Bugfix: only add file to GAFileMetadata if not there

1 files changed, 5 insertions, 4 deletions

diff --git a/obnamlib/fmt_ga/client.py b/obnamlib/fmt_ga/client.py
index 19dbadd1..9ee7ff3f 100644
--- a/obnamlib/fmt_ga/client.py
+++ b/obnamlib/fmt_ga/client.py
@@ -417,10 +417,11 @@ class GAFileMetadata(object):
         return filename in self._files
 
     def add_file(self, filename):
-        self._files[filename] = {
-            'keys': {},
-            'chunks': [],
-        }
+        if filename not in self._files:
+            self._files[filename] = {
+                'keys': {},
+                'chunks': [],
+            }
 
     def remove_file(self, filename):
         if filename in self._files: