set nixpkgs.pkgs based on system to allow users to set architecture within hosts

Author: Pacman99

hosts/NixOS-a64.nix

@@ -0,0 +1,14 @@
+{ suites, ... }:
+{
+  ### root password is empty by default ###
+  imports = suites.base;
+
+  nixpkgs.system = "aarch64-linux";
+
+  boot.loader.systemd-boot.enable = true;
+  boot.loader.efi.canTouchEfiVariables = true;
+
+  networking.networkmanager.enable = true;
+
+  fileSystems."/" = { device = "/dev/disk/by-label/nixos"; };
+}

hosts/default.nix

@@ -3,9 +3,9 @@
 , lib
 , nixos
 , override
-, pkgs
+, multiPkgs
 , self
-, system
+, defaultSystem
 , ...
 }:
 let
@@ -28,7 +28,7 @@ let
             modules;
         };
 
-      global = {
+      global = { config, ... }: {
         home-manager.useGlobalPkgs = true;
         home-manager.useUserPackages = true;
 
@@ -40,7 +40,8 @@ let
           "home-manager=${home}"
         ];
 
-        nixpkgs = { inherit pkgs; };
+
+        nixpkgs.pkgs = lib.mkDefault multiPkgs.${config.nixpkgs.system};
 
         nix.registry = {
           devos.flake = self;
@@ -62,7 +63,9 @@ let
       modOverrides
     ] ++ extern.modules;
 
-  specialArgs = extern.specialArgs // { inherit suites; };
+  specialArgs = extern.specialArgs // {
+    inherit suites multiPkgs;
+  };
 
   mkHostConfig = hostName:
     let
@@ -75,7 +78,8 @@ let
       };
     in
     dev.os.devosSystem {
-      inherit system specialArgs;
+      inherit specialArgs;
+      system = defaultSystem;
 
       modules = modules ++ [
         local