From b81ef19d94004db513bfb8b63d27c59f971c96f5 Mon Sep 17 00:00:00 2001
From: Jonathan Ringer <jonringer117@gmail.com>
Date: Fri, 17 Sep 2021 16:20:28 -0700
Subject: [PATCH] home-assistant: inherit NIX_BUILD_CORES for test suite

"auto" will impurely detect how many threads are available.
Running the test suite with 128 threads will also consume about
40GB of ram.
---
 pkgs/servers/home-assistant/default.nix | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/pkgs/servers/home-assistant/default.nix b/pkgs/servers/home-assistant/default.nix
index 9cd83d69eec3..866bbe25a866 100644
--- a/pkgs/servers/home-assistant/default.nix
+++ b/pkgs/servers/home-assistant/default.nix
@@ -743,7 +743,7 @@ in with py.pkgs; buildPythonApplication rec {
 
   pytestFlagsArray = [
     # parallelize test run
-    "--numprocesses auto"
+    "--numprocesses $NIX_BUILD_CORES"
     # assign tests grouped by file to workers
     "--dist loadfile"
     # retry racy tests that end in "RuntimeError: Event loop is closed"