From 48b2f723f58b7b80f4398317108fb17a428b3a9c Mon Sep 17 00:00:00 2001
From: K900 <me@0upti.me>
Date: Wed, 29 Mar 2023 17:49:30 +0300
Subject: [PATCH] nixos/system: disallow system.copySystemConfiguration in pure
 eval mode

This is already broken, so let's give it a better error message.
---
 nixos/modules/system/activation/top-level.nix | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/nixos/modules/system/activation/top-level.nix b/nixos/modules/system/activation/top-level.nix
index 896f8c0a6935..74ab7070fd0f 100644
--- a/nixos/modules/system/activation/top-level.nix
+++ b/nixos/modules/system/activation/top-level.nix
@@ -338,6 +338,12 @@ in
 
 
   config = {
+    assertions = [
+      {
+        assertion = config.system.copySystemConfiguration -> !lib.inPureEvalMode;
+        message = "system.copySystemConfiguration is not supported with flakes";
+      }
+    ];
 
     system.extraSystemBuilderCmds =
       optionalString