The --warn option is not named --warning.

lysrdiff-set-status.py

@@ -36,7 +36,7 @@ if __name__ == '__main__':
     if sys.argv[1] == "--ok":
         completion(int(sys.argv[2]), int(sys.argv[3]), 
 		   sys.argv[4], sys.argv[5], "OK")
-    if sys.argv[1] == "--warning":
+    if sys.argv[1] == "--warn":
         completion(int(sys.argv[2]), int(sys.argv[3]), 
 		   sys.argv[4], sys.argv[5], "WARN")
     if sys.argv[1] == "--fail":