git.oblomov.eu Git - git/blob - builtin/init-db.c

   1 /*
   2  * GIT - The information manager from hell
   3  *
   4  * Copyright (C) Linus Torvalds, 2005
   5  */
   6 #include "cache.h"
   7 #include "config.h"
   8 #include "refs.h"
   9 #include "builtin.h"
  10 #include "exec-cmd.h"
  11 #include "parse-options.h"
  12
  13 #ifndef DEFAULT_GIT_TEMPLATE_DIR
  14 #define DEFAULT_GIT_TEMPLATE_DIR "/usr/share/git-core/templates"
  15 #endif
  16
  17 #ifdef NO_TRUSTABLE_FILEMODE
  18 #define TEST_FILEMODE 0
  19 #else
  20 #define TEST_FILEMODE 1
  21 #endif
  22
  23 #define GIT_DEFAULT_HASH_ENVIRONMENT "GIT_DEFAULT_HASH"
  24
  25 static int init_is_bare_repository = 0;
  26 static int init_shared_repository = -1;
  27 static const char *init_db_template_dir;
  28
  29 static void copy_templates_1(struct strbuf *path, struct strbuf *template_path,
  30                              DIR *dir)
  31 {
  32         size_t path_baselen = path->len;
  33         size_t template_baselen = template_path->len;
  34         struct dirent *de;
  35
  36         /* Note: if ".git/hooks" file exists in the repository being
  37          * re-initialized, /etc/core-git/templates/hooks/update would
  38          * cause "git init" to fail here.  I think this is sane but
  39          * it means that the set of templates we ship by default, along
  40          * with the way the namespace under .git/ is organized, should
  41          * be really carefully chosen.
  42          */
  43         safe_create_dir(path->buf, 1);
  44         while ((de = readdir(dir)) != NULL) {
  45                 struct stat st_git, st_template;
  46                 int exists = 0;
  47
  48                 strbuf_setlen(path, path_baselen);
  49                 strbuf_setlen(template_path, template_baselen);
  50
  51                 if (de->d_name[0] == '.')
  52                         continue;
  53                 strbuf_addstr(path, de->d_name);
  54                 strbuf_addstr(template_path, de->d_name);
  55                 if (lstat(path->buf, &st_git)) {
  56                         if (errno != ENOENT)
  57                                 die_errno(_("cannot stat '%s'"), path->buf);
  58                 }
  59                 else
  60                         exists = 1;
  61
  62                 if (lstat(template_path->buf, &st_template))
  63                         die_errno(_("cannot stat template '%s'"), template_path->buf);
  64
  65                 if (S_ISDIR(st_template.st_mode)) {
  66                         DIR *subdir = opendir(template_path->buf);
  67                         if (!subdir)
  68                                 die_errno(_("cannot opendir '%s'"), template_path->buf);
  69                         strbuf_addch(path, '/');
  70                         strbuf_addch(template_path, '/');
  71                         copy_templates_1(path, template_path, subdir);
  72                         closedir(subdir);
  73                 }
  74                 else if (exists)
  75                         continue;
  76                 else if (S_ISLNK(st_template.st_mode)) {
  77                         struct strbuf lnk = STRBUF_INIT;
  78                         if (strbuf_readlink(&lnk, template_path->buf,
  79                                             st_template.st_size) < 0)
  80                                 die_errno(_("cannot readlink '%s'"), template_path->buf);
  81                         if (symlink(lnk.buf, path->buf))
  82                                 die_errno(_("cannot symlink '%s' '%s'"),
  83                                           lnk.buf, path->buf);
  84                         strbuf_release(&lnk);
  85                 }
  86                 else if (S_ISREG(st_template.st_mode)) {
  87                         if (copy_file(path->buf, template_path->buf, st_template.st_mode))
  88                                 die_errno(_("cannot copy '%s' to '%s'"),
  89                                           template_path->buf, path->buf);
  90                 }
  91                 else
  92                         error(_("ignoring template %s"), template_path->buf);
  93         }
  94 }
  95
  96 static void copy_templates(const char *template_dir)
  97 {
  98         struct strbuf path = STRBUF_INIT;
  99         struct strbuf template_path = STRBUF_INIT;
 100         size_t template_len;
 101         struct repository_format template_format = REPOSITORY_FORMAT_INIT;
 102         struct strbuf err = STRBUF_INIT;
 103         DIR *dir;
 104         char *to_free = NULL;
 105
 106         if (!template_dir)
 107                 template_dir = getenv(TEMPLATE_DIR_ENVIRONMENT);
 108         if (!template_dir)
 109                 template_dir = init_db_template_dir;
 110         if (!template_dir)
 111                 template_dir = to_free = system_path(DEFAULT_GIT_TEMPLATE_DIR);
 112         if (!template_dir[0]) {
 113                 free(to_free);
 114                 return;
 115         }
 116
 117         strbuf_addstr(&template_path, template_dir);
 118         strbuf_complete(&template_path, '/');
 119         template_len = template_path.len;
 120
 121         dir = opendir(template_path.buf);
 122         if (!dir) {
 123                 warning(_("templates not found in %s"), template_dir);
 124                 goto free_return;
 125         }
 126
 127         /* Make sure that template is from the correct vintage */
 128         strbuf_addstr(&template_path, "config");
 129         read_repository_format(&template_format, template_path.buf);
 130         strbuf_setlen(&template_path, template_len);
 131
 132         /*
 133          * No mention of version at all is OK, but anything else should be
 134          * verified.
 135          */
 136         if (template_format.version >= 0 &&
 137             verify_repository_format(&template_format, &err) < 0) {
 138                 warning(_("not copying templates from '%s': %s"),
 139                           template_dir, err.buf);
 140                 strbuf_release(&err);
 141                 goto close_free_return;
 142         }
 143
 144         strbuf_addstr(&path, get_git_common_dir());
 145         strbuf_complete(&path, '/');
 146         copy_templates_1(&path, &template_path, dir);
 147 close_free_return:
 148         closedir(dir);
 149 free_return:
 150         free(to_free);
 151         strbuf_release(&path);
 152         strbuf_release(&template_path);
 153         clear_repository_format(&template_format);
 154 }
 155
 156 static int git_init_db_config(const char *k, const char *v, void *cb)
 157 {
 158         if (!strcmp(k, "init.templatedir"))
 159                 return git_config_pathname(&init_db_template_dir, k, v);
 160
 161         if (starts_with(k, "core."))
 162                 return platform_core_config(k, v, cb);
 163
 164         return 0;
 165 }
 166
 167 /*
 168  * If the git_dir is not directly inside the working tree, then git will not
 169  * find it by default, and we need to set the worktree explicitly.
 170  */
 171 static int needs_work_tree_config(const char *git_dir, const char *work_tree)
 172 {
 173         if (!strcmp(work_tree, "/") && !strcmp(git_dir, "/.git"))
 174                 return 0;
 175         if (skip_prefix(git_dir, work_tree, &git_dir) &&
 176             !strcmp(git_dir, "/.git"))
 177                 return 0;
 178         return 1;
 179 }
 180
 181 void initialize_repository_version(int hash_algo)
 182 {
 183         char repo_version_string[10];
 184         int repo_version = GIT_REPO_VERSION;
 185
 186 #ifndef ENABLE_SHA256
 187         if (hash_algo != GIT_HASH_SHA1)
 188                 die(_("The hash algorithm %s is not supported in this build."), hash_algos[hash_algo].name);
 189 #endif
 190
 191         if (hash_algo != GIT_HASH_SHA1)
 192                 repo_version = GIT_REPO_VERSION_READ;
 193
 194         /* This forces creation of new config file */
 195         xsnprintf(repo_version_string, sizeof(repo_version_string),
 196                   "%d", repo_version);
 197         git_config_set("core.repositoryformatversion", repo_version_string);
 198
 199         if (hash_algo != GIT_HASH_SHA1)
 200                 git_config_set("extensions.objectformat",
 201                                hash_algos[hash_algo].name);
 202 }
 203
 204 static int create_default_files(const char *template_path,
 205                                 const char *original_git_dir,
 206                                 const struct repository_format *fmt)
 207 {
 208         struct stat st1;
 209         struct strbuf buf = STRBUF_INIT;
 210         char *path;
 211         char junk[2];
 212         int reinit;
 213         int filemode;
 214         struct strbuf err = STRBUF_INIT;
 215
 216         /* Just look for `init.templatedir` */
 217         init_db_template_dir = NULL; /* re-set in case it was set before */
 218         git_config(git_init_db_config, NULL);
 219
 220         /*
 221          * First copy the templates -- we might have the default
 222          * config file there, in which case we would want to read
 223          * from it after installing.
 224          *
 225          * Before reading that config, we also need to clear out any cached
 226          * values (since we've just potentially changed what's available on
 227          * disk).
 228          */
 229         copy_templates(template_path);
 230         git_config_clear();
 231         reset_shared_repository();
 232         git_config(git_default_config, NULL);
 233
 234         /*
 235          * We must make sure command-line options continue to override any
 236          * values we might have just re-read from the config.
 237          */
 238         is_bare_repository_cfg = init_is_bare_repository;
 239         if (init_shared_repository != -1)
 240                 set_shared_repository(init_shared_repository);
 241
 242         /*
 243          * We would have created the above under user's umask -- under
 244          * shared-repository settings, we would need to fix them up.
 245          */
 246         if (get_shared_repository()) {
 247                 adjust_shared_perm(get_git_dir());
 248         }
 249
 250         /*
 251          * We need to create a "refs" dir in any case so that older
 252          * versions of git can tell that this is a repository.
 253          */
 254         safe_create_dir(git_path("refs"), 1);
 255         adjust_shared_perm(git_path("refs"));
 256
 257         if (refs_init_db(&err))
 258                 die("failed to set up refs db: %s", err.buf);
 259
 260         /*
 261          * Create the default symlink from ".git/HEAD" to the "master"
 262          * branch, if it does not exist yet.
 263          */
 264         path = git_path_buf(&buf, "HEAD");
 265         reinit = (!access(path, R_OK)
 266                   || readlink(path, junk, sizeof(junk)-1) != -1);
 267         if (!reinit) {
 268                 if (create_symref("HEAD", "refs/heads/master", NULL) < 0)
 269                         exit(1);
 270         }
 271
 272         initialize_repository_version(fmt->hash_algo);
 273
 274         /* Check filemode trustability */
 275         path = git_path_buf(&buf, "config");
 276         filemode = TEST_FILEMODE;
 277         if (TEST_FILEMODE && !lstat(path, &st1)) {
 278                 struct stat st2;
 279                 filemode = (!chmod(path, st1.st_mode ^ S_IXUSR) &&
 280                                 !lstat(path, &st2) &&
 281                                 st1.st_mode != st2.st_mode &&
 282                                 !chmod(path, st1.st_mode));
 283                 if (filemode && !reinit && (st1.st_mode & S_IXUSR))
 284                         filemode = 0;
 285         }
 286         git_config_set("core.filemode", filemode ? "true" : "false");
 287
 288         if (is_bare_repository())
 289                 git_config_set("core.bare", "true");
 290         else {
 291                 const char *work_tree = get_git_work_tree();
 292                 git_config_set("core.bare", "false");
 293                 /* allow template config file to override the default */
 294                 if (log_all_ref_updates == LOG_REFS_UNSET)
 295                         git_config_set("core.logallrefupdates", "true");
 296                 if (needs_work_tree_config(original_git_dir, work_tree))
 297                         git_config_set("core.worktree", work_tree);
 298         }
 299
 300         if (!reinit) {
 301                 /* Check if symlink is supported in the work tree */
 302                 path = git_path_buf(&buf, "tXXXXXX");
 303                 if (!close(xmkstemp(path)) &&
 304                     !unlink(path) &&
 305                     !symlink("testing", path) &&
 306                     !lstat(path, &st1) &&
 307                     S_ISLNK(st1.st_mode))
 308                         unlink(path); /* good */
 309                 else
 310                         git_config_set("core.symlinks", "false");
 311
 312                 /* Check if the filesystem is case-insensitive */
 313                 path = git_path_buf(&buf, "CoNfIg");
 314                 if (!access(path, F_OK))
 315                         git_config_set("core.ignorecase", "true");
 316                 probe_utf8_pathname_composition();
 317         }
 318
 319         strbuf_release(&buf);
 320         return reinit;
 321 }
 322
 323 static void create_object_directory(void)
 324 {
 325         struct strbuf path = STRBUF_INIT;
 326         size_t baselen;
 327
 328         strbuf_addstr(&path, get_object_directory());
 329         baselen = path.len;
 330
 331         safe_create_dir(path.buf, 1);
 332
 333         strbuf_setlen(&path, baselen);
 334         strbuf_addstr(&path, "/pack");
 335         safe_create_dir(path.buf, 1);
 336
 337         strbuf_setlen(&path, baselen);
 338         strbuf_addstr(&path, "/info");
 339         safe_create_dir(path.buf, 1);
 340
 341         strbuf_release(&path);
 342 }
 343
 344 static void separate_git_dir(const char *git_dir, const char *git_link)
 345 {
 346         struct stat st;
 347
 348         if (!stat(git_link, &st)) {
 349                 const char *src;
 350
 351                 if (S_ISREG(st.st_mode))
 352                         src = read_gitfile(git_link);
 353                 else if (S_ISDIR(st.st_mode))
 354                         src = git_link;
 355                 else
 356                         die(_("unable to handle file type %d"), (int)st.st_mode);
 357
 358                 if (rename(src, git_dir))
 359                         die_errno(_("unable to move %s to %s"), src, git_dir);
 360         }
 361
 362         write_file(git_link, "gitdir: %s", git_dir);
 363 }
 364
 365 static void validate_hash_algorithm(struct repository_format *repo_fmt, int hash)
 366 {
 367         const char *env = getenv(GIT_DEFAULT_HASH_ENVIRONMENT);
 368         /*
 369          * If we already have an initialized repo, don't allow the user to
 370          * specify a different algorithm, as that could cause corruption.
 371          * Otherwise, if the user has specified one on the command line, use it.
 372          */
 373         if (repo_fmt->version >= 0 && hash != GIT_HASH_UNKNOWN && hash != repo_fmt->hash_algo)
 374                 die(_("attempt to reinitialize repository with different hash"));
 375         else if (hash != GIT_HASH_UNKNOWN)
 376                 repo_fmt->hash_algo = hash;
 377         else if (env) {
 378                 int env_algo = hash_algo_by_name(env);
 379                 if (env_algo == GIT_HASH_UNKNOWN)
 380                         die(_("unknown hash algorithm '%s'"), env);
 381                 repo_fmt->hash_algo = env_algo;
 382         }
 383 }
 384
 385 int init_db(const char *git_dir, const char *real_git_dir,
 386             const char *template_dir, int hash, unsigned int flags)
 387 {
 388         int reinit;
 389         int exist_ok = flags & INIT_DB_EXIST_OK;
 390         char *original_git_dir = real_pathdup(git_dir, 1);
 391         struct repository_format repo_fmt = REPOSITORY_FORMAT_INIT;
 392
 393         if (real_git_dir) {
 394                 struct stat st;
 395
 396                 if (!exist_ok && !stat(git_dir, &st))
 397                         die(_("%s already exists"), git_dir);
 398
 399                 if (!exist_ok && !stat(real_git_dir, &st))
 400                         die(_("%s already exists"), real_git_dir);
 401
 402                 set_git_dir(real_git_dir, 1);
 403                 git_dir = get_git_dir();
 404                 separate_git_dir(git_dir, original_git_dir);
 405         }
 406         else {
 407                 set_git_dir(git_dir, 1);
 408                 git_dir = get_git_dir();
 409         }
 410         startup_info->have_repository = 1;
 411
 412         /* Just look for `core.hidedotfiles` */
 413         git_config(git_init_db_config, NULL);
 414
 415         safe_create_dir(git_dir, 0);
 416
 417         init_is_bare_repository = is_bare_repository();
 418
 419         /* Check to see if the repository version is right.
 420          * Note that a newly created repository does not have
 421          * config file, so this will not fail.  What we are catching
 422          * is an attempt to reinitialize new repository with an old tool.
 423          */
 424         check_repository_format(&repo_fmt);
 425
 426         validate_hash_algorithm(&repo_fmt, hash);
 427
 428         reinit = create_default_files(template_dir, original_git_dir, &repo_fmt);
 429
 430         create_object_directory();
 431
 432         if (get_shared_repository()) {
 433                 char buf[10];
 434                 /* We do not spell "group" and such, so that
 435                  * the configuration can be read by older version
 436                  * of git. Note, we use octal numbers for new share modes,
 437                  * and compatibility values for PERM_GROUP and
 438                  * PERM_EVERYBODY.
 439                  */
 440                 if (get_shared_repository() < 0)
 441                         /* force to the mode value */
 442                         xsnprintf(buf, sizeof(buf), "0%o", -get_shared_repository());
 443                 else if (get_shared_repository() == PERM_GROUP)
 444                         xsnprintf(buf, sizeof(buf), "%d", OLD_PERM_GROUP);
 445                 else if (get_shared_repository() == PERM_EVERYBODY)
 446                         xsnprintf(buf, sizeof(buf), "%d", OLD_PERM_EVERYBODY);
 447                 else
 448                         BUG("invalid value for shared_repository");
 449                 git_config_set("core.sharedrepository", buf);
 450                 git_config_set("receive.denyNonFastforwards", "true");
 451         }
 452
 453         if (!(flags & INIT_DB_QUIET)) {
 454                 int len = strlen(git_dir);
 455
 456                 if (reinit)
 457                         printf(get_shared_repository()
 458                                ? _("Reinitialized existing shared Git repository in %s%s\n")
 459                                : _("Reinitialized existing Git repository in %s%s\n"),
 460                                git_dir, len && git_dir[len-1] != '/' ? "/" : "");
 461                 else
 462                         printf(get_shared_repository()
 463                                ? _("Initialized empty shared Git repository in %s%s\n")
 464                                : _("Initialized empty Git repository in %s%s\n"),
 465                                git_dir, len && git_dir[len-1] != '/' ? "/" : "");
 466         }
 467
 468         free(original_git_dir);
 469         return 0;
 470 }
 471
 472 static int guess_repository_type(const char *git_dir)
 473 {
 474         const char *slash;
 475         char *cwd;
 476         int cwd_is_git_dir;
 477
 478         /*
 479          * "GIT_DIR=. git init" is always bare.
 480          * "GIT_DIR=`pwd` git init" too.
 481          */
 482         if (!strcmp(".", git_dir))
 483                 return 1;
 484         cwd = xgetcwd();
 485         cwd_is_git_dir = !strcmp(git_dir, cwd);
 486         free(cwd);
 487         if (cwd_is_git_dir)
 488                 return 1;
 489         /*
 490          * "GIT_DIR=.git or GIT_DIR=something/.git is usually not.
 491          */
 492         if (!strcmp(git_dir, ".git"))
 493                 return 0;
 494         slash = strrchr(git_dir, '/');
 495         if (slash && !strcmp(slash, "/.git"))
 496                 return 0;
 497
 498         /*
 499          * Otherwise it is often bare.  At this point
 500          * we are just guessing.
 501          */
 502         return 1;
 503 }
 504
 505 static int shared_callback(const struct option *opt, const char *arg, int unset)
 506 {
 507         BUG_ON_OPT_NEG(unset);
 508         *((int *) opt->value) = (arg) ? git_config_perm("arg", arg) : PERM_GROUP;
 509         return 0;
 510 }
 511
 512 static const char *const init_db_usage[] = {
 513         N_("git init [-q | --quiet] [--bare] [--template=<template-directory>] [--shared[=<permissions>]] [<directory>]"),
 514         NULL
 515 };
 516
 517 /*
 518  * If you want to, you can share the DB area with any number of branches.
 519  * That has advantages: you can save space by sharing all the SHA1 objects.
 520  * On the other hand, it might just make lookup slower and messier. You
 521  * be the judge.  The default case is to have one DB per managed directory.
 522  */
 523 int cmd_init_db(int argc, const char **argv, const char *prefix)
 524 {
 525         const char *git_dir;
 526         const char *real_git_dir = NULL;
 527         const char *work_tree;
 528         const char *template_dir = NULL;
 529         unsigned int flags = 0;
 530         const char *object_format = NULL;
 531         int hash_algo = GIT_HASH_UNKNOWN;
 532         const struct option init_db_options[] = {
 533                 OPT_STRING(0, "template", &template_dir, N_("template-directory"),
 534                                 N_("directory from which templates will be used")),
 535                 OPT_SET_INT(0, "bare", &is_bare_repository_cfg,
 536                                 N_("create a bare repository"), 1),
 537                 { OPTION_CALLBACK, 0, "shared", &init_shared_repository,
 538                         N_("permissions"),
 539                         N_("specify that the git repository is to be shared amongst several users"),
 540                         PARSE_OPT_OPTARG | PARSE_OPT_NONEG, shared_callback, 0},
 541                 OPT_BIT('q', "quiet", &flags, N_("be quiet"), INIT_DB_QUIET),
 542                 OPT_STRING(0, "separate-git-dir", &real_git_dir, N_("gitdir"),
 543                            N_("separate git dir from working tree")),
 544                 OPT_STRING(0, "object-format", &object_format, N_("hash"),
 545                            N_("specify the hash algorithm to use")),
 546                 OPT_END()
 547         };
 548
 549         argc = parse_options(argc, argv, prefix, init_db_options, init_db_usage, 0);
 550
 551         if (real_git_dir && !is_absolute_path(real_git_dir))
 552                 real_git_dir = real_pathdup(real_git_dir, 1);
 553
 554         if (template_dir && *template_dir && !is_absolute_path(template_dir))
 555                 template_dir = absolute_pathdup(template_dir);
 556
 557         if (argc == 1) {
 558                 int mkdir_tried = 0;
 559         retry:
 560                 if (chdir(argv[0]) < 0) {
 561                         if (!mkdir_tried) {
 562                                 int saved;
 563                                 /*
 564                                  * At this point we haven't read any configuration,
 565                                  * and we know shared_repository should always be 0;
 566                                  * but just in case we play safe.
 567                                  */
 568                                 saved = get_shared_repository();
 569                                 set_shared_repository(0);
 570                                 switch (safe_create_leading_directories_const(argv[0])) {
 571                                 case SCLD_OK:
 572                                 case SCLD_PERMS:
 573                                         break;
 574                                 case SCLD_EXISTS:
 575                                         errno = EEXIST;
 576                                         /* fallthru */
 577                                 default:
 578                                         die_errno(_("cannot mkdir %s"), argv[0]);
 579                                         break;
 580                                 }
 581                                 set_shared_repository(saved);
 582                                 if (mkdir(argv[0], 0777) < 0)
 583                                         die_errno(_("cannot mkdir %s"), argv[0]);
 584                                 mkdir_tried = 1;
 585                                 goto retry;
 586                         }
 587                         die_errno(_("cannot chdir to %s"), argv[0]);
 588                 }
 589         } else if (0 < argc) {
 590                 usage(init_db_usage[0]);
 591         }
 592         if (is_bare_repository_cfg == 1) {
 593                 char *cwd = xgetcwd();
 594                 setenv(GIT_DIR_ENVIRONMENT, cwd, argc > 0);
 595                 free(cwd);
 596         }
 597
 598         if (object_format) {
 599                 hash_algo = hash_algo_by_name(object_format);
 600                 if (hash_algo == GIT_HASH_UNKNOWN)
 601                         die(_("unknown hash algorithm '%s'"), object_format);
 602         }
 603
 604         if (init_shared_repository != -1)
 605                 set_shared_repository(init_shared_repository);
 606
 607         /*
 608          * GIT_WORK_TREE makes sense only in conjunction with GIT_DIR
 609          * without --bare.  Catch the error early.
 610          */
 611         git_dir = xstrdup_or_null(getenv(GIT_DIR_ENVIRONMENT));
 612         work_tree = xstrdup_or_null(getenv(GIT_WORK_TREE_ENVIRONMENT));
 613         if ((!git_dir || is_bare_repository_cfg == 1) && work_tree)
 614                 die(_("%s (or --work-tree=<directory>) not allowed without "
 615                           "specifying %s (or --git-dir=<directory>)"),
 616                     GIT_WORK_TREE_ENVIRONMENT,
 617                     GIT_DIR_ENVIRONMENT);
 618
 619         /*
 620          * Set up the default .git directory contents
 621          */
 622         if (!git_dir)
 623                 git_dir = DEFAULT_GIT_DIR_ENVIRONMENT;
 624
 625         if (is_bare_repository_cfg < 0)
 626                 is_bare_repository_cfg = guess_repository_type(git_dir);
 627
 628         if (!is_bare_repository_cfg) {
 629                 const char *git_dir_parent = strrchr(git_dir, '/');
 630                 if (git_dir_parent) {
 631                         char *rel = xstrndup(git_dir, git_dir_parent - git_dir);
 632                         git_work_tree_cfg = real_pathdup(rel, 1);
 633                         free(rel);
 634                 }
 635                 if (!git_work_tree_cfg)
 636                         git_work_tree_cfg = xgetcwd();
 637                 if (work_tree)
 638                         set_git_work_tree(work_tree);
 639                 else
 640                         set_git_work_tree(git_work_tree_cfg);
 641                 if (access(get_git_work_tree(), X_OK))
 642                         die_errno (_("Cannot access work tree '%s'"),
 643                                    get_git_work_tree());
 644         }
 645         else {
 646                 if (work_tree)
 647                         set_git_work_tree(work_tree);
 648         }
 649
 650         UNLEAK(real_git_dir);
 651         UNLEAK(git_dir);
 652         UNLEAK(work_tree);
 653
 654         flags |= INIT_DB_EXIST_OK;
 655         return init_db(git_dir, real_git_dir, template_dir, hash_algo, flags);
 656 }