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         if (hash_algo != GIT_HASH_SHA1)
 187                 repo_version = GIT_REPO_VERSION_READ;
 188
 189         /* This forces creation of new config file */
 190         xsnprintf(repo_version_string, sizeof(repo_version_string),
 191                   "%d", repo_version);
 192         git_config_set("core.repositoryformatversion", repo_version_string);
 193
 194         if (hash_algo != GIT_HASH_SHA1)
 195                 git_config_set("extensions.objectformat",
 196                                hash_algos[hash_algo].name);
 197 }
 198
 199 static int create_default_files(const char *template_path,
 200                                 const char *original_git_dir,
 201                                 const char *initial_branch,
 202                                 const struct repository_format *fmt)
 203 {
 204         struct stat st1;
 205         struct strbuf buf = STRBUF_INIT;
 206         char *path;
 207         char junk[2];
 208         int reinit;
 209         int filemode;
 210         struct strbuf err = STRBUF_INIT;
 211
 212         /* Just look for `init.templatedir` */
 213         init_db_template_dir = NULL; /* re-set in case it was set before */
 214         git_config(git_init_db_config, NULL);
 215
 216         /*
 217          * First copy the templates -- we might have the default
 218          * config file there, in which case we would want to read
 219          * from it after installing.
 220          *
 221          * Before reading that config, we also need to clear out any cached
 222          * values (since we've just potentially changed what's available on
 223          * disk).
 224          */
 225         copy_templates(template_path);
 226         git_config_clear();
 227         reset_shared_repository();
 228         git_config(git_default_config, NULL);
 229
 230         /*
 231          * We must make sure command-line options continue to override any
 232          * values we might have just re-read from the config.
 233          */
 234         is_bare_repository_cfg = init_is_bare_repository;
 235         if (init_shared_repository != -1)
 236                 set_shared_repository(init_shared_repository);
 237
 238         /*
 239          * We would have created the above under user's umask -- under
 240          * shared-repository settings, we would need to fix them up.
 241          */
 242         if (get_shared_repository()) {
 243                 adjust_shared_perm(get_git_dir());
 244         }
 245
 246         /*
 247          * We need to create a "refs" dir in any case so that older
 248          * versions of git can tell that this is a repository.
 249          */
 250         safe_create_dir(git_path("refs"), 1);
 251         adjust_shared_perm(git_path("refs"));
 252
 253         if (refs_init_db(&err))
 254                 die("failed to set up refs db: %s", err.buf);
 255
 256         /*
 257          * Point the HEAD symref to the initial branch with if HEAD does
 258          * not yet exist.
 259          */
 260         path = git_path_buf(&buf, "HEAD");
 261         reinit = (!access(path, R_OK)
 262                   || readlink(path, junk, sizeof(junk)-1) != -1);
 263         if (!reinit) {
 264                 char *ref;
 265
 266                 if (!initial_branch)
 267                         initial_branch = git_default_branch_name();
 268
 269                 ref = xstrfmt("refs/heads/%s", initial_branch);
 270                 if (check_refname_format(ref, 0) < 0)
 271                         die(_("invalid initial branch name: '%s'"),
 272                             initial_branch);
 273
 274                 if (create_symref("HEAD", ref, NULL) < 0)
 275                         exit(1);
 276                 free(ref);
 277         }
 278
 279         initialize_repository_version(fmt->hash_algo);
 280
 281         /* Check filemode trustability */
 282         path = git_path_buf(&buf, "config");
 283         filemode = TEST_FILEMODE;
 284         if (TEST_FILEMODE && !lstat(path, &st1)) {
 285                 struct stat st2;
 286                 filemode = (!chmod(path, st1.st_mode ^ S_IXUSR) &&
 287                                 !lstat(path, &st2) &&
 288                                 st1.st_mode != st2.st_mode &&
 289                                 !chmod(path, st1.st_mode));
 290                 if (filemode && !reinit && (st1.st_mode & S_IXUSR))
 291                         filemode = 0;
 292         }
 293         git_config_set("core.filemode", filemode ? "true" : "false");
 294
 295         if (is_bare_repository())
 296                 git_config_set("core.bare", "true");
 297         else {
 298                 const char *work_tree = get_git_work_tree();
 299                 git_config_set("core.bare", "false");
 300                 /* allow template config file to override the default */
 301                 if (log_all_ref_updates == LOG_REFS_UNSET)
 302                         git_config_set("core.logallrefupdates", "true");
 303                 if (needs_work_tree_config(original_git_dir, work_tree))
 304                         git_config_set("core.worktree", work_tree);
 305         }
 306
 307         if (!reinit) {
 308                 /* Check if symlink is supported in the work tree */
 309                 path = git_path_buf(&buf, "tXXXXXX");
 310                 if (!close(xmkstemp(path)) &&
 311                     !unlink(path) &&
 312                     !symlink("testing", path) &&
 313                     !lstat(path, &st1) &&
 314                     S_ISLNK(st1.st_mode))
 315                         unlink(path); /* good */
 316                 else
 317                         git_config_set("core.symlinks", "false");
 318
 319                 /* Check if the filesystem is case-insensitive */
 320                 path = git_path_buf(&buf, "CoNfIg");
 321                 if (!access(path, F_OK))
 322                         git_config_set("core.ignorecase", "true");
 323                 probe_utf8_pathname_composition();
 324         }
 325
 326         strbuf_release(&buf);
 327         return reinit;
 328 }
 329
 330 static void create_object_directory(void)
 331 {
 332         struct strbuf path = STRBUF_INIT;
 333         size_t baselen;
 334
 335         strbuf_addstr(&path, get_object_directory());
 336         baselen = path.len;
 337
 338         safe_create_dir(path.buf, 1);
 339
 340         strbuf_setlen(&path, baselen);
 341         strbuf_addstr(&path, "/pack");
 342         safe_create_dir(path.buf, 1);
 343
 344         strbuf_setlen(&path, baselen);
 345         strbuf_addstr(&path, "/info");
 346         safe_create_dir(path.buf, 1);
 347
 348         strbuf_release(&path);
 349 }
 350
 351 static void separate_git_dir(const char *git_dir, const char *git_link)
 352 {
 353         struct stat st;
 354
 355         if (!stat(git_link, &st)) {
 356                 const char *src;
 357
 358                 if (S_ISREG(st.st_mode))
 359                         src = read_gitfile(git_link);
 360                 else if (S_ISDIR(st.st_mode))
 361                         src = git_link;
 362                 else
 363                         die(_("unable to handle file type %d"), (int)st.st_mode);
 364
 365                 if (rename(src, git_dir))
 366                         die_errno(_("unable to move %s to %s"), src, git_dir);
 367         }
 368
 369         write_file(git_link, "gitdir: %s", git_dir);
 370 }
 371
 372 static void validate_hash_algorithm(struct repository_format *repo_fmt, int hash)
 373 {
 374         const char *env = getenv(GIT_DEFAULT_HASH_ENVIRONMENT);
 375         /*
 376          * If we already have an initialized repo, don't allow the user to
 377          * specify a different algorithm, as that could cause corruption.
 378          * Otherwise, if the user has specified one on the command line, use it.
 379          */
 380         if (repo_fmt->version >= 0 && hash != GIT_HASH_UNKNOWN && hash != repo_fmt->hash_algo)
 381                 die(_("attempt to reinitialize repository with different hash"));
 382         else if (hash != GIT_HASH_UNKNOWN)
 383                 repo_fmt->hash_algo = hash;
 384         else if (env) {
 385                 int env_algo = hash_algo_by_name(env);
 386                 if (env_algo == GIT_HASH_UNKNOWN)
 387                         die(_("unknown hash algorithm '%s'"), env);
 388                 repo_fmt->hash_algo = env_algo;
 389         }
 390 }
 391
 392 int init_db(const char *git_dir, const char *real_git_dir,
 393             const char *template_dir, int hash, const char *initial_branch,
 394             unsigned int flags)
 395 {
 396         int reinit;
 397         int exist_ok = flags & INIT_DB_EXIST_OK;
 398         char *original_git_dir = real_pathdup(git_dir, 1);
 399         struct repository_format repo_fmt = REPOSITORY_FORMAT_INIT;
 400
 401         if (real_git_dir) {
 402                 struct stat st;
 403
 404                 if (!exist_ok && !stat(git_dir, &st))
 405                         die(_("%s already exists"), git_dir);
 406
 407                 if (!exist_ok && !stat(real_git_dir, &st))
 408                         die(_("%s already exists"), real_git_dir);
 409
 410                 set_git_dir(real_git_dir, 1);
 411                 git_dir = get_git_dir();
 412                 separate_git_dir(git_dir, original_git_dir);
 413         }
 414         else {
 415                 set_git_dir(git_dir, 1);
 416                 git_dir = get_git_dir();
 417         }
 418         startup_info->have_repository = 1;
 419
 420         /* Just look for `core.hidedotfiles` */
 421         git_config(git_init_db_config, NULL);
 422
 423         safe_create_dir(git_dir, 0);
 424
 425         init_is_bare_repository = is_bare_repository();
 426
 427         /* Check to see if the repository version is right.
 428          * Note that a newly created repository does not have
 429          * config file, so this will not fail.  What we are catching
 430          * is an attempt to reinitialize new repository with an old tool.
 431          */
 432         check_repository_format(&repo_fmt);
 433
 434         validate_hash_algorithm(&repo_fmt, hash);
 435
 436         reinit = create_default_files(template_dir, original_git_dir,
 437                                       initial_branch, &repo_fmt);
 438         if (reinit && initial_branch)
 439                 warning(_("re-init: ignored --initial-branch=%s"),
 440                         initial_branch);
 441
 442         create_object_directory();
 443
 444         if (get_shared_repository()) {
 445                 char buf[10];
 446                 /* We do not spell "group" and such, so that
 447                  * the configuration can be read by older version
 448                  * of git. Note, we use octal numbers for new share modes,
 449                  * and compatibility values for PERM_GROUP and
 450                  * PERM_EVERYBODY.
 451                  */
 452                 if (get_shared_repository() < 0)
 453                         /* force to the mode value */
 454                         xsnprintf(buf, sizeof(buf), "0%o", -get_shared_repository());
 455                 else if (get_shared_repository() == PERM_GROUP)
 456                         xsnprintf(buf, sizeof(buf), "%d", OLD_PERM_GROUP);
 457                 else if (get_shared_repository() == PERM_EVERYBODY)
 458                         xsnprintf(buf, sizeof(buf), "%d", OLD_PERM_EVERYBODY);
 459                 else
 460                         BUG("invalid value for shared_repository");
 461                 git_config_set("core.sharedrepository", buf);
 462                 git_config_set("receive.denyNonFastforwards", "true");
 463         }
 464
 465         if (!(flags & INIT_DB_QUIET)) {
 466                 int len = strlen(git_dir);
 467
 468                 if (reinit)
 469                         printf(get_shared_repository()
 470                                ? _("Reinitialized existing shared Git repository in %s%s\n")
 471                                : _("Reinitialized existing Git repository in %s%s\n"),
 472                                git_dir, len && git_dir[len-1] != '/' ? "/" : "");
 473                 else
 474                         printf(get_shared_repository()
 475                                ? _("Initialized empty shared Git repository in %s%s\n")
 476                                : _("Initialized empty Git repository in %s%s\n"),
 477                                git_dir, len && git_dir[len-1] != '/' ? "/" : "");
 478         }
 479
 480         free(original_git_dir);
 481         return 0;
 482 }
 483
 484 static int guess_repository_type(const char *git_dir)
 485 {
 486         const char *slash;
 487         char *cwd;
 488         int cwd_is_git_dir;
 489
 490         /*
 491          * "GIT_DIR=. git init" is always bare.
 492          * "GIT_DIR=`pwd` git init" too.
 493          */
 494         if (!strcmp(".", git_dir))
 495                 return 1;
 496         cwd = xgetcwd();
 497         cwd_is_git_dir = !strcmp(git_dir, cwd);
 498         free(cwd);
 499         if (cwd_is_git_dir)
 500                 return 1;
 501         /*
 502          * "GIT_DIR=.git or GIT_DIR=something/.git is usually not.
 503          */
 504         if (!strcmp(git_dir, ".git"))
 505                 return 0;
 506         slash = strrchr(git_dir, '/');
 507         if (slash && !strcmp(slash, "/.git"))
 508                 return 0;
 509
 510         /*
 511          * Otherwise it is often bare.  At this point
 512          * we are just guessing.
 513          */
 514         return 1;
 515 }
 516
 517 static int shared_callback(const struct option *opt, const char *arg, int unset)
 518 {
 519         BUG_ON_OPT_NEG(unset);
 520         *((int *) opt->value) = (arg) ? git_config_perm("arg", arg) : PERM_GROUP;
 521         return 0;
 522 }
 523
 524 static const char *const init_db_usage[] = {
 525         N_("git init [-q | --quiet] [--bare] [--template=<template-directory>] [--shared[=<permissions>]] [<directory>]"),
 526         NULL
 527 };
 528
 529 /*
 530  * If you want to, you can share the DB area with any number of branches.
 531  * That has advantages: you can save space by sharing all the SHA1 objects.
 532  * On the other hand, it might just make lookup slower and messier. You
 533  * be the judge.  The default case is to have one DB per managed directory.
 534  */
 535 int cmd_init_db(int argc, const char **argv, const char *prefix)
 536 {
 537         const char *git_dir;
 538         const char *real_git_dir = NULL;
 539         const char *work_tree;
 540         const char *template_dir = NULL;
 541         unsigned int flags = 0;
 542         const char *object_format = NULL;
 543         const char *initial_branch = NULL;
 544         int hash_algo = GIT_HASH_UNKNOWN;
 545         const struct option init_db_options[] = {
 546                 OPT_STRING(0, "template", &template_dir, N_("template-directory"),
 547                                 N_("directory from which templates will be used")),
 548                 OPT_SET_INT(0, "bare", &is_bare_repository_cfg,
 549                                 N_("create a bare repository"), 1),
 550                 { OPTION_CALLBACK, 0, "shared", &init_shared_repository,
 551                         N_("permissions"),
 552                         N_("specify that the git repository is to be shared amongst several users"),
 553                         PARSE_OPT_OPTARG | PARSE_OPT_NONEG, shared_callback, 0},
 554                 OPT_BIT('q', "quiet", &flags, N_("be quiet"), INIT_DB_QUIET),
 555                 OPT_STRING(0, "separate-git-dir", &real_git_dir, N_("gitdir"),
 556                            N_("separate git dir from working tree")),
 557                 OPT_STRING('b', "initial-branch", &initial_branch, N_("name"),
 558                            N_("override the name of the initial branch")),
 559                 OPT_STRING(0, "object-format", &object_format, N_("hash"),
 560                            N_("specify the hash algorithm to use")),
 561                 OPT_END()
 562         };
 563
 564         argc = parse_options(argc, argv, prefix, init_db_options, init_db_usage, 0);
 565
 566         if (real_git_dir && is_bare_repository_cfg == 1)
 567                 die(_("--separate-git-dir and --bare are mutually exclusive"));
 568
 569         if (real_git_dir && !is_absolute_path(real_git_dir))
 570                 real_git_dir = real_pathdup(real_git_dir, 1);
 571
 572         if (template_dir && *template_dir && !is_absolute_path(template_dir))
 573                 template_dir = absolute_pathdup(template_dir);
 574
 575         if (argc == 1) {
 576                 int mkdir_tried = 0;
 577         retry:
 578                 if (chdir(argv[0]) < 0) {
 579                         if (!mkdir_tried) {
 580                                 int saved;
 581                                 /*
 582                                  * At this point we haven't read any configuration,
 583                                  * and we know shared_repository should always be 0;
 584                                  * but just in case we play safe.
 585                                  */
 586                                 saved = get_shared_repository();
 587                                 set_shared_repository(0);
 588                                 switch (safe_create_leading_directories_const(argv[0])) {
 589                                 case SCLD_OK:
 590                                 case SCLD_PERMS:
 591                                         break;
 592                                 case SCLD_EXISTS:
 593                                         errno = EEXIST;
 594                                         /* fallthru */
 595                                 default:
 596                                         die_errno(_("cannot mkdir %s"), argv[0]);
 597                                         break;
 598                                 }
 599                                 set_shared_repository(saved);
 600                                 if (mkdir(argv[0], 0777) < 0)
 601                                         die_errno(_("cannot mkdir %s"), argv[0]);
 602                                 mkdir_tried = 1;
 603                                 goto retry;
 604                         }
 605                         die_errno(_("cannot chdir to %s"), argv[0]);
 606                 }
 607         } else if (0 < argc) {
 608                 usage(init_db_usage[0]);
 609         }
 610         if (is_bare_repository_cfg == 1) {
 611                 char *cwd = xgetcwd();
 612                 setenv(GIT_DIR_ENVIRONMENT, cwd, argc > 0);
 613                 free(cwd);
 614         }
 615
 616         if (object_format) {
 617                 hash_algo = hash_algo_by_name(object_format);
 618                 if (hash_algo == GIT_HASH_UNKNOWN)
 619                         die(_("unknown hash algorithm '%s'"), object_format);
 620         }
 621
 622         if (init_shared_repository != -1)
 623                 set_shared_repository(init_shared_repository);
 624
 625         /*
 626          * GIT_WORK_TREE makes sense only in conjunction with GIT_DIR
 627          * without --bare.  Catch the error early.
 628          */
 629         git_dir = xstrdup_or_null(getenv(GIT_DIR_ENVIRONMENT));
 630         work_tree = xstrdup_or_null(getenv(GIT_WORK_TREE_ENVIRONMENT));
 631         if ((!git_dir || is_bare_repository_cfg == 1) && work_tree)
 632                 die(_("%s (or --work-tree=<directory>) not allowed without "
 633                           "specifying %s (or --git-dir=<directory>)"),
 634                     GIT_WORK_TREE_ENVIRONMENT,
 635                     GIT_DIR_ENVIRONMENT);
 636
 637         /*
 638          * Set up the default .git directory contents
 639          */
 640         if (!git_dir)
 641                 git_dir = DEFAULT_GIT_DIR_ENVIRONMENT;
 642
 643         if (is_bare_repository_cfg < 0)
 644                 is_bare_repository_cfg = guess_repository_type(git_dir);
 645
 646         if (!is_bare_repository_cfg) {
 647                 const char *git_dir_parent = strrchr(git_dir, '/');
 648                 if (git_dir_parent) {
 649                         char *rel = xstrndup(git_dir, git_dir_parent - git_dir);
 650                         git_work_tree_cfg = real_pathdup(rel, 1);
 651                         free(rel);
 652                 }
 653                 if (!git_work_tree_cfg)
 654                         git_work_tree_cfg = xgetcwd();
 655                 if (work_tree)
 656                         set_git_work_tree(work_tree);
 657                 else
 658                         set_git_work_tree(git_work_tree_cfg);
 659                 if (access(get_git_work_tree(), X_OK))
 660                         die_errno (_("Cannot access work tree '%s'"),
 661                                    get_git_work_tree());
 662         }
 663         else {
 664                 if (real_git_dir)
 665                         die(_("--separate-git-dir incompatible with bare repository"));
 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 }