Andrew's git - gitweb.git/blob

   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;
  11        if (is_absolute_path(orig)) {
  12                const char *temp = real_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 */
  48const 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
  71int 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
  84static void NORETURN die_verify_filename(const char *prefix, const char *arg)
  85{
  86        unsigned char sha1[20];
  87        unsigned mode;
  88
  89        /*
  90         * Saying "'(icase)foo' does not exist in the index" when the
  91         * user gave us ":(icase)foo" is just stupid.  A magic pathspec
  92         * begins with a colon and is followed by a non-alnum; do not
  93         * let get_sha1_with_mode_1(only_to_die=1) to even trigger.
  94         */
  95        if (!(arg[0] == ':' && !isalnum(arg[1])))
  96                /* try a detailed diagnostic ... */
  97                get_sha1_with_mode_1(arg, sha1, &mode, 1, prefix);
  98
  99        /* ... or fall back the most general message. */
 100        die("ambiguous argument '%s': unknown revision or path not in the working tree.\n"
 101            "Use '--' to separate paths from revisions", arg);
 102
 103}
 104
 105/*
 106 * Verify a filename that we got as an argument for a pathspec
 107 * entry. Note that a filename that begins with "-" never verifies
 108 * as true, because even if such a filename were to exist, we want
 109 * it to be preceded by the "--" marker (or we want the user to
 110 * use a format like "./-filename")
 111 */
 112void verify_filename(const char *prefix, const char *arg)
 113{
 114        if (*arg == '-')
 115                die("bad flag '%s' used after filename", arg);
 116        if (check_filename(prefix, arg))
 117                return;
 118        die_verify_filename(prefix, arg);
 119}
 120
 121/*
 122 * Opposite of the above: the command line did not have -- marker
 123 * and we parsed the arg as a refname.  It should not be interpretable
 124 * as a filename.
 125 */
 126void verify_non_filename(const char *prefix, const char *arg)
 127{
 128        if (!is_inside_work_tree() || is_inside_git_dir())
 129                return;
 130        if (*arg == '-')
 131                return; /* flag */
 132        if (!check_filename(prefix, arg))
 133                return;
 134        die("ambiguous argument '%s': both revision and filename\n"
 135            "Use '--' to separate filenames from revisions", arg);
 136}
 137
 138/*
 139 * Magic pathspec
 140 *
 141 * NEEDSWORK: These need to be moved to dir.h or even to a new
 142 * pathspec.h when we restructure get_pathspec() users to use the
 143 * "struct pathspec" interface.
 144 *
 145 * Possible future magic semantics include stuff like:
 146 *
 147 *      { PATHSPEC_NOGLOB, '!', "noglob" },
 148 *      { PATHSPEC_ICASE, '\0', "icase" },
 149 *      { PATHSPEC_RECURSIVE, '*', "recursive" },
 150 *      { PATHSPEC_REGEXP, '\0', "regexp" },
 151 *
 152 */
 153#define PATHSPEC_FROMTOP    (1<<0)
 154
 155static struct pathspec_magic {
 156        unsigned bit;
 157        char mnemonic; /* this cannot be ':'! */
 158        const char *name;
 159} pathspec_magic[] = {
 160        { PATHSPEC_FROMTOP, '/', "top" },
 161};
 162
 163/*
 164 * Take an element of a pathspec and check for magic signatures.
 165 * Append the result to the prefix.
 166 *
 167 * For now, we only parse the syntax and throw out anything other than
 168 * "top" magic.
 169 *
 170 * NEEDSWORK: This needs to be rewritten when we start migrating
 171 * get_pathspec() users to use the "struct pathspec" interface.  For
 172 * example, a pathspec element may be marked as case-insensitive, but
 173 * the prefix part must always match literally, and a single stupid
 174 * string cannot express such a case.
 175 */
 176static const char *prefix_pathspec(const char *prefix, int prefixlen, const char *elt)
 177{
 178        unsigned magic = 0;
 179        const char *copyfrom = elt;
 180        int i;
 181
 182        if (elt[0] != ':') {
 183                ; /* nothing to do */
 184        } else if (elt[1] == '(') {
 185                /* longhand */
 186                const char *nextat;
 187                for (copyfrom = elt + 2;
 188                     *copyfrom && *copyfrom != ')';
 189                     copyfrom = nextat) {
 190                        size_t len = strcspn(copyfrom, ",)");
 191                        if (copyfrom[len] == ')')
 192                                nextat = copyfrom + len;
 193                        else
 194                                nextat = copyfrom + len + 1;
 195                        if (!len)
 196                                continue;
 197                        for (i = 0; i < ARRAY_SIZE(pathspec_magic); i++)
 198                                if (strlen(pathspec_magic[i].name) == len &&
 199                                    !strncmp(pathspec_magic[i].name, copyfrom, len)) {
 200                                        magic |= pathspec_magic[i].bit;
 201                                        break;
 202                                }
 203                        if (ARRAY_SIZE(pathspec_magic) <= i)
 204                                die("Invalid pathspec magic '%.*s' in '%s'",
 205                                    (int) len, copyfrom, elt);
 206                }
 207                if (*copyfrom == ')')
 208                        copyfrom++;
 209        } else {
 210                /* shorthand */
 211                for (copyfrom = elt + 1;
 212                     *copyfrom && *copyfrom != ':';
 213                     copyfrom++) {
 214                        char ch = *copyfrom;
 215
 216                        if (!is_pathspec_magic(ch))
 217                                break;
 218                        for (i = 0; i < ARRAY_SIZE(pathspec_magic); i++)
 219                                if (pathspec_magic[i].mnemonic == ch) {
 220                                        magic |= pathspec_magic[i].bit;
 221                                        break;
 222                                }
 223                        if (ARRAY_SIZE(pathspec_magic) <= i)
 224                                die("Unimplemented pathspec magic '%c' in '%s'",
 225                                    ch, elt);
 226                }
 227                if (*copyfrom == ':')
 228                        copyfrom++;
 229        }
 230
 231        if (magic & PATHSPEC_FROMTOP)
 232                return xstrdup(copyfrom);
 233        else
 234                return prefix_path(prefix, prefixlen, copyfrom);
 235}
 236
 237const char **get_pathspec(const char *prefix, const char **pathspec)
 238{
 239        const char *entry = *pathspec;
 240        const char **src, **dst;
 241        int prefixlen;
 242
 243        if (!prefix && !entry)
 244                return NULL;
 245
 246        if (!entry) {
 247                static const char *spec[2];
 248                spec[0] = prefix;
 249                spec[1] = NULL;
 250                return spec;
 251        }
 252
 253        /* Otherwise we have to re-write the entries.. */
 254        src = pathspec;
 255        dst = pathspec;
 256        prefixlen = prefix ? strlen(prefix) : 0;
 257        while (*src) {
 258                *(dst++) = prefix_pathspec(prefix, prefixlen, *src);
 259                src++;
 260        }
 261        *dst = NULL;
 262        if (!*pathspec)
 263                return NULL;
 264        return pathspec;
 265}
 266
 267/*
 268 * Test if it looks like we're at a git directory.
 269 * We want to see:
 270 *
 271 *  - either an objects/ directory _or_ the proper
 272 *    GIT_OBJECT_DIRECTORY environment variable
 273 *  - a refs/ directory
 274 *  - either a HEAD symlink or a HEAD file that is formatted as
 275 *    a proper "ref:", or a regular file HEAD that has a properly
 276 *    formatted sha1 object name.
 277 */
 278static int is_git_directory(const char *suspect)
 279{
 280        char path[PATH_MAX];
 281        size_t len = strlen(suspect);
 282
 283        if (PATH_MAX <= len + strlen("/objects"))
 284                die("Too long path: %.*s", 60, suspect);
 285        strcpy(path, suspect);
 286        if (getenv(DB_ENVIRONMENT)) {
 287                if (access(getenv(DB_ENVIRONMENT), X_OK))
 288                        return 0;
 289        }
 290        else {
 291                strcpy(path + len, "/objects");
 292                if (access(path, X_OK))
 293                        return 0;
 294        }
 295
 296        strcpy(path + len, "/refs");
 297        if (access(path, X_OK))
 298                return 0;
 299
 300        strcpy(path + len, "/HEAD");
 301        if (validate_headref(path))
 302                return 0;
 303
 304        return 1;
 305}
 306
 307int is_inside_git_dir(void)
 308{
 309        if (inside_git_dir < 0)
 310                inside_git_dir = is_inside_dir(get_git_dir());
 311        return inside_git_dir;
 312}
 313
 314int is_inside_work_tree(void)
 315{
 316        if (inside_work_tree < 0)
 317                inside_work_tree = is_inside_dir(get_git_work_tree());
 318        return inside_work_tree;
 319}
 320
 321void setup_work_tree(void)
 322{
 323        const char *work_tree, *git_dir;
 324        static int initialized = 0;
 325
 326        if (initialized)
 327                return;
 328        work_tree = get_git_work_tree();
 329        git_dir = get_git_dir();
 330        if (!is_absolute_path(git_dir))
 331                git_dir = real_path(get_git_dir());
 332        if (!work_tree || chdir(work_tree))
 333                die("This operation must be run in a work tree");
 334
 335        /*
 336         * Make sure subsequent git processes find correct worktree
 337         * if $GIT_WORK_TREE is set relative
 338         */
 339        if (getenv(GIT_WORK_TREE_ENVIRONMENT))
 340                setenv(GIT_WORK_TREE_ENVIRONMENT, ".", 1);
 341
 342        set_git_dir(relative_path(git_dir, work_tree));
 343        initialized = 1;
 344}
 345
 346static int check_repository_format_gently(const char *gitdir, int *nongit_ok)
 347{
 348        char repo_config[PATH_MAX+1];
 349
 350        /*
 351         * git_config() can't be used here because it calls git_pathdup()
 352         * to get $GIT_CONFIG/config. That call will make setup_git_env()
 353         * set git_dir to ".git".
 354         *
 355         * We are in gitdir setup, no git dir has been found useable yet.
 356         * Use a gentler version of git_config() to check if this repo
 357         * is a good one.
 358         */
 359        snprintf(repo_config, PATH_MAX, "%s/config", gitdir);
 360        git_config_early(check_repository_format_version, NULL, repo_config);
 361        if (GIT_REPO_VERSION < repository_format_version) {
 362                if (!nongit_ok)
 363                        die ("Expected git repo version <= %d, found %d",
 364                             GIT_REPO_VERSION, repository_format_version);
 365                warning("Expected git repo version <= %d, found %d",
 366                        GIT_REPO_VERSION, repository_format_version);
 367                warning("Please upgrade Git");
 368                *nongit_ok = -1;
 369                return -1;
 370        }
 371        return 0;
 372}
 373
 374/*
 375 * Try to read the location of the git directory from the .git file,
 376 * return path to git directory if found.
 377 */
 378const char *read_gitfile_gently(const char *path)
 379{
 380        char *buf;
 381        char *dir;
 382        const char *slash;
 383        struct stat st;
 384        int fd;
 385        size_t len;
 386
 387        if (stat(path, &st))
 388                return NULL;
 389        if (!S_ISREG(st.st_mode))
 390                return NULL;
 391        fd = open(path, O_RDONLY);
 392        if (fd < 0)
 393                die_errno("Error opening '%s'", path);
 394        buf = xmalloc(st.st_size + 1);
 395        len = read_in_full(fd, buf, st.st_size);
 396        close(fd);
 397        if (len != st.st_size)
 398                die("Error reading %s", path);
 399        buf[len] = '\0';
 400        if (prefixcmp(buf, "gitdir: "))
 401                die("Invalid gitfile format: %s", path);
 402        while (buf[len - 1] == '\n' || buf[len - 1] == '\r')
 403                len--;
 404        if (len < 9)
 405                die("No path in gitfile: %s", path);
 406        buf[len] = '\0';
 407        dir = buf + 8;
 408
 409        if (!is_absolute_path(dir) && (slash = strrchr(path, '/'))) {
 410                size_t pathlen = slash+1 - path;
 411                size_t dirlen = pathlen + len - 8;
 412                dir = xmalloc(dirlen + 1);
 413                strncpy(dir, path, pathlen);
 414                strncpy(dir + pathlen, buf + 8, len - 8);
 415                dir[dirlen] = '\0';
 416                free(buf);
 417                buf = dir;
 418        }
 419
 420        if (!is_git_directory(dir))
 421                die("Not a git repository: %s", dir);
 422        path = real_path(dir);
 423
 424        free(buf);
 425        return path;
 426}
 427
 428static const char *setup_explicit_git_dir(const char *gitdirenv,
 429                                          char *cwd, int len,
 430                                          int *nongit_ok)
 431{
 432        const char *work_tree_env = getenv(GIT_WORK_TREE_ENVIRONMENT);
 433        const char *worktree;
 434        char *gitfile;
 435
 436        if (PATH_MAX - 40 < strlen(gitdirenv))
 437                die("'$%s' too big", GIT_DIR_ENVIRONMENT);
 438
 439        gitfile = (char*)read_gitfile_gently(gitdirenv);
 440        if (gitfile) {
 441                gitfile = xstrdup(gitfile);
 442                gitdirenv = gitfile;
 443        }
 444
 445        if (!is_git_directory(gitdirenv)) {
 446                if (nongit_ok) {
 447                        *nongit_ok = 1;
 448                        free(gitfile);
 449                        return NULL;
 450                }
 451                die("Not a git repository: '%s'", gitdirenv);
 452        }
 453
 454        if (check_repository_format_gently(gitdirenv, nongit_ok)) {
 455                free(gitfile);
 456                return NULL;
 457        }
 458
 459        /* #3, #7, #11, #15, #19, #23, #27, #31 (see t1510) */
 460        if (work_tree_env)
 461                set_git_work_tree(work_tree_env);
 462        else if (is_bare_repository_cfg > 0) {
 463                if (git_work_tree_cfg) /* #22.2, #30 */
 464                        die("core.bare and core.worktree do not make sense");
 465
 466                /* #18, #26 */
 467                set_git_dir(gitdirenv);
 468                free(gitfile);
 469                return NULL;
 470        }
 471        else if (git_work_tree_cfg) { /* #6, #14 */
 472                if (is_absolute_path(git_work_tree_cfg))
 473                        set_git_work_tree(git_work_tree_cfg);
 474                else {
 475                        char core_worktree[PATH_MAX];
 476                        if (chdir(gitdirenv))
 477                                die_errno("Could not chdir to '%s'", gitdirenv);
 478                        if (chdir(git_work_tree_cfg))
 479                                die_errno("Could not chdir to '%s'", git_work_tree_cfg);
 480                        if (!getcwd(core_worktree, PATH_MAX))
 481                                die_errno("Could not get directory '%s'", git_work_tree_cfg);
 482                        if (chdir(cwd))
 483                                die_errno("Could not come back to cwd");
 484                        set_git_work_tree(core_worktree);
 485                }
 486        }
 487        else /* #2, #10 */
 488                set_git_work_tree(".");
 489
 490        /* set_git_work_tree() must have been called by now */
 491        worktree = get_git_work_tree();
 492
 493        /* both get_git_work_tree() and cwd are already normalized */
 494        if (!strcmp(cwd, worktree)) { /* cwd == worktree */
 495                set_git_dir(gitdirenv);
 496                free(gitfile);
 497                return NULL;
 498        }
 499
 500        if (!prefixcmp(cwd, worktree) &&
 501            cwd[strlen(worktree)] == '/') { /* cwd inside worktree */
 502                set_git_dir(real_path(gitdirenv));
 503                if (chdir(worktree))
 504                        die_errno("Could not chdir to '%s'", worktree);
 505                cwd[len++] = '/';
 506                cwd[len] = '\0';
 507                free(gitfile);
 508                return cwd + strlen(worktree) + 1;
 509        }
 510
 511        /* cwd outside worktree */
 512        set_git_dir(gitdirenv);
 513        free(gitfile);
 514        return NULL;
 515}
 516
 517static const char *setup_discovered_git_dir(const char *gitdir,
 518                                            char *cwd, int offset, int len,
 519                                            int *nongit_ok)
 520{
 521        if (check_repository_format_gently(gitdir, nongit_ok))
 522                return NULL;
 523
 524        /* --work-tree is set without --git-dir; use discovered one */
 525        if (getenv(GIT_WORK_TREE_ENVIRONMENT) || git_work_tree_cfg) {
 526                if (offset != len && !is_absolute_path(gitdir))
 527                        gitdir = xstrdup(real_path(gitdir));
 528                if (chdir(cwd))
 529                        die_errno("Could not come back to cwd");
 530                return setup_explicit_git_dir(gitdir, cwd, len, nongit_ok);
 531        }
 532
 533        /* #16.2, #17.2, #20.2, #21.2, #24, #25, #28, #29 (see t1510) */
 534        if (is_bare_repository_cfg > 0) {
 535                set_git_dir(offset == len ? gitdir : real_path(gitdir));
 536                if (chdir(cwd))
 537                        die_errno("Could not come back to cwd");
 538                return NULL;
 539        }
 540
 541        /* #0, #1, #5, #8, #9, #12, #13 */
 542        set_git_work_tree(".");
 543        if (strcmp(gitdir, DEFAULT_GIT_DIR_ENVIRONMENT))
 544                set_git_dir(gitdir);
 545        inside_git_dir = 0;
 546        inside_work_tree = 1;
 547        if (offset == len)
 548                return NULL;
 549
 550        /* Make "offset" point to past the '/', and add a '/' at the end */
 551        offset++;
 552        cwd[len++] = '/';
 553        cwd[len] = 0;
 554        return cwd + offset;
 555}
 556
 557/* #16.1, #17.1, #20.1, #21.1, #22.1 (see t1510) */
 558static const char *setup_bare_git_dir(char *cwd, int offset, int len, int *nongit_ok)
 559{
 560        int root_len;
 561
 562        if (check_repository_format_gently(".", nongit_ok))
 563                return NULL;
 564
 565        /* --work-tree is set without --git-dir; use discovered one */
 566        if (getenv(GIT_WORK_TREE_ENVIRONMENT) || git_work_tree_cfg) {
 567                const char *gitdir;
 568
 569                gitdir = offset == len ? "." : xmemdupz(cwd, offset);
 570                if (chdir(cwd))
 571                        die_errno("Could not come back to cwd");
 572                return setup_explicit_git_dir(gitdir, cwd, len, nongit_ok);
 573        }
 574
 575        inside_git_dir = 1;
 576        inside_work_tree = 0;
 577        if (offset != len) {
 578                if (chdir(cwd))
 579                        die_errno("Cannot come back to cwd");
 580                root_len = offset_1st_component(cwd);
 581                cwd[offset > root_len ? offset : root_len] = '\0';
 582                set_git_dir(cwd);
 583        }
 584        else
 585                set_git_dir(".");
 586        return NULL;
 587}
 588
 589static const char *setup_nongit(const char *cwd, int *nongit_ok)
 590{
 591        if (!nongit_ok)
 592                die("Not a git repository (or any of the parent directories): %s", DEFAULT_GIT_DIR_ENVIRONMENT);
 593        if (chdir(cwd))
 594                die_errno("Cannot come back to cwd");
 595        *nongit_ok = 1;
 596        return NULL;
 597}
 598
 599static dev_t get_device_or_die(const char *path, const char *prefix)
 600{
 601        struct stat buf;
 602        if (stat(path, &buf))
 603                die_errno("failed to stat '%s%s%s'",
 604                                prefix ? prefix : "",
 605                                prefix ? "/" : "", path);
 606        return buf.st_dev;
 607}
 608
 609/*
 610 * We cannot decide in this function whether we are in the work tree or
 611 * not, since the config can only be read _after_ this function was called.
 612 */
 613static const char *setup_git_directory_gently_1(int *nongit_ok)
 614{
 615        const char *env_ceiling_dirs = getenv(CEILING_DIRECTORIES_ENVIRONMENT);
 616        static char cwd[PATH_MAX+1];
 617        const char *gitdirenv, *ret;
 618        char *gitfile;
 619        int len, offset, ceil_offset;
 620        dev_t current_device = 0;
 621        int one_filesystem = 1;
 622
 623        /*
 624         * Let's assume that we are in a git repository.
 625         * If it turns out later that we are somewhere else, the value will be
 626         * updated accordingly.
 627         */
 628        if (nongit_ok)
 629                *nongit_ok = 0;
 630
 631        if (!getcwd(cwd, sizeof(cwd)-1))
 632                die_errno("Unable to read current working directory");
 633        offset = len = strlen(cwd);
 634
 635        /*
 636         * If GIT_DIR is set explicitly, we're not going
 637         * to do any discovery, but we still do repository
 638         * validation.
 639         */
 640        gitdirenv = getenv(GIT_DIR_ENVIRONMENT);
 641        if (gitdirenv)
 642                return setup_explicit_git_dir(gitdirenv, cwd, len, nongit_ok);
 643
 644        ceil_offset = longest_ancestor_length(cwd, env_ceiling_dirs);
 645        if (ceil_offset < 0 && has_dos_drive_prefix(cwd))
 646                ceil_offset = 1;
 647
 648        /*
 649         * Test in the following order (relative to the cwd):
 650         * - .git (file containing "gitdir: <path>")
 651         * - .git/
 652         * - ./ (bare)
 653         * - ../.git
 654         * - ../.git/
 655         * - ../ (bare)
 656         * - ../../.git/
 657         *   etc.
 658         */
 659        one_filesystem = !git_env_bool("GIT_DISCOVERY_ACROSS_FILESYSTEM", 0);
 660        if (one_filesystem)
 661                current_device = get_device_or_die(".", NULL);
 662        for (;;) {
 663                gitfile = (char*)read_gitfile_gently(DEFAULT_GIT_DIR_ENVIRONMENT);
 664                if (gitfile)
 665                        gitdirenv = gitfile = xstrdup(gitfile);
 666                else {
 667                        if (is_git_directory(DEFAULT_GIT_DIR_ENVIRONMENT))
 668                                gitdirenv = DEFAULT_GIT_DIR_ENVIRONMENT;
 669                }
 670
 671                if (gitdirenv) {
 672                        ret = setup_discovered_git_dir(gitdirenv,
 673                                                       cwd, offset, len,
 674                                                       nongit_ok);
 675                        free(gitfile);
 676                        return ret;
 677                }
 678                free(gitfile);
 679
 680                if (is_git_directory("."))
 681                        return setup_bare_git_dir(cwd, offset, len, nongit_ok);
 682
 683                while (--offset > ceil_offset && cwd[offset] != '/');
 684                if (offset <= ceil_offset)
 685                        return setup_nongit(cwd, nongit_ok);
 686                if (one_filesystem) {
 687                        dev_t parent_device = get_device_or_die("..", cwd);
 688                        if (parent_device != current_device) {
 689                                if (nongit_ok) {
 690                                        if (chdir(cwd))
 691                                                die_errno("Cannot come back to cwd");
 692                                        *nongit_ok = 1;
 693                                        return NULL;
 694                                }
 695                                cwd[offset] = '\0';
 696                                die("Not a git repository (or any parent up to mount parent %s)\n"
 697                                "Stopping at filesystem boundary (GIT_DISCOVERY_ACROSS_FILESYSTEM not set).", cwd);
 698                        }
 699                }
 700                if (chdir("..")) {
 701                        cwd[offset] = '\0';
 702                        die_errno("Cannot change to '%s/..'", cwd);
 703                }
 704        }
 705}
 706
 707const char *setup_git_directory_gently(int *nongit_ok)
 708{
 709        const char *prefix;
 710
 711        prefix = setup_git_directory_gently_1(nongit_ok);
 712        if (startup_info) {
 713                startup_info->have_repository = !nongit_ok || !*nongit_ok;
 714                startup_info->prefix = prefix;
 715        }
 716        return prefix;
 717}
 718
 719int git_config_perm(const char *var, const char *value)
 720{
 721        int i;
 722        char *endptr;
 723
 724        if (value == NULL)
 725                return PERM_GROUP;
 726
 727        if (!strcmp(value, "umask"))
 728                return PERM_UMASK;
 729        if (!strcmp(value, "group"))
 730                return PERM_GROUP;
 731        if (!strcmp(value, "all") ||
 732            !strcmp(value, "world") ||
 733            !strcmp(value, "everybody"))
 734                return PERM_EVERYBODY;
 735
 736        /* Parse octal numbers */
 737        i = strtol(value, &endptr, 8);
 738
 739        /* If not an octal number, maybe true/false? */
 740        if (*endptr != 0)
 741                return git_config_bool(var, value) ? PERM_GROUP : PERM_UMASK;
 742
 743        /*
 744         * Treat values 0, 1 and 2 as compatibility cases, otherwise it is
 745         * a chmod value to restrict to.
 746         */
 747        switch (i) {
 748        case PERM_UMASK:               /* 0 */
 749                return PERM_UMASK;
 750        case OLD_PERM_GROUP:           /* 1 */
 751                return PERM_GROUP;
 752        case OLD_PERM_EVERYBODY:       /* 2 */
 753                return PERM_EVERYBODY;
 754        }
 755
 756        /* A filemode value was given: 0xxx */
 757
 758        if ((i & 0600) != 0600)
 759                die("Problem with core.sharedRepository filemode value "
 760                    "(0%.3o).\nThe owner of files must always have "
 761                    "read and write permissions.", i);
 762
 763        /*
 764         * Mask filemode value. Others can not get write permission.
 765         * x flags for directories are handled separately.
 766         */
 767        return -(i & 0666);
 768}
 769
 770int check_repository_format_version(const char *var, const char *value, void *cb)
 771{
 772        if (strcmp(var, "core.repositoryformatversion") == 0)
 773                repository_format_version = git_config_int(var, value);
 774        else if (strcmp(var, "core.sharedrepository") == 0)
 775                shared_repository = git_config_perm(var, value);
 776        else if (strcmp(var, "core.bare") == 0) {
 777                is_bare_repository_cfg = git_config_bool(var, value);
 778                if (is_bare_repository_cfg == 1)
 779                        inside_work_tree = -1;
 780        } else if (strcmp(var, "core.worktree") == 0) {
 781                if (!value)
 782                        return config_error_nonbool(var);
 783                free(git_work_tree_cfg);
 784                git_work_tree_cfg = xstrdup(value);
 785                inside_work_tree = -1;
 786        }
 787        return 0;
 788}
 789
 790int check_repository_format(void)
 791{
 792        return check_repository_format_gently(get_git_dir(), NULL);
 793}
 794
 795/*
 796 * Returns the "prefix", a path to the current working directory
 797 * relative to the work tree root, or NULL, if the current working
 798 * directory is not a strict subdirectory of the work tree root. The
 799 * prefix always ends with a '/' character.
 800 */
 801const char *setup_git_directory(void)
 802{
 803        return setup_git_directory_gently(NULL);
 804}