From f4ccaa51e00d1fa9dde060a90e4b721ddbe5024a Mon Sep 17 00:00:00 2001
From: digital <git-voopaipa@dinid.net>
Date: Tue, 18 Oct 2022 18:24:24 +0200
Subject: nixos/containers: support nixpkgs.hostPlatform

Use hostPlatform if both the host and the containers nixpkgs supports
hostPlatform, otherwise fall back to localSystem. This preseves backwards
compatibility.
---
 nixos/modules/virtualisation/nixos-containers.nix | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/nixos/modules/virtualisation/nixos-containers.nix b/nixos/modules/virtualisation/nixos-containers.nix
index 22be1d5bff9..e7294b30a92 100644
--- a/nixos/modules/virtualisation/nixos-containers.nix
+++ b/nixos/modules/virtualisation/nixos-containers.nix
@@ -1,4 +1,4 @@
-{ config, lib, pkgs, ... }:
+{ config, lib, pkgs, ... }@host:
 
 with lib;
 
@@ -284,7 +284,6 @@ let
     DeviceAllow = map (d: "${d.node} ${d.modifier}") cfg.allowedDevices;
   };
 
-  inherit (config.nixpkgs) localSystem;
   kernelVersion = config.boot.kernelPackages.kernel.version;
 
   bindMountOpts = { name, ... }: {
@@ -480,10 +479,13 @@ in
                 merge = loc: defs: (import "${toString config.nixpkgs}/nixos/lib/eval-config.nix" {
                   modules =
                     let
-                      extraConfig = {
+                      extraConfig = { options, ... }: {
                         _file = "module at ${__curPos.file}:${toString __curPos.line}";
                         config = {
-                          nixpkgs = { inherit localSystem; };
+                          nixpkgs = if options.nixpkgs?hostPlatform && host.options.nixpkgs.hostPlatform.isDefined
+                                    then { inherit (host.config.nixpkgs) hostPlatform; }
+                                    else { inherit (host.config.nixpkgs) localSystem; }
+                          ;
                           boot.isContainer = true;
                           networking.hostName = mkDefault name;
                           networking.useDHCP = false;
-- 
cgit 1.4.1