
 903                 struct remote *remote;
 904                 if (!remote_is_configured(name))
 905                         return 0;
 906                 remote = remote_get(name);
 907                 string_list_append(list, remote->name);
 908         }
 909         return 1;
 910 }
 911
 912 static void add_options_to_argv(struct argv_array *argv)
 913 {
 914         if (dry_run)
 915                 argv_array_push(argv, "--dry-run");
 916         if (prune)
 917                 argv_array_push(argv, "--prune");
 918         if (update_head_ok)
 919                 argv_array_push(argv, "--update-head-ok");
 920         if (force)
 921                 argv_array_push(argv, "--force");
 922         if (keep)
 923                 argv_array_push(argv, "--keep");
 924         if (recurse_submodules == RECURSE_SUBMODULES_ON)
 925                 argv_array_push(argv, "--recurse-submodules");
 926         else if (recurse_submodules == RECURSE_SUBMODULES_ON_DEMAND)
 927                 argv_array_push(argv, "--recurse-submodules=on-demand");
 928         if (tags == TAGS_SET)
 929                 argv_array_push(argv, "--tags");
 930         else if (tags == TAGS_UNSET)
 931                 argv_array_push(argv, "--no-tags");
 932         if (verbosity >= 2)
 933                 argv_array_push(argv, "-v");
 934         if (verbosity >= 1)
 935                 argv_array_push(argv, "-v");
 936         else if (verbosity < 0)
 937                 argv_array_push(argv, "-q");
 938
 939 }
 940
 941 static int fetch_multiple(struct string_list *list)
 942 {
 943         int i, result = 0;
 944         struct argv_array argv = ARGV_ARRAY_INIT;
 945
 946         if (!append && !dry_run) {
 947                 int errcode = truncate_fetch_head();
 948                 if (errcode)
 949                         return errcode;
 950         }
 951
 952         argv_array_pushl(&argv, "fetch", "--append", NULL);
 953         add_options_to_argv(&argv);
 954
 955         for (i = 0; i < list->nr; i++) {
 956                 const char *name = list->items[i].string;
 957                 argv_array_push(&argv, name);
 958                 if (verbosity >= 0)
 959                         printf(_("Fetching %s\n"), name);
 960                 if (run_command_v_opt(argv.argv, RUN_GIT_CMD)) {
 961                         error(_("Could not fetch %s"), name);
 962                         result = 1;
 963                 }
 964                 argv_array_pop(&argv);
 965         }
 966
 967         argv_array_clear(&argv);
 968         return result;
 969 }
 970
 971 static int fetch_one(struct remote *remote, int argc, const char **argv)
 972 {
 973         int i;
 974         static const char **refs = NULL;
 975         struct refspec *refspec;
 976         int ref_nr = 0;
 977         int exit_code;
 978
 979         if (!remote)
 980                 die(_("No remote repository specified.  Please, specify either a URL or a\n"
 981                     "remote name from which new revisions should be fetched."));
 982
 983         gtransport = prepare_transport(remote);
 984         if (argc > 0) {
 985                 int j = 0;
 986                 refs = xcalloc(argc + 1, sizeof(const char *));
 987                 for (i = 0; i < argc; i++) {
 988                         if (!strcmp(argv[i], "tag")) {
 989                                 char *ref;
 990                                 i++;
 991                                 if (i >= argc)
 992                                         die(_("You need to specify a tag name."));
 993                                 ref = xmalloc(strlen(argv[i]) * 2 + 22);
 994                                 strcpy(ref, "refs/tags/");
 995                                 strcat(ref, argv[i]);
 996                                 strcat(ref, ":refs/tags/");
 997                                 strcat(ref, argv[i]);
 998                                 refs[j++] = ref;
 999                         } else
1000                                 refs[j++] = argv[i];
1001                 }
1002                 refs[j] = NULL;
1003                 ref_nr = j;
1004         }
1005
1006         sigchain_push_common(unlock_pack_on_signal);
1007         atexit(unlock_pack);
1008         refspec = parse_fetch_refspec(ref_nr, refs);
1009         exit_code = do_fetch(gtransport, refspec, ref_nr);
1010         free_refspec(ref_nr, refspec);
1011         transport_disconnect(gtransport);
1012         gtransport = NULL;
1013         return exit_code;
1014 }
1015
1016 int cmd_fetch(int argc, const char **argv, const char *prefix)
1017 {
1018         int i;
1019         struct string_list list = STRING_LIST_INIT_NODUP;
1020         struct remote *remote;
1021         int result = 0;
1022         static const char *argv_gc_auto[] = {
1023                 "gc", "--auto", NULL,
1024         };
1025
1026         packet_trace_identity("fetch");
1027
1028         /* Record the command line for the reflog */
1029         strbuf_addstr(&default_rla, "fetch");
1030         for (i = 1; i < argc; i++)
1031                 strbuf_addf(&default_rla, " %s", argv[i]);
1032
1033         argc = parse_options(argc, argv, prefix,
1034                              builtin_fetch_options, builtin_fetch_usage, 0);
1035
1036         if (unshallow) {
1037                 if (depth)
1038                         die(_("--depth and --unshallow cannot be used together"));
1039                 else if (!is_repository_shallow())
1040                         die(_("--unshallow on a complete repository does not make sense"));
1041                 else {
1042                         static char inf_depth[12];
1043                         sprintf(inf_depth, "%d", INFINITE_DEPTH);
1044                         depth = inf_depth;
1045                 }
1046         }
1047
1048         if (recurse_submodules != RECURSE_SUBMODULES_OFF) {
1049                 if (recurse_submodules_default) {
1050                         int arg = parse_fetch_recurse_submodules_arg("--recurse-submodules-default", recurse_submodules_default);
1051                         set_config_fetch_recurse_submodules(arg);
1052                 }
1053                 gitmodules_config();
1054                 git_config(submodule_config, NULL);
1055         }
1056
1057         if (all) {
1058                 if (argc == 1)
1059                         die(_("fetch --all does not take a repository argument"));
1060                 else if (argc > 1)
1061                         die(_("fetch --all does not make sense with refspecs"));
1062                 (void) for_each_remote(get_one_remote_for_fetch, &list);
1063                 result = fetch_multiple(&list);
1064         } else if (argc == 0) {
1065                 /* No arguments -- use default remote */
1066                 remote = remote_get(NULL);
1067                 result = fetch_one(remote, argc, argv);
1068         } else if (multiple) {
1069                 /* All arguments are assumed to be remotes or groups */
1070                 for (i = 0; i < argc; i++)
1071                         if (!add_remote_or_group(argv[i], &list))
1072                                 die(_("No such remote or remote group: %s"), argv[i]);
1073                 result = fetch_multiple(&list);
1074         } else {
1075                 /* Single remote or group */
1076                 (void) add_remote_or_group(argv[0], &list);
1077                 if (list.nr > 1) {
1078                         /* More than one remote */
1079                         if (argc > 1)
1080                                 die(_("Fetching a group and specifying refspecs does not make sense"));
1081                         result = fetch_multiple(&list);
1082                 } else {
1083                         /* Zero or one remotes */
1084                         remote = remote_get(argv[0]);
1085                         result = fetch_one(remote, argc-1, argv+1);
1086                 }
1087         }
1088
1089         if (!result && (recurse_submodules != RECURSE_SUBMODULES_OFF)) {
1090                 struct argv_array options = ARGV_ARRAY_INIT;
1091
1092                 add_options_to_argv(&options);
1093                 result = fetch_populated_submodules(&options,
1094                                                     submodule_prefix,
1095                                                     recurse_submodules,
1096                                                     verbosity < 0);
1097                 argv_array_clear(&options);
1098         }
1099
1100         /* All names were strdup()ed or strndup()ed */
1101         list.strdup_strings = 1;
1102         string_list_clear(&list, 0);
1103
1104         run_command_v_opt(argv_gc_auto, RUN_GIT_CMD);
1105
1106         return result;
1107 }