From 8c4ff5cb63dab6632f643da49f87cc86dcc3d8c9 Mon Sep 17 00:00:00 2001
From: Brad Warren <bmw@eff.org>
Date: Thu, 10 Aug 2017 16:36:08 -0700
Subject: [PATCH] Use context manager to read conf file.

---
 certbot-postfix/certbot_postfix/installer.py | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/certbot-postfix/certbot_postfix/installer.py b/certbot-postfix/certbot_postfix/installer.py
index 546cf49cc..bba46a168 100644
--- a/certbot-postfix/certbot_postfix/installer.py
+++ b/certbot-postfix/certbot_postfix/installer.py
@@ -70,7 +70,8 @@ class Installer(plugins_common.Plugin):
         self._set_config_dir()
 
         self.fn = self.find_postfix_cf()
-        self.raw_cf = open(self.fn).readlines()
+        with open(self.fn) as f:
+            self.raw_cf = f.readlines()
         self.cf = map(string.strip, self.raw_cf)
         #self.cf = [line for line in cf if line and not line.startswith("#")]
         # XXX ensure we raise the right kinds of exceptions