build-linux and build-gem5 seem to work

copy-overlay

@@ -9,8 +9,8 @@ import common
 class CopyOverlayComponent(common.Component):
     def do_build(self, args):
         distutils.dir_util.copy_tree(
-            common.rootfs_overlay_dir,
-            common.out_rootfs_overlay_dir,
+            kwargs['rootfs_overlay_dir'],
+            kwargs['out_rootfs_overlay_dir'],
             update=1,
         )