Andrew's git / gitweb.git / setup.c
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setup.con commit Kill off get_relative_cwd() (b892913)
   1#include "cache.h"
   2#include "dir.h"
   3
   4static int inside_git_dir = -1;
   5static int inside_work_tree = -1;
   6
   7char *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 */
  45const 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
  68int 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
  81static 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 */
 100void 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 */
 114void 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
 126const 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 */
 168static 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
 197int 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
 204int 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
 211void 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
 236static 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 */
 268const 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
 318static 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
 408static 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) */
 449static 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
 480static 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
 490static 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 */
 504static 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
 598const 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
 610int 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
 661int 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
 681int 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 */
 692const char *setup_git_directory(void)
 693{
 694        return setup_git_directory_gently(NULL);
 695}