| #include "cache.h" |
| #include "dir.h" |
| #include "string-list.h" |
| |
| static int inside_git_dir = -1; |
| static int inside_work_tree = -1; |
| |
| static char *prefix_path_gently(const char *prefix, int len, const char *path) |
| { |
| const char *orig = path; |
| char *sanitized; |
| if (is_absolute_path(orig)) { |
| const char *temp = real_path(path); |
| sanitized = xmalloc(len + strlen(temp) + 1); |
| strcpy(sanitized, temp); |
| } else { |
| sanitized = xmalloc(len + strlen(path) + 1); |
| if (len) |
| memcpy(sanitized, prefix, len); |
| strcpy(sanitized + len, path); |
| } |
| if (normalize_path_copy(sanitized, sanitized)) |
| goto error_out; |
| if (is_absolute_path(orig)) { |
| size_t root_len, len, total; |
| const char *work_tree = get_git_work_tree(); |
| if (!work_tree) |
| goto error_out; |
| len = strlen(work_tree); |
| root_len = offset_1st_component(work_tree); |
| total = strlen(sanitized) + 1; |
| if (strncmp(sanitized, work_tree, len) || |
| (len > root_len && sanitized[len] != '\0' && sanitized[len] != '/')) { |
| error_out: |
| free(sanitized); |
| return NULL; |
| } |
| if (sanitized[len] == '/') |
| len++; |
| memmove(sanitized, sanitized + len, total - len); |
| } |
| return sanitized; |
| } |
| |
| char *prefix_path(const char *prefix, int len, const char *path) |
| { |
| char *r = prefix_path_gently(prefix, len, path); |
| if (!r) |
| die("'%s' is outside repository", path); |
| return r; |
| } |
| |
| int path_inside_repo(const char *prefix, const char *path) |
| { |
| int len = prefix ? strlen(prefix) : 0; |
| char *r = prefix_path_gently(prefix, len, path); |
| if (r) { |
| free(r); |
| return 1; |
| } |
| return 0; |
| } |
| |
| int check_filename(const char *prefix, const char *arg) |
| { |
| const char *name; |
| struct stat st; |
| |
| if (!prefixcmp(arg, ":/")) { |
| if (arg[2] == '\0') /* ":/" is root dir, always exists */ |
| return 1; |
| name = arg + 2; |
| } else if (prefix) |
| name = prefix_filename(prefix, strlen(prefix), arg); |
| else |
| name = arg; |
| if (!lstat(name, &st)) |
| return 1; /* file exists */ |
| if (errno == ENOENT || errno == ENOTDIR) |
| return 0; /* file does not exist */ |
| die_errno("failed to stat '%s'", arg); |
| } |
| |
| static void NORETURN die_verify_filename(const char *prefix, |
| const char *arg, |
| int diagnose_misspelt_rev) |
| { |
| if (!diagnose_misspelt_rev) |
| die("%s: no such path in the working tree.\n" |
| "Use 'git <command> -- <path>...' to specify paths that do not exist locally.", |
| arg); |
| /* |
| * Saying "'(icase)foo' does not exist in the index" when the |
| * user gave us ":(icase)foo" is just stupid. A magic pathspec |
| * begins with a colon and is followed by a non-alnum; do not |
| * let maybe_die_on_misspelt_object_name() even trigger. |
| */ |
| if (!(arg[0] == ':' && !isalnum(arg[1]))) |
| maybe_die_on_misspelt_object_name(arg, prefix); |
| |
| /* ... or fall back the most general message. */ |
| die("ambiguous argument '%s': unknown revision or path not in the working tree.\n" |
| "Use '--' to separate paths from revisions, like this:\n" |
| "'git <command> [<revision>...] -- [<file>...]'", arg); |
| |
| } |
| |
| /* |
| * 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") |
| * |
| * The "diagnose_misspelt_rev" is used to provide a user-friendly |
| * diagnosis when dying upon finding that "name" is not a pathname. |
| * If set to 1, the diagnosis will try to diagnose "name" as an |
| * invalid object name (e.g. HEAD:foo). If set to 0, the diagnosis |
| * will only complain about an inexisting file. |
| * |
| * This function is typically called to check that a "file or rev" |
| * argument is unambiguous. In this case, the caller will want |
| * diagnose_misspelt_rev == 1 when verifying the first non-rev |
| * argument (which could have been a revision), and |
| * diagnose_misspelt_rev == 0 for the next ones (because we already |
| * saw a filename, there's not ambiguity anymore). |
| */ |
| void verify_filename(const char *prefix, |
| const char *arg, |
| int diagnose_misspelt_rev) |
| { |
| if (*arg == '-') |
| die("bad flag '%s' used after filename", arg); |
| if (check_filename(prefix, arg)) |
| return; |
| die_verify_filename(prefix, arg, diagnose_misspelt_rev); |
| } |
| |
| /* |
| * 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) |
| { |
| if (!is_inside_work_tree() || is_inside_git_dir()) |
| return; |
| if (*arg == '-') |
| return; /* flag */ |
| if (!check_filename(prefix, arg)) |
| return; |
| die("ambiguous argument '%s': both revision and filename\n" |
| "Use '--' to separate paths from revisions, like this:\n" |
| "'git <command> [<revision>...] -- [<file>...]'", arg); |
| } |
| |
| /* |
| * Magic pathspec |
| * |
| * NEEDSWORK: These need to be moved to dir.h or even to a new |
| * pathspec.h when we restructure get_pathspec() users to use the |
| * "struct pathspec" interface. |
| * |
| * Possible future magic semantics include stuff like: |
| * |
| * { PATHSPEC_NOGLOB, '!', "noglob" }, |
| * { PATHSPEC_ICASE, '\0', "icase" }, |
| * { PATHSPEC_RECURSIVE, '*', "recursive" }, |
| * { PATHSPEC_REGEXP, '\0', "regexp" }, |
| * |
| */ |
| #define PATHSPEC_FROMTOP (1<<0) |
| |
| static struct pathspec_magic { |
| unsigned bit; |
| char mnemonic; /* this cannot be ':'! */ |
| const char *name; |
| } pathspec_magic[] = { |
| { PATHSPEC_FROMTOP, '/', "top" }, |
| }; |
| |
| /* |
| * Take an element of a pathspec and check for magic signatures. |
| * Append the result to the prefix. |
| * |
| * For now, we only parse the syntax and throw out anything other than |
| * "top" magic. |
| * |
| * NEEDSWORK: This needs to be rewritten when we start migrating |
| * get_pathspec() users to use the "struct pathspec" interface. For |
| * example, a pathspec element may be marked as case-insensitive, but |
| * the prefix part must always match literally, and a single stupid |
| * string cannot express such a case. |
| */ |
| static const char *prefix_pathspec(const char *prefix, int prefixlen, const char *elt) |
| { |
| unsigned magic = 0; |
| const char *copyfrom = elt; |
| int i; |
| |
| if (elt[0] != ':') { |
| ; /* nothing to do */ |
| } else if (elt[1] == '(') { |
| /* longhand */ |
| const char *nextat; |
| for (copyfrom = elt + 2; |
| *copyfrom && *copyfrom != ')'; |
| copyfrom = nextat) { |
| size_t len = strcspn(copyfrom, ",)"); |
| if (copyfrom[len] == ',') |
| nextat = copyfrom + len + 1; |
| else |
| /* handle ')' and '\0' */ |
| nextat = copyfrom + len; |
| if (!len) |
| continue; |
| for (i = 0; i < ARRAY_SIZE(pathspec_magic); i++) |
| if (strlen(pathspec_magic[i].name) == len && |
| !strncmp(pathspec_magic[i].name, copyfrom, len)) { |
| magic |= pathspec_magic[i].bit; |
| break; |
| } |
| if (ARRAY_SIZE(pathspec_magic) <= i) |
| die("Invalid pathspec magic '%.*s' in '%s'", |
| (int) len, copyfrom, elt); |
| } |
| if (*copyfrom != ')') |
| die("Missing ')' at the end of pathspec magic in '%s'", elt); |
| copyfrom++; |
| } else { |
| /* shorthand */ |
| for (copyfrom = elt + 1; |
| *copyfrom && *copyfrom != ':'; |
| copyfrom++) { |
| char ch = *copyfrom; |
| |
| if (!is_pathspec_magic(ch)) |
| break; |
| for (i = 0; i < ARRAY_SIZE(pathspec_magic); i++) |
| if (pathspec_magic[i].mnemonic == ch) { |
| magic |= pathspec_magic[i].bit; |
| break; |
| } |
| if (ARRAY_SIZE(pathspec_magic) <= i) |
| die("Unimplemented pathspec magic '%c' in '%s'", |
| ch, elt); |
| } |
| if (*copyfrom == ':') |
| copyfrom++; |
| } |
| |
| if (magic & PATHSPEC_FROMTOP) |
| return xstrdup(copyfrom); |
| else |
| return prefix_path(prefix, prefixlen, copyfrom); |
| } |
| |
| /* |
| * N.B. get_pathspec() is deprecated in favor of the "struct pathspec" |
| * based interface - see pathspec_magic above. |
| * |
| * Arguments: |
| * - prefix - a path relative to the root of the working tree |
| * - pathspec - a list of paths underneath the prefix path |
| * |
| * Iterates over pathspec, prepending each path with prefix, |
| * and return the resulting list. |
| * |
| * If pathspec is empty, return a singleton list containing prefix. |
| * |
| * If pathspec and prefix are both empty, return an empty list. |
| * |
| * This is typically used by built-in commands such as add.c, in order |
| * to normalize argv arguments provided to the built-in into a list of |
| * paths to process, all relative to the root of the working tree. |
| */ |
| 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) { |
| *(dst++) = prefix_pathspec(prefix, prefixlen, *src); |
| 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. |
| */ |
| int is_git_directory(const char *suspect) |
| { |
| char path[PATH_MAX]; |
| size_t len = strlen(suspect); |
| |
| if (PATH_MAX <= len + strlen("/objects")) |
| die("Too long path: %.*s", 60, 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; |
| } |
| |
| void setup_work_tree(void) |
| { |
| struct strbuf sb = STRBUF_INIT; |
| 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 = real_path(get_git_dir()); |
| if (!work_tree || chdir(work_tree)) |
| die("This operation must be run in a work tree"); |
| |
| /* |
| * Make sure subsequent git processes find correct worktree |
| * if $GIT_WORK_TREE is set relative |
| */ |
| if (getenv(GIT_WORK_TREE_ENVIRONMENT)) |
| setenv(GIT_WORK_TREE_ENVIRONMENT, ".", 1); |
| |
| set_git_dir(relative_path(git_dir, work_tree, &sb)); |
| initialized = 1; |
| |
| strbuf_release(&sb); |
| } |
| |
| static int check_repository_format_gently(const char *gitdir, int *nongit_ok) |
| { |
| char repo_config[PATH_MAX+1]; |
| |
| /* |
| * git_config() can't be used here because it calls git_pathdup() |
| * to get $GIT_CONFIG/config. That call will make setup_git_env() |
| * set git_dir to ".git". |
| * |
| * We are in gitdir setup, no git dir has been found useable yet. |
| * Use a gentler version of git_config() to check if this repo |
| * is a good one. |
| */ |
| snprintf(repo_config, PATH_MAX, "%s/config", gitdir); |
| git_config_early(check_repository_format_version, NULL, repo_config); |
| 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(const char *path) |
| { |
| char *buf; |
| char *dir; |
| const char *slash; |
| struct stat st; |
| int fd; |
| ssize_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'; |
| dir = buf + 8; |
| |
| if (!is_absolute_path(dir) && (slash = strrchr(path, '/'))) { |
| size_t pathlen = slash+1 - path; |
| size_t dirlen = pathlen + len - 8; |
| dir = xmalloc(dirlen + 1); |
| strncpy(dir, path, pathlen); |
| strncpy(dir + pathlen, buf + 8, len - 8); |
| dir[dirlen] = '\0'; |
| free(buf); |
| buf = dir; |
| } |
| |
| if (!is_git_directory(dir)) |
| die("Not a git repository: %s", dir); |
| path = real_path(dir); |
| |
| free(buf); |
| return path; |
| } |
| |
| static const char *setup_explicit_git_dir(const char *gitdirenv, |
| char *cwd, int len, |
| int *nongit_ok) |
| { |
| const char *work_tree_env = getenv(GIT_WORK_TREE_ENVIRONMENT); |
| const char *worktree; |
| char *gitfile; |
| int offset; |
| |
| if (PATH_MAX - 40 < strlen(gitdirenv)) |
| die("'$%s' too big", GIT_DIR_ENVIRONMENT); |
| |
| gitfile = (char*)read_gitfile(gitdirenv); |
| if (gitfile) { |
| gitfile = xstrdup(gitfile); |
| gitdirenv = gitfile; |
| } |
| |
| if (!is_git_directory(gitdirenv)) { |
| if (nongit_ok) { |
| *nongit_ok = 1; |
| free(gitfile); |
| return NULL; |
| } |
| die("Not a git repository: '%s'", gitdirenv); |
| } |
| |
| if (check_repository_format_gently(gitdirenv, nongit_ok)) { |
| free(gitfile); |
| return NULL; |
| } |
| |
| /* #3, #7, #11, #15, #19, #23, #27, #31 (see t1510) */ |
| if (work_tree_env) |
| set_git_work_tree(work_tree_env); |
| else if (is_bare_repository_cfg > 0) { |
| if (git_work_tree_cfg) /* #22.2, #30 */ |
| die("core.bare and core.worktree do not make sense"); |
| |
| /* #18, #26 */ |
| set_git_dir(gitdirenv); |
| free(gitfile); |
| return NULL; |
| } |
| else if (git_work_tree_cfg) { /* #6, #14 */ |
| if (is_absolute_path(git_work_tree_cfg)) |
| set_git_work_tree(git_work_tree_cfg); |
| else { |
| char core_worktree[PATH_MAX]; |
| if (chdir(gitdirenv)) |
| die_errno("Could not chdir to '%s'", gitdirenv); |
| if (chdir(git_work_tree_cfg)) |
| die_errno("Could not chdir to '%s'", git_work_tree_cfg); |
| if (!getcwd(core_worktree, PATH_MAX)) |
| die_errno("Could not get directory '%s'", git_work_tree_cfg); |
| if (chdir(cwd)) |
| die_errno("Could not come back to cwd"); |
| set_git_work_tree(core_worktree); |
| } |
| } |
| else if (!git_env_bool(GIT_IMPLICIT_WORK_TREE_ENVIRONMENT, 1)) { |
| /* #16d */ |
| set_git_dir(gitdirenv); |
| free(gitfile); |
| return NULL; |
| } |
| else /* #2, #10 */ |
| set_git_work_tree("."); |
| |
| /* set_git_work_tree() must have been called by now */ |
| worktree = get_git_work_tree(); |
| |
| /* both get_git_work_tree() and cwd are already normalized */ |
| if (!strcmp(cwd, worktree)) { /* cwd == worktree */ |
| set_git_dir(gitdirenv); |
| free(gitfile); |
| return NULL; |
| } |
| |
| offset = dir_inside_of(cwd, worktree); |
| if (offset >= 0) { /* cwd inside worktree? */ |
| set_git_dir(real_path(gitdirenv)); |
| if (chdir(worktree)) |
| die_errno("Could not chdir to '%s'", worktree); |
| cwd[len++] = '/'; |
| cwd[len] = '\0'; |
| free(gitfile); |
| return cwd + offset; |
| } |
| |
| /* cwd outside worktree */ |
| set_git_dir(gitdirenv); |
| free(gitfile); |
| return NULL; |
| } |
| |
| static const char *setup_discovered_git_dir(const char *gitdir, |
| char *cwd, int offset, int len, |
| int *nongit_ok) |
| { |
| if (check_repository_format_gently(gitdir, nongit_ok)) |
| return NULL; |
| |
| /* --work-tree is set without --git-dir; use discovered one */ |
| if (getenv(GIT_WORK_TREE_ENVIRONMENT) || git_work_tree_cfg) { |
| if (offset != len && !is_absolute_path(gitdir)) |
| gitdir = xstrdup(real_path(gitdir)); |
| if (chdir(cwd)) |
| die_errno("Could not come back to cwd"); |
| return setup_explicit_git_dir(gitdir, cwd, len, nongit_ok); |
| } |
| |
| /* #16.2, #17.2, #20.2, #21.2, #24, #25, #28, #29 (see t1510) */ |
| if (is_bare_repository_cfg > 0) { |
| set_git_dir(offset == len ? gitdir : real_path(gitdir)); |
| if (chdir(cwd)) |
| die_errno("Could not come back to cwd"); |
| return NULL; |
| } |
| |
| /* #0, #1, #5, #8, #9, #12, #13 */ |
| set_git_work_tree("."); |
| if (strcmp(gitdir, DEFAULT_GIT_DIR_ENVIRONMENT)) |
| set_git_dir(gitdir); |
| inside_git_dir = 0; |
| inside_work_tree = 1; |
| 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; |
| } |
| |
| /* #16.1, #17.1, #20.1, #21.1, #22.1 (see t1510) */ |
| static const char *setup_bare_git_dir(char *cwd, int offset, int len, int *nongit_ok) |
| { |
| int root_len; |
| |
| if (check_repository_format_gently(".", nongit_ok)) |
| return NULL; |
| |
| setenv(GIT_IMPLICIT_WORK_TREE_ENVIRONMENT, "0", 1); |
| |
| /* --work-tree is set without --git-dir; use discovered one */ |
| if (getenv(GIT_WORK_TREE_ENVIRONMENT) || git_work_tree_cfg) { |
| const char *gitdir; |
| |
| gitdir = offset == len ? "." : xmemdupz(cwd, offset); |
| if (chdir(cwd)) |
| die_errno("Could not come back to cwd"); |
| return setup_explicit_git_dir(gitdir, cwd, len, nongit_ok); |
| } |
| |
| inside_git_dir = 1; |
| inside_work_tree = 0; |
| if (offset != len) { |
| if (chdir(cwd)) |
| die_errno("Cannot come back to cwd"); |
| root_len = offset_1st_component(cwd); |
| cwd[offset > root_len ? offset : root_len] = '\0'; |
| set_git_dir(cwd); |
| } |
| else |
| set_git_dir("."); |
| return NULL; |
| } |
| |
| static const char *setup_nongit(const char *cwd, int *nongit_ok) |
| { |
| if (!nongit_ok) |
| die("Not a git repository (or any of the parent directories): %s", DEFAULT_GIT_DIR_ENVIRONMENT); |
| if (chdir(cwd)) |
| die_errno("Cannot come back to cwd"); |
| *nongit_ok = 1; |
| return NULL; |
| } |
| |
| static dev_t get_device_or_die(const char *path, const char *prefix, int prefix_len) |
| { |
| struct stat buf; |
| if (stat(path, &buf)) { |
| die_errno("failed to stat '%*s%s%s'", |
| prefix_len, |
| prefix ? prefix : "", |
| prefix ? "/" : "", path); |
| } |
| return buf.st_dev; |
| } |
| |
| /* |
| * A "string_list_each_func_t" function that canonicalizes an entry |
| * from GIT_CEILING_DIRECTORIES using real_path_if_valid(), or |
| * discards it if unusable. The presence of an empty entry in |
| * GIT_CEILING_DIRECTORIES turns off canonicalization for all |
| * subsequent entries. |
| */ |
| static int canonicalize_ceiling_entry(struct string_list_item *item, |
| void *cb_data) |
| { |
| int *empty_entry_found = cb_data; |
| char *ceil = item->string; |
| |
| if (!*ceil) { |
| *empty_entry_found = 1; |
| return 0; |
| } else if (!is_absolute_path(ceil)) { |
| return 0; |
| } else if (*empty_entry_found) { |
| /* Keep entry but do not canonicalize it */ |
| return 1; |
| } else { |
| const char *real_path = real_path_if_valid(ceil); |
| if (!real_path) |
| return 0; |
| free(item->string); |
| item->string = xstrdup(real_path); |
| return 1; |
| } |
| } |
| |
| /* |
| * 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. |
| */ |
| static const char *setup_git_directory_gently_1(int *nongit_ok) |
| { |
| const char *env_ceiling_dirs = getenv(CEILING_DIRECTORIES_ENVIRONMENT); |
| struct string_list ceiling_dirs = STRING_LIST_INIT_DUP; |
| static char cwd[PATH_MAX+1]; |
| const char *gitdirenv, *ret; |
| char *gitfile; |
| int len, offset, offset_parent, ceil_offset = -1; |
| dev_t current_device = 0; |
| int one_filesystem = 1; |
| |
| /* |
| * 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 (!getcwd(cwd, sizeof(cwd)-1)) |
| die_errno("Unable to read current working directory"); |
| offset = len = strlen(cwd); |
| |
| /* |
| * 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) |
| return setup_explicit_git_dir(gitdirenv, cwd, len, nongit_ok); |
| |
| if (env_ceiling_dirs) { |
| int empty_entry_found = 0; |
| |
| string_list_split(&ceiling_dirs, env_ceiling_dirs, PATH_SEP, -1); |
| filter_string_list(&ceiling_dirs, 0, |
| canonicalize_ceiling_entry, &empty_entry_found); |
| ceil_offset = longest_ancestor_length(cwd, &ceiling_dirs); |
| string_list_clear(&ceiling_dirs, 0); |
| } |
| |
| 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. |
| */ |
| one_filesystem = !git_env_bool("GIT_DISCOVERY_ACROSS_FILESYSTEM", 0); |
| if (one_filesystem) |
| current_device = get_device_or_die(".", NULL, 0); |
| for (;;) { |
| gitfile = (char*)read_gitfile(DEFAULT_GIT_DIR_ENVIRONMENT); |
| if (gitfile) |
| gitdirenv = gitfile = xstrdup(gitfile); |
| else { |
| if (is_git_directory(DEFAULT_GIT_DIR_ENVIRONMENT)) |
| gitdirenv = DEFAULT_GIT_DIR_ENVIRONMENT; |
| } |
| |
| if (gitdirenv) { |
| ret = setup_discovered_git_dir(gitdirenv, |
| cwd, offset, len, |
| nongit_ok); |
| free(gitfile); |
| return ret; |
| } |
| free(gitfile); |
| |
| if (is_git_directory(".")) |
| return setup_bare_git_dir(cwd, offset, len, nongit_ok); |
| |
| offset_parent = offset; |
| while (--offset_parent > ceil_offset && cwd[offset_parent] != '/'); |
| if (offset_parent <= ceil_offset) |
| return setup_nongit(cwd, nongit_ok); |
| if (one_filesystem) { |
| dev_t parent_device = get_device_or_die("..", cwd, offset); |
| if (parent_device != current_device) { |
| if (nongit_ok) { |
| if (chdir(cwd)) |
| die_errno("Cannot come back to cwd"); |
| *nongit_ok = 1; |
| return NULL; |
| } |
| cwd[offset] = '\0'; |
| die("Not a git repository (or any parent up to mount point %s)\n" |
| "Stopping at filesystem boundary (GIT_DISCOVERY_ACROSS_FILESYSTEM not set).", cwd); |
| } |
| } |
| if (chdir("..")) { |
| cwd[offset] = '\0'; |
| die_errno("Cannot change to '%s/..'", cwd); |
| } |
| offset = offset_parent; |
| } |
| } |
| |
| const char *setup_git_directory_gently(int *nongit_ok) |
| { |
| const char *prefix; |
| |
| prefix = setup_git_directory_gently_1(nongit_ok); |
| if (prefix) |
| setenv(GIT_PREFIX_ENVIRONMENT, prefix, 1); |
| else |
| setenv(GIT_PREFIX_ENVIRONMENT, "", 1); |
| |
| if (startup_info) { |
| startup_info->have_repository = !nongit_ok || !*nongit_ok; |
| startup_info->prefix = prefix; |
| } |
| return prefix; |
| } |
| |
| 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(get_git_dir(), NULL); |
| } |
| |
| /* |
| * Returns the "prefix", a path to the current working directory |
| * relative to the work tree root, or NULL, if the current working |
| * directory is not a strict subdirectory of the work tree root. The |
| * prefix always ends with a '/' character. |
| */ |
| const char *setup_git_directory(void) |
| { |
| return setup_git_directory_gently(NULL); |
| } |
| |
| const char *resolve_gitdir(const char *suspect) |
| { |
| if (is_git_directory(suspect)) |
| return suspect; |
| return read_gitfile(suspect); |
| } |
| |
| /* if any standard file descriptor is missing open it to /dev/null */ |
| void sanitize_stdfds(void) |
| { |
| int fd = open("/dev/null", O_RDWR, 0); |
| while (fd != -1 && fd < 2) |
| fd = dup(fd); |
| if (fd == -1) |
| die_errno("open /dev/null or dup failed"); |
| if (fd > 2) |
| close(fd); |
| } |