UpstreamSource: don't use empty list as default argument

since we want to avoid the same list being reused

1 files changed, 2 insertions, 2 deletions

diff --git a/gbp/pkg/__init__.py b/gbp/pkg/__init__.py
index 75975b1c..70bcb21e 100644
--- a/gbp/pkg/__init__.py
+++ b/gbp/pkg/__init__.py
@@ -309,7 +309,7 @@ class UpstreamSource(object):
     def path(self):
         return self._path.rstrip('/')
 
-    def unpack(self, dir, filters=[]):
+    def unpack(self, dir, filters=None):
         """
         Unpack packed upstream sources into a given directory
         (filtering out files specified by filters) and determine the
@@ -368,7 +368,7 @@ class UpstreamSource(object):
             # unpackArchive already printed an error message
             raise GbpError
 
-    def pack(self, newarchive, filters=[]):
+    def pack(self, newarchive, filters=None):
         """
         Recreate a new archive from the current one