From 85a0ab4b239148eecd88478a84db96721580538a Mon Sep 17 00:00:00 2001
From: Frederik Rietdijk <fridh@fridh.nl>
Date: Mon, 31 Jul 2017 13:16:29 +0200
Subject: [PATCH] Python: disable user site-packages for programs and
 environments.

Python by default checks a `site-packages` folder in the user's home
folder. We do not want such an impurity and therefore disable it.
Fixes #26846.
---
 pkgs/development/interpreters/python/wrap.sh     | 4 +++-
 pkgs/development/interpreters/python/wrapper.nix | 2 +-
 2 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/pkgs/development/interpreters/python/wrap.sh b/pkgs/development/interpreters/python/wrap.sh
index 1c74e612b55..37bd5b09739 100644
--- a/pkgs/development/interpreters/python/wrap.sh
+++ b/pkgs/development/interpreters/python/wrap.sh
@@ -66,7 +66,9 @@ wrapPythonProgramsIn() {
                     # above. The script will set PYTHONPATH and PATH variables.!
                     # (see pkgs/build-support/setup-hooks/make-wrapper.sh)
                     local -a wrap_args=("$f"
-                                    --prefix PATH ':' "$program_PATH")
+                                    --prefix PATH ':' "$program_PATH"
+                                    --set PYTHONNOUSERSITE "true"
+                                    )
 
                     # Add any additional arguments provided by makeWrapperArgs
                     # argument to buildPythonPackage.
diff --git a/pkgs/development/interpreters/python/wrapper.nix b/pkgs/development/interpreters/python/wrapper.nix
index b4bd532dc1d..65b949661b0 100644
--- a/pkgs/development/interpreters/python/wrapper.nix
+++ b/pkgs/development/interpreters/python/wrapper.nix
@@ -29,7 +29,7 @@ let
           for prg in *; do
             if [ -f "$prg" ]; then
               rm -f "$out/bin/$prg"
-              makeWrapper "$path/bin/$prg" "$out/bin/$prg" --set PYTHONHOME "$out"
+              makeWrapper "$path/bin/$prg" "$out/bin/$prg" --set PYTHONHOME "$out" --set PYTHONNOUSERSITE "true"
             fi
           done
         fi