tests: check that we can delete directories with all permission

Regression test for https://github.com/rfjakob/gocryptfs/issues/354

tests/matrix/dir_test.go

@@ -1,6 +1,7 @@
 package matrix
 
 import (
+	"fmt"
 	"os"
 	"syscall"
 	"testing"
@@ -30,3 +31,20 @@ func TestDirOverwrite(t *testing.T) {
 		t.Fatal(err)
 	}
 }
+
+// Test that we can create and remove a directory regardless of the permission it has
+// https://github.com/rfjakob/gocryptfs/issues/354
+func TestRmdirPerms(t *testing.T) {
+	for _, perm := range []uint32{0000, 0100, 0200, 0300, 0400, 0500, 0600, 0700} {
+		dir := fmt.Sprintf("TestRmdir%#o", perm)
+		path := test_helpers.DefaultPlainDir + "/" + dir
+		err := syscall.Mkdir(path, perm)
+		if err != nil {
+			t.Fatalf("Mkdir %q: %v", dir, err)
+		}
+		err = syscall.Rmdir(path)
+		if err != nil {
+			t.Fatalf("Rmdir %q: %v", dir, err)
+		}
+	}
+}

tests/test_helpers/helpers.go

@@ -227,7 +227,9 @@ func TestMkdirRmdir(t *testing.T, plainDir string) {
 	}
 	err = syscall.Unlink(dir + "/file")
 	if err != nil {
-		t.Error(err)
+		var st syscall.Stat_t
+		syscall.Stat(dir, &st)
+		t.Errorf("err=%v mode=%0o", err, st.Mode)
 		return
 	}
 	err = syscall.Rmdir(dir)