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