Fix file deletion skipping

test/test_streamlayerformat.py

@@ -40,9 +40,10 @@ class TestStreamLayerMerger(unittest.TestCase):
     with tarfile.open(fileobj=StringIO(squashed), mode='r:*') as tar:
       try:
         member = tar.getmember(filename)
-        self.fail('Filename %s found' % filename)
-      except:
-        pass    
+      except Exception as ex:
+        return
+
+      self.fail('Filename %s found' % filename)
 
   def test_single_layer(self):
     tar_layer = self.create_layer(
@@ -122,11 +123,11 @@ class TestStreamLayerMerger(unittest.TestCase):
 
   def test_deleted_in_lower_layer(self):
     third_layer = self.create_layer(
-      another_file = 'bar')
+      deleted_file = 'bar')
 
     second_layer = self.create_layer(
       some_file = 'foo',
-      another_file = None,
+      deleted_file = None,
       third_file = 'meh')
 
     first_layer = self.create_layer(
@@ -137,7 +138,9 @@ class TestStreamLayerMerger(unittest.TestCase):
     self.assertHasFile(squashed, 'some_file', 'foo')
     self.assertHasFile(squashed, 'third_file', 'meh')
     self.assertHasFile(squashed, 'top_file', 'top')
-    self.assertDoesNotHaveFile(squashed, 'another_file')
+    self.assertDoesNotHaveFile(squashed, 'deleted_file')
+
+
 
 if __name__ == '__main__':
   unittest.main()

util/aufs.py

@@ -28,4 +28,7 @@ def get_deleted_prefix(filepath):
     return None
 
   dirname = os.path.dirname(filepath)
+  if not dirname:
+    return deleted_filename
+
   return os.path.join('/', dirname, deleted_filename)