From 9c4ffe2b9e848fb8ae6b51a3ee71c5f3055109d9 Mon Sep 17 00:00:00 2001
From: Archit Gupta <archit@accelbread.com>
Date: Tue, 22 Apr 2025 19:23:59 -0700
Subject: [PATCH] Don't substitute flake checks

Querying caches is slow and these are unlikely to be found on a cache.
---
 builtinModules/checks.nix | 14 ++++++++------
 1 file changed, 8 insertions(+), 6 deletions(-)

diff --git a/builtinModules/checks.nix b/builtinModules/checks.nix
index 4c2afd5..c8f51a2 100644
--- a/builtinModules/checks.nix
+++ b/builtinModules/checks.nix
@@ -10,12 +10,14 @@ let
   inherit (flakelight.types) coercedTo' drv nullable optFunctionTo stringLike;
 
   mkCheck = name: pkgs: cmd:
-    pkgs.runCommand "check-${name}" { } ''
-      cp --no-preserve=mode -r ${src} src
-      cd src
-      ${cmd}
-      touch $out
-    '';
+    pkgs.runCommand "check-${name}"
+      { allowSubstitutes = false; }
+      ''
+        cp --no-preserve=mode -r ${src} src
+        cd src
+        ${cmd}
+        touch $out
+      '';
 
   checkType = mkOptionType {
     name = "checkType";