From 4853c2d3759bb5d7a894a3457684b71bd8b9c79c Mon Sep 17 00:00:00 2001
From: Frederik Rietdijk <fridh@fridh.nl>
Date: Sat, 18 Dec 2021 14:43:50 +0100
Subject: [PATCH] python2.tests.nixenv-virtualenv: fix test

by using a python env that ignores collisions in the backports packages.
---
 pkgs/development/interpreters/python/tests.nix | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/pkgs/development/interpreters/python/tests.nix b/pkgs/development/interpreters/python/tests.nix
index 764ab29e919b..49dfe0e4644e 100644
--- a/pkgs/development/interpreters/python/tests.nix
+++ b/pkgs/development/interpreters/python/tests.nix
@@ -20,7 +20,15 @@ let
     envs = let
       inherit python;
       pythonEnv = python.withPackages(ps: with ps; [ ]);
-      pythonVirtualEnv = python.withPackages(ps: with ps; [ virtualenv ]);
+      pythonVirtualEnv = if python.isPy3k
+        then
+           python.withPackages(ps: with ps; [ virtualenv ])
+        else
+          python.buildEnv.override {
+            extraLibs = with python.pkgs; [ virtualenv ];
+            # Collisions because of namespaces __init__.py
+            ignoreCollisions = true;
+          };
     in {
       # Plain Python interpreter
       plain = rec {