setup.c

   1 #include "cache.h"
   2 #include "dir.h"
   3
   4 static int inside_git_dir = -1;
   5 static int inside_work_tree = -1;
   6
   7 char *prefix_path(const char *prefix, int len, const char *path)
   8 {
   9         const char *orig = path;
  10         char *sanitized;
  11         if (is_absolute_path(orig)) {
  12                 const char *temp = make_absolute_path(path);
  13                 sanitized = xmalloc(len + strlen(temp) + 1);
  14                 strcpy(sanitized, temp);
  15         } else {
  16                 sanitized = xmalloc(len + strlen(path) + 1);
  17                 if (len)
  18                         memcpy(sanitized, prefix, len);
  19                 strcpy(sanitized + len, path);
  20         }
  21         if (normalize_path_copy(sanitized, sanitized))
  22                 goto error_out;
  23         if (is_absolute_path(orig)) {
  24                 size_t root_len, len, total;
  25                 const char *work_tree = get_git_work_tree();
  26                 if (!work_tree)
  27                         goto error_out;
  28                 len = strlen(work_tree);
  29                 root_len = offset_1st_component(work_tree);
  30                 total = strlen(sanitized) + 1;
  31                 if (strncmp(sanitized, work_tree, len) ||
  32                     (len > root_len && sanitized[len] != '\0' && sanitized[len] != '/')) {
  33                 error_out:
  34                         die("'%s' is outside repository", orig);
  35                 }
  36                 if (sanitized[len] == '/')
  37                         len++;
  38                 memmove(sanitized, sanitized + len, total - len);
  39         }
  40         return sanitized;
  41 }
  42
  43 /*
  44  * Unlike prefix_path, this should be used if the named file does
  45  * not have to interact with index entry; i.e. name of a random file
  46  * on the filesystem.
  47  */
  48 const char *prefix_filename(const char *pfx, int pfx_len, const char *arg)
  49 {
  50         static char path[PATH_MAX];
  51 #ifndef WIN32
  52         if (!pfx_len || is_absolute_path(arg))
  53                 return arg;
  54         memcpy(path, pfx, pfx_len);
  55         strcpy(path + pfx_len, arg);
  56 #else
  57         char *p;
  58         /* don't add prefix to absolute paths, but still replace '\' by '/' */
  59         if (is_absolute_path(arg))
  60                 pfx_len = 0;
  61         else if (pfx_len)
  62                 memcpy(path, pfx, pfx_len);
  63         strcpy(path + pfx_len, arg);
  64         for (p = path + pfx_len; *p; p++)
  65                 if (*p == '\\')
  66                         *p = '/';
  67 #endif
  68         return path;
  69 }
  70
  71 int check_filename(const char *prefix, const char *arg)
  72 {
  73         const char *name;
  74         struct stat st;
  75
  76         name = prefix ? prefix_filename(prefix, strlen(prefix), arg) : arg;
  77         if (!lstat(name, &st))
  78                 return 1; /* file exists */
  79         if (errno == ENOENT || errno == ENOTDIR)
  80                 return 0; /* file does not exist */
  81         die_errno("failed to stat '%s'", arg);
  82 }
  83
  84 static void NORETURN die_verify_filename(const char *prefix, const char *arg)
  85 {
  86         unsigned char sha1[20];
  87         unsigned mode;
  88         /* try a detailed diagnostic ... */
  89         get_sha1_with_mode_1(arg, sha1, &mode, 0, prefix);
  90         /* ... or fall back the most general message. */
  91         die("ambiguous argument '%s': unknown revision or path not in the working tree.\n"
  92             "Use '--' to separate paths from revisions", arg);
  93
  94 }
  95
  96 /*
  97  * Verify a filename that we got as an argument for a pathspec
  98  * entry. Note that a filename that begins with "-" never verifies
  99  * as true, because even if such a filename were to exist, we want
 100  * it to be preceded by the "--" marker (or we want the user to
 101  * use a format like "./-filename")
 102  */
 103 void verify_filename(const char *prefix, const char *arg)
 104 {
 105         if (*arg == '-')
 106                 die("bad flag '%s' used after filename", arg);
 107         if (check_filename(prefix, arg))
 108                 return;
 109         die_verify_filename(prefix, arg);
 110 }
 111
 112 /*
 113  * Opposite of the above: the command line did not have -- marker
 114  * and we parsed the arg as a refname.  It should not be interpretable
 115  * as a filename.
 116  */
 117 void verify_non_filename(const char *prefix, const char *arg)
 118 {
 119         if (!is_inside_work_tree() || is_inside_git_dir())
 120                 return;
 121         if (*arg == '-')
 122                 return; /* flag */
 123         if (!check_filename(prefix, arg))
 124                 return;
 125         die("ambiguous argument '%s': both revision and filename\n"
 126             "Use '--' to separate filenames from revisions", arg);
 127 }
 128
 129 const char **get_pathspec(const char *prefix, const char **pathspec)
 130 {
 131         const char *entry = *pathspec;
 132         const char **src, **dst;
 133         int prefixlen;
 134
 135         if (!prefix && !entry)
 136                 return NULL;
 137
 138         if (!entry) {
 139                 static const char *spec[2];
 140                 spec[0] = prefix;
 141                 spec[1] = NULL;
 142                 return spec;
 143         }
 144
 145         /* Otherwise we have to re-write the entries.. */
 146         src = pathspec;
 147         dst = pathspec;
 148         prefixlen = prefix ? strlen(prefix) : 0;
 149         while (*src) {
 150                 const char *p = prefix_path(prefix, prefixlen, *src);
 151                 *(dst++) = p;
 152                 src++;
 153         }
 154         *dst = NULL;
 155         if (!*pathspec)
 156                 return NULL;
 157         return pathspec;
 158 }
 159
 160 /*
 161  * Test if it looks like we're at a git directory.
 162  * We want to see:
 163  *
 164  *  - either an objects/ directory _or_ the proper
 165  *    GIT_OBJECT_DIRECTORY environment variable
 166  *  - a refs/ directory
 167  *  - either a HEAD symlink or a HEAD file that is formatted as
 168  *    a proper "ref:", or a regular file HEAD that has a properly
 169  *    formatted sha1 object name.
 170  */
 171 static int is_git_directory(const char *suspect)
 172 {
 173         char path[PATH_MAX];
 174         size_t len = strlen(suspect);
 175
 176         if (PATH_MAX <= len + strlen("/objects"))
 177                 die("Too long path: %.*s", 60, suspect);
 178         strcpy(path, suspect);
 179         if (getenv(DB_ENVIRONMENT)) {
 180                 if (access(getenv(DB_ENVIRONMENT), X_OK))
 181                         return 0;
 182         }
 183         else {
 184                 strcpy(path + len, "/objects");
 185                 if (access(path, X_OK))
 186                         return 0;
 187         }
 188
 189         strcpy(path + len, "/refs");
 190         if (access(path, X_OK))
 191                 return 0;
 192
 193         strcpy(path + len, "/HEAD");
 194         if (validate_headref(path))
 195                 return 0;
 196
 197         return 1;
 198 }
 199
 200 int is_inside_git_dir(void)
 201 {
 202         if (inside_git_dir < 0)
 203                 inside_git_dir = is_inside_dir(get_git_dir());
 204         return inside_git_dir;
 205 }
 206
 207 int is_inside_work_tree(void)
 208 {
 209         if (inside_work_tree < 0)
 210                 inside_work_tree = is_inside_dir(get_git_work_tree());
 211         return inside_work_tree;
 212 }
 213
 214 void setup_work_tree(void)
 215 {
 216         const char *work_tree, *git_dir;
 217         static int initialized = 0;
 218
 219         if (initialized)
 220                 return;
 221         work_tree = get_git_work_tree();
 222         git_dir = get_git_dir();
 223         if (!is_absolute_path(git_dir))
 224                 git_dir = make_absolute_path(git_dir);
 225         if (!work_tree || chdir(work_tree))
 226                 die("This operation must be run in a work tree");
 227
 228         /*
 229          * Make sure subsequent git processes find correct worktree
 230          * if $GIT_WORK_TREE is set relative
 231          */
 232         if (getenv(GIT_WORK_TREE_ENVIRONMENT))
 233                 setenv(GIT_WORK_TREE_ENVIRONMENT, ".", 1);
 234
 235         set_git_dir(make_relative_path(git_dir, work_tree));
 236         initialized = 1;
 237 }
 238
 239 static int check_repository_format_gently(const char *gitdir, int *nongit_ok)
 240 {
 241         char repo_config[PATH_MAX+1];
 242
 243         /*
 244          * git_config() can't be used here because it calls git_pathdup()
 245          * to get $GIT_CONFIG/config. That call will make setup_git_env()
 246          * set git_dir to ".git".
 247          *
 248          * We are in gitdir setup, no git dir has been found useable yet.
 249          * Use a gentler version of git_config() to check if this repo
 250          * is a good one.
 251          */
 252         snprintf(repo_config, PATH_MAX, "%s/config", gitdir);
 253         git_config_early(check_repository_format_version, NULL, repo_config);
 254         if (GIT_REPO_VERSION < repository_format_version) {
 255                 if (!nongit_ok)
 256                         die ("Expected git repo version <= %d, found %d",
 257                              GIT_REPO_VERSION, repository_format_version);
 258                 warning("Expected git repo version <= %d, found %d",
 259                         GIT_REPO_VERSION, repository_format_version);
 260                 warning("Please upgrade Git");
 261                 *nongit_ok = -1;
 262                 return -1;
 263         }
 264         return 0;
 265 }
 266
 267 /*
 268  * Try to read the location of the git directory from the .git file,
 269  * return path to git directory if found.
 270  */
 271 const char *read_gitfile_gently(const char *path)
 272 {
 273         char *buf;
 274         char *dir;
 275         const char *slash;
 276         struct stat st;
 277         int fd;
 278         size_t len;
 279
 280         if (stat(path, &st))
 281                 return NULL;
 282         if (!S_ISREG(st.st_mode))
 283                 return NULL;
 284         fd = open(path, O_RDONLY);
 285         if (fd < 0)
 286                 die_errno("Error opening '%s'", path);
 287         buf = xmalloc(st.st_size + 1);
 288         len = read_in_full(fd, buf, st.st_size);
 289         close(fd);
 290         if (len != st.st_size)
 291                 die("Error reading %s", path);
 292         buf[len] = '\0';
 293         if (prefixcmp(buf, "gitdir: "))
 294                 die("Invalid gitfile format: %s", path);
 295         while (buf[len - 1] == '\n' || buf[len - 1] == '\r')
 296                 len--;
 297         if (len < 9)
 298                 die("No path in gitfile: %s", path);
 299         buf[len] = '\0';
 300         dir = buf + 8;
 301
 302         if (!is_absolute_path(dir) && (slash = strrchr(path, '/'))) {
 303                 size_t pathlen = slash+1 - path;
 304                 size_t dirlen = pathlen + len - 8;
 305                 dir = xmalloc(dirlen + 1);
 306                 strncpy(dir, path, pathlen);
 307                 strncpy(dir + pathlen, buf + 8, len - 8);
 308                 dir[dirlen] = '\0';
 309                 free(buf);
 310                 buf = dir;
 311         }
 312
 313         if (!is_git_directory(dir))
 314                 die("Not a git repository: %s", dir);
 315         path = make_absolute_path(dir);
 316
 317         free(buf);
 318         return path;
 319 }
 320
 321 static const char *setup_explicit_git_dir(const char *gitdirenv,
 322                                           char *cwd, int len,
 323                                           int *nongit_ok)
 324 {
 325         const char *work_tree_env = getenv(GIT_WORK_TREE_ENVIRONMENT);
 326         const char *worktree;
 327         char *gitfile;
 328
 329         if (PATH_MAX - 40 < strlen(gitdirenv))
 330                 die("'$%s' too big", GIT_DIR_ENVIRONMENT);
 331
 332         gitfile = (char*)read_gitfile_gently(gitdirenv);
 333         if (gitfile) {
 334                 gitfile = xstrdup(gitfile);
 335                 gitdirenv = gitfile;
 336         }
 337
 338         if (!is_git_directory(gitdirenv)) {
 339                 if (nongit_ok) {
 340                         *nongit_ok = 1;
 341                         free(gitfile);
 342                         return NULL;
 343                 }
 344                 die("Not a git repository: '%s'", gitdirenv);
 345         }
 346
 347         if (check_repository_format_gently(gitdirenv, nongit_ok)) {
 348                 free(gitfile);
 349                 return NULL;
 350         }
 351
 352         /* #3, #7, #11, #15, #19, #23, #27, #31 (see t1510) */
 353         if (work_tree_env)
 354                 set_git_work_tree(work_tree_env);
 355         else if (is_bare_repository_cfg > 0) {
 356                 if (git_work_tree_cfg) /* #22.2, #30 */
 357                         die("core.bare and core.worktree do not make sense");
 358
 359                 /* #18, #26 */
 360                 set_git_dir(gitdirenv);
 361                 free(gitfile);
 362                 return NULL;
 363         }
 364         else if (git_work_tree_cfg) { /* #6, #14 */
 365                 if (is_absolute_path(git_work_tree_cfg))
 366                         set_git_work_tree(git_work_tree_cfg);
 367                 else {
 368                         char core_worktree[PATH_MAX];
 369                         if (chdir(gitdirenv))
 370                                 die_errno("Could not chdir to '%s'", gitdirenv);
 371                         if (chdir(git_work_tree_cfg))
 372                                 die_errno("Could not chdir to '%s'", git_work_tree_cfg);
 373                         if (!getcwd(core_worktree, PATH_MAX))
 374                                 die_errno("Could not get directory '%s'", git_work_tree_cfg);
 375                         if (chdir(cwd))
 376                                 die_errno("Could not come back to cwd");
 377                         set_git_work_tree(core_worktree);
 378                 }
 379         }
 380         else /* #2, #10 */
 381                 set_git_work_tree(".");
 382
 383         /* set_git_work_tree() must have been called by now */
 384         worktree = get_git_work_tree();
 385
 386         /* both get_git_work_tree() and cwd are already normalized */
 387         if (!strcmp(cwd, worktree)) { /* cwd == worktree */
 388                 set_git_dir(gitdirenv);
 389                 free(gitfile);
 390                 return NULL;
 391         }
 392
 393         if (!prefixcmp(cwd, worktree) &&
 394             cwd[strlen(worktree)] == '/') { /* cwd inside worktree */
 395                 set_git_dir(make_absolute_path(gitdirenv));
 396                 if (chdir(worktree))
 397                         die_errno("Could not chdir to '%s'", worktree);
 398                 cwd[len++] = '/';
 399                 cwd[len] = '\0';
 400                 free(gitfile);
 401                 return cwd + strlen(worktree) + 1;
 402         }
 403
 404         /* cwd outside worktree */
 405         set_git_dir(gitdirenv);
 406         free(gitfile);
 407         return NULL;
 408 }
 409
 410 static const char *setup_discovered_git_dir(const char *gitdir,
 411                                             char *cwd, int offset, int len,
 412                                             int *nongit_ok)
 413 {
 414         if (check_repository_format_gently(gitdir, nongit_ok))
 415                 return NULL;
 416
 417         /* --work-tree is set without --git-dir; use discovered one */
 418         if (getenv(GIT_WORK_TREE_ENVIRONMENT) || git_work_tree_cfg) {
 419                 if (offset != len && !is_absolute_path(gitdir))
 420                         gitdir = xstrdup(make_absolute_path(gitdir));
 421                 if (chdir(cwd))
 422                         die_errno("Could not come back to cwd");
 423                 return setup_explicit_git_dir(gitdir, cwd, len, nongit_ok);
 424         }
 425
 426         /* #16.2, #17.2, #20.2, #21.2, #24, #25, #28, #29 (see t1510) */
 427         if (is_bare_repository_cfg > 0) {
 428                 set_git_dir(offset == len ? gitdir : make_absolute_path(gitdir));
 429                 if (chdir(cwd))
 430                         die_errno("Could not come back to cwd");
 431                 return NULL;
 432         }
 433
 434         /* #0, #1, #5, #8, #9, #12, #13 */
 435         set_git_work_tree(".");
 436         if (strcmp(gitdir, DEFAULT_GIT_DIR_ENVIRONMENT))
 437                 set_git_dir(gitdir);
 438         inside_git_dir = 0;
 439         inside_work_tree = 1;
 440         if (offset == len)
 441                 return NULL;
 442
 443         /* Make "offset" point to past the '/', and add a '/' at the end */
 444         offset++;
 445         cwd[len++] = '/';
 446         cwd[len] = 0;
 447         return cwd + offset;
 448 }
 449
 450 /* #16.1, #17.1, #20.1, #21.1, #22.1 (see t1510) */
 451 static const char *setup_bare_git_dir(char *cwd, int offset, int len, int *nongit_ok)
 452 {
 453         int root_len;
 454
 455         if (check_repository_format_gently(".", nongit_ok))
 456                 return NULL;
 457
 458         /* --work-tree is set without --git-dir; use discovered one */
 459         if (getenv(GIT_WORK_TREE_ENVIRONMENT) || git_work_tree_cfg) {
 460                 const char *gitdir;
 461
 462                 gitdir = offset == len ? "." : xmemdupz(cwd, offset);
 463                 if (chdir(cwd))
 464                         die_errno("Could not come back to cwd");
 465                 return setup_explicit_git_dir(gitdir, cwd, len, nongit_ok);
 466         }
 467
 468         inside_git_dir = 1;
 469         inside_work_tree = 0;
 470         if (offset != len) {
 471                 if (chdir(cwd))
 472                         die_errno("Cannot come back to cwd");
 473                 root_len = offset_1st_component(cwd);
 474                 cwd[offset > root_len ? offset : root_len] = '\0';
 475                 set_git_dir(cwd);
 476         }
 477         else
 478                 set_git_dir(".");
 479         return NULL;
 480 }
 481
 482 static const char *setup_nongit(const char *cwd, int *nongit_ok)
 483 {
 484         if (!nongit_ok)
 485                 die("Not a git repository (or any of the parent directories): %s", DEFAULT_GIT_DIR_ENVIRONMENT);
 486         if (chdir(cwd))
 487                 die_errno("Cannot come back to cwd");
 488         *nongit_ok = 1;
 489         return NULL;
 490 }
 491
 492 static dev_t get_device_or_die(const char *path, const char *prefix)
 493 {
 494         struct stat buf;
 495         if (stat(path, &buf))
 496                 die_errno("failed to stat '%s%s%s'",
 497                                 prefix ? prefix : "",
 498                                 prefix ? "/" : "", path);
 499         return buf.st_dev;
 500 }
 501
 502 /*
 503  * We cannot decide in this function whether we are in the work tree or
 504  * not, since the config can only be read _after_ this function was called.
 505  */
 506 static const char *setup_git_directory_gently_1(int *nongit_ok)
 507 {
 508         const char *env_ceiling_dirs = getenv(CEILING_DIRECTORIES_ENVIRONMENT);
 509         static char cwd[PATH_MAX+1];
 510         const char *gitdirenv, *ret;
 511         char *gitfile;
 512         int len, offset, ceil_offset;
 513         dev_t current_device = 0;
 514         int one_filesystem = 1;
 515
 516         /*
 517          * Let's assume that we are in a git repository.
 518          * If it turns out later that we are somewhere else, the value will be
 519          * updated accordingly.
 520          */
 521         if (nongit_ok)
 522                 *nongit_ok = 0;
 523
 524         if (!getcwd(cwd, sizeof(cwd)-1))
 525                 die_errno("Unable to read current working directory");
 526         offset = len = strlen(cwd);
 527
 528         /*
 529          * If GIT_DIR is set explicitly, we're not going
 530          * to do any discovery, but we still do repository
 531          * validation.
 532          */
 533         gitdirenv = getenv(GIT_DIR_ENVIRONMENT);
 534         if (gitdirenv)
 535                 return setup_explicit_git_dir(gitdirenv, cwd, len, nongit_ok);
 536
 537         ceil_offset = longest_ancestor_length(cwd, env_ceiling_dirs);
 538         if (ceil_offset < 0 && has_dos_drive_prefix(cwd))
 539                 ceil_offset = 1;
 540
 541         /*
 542          * Test in the following order (relative to the cwd):
 543          * - .git (file containing "gitdir: <path>")
 544          * - .git/
 545          * - ./ (bare)
 546          * - ../.git
 547          * - ../.git/
 548          * - ../ (bare)
 549          * - ../../.git/
 550          *   etc.
 551          */
 552         one_filesystem = !git_env_bool("GIT_DISCOVERY_ACROSS_FILESYSTEM", 0);
 553         if (one_filesystem)
 554                 current_device = get_device_or_die(".", NULL);
 555         for (;;) {
 556                 gitfile = (char*)read_gitfile_gently(DEFAULT_GIT_DIR_ENVIRONMENT);
 557                 if (gitfile)
 558                         gitdirenv = gitfile = xstrdup(gitfile);
 559                 else {
 560                         if (is_git_directory(DEFAULT_GIT_DIR_ENVIRONMENT))
 561                                 gitdirenv = DEFAULT_GIT_DIR_ENVIRONMENT;
 562                 }
 563
 564                 if (gitdirenv) {
 565                         ret = setup_discovered_git_dir(gitdirenv,
 566                                                        cwd, offset, len,
 567                                                        nongit_ok);
 568                         free(gitfile);
 569                         return ret;
 570                 }
 571                 free(gitfile);
 572
 573                 if (is_git_directory("."))
 574                         return setup_bare_git_dir(cwd, offset, len, nongit_ok);
 575
 576                 while (--offset > ceil_offset && cwd[offset] != '/');
 577                 if (offset <= ceil_offset)
 578                         return setup_nongit(cwd, nongit_ok);
 579                 if (one_filesystem) {
 580                         dev_t parent_device = get_device_or_die("..", cwd);
 581                         if (parent_device != current_device) {
 582                                 if (nongit_ok) {
 583                                         if (chdir(cwd))
 584                                                 die_errno("Cannot come back to cwd");
 585                                         *nongit_ok = 1;
 586                                         return NULL;
 587                                 }
 588                                 cwd[offset] = '\0';
 589                                 die("Not a git repository (or any parent up to mount parent %s)\n"
 590                                 "Stopping at filesystem boundary (GIT_DISCOVERY_ACROSS_FILESYSTEM not set).", cwd);
 591                         }
 592                 }
 593                 if (chdir("..")) {
 594                         cwd[offset] = '\0';
 595                         die_errno("Cannot change to '%s/..'", cwd);
 596                 }
 597         }
 598 }
 599
 600 const char *setup_git_directory_gently(int *nongit_ok)
 601 {
 602         const char *prefix;
 603
 604         prefix = setup_git_directory_gently_1(nongit_ok);
 605         if (startup_info) {
 606                 startup_info->have_repository = !nongit_ok || !*nongit_ok;
 607                 startup_info->prefix = prefix;
 608         }
 609         return prefix;
 610 }
 611
 612 int git_config_perm(const char *var, const char *value)
 613 {
 614         int i;
 615         char *endptr;
 616
 617         if (value == NULL)
 618                 return PERM_GROUP;
 619
 620         if (!strcmp(value, "umask"))
 621                 return PERM_UMASK;
 622         if (!strcmp(value, "group"))
 623                 return PERM_GROUP;
 624         if (!strcmp(value, "all") ||
 625             !strcmp(value, "world") ||
 626             !strcmp(value, "everybody"))
 627                 return PERM_EVERYBODY;
 628
 629         /* Parse octal numbers */
 630         i = strtol(value, &endptr, 8);
 631
 632         /* If not an octal number, maybe true/false? */
 633         if (*endptr != 0)
 634                 return git_config_bool(var, value) ? PERM_GROUP : PERM_UMASK;
 635
 636         /*
 637          * Treat values 0, 1 and 2 as compatibility cases, otherwise it is
 638          * a chmod value to restrict to.
 639          */
 640         switch (i) {
 641         case PERM_UMASK:               /* 0 */
 642                 return PERM_UMASK;
 643         case OLD_PERM_GROUP:           /* 1 */
 644                 return PERM_GROUP;
 645         case OLD_PERM_EVERYBODY:       /* 2 */
 646                 return PERM_EVERYBODY;
 647         }
 648
 649         /* A filemode value was given: 0xxx */
 650
 651         if ((i & 0600) != 0600)
 652                 die("Problem with core.sharedRepository filemode value "
 653                     "(0%.3o).\nThe owner of files must always have "
 654                     "read and write permissions.", i);
 655
 656         /*
 657          * Mask filemode value. Others can not get write permission.
 658          * x flags for directories are handled separately.
 659          */
 660         return -(i & 0666);
 661 }
 662
 663 int check_repository_format_version(const char *var, const char *value, void *cb)
 664 {
 665         if (strcmp(var, "core.repositoryformatversion") == 0)
 666                 repository_format_version = git_config_int(var, value);
 667         else if (strcmp(var, "core.sharedrepository") == 0)
 668                 shared_repository = git_config_perm(var, value);
 669         else if (strcmp(var, "core.bare") == 0) {
 670                 is_bare_repository_cfg = git_config_bool(var, value);
 671                 if (is_bare_repository_cfg == 1)
 672                         inside_work_tree = -1;
 673         } else if (strcmp(var, "core.worktree") == 0) {
 674                 if (!value)
 675                         return config_error_nonbool(var);
 676                 free(git_work_tree_cfg);
 677                 git_work_tree_cfg = xstrdup(value);
 678                 inside_work_tree = -1;
 679         }
 680         return 0;
 681 }
 682
 683 int check_repository_format(void)
 684 {
 685         return check_repository_format_gently(get_git_dir(), NULL);
 686 }
 687
 688 /*
 689  * Returns the "prefix", a path to the current working directory
 690  * relative to the work tree root, or NULL, if the current working
 691  * directory is not a strict subdirectory of the work tree root. The
 692  * prefix always ends with a '/' character.
 693  */
 694 const char *setup_git_directory(void)
 695 {
 696         return setup_git_directory_gently(NULL);
 697 }