| #include "cache.h" |
| #include "repository.h" |
| #include "config.h" |
| #include "dir.h" |
| #include "string-list.h" |
| #include "chdir-notify.h" |
| |
| static int inside_git_dir = -1; |
| static int inside_work_tree = -1; |
| static int work_tree_config_is_bogus; |
| |
| static struct startup_info the_startup_info; |
| struct startup_info *startup_info = &the_startup_info; |
| |
| /* |
| * The input parameter must contain an absolute path, and it must already be |
| * normalized. |
| * |
| * Find the part of an absolute path that lies inside the work tree by |
| * dereferencing symlinks outside the work tree, for example: |
| * /dir1/repo/dir2/file (work tree is /dir1/repo) -> dir2/file |
| * /dir/file (work tree is /) -> dir/file |
| * /dir/symlink1/symlink2 (symlink1 points to work tree) -> symlink2 |
| * /dir/repolink/file (repolink points to /dir/repo) -> file |
| * /dir/repo (exactly equal to work tree) -> (empty string) |
| */ |
| static int abspath_part_inside_repo(char *path) |
| { |
| size_t len; |
| size_t wtlen; |
| char *path0; |
| int off; |
| const char *work_tree = get_git_work_tree(); |
| |
| if (!work_tree) |
| return -1; |
| wtlen = strlen(work_tree); |
| len = strlen(path); |
| off = offset_1st_component(path); |
| |
| /* check if work tree is already the prefix */ |
| if (wtlen <= len && !strncmp(path, work_tree, wtlen)) { |
| if (path[wtlen] == '/') { |
| memmove(path, path + wtlen + 1, len - wtlen); |
| return 0; |
| } else if (path[wtlen - 1] == '/' || path[wtlen] == '\0') { |
| /* work tree is the root, or the whole path */ |
| memmove(path, path + wtlen, len - wtlen + 1); |
| return 0; |
| } |
| /* work tree might match beginning of a symlink to work tree */ |
| off = wtlen; |
| } |
| path0 = path; |
| path += off; |
| |
| /* check each '/'-terminated level */ |
| while (*path) { |
| path++; |
| if (*path == '/') { |
| *path = '\0'; |
| if (strcmp(real_path(path0), work_tree) == 0) { |
| memmove(path0, path + 1, len - (path - path0)); |
| return 0; |
| } |
| *path = '/'; |
| } |
| } |
| |
| /* check whole path */ |
| if (strcmp(real_path(path0), work_tree) == 0) { |
| *path0 = '\0'; |
| return 0; |
| } |
| |
| return -1; |
| } |
| |
| /* |
| * Normalize "path", prepending the "prefix" for relative paths. If |
| * remaining_prefix is not NULL, return the actual prefix still |
| * remains in the path. For example, prefix = sub1/sub2/ and path is |
| * |
| * foo -> sub1/sub2/foo (full prefix) |
| * ../foo -> sub1/foo (remaining prefix is sub1/) |
| * ../../bar -> bar (no remaining prefix) |
| * ../../sub1/sub2/foo -> sub1/sub2/foo (but no remaining prefix) |
| * `pwd`/../bar -> sub1/bar (no remaining prefix) |
| */ |
| char *prefix_path_gently(const char *prefix, int len, |
| int *remaining_prefix, const char *path) |
| { |
| const char *orig = path; |
| char *sanitized; |
| if (is_absolute_path(orig)) { |
| sanitized = xmallocz(strlen(path)); |
| if (remaining_prefix) |
| *remaining_prefix = 0; |
| if (normalize_path_copy_len(sanitized, path, remaining_prefix)) { |
| free(sanitized); |
| return NULL; |
| } |
| if (abspath_part_inside_repo(sanitized)) { |
| free(sanitized); |
| return NULL; |
| } |
| } else { |
| sanitized = xstrfmt("%.*s%s", len, len ? prefix : "", path); |
| if (remaining_prefix) |
| *remaining_prefix = len; |
| if (normalize_path_copy_len(sanitized, sanitized, remaining_prefix)) { |
| free(sanitized); |
| return NULL; |
| } |
| } |
| return sanitized; |
| } |
| |
| char *prefix_path(const char *prefix, int len, const char *path) |
| { |
| char *r = prefix_path_gently(prefix, len, NULL, 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, NULL, path); |
| if (r) { |
| free(r); |
| return 1; |
| } |
| return 0; |
| } |
| |
| int check_filename(const char *prefix, const char *arg) |
| { |
| char *to_free = NULL; |
| struct stat st; |
| |
| if (skip_prefix(arg, ":/", &arg)) { |
| if (!*arg) /* ":/" is root dir, always exists */ |
| return 1; |
| prefix = NULL; |
| } else if (skip_prefix(arg, ":!", &arg) || |
| skip_prefix(arg, ":^", &arg)) { |
| if (!*arg) /* excluding everything is silly, but allowed */ |
| return 1; |
| } |
| |
| if (prefix) |
| arg = to_free = prefix_filename(prefix, arg); |
| |
| if (!lstat(arg, &st)) { |
| free(to_free); |
| return 1; /* file exists */ |
| } |
| if (is_missing_file_error(errno)) { |
| free(to_free); |
| 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); |
| |
| } |
| |
| /* |
| * Check for arguments that don't resolve as actual files, |
| * but which look sufficiently like pathspecs that we'll consider |
| * them such for the purposes of rev/pathspec DWIM parsing. |
| */ |
| static int looks_like_pathspec(const char *arg) |
| { |
| /* anything with a wildcard character */ |
| if (!no_wildcard(arg)) |
| return 1; |
| |
| /* long-form pathspec magic */ |
| if (starts_with(arg, ":(")) |
| return 1; |
| |
| return 0; |
| } |
| |
| /* |
| * 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(_("option '%s' must come before non-option arguments"), arg); |
| if (looks_like_pathspec(arg) || 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); |
| } |
| |
| int get_common_dir(struct strbuf *sb, const char *gitdir) |
| { |
| const char *git_env_common_dir = getenv(GIT_COMMON_DIR_ENVIRONMENT); |
| if (git_env_common_dir) { |
| strbuf_addstr(sb, git_env_common_dir); |
| return 1; |
| } else { |
| return get_common_dir_noenv(sb, gitdir); |
| } |
| } |
| |
| int get_common_dir_noenv(struct strbuf *sb, const char *gitdir) |
| { |
| struct strbuf data = STRBUF_INIT; |
| struct strbuf path = STRBUF_INIT; |
| int ret = 0; |
| |
| strbuf_addf(&path, "%s/commondir", gitdir); |
| if (file_exists(path.buf)) { |
| if (strbuf_read_file(&data, path.buf, 0) <= 0) |
| die_errno(_("failed to read %s"), path.buf); |
| while (data.len && (data.buf[data.len - 1] == '\n' || |
| data.buf[data.len - 1] == '\r')) |
| data.len--; |
| data.buf[data.len] = '\0'; |
| strbuf_reset(&path); |
| if (!is_absolute_path(data.buf)) |
| strbuf_addf(&path, "%s/", gitdir); |
| strbuf_addbuf(&path, &data); |
| strbuf_add_real_path(sb, path.buf); |
| ret = 1; |
| } else { |
| strbuf_addstr(sb, gitdir); |
| } |
| |
| strbuf_release(&data); |
| strbuf_release(&path); |
| return ret; |
| } |
| |
| /* |
| * 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) |
| { |
| struct strbuf path = STRBUF_INIT; |
| int ret = 0; |
| size_t len; |
| |
| /* Check worktree-related signatures */ |
| strbuf_addstr(&path, suspect); |
| strbuf_complete(&path, '/'); |
| strbuf_addstr(&path, "HEAD"); |
| if (validate_headref(path.buf)) |
| goto done; |
| |
| strbuf_reset(&path); |
| get_common_dir(&path, suspect); |
| len = path.len; |
| |
| /* Check non-worktree-related signatures */ |
| if (getenv(DB_ENVIRONMENT)) { |
| if (access(getenv(DB_ENVIRONMENT), X_OK)) |
| goto done; |
| } |
| else { |
| strbuf_setlen(&path, len); |
| strbuf_addstr(&path, "/objects"); |
| if (access(path.buf, X_OK)) |
| goto done; |
| } |
| |
| strbuf_setlen(&path, len); |
| strbuf_addstr(&path, "/refs"); |
| if (access(path.buf, X_OK)) |
| goto done; |
| |
| ret = 1; |
| done: |
| strbuf_release(&path); |
| return ret; |
| } |
| |
| int is_nonbare_repository_dir(struct strbuf *path) |
| { |
| int ret = 0; |
| int gitfile_error; |
| size_t orig_path_len = path->len; |
| assert(orig_path_len != 0); |
| strbuf_complete(path, '/'); |
| strbuf_addstr(path, ".git"); |
| if (read_gitfile_gently(path->buf, &gitfile_error) || is_git_directory(path->buf)) |
| ret = 1; |
| if (gitfile_error == READ_GITFILE_ERR_OPEN_FAILED || |
| gitfile_error == READ_GITFILE_ERR_READ_FAILED) |
| ret = 1; |
| strbuf_setlen(path, orig_path_len); |
| return ret; |
| } |
| |
| 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) |
| { |
| const char *work_tree; |
| static int initialized = 0; |
| |
| if (initialized) |
| return; |
| |
| if (work_tree_config_is_bogus) |
| die(_("unable to set up work tree using invalid config")); |
| |
| work_tree = get_git_work_tree(); |
| if (!work_tree || chdir_notify(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); |
| |
| initialized = 1; |
| } |
| |
| static int check_repo_format(const char *var, const char *value, void *vdata) |
| { |
| struct repository_format *data = vdata; |
| const char *ext; |
| |
| if (strcmp(var, "core.repositoryformatversion") == 0) |
| data->version = git_config_int(var, value); |
| else if (skip_prefix(var, "extensions.", &ext)) { |
| /* |
| * record any known extensions here; otherwise, |
| * we fall through to recording it as unknown, and |
| * check_repository_format will complain |
| */ |
| if (!strcmp(ext, "noop")) |
| ; |
| else if (!strcmp(ext, "preciousobjects")) |
| data->precious_objects = git_config_bool(var, value); |
| else if (!strcmp(ext, "partialclone")) { |
| if (!value) |
| return config_error_nonbool(var); |
| data->partial_clone = xstrdup(value); |
| } else |
| string_list_append(&data->unknown_extensions, ext); |
| } else if (strcmp(var, "core.bare") == 0) { |
| data->is_bare = git_config_bool(var, value); |
| } else if (strcmp(var, "core.worktree") == 0) { |
| if (!value) |
| return config_error_nonbool(var); |
| data->work_tree = xstrdup(value); |
| } |
| return 0; |
| } |
| |
| static int check_repository_format_gently(const char *gitdir, struct repository_format *candidate, int *nongit_ok) |
| { |
| struct strbuf sb = STRBUF_INIT; |
| struct strbuf err = STRBUF_INIT; |
| int has_common; |
| |
| has_common = get_common_dir(&sb, gitdir); |
| strbuf_addstr(&sb, "/config"); |
| read_repository_format(candidate, sb.buf); |
| strbuf_release(&sb); |
| |
| /* |
| * For historical use of check_repository_format() in git-init, |
| * we treat a missing config as a silent "ok", even when nongit_ok |
| * is unset. |
| */ |
| if (candidate->version < 0) |
| return 0; |
| |
| if (verify_repository_format(candidate, &err) < 0) { |
| if (nongit_ok) { |
| warning("%s", err.buf); |
| strbuf_release(&err); |
| *nongit_ok = -1; |
| return -1; |
| } |
| die("%s", err.buf); |
| } |
| |
| repository_format_precious_objects = candidate->precious_objects; |
| repository_format_partial_clone = candidate->partial_clone; |
| string_list_clear(&candidate->unknown_extensions, 0); |
| if (!has_common) { |
| if (candidate->is_bare != -1) { |
| is_bare_repository_cfg = candidate->is_bare; |
| if (is_bare_repository_cfg == 1) |
| inside_work_tree = -1; |
| } |
| if (candidate->work_tree) { |
| free(git_work_tree_cfg); |
| git_work_tree_cfg = candidate->work_tree; |
| inside_work_tree = -1; |
| } |
| } else { |
| free(candidate->work_tree); |
| } |
| |
| return 0; |
| } |
| |
| int read_repository_format(struct repository_format *format, const char *path) |
| { |
| memset(format, 0, sizeof(*format)); |
| format->version = -1; |
| format->is_bare = -1; |
| format->hash_algo = GIT_HASH_SHA1; |
| string_list_init(&format->unknown_extensions, 1); |
| git_config_from_file(check_repo_format, path, format); |
| return format->version; |
| } |
| |
| int verify_repository_format(const struct repository_format *format, |
| struct strbuf *err) |
| { |
| if (GIT_REPO_VERSION_READ < format->version) { |
| strbuf_addf(err, _("Expected git repo version <= %d, found %d"), |
| GIT_REPO_VERSION_READ, format->version); |
| return -1; |
| } |
| |
| if (format->version >= 1 && format->unknown_extensions.nr) { |
| int i; |
| |
| strbuf_addstr(err, _("unknown repository extensions found:")); |
| |
| for (i = 0; i < format->unknown_extensions.nr; i++) |
| strbuf_addf(err, "\n\t%s", |
| format->unknown_extensions.items[i].string); |
| return -1; |
| } |
| |
| return 0; |
| } |
| |
| void read_gitfile_error_die(int error_code, const char *path, const char *dir) |
| { |
| switch (error_code) { |
| case READ_GITFILE_ERR_STAT_FAILED: |
| case READ_GITFILE_ERR_NOT_A_FILE: |
| /* non-fatal; follow return path */ |
| break; |
| case READ_GITFILE_ERR_OPEN_FAILED: |
| die_errno(_("error opening '%s'"), path); |
| case READ_GITFILE_ERR_TOO_LARGE: |
| die(_("too large to be a .git file: '%s'"), path); |
| case READ_GITFILE_ERR_READ_FAILED: |
| die(_("error reading %s"), path); |
| case READ_GITFILE_ERR_INVALID_FORMAT: |
| die(_("invalid gitfile format: %s"), path); |
| case READ_GITFILE_ERR_NO_PATH: |
| die(_("no path in gitfile: %s"), path); |
| case READ_GITFILE_ERR_NOT_A_REPO: |
| die(_("not a git repository: %s"), dir); |
| default: |
| BUG("unknown error code"); |
| } |
| } |
| |
| /* |
| * Try to read the location of the git directory from the .git file, |
| * return path to git directory if found. The return value comes from |
| * a shared buffer. |
| * |
| * On failure, if return_error_code is not NULL, return_error_code |
| * will be set to an error code and NULL will be returned. If |
| * return_error_code is NULL the function will die instead (for most |
| * cases). |
| */ |
| const char *read_gitfile_gently(const char *path, int *return_error_code) |
| { |
| const int max_file_size = 1 << 20; /* 1MB */ |
| int error_code = 0; |
| char *buf = NULL; |
| char *dir = NULL; |
| const char *slash; |
| struct stat st; |
| int fd; |
| ssize_t len; |
| |
| if (stat(path, &st)) { |
| /* NEEDSWORK: discern between ENOENT vs other errors */ |
| error_code = READ_GITFILE_ERR_STAT_FAILED; |
| goto cleanup_return; |
| } |
| if (!S_ISREG(st.st_mode)) { |
| error_code = READ_GITFILE_ERR_NOT_A_FILE; |
| goto cleanup_return; |
| } |
| if (st.st_size > max_file_size) { |
| error_code = READ_GITFILE_ERR_TOO_LARGE; |
| goto cleanup_return; |
| } |
| fd = open(path, O_RDONLY); |
| if (fd < 0) { |
| error_code = READ_GITFILE_ERR_OPEN_FAILED; |
| goto cleanup_return; |
| } |
| buf = xmallocz(st.st_size); |
| len = read_in_full(fd, buf, st.st_size); |
| close(fd); |
| if (len != st.st_size) { |
| error_code = READ_GITFILE_ERR_READ_FAILED; |
| goto cleanup_return; |
| } |
| if (!starts_with(buf, "gitdir: ")) { |
| error_code = READ_GITFILE_ERR_INVALID_FORMAT; |
| goto cleanup_return; |
| } |
| while (buf[len - 1] == '\n' || buf[len - 1] == '\r') |
| len--; |
| if (len < 9) { |
| error_code = READ_GITFILE_ERR_NO_PATH; |
| goto cleanup_return; |
| } |
| buf[len] = '\0'; |
| dir = buf + 8; |
| |
| if (!is_absolute_path(dir) && (slash = strrchr(path, '/'))) { |
| size_t pathlen = slash+1 - path; |
| dir = xstrfmt("%.*s%.*s", (int)pathlen, path, |
| (int)(len - 8), buf + 8); |
| free(buf); |
| buf = dir; |
| } |
| if (!is_git_directory(dir)) { |
| error_code = READ_GITFILE_ERR_NOT_A_REPO; |
| goto cleanup_return; |
| } |
| path = real_path(dir); |
| |
| cleanup_return: |
| if (return_error_code) |
| *return_error_code = error_code; |
| else if (error_code) |
| read_gitfile_error_die(error_code, path, dir); |
| |
| free(buf); |
| return error_code ? NULL : path; |
| } |
| |
| static const char *setup_explicit_git_dir(const char *gitdirenv, |
| struct strbuf *cwd, |
| struct repository_format *repo_fmt, |
| 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, repo_fmt, 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 */ |
| warning("core.bare and core.worktree do not make sense"); |
| work_tree_config_is_bogus = 1; |
| } |
| |
| /* #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; |
| if (chdir(gitdirenv)) |
| die_errno(_("cannot chdir to '%s'"), gitdirenv); |
| if (chdir(git_work_tree_cfg)) |
| die_errno(_("cannot chdir to '%s'"), git_work_tree_cfg); |
| core_worktree = xgetcwd(); |
| if (chdir(cwd->buf)) |
| die_errno(_("cannot come back to cwd")); |
| set_git_work_tree(core_worktree); |
| free(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->buf, worktree)) { /* cwd == worktree */ |
| set_git_dir(gitdirenv); |
| free(gitfile); |
| return NULL; |
| } |
| |
| offset = dir_inside_of(cwd->buf, worktree); |
| if (offset >= 0) { /* cwd inside worktree? */ |
| set_git_dir(real_path(gitdirenv)); |
| if (chdir(worktree)) |
| die_errno(_("cannot chdir to '%s'"), worktree); |
| strbuf_addch(cwd, '/'); |
| free(gitfile); |
| return cwd->buf + offset; |
| } |
| |
| /* cwd outside worktree */ |
| set_git_dir(gitdirenv); |
| free(gitfile); |
| return NULL; |
| } |
| |
| static const char *setup_discovered_git_dir(const char *gitdir, |
| struct strbuf *cwd, int offset, |
| struct repository_format *repo_fmt, |
| int *nongit_ok) |
| { |
| if (check_repository_format_gently(gitdir, repo_fmt, nongit_ok)) |
| return NULL; |
| |
| /* --work-tree is set without --git-dir; use discovered one */ |
| if (getenv(GIT_WORK_TREE_ENVIRONMENT) || git_work_tree_cfg) { |
| char *to_free = NULL; |
| const char *ret; |
| |
| if (offset != cwd->len && !is_absolute_path(gitdir)) |
| gitdir = to_free = real_pathdup(gitdir, 1); |
| if (chdir(cwd->buf)) |
| die_errno(_("cannot come back to cwd")); |
| ret = setup_explicit_git_dir(gitdir, cwd, repo_fmt, nongit_ok); |
| free(to_free); |
| return ret; |
| } |
| |
| /* #16.2, #17.2, #20.2, #21.2, #24, #25, #28, #29 (see t1510) */ |
| if (is_bare_repository_cfg > 0) { |
| set_git_dir(offset == cwd->len ? gitdir : real_path(gitdir)); |
| if (chdir(cwd->buf)) |
| die_errno(_("cannot 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 == cwd->len) |
| return NULL; |
| |
| /* Make "offset" point past the '/' (already the case for root dirs) */ |
| if (offset != offset_1st_component(cwd->buf)) |
| offset++; |
| /* Add a '/' at the end */ |
| strbuf_addch(cwd, '/'); |
| return cwd->buf + offset; |
| } |
| |
| /* #16.1, #17.1, #20.1, #21.1, #22.1 (see t1510) */ |
| static const char *setup_bare_git_dir(struct strbuf *cwd, int offset, |
| struct repository_format *repo_fmt, |
| int *nongit_ok) |
| { |
| int root_len; |
| |
| if (check_repository_format_gently(".", repo_fmt, 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) { |
| static const char *gitdir; |
| |
| gitdir = offset == cwd->len ? "." : xmemdupz(cwd->buf, offset); |
| if (chdir(cwd->buf)) |
| die_errno(_("cannot come back to cwd")); |
| return setup_explicit_git_dir(gitdir, cwd, repo_fmt, nongit_ok); |
| } |
| |
| inside_git_dir = 1; |
| inside_work_tree = 0; |
| if (offset != cwd->len) { |
| if (chdir(cwd->buf)) |
| die_errno(_("cannot come back to cwd")); |
| root_len = offset_1st_component(cwd->buf); |
| strbuf_setlen(cwd, offset > root_len ? offset : root_len); |
| set_git_dir(cwd->buf); |
| } |
| 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 { |
| char *real_path = real_pathdup(ceil, 0); |
| if (!real_path) { |
| return 0; |
| } |
| free(item->string); |
| item->string = real_path; |
| return 1; |
| } |
| } |
| |
| enum discovery_result { |
| GIT_DIR_NONE = 0, |
| GIT_DIR_EXPLICIT, |
| GIT_DIR_DISCOVERED, |
| GIT_DIR_BARE, |
| /* these are errors */ |
| GIT_DIR_HIT_CEILING = -1, |
| GIT_DIR_HIT_MOUNT_POINT = -2, |
| GIT_DIR_INVALID_GITFILE = -3 |
| }; |
| |
| /* |
| * 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. |
| * |
| * Also, we avoid changing any global state (such as the current working |
| * directory) to allow early callers. |
| * |
| * The directory where the search should start needs to be passed in via the |
| * `dir` parameter; upon return, the `dir` buffer will contain the path of |
| * the directory where the search ended, and `gitdir` will contain the path of |
| * the discovered .git/ directory, if any. If `gitdir` is not absolute, it |
| * is relative to `dir` (i.e. *not* necessarily the cwd). |
| */ |
| static enum discovery_result setup_git_directory_gently_1(struct strbuf *dir, |
| struct strbuf *gitdir, |
| int die_on_error) |
| { |
| const char *env_ceiling_dirs = getenv(CEILING_DIRECTORIES_ENVIRONMENT); |
| struct string_list ceiling_dirs = STRING_LIST_INIT_DUP; |
| const char *gitdirenv; |
| int ceil_offset = -1, min_offset = has_dos_drive_prefix(dir->buf) ? 3 : 1; |
| dev_t current_device = 0; |
| int one_filesystem = 1; |
| |
| /* |
| * 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) { |
| strbuf_addstr(gitdir, gitdirenv); |
| return GIT_DIR_EXPLICIT; |
| } |
| |
| 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(dir->buf, &ceiling_dirs); |
| string_list_clear(&ceiling_dirs, 0); |
| } |
| |
| if (ceil_offset < 0) |
| ceil_offset = min_offset - 2; |
| |
| /* |
| * Test in the following order (relative to the dir): |
| * - .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(dir->buf, NULL, 0); |
| for (;;) { |
| int offset = dir->len, error_code = 0; |
| |
| if (offset > min_offset) |
| strbuf_addch(dir, '/'); |
| strbuf_addstr(dir, DEFAULT_GIT_DIR_ENVIRONMENT); |
| gitdirenv = read_gitfile_gently(dir->buf, die_on_error ? |
| NULL : &error_code); |
| if (!gitdirenv) { |
| if (die_on_error || |
| error_code == READ_GITFILE_ERR_NOT_A_FILE) { |
| /* NEEDSWORK: fail if .git is not file nor dir */ |
| if (is_git_directory(dir->buf)) |
| gitdirenv = DEFAULT_GIT_DIR_ENVIRONMENT; |
| } else if (error_code != READ_GITFILE_ERR_STAT_FAILED) |
| return GIT_DIR_INVALID_GITFILE; |
| } |
| strbuf_setlen(dir, offset); |
| if (gitdirenv) { |
| strbuf_addstr(gitdir, gitdirenv); |
| return GIT_DIR_DISCOVERED; |
| } |
| |
| if (is_git_directory(dir->buf)) { |
| strbuf_addstr(gitdir, "."); |
| return GIT_DIR_BARE; |
| } |
| |
| if (offset <= min_offset) |
| return GIT_DIR_HIT_CEILING; |
| |
| while (--offset > ceil_offset && !is_dir_sep(dir->buf[offset])) |
| ; /* continue */ |
| if (offset <= ceil_offset) |
| return GIT_DIR_HIT_CEILING; |
| |
| strbuf_setlen(dir, offset > min_offset ? offset : min_offset); |
| if (one_filesystem && |
| current_device != get_device_or_die(dir->buf, NULL, offset)) |
| return GIT_DIR_HIT_MOUNT_POINT; |
| } |
| } |
| |
| int discover_git_directory(struct strbuf *commondir, |
| struct strbuf *gitdir) |
| { |
| struct strbuf dir = STRBUF_INIT, err = STRBUF_INIT; |
| size_t gitdir_offset = gitdir->len, cwd_len; |
| size_t commondir_offset = commondir->len; |
| struct repository_format candidate; |
| |
| if (strbuf_getcwd(&dir)) |
| return -1; |
| |
| cwd_len = dir.len; |
| if (setup_git_directory_gently_1(&dir, gitdir, 0) <= 0) { |
| strbuf_release(&dir); |
| return -1; |
| } |
| |
| /* |
| * The returned gitdir is relative to dir, and if dir does not reflect |
| * the current working directory, we simply make the gitdir absolute. |
| */ |
| if (dir.len < cwd_len && !is_absolute_path(gitdir->buf + gitdir_offset)) { |
| /* Avoid a trailing "/." */ |
| if (!strcmp(".", gitdir->buf + gitdir_offset)) |
| strbuf_setlen(gitdir, gitdir_offset); |
| else |
| strbuf_addch(&dir, '/'); |
| strbuf_insert(gitdir, gitdir_offset, dir.buf, dir.len); |
| } |
| |
| get_common_dir(commondir, gitdir->buf + gitdir_offset); |
| |
| strbuf_reset(&dir); |
| strbuf_addf(&dir, "%s/config", commondir->buf + commondir_offset); |
| read_repository_format(&candidate, dir.buf); |
| strbuf_release(&dir); |
| |
| if (verify_repository_format(&candidate, &err) < 0) { |
| warning("ignoring git dir '%s': %s", |
| gitdir->buf + gitdir_offset, err.buf); |
| strbuf_release(&err); |
| strbuf_setlen(commondir, commondir_offset); |
| strbuf_setlen(gitdir, gitdir_offset); |
| return -1; |
| } |
| |
| return 0; |
| } |
| |
| const char *setup_git_directory_gently(int *nongit_ok) |
| { |
| static struct strbuf cwd = STRBUF_INIT; |
| struct strbuf dir = STRBUF_INIT, gitdir = STRBUF_INIT; |
| const char *prefix; |
| struct repository_format repo_fmt; |
| |
| /* |
| * We may have read an incomplete configuration before |
| * setting-up the git directory. If so, clear the cache so |
| * that the next queries to the configuration reload complete |
| * configuration (including the per-repo config file that we |
| * ignored previously). |
| */ |
| git_config_clear(); |
| |
| /* |
| * 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 (strbuf_getcwd(&cwd)) |
| die_errno(_("Unable to read current working directory")); |
| strbuf_addbuf(&dir, &cwd); |
| |
| switch (setup_git_directory_gently_1(&dir, &gitdir, 1)) { |
| case GIT_DIR_NONE: |
| prefix = NULL; |
| break; |
| case GIT_DIR_EXPLICIT: |
| prefix = setup_explicit_git_dir(gitdir.buf, &cwd, &repo_fmt, nongit_ok); |
| break; |
| case GIT_DIR_DISCOVERED: |
| if (dir.len < cwd.len && chdir(dir.buf)) |
| die(_("cannot change to '%s'"), dir.buf); |
| prefix = setup_discovered_git_dir(gitdir.buf, &cwd, dir.len, |
| &repo_fmt, nongit_ok); |
| break; |
| case GIT_DIR_BARE: |
| if (dir.len < cwd.len && chdir(dir.buf)) |
| die(_("cannot change to '%s'"), dir.buf); |
| prefix = setup_bare_git_dir(&cwd, dir.len, &repo_fmt, nongit_ok); |
| break; |
| case GIT_DIR_HIT_CEILING: |
| prefix = setup_nongit(cwd.buf, nongit_ok); |
| break; |
| case GIT_DIR_HIT_MOUNT_POINT: |
| if (nongit_ok) { |
| *nongit_ok = 1; |
| strbuf_release(&cwd); |
| strbuf_release(&dir); |
| return NULL; |
| } |
| die(_("not a git repository (or any parent up to mount point %s)\n" |
| "Stopping at filesystem boundary (GIT_DISCOVERY_ACROSS_FILESYSTEM not set)."), |
| dir.buf); |
| default: |
| BUG("unhandled setup_git_directory_1() result"); |
| } |
| |
| if (prefix) |
| setenv(GIT_PREFIX_ENVIRONMENT, prefix, 1); |
| else |
| setenv(GIT_PREFIX_ENVIRONMENT, "", 1); |
| |
| startup_info->have_repository = !nongit_ok || !*nongit_ok; |
| startup_info->prefix = prefix; |
| |
| /* |
| * Not all paths through the setup code will call 'set_git_dir()' (which |
| * directly sets up the environment) so in order to guarantee that the |
| * environment is in a consistent state after setup, explicitly setup |
| * the environment if we have a repository. |
| * |
| * NEEDSWORK: currently we allow bogus GIT_DIR values to be set in some |
| * code paths so we also need to explicitly setup the environment if |
| * the user has set GIT_DIR. It may be beneficial to disallow bogus |
| * GIT_DIR values at some point in the future. |
| */ |
| if (startup_info->have_repository || getenv(GIT_DIR_ENVIRONMENT)) { |
| if (!the_repository->gitdir) { |
| const char *gitdir = getenv(GIT_DIR_ENVIRONMENT); |
| if (!gitdir) |
| gitdir = DEFAULT_GIT_DIR_ENVIRONMENT; |
| setup_git_env(gitdir); |
| } |
| if (startup_info->have_repository) |
| repo_set_hash_algo(the_repository, repo_fmt.hash_algo); |
| } |
| |
| strbuf_release(&dir); |
| strbuf_release(&gitdir); |
| |
| 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); |
| } |
| |
| void check_repository_format(void) |
| { |
| struct repository_format repo_fmt; |
| check_repository_format_gently(get_git_dir(), &repo_fmt, NULL); |
| startup_info->have_repository = 1; |
| } |
| |
| /* |
| * 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_gently(const char *suspect, int *return_error_code) |
| { |
| if (is_git_directory(suspect)) |
| return suspect; |
| return read_gitfile_gently(suspect, return_error_code); |
| } |
| |
| /* 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); |
| } |
| |
| int daemonize(void) |
| { |
| #ifdef NO_POSIX_GOODIES |
| errno = ENOSYS; |
| return -1; |
| #else |
| switch (fork()) { |
| case 0: |
| break; |
| case -1: |
| die_errno(_("fork failed")); |
| default: |
| exit(0); |
| } |
| if (setsid() == -1) |
| die_errno(_("setsid failed")); |
| close(0); |
| close(1); |
| close(2); |
| sanitize_stdfds(); |
| return 0; |
| #endif |
| } |