From b682778366f91bd3a2b5746cfc951ad429904f16 Mon Sep 17 00:00:00 2001
From: Robert Hensing <robert@roberthensing.nl>
Date: Sun, 4 Nov 2018 23:09:43 +0100
Subject: nixos/../nixpkgs.nix: Add assertions to check pkgs' system

---
 nixos/modules/misc/nixpkgs.nix | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

(limited to 'nixos/modules/misc')

diff --git a/nixos/modules/misc/nixpkgs.nix b/nixos/modules/misc/nixpkgs.nix
index 461a3b68ed61..2bebbdcad94a 100644
--- a/nixos/modules/misc/nixpkgs.nix
+++ b/nixos/modules/misc/nixpkgs.nix
@@ -218,5 +218,24 @@ in
     _module.args = {
       pkgs = finalPkgs;
     };
+
+    assertions = [
+      (
+        let
+          nixosExpectedSystem =
+            if config.nixpkgs.crossSystem != null
+            then config.nixpkgs.crossSystem.system
+            else config.nixpkgs.localSystem.system;
+          nixosOption =
+            if config.nixpkgs.crossSystem != null
+            then "nixpkgs.crossSystem"
+            else "nixpkgs.localSystem";
+          pkgsSystem = finalPkgs.stdenv.targetPlatform.system;
+        in {
+          assertion = nixosExpectedSystem == pkgsSystem;
+          message = "The NixOS nixpkgs.pkgs option was set to a Nixpkgs invocation that compiles to target system ${pkgsSystem} but NixOS was configured for system ${nixosExpectedSystem} via NixOS option ${nixosOption}. The NixOS system settings must match the Nixpkgs target system.";
+        }
+      )
+    ];
   };
 }
-- 
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