Andrew's git / gitweb.git / setup.c
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setup.con commit git svn: avoid uninitialized var in 'reset' (70ee0b7)
   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        strcpy(path, suspect);
 174        if (getenv(DB_ENVIRONMENT)) {
 175                if (access(getenv(DB_ENVIRONMENT), X_OK))
 176                        return 0;
 177        }
 178        else {
 179                strcpy(path + len, "/objects");
 180                if (access(path, X_OK))
 181                        return 0;
 182        }
 183
 184        strcpy(path + len, "/refs");
 185        if (access(path, X_OK))
 186                return 0;
 187
 188        strcpy(path + len, "/HEAD");
 189        if (validate_headref(path))
 190                return 0;
 191
 192        return 1;
 193}
 194
 195int is_inside_git_dir(void)
 196{
 197        if (inside_git_dir < 0)
 198                inside_git_dir = is_inside_dir(get_git_dir());
 199        return inside_git_dir;
 200}
 201
 202int is_inside_work_tree(void)
 203{
 204        if (inside_work_tree < 0)
 205                inside_work_tree = is_inside_dir(get_git_work_tree());
 206        return inside_work_tree;
 207}
 208
 209/*
 210 * set_work_tree() is only ever called if you set GIT_DIR explicitly.
 211 * The old behaviour (which we retain here) is to set the work tree root
 212 * to the cwd, unless overridden by the config, the command line, or
 213 * GIT_WORK_TREE.
 214 */
 215static const char *set_work_tree(const char *dir)
 216{
 217        char buffer[PATH_MAX + 1];
 218
 219        if (!getcwd(buffer, sizeof(buffer)))
 220                die ("Could not get the current working directory");
 221        git_work_tree_cfg = xstrdup(buffer);
 222        inside_work_tree = 1;
 223
 224        return NULL;
 225}
 226
 227void setup_work_tree(void)
 228{
 229        const char *work_tree, *git_dir;
 230        static int initialized = 0;
 231
 232        if (initialized)
 233                return;
 234        work_tree = get_git_work_tree();
 235        git_dir = get_git_dir();
 236        if (!is_absolute_path(git_dir))
 237                git_dir = make_absolute_path(git_dir);
 238        if (!work_tree || chdir(work_tree))
 239                die("This operation must be run in a work tree");
 240        set_git_dir(make_relative_path(git_dir, work_tree));
 241        initialized = 1;
 242}
 243
 244static int check_repository_format_gently(int *nongit_ok)
 245{
 246        git_config(check_repository_format_version, NULL);
 247        if (GIT_REPO_VERSION < repository_format_version) {
 248                if (!nongit_ok)
 249                        die ("Expected git repo version <= %d, found %d",
 250                             GIT_REPO_VERSION, repository_format_version);
 251                warning("Expected git repo version <= %d, found %d",
 252                        GIT_REPO_VERSION, repository_format_version);
 253                warning("Please upgrade Git");
 254                *nongit_ok = -1;
 255                return -1;
 256        }
 257        return 0;
 258}
 259
 260/*
 261 * Try to read the location of the git directory from the .git file,
 262 * return path to git directory if found.
 263 */
 264const char *read_gitfile_gently(const char *path)
 265{
 266        char *buf;
 267        char *dir;
 268        const char *slash;
 269        struct stat st;
 270        int fd;
 271        size_t len;
 272
 273        if (stat(path, &st))
 274                return NULL;
 275        if (!S_ISREG(st.st_mode))
 276                return NULL;
 277        fd = open(path, O_RDONLY);
 278        if (fd < 0)
 279                die_errno("Error opening '%s'", path);
 280        buf = xmalloc(st.st_size + 1);
 281        len = read_in_full(fd, buf, st.st_size);
 282        close(fd);
 283        if (len != st.st_size)
 284                die("Error reading %s", path);
 285        buf[len] = '\0';
 286        if (prefixcmp(buf, "gitdir: "))
 287                die("Invalid gitfile format: %s", path);
 288        while (buf[len - 1] == '\n' || buf[len - 1] == '\r')
 289                len--;
 290        if (len < 9)
 291                die("No path in gitfile: %s", path);
 292        buf[len] = '\0';
 293        dir = buf + 8;
 294
 295        if (!is_absolute_path(dir) && (slash = strrchr(path, '/'))) {
 296                size_t pathlen = slash+1 - path;
 297                size_t dirlen = pathlen + len - 8;
 298                dir = xmalloc(dirlen + 1);
 299                strncpy(dir, path, pathlen);
 300                strncpy(dir + pathlen, buf + 8, len - 8);
 301                dir[dirlen] = '\0';
 302                free(buf);
 303                buf = dir;
 304        }
 305
 306        if (!is_git_directory(dir))
 307                die("Not a git repository: %s", dir);
 308        path = make_absolute_path(dir);
 309
 310        free(buf);
 311        return path;
 312}
 313
 314/*
 315 * We cannot decide in this function whether we are in the work tree or
 316 * not, since the config can only be read _after_ this function was called.
 317 */
 318const char *setup_git_directory_gently(int *nongit_ok)
 319{
 320        const char *work_tree_env = getenv(GIT_WORK_TREE_ENVIRONMENT);
 321        const char *env_ceiling_dirs = getenv(CEILING_DIRECTORIES_ENVIRONMENT);
 322        static char cwd[PATH_MAX+1];
 323        const char *gitdirenv;
 324        const char *gitfile_dir;
 325        int len, offset, ceil_offset, root_len;
 326
 327        /*
 328         * Let's assume that we are in a git repository.
 329         * If it turns out later that we are somewhere else, the value will be
 330         * updated accordingly.
 331         */
 332        if (nongit_ok)
 333                *nongit_ok = 0;
 334
 335        /*
 336         * If GIT_DIR is set explicitly, we're not going
 337         * to do any discovery, but we still do repository
 338         * validation.
 339         */
 340        gitdirenv = getenv(GIT_DIR_ENVIRONMENT);
 341        if (gitdirenv) {
 342                if (PATH_MAX - 40 < strlen(gitdirenv))
 343                        die("'$%s' too big", GIT_DIR_ENVIRONMENT);
 344                if (is_git_directory(gitdirenv)) {
 345                        static char buffer[1024 + 1];
 346                        const char *retval;
 347
 348                        if (!work_tree_env) {
 349                                retval = set_work_tree(gitdirenv);
 350                                /* config may override worktree */
 351                                if (check_repository_format_gently(nongit_ok))
 352                                        return NULL;
 353                                return retval;
 354                        }
 355                        if (check_repository_format_gently(nongit_ok))
 356                                return NULL;
 357                        retval = get_relative_cwd(buffer, sizeof(buffer) - 1,
 358                                        get_git_work_tree());
 359                        if (!retval || !*retval)
 360                                return NULL;
 361                        set_git_dir(make_absolute_path(gitdirenv));
 362                        if (chdir(work_tree_env) < 0)
 363                                die_errno ("Could not chdir to '%s'", work_tree_env);
 364                        strcat(buffer, "/");
 365                        return retval;
 366                }
 367                if (nongit_ok) {
 368                        *nongit_ok = 1;
 369                        return NULL;
 370                }
 371                die("Not a git repository: '%s'", gitdirenv);
 372        }
 373
 374        if (!getcwd(cwd, sizeof(cwd)-1))
 375                die_errno("Unable to read current working directory");
 376
 377        ceil_offset = longest_ancestor_length(cwd, env_ceiling_dirs);
 378        if (ceil_offset < 0 && has_dos_drive_prefix(cwd))
 379                ceil_offset = 1;
 380
 381        /*
 382         * Test in the following order (relative to the cwd):
 383         * - .git (file containing "gitdir: <path>")
 384         * - .git/
 385         * - ./ (bare)
 386         * - ../.git
 387         * - ../.git/
 388         * - ../ (bare)
 389         * - ../../.git/
 390         *   etc.
 391         */
 392        offset = len = strlen(cwd);
 393        for (;;) {
 394                gitfile_dir = read_gitfile_gently(DEFAULT_GIT_DIR_ENVIRONMENT);
 395                if (gitfile_dir) {
 396                        if (set_git_dir(gitfile_dir))
 397                                die("Repository setup failed");
 398                        break;
 399                }
 400                if (is_git_directory(DEFAULT_GIT_DIR_ENVIRONMENT))
 401                        break;
 402                if (is_git_directory(".")) {
 403                        inside_git_dir = 1;
 404                        if (!work_tree_env)
 405                                inside_work_tree = 0;
 406                        if (offset != len) {
 407                                root_len = offset_1st_component(cwd);
 408                                cwd[offset > root_len ? offset : root_len] = '\0';
 409                                set_git_dir(cwd);
 410                        } else
 411                                set_git_dir(".");
 412                        check_repository_format_gently(nongit_ok);
 413                        return NULL;
 414                }
 415                while (--offset > ceil_offset && cwd[offset] != '/');
 416                if (offset <= ceil_offset) {
 417                        if (nongit_ok) {
 418                                if (chdir(cwd))
 419                                        die_errno("Cannot come back to cwd");
 420                                *nongit_ok = 1;
 421                                return NULL;
 422                        }
 423                        die("Not a git repository (or any of the parent directories): %s", DEFAULT_GIT_DIR_ENVIRONMENT);
 424                }
 425                if (chdir(".."))
 426                        die_errno("Cannot change to '%s/..'", cwd);
 427        }
 428
 429        inside_git_dir = 0;
 430        if (!work_tree_env)
 431                inside_work_tree = 1;
 432        root_len = offset_1st_component(cwd);
 433        git_work_tree_cfg = xstrndup(cwd, offset > root_len ? offset : root_len);
 434        if (check_repository_format_gently(nongit_ok))
 435                return NULL;
 436        if (offset == len)
 437                return NULL;
 438
 439        /* Make "offset" point to past the '/', and add a '/' at the end */
 440        offset++;
 441        cwd[len++] = '/';
 442        cwd[len] = 0;
 443        return cwd + offset;
 444}
 445
 446int git_config_perm(const char *var, const char *value)
 447{
 448        int i;
 449        char *endptr;
 450
 451        if (value == NULL)
 452                return PERM_GROUP;
 453
 454        if (!strcmp(value, "umask"))
 455                return PERM_UMASK;
 456        if (!strcmp(value, "group"))
 457                return PERM_GROUP;
 458        if (!strcmp(value, "all") ||
 459            !strcmp(value, "world") ||
 460            !strcmp(value, "everybody"))
 461                return PERM_EVERYBODY;
 462
 463        /* Parse octal numbers */
 464        i = strtol(value, &endptr, 8);
 465
 466        /* If not an octal number, maybe true/false? */
 467        if (*endptr != 0)
 468                return git_config_bool(var, value) ? PERM_GROUP : PERM_UMASK;
 469
 470        /*
 471         * Treat values 0, 1 and 2 as compatibility cases, otherwise it is
 472         * a chmod value to restrict to.
 473         */
 474        switch (i) {
 475        case PERM_UMASK:               /* 0 */
 476                return PERM_UMASK;
 477        case OLD_PERM_GROUP:           /* 1 */
 478                return PERM_GROUP;
 479        case OLD_PERM_EVERYBODY:       /* 2 */
 480                return PERM_EVERYBODY;
 481        }
 482
 483        /* A filemode value was given: 0xxx */
 484
 485        if ((i & 0600) != 0600)
 486                die("Problem with core.sharedRepository filemode value "
 487                    "(0%.3o).\nThe owner of files must always have "
 488                    "read and write permissions.", i);
 489
 490        /*
 491         * Mask filemode value. Others can not get write permission.
 492         * x flags for directories are handled separately.
 493         */
 494        return -(i & 0666);
 495}
 496
 497int check_repository_format_version(const char *var, const char *value, void *cb)
 498{
 499        if (strcmp(var, "core.repositoryformatversion") == 0)
 500                repository_format_version = git_config_int(var, value);
 501        else if (strcmp(var, "core.sharedrepository") == 0)
 502                shared_repository = git_config_perm(var, value);
 503        else if (strcmp(var, "core.bare") == 0) {
 504                is_bare_repository_cfg = git_config_bool(var, value);
 505                if (is_bare_repository_cfg == 1)
 506                        inside_work_tree = -1;
 507        } else if (strcmp(var, "core.worktree") == 0) {
 508                if (!value)
 509                        return config_error_nonbool(var);
 510                free(git_work_tree_cfg);
 511                git_work_tree_cfg = xstrdup(value);
 512                inside_work_tree = -1;
 513        }
 514        return 0;
 515}
 516
 517int check_repository_format(void)
 518{
 519        return check_repository_format_gently(NULL);
 520}
 521
 522const char *setup_git_directory(void)
 523{
 524        const char *retval = setup_git_directory_gently(NULL);
 525
 526        /* If the work tree is not the default one, recompute prefix */
 527        if (inside_work_tree < 0) {
 528                static char buffer[PATH_MAX + 1];
 529                char *rel;
 530                if (retval && chdir(retval))
 531                        die_errno ("Could not jump back into original cwd");
 532                rel = get_relative_cwd(buffer, PATH_MAX, get_git_work_tree());
 533                if (rel && *rel && chdir(get_git_work_tree()))
 534                        die_errno ("Could not jump to working directory");
 535                return rel && *rel ? strcat(rel, "/") : NULL;
 536        }
 537
 538        return retval;
 539}