From aca0fb812c1566b436a4d8c8904a60f142444e8b Mon Sep 17 00:00:00 2001
From: "W. Trevor King" <wking@tremily.us>
Date: Sun, 30 Dec 2012 11:41:25 -0500
Subject: [PATCH] swc-installation-test-2.py: Cache check errors

Avoid running the same check (e.g. 'python') over and over.
---
 swc-installation-test-2.py | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/swc-installation-test-2.py b/swc-installation-test-2.py
index 34daeec..f307e8a 100755
--- a/swc-installation-test-2.py
+++ b/swc-installation-test-2.py
@@ -118,6 +118,7 @@ class Dependency (object):
         if not or_dependencies:
             or_dependencies = []
         self.or_dependencies = or_dependencies
+        self._check_error = None
 
     def __str__(self):
         return '<{0} {1}>'.format(type(self).__name__, self.name)
@@ -129,8 +130,14 @@ class Dependency (object):
             return '{0} ({1})'.format(self.long_name, self.name)
 
     def check(self):
-        self._check_dependencies()
-        self._check()
+        if self._check_error:
+            raise self._check_error
+        try:
+            self._check_dependencies()
+            self._check()
+        except DependencyError as e:
+            self._check_error = e  # cache for future calls
+            raise
 
     def _check_dependencies(self):
         for dependency in self.and_dependencies:
-- 
2.26.2