From e4f697a17c8678a848ee9bc12324b6e1a79ee078 Mon Sep 17 00:00:00 2001
From: Steven Pease <peasteven@gmail.com>
Date: Sun, 31 Oct 2021 12:33:14 -0700
Subject: [PATCH] Guard against double-sourcing

---
 modules/environment/default.nix | 1 +
 1 file changed, 1 insertion(+)

diff --git a/modules/environment/default.nix b/modules/environment/default.nix
index 601b0ca8..9544937b 100644
--- a/modules/environment/default.nix
+++ b/modules/environment/default.nix
@@ -184,6 +184,7 @@ in
 
     system.build.setEnvironment = pkgs.writeText "set-environment" ''
       # Prevent this file from being sourced by child shells.
+      if [ -n "${__NIX_DARWIN_SET_ENVIRONMENT_DONE:-}" ]; then return; fi
       export __NIX_DARWIN_SET_ENVIRONMENT_DONE=1
 
       export PATH=${config.environment.systemPath}