From d4b7278fbdf6c936f5d7cc1dff6d63288e332b3e Mon Sep 17 00:00:00 2001
From: Ivan Babrou <github@ivan.computer>
Date: Fri, 5 Mar 2021 17:46:04 -0800
Subject: [PATCH] python3Packages.py-cpuinfo: add sysctl to runtime
 dependencies

---
 pkgs/development/python-modules/py-cpuinfo/default.nix | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/pkgs/development/python-modules/py-cpuinfo/default.nix b/pkgs/development/python-modules/py-cpuinfo/default.nix
index 455b91663e2..0afc75bf87c 100644
--- a/pkgs/development/python-modules/py-cpuinfo/default.nix
+++ b/pkgs/development/python-modules/py-cpuinfo/default.nix
@@ -1,7 +1,9 @@
 { lib
+, stdenv
 , fetchFromGitHub
 , buildPythonPackage
 , pytestCheckHook
+, sysctl
 }:
 
 buildPythonPackage rec {
@@ -15,6 +17,13 @@ buildPythonPackage rec {
      sha256 = "10qfaibyb2syiwiyv74l7d97vnmlk079qirgnw3ncklqjs0s3gbi";
   };
 
+  # On Darwin sysctl is used to read CPU information.
+  postPatch = lib.optionalString stdenv.isDarwin ''
+    substituteInPlace cpuinfo/cpuinfo.py \
+      --replace "len(_program_paths('sysctl')) > 0" "True" \
+      --replace "_run_and_get_stdout(['sysctl'" "_run_and_get_stdout(['${sysctl}/bin/sysctl'"
+  '';
+
   checkInputs = [
     pytestCheckHook
   ];