fix potential python 2 issue

Python 2 checks for __nonzero__(), not __bool__(). roverlay usually relies
explicit checks ("if obj.attr == $expected" or "obj.exists()" rather than
"if object:"), so this is not a major issue.

1 files changed, 6 insertions, 1 deletions

diff --git a/roverlay/overlay/additionsdir.py b/roverlay/overlay/additionsdir.py
index 5e24622..6e795a6 100644
--- a/roverlay/overlay/additionsdir.py
+++ b/roverlay/overlay/additionsdir.py
@@ -24,7 +24,8 @@ class AdditionsDir ( object ):
       return self.root is not None and os.path.isdir ( self.root )
    # --- end of exists (...) ---
 
-   __bool__ = exists
+   __bool__    = exists
+   __nonzero__ = exists
 
    def iter_entries ( self ):
       """Generator that yields the directory content of this dir."""
@@ -95,6 +96,10 @@ class _AdditionsDirView ( object ):
       return bool ( self._additions_dir )
    # --- end of __bool__ (...) ---
 
+   def __nonzero__ ( self ):
+      return self.__bool__()
+   # --- end of __nonzero__ (...) ---
+
    @property
    def name ( self ):
       return self._additions_dir.name