workaround for issue #21

fs/remote.py

@@ -133,6 +133,10 @@ class RemoteFileBuffer(object):
     def truncate(self,size=None):
         self._lock.acquire()
         try:
+            if isinstance(self.file,SpooledTemporaryFile):
+                #  SpooledTemporaryFile.truncate doesn't accept size argument.
+                self.file._file.truncate(size)
+            else:
                 self.file.truncate(size)
             self.flush()
         finally: