From f8dab9b7ac9306169aee2b740c2e42c96b51c228 Mon Sep 17 00:00:00 2001
From: Hynek Schlawack <hs@ox.cx>
Date: Thu, 1 Jun 2017 09:20:30 +0200
Subject: [PATCH] Use VIRTUALENV_NO_DOWNLOAD in tox (#200)

---
 tox.ini | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/tox.ini b/tox.ini
index 61eea75f..ab2842e9 100644
--- a/tox.ini
+++ b/tox.ini
@@ -3,6 +3,10 @@ envlist = py27,py34,py35,py36,pypy,flake8,manifest,docs,readme,coverage-report
 
 
 [testenv]
+# Prevent random setuptools/pip breakages like
+# https://github.com/pypa/setuptools/issues/1042 from breaking our builds.
+setenv =
+    VIRTUALENV_NO_DOWNLOAD=1
 deps = -rdev-requirements.txt
 commands = python -m pytest {posargs}