| #include "cache.h" |
| #include "dir.h" |
| |
| static int inside_git_dir = -1; |
| static int inside_work_tree = -1; |
| |
| const char *prefix_path(const char *prefix, int len, const char *path) |
| { |
| const char *orig = path; |
| char *sanitized = xmalloc(len + strlen(path) + 1); |
| if (is_absolute_path(orig)) |
| strcpy(sanitized, path); |
| else { |
| if (len) |
| memcpy(sanitized, prefix, len); |
| strcpy(sanitized + len, path); |
| } |
| if (normalize_path_copy(sanitized, sanitized)) |
| goto error_out; |
| if (is_absolute_path(orig)) { |
| const char *work_tree = get_git_work_tree(); |
| size_t len = strlen(work_tree); |
| size_t total = strlen(sanitized) + 1; |
| if (strncmp(sanitized, work_tree, len) || |
| (sanitized[len] != '\0' && sanitized[len] != '/')) { |
| error_out: |
| die("'%s' is outside repository", orig); |
| } |
| if (sanitized[len] == '/') |
| len++; |
| memmove(sanitized, sanitized + len, total - len); |
| } |
| return sanitized; |
| } |
| |
| /* |
| * Unlike prefix_path, this should be used if the named file does |
| * not have to interact with index entry; i.e. name of a random file |
| * on the filesystem. |
| */ |
| const char *prefix_filename(const char *pfx, int pfx_len, const char *arg) |
| { |
| static char path[PATH_MAX]; |
| #ifndef __MINGW32__ |
| if (!pfx || !*pfx || is_absolute_path(arg)) |
| return arg; |
| memcpy(path, pfx, pfx_len); |
| strcpy(path + pfx_len, arg); |
| #else |
| char *p; |
| /* don't add prefix to absolute paths, but still replace '\' by '/' */ |
| if (is_absolute_path(arg)) |
| pfx_len = 0; |
| else |
| memcpy(path, pfx, pfx_len); |
| strcpy(path + pfx_len, arg); |
| for (p = path + pfx_len; *p; p++) |
| if (*p == '\\') |
| *p = '/'; |
| #endif |
| return path; |
| } |
| |
| /* |
| * Verify a filename that we got as an argument for a pathspec |
| * entry. Note that a filename that begins with "-" never verifies |
| * as true, because even if such a filename were to exist, we want |
| * it to be preceded by the "--" marker (or we want the user to |
| * use a format like "./-filename") |
| */ |
| void verify_filename(const char *prefix, const char *arg) |
| { |
| const char *name; |
| struct stat st; |
| |
| if (*arg == '-') |
| die("bad flag '%s' used after filename", arg); |
| name = prefix ? prefix_filename(prefix, strlen(prefix), arg) : arg; |
| if (!lstat(name, &st)) |
| return; |
| if (errno == ENOENT) |
| die("ambiguous argument '%s': unknown revision or path not in the working tree.\n" |
| "Use '--' to separate paths from revisions", arg); |
| die_errno("failed to stat '%s'", arg); |
| } |
| |
| /* |
| * Opposite of the above: the command line did not have -- marker |
| * and we parsed the arg as a refname. It should not be interpretable |
| * as a filename. |
| */ |
| void verify_non_filename(const char *prefix, const char *arg) |
| { |
| const char *name; |
| struct stat st; |
| |
| if (!is_inside_work_tree() || is_inside_git_dir()) |
| return; |
| if (*arg == '-') |
| return; /* flag */ |
| name = prefix ? prefix_filename(prefix, strlen(prefix), arg) : arg; |
| if (!lstat(name, &st)) |
| die("ambiguous argument '%s': both revision and filename\n" |
| "Use '--' to separate filenames from revisions", arg); |
| if (errno != ENOENT && errno != ENOTDIR) |
| die_errno("failed to stat '%s'", arg); |
| } |
| |
| const char **get_pathspec(const char *prefix, const char **pathspec) |
| { |
| const char *entry = *pathspec; |
| const char **src, **dst; |
| int prefixlen; |
| |
| if (!prefix && !entry) |
| return NULL; |
| |
| if (!entry) { |
| static const char *spec[2]; |
| spec[0] = prefix; |
| spec[1] = NULL; |
| return spec; |
| } |
| |
| /* Otherwise we have to re-write the entries.. */ |
| src = pathspec; |
| dst = pathspec; |
| prefixlen = prefix ? strlen(prefix) : 0; |
| while (*src) { |
| const char *p = prefix_path(prefix, prefixlen, *src); |
| *(dst++) = p; |
| src++; |
| } |
| *dst = NULL; |
| if (!*pathspec) |
| return NULL; |
| return pathspec; |
| } |
| |
| /* |
| * Test if it looks like we're at a git directory. |
| * We want to see: |
| * |
| * - either an objects/ directory _or_ the proper |
| * GIT_OBJECT_DIRECTORY environment variable |
| * - a refs/ directory |
| * - either a HEAD symlink or a HEAD file that is formatted as |
| * a proper "ref:", or a regular file HEAD that has a properly |
| * formatted sha1 object name. |
| */ |
| static int is_git_directory(const char *suspect) |
| { |
| char path[PATH_MAX]; |
| size_t len = strlen(suspect); |
| |
| strcpy(path, suspect); |
| if (getenv(DB_ENVIRONMENT)) { |
| if (access(getenv(DB_ENVIRONMENT), X_OK)) |
| return 0; |
| } |
| else { |
| strcpy(path + len, "/objects"); |
| if (access(path, X_OK)) |
| return 0; |
| } |
| |
| strcpy(path + len, "/refs"); |
| if (access(path, X_OK)) |
| return 0; |
| |
| strcpy(path + len, "/HEAD"); |
| if (validate_headref(path)) |
| return 0; |
| |
| return 1; |
| } |
| |
| int is_inside_git_dir(void) |
| { |
| if (inside_git_dir < 0) |
| inside_git_dir = is_inside_dir(get_git_dir()); |
| return inside_git_dir; |
| } |
| |
| int is_inside_work_tree(void) |
| { |
| if (inside_work_tree < 0) |
| inside_work_tree = is_inside_dir(get_git_work_tree()); |
| return inside_work_tree; |
| } |
| |
| /* |
| * set_work_tree() is only ever called if you set GIT_DIR explicitely. |
| * The old behaviour (which we retain here) is to set the work tree root |
| * to the cwd, unless overridden by the config, the command line, or |
| * GIT_WORK_TREE. |
| */ |
| static const char *set_work_tree(const char *dir) |
| { |
| char buffer[PATH_MAX + 1]; |
| |
| if (!getcwd(buffer, sizeof(buffer))) |
| die ("Could not get the current working directory"); |
| git_work_tree_cfg = xstrdup(buffer); |
| inside_work_tree = 1; |
| |
| return NULL; |
| } |
| |
| void setup_work_tree(void) |
| { |
| const char *work_tree, *git_dir; |
| static int initialized = 0; |
| |
| if (initialized) |
| return; |
| work_tree = get_git_work_tree(); |
| git_dir = get_git_dir(); |
| if (!is_absolute_path(git_dir)) |
| git_dir = make_absolute_path(git_dir); |
| if (!work_tree || chdir(work_tree)) |
| die("This operation must be run in a work tree"); |
| set_git_dir(make_relative_path(git_dir, work_tree)); |
| initialized = 1; |
| } |
| |
| static int check_repository_format_gently(int *nongit_ok) |
| { |
| git_config(check_repository_format_version, NULL); |
| if (GIT_REPO_VERSION < repository_format_version) { |
| if (!nongit_ok) |
| die ("Expected git repo version <= %d, found %d", |
| GIT_REPO_VERSION, repository_format_version); |
| warning("Expected git repo version <= %d, found %d", |
| GIT_REPO_VERSION, repository_format_version); |
| warning("Please upgrade Git"); |
| *nongit_ok = -1; |
| return -1; |
| } |
| return 0; |
| } |
| |
| /* |
| * Try to read the location of the git directory from the .git file, |
| * return path to git directory if found. |
| */ |
| const char *read_gitfile_gently(const char *path) |
| { |
| char *buf; |
| struct stat st; |
| int fd; |
| size_t len; |
| |
| if (stat(path, &st)) |
| return NULL; |
| if (!S_ISREG(st.st_mode)) |
| return NULL; |
| fd = open(path, O_RDONLY); |
| if (fd < 0) |
| die_errno("Error opening '%s'", path); |
| buf = xmalloc(st.st_size + 1); |
| len = read_in_full(fd, buf, st.st_size); |
| close(fd); |
| if (len != st.st_size) |
| die("Error reading %s", path); |
| buf[len] = '\0'; |
| if (prefixcmp(buf, "gitdir: ")) |
| die("Invalid gitfile format: %s", path); |
| while (buf[len - 1] == '\n' || buf[len - 1] == '\r') |
| len--; |
| if (len < 9) |
| die("No path in gitfile: %s", path); |
| buf[len] = '\0'; |
| if (!is_git_directory(buf + 8)) |
| die("Not a git repository: %s", buf + 8); |
| path = make_absolute_path(buf + 8); |
| free(buf); |
| return path; |
| } |
| |
| /* |
| * We cannot decide in this function whether we are in the work tree or |
| * not, since the config can only be read _after_ this function was called. |
| */ |
| const char *setup_git_directory_gently(int *nongit_ok) |
| { |
| const char *work_tree_env = getenv(GIT_WORK_TREE_ENVIRONMENT); |
| const char *env_ceiling_dirs = getenv(CEILING_DIRECTORIES_ENVIRONMENT); |
| static char cwd[PATH_MAX+1]; |
| const char *gitdirenv; |
| const char *gitfile_dir; |
| int len, offset, ceil_offset; |
| |
| /* |
| * Let's assume that we are in a git repository. |
| * If it turns out later that we are somewhere else, the value will be |
| * updated accordingly. |
| */ |
| if (nongit_ok) |
| *nongit_ok = 0; |
| |
| /* |
| * If GIT_DIR is set explicitly, we're not going |
| * to do any discovery, but we still do repository |
| * validation. |
| */ |
| gitdirenv = getenv(GIT_DIR_ENVIRONMENT); |
| if (gitdirenv) { |
| if (PATH_MAX - 40 < strlen(gitdirenv)) |
| die("'$%s' too big", GIT_DIR_ENVIRONMENT); |
| if (is_git_directory(gitdirenv)) { |
| static char buffer[1024 + 1]; |
| const char *retval; |
| |
| if (!work_tree_env) { |
| retval = set_work_tree(gitdirenv); |
| /* config may override worktree */ |
| if (check_repository_format_gently(nongit_ok)) |
| return NULL; |
| return retval; |
| } |
| if (check_repository_format_gently(nongit_ok)) |
| return NULL; |
| retval = get_relative_cwd(buffer, sizeof(buffer) - 1, |
| get_git_work_tree()); |
| if (!retval || !*retval) |
| return NULL; |
| set_git_dir(make_absolute_path(gitdirenv)); |
| if (chdir(work_tree_env) < 0) |
| die_errno ("Could not chdir to '%s'", work_tree_env); |
| strcat(buffer, "/"); |
| return retval; |
| } |
| if (nongit_ok) { |
| *nongit_ok = 1; |
| return NULL; |
| } |
| die("Not a git repository: '%s'", gitdirenv); |
| } |
| |
| if (!getcwd(cwd, sizeof(cwd)-1)) |
| die_errno("Unable to read current working directory"); |
| |
| ceil_offset = longest_ancestor_length(cwd, env_ceiling_dirs); |
| if (ceil_offset < 0 && has_dos_drive_prefix(cwd)) |
| ceil_offset = 1; |
| |
| /* |
| * Test in the following order (relative to the cwd): |
| * - .git (file containing "gitdir: <path>") |
| * - .git/ |
| * - ./ (bare) |
| * - ../.git |
| * - ../.git/ |
| * - ../ (bare) |
| * - ../../.git/ |
| * etc. |
| */ |
| offset = len = strlen(cwd); |
| for (;;) { |
| gitfile_dir = read_gitfile_gently(DEFAULT_GIT_DIR_ENVIRONMENT); |
| if (gitfile_dir) { |
| if (set_git_dir(gitfile_dir)) |
| die("Repository setup failed"); |
| break; |
| } |
| if (is_git_directory(DEFAULT_GIT_DIR_ENVIRONMENT)) |
| break; |
| if (is_git_directory(".")) { |
| inside_git_dir = 1; |
| if (!work_tree_env) |
| inside_work_tree = 0; |
| if (offset != len) { |
| cwd[offset] = '\0'; |
| setenv(GIT_DIR_ENVIRONMENT, cwd, 1); |
| } else |
| setenv(GIT_DIR_ENVIRONMENT, ".", 1); |
| check_repository_format_gently(nongit_ok); |
| return NULL; |
| } |
| while (--offset > ceil_offset && cwd[offset] != '/'); |
| if (offset <= ceil_offset) { |
| if (nongit_ok) { |
| if (chdir(cwd)) |
| die_errno("Cannot come back to cwd"); |
| *nongit_ok = 1; |
| return NULL; |
| } |
| die("Not a git repository (or any of the parent directories): %s", DEFAULT_GIT_DIR_ENVIRONMENT); |
| } |
| if (chdir("..")) |
| die_errno("Cannot change to '%s/..'", cwd); |
| } |
| |
| inside_git_dir = 0; |
| if (!work_tree_env) |
| inside_work_tree = 1; |
| git_work_tree_cfg = xstrndup(cwd, offset); |
| if (check_repository_format_gently(nongit_ok)) |
| return NULL; |
| if (offset == len) |
| return NULL; |
| |
| /* Make "offset" point to past the '/', and add a '/' at the end */ |
| offset++; |
| cwd[len++] = '/'; |
| cwd[len] = 0; |
| return cwd + offset; |
| } |
| |
| int git_config_perm(const char *var, const char *value) |
| { |
| int i; |
| char *endptr; |
| |
| if (value == NULL) |
| return PERM_GROUP; |
| |
| if (!strcmp(value, "umask")) |
| return PERM_UMASK; |
| if (!strcmp(value, "group")) |
| return PERM_GROUP; |
| if (!strcmp(value, "all") || |
| !strcmp(value, "world") || |
| !strcmp(value, "everybody")) |
| return PERM_EVERYBODY; |
| |
| /* Parse octal numbers */ |
| i = strtol(value, &endptr, 8); |
| |
| /* If not an octal number, maybe true/false? */ |
| if (*endptr != 0) |
| return git_config_bool(var, value) ? PERM_GROUP : PERM_UMASK; |
| |
| /* |
| * Treat values 0, 1 and 2 as compatibility cases, otherwise it is |
| * a chmod value to restrict to. |
| */ |
| switch (i) { |
| case PERM_UMASK: /* 0 */ |
| return PERM_UMASK; |
| case OLD_PERM_GROUP: /* 1 */ |
| return PERM_GROUP; |
| case OLD_PERM_EVERYBODY: /* 2 */ |
| return PERM_EVERYBODY; |
| } |
| |
| /* A filemode value was given: 0xxx */ |
| |
| if ((i & 0600) != 0600) |
| die("Problem with core.sharedRepository filemode value " |
| "(0%.3o).\nThe owner of files must always have " |
| "read and write permissions.", i); |
| |
| /* |
| * Mask filemode value. Others can not get write permission. |
| * x flags for directories are handled separately. |
| */ |
| return -(i & 0666); |
| } |
| |
| int check_repository_format_version(const char *var, const char *value, void *cb) |
| { |
| if (strcmp(var, "core.repositoryformatversion") == 0) |
| repository_format_version = git_config_int(var, value); |
| else if (strcmp(var, "core.sharedrepository") == 0) |
| shared_repository = git_config_perm(var, value); |
| else if (strcmp(var, "core.bare") == 0) { |
| is_bare_repository_cfg = git_config_bool(var, value); |
| if (is_bare_repository_cfg == 1) |
| inside_work_tree = -1; |
| } else if (strcmp(var, "core.worktree") == 0) { |
| if (!value) |
| return config_error_nonbool(var); |
| free(git_work_tree_cfg); |
| git_work_tree_cfg = xstrdup(value); |
| inside_work_tree = -1; |
| } |
| return 0; |
| } |
| |
| int check_repository_format(void) |
| { |
| return check_repository_format_gently(NULL); |
| } |
| |
| const char *setup_git_directory(void) |
| { |
| const char *retval = setup_git_directory_gently(NULL); |
| |
| /* If the work tree is not the default one, recompute prefix */ |
| if (inside_work_tree < 0) { |
| static char buffer[PATH_MAX + 1]; |
| char *rel; |
| if (retval && chdir(retval)) |
| die_errno ("Could not jump back into original cwd"); |
| rel = get_relative_cwd(buffer, PATH_MAX, get_git_work_tree()); |
| if (rel && *rel && chdir(get_git_work_tree())) |
| die_errno ("Could not jump to working directory"); |
| return rel && *rel ? strcat(rel, "/") : NULL; |
| } |
| |
| return retval; |
| } |