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 #include "worktree.h"
  13
  14 #ifdef NO_TRUSTABLE_FILEMODE
  15 #define TEST_FILEMODE 0
  16 #else
  17 #define TEST_FILEMODE 1
  18 #endif
  19
  20 #define GIT_DEFAULT_HASH_ENVIRONMENT "GIT_DEFAULT_HASH"
  21
  22 static int init_is_bare_repository = 0;
  23 static int init_shared_repository = -1;
  24
  25 static void copy_templates_1(struct strbuf *path, struct strbuf *template_path,
  26                              DIR *dir)
  27 {
  28         size_t path_baselen = path->len;
  29         size_t template_baselen = template_path->len;
  30         struct dirent *de;
  31
  32         /* Note: if ".git/hooks" file exists in the repository being
  33          * re-initialized, /etc/core-git/templates/hooks/update would
  34          * cause "git init" to fail here.  I think this is sane but
  35          * it means that the set of templates we ship by default, along
  36          * with the way the namespace under .git/ is organized, should
  37          * be really carefully chosen.
  38          */
  39         safe_create_dir(path->buf, 1);
  40         while ((de = readdir(dir)) != NULL) {
  41                 struct stat st_git, st_template;
  42                 int exists = 0;
  43
  44                 strbuf_setlen(path, path_baselen);
  45                 strbuf_setlen(template_path, template_baselen);
  46
  47                 if (de->d_name[0] == '.')
  48                         continue;
  49                 strbuf_addstr(path, de->d_name);
  50                 strbuf_addstr(template_path, de->d_name);
  51                 if (lstat(path->buf, &st_git)) {
  52                         if (errno != ENOENT)
  53                                 die_errno(_("cannot stat '%s'"), path->buf);
  54                 }
  55                 else
  56                         exists = 1;
  57
  58                 if (lstat(template_path->buf, &st_template))
  59                         die_errno(_("cannot stat template '%s'"), template_path->buf);
  60
  61                 if (S_ISDIR(st_template.st_mode)) {
  62                         DIR *subdir = opendir(template_path->buf);
  63                         if (!subdir)
  64                                 die_errno(_("cannot opendir '%s'"), template_path->buf);
  65                         strbuf_addch(path, '/');
  66                         strbuf_addch(template_path, '/');
  67                         copy_templates_1(path, template_path, subdir);
  68                         closedir(subdir);
  69                 }
  70                 else if (exists)
  71                         continue;
  72                 else if (S_ISLNK(st_template.st_mode)) {
  73                         struct strbuf lnk = STRBUF_INIT;
  74                         if (strbuf_readlink(&lnk, template_path->buf,
  75                                             st_template.st_size) < 0)
  76                                 die_errno(_("cannot readlink '%s'"), template_path->buf);
  77                         if (symlink(lnk.buf, path->buf))
  78                                 die_errno(_("cannot symlink '%s' '%s'"),
  79                                           lnk.buf, path->buf);
  80                         strbuf_release(&lnk);
  81                 }
  82                 else if (S_ISREG(st_template.st_mode)) {
  83                         if (copy_file(path->buf, template_path->buf, st_template.st_mode))
  84                                 die_errno(_("cannot copy '%s' to '%s'"),
  85                                           template_path->buf, path->buf);
  86                 }
  87                 else
  88                         error(_("ignoring template %s"), template_path->buf);
  89         }
  90 }
  91
  92 static void copy_templates(const char *option_template)
  93 {
  94         const char *template_dir = get_template_dir(option_template);
  95         struct strbuf path = STRBUF_INIT;
  96         struct strbuf template_path = STRBUF_INIT;
  97         size_t template_len;
  98         struct repository_format template_format = REPOSITORY_FORMAT_INIT;
  99         struct strbuf err = STRBUF_INIT;
 100         DIR *dir;
 101         char *to_free = NULL;
 102
 103         if (!template_dir || !*template_dir)
 104                 return;
 105
 106         strbuf_addstr(&template_path, template_dir);
 107         strbuf_complete(&template_path, '/');
 108         template_len = template_path.len;
 109
 110         dir = opendir(template_path.buf);
 111         if (!dir) {
 112                 warning(_("templates not found in %s"), template_dir);
 113                 goto free_return;
 114         }
 115
 116         /* Make sure that template is from the correct vintage */
 117         strbuf_addstr(&template_path, "config");
 118         read_repository_format(&template_format, template_path.buf);
 119         strbuf_setlen(&template_path, template_len);
 120
 121         /*
 122          * No mention of version at all is OK, but anything else should be
 123          * verified.
 124          */
 125         if (template_format.version >= 0 &&
 126             verify_repository_format(&template_format, &err) < 0) {
 127                 warning(_("not copying templates from '%s': %s"),
 128                           template_dir, err.buf);
 129                 strbuf_release(&err);
 130                 goto close_free_return;
 131         }
 132
 133         strbuf_addstr(&path, get_git_common_dir());
 134         strbuf_complete(&path, '/');
 135         copy_templates_1(&path, &template_path, dir);
 136 close_free_return:
 137         closedir(dir);
 138 free_return:
 139         free(to_free);
 140         strbuf_release(&path);
 141         strbuf_release(&template_path);
 142         clear_repository_format(&template_format);
 143 }
 144
 145 /*
 146  * If the git_dir is not directly inside the working tree, then git will not
 147  * find it by default, and we need to set the worktree explicitly.
 148  */
 149 static int needs_work_tree_config(const char *git_dir, const char *work_tree)
 150 {
 151         if (!strcmp(work_tree, "/") && !strcmp(git_dir, "/.git"))
 152                 return 0;
 153         if (skip_prefix(git_dir, work_tree, &git_dir) &&
 154             !strcmp(git_dir, "/.git"))
 155                 return 0;
 156         return 1;
 157 }
 158
 159 void initialize_repository_version(int hash_algo, int reinit)
 160 {
 161         char repo_version_string[10];
 162         int repo_version = GIT_REPO_VERSION;
 163
 164         if (hash_algo != GIT_HASH_SHA1)
 165                 repo_version = GIT_REPO_VERSION_READ;
 166
 167         /* This forces creation of new config file */
 168         xsnprintf(repo_version_string, sizeof(repo_version_string),
 169                   "%d", repo_version);
 170         git_config_set("core.repositoryformatversion", repo_version_string);
 171
 172         if (hash_algo != GIT_HASH_SHA1)
 173                 git_config_set("extensions.objectformat",
 174                                hash_algos[hash_algo].name);
 175         else if (reinit)
 176                 git_config_set_gently("extensions.objectformat", NULL);
 177 }
 178
 179 static int create_default_files(const char *template_path,
 180                                 const char *original_git_dir,
 181                                 const char *initial_branch,
 182                                 const struct repository_format *fmt,
 183                                 int quiet)
 184 {
 185         struct stat st1;
 186         struct strbuf buf = STRBUF_INIT;
 187         char *path;
 188         char junk[2];
 189         int reinit;
 190         int filemode;
 191         struct strbuf err = STRBUF_INIT;
 192         const char *work_tree = get_git_work_tree();
 193
 194         /*
 195          * First copy the templates -- we might have the default
 196          * config file there, in which case we would want to read
 197          * from it after installing.
 198          *
 199          * Before reading that config, we also need to clear out any cached
 200          * values (since we've just potentially changed what's available on
 201          * disk).
 202          */
 203         copy_templates(template_path);
 204         git_config_clear();
 205         reset_shared_repository();
 206         git_config(git_default_config, NULL);
 207
 208         /*
 209          * We must make sure command-line options continue to override any
 210          * values we might have just re-read from the config.
 211          */
 212         is_bare_repository_cfg = init_is_bare_repository || !work_tree;
 213         if (init_shared_repository != -1)
 214                 set_shared_repository(init_shared_repository);
 215
 216         /*
 217          * We would have created the above under user's umask -- under
 218          * shared-repository settings, we would need to fix them up.
 219          */
 220         if (get_shared_repository()) {
 221                 adjust_shared_perm(get_git_dir());
 222         }
 223
 224         /*
 225          * We need to create a "refs" dir in any case so that older
 226          * versions of git can tell that this is a repository.
 227          */
 228         safe_create_dir(git_path("refs"), 1);
 229         adjust_shared_perm(git_path("refs"));
 230
 231         if (refs_init_db(&err))
 232                 die("failed to set up refs db: %s", err.buf);
 233
 234         /*
 235          * Point the HEAD symref to the initial branch with if HEAD does
 236          * not yet exist.
 237          */
 238         path = git_path_buf(&buf, "HEAD");
 239         reinit = (!access(path, R_OK)
 240                   || readlink(path, junk, sizeof(junk)-1) != -1);
 241         if (!reinit) {
 242                 char *ref;
 243
 244                 if (!initial_branch)
 245                         initial_branch = git_default_branch_name(quiet);
 246
 247                 ref = xstrfmt("refs/heads/%s", initial_branch);
 248                 if (check_refname_format(ref, 0) < 0)
 249                         die(_("invalid initial branch name: '%s'"),
 250                             initial_branch);
 251
 252                 if (create_symref("HEAD", ref, NULL) < 0)
 253                         exit(1);
 254                 free(ref);
 255         }
 256
 257         initialize_repository_version(fmt->hash_algo, 0);
 258
 259         /* Check filemode trustability */
 260         path = git_path_buf(&buf, "config");
 261         filemode = TEST_FILEMODE;
 262         if (TEST_FILEMODE && !lstat(path, &st1)) {
 263                 struct stat st2;
 264                 filemode = (!chmod(path, st1.st_mode ^ S_IXUSR) &&
 265                                 !lstat(path, &st2) &&
 266                                 st1.st_mode != st2.st_mode &&
 267                                 !chmod(path, st1.st_mode));
 268                 if (filemode && !reinit && (st1.st_mode & S_IXUSR))
 269                         filemode = 0;
 270         }
 271         git_config_set("core.filemode", filemode ? "true" : "false");
 272
 273         if (is_bare_repository())
 274                 git_config_set("core.bare", "true");
 275         else {
 276                 git_config_set("core.bare", "false");
 277                 /* allow template config file to override the default */
 278                 if (log_all_ref_updates == LOG_REFS_UNSET)
 279                         git_config_set("core.logallrefupdates", "true");
 280                 if (needs_work_tree_config(original_git_dir, work_tree))
 281                         git_config_set("core.worktree", work_tree);
 282         }
 283
 284         if (!reinit) {
 285                 /* Check if symlink is supported in the work tree */
 286                 path = git_path_buf(&buf, "tXXXXXX");
 287                 if (!close(xmkstemp(path)) &&
 288                     !unlink(path) &&
 289                     !symlink("testing", path) &&
 290                     !lstat(path, &st1) &&
 291                     S_ISLNK(st1.st_mode))
 292                         unlink(path); /* good */
 293                 else
 294                         git_config_set("core.symlinks", "false");
 295
 296                 /* Check if the filesystem is case-insensitive */
 297                 path = git_path_buf(&buf, "CoNfIg");
 298                 if (!access(path, F_OK))
 299                         git_config_set("core.ignorecase", "true");
 300                 probe_utf8_pathname_composition();
 301         }
 302
 303         strbuf_release(&buf);
 304         return reinit;
 305 }
 306
 307 static void create_object_directory(void)
 308 {
 309         struct strbuf path = STRBUF_INIT;
 310         size_t baselen;
 311
 312         strbuf_addstr(&path, get_object_directory());
 313         baselen = path.len;
 314
 315         safe_create_dir(path.buf, 1);
 316
 317         strbuf_setlen(&path, baselen);
 318         strbuf_addstr(&path, "/pack");
 319         safe_create_dir(path.buf, 1);
 320
 321         strbuf_setlen(&path, baselen);
 322         strbuf_addstr(&path, "/info");
 323         safe_create_dir(path.buf, 1);
 324
 325         strbuf_release(&path);
 326 }
 327
 328 static void separate_git_dir(const char *git_dir, const char *git_link)
 329 {
 330         struct stat st;
 331
 332         if (!stat(git_link, &st)) {
 333                 const char *src;
 334
 335                 if (S_ISREG(st.st_mode))
 336                         src = read_gitfile(git_link);
 337                 else if (S_ISDIR(st.st_mode))
 338                         src = git_link;
 339                 else
 340                         die(_("unable to handle file type %d"), (int)st.st_mode);
 341
 342                 if (rename(src, git_dir))
 343                         die_errno(_("unable to move %s to %s"), src, git_dir);
 344                 repair_worktrees(NULL, NULL);
 345         }
 346
 347         write_file(git_link, "gitdir: %s", git_dir);
 348 }
 349
 350 static void validate_hash_algorithm(struct repository_format *repo_fmt, int hash)
 351 {
 352         const char *env = getenv(GIT_DEFAULT_HASH_ENVIRONMENT);
 353         /*
 354          * If we already have an initialized repo, don't allow the user to
 355          * specify a different algorithm, as that could cause corruption.
 356          * Otherwise, if the user has specified one on the command line, use it.
 357          */
 358         if (repo_fmt->version >= 0 && hash != GIT_HASH_UNKNOWN && hash != repo_fmt->hash_algo)
 359                 die(_("attempt to reinitialize repository with different hash"));
 360         else if (hash != GIT_HASH_UNKNOWN)
 361                 repo_fmt->hash_algo = hash;
 362         else if (env) {
 363                 int env_algo = hash_algo_by_name(env);
 364                 if (env_algo == GIT_HASH_UNKNOWN)
 365                         die(_("unknown hash algorithm '%s'"), env);
 366                 repo_fmt->hash_algo = env_algo;
 367         }
 368 }
 369
 370 int init_db(const char *git_dir, const char *real_git_dir,
 371             const char *template_dir, int hash, const char *initial_branch,
 372             unsigned int flags)
 373 {
 374         int reinit;
 375         int exist_ok = flags & INIT_DB_EXIST_OK;
 376         char *original_git_dir = real_pathdup(git_dir, 1);
 377         struct repository_format repo_fmt = REPOSITORY_FORMAT_INIT;
 378
 379         if (real_git_dir) {
 380                 struct stat st;
 381
 382                 if (!exist_ok && !stat(git_dir, &st))
 383                         die(_("%s already exists"), git_dir);
 384
 385                 if (!exist_ok && !stat(real_git_dir, &st))
 386                         die(_("%s already exists"), real_git_dir);
 387
 388                 set_git_dir(real_git_dir, 1);
 389                 git_dir = get_git_dir();
 390                 separate_git_dir(git_dir, original_git_dir);
 391         }
 392         else {
 393                 set_git_dir(git_dir, 1);
 394                 git_dir = get_git_dir();
 395         }
 396         startup_info->have_repository = 1;
 397
 398         /* Ensure `core.hidedotfiles` is processed */
 399         git_config(platform_core_config, NULL);
 400
 401         safe_create_dir(git_dir, 0);
 402
 403         init_is_bare_repository = is_bare_repository();
 404
 405         /* Check to see if the repository version is right.
 406          * Note that a newly created repository does not have
 407          * config file, so this will not fail.  What we are catching
 408          * is an attempt to reinitialize new repository with an old tool.
 409          */
 410         check_repository_format(&repo_fmt);
 411
 412         validate_hash_algorithm(&repo_fmt, hash);
 413
 414         reinit = create_default_files(template_dir, original_git_dir,
 415                                       initial_branch, &repo_fmt,
 416                                       flags & INIT_DB_QUIET);
 417         if (reinit && initial_branch)
 418                 warning(_("re-init: ignored --initial-branch=%s"),
 419                         initial_branch);
 420
 421         create_object_directory();
 422
 423         if (get_shared_repository()) {
 424                 char buf[10];
 425                 /* We do not spell "group" and such, so that
 426                  * the configuration can be read by older version
 427                  * of git. Note, we use octal numbers for new share modes,
 428                  * and compatibility values for PERM_GROUP and
 429                  * PERM_EVERYBODY.
 430                  */
 431                 if (get_shared_repository() < 0)
 432                         /* force to the mode value */
 433                         xsnprintf(buf, sizeof(buf), "0%o", -get_shared_repository());
 434                 else if (get_shared_repository() == PERM_GROUP)
 435                         xsnprintf(buf, sizeof(buf), "%d", OLD_PERM_GROUP);
 436                 else if (get_shared_repository() == PERM_EVERYBODY)
 437                         xsnprintf(buf, sizeof(buf), "%d", OLD_PERM_EVERYBODY);
 438                 else
 439                         BUG("invalid value for shared_repository");
 440                 git_config_set("core.sharedrepository", buf);
 441                 git_config_set("receive.denyNonFastforwards", "true");
 442         }
 443
 444         if (!(flags & INIT_DB_QUIET)) {
 445                 int len = strlen(git_dir);
 446
 447                 if (reinit)
 448                         printf(get_shared_repository()
 449                                ? _("Reinitialized existing shared Git repository in %s%s\n")
 450                                : _("Reinitialized existing Git repository in %s%s\n"),
 451                                git_dir, len && git_dir[len-1] != '/' ? "/" : "");
 452                 else
 453                         printf(get_shared_repository()
 454                                ? _("Initialized empty shared Git repository in %s%s\n")
 455                                : _("Initialized empty Git repository in %s%s\n"),
 456                                git_dir, len && git_dir[len-1] != '/' ? "/" : "");
 457         }
 458
 459         free(original_git_dir);
 460         return 0;
 461 }
 462
 463 static int guess_repository_type(const char *git_dir)
 464 {
 465         const char *slash;
 466         char *cwd;
 467         int cwd_is_git_dir;
 468
 469         /*
 470          * "GIT_DIR=. git init" is always bare.
 471          * "GIT_DIR=`pwd` git init" too.
 472          */
 473         if (!strcmp(".", git_dir))
 474                 return 1;
 475         cwd = xgetcwd();
 476         cwd_is_git_dir = !strcmp(git_dir, cwd);
 477         free(cwd);
 478         if (cwd_is_git_dir)
 479                 return 1;
 480         /*
 481          * "GIT_DIR=.git or GIT_DIR=something/.git is usually not.
 482          */
 483         if (!strcmp(git_dir, ".git"))
 484                 return 0;
 485         slash = strrchr(git_dir, '/');
 486         if (slash && !strcmp(slash, "/.git"))
 487                 return 0;
 488
 489         /*
 490          * Otherwise it is often bare.  At this point
 491          * we are just guessing.
 492          */
 493         return 1;
 494 }
 495
 496 static int shared_callback(const struct option *opt, const char *arg, int unset)
 497 {
 498         BUG_ON_OPT_NEG(unset);
 499         *((int *) opt->value) = (arg) ? git_config_perm("arg", arg) : PERM_GROUP;
 500         return 0;
 501 }
 502
 503 static const char *const init_db_usage[] = {
 504         N_("git init [-q | --quiet] [--bare] [--template=<template-directory>]\n"
 505            "         [--separate-git-dir <git-dir>] [--object-format=<format>]\n"
 506            "         [-b <branch-name> | --initial-branch=<branch-name>]\n"
 507            "         [--shared[=<permissions>]] [<directory>]"),
 508         NULL
 509 };
 510
 511 /*
 512  * If you want to, you can share the DB area with any number of branches.
 513  * That has advantages: you can save space by sharing all the SHA1 objects.
 514  * On the other hand, it might just make lookup slower and messier. You
 515  * be the judge.  The default case is to have one DB per managed directory.
 516  */
 517 int cmd_init_db(int argc, const char **argv, const char *prefix)
 518 {
 519         const char *git_dir;
 520         const char *real_git_dir = NULL;
 521         const char *work_tree;
 522         const char *template_dir = NULL;
 523         unsigned int flags = 0;
 524         const char *object_format = NULL;
 525         const char *initial_branch = NULL;
 526         int hash_algo = GIT_HASH_UNKNOWN;
 527         const struct option init_db_options[] = {
 528                 OPT_STRING(0, "template", &template_dir, N_("template-directory"),
 529                                 N_("directory from which templates will be used")),
 530                 OPT_SET_INT(0, "bare", &is_bare_repository_cfg,
 531                                 N_("create a bare repository"), 1),
 532                 { OPTION_CALLBACK, 0, "shared", &init_shared_repository,
 533                         N_("permissions"),
 534                         N_("specify that the git repository is to be shared amongst several users"),
 535                         PARSE_OPT_OPTARG | PARSE_OPT_NONEG, shared_callback, 0},
 536                 OPT_BIT('q', "quiet", &flags, N_("be quiet"), INIT_DB_QUIET),
 537                 OPT_STRING(0, "separate-git-dir", &real_git_dir, N_("gitdir"),
 538                            N_("separate git dir from working tree")),
 539                 OPT_STRING('b', "initial-branch", &initial_branch, N_("name"),
 540                            N_("override the name of the initial branch")),
 541                 OPT_STRING(0, "object-format", &object_format, N_("hash"),
 542                            N_("specify the hash algorithm to use")),
 543                 OPT_END()
 544         };
 545
 546         argc = parse_options(argc, argv, prefix, init_db_options, init_db_usage, 0);
 547
 548         if (real_git_dir && is_bare_repository_cfg == 1)
 549                 die(_("options '%s' and '%s' cannot be used together"), "--separate-git-dir", "--bare");
 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                 UNLEAK(template_dir);
 557         }
 558
 559         if (argc == 1) {
 560                 int mkdir_tried = 0;
 561         retry:
 562                 if (chdir(argv[0]) < 0) {
 563                         if (!mkdir_tried) {
 564                                 int saved;
 565                                 /*
 566                                  * At this point we haven't read any configuration,
 567                                  * and we know shared_repository should always be 0;
 568                                  * but just in case we play safe.
 569                                  */
 570                                 saved = get_shared_repository();
 571                                 set_shared_repository(0);
 572                                 switch (safe_create_leading_directories_const(argv[0])) {
 573                                 case SCLD_OK:
 574                                 case SCLD_PERMS:
 575                                         break;
 576                                 case SCLD_EXISTS:
 577                                         errno = EEXIST;
 578                                         /* fallthru */
 579                                 default:
 580                                         die_errno(_("cannot mkdir %s"), argv[0]);
 581                                         break;
 582                                 }
 583                                 set_shared_repository(saved);
 584                                 if (mkdir(argv[0], 0777) < 0)
 585                                         die_errno(_("cannot mkdir %s"), argv[0]);
 586                                 mkdir_tried = 1;
 587                                 goto retry;
 588                         }
 589                         die_errno(_("cannot chdir to %s"), argv[0]);
 590                 }
 591         } else if (0 < argc) {
 592                 usage(init_db_usage[0]);
 593         }
 594         if (is_bare_repository_cfg == 1) {
 595                 char *cwd = xgetcwd();
 596                 setenv(GIT_DIR_ENVIRONMENT, cwd, argc > 0);
 597                 free(cwd);
 598         }
 599
 600         if (object_format) {
 601                 hash_algo = hash_algo_by_name(object_format);
 602                 if (hash_algo == GIT_HASH_UNKNOWN)
 603                         die(_("unknown hash algorithm '%s'"), object_format);
 604         }
 605
 606         if (init_shared_repository != -1)
 607                 set_shared_repository(init_shared_repository);
 608
 609         /*
 610          * GIT_WORK_TREE makes sense only in conjunction with GIT_DIR
 611          * without --bare.  Catch the error early.
 612          */
 613         git_dir = xstrdup_or_null(getenv(GIT_DIR_ENVIRONMENT));
 614         work_tree = xstrdup_or_null(getenv(GIT_WORK_TREE_ENVIRONMENT));
 615         if ((!git_dir || is_bare_repository_cfg == 1) && work_tree)
 616                 die(_("%s (or --work-tree=<directory>) not allowed without "
 617                           "specifying %s (or --git-dir=<directory>)"),
 618                     GIT_WORK_TREE_ENVIRONMENT,
 619                     GIT_DIR_ENVIRONMENT);
 620
 621         /*
 622          * Set up the default .git directory contents
 623          */
 624         if (!git_dir)
 625                 git_dir = DEFAULT_GIT_DIR_ENVIRONMENT;
 626
 627         /*
 628          * When --separate-git-dir is used inside a linked worktree, take
 629          * care to ensure that the common .git/ directory is relocated, not
 630          * the worktree-specific .git/worktrees/<id>/ directory.
 631          */
 632         if (real_git_dir) {
 633                 int err;
 634                 const char *p;
 635                 struct strbuf sb = STRBUF_INIT;
 636
 637                 p = read_gitfile_gently(git_dir, &err);
 638                 if (p && get_common_dir(&sb, p)) {
 639                         struct strbuf mainwt = STRBUF_INIT;
 640
 641                         strbuf_addbuf(&mainwt, &sb);
 642                         strbuf_strip_suffix(&mainwt, "/.git");
 643                         if (chdir(mainwt.buf) < 0)
 644                                 die_errno(_("cannot chdir to %s"), mainwt.buf);
 645                         strbuf_release(&mainwt);
 646                         git_dir = strbuf_detach(&sb, NULL);
 647                 }
 648                 strbuf_release(&sb);
 649         }
 650
 651         if (is_bare_repository_cfg < 0)
 652                 is_bare_repository_cfg = guess_repository_type(git_dir);
 653
 654         if (!is_bare_repository_cfg) {
 655                 const char *git_dir_parent = strrchr(git_dir, '/');
 656                 if (git_dir_parent) {
 657                         char *rel = xstrndup(git_dir, git_dir_parent - git_dir);
 658                         git_work_tree_cfg = real_pathdup(rel, 1);
 659                         free(rel);
 660                 }
 661                 if (!git_work_tree_cfg)
 662                         git_work_tree_cfg = xgetcwd();
 663                 if (work_tree)
 664                         set_git_work_tree(work_tree);
 665                 else
 666                         set_git_work_tree(git_work_tree_cfg);
 667                 if (access(get_git_work_tree(), X_OK))
 668                         die_errno (_("Cannot access work tree '%s'"),
 669                                    get_git_work_tree());
 670         }
 671         else {
 672                 if (real_git_dir)
 673                         die(_("--separate-git-dir incompatible with bare repository"));
 674                 if (work_tree)
 675                         set_git_work_tree(work_tree);
 676         }
 677
 678         UNLEAK(real_git_dir);
 679         UNLEAK(git_dir);
 680         UNLEAK(work_tree);
 681
 682         flags |= INIT_DB_EXIST_OK;
 683         return init_db(git_dir, real_git_dir, template_dir, hash_algo,
 684                        initial_branch, flags);
 685 }