Merge branch 'fg/submodule-non-ascii-path'

Many "git submodule" operations do not work on a submodule at a
path whose name is not in ASCII.

* fg/submodule-non-ascii-path:
  t7400: test of UTF-8 submodule names pass under Mac OS
  handle multibyte characters in name

git-submodule.sh

@@ -113,7 +113,7 @@ resolve_relative_url ()
 module_list()
 {
 	(
-		git ls-files --error-unmatch --stage -- "$@" ||
+		git ls-files -z --error-unmatch --stage -- "$@" ||
 		echo "unmatched pathspec exists"
 	) |
 	perl -e '
@@ -121,6 +121,7 @@ module_list()
 	my ($null_sha1) = ("0" x 40);
 	my @out = ();
 	my $unmatched = 0;
+	$/ = "\0";
 	while (<STDIN>) {
 		if (/^unmatched pathspec/) {
 			$unmatched = 1;

t/t7400-submodule-basic.sh

@@ -868,4 +868,19 @@ test_expect_success 'submodule deinit fails when submodule has a .git directory
 	test -n "$(git config --get-regexp "submodule\.example\.")"
 '
 
+test_expect_success 'submodule with UTF-8 name' '
+	svname=$(printf "\303\245 \303\244\303\266") &&
+	mkdir "$svname" &&
+	(
+		cd "$svname" &&
+		git init &&
+		>sub &&
+		git add sub &&
+		git commit -m "init sub"
+	) &&
+	test_config core.precomposeunicode true &&
+	git submodule add ./"$svname" &&
+	git submodule >&2 &&
+	test -n "$(git submodule | grep "$svname")"
+'
 test_done