fs use binary (um)marshaler

pkg/repo/fs/fs_test.go

@@ -58,7 +58,8 @@ func TestWrite(t *testing.T) {
 		{path: "/" + dirName, err: "wrong type"},
 	} {
 		t.Run(tc.path, func(t *testing.T) {
-			err = fs.Write(tc.path, []byte{0, 1, 2, 3})
+			sd := &sampleData{[]byte{0, 1, 2, 3}}
+			err = fs.Write(tc.path, sd)
 			if tc.err == "" {
 				if err != nil {
 					assert.Fail(t, "not expecting an error", "write to file %s: %s", tc.path, err)
@@ -122,7 +123,8 @@ func TestRead(t *testing.T) {
 					}
 				}()
 			}
-			_, err = fs.Read(tc.path)
+			sd := new(sampleData)
+			err = fs.Read(tc.path, sd)
 			if tc.err == "" {
 				if err != nil {
 					assert.Fail(t, "read: not expecting an error, got: "+err.Error())
@@ -147,7 +149,8 @@ func TestWriteErrorWithoutLock(t *testing.T) {
 	defer cleanup()
 	fs, err := NewFileStorage(root)
 	assert.NoError(t, err, "create file storage")
-	err = fs.Write("some/path", []byte{0, 1, 2, 3})
+	sd := &sampleData{[]byte{0, 1, 2, 3}}
+	err = fs.Write("some/path", sd)
 	assert.Error(t, err, "should return error when no lock acquired")
 	assert.True(t, strings.Contains(err.Error(), "lock must be acquired"), "should return missing lock error")
 }