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 char *initial_branch,
 207                                 const struct repository_format *fmt)
 208 {
 209         struct stat st1;
 210         struct strbuf buf = STRBUF_INIT;
 211         char *path;
 212         char junk[2];
 213         int reinit;
 214         int filemode;
 215         struct strbuf err = STRBUF_INIT;
 216
 217         /* Just look for `init.templatedir` */
 218         init_db_template_dir = NULL; /* re-set in case it was set before */
 219         git_config(git_init_db_config, NULL);
 220
 221         /*
 222          * First copy the templates -- we might have the default
 223          * config file there, in which case we would want to read
 224          * from it after installing.
 225          *
 226          * Before reading that config, we also need to clear out any cached
 227          * values (since we've just potentially changed what's available on
 228          * disk).
 229          */
 230         copy_templates(template_path);
 231         git_config_clear();
 232         reset_shared_repository();
 233         git_config(git_default_config, NULL);
 234
 235         /*
 236          * We must make sure command-line options continue to override any
 237          * values we might have just re-read from the config.
 238          */
 239         is_bare_repository_cfg = init_is_bare_repository;
 240         if (init_shared_repository != -1)
 241                 set_shared_repository(init_shared_repository);
 242
 243         /*
 244          * We would have created the above under user's umask -- under
 245          * shared-repository settings, we would need to fix them up.
 246          */
 247         if (get_shared_repository()) {
 248                 adjust_shared_perm(get_git_dir());
 249         }
 250
 251         /*
 252          * We need to create a "refs" dir in any case so that older
 253          * versions of git can tell that this is a repository.
 254          */
 255         safe_create_dir(git_path("refs"), 1);
 256         adjust_shared_perm(git_path("refs"));
 257
 258         if (refs_init_db(&err))
 259                 die("failed to set up refs db: %s", err.buf);
 260
 261         /*
 262          * Point the HEAD symref to the initial branch with if HEAD does
 263          * not yet exist.
 264          */
 265         path = git_path_buf(&buf, "HEAD");
 266         reinit = (!access(path, R_OK)
 267                   || readlink(path, junk, sizeof(junk)-1) != -1);
 268         if (!reinit) {
 269                 char *ref;
 270
 271                 if (!initial_branch)
 272                         initial_branch = git_default_branch_name();
 273
 274                 ref = xstrfmt("refs/heads/%s", initial_branch);
 275                 if (check_refname_format(ref, 0) < 0)
 276                         die(_("invalid initial branch name: '%s'"),
 277                             initial_branch);
 278
 279                 if (create_symref("HEAD", ref, NULL) < 0)
 280                         exit(1);
 281                 free(ref);
 282         }
 283
 284         initialize_repository_version(fmt->hash_algo);
 285
 286         /* Check filemode trustability */
 287         path = git_path_buf(&buf, "config");
 288         filemode = TEST_FILEMODE;
 289         if (TEST_FILEMODE && !lstat(path, &st1)) {
 290                 struct stat st2;
 291                 filemode = (!chmod(path, st1.st_mode ^ S_IXUSR) &&
 292                                 !lstat(path, &st2) &&
 293                                 st1.st_mode != st2.st_mode &&
 294                                 !chmod(path, st1.st_mode));
 295                 if (filemode && !reinit && (st1.st_mode & S_IXUSR))
 296                         filemode = 0;
 297         }
 298         git_config_set("core.filemode", filemode ? "true" : "false");
 299
 300         if (is_bare_repository())
 301                 git_config_set("core.bare", "true");
 302         else {
 303                 const char *work_tree = get_git_work_tree();
 304                 git_config_set("core.bare", "false");
 305                 /* allow template config file to override the default */
 306                 if (log_all_ref_updates == LOG_REFS_UNSET)
 307                         git_config_set("core.logallrefupdates", "true");
 308                 if (needs_work_tree_config(original_git_dir, work_tree))
 309                         git_config_set("core.worktree", work_tree);
 310         }
 311
 312         if (!reinit) {
 313                 /* Check if symlink is supported in the work tree */
 314                 path = git_path_buf(&buf, "tXXXXXX");
 315                 if (!close(xmkstemp(path)) &&
 316                     !unlink(path) &&
 317                     !symlink("testing", path) &&
 318                     !lstat(path, &st1) &&
 319                     S_ISLNK(st1.st_mode))
 320                         unlink(path); /* good */
 321                 else
 322                         git_config_set("core.symlinks", "false");
 323
 324                 /* Check if the filesystem is case-insensitive */
 325                 path = git_path_buf(&buf, "CoNfIg");
 326                 if (!access(path, F_OK))
 327                         git_config_set("core.ignorecase", "true");
 328                 probe_utf8_pathname_composition();
 329         }
 330
 331         strbuf_release(&buf);
 332         return reinit;
 333 }
 334
 335 static void create_object_directory(void)
 336 {
 337         struct strbuf path = STRBUF_INIT;
 338         size_t baselen;
 339
 340         strbuf_addstr(&path, get_object_directory());
 341         baselen = path.len;
 342
 343         safe_create_dir(path.buf, 1);
 344
 345         strbuf_setlen(&path, baselen);
 346         strbuf_addstr(&path, "/pack");
 347         safe_create_dir(path.buf, 1);
 348
 349         strbuf_setlen(&path, baselen);
 350         strbuf_addstr(&path, "/info");
 351         safe_create_dir(path.buf, 1);
 352
 353         strbuf_release(&path);
 354 }
 355
 356 static void separate_git_dir(const char *git_dir, const char *git_link)
 357 {
 358         struct stat st;
 359
 360         if (!stat(git_link, &st)) {
 361                 const char *src;
 362
 363                 if (S_ISREG(st.st_mode))
 364                         src = read_gitfile(git_link);
 365                 else if (S_ISDIR(st.st_mode))
 366                         src = git_link;
 367                 else
 368                         die(_("unable to handle file type %d"), (int)st.st_mode);
 369
 370                 if (rename(src, git_dir))
 371                         die_errno(_("unable to move %s to %s"), src, git_dir);
 372         }
 373
 374         write_file(git_link, "gitdir: %s", git_dir);
 375 }
 376
 377 static void validate_hash_algorithm(struct repository_format *repo_fmt, int hash)
 378 {
 379         const char *env = getenv(GIT_DEFAULT_HASH_ENVIRONMENT);
 380         /*
 381          * If we already have an initialized repo, don't allow the user to
 382          * specify a different algorithm, as that could cause corruption.
 383          * Otherwise, if the user has specified one on the command line, use it.
 384          */
 385         if (repo_fmt->version >= 0 && hash != GIT_HASH_UNKNOWN && hash != repo_fmt->hash_algo)
 386                 die(_("attempt to reinitialize repository with different hash"));
 387         else if (hash != GIT_HASH_UNKNOWN)
 388                 repo_fmt->hash_algo = hash;
 389         else if (env) {
 390                 int env_algo = hash_algo_by_name(env);
 391                 if (env_algo == GIT_HASH_UNKNOWN)
 392                         die(_("unknown hash algorithm '%s'"), env);
 393                 repo_fmt->hash_algo = env_algo;
 394         }
 395 }
 396
 397 int init_db(const char *git_dir, const char *real_git_dir,
 398             const char *template_dir, int hash, const char *initial_branch,
 399             unsigned int flags)
 400 {
 401         int reinit;
 402         int exist_ok = flags & INIT_DB_EXIST_OK;
 403         char *original_git_dir = real_pathdup(git_dir, 1);
 404         struct repository_format repo_fmt = REPOSITORY_FORMAT_INIT;
 405
 406         if (real_git_dir) {
 407                 struct stat st;
 408
 409                 if (!exist_ok && !stat(git_dir, &st))
 410                         die(_("%s already exists"), git_dir);
 411
 412                 if (!exist_ok && !stat(real_git_dir, &st))
 413                         die(_("%s already exists"), real_git_dir);
 414
 415                 set_git_dir(real_git_dir, 1);
 416                 git_dir = get_git_dir();
 417                 separate_git_dir(git_dir, original_git_dir);
 418         }
 419         else {
 420                 set_git_dir(git_dir, 1);
 421                 git_dir = get_git_dir();
 422         }
 423         startup_info->have_repository = 1;
 424
 425         /* Just look for `core.hidedotfiles` */
 426         git_config(git_init_db_config, NULL);
 427
 428         safe_create_dir(git_dir, 0);
 429
 430         init_is_bare_repository = is_bare_repository();
 431
 432         /* Check to see if the repository version is right.
 433          * Note that a newly created repository does not have
 434          * config file, so this will not fail.  What we are catching
 435          * is an attempt to reinitialize new repository with an old tool.
 436          */
 437         check_repository_format(&repo_fmt);
 438
 439         validate_hash_algorithm(&repo_fmt, hash);
 440
 441         reinit = create_default_files(template_dir, original_git_dir,
 442                                       initial_branch, &repo_fmt);
 443         if (reinit && initial_branch)
 444                 warning(_("re-init: ignored --initial-branch=%s"),
 445                         initial_branch);
 446
 447         create_object_directory();
 448
 449         if (get_shared_repository()) {
 450                 char buf[10];
 451                 /* We do not spell "group" and such, so that
 452                  * the configuration can be read by older version
 453                  * of git. Note, we use octal numbers for new share modes,
 454                  * and compatibility values for PERM_GROUP and
 455                  * PERM_EVERYBODY.
 456                  */
 457                 if (get_shared_repository() < 0)
 458                         /* force to the mode value */
 459                         xsnprintf(buf, sizeof(buf), "0%o", -get_shared_repository());
 460                 else if (get_shared_repository() == PERM_GROUP)
 461                         xsnprintf(buf, sizeof(buf), "%d", OLD_PERM_GROUP);
 462                 else if (get_shared_repository() == PERM_EVERYBODY)
 463                         xsnprintf(buf, sizeof(buf), "%d", OLD_PERM_EVERYBODY);
 464                 else
 465                         BUG("invalid value for shared_repository");
 466                 git_config_set("core.sharedrepository", buf);
 467                 git_config_set("receive.denyNonFastforwards", "true");
 468         }
 469
 470         if (!(flags & INIT_DB_QUIET)) {
 471                 int len = strlen(git_dir);
 472
 473                 if (reinit)
 474                         printf(get_shared_repository()
 475                                ? _("Reinitialized existing shared Git repository in %s%s\n")
 476                                : _("Reinitialized existing Git repository in %s%s\n"),
 477                                git_dir, len && git_dir[len-1] != '/' ? "/" : "");
 478                 else
 479                         printf(get_shared_repository()
 480                                ? _("Initialized empty shared Git repository in %s%s\n")
 481                                : _("Initialized empty Git repository in %s%s\n"),
 482                                git_dir, len && git_dir[len-1] != '/' ? "/" : "");
 483         }
 484
 485         free(original_git_dir);
 486         return 0;
 487 }
 488
 489 static int guess_repository_type(const char *git_dir)
 490 {
 491         const char *slash;
 492         char *cwd;
 493         int cwd_is_git_dir;
 494
 495         /*
 496          * "GIT_DIR=. git init" is always bare.
 497          * "GIT_DIR=`pwd` git init" too.
 498          */
 499         if (!strcmp(".", git_dir))
 500                 return 1;
 501         cwd = xgetcwd();
 502         cwd_is_git_dir = !strcmp(git_dir, cwd);
 503         free(cwd);
 504         if (cwd_is_git_dir)
 505                 return 1;
 506         /*
 507          * "GIT_DIR=.git or GIT_DIR=something/.git is usually not.
 508          */
 509         if (!strcmp(git_dir, ".git"))
 510                 return 0;
 511         slash = strrchr(git_dir, '/');
 512         if (slash && !strcmp(slash, "/.git"))
 513                 return 0;
 514
 515         /*
 516          * Otherwise it is often bare.  At this point
 517          * we are just guessing.
 518          */
 519         return 1;
 520 }
 521
 522 static int shared_callback(const struct option *opt, const char *arg, int unset)
 523 {
 524         BUG_ON_OPT_NEG(unset);
 525         *((int *) opt->value) = (arg) ? git_config_perm("arg", arg) : PERM_GROUP;
 526         return 0;
 527 }
 528
 529 static const char *const init_db_usage[] = {
 530         N_("git init [-q | --quiet] [--bare] [--template=<template-directory>] [--shared[=<permissions>]] [<directory>]"),
 531         NULL
 532 };
 533
 534 /*
 535  * If you want to, you can share the DB area with any number of branches.
 536  * That has advantages: you can save space by sharing all the SHA1 objects.
 537  * On the other hand, it might just make lookup slower and messier. You
 538  * be the judge.  The default case is to have one DB per managed directory.
 539  */
 540 int cmd_init_db(int argc, const char **argv, const char *prefix)
 541 {
 542         const char *git_dir;
 543         const char *real_git_dir = NULL;
 544         const char *work_tree;
 545         const char *template_dir = NULL;
 546         unsigned int flags = 0;
 547         const char *object_format = NULL;
 548         const char *initial_branch = NULL;
 549         int hash_algo = GIT_HASH_UNKNOWN;
 550         const struct option init_db_options[] = {
 551                 OPT_STRING(0, "template", &template_dir, N_("template-directory"),
 552                                 N_("directory from which templates will be used")),
 553                 OPT_SET_INT(0, "bare", &is_bare_repository_cfg,
 554                                 N_("create a bare repository"), 1),
 555                 { OPTION_CALLBACK, 0, "shared", &init_shared_repository,
 556                         N_("permissions"),
 557                         N_("specify that the git repository is to be shared amongst several users"),
 558                         PARSE_OPT_OPTARG | PARSE_OPT_NONEG, shared_callback, 0},
 559                 OPT_BIT('q', "quiet", &flags, N_("be quiet"), INIT_DB_QUIET),
 560                 OPT_STRING(0, "separate-git-dir", &real_git_dir, N_("gitdir"),
 561                            N_("separate git dir from working tree")),
 562                 OPT_STRING('b', "initial-branch", &initial_branch, N_("name"),
 563                            N_("override the name of the initial branch")),
 564                 OPT_STRING(0, "object-format", &object_format, N_("hash"),
 565                            N_("specify the hash algorithm to use")),
 566                 OPT_END()
 567         };
 568
 569         argc = parse_options(argc, argv, prefix, init_db_options, init_db_usage, 0);
 570
 571         if (real_git_dir && !is_absolute_path(real_git_dir))
 572                 real_git_dir = real_pathdup(real_git_dir, 1);
 573
 574         if (template_dir && *template_dir && !is_absolute_path(template_dir))
 575                 template_dir = absolute_pathdup(template_dir);
 576
 577         if (argc == 1) {
 578                 int mkdir_tried = 0;
 579         retry:
 580                 if (chdir(argv[0]) < 0) {
 581                         if (!mkdir_tried) {
 582                                 int saved;
 583                                 /*
 584                                  * At this point we haven't read any configuration,
 585                                  * and we know shared_repository should always be 0;
 586                                  * but just in case we play safe.
 587                                  */
 588                                 saved = get_shared_repository();
 589                                 set_shared_repository(0);
 590                                 switch (safe_create_leading_directories_const(argv[0])) {
 591                                 case SCLD_OK:
 592                                 case SCLD_PERMS:
 593                                         break;
 594                                 case SCLD_EXISTS:
 595                                         errno = EEXIST;
 596                                         /* fallthru */
 597                                 default:
 598                                         die_errno(_("cannot mkdir %s"), argv[0]);
 599                                         break;
 600                                 }
 601                                 set_shared_repository(saved);
 602                                 if (mkdir(argv[0], 0777) < 0)
 603                                         die_errno(_("cannot mkdir %s"), argv[0]);
 604                                 mkdir_tried = 1;
 605                                 goto retry;
 606                         }
 607                         die_errno(_("cannot chdir to %s"), argv[0]);
 608                 }
 609         } else if (0 < argc) {
 610                 usage(init_db_usage[0]);
 611         }
 612         if (is_bare_repository_cfg == 1) {
 613                 char *cwd = xgetcwd();
 614                 setenv(GIT_DIR_ENVIRONMENT, cwd, argc > 0);
 615                 free(cwd);
 616         }
 617
 618         if (object_format) {
 619                 hash_algo = hash_algo_by_name(object_format);
 620                 if (hash_algo == GIT_HASH_UNKNOWN)
 621                         die(_("unknown hash algorithm '%s'"), object_format);
 622         }
 623
 624         if (init_shared_repository != -1)
 625                 set_shared_repository(init_shared_repository);
 626
 627         /*
 628          * GIT_WORK_TREE makes sense only in conjunction with GIT_DIR
 629          * without --bare.  Catch the error early.
 630          */
 631         git_dir = xstrdup_or_null(getenv(GIT_DIR_ENVIRONMENT));
 632         work_tree = xstrdup_or_null(getenv(GIT_WORK_TREE_ENVIRONMENT));
 633         if ((!git_dir || is_bare_repository_cfg == 1) && work_tree)
 634                 die(_("%s (or --work-tree=<directory>) not allowed without "
 635                           "specifying %s (or --git-dir=<directory>)"),
 636                     GIT_WORK_TREE_ENVIRONMENT,
 637                     GIT_DIR_ENVIRONMENT);
 638
 639         /*
 640          * Set up the default .git directory contents
 641          */
 642         if (!git_dir)
 643                 git_dir = DEFAULT_GIT_DIR_ENVIRONMENT;
 644
 645         if (is_bare_repository_cfg < 0)
 646                 is_bare_repository_cfg = guess_repository_type(git_dir);
 647
 648         if (!is_bare_repository_cfg) {
 649                 const char *git_dir_parent = strrchr(git_dir, '/');
 650                 if (git_dir_parent) {
 651                         char *rel = xstrndup(git_dir, git_dir_parent - git_dir);
 652                         git_work_tree_cfg = real_pathdup(rel, 1);
 653                         free(rel);
 654                 }
 655                 if (!git_work_tree_cfg)
 656                         git_work_tree_cfg = xgetcwd();
 657                 if (work_tree)
 658                         set_git_work_tree(work_tree);
 659                 else
 660                         set_git_work_tree(git_work_tree_cfg);
 661                 if (access(get_git_work_tree(), X_OK))
 662                         die_errno (_("Cannot access work tree '%s'"),
 663                                    get_git_work_tree());
 664         }
 665         else {
 666                 if (work_tree)
 667                         set_git_work_tree(work_tree);
 668         }
 669
 670         UNLEAK(real_git_dir);
 671         UNLEAK(git_dir);
 672         UNLEAK(work_tree);
 673
 674         flags |= INIT_DB_EXIST_OK;
 675         return init_db(git_dir, real_git_dir, template_dir, hash_algo,
 676                        initial_branch, flags);
 677 }