builtin/clone.c

   1 /*
   2  * Builtin "git clone"
   3  *
   4  * Copyright (c) 2007 Kristian Høgsberg <krh@redhat.com>,
   5  *               2008 Daniel Barkalow <barkalow@iabervon.org>
   6  * Based on git-commit.sh by Junio C Hamano and Linus Torvalds
   7  *
   8  * Clone a repository into a different directory that does not yet exist.
   9  */
  10
  11 #include "builtin.h"
  12 #include "parse-options.h"
  13 #include "fetch-pack.h"
  14 #include "refs.h"
  15 #include "tree.h"
  16 #include "tree-walk.h"
  17 #include "unpack-trees.h"
  18 #include "transport.h"
  19 #include "strbuf.h"
  20 #include "dir.h"
  21 #include "pack-refs.h"
  22 #include "sigchain.h"
  23 #include "branch.h"
  24 #include "remote.h"
  25 #include "run-command.h"
  26
  27 /*
  28  * Overall FIXMEs:
  29  *  - respect DB_ENVIRONMENT for .git/objects.
  30  *
  31  * Implementation notes:
  32  *  - dropping use-separate-remote and no-separate-remote compatibility
  33  *
  34  */
  35 static const char * const builtin_clone_usage[] = {
  36         "git clone [options] [--] <repo> [<dir>]",
  37         NULL
  38 };
  39
  40 static int option_no_checkout, option_bare, option_mirror;
  41 static int option_local, option_no_hardlinks, option_shared, option_recursive;
  42 static char *option_template, *option_reference, *option_depth;
  43 static char *option_origin = NULL;
  44 static char *option_branch = NULL;
  45 static const char *real_git_dir;
  46 static char *option_upload_pack = "git-upload-pack";
  47 static int option_verbosity;
  48 static int option_progress;
  49
  50 static struct option builtin_clone_options[] = {
  51         OPT__VERBOSITY(&option_verbosity),
  52         OPT_BOOLEAN(0, "progress", &option_progress,
  53                         "force progress reporting"),
  54         OPT_BOOLEAN('n', "no-checkout", &option_no_checkout,
  55                     "don't create a checkout"),
  56         OPT_BOOLEAN(0, "bare", &option_bare, "create a bare repository"),
  57         { OPTION_BOOLEAN, 0, "naked", &option_bare, NULL,
  58                 "create a bare repository",
  59                 PARSE_OPT_NOARG | PARSE_OPT_HIDDEN },
  60         OPT_BOOLEAN(0, "mirror", &option_mirror,
  61                     "create a mirror repository (implies bare)"),
  62         OPT_BOOLEAN('l', "local", &option_local,
  63                     "to clone from a local repository"),
  64         OPT_BOOLEAN(0, "no-hardlinks", &option_no_hardlinks,
  65                     "don't use local hardlinks, always copy"),
  66         OPT_BOOLEAN('s', "shared", &option_shared,
  67                     "setup as shared repository"),
  68         OPT_BOOLEAN(0, "recursive", &option_recursive,
  69                     "initialize submodules in the clone"),
  70         OPT_BOOLEAN(0, "recurse-submodules", &option_recursive,
  71                     "initialize submodules in the clone"),
  72         OPT_STRING(0, "template", &option_template, "template-directory",
  73                    "directory from which templates will be used"),
  74         OPT_STRING(0, "reference", &option_reference, "repo",
  75                    "reference repository"),
  76         OPT_STRING('o', "origin", &option_origin, "branch",
  77                    "use <branch> instead of 'origin' to track upstream"),
  78         OPT_STRING('b', "branch", &option_branch, "branch",
  79                    "checkout <branch> instead of the remote's HEAD"),
  80         OPT_STRING('u', "upload-pack", &option_upload_pack, "path",
  81                    "path to git-upload-pack on the remote"),
  82         OPT_STRING(0, "depth", &option_depth, "depth",
  83                     "create a shallow clone of that depth"),
  84         OPT_STRING('L', "separate-git-dir", &real_git_dir, "gitdir",
  85                    "separate git dir from working tree"),
  86
  87         OPT_END()
  88 };
  89
  90 static const char *argv_submodule[] = {
  91         "submodule", "update", "--init", "--recursive", NULL
  92 };
  93
  94 static char *get_repo_path(const char *repo, int *is_bundle)
  95 {
  96         static char *suffix[] = { "/.git", ".git", "" };
  97         static char *bundle_suffix[] = { ".bundle", "" };
  98         struct stat st;
  99         int i;
 100
 101         for (i = 0; i < ARRAY_SIZE(suffix); i++) {
 102                 const char *path;
 103                 path = mkpath("%s%s", repo, suffix[i]);
 104                 if (is_directory(path)) {
 105                         *is_bundle = 0;
 106                         return xstrdup(absolute_path(path));
 107                 }
 108         }
 109
 110         for (i = 0; i < ARRAY_SIZE(bundle_suffix); i++) {
 111                 const char *path;
 112                 path = mkpath("%s%s", repo, bundle_suffix[i]);
 113                 if (!stat(path, &st) && S_ISREG(st.st_mode)) {
 114                         *is_bundle = 1;
 115                         return xstrdup(absolute_path(path));
 116                 }
 117         }
 118
 119         return NULL;
 120 }
 121
 122 static char *guess_dir_name(const char *repo, int is_bundle, int is_bare)
 123 {
 124         const char *end = repo + strlen(repo), *start;
 125         char *dir;
 126
 127         /*
 128          * Strip trailing spaces, slashes and /.git
 129          */
 130         while (repo < end && (is_dir_sep(end[-1]) || isspace(end[-1])))
 131                 end--;
 132         if (end - repo > 5 && is_dir_sep(end[-5]) &&
 133             !strncmp(end - 4, ".git", 4)) {
 134                 end -= 5;
 135                 while (repo < end && is_dir_sep(end[-1]))
 136                         end--;
 137         }
 138
 139         /*
 140          * Find last component, but be prepared that repo could have
 141          * the form  "remote.example.com:foo.git", i.e. no slash
 142          * in the directory part.
 143          */
 144         start = end;
 145         while (repo < start && !is_dir_sep(start[-1]) && start[-1] != ':')
 146                 start--;
 147
 148         /*
 149          * Strip .{bundle,git}.
 150          */
 151         if (is_bundle) {
 152                 if (end - start > 7 && !strncmp(end - 7, ".bundle", 7))
 153                         end -= 7;
 154         } else {
 155                 if (end - start > 4 && !strncmp(end - 4, ".git", 4))
 156                         end -= 4;
 157         }
 158
 159         if (is_bare) {
 160                 struct strbuf result = STRBUF_INIT;
 161                 strbuf_addf(&result, "%.*s.git", (int)(end - start), start);
 162                 dir = strbuf_detach(&result, NULL);
 163         } else
 164                 dir = xstrndup(start, end - start);
 165         /*
 166          * Replace sequences of 'control' characters and whitespace
 167          * with one ascii space, remove leading and trailing spaces.
 168          */
 169         if (*dir) {
 170                 char *out = dir;
 171                 int prev_space = 1 /* strip leading whitespace */;
 172                 for (end = dir; *end; ++end) {
 173                         char ch = *end;
 174                         if ((unsigned char)ch < '\x20')
 175                                 ch = '\x20';
 176                         if (isspace(ch)) {
 177                                 if (prev_space)
 178                                         continue;
 179                                 prev_space = 1;
 180                         } else
 181                                 prev_space = 0;
 182                         *out++ = ch;
 183                 }
 184                 *out = '\0';
 185                 if (out > dir && prev_space)
 186                         out[-1] = '\0';
 187         }
 188         return dir;
 189 }
 190
 191 static void strip_trailing_slashes(char *dir)
 192 {
 193         char *end = dir + strlen(dir);
 194
 195         while (dir < end - 1 && is_dir_sep(end[-1]))
 196                 end--;
 197         *end = '\0';
 198 }
 199
 200 static void setup_reference(const char *repo)
 201 {
 202         const char *ref_git;
 203         char *ref_git_copy;
 204
 205         struct remote *remote;
 206         struct transport *transport;
 207         const struct ref *extra;
 208
 209         ref_git = real_path(option_reference);
 210
 211         if (is_directory(mkpath("%s/.git/objects", ref_git)))
 212                 ref_git = mkpath("%s/.git", ref_git);
 213         else if (!is_directory(mkpath("%s/objects", ref_git)))
 214                 die(_("reference repository '%s' is not a local directory."),
 215                     option_reference);
 216
 217         ref_git_copy = xstrdup(ref_git);
 218
 219         add_to_alternates_file(ref_git_copy);
 220
 221         remote = remote_get(ref_git_copy);
 222         transport = transport_get(remote, ref_git_copy);
 223         for (extra = transport_get_remote_refs(transport); extra;
 224              extra = extra->next)
 225                 add_extra_ref(extra->name, extra->old_sha1, 0);
 226
 227         transport_disconnect(transport);
 228
 229         free(ref_git_copy);
 230 }
 231
 232 static void copy_or_link_directory(struct strbuf *src, struct strbuf *dest)
 233 {
 234         struct dirent *de;
 235         struct stat buf;
 236         int src_len, dest_len;
 237         DIR *dir;
 238
 239         dir = opendir(src->buf);
 240         if (!dir)
 241                 die_errno(_("failed to open '%s'"), src->buf);
 242
 243         if (mkdir(dest->buf, 0777)) {
 244                 if (errno != EEXIST)
 245                         die_errno(_("failed to create directory '%s'"), dest->buf);
 246                 else if (stat(dest->buf, &buf))
 247                         die_errno(_("failed to stat '%s'"), dest->buf);
 248                 else if (!S_ISDIR(buf.st_mode))
 249                         die(_("%s exists and is not a directory"), dest->buf);
 250         }
 251
 252         strbuf_addch(src, '/');
 253         src_len = src->len;
 254         strbuf_addch(dest, '/');
 255         dest_len = dest->len;
 256
 257         while ((de = readdir(dir)) != NULL) {
 258                 strbuf_setlen(src, src_len);
 259                 strbuf_addstr(src, de->d_name);
 260                 strbuf_setlen(dest, dest_len);
 261                 strbuf_addstr(dest, de->d_name);
 262                 if (stat(src->buf, &buf)) {
 263                         warning (_("failed to stat %s\n"), src->buf);
 264                         continue;
 265                 }
 266                 if (S_ISDIR(buf.st_mode)) {
 267                         if (de->d_name[0] != '.')
 268                                 copy_or_link_directory(src, dest);
 269                         continue;
 270                 }
 271
 272                 if (unlink(dest->buf) && errno != ENOENT)
 273                         die_errno(_("failed to unlink '%s'"), dest->buf);
 274                 if (!option_no_hardlinks) {
 275                         if (!link(src->buf, dest->buf))
 276                                 continue;
 277                         if (option_local)
 278                                 die_errno(_("failed to create link '%s'"), dest->buf);
 279                         option_no_hardlinks = 1;
 280                 }
 281                 if (copy_file_with_time(dest->buf, src->buf, 0666))
 282                         die_errno(_("failed to copy file to '%s'"), dest->buf);
 283         }
 284         closedir(dir);
 285 }
 286
 287 static const struct ref *clone_local(const char *src_repo,
 288                                      const char *dest_repo)
 289 {
 290         const struct ref *ret;
 291         struct strbuf src = STRBUF_INIT;
 292         struct strbuf dest = STRBUF_INIT;
 293         struct remote *remote;
 294         struct transport *transport;
 295
 296         if (option_shared)
 297                 add_to_alternates_file(src_repo);
 298         else {
 299                 strbuf_addf(&src, "%s/objects", src_repo);
 300                 strbuf_addf(&dest, "%s/objects", dest_repo);
 301                 copy_or_link_directory(&src, &dest);
 302                 strbuf_release(&src);
 303                 strbuf_release(&dest);
 304         }
 305
 306         remote = remote_get(src_repo);
 307         transport = transport_get(remote, src_repo);
 308         ret = transport_get_remote_refs(transport);
 309         transport_disconnect(transport);
 310         if (0 <= option_verbosity)
 311                 printf(_("done.\n"));
 312         return ret;
 313 }
 314
 315 static const char *junk_work_tree;
 316 static const char *junk_git_dir;
 317 static pid_t junk_pid;
 318
 319 static void remove_junk(void)
 320 {
 321         struct strbuf sb = STRBUF_INIT;
 322         if (getpid() != junk_pid)
 323                 return;
 324         if (junk_git_dir) {
 325                 strbuf_addstr(&sb, junk_git_dir);
 326                 remove_dir_recursively(&sb, 0);
 327                 strbuf_reset(&sb);
 328         }
 329         if (junk_work_tree) {
 330                 strbuf_addstr(&sb, junk_work_tree);
 331                 remove_dir_recursively(&sb, 0);
 332                 strbuf_reset(&sb);
 333         }
 334 }
 335
 336 static void remove_junk_on_signal(int signo)
 337 {
 338         remove_junk();
 339         sigchain_pop(signo);
 340         raise(signo);
 341 }
 342
 343 static struct ref *wanted_peer_refs(const struct ref *refs,
 344                 struct refspec *refspec)
 345 {
 346         struct ref *local_refs = NULL;
 347         struct ref **tail = &local_refs;
 348
 349         get_fetch_map(refs, refspec, &tail, 0);
 350         if (!option_mirror)
 351                 get_fetch_map(refs, tag_refspec, &tail, 0);
 352
 353         return local_refs;
 354 }
 355
 356 static void write_remote_refs(const struct ref *local_refs)
 357 {
 358         const struct ref *r;
 359
 360         for (r = local_refs; r; r = r->next)
 361                 add_extra_ref(r->peer_ref->name, r->old_sha1, 0);
 362
 363         pack_refs(PACK_REFS_ALL);
 364         clear_extra_refs();
 365 }
 366
 367 int cmd_clone(int argc, const char **argv, const char *prefix)
 368 {
 369         int is_bundle = 0, is_local;
 370         struct stat buf;
 371         const char *repo_name, *repo, *work_tree, *git_dir;
 372         char *path, *dir;
 373         int dest_exists;
 374         const struct ref *refs, *remote_head;
 375         const struct ref *remote_head_points_at;
 376         const struct ref *our_head_points_at;
 377         struct ref *mapped_refs;
 378         struct strbuf key = STRBUF_INIT, value = STRBUF_INIT;
 379         struct strbuf branch_top = STRBUF_INIT, reflog_msg = STRBUF_INIT;
 380         struct transport *transport = NULL;
 381         char *src_ref_prefix = "refs/heads/";
 382         int err = 0;
 383
 384         struct refspec *refspec;
 385         const char *fetch_pattern;
 386
 387         junk_pid = getpid();
 388
 389         packet_trace_identity("clone");
 390         argc = parse_options(argc, argv, prefix, builtin_clone_options,
 391                              builtin_clone_usage, 0);
 392
 393         if (argc > 2)
 394                 usage_msg_opt(_("Too many arguments."),
 395                         builtin_clone_usage, builtin_clone_options);
 396
 397         if (argc == 0)
 398                 usage_msg_opt(_("You must specify a repository to clone."),
 399                         builtin_clone_usage, builtin_clone_options);
 400
 401         if (option_mirror)
 402                 option_bare = 1;
 403
 404         if (option_bare) {
 405                 if (option_origin)
 406                         die(_("--bare and --origin %s options are incompatible."),
 407                             option_origin);
 408                 option_no_checkout = 1;
 409         }
 410
 411         if (!option_origin)
 412                 option_origin = "origin";
 413
 414         repo_name = argv[0];
 415
 416         path = get_repo_path(repo_name, &is_bundle);
 417         if (path)
 418                 repo = xstrdup(absolute_path(repo_name));
 419         else if (!strchr(repo_name, ':'))
 420                 die("repository '%s' does not exist", repo_name);
 421         else
 422                 repo = repo_name;
 423         is_local = path && !is_bundle;
 424         if (is_local && option_depth)
 425                 warning(_("--depth is ignored in local clones; use file:// instead."));
 426
 427         if (argc == 2)
 428                 dir = xstrdup(argv[1]);
 429         else
 430                 dir = guess_dir_name(repo_name, is_bundle, option_bare);
 431         strip_trailing_slashes(dir);
 432
 433         dest_exists = !stat(dir, &buf);
 434         if (dest_exists && !is_empty_dir(dir))
 435                 die(_("destination path '%s' already exists and is not "
 436                         "an empty directory."), dir);
 437
 438         strbuf_addf(&reflog_msg, "clone: from %s", repo);
 439
 440         if (option_bare)
 441                 work_tree = NULL;
 442         else {
 443                 work_tree = getenv("GIT_WORK_TREE");
 444                 if (work_tree && !stat(work_tree, &buf))
 445                         die(_("working tree '%s' already exists."), work_tree);
 446         }
 447
 448         if (option_bare || work_tree)
 449                 git_dir = xstrdup(dir);
 450         else {
 451                 work_tree = dir;
 452                 git_dir = xstrdup(mkpath("%s/.git", dir));
 453         }
 454
 455         if (!option_bare) {
 456                 junk_work_tree = work_tree;
 457                 if (safe_create_leading_directories_const(work_tree) < 0)
 458                         die_errno(_("could not create leading directories of '%s'"),
 459                                   work_tree);
 460                 if (!dest_exists && mkdir(work_tree, 0755))
 461                         die_errno(_("could not create work tree dir '%s'."),
 462                                   work_tree);
 463                 set_git_work_tree(work_tree);
 464         }
 465         junk_git_dir = git_dir;
 466         atexit(remove_junk);
 467         sigchain_push_common(remove_junk_on_signal);
 468
 469         setenv(CONFIG_ENVIRONMENT, mkpath("%s/config", git_dir), 1);
 470
 471         if (safe_create_leading_directories_const(git_dir) < 0)
 472                 die(_("could not create leading directories of '%s'"), git_dir);
 473
 474         set_git_dir_init(git_dir, real_git_dir, 0);
 475         if (real_git_dir)
 476                 git_dir = real_git_dir;
 477
 478         if (0 <= option_verbosity) {
 479                 if (option_bare)
 480                         printf(_("Cloning into bare repository %s...\n"), dir);
 481                 else
 482                         printf(_("Cloning into %s...\n"), dir);
 483         }
 484         init_db(option_template, INIT_DB_QUIET);
 485
 486         /*
 487          * At this point, the config exists, so we do not need the
 488          * environment variable.  We actually need to unset it, too, to
 489          * re-enable parsing of the global configs.
 490          */
 491         unsetenv(CONFIG_ENVIRONMENT);
 492
 493         git_config(git_default_config, NULL);
 494
 495         if (option_bare) {
 496                 if (option_mirror)
 497                         src_ref_prefix = "refs/";
 498                 strbuf_addstr(&branch_top, src_ref_prefix);
 499
 500                 git_config_set("core.bare", "true");
 501         } else {
 502                 strbuf_addf(&branch_top, "refs/remotes/%s/", option_origin);
 503         }
 504
 505         strbuf_addf(&value, "+%s*:%s*", src_ref_prefix, branch_top.buf);
 506
 507         if (option_mirror || !option_bare) {
 508                 /* Configure the remote */
 509                 strbuf_addf(&key, "remote.%s.fetch", option_origin);
 510                 git_config_set_multivar(key.buf, value.buf, "^$", 0);
 511                 strbuf_reset(&key);
 512
 513                 if (option_mirror) {
 514                         strbuf_addf(&key, "remote.%s.mirror", option_origin);
 515                         git_config_set(key.buf, "true");
 516                         strbuf_reset(&key);
 517                 }
 518         }
 519
 520         strbuf_addf(&key, "remote.%s.url", option_origin);
 521         git_config_set(key.buf, repo);
 522         strbuf_reset(&key);
 523
 524         if (option_reference)
 525                 setup_reference(git_dir);
 526
 527         fetch_pattern = value.buf;
 528         refspec = parse_fetch_refspec(1, &fetch_pattern);
 529
 530         strbuf_reset(&value);
 531
 532         if (is_local) {
 533                 refs = clone_local(path, git_dir);
 534                 mapped_refs = wanted_peer_refs(refs, refspec);
 535         } else {
 536                 struct remote *remote = remote_get(option_origin);
 537                 transport = transport_get(remote, remote->url[0]);
 538
 539                 if (!transport->get_refs_list || !transport->fetch)
 540                         die(_("Don't know how to clone %s"), transport->url);
 541
 542                 transport_set_option(transport, TRANS_OPT_KEEP, "yes");
 543
 544                 if (option_depth)
 545                         transport_set_option(transport, TRANS_OPT_DEPTH,
 546                                              option_depth);
 547
 548                 transport_set_verbosity(transport, option_verbosity, option_progress);
 549
 550                 if (option_upload_pack)
 551                         transport_set_option(transport, TRANS_OPT_UPLOADPACK,
 552                                              option_upload_pack);
 553
 554                 refs = transport_get_remote_refs(transport);
 555                 if (refs) {
 556                         mapped_refs = wanted_peer_refs(refs, refspec);
 557                         transport_fetch_refs(transport, mapped_refs);
 558                 }
 559         }
 560
 561         if (refs) {
 562                 clear_extra_refs();
 563
 564                 write_remote_refs(mapped_refs);
 565
 566                 remote_head = find_ref_by_name(refs, "HEAD");
 567                 remote_head_points_at =
 568                         guess_remote_head(remote_head, mapped_refs, 0);
 569
 570                 if (option_branch) {
 571                         struct strbuf head = STRBUF_INIT;
 572                         strbuf_addstr(&head, src_ref_prefix);
 573                         strbuf_addstr(&head, option_branch);
 574                         our_head_points_at =
 575                                 find_ref_by_name(mapped_refs, head.buf);
 576                         strbuf_release(&head);
 577
 578                         if (!our_head_points_at) {
 579                                 warning(_("Remote branch %s not found in "
 580                                         "upstream %s, using HEAD instead"),
 581                                         option_branch, option_origin);
 582                                 our_head_points_at = remote_head_points_at;
 583                         }
 584                 }
 585                 else
 586                         our_head_points_at = remote_head_points_at;
 587         }
 588         else {
 589                 warning(_("You appear to have cloned an empty repository."));
 590                 our_head_points_at = NULL;
 591                 remote_head_points_at = NULL;
 592                 remote_head = NULL;
 593                 option_no_checkout = 1;
 594                 if (!option_bare)
 595                         install_branch_config(0, "master", option_origin,
 596                                               "refs/heads/master");
 597         }
 598
 599         if (remote_head_points_at && !option_bare) {
 600                 struct strbuf head_ref = STRBUF_INIT;
 601                 strbuf_addstr(&head_ref, branch_top.buf);
 602                 strbuf_addstr(&head_ref, "HEAD");
 603                 create_symref(head_ref.buf,
 604                               remote_head_points_at->peer_ref->name,
 605                               reflog_msg.buf);
 606         }
 607
 608         if (our_head_points_at) {
 609                 /* Local default branch link */
 610                 create_symref("HEAD", our_head_points_at->name, NULL);
 611                 if (!option_bare) {
 612                         const char *head = skip_prefix(our_head_points_at->name,
 613                                                        "refs/heads/");
 614                         update_ref(reflog_msg.buf, "HEAD",
 615                                    our_head_points_at->old_sha1,
 616                                    NULL, 0, DIE_ON_ERR);
 617                         install_branch_config(0, head, option_origin,
 618                                               our_head_points_at->name);
 619                 }
 620         } else if (remote_head) {
 621                 /* Source had detached HEAD pointing somewhere. */
 622                 if (!option_bare) {
 623                         update_ref(reflog_msg.buf, "HEAD",
 624                                    remote_head->old_sha1,
 625                                    NULL, REF_NODEREF, DIE_ON_ERR);
 626                         our_head_points_at = remote_head;
 627                 }
 628         } else {
 629                 /* Nothing to checkout out */
 630                 if (!option_no_checkout)
 631                         warning(_("remote HEAD refers to nonexistent ref, "
 632                                 "unable to checkout.\n"));
 633                 option_no_checkout = 1;
 634         }
 635
 636         if (transport) {
 637                 transport_unlock_pack(transport);
 638                 transport_disconnect(transport);
 639         }
 640
 641         if (!option_no_checkout) {
 642                 struct lock_file *lock_file = xcalloc(1, sizeof(struct lock_file));
 643                 struct unpack_trees_options opts;
 644                 struct tree *tree;
 645                 struct tree_desc t;
 646                 int fd;
 647
 648                 /* We need to be in the new work tree for the checkout */
 649                 setup_work_tree();
 650
 651                 fd = hold_locked_index(lock_file, 1);
 652
 653                 memset(&opts, 0, sizeof opts);
 654                 opts.update = 1;
 655                 opts.merge = 1;
 656                 opts.fn = oneway_merge;
 657                 opts.verbose_update = (option_verbosity > 0);
 658                 opts.src_index = &the_index;
 659                 opts.dst_index = &the_index;
 660
 661                 tree = parse_tree_indirect(our_head_points_at->old_sha1);
 662                 parse_tree(tree);
 663                 init_tree_desc(&t, tree->buffer, tree->size);
 664                 unpack_trees(1, &t, &opts);
 665
 666                 if (write_cache(fd, active_cache, active_nr) ||
 667                     commit_locked_index(lock_file))
 668                         die(_("unable to write new index file"));
 669
 670                 err |= run_hook(NULL, "post-checkout", sha1_to_hex(null_sha1),
 671                                 sha1_to_hex(our_head_points_at->old_sha1), "1",
 672                                 NULL);
 673
 674                 if (!err && option_recursive)
 675                         err = run_command_v_opt(argv_submodule, RUN_GIT_CMD);
 676         }
 677
 678         strbuf_release(&reflog_msg);
 679         strbuf_release(&branch_top);
 680         strbuf_release(&key);
 681         strbuf_release(&value);
 682         junk_pid = 0;
 683         return err;
 684 }