From fff85e82d45453045b21a99a76ae33802f5c9550 Mon Sep 17 00:00:00 2001
From: Malthe Borch <mborch@gmail.com>
Date: Wed, 10 Aug 2011 11:14:52 +0000
Subject: [PATCH] Guard ``sys.modules`` against import time side effects using
 ``ProxyFactory``.

---
 CHANGES.txt                | 5 +++++
 src/z3c/pt/pagetemplate.py | 3 ++-
 2 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/CHANGES.txt b/CHANGES.txt
index 186a41c..a085b61 100644
--- a/CHANGES.txt
+++ b/CHANGES.txt
@@ -1,6 +1,11 @@
 Changelog
 =========
 
+In next release ...
+
+- Guard ``sys.modules`` (mapped to the builtin variable "modules")
+  against import-time side effects using ``ProxyFactory``.
+
 2.1 (2011-07-28)
 ~~~~~~~~~~~~~~~~
 
diff --git a/src/z3c/pt/pagetemplate.py b/src/z3c/pt/pagetemplate.py
index 517c3bb..d2ce102 100644
--- a/src/z3c/pt/pagetemplate.py
+++ b/src/z3c/pt/pagetemplate.py
@@ -2,6 +2,7 @@
 import sys
 
 from zope import i18n
+from zope.security.proxy import ProxyFactory
 
 from chameleon.i18n import fast_translate
 from chameleon.zpt import template
@@ -37,7 +38,7 @@ def __len__(self):
     def __repr__(self):
         return "{...} (%d entries)" % len(self)
 
-sys_modules = OpaqueDict(sys.modules)
+sys_modules = ProxyFactory(OpaqueDict(sys.modules))
 
 
 class DummyRegistry(object):