fusefrontend: fix chown on dangling symlinks

We (actually, go-fuse) used to call Chown() instead of Lchown()
which meant that the operation would fail on dangling symlinks.

Fix this by calling os.Lchown() ourself. Also add a test case
for this.

1 files changed, 16 insertions, 0 deletions

diff --git a/tests/integration_tests/main_test.go b/tests/integration_tests/main_test.go
index b6cb8ca..17f9d9d 100644
--- a/tests/integration_tests/main_test.go
+++ b/tests/integration_tests/main_test.go
@@ -437,3 +437,19 @@ func TestLongNames(t *testing.T) {
 		t.Errorf("Leftover files, cnt1=%d cnt2=%d", cnt1, cnt2)
 	}
 }
+
+func TestLchown(t *testing.T) {
+	name := test_helpers.DefaultPlainDir + "symlink"
+	err := os.Symlink("/target/does/not/exist", name)
+	if err != nil {
+		t.Fatal(err)
+	}
+	err = os.Chown(name, os.Getuid(), os.Getgid())
+	if err == nil {
+		t.Error("Chown on dangling symlink should fail")
+	}
+	err = os.Lchown(name, os.Getuid(), os.Getgid())
+	if err != nil {
+		t.Error(err)
+	}
+}