UID/GID mapping: Use empty list instead of None

Resolve an issue when only uid_map or only gid_map is specified.

We set the default values to None. However, `len(None)` will raise
an exception. To avoid this we need to set the default values to
[] (empty list).

1 files changed, 6 insertions, 0 deletions

diff --git a/src/virtBootstrap/virt_bootstrap.py b/src/virtBootstrap/virt_bootstrap.py
index 0bc2e2b..f970838 100755
--- a/src/virtBootstrap/virt_bootstrap.py
+++ b/src/virtBootstrap/virt_bootstrap.py
@@ -120,6 +120,12 @@ def bootstrap(uri, dest,
         logger.error("No write permissions on destination path '%s'", dest)
         sys.exit(1)
 
+    if uid_map is None:
+        uid_map = []
+
+    if gid_map is None:
+        gid_map = []
+
     source(uri=uri,
            fmt=fmt,
            username=username,