From dc75c9ce41238a6413cb7fa56ac9afdb7f6527e0 Mon Sep 17 00:00:00 2001
From: Scott K Logan <logans@cottsay.net>
Date: Mon, 17 Jun 2024 09:19:47 -0500
Subject: [PATCH] Don't write Python bytecode when invoking pytest

This should prevent pytest invocations via ament_add_pytest_test from
writing __pycache__ directories into the package sources.
---
 ament_cmake_pytest/cmake/ament_add_pytest_test.cmake | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/ament_cmake_pytest/cmake/ament_add_pytest_test.cmake b/ament_cmake_pytest/cmake/ament_add_pytest_test.cmake
index 7afe858a..06abfbd1 100644
--- a/ament_cmake_pytest/cmake/ament_add_pytest_test.cmake
+++ b/ament_cmake_pytest/cmake/ament_add_pytest_test.cmake
@@ -99,6 +99,8 @@ function(ament_add_pytest_test testname path)
     "--junit-prefix=${PROJECT_NAME}"
   )
 
+  set(ARG_ENV PYTHONDONTWRITEBYTECODE=1 ${ARG_ENV})
+
   if(ARG_NOCAPTURE)
     # disable output capturing
     list(APPEND cmd "-s")