[storages] Skip already consumed keys in upload postcommit event

cubicweb_s3storage/storages.py

@@ -186,7 +186,11 @@ class S3AddFileOp(DataOperationMixIn, LateOperation):
     containercls = list
 
     def postcommit_event(self):
+        consumed_keys = set()
         for storage, key, eid, attr in self.get_data():
+            if key in consumed_keys:
+                continue
+            consumed_keys.add(key)
             suffixed_key = storage.suffixed_key(key)
             storage.s3cnx.copy_object(
                 Bucket=storage.bucket,