From 0c73ebfa98f80ef676fb2c057c922a14ea3fd81e Mon Sep 17 00:00:00 2001
From: Martin Pitt <martin.pitt@canonical.com>
Date: Fri, 18 Dec 2015 16:37:23 +0100
Subject: [PATCH] Skip second-stage upgrade testing if UPGRADE_OUTPUT option is
 absent or empty

This is useful to speed up britney in dry run mode, if we are only interested
in builds and package tests.
---
 britney.py | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/britney.py b/britney.py
index 58fca8f..ff62ed2 100755
--- a/britney.py
+++ b/britney.py
@@ -2734,6 +2734,13 @@ class Britney(object):
         for policy in self.policies:
             policy.save_state(self)
 
+        # skip upgrade testing if UPGRADE_OUTPUT option is absent or empty
+        try:
+            if not self.options.upgrade_output:
+                return
+        except AttributeError:
+            return
+
         with open(self.options.upgrade_output, 'w', encoding='utf-8') as f:
             self.__output = f