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