Merge branch 'config-wo-repo'

This branch contains fixes that let `git config` report appropriately
when the user tries to modify a repository config outside of any Git
worktree.

These changes were triggered by the bug report at

	https://github.com/git-for-windows/git/issues/643

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>

builtin/config.c

@@ -352,6 +352,9 @@ static int get_colorbool(const char *var, int print)
 
 static void check_write(void)
 {
+	if (!given_config_source.file && !startup_info->have_repository)
+		die("not in a git directory");
+
 	if (given_config_source.use_stdin)
 		die("writing to stdin is not supported");
 

config.c

@@ -1951,10 +1951,6 @@ static int lock_config_file(const char *config_filename,
 {
 	int fd;
 
-	/* make sure the parent directory exists */
-	if (safe_create_leading_directories_const(config_filename))
-		return error("could not create parent directory of %s",
-				config_filename);
 	*result = xcalloc(1, sizeof(struct lock_file));
 	fd = hold_lock_file_for_update(*result, config_filename, 0);
 	if (fd < 0)

t/t1308-config-set.sh

@@ -218,4 +218,13 @@ test_expect_success 'check line errors for malformed values' '
 	test_i18ngrep "fatal: .*alias\.br.*\.git/config.*line 2" result
 '
 
+test_expect_success 'error on modifying repo config without repo' '
+	mkdir no-repo &&
+	GIT_CEILING_DIRECTORIES=$(pwd) &&
+	export GIT_CEILING_DIRECTORIES &&
+	cd no-repo &&
+	test_must_fail git config a.b c 2>err &&
+	grep "not in a git directory" err
+'
+
 test_done