setup.con commit t0001: test git init when run via an alias (4ad8332)
   1#include "cache.h"
   2#include "dir.h"
   3
   4static int inside_git_dir = -1;
   5static int inside_work_tree = -1;
   6
   7const 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 */
  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 || !*pfx || 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
  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        set_git_dir(make_relative_path(git_dir, work_tree));
 225        initialized = 1;
 226}
 227
 228static int check_repository_format_gently(const char *gitdir, int *nongit_ok)
 229{
 230        char repo_config[PATH_MAX+1];
 231
 232        /*
 233         * git_config() can't be used here because it calls git_pathdup()
 234         * to get $GIT_CONFIG/config. That call will make setup_git_env()
 235         * set git_dir to ".git".
 236         *
 237         * We are in gitdir setup, no git dir has been found useable yet.
 238         * Use a gentler version of git_config() to check if this repo
 239         * is a good one.
 240         */
 241        snprintf(repo_config, PATH_MAX, "%s/config", gitdir);
 242        git_config_early(check_repository_format_version, NULL, repo_config);
 243        if (GIT_REPO_VERSION < repository_format_version) {
 244                if (!nongit_ok)
 245                        die ("Expected git repo version <= %d, found %d",
 246                             GIT_REPO_VERSION, repository_format_version);
 247                warning("Expected git repo version <= %d, found %d",
 248                        GIT_REPO_VERSION, repository_format_version);
 249                warning("Please upgrade Git");
 250                *nongit_ok = -1;
 251                return -1;
 252        }
 253        return 0;
 254}
 255
 256/*
 257 * Try to read the location of the git directory from the .git file,
 258 * return path to git directory if found.
 259 */
 260const char *read_gitfile_gently(const char *path)
 261{
 262        char *buf;
 263        char *dir;
 264        const char *slash;
 265        struct stat st;
 266        int fd;
 267        size_t len;
 268
 269        if (stat(path, &st))
 270                return NULL;
 271        if (!S_ISREG(st.st_mode))
 272                return NULL;
 273        fd = open(path, O_RDONLY);
 274        if (fd < 0)
 275                die_errno("Error opening '%s'", path);
 276        buf = xmalloc(st.st_size + 1);
 277        len = read_in_full(fd, buf, st.st_size);
 278        close(fd);
 279        if (len != st.st_size)
 280                die("Error reading %s", path);
 281        buf[len] = '\0';
 282        if (prefixcmp(buf, "gitdir: "))
 283                die("Invalid gitfile format: %s", path);
 284        while (buf[len - 1] == '\n' || buf[len - 1] == '\r')
 285                len--;
 286        if (len < 9)
 287                die("No path in gitfile: %s", path);
 288        buf[len] = '\0';
 289        dir = buf + 8;
 290
 291        if (!is_absolute_path(dir) && (slash = strrchr(path, '/'))) {
 292                size_t pathlen = slash+1 - path;
 293                size_t dirlen = pathlen + len - 8;
 294                dir = xmalloc(dirlen + 1);
 295                strncpy(dir, path, pathlen);
 296                strncpy(dir + pathlen, buf + 8, len - 8);
 297                dir[dirlen] = '\0';
 298                free(buf);
 299                buf = dir;
 300        }
 301
 302        if (!is_git_directory(dir))
 303                die("Not a git repository: %s", dir);
 304        path = make_absolute_path(dir);
 305
 306        free(buf);
 307        return path;
 308}
 309
 310static const char *setup_explicit_git_dir(const char *gitdirenv,
 311                                          char *cwd, int len,
 312                                          int *nongit_ok)
 313{
 314        const char *work_tree_env = getenv(GIT_WORK_TREE_ENVIRONMENT);
 315        const char *worktree;
 316        char *gitfile;
 317
 318        if (PATH_MAX - 40 < strlen(gitdirenv))
 319                die("'$%s' too big", GIT_DIR_ENVIRONMENT);
 320
 321        gitfile = (char*)read_gitfile_gently(gitdirenv);
 322        if (gitfile) {
 323                gitfile = xstrdup(gitfile);
 324                gitdirenv = gitfile;
 325        }
 326
 327        if (!is_git_directory(gitdirenv)) {
 328                if (nongit_ok) {
 329                        *nongit_ok = 1;
 330                        free(gitfile);
 331                        return NULL;
 332                }
 333                die("Not a git repository: '%s'", gitdirenv);
 334        }
 335
 336        if (check_repository_format_gently(gitdirenv, nongit_ok)) {
 337                free(gitfile);
 338                return NULL;
 339        }
 340
 341        /* #3, #7, #11, #15, #19, #23, #27, #31 (see t1510) */
 342        if (work_tree_env)
 343                set_git_work_tree(work_tree_env);
 344        else if (is_bare_repository_cfg > 0) {
 345                if (git_work_tree_cfg) /* #22.2, #30 */
 346                        die("core.bare and core.worktree do not make sense");
 347
 348                /* #18, #26 */
 349                set_git_dir(gitdirenv);
 350                free(gitfile);
 351                return NULL;
 352        }
 353        else if (git_work_tree_cfg) { /* #6, #14 */
 354                if (is_absolute_path(git_work_tree_cfg))
 355                        set_git_work_tree(git_work_tree_cfg);
 356                else {
 357                        char core_worktree[PATH_MAX];
 358                        if (chdir(gitdirenv))
 359                                die_errno("Could not chdir to '%s'", gitdirenv);
 360                        if (chdir(git_work_tree_cfg))
 361                                die_errno("Could not chdir to '%s'", git_work_tree_cfg);
 362                        if (!getcwd(core_worktree, PATH_MAX))
 363                                die_errno("Could not get directory '%s'", git_work_tree_cfg);
 364                        if (chdir(cwd))
 365                                die_errno("Could not come back to cwd");
 366                        set_git_work_tree(core_worktree);
 367                }
 368        }
 369        else /* #2, #10 */
 370                set_git_work_tree(".");
 371
 372        /* set_git_work_tree() must have been called by now */
 373        worktree = get_git_work_tree();
 374
 375        /* both get_git_work_tree() and cwd are already normalized */
 376        if (!strcmp(cwd, worktree)) { /* cwd == worktree */
 377                set_git_dir(gitdirenv);
 378                free(gitfile);
 379                return NULL;
 380        }
 381
 382        if (!prefixcmp(cwd, worktree) &&
 383            cwd[strlen(worktree)] == '/') { /* cwd inside worktree */
 384                set_git_dir(make_absolute_path(gitdirenv));
 385                if (chdir(worktree))
 386                        die_errno("Could not chdir to '%s'", worktree);
 387                cwd[len++] = '/';
 388                cwd[len] = '\0';
 389                free(gitfile);
 390                return cwd + strlen(worktree) + 1;
 391        }
 392
 393        /* cwd outside worktree */
 394        set_git_dir(gitdirenv);
 395        free(gitfile);
 396        return NULL;
 397}
 398
 399static const char *setup_discovered_git_dir(const char *gitdir,
 400                                            char *cwd, int offset, int len,
 401                                            int *nongit_ok)
 402{
 403        if (check_repository_format_gently(gitdir, nongit_ok))
 404                return NULL;
 405
 406        /* #16.2, #17.2, #20.2, #21.2, #24, #25, #28, #29 (see t1510) */
 407        if (is_bare_repository_cfg > 0) {
 408                set_git_dir(offset == len ? gitdir : make_absolute_path(gitdir));
 409                if (chdir(cwd))
 410                        die_errno("Could not come back to cwd");
 411                return NULL;
 412        }
 413
 414        /* #0, #1, #5, #8, #9, #12, #13 */
 415        set_git_work_tree(".");
 416        if (strcmp(gitdir, DEFAULT_GIT_DIR_ENVIRONMENT))
 417                set_git_dir(gitdir);
 418        inside_git_dir = 0;
 419        inside_work_tree = 1;
 420        if (offset == len)
 421                return NULL;
 422
 423        /* Make "offset" point to past the '/', and add a '/' at the end */
 424        offset++;
 425        cwd[len++] = '/';
 426        cwd[len] = 0;
 427        return cwd + offset;
 428}
 429
 430/* #16.1, #17.1, #20.1, #21.1, #22.1 (see t1510) */
 431static const char *setup_bare_git_dir(char *cwd, int offset, int len, int *nongit_ok)
 432{
 433        int root_len;
 434
 435        if (check_repository_format_gently(".", nongit_ok))
 436                return NULL;
 437
 438        inside_git_dir = 1;
 439        inside_work_tree = 0;
 440        if (offset != len) {
 441                if (chdir(cwd))
 442                        die_errno("Cannot come back to cwd");
 443                root_len = offset_1st_component(cwd);
 444                cwd[offset > root_len ? offset : root_len] = '\0';
 445                set_git_dir(cwd);
 446        }
 447        else
 448                set_git_dir(".");
 449        return NULL;
 450}
 451
 452static const char *setup_nongit(const char *cwd, int *nongit_ok)
 453{
 454        if (!nongit_ok)
 455                die("Not a git repository (or any of the parent directories): %s", DEFAULT_GIT_DIR_ENVIRONMENT);
 456        if (chdir(cwd))
 457                die_errno("Cannot come back to cwd");
 458        *nongit_ok = 1;
 459        return NULL;
 460}
 461
 462static dev_t get_device_or_die(const char *path, const char *prefix)
 463{
 464        struct stat buf;
 465        if (stat(path, &buf))
 466                die_errno("failed to stat '%s%s%s'",
 467                                prefix ? prefix : "",
 468                                prefix ? "/" : "", path);
 469        return buf.st_dev;
 470}
 471
 472/*
 473 * We cannot decide in this function whether we are in the work tree or
 474 * not, since the config can only be read _after_ this function was called.
 475 */
 476static const char *setup_git_directory_gently_1(int *nongit_ok)
 477{
 478        const char *env_ceiling_dirs = getenv(CEILING_DIRECTORIES_ENVIRONMENT);
 479        static char cwd[PATH_MAX+1];
 480        const char *gitdirenv, *ret;
 481        char *gitfile;
 482        int len, offset, ceil_offset;
 483        dev_t current_device = 0;
 484        int one_filesystem = 1;
 485
 486        /*
 487         * Let's assume that we are in a git repository.
 488         * If it turns out later that we are somewhere else, the value will be
 489         * updated accordingly.
 490         */
 491        if (nongit_ok)
 492                *nongit_ok = 0;
 493
 494        if (!getcwd(cwd, sizeof(cwd)-1))
 495                die_errno("Unable to read current working directory");
 496        offset = len = strlen(cwd);
 497
 498        /*
 499         * If GIT_DIR is set explicitly, we're not going
 500         * to do any discovery, but we still do repository
 501         * validation.
 502         */
 503        gitdirenv = getenv(GIT_DIR_ENVIRONMENT);
 504        if (gitdirenv)
 505                return setup_explicit_git_dir(gitdirenv, cwd, len, nongit_ok);
 506
 507        ceil_offset = longest_ancestor_length(cwd, env_ceiling_dirs);
 508        if (ceil_offset < 0 && has_dos_drive_prefix(cwd))
 509                ceil_offset = 1;
 510
 511        /*
 512         * Test in the following order (relative to the cwd):
 513         * - .git (file containing "gitdir: <path>")
 514         * - .git/
 515         * - ./ (bare)
 516         * - ../.git
 517         * - ../.git/
 518         * - ../ (bare)
 519         * - ../../.git/
 520         *   etc.
 521         */
 522        one_filesystem = !git_env_bool("GIT_DISCOVERY_ACROSS_FILESYSTEM", 0);
 523        if (one_filesystem)
 524                current_device = get_device_or_die(".", NULL);
 525        for (;;) {
 526                gitfile = (char*)read_gitfile_gently(DEFAULT_GIT_DIR_ENVIRONMENT);
 527                if (gitfile)
 528                        gitdirenv = gitfile = xstrdup(gitfile);
 529                else {
 530                        if (is_git_directory(DEFAULT_GIT_DIR_ENVIRONMENT))
 531                                gitdirenv = DEFAULT_GIT_DIR_ENVIRONMENT;
 532                }
 533
 534                if (gitdirenv) {
 535                        ret = setup_discovered_git_dir(gitdirenv,
 536                                                       cwd, offset, len,
 537                                                       nongit_ok);
 538                        free(gitfile);
 539                        return ret;
 540                }
 541                free(gitfile);
 542
 543                if (is_git_directory("."))
 544                        return setup_bare_git_dir(cwd, offset, len, nongit_ok);
 545
 546                while (--offset > ceil_offset && cwd[offset] != '/');
 547                if (offset <= ceil_offset)
 548                        return setup_nongit(cwd, nongit_ok);
 549                if (one_filesystem) {
 550                        dev_t parent_device = get_device_or_die("..", cwd);
 551                        if (parent_device != current_device) {
 552                                if (nongit_ok) {
 553                                        if (chdir(cwd))
 554                                                die_errno("Cannot come back to cwd");
 555                                        *nongit_ok = 1;
 556                                        return NULL;
 557                                }
 558                                cwd[offset] = '\0';
 559                                die("Not a git repository (or any parent up to mount parent %s)\n"
 560                                "Stopping at filesystem boundary (GIT_DISCOVERY_ACROSS_FILESYSTEM not set).", cwd);
 561                        }
 562                }
 563                if (chdir("..")) {
 564                        cwd[offset] = '\0';
 565                        die_errno("Cannot change to '%s/..'", cwd);
 566                }
 567        }
 568}
 569
 570const char *setup_git_directory_gently(int *nongit_ok)
 571{
 572        const char *prefix;
 573
 574        prefix = setup_git_directory_gently_1(nongit_ok);
 575        if (startup_info)
 576                startup_info->have_repository = !nongit_ok || !*nongit_ok;
 577        return prefix;
 578}
 579
 580int git_config_perm(const char *var, const char *value)
 581{
 582        int i;
 583        char *endptr;
 584
 585        if (value == NULL)
 586                return PERM_GROUP;
 587
 588        if (!strcmp(value, "umask"))
 589                return PERM_UMASK;
 590        if (!strcmp(value, "group"))
 591                return PERM_GROUP;
 592        if (!strcmp(value, "all") ||
 593            !strcmp(value, "world") ||
 594            !strcmp(value, "everybody"))
 595                return PERM_EVERYBODY;
 596
 597        /* Parse octal numbers */
 598        i = strtol(value, &endptr, 8);
 599
 600        /* If not an octal number, maybe true/false? */
 601        if (*endptr != 0)
 602                return git_config_bool(var, value) ? PERM_GROUP : PERM_UMASK;
 603
 604        /*
 605         * Treat values 0, 1 and 2 as compatibility cases, otherwise it is
 606         * a chmod value to restrict to.
 607         */
 608        switch (i) {
 609        case PERM_UMASK:               /* 0 */
 610                return PERM_UMASK;
 611        case OLD_PERM_GROUP:           /* 1 */
 612                return PERM_GROUP;
 613        case OLD_PERM_EVERYBODY:       /* 2 */
 614                return PERM_EVERYBODY;
 615        }
 616
 617        /* A filemode value was given: 0xxx */
 618
 619        if ((i & 0600) != 0600)
 620                die("Problem with core.sharedRepository filemode value "
 621                    "(0%.3o).\nThe owner of files must always have "
 622                    "read and write permissions.", i);
 623
 624        /*
 625         * Mask filemode value. Others can not get write permission.
 626         * x flags for directories are handled separately.
 627         */
 628        return -(i & 0666);
 629}
 630
 631int check_repository_format_version(const char *var, const char *value, void *cb)
 632{
 633        if (strcmp(var, "core.repositoryformatversion") == 0)
 634                repository_format_version = git_config_int(var, value);
 635        else if (strcmp(var, "core.sharedrepository") == 0)
 636                shared_repository = git_config_perm(var, value);
 637        else if (strcmp(var, "core.bare") == 0) {
 638                is_bare_repository_cfg = git_config_bool(var, value);
 639                if (is_bare_repository_cfg == 1)
 640                        inside_work_tree = -1;
 641        } else if (strcmp(var, "core.worktree") == 0) {
 642                if (!value)
 643                        return config_error_nonbool(var);
 644                free(git_work_tree_cfg);
 645                git_work_tree_cfg = xstrdup(value);
 646                inside_work_tree = -1;
 647        }
 648        return 0;
 649}
 650
 651int check_repository_format(void)
 652{
 653        return check_repository_format_gently(get_git_dir(), NULL);
 654}
 655
 656/*
 657 * Returns the "prefix", a path to the current working directory
 658 * relative to the work tree root, or NULL, if the current working
 659 * directory is not a strict subdirectory of the work tree root. The
 660 * prefix always ends with a '/' character.
 661 */
 662const char *setup_git_directory(void)
 663{
 664        return setup_git_directory_gently(NULL);
 665}