From baa7aa7bd0a570b3b9edd0b8da859fee3ffaa4d4 Mon Sep 17 00:00:00 2001
From: Rebecca Turner <rbt@sent.as>
Date: Fri, 8 Mar 2024 16:32:20 -0800
Subject: [PATCH] Check for pure eval mode before calling `builtins.storePath`

---
 default.nix | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/default.nix b/default.nix
index bd63229..fa8a1d4 100644
--- a/default.nix
+++ b/default.nix
@@ -110,6 +110,8 @@ let
           if builtins.isPath src
           then
             if dirOf (toString src) == builtins.storeDir
+              # `builtins.storePath` is not available in pure-eval mode.
+              && builtins ? currentSystem
             then
               # If it's already a store path, don't copy it again.
               builtins.storePath src
-- 
2.44.1