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

Author: Pacman99

flake.nix

@@ -34,17 +34,17 @@
 
       extern = import ./extern { inherit inputs; };
 
-      pkgs' = os.mkPkgs { inherit self; };
+      multiPkgs = os.mkPkgs { inherit self; };
 
       outputs =
         let
-          system = "x86_64-linux";
-          pkgs = pkgs'.${system};
+          defaultSystem = "x86_64-linux";
+          pkgs = multiPkgs.${defaultSystem};
         in
         {
           nixosConfigurations =
             import ./hosts (nixos.lib.recursiveUpdate inputs {
-              inherit pkgs system extern;
+              inherit multiPkgs defaultSystem extern;
               inherit (pkgs) lib;
             });
 
@@ -55,7 +55,7 @@
           overlay = import ./pkgs;
           overlays = lib.pathsToImportedAttrs (lib.pathsIn ./overlays);
 
-          lib = import ./lib { inherit nixos pkgs; };
+          lib = import ./lib { inherit nixos; };
 
           templates.flk.path = ./.;
           templates.flk.description = "flk template";
@@ -74,7 +74,7 @@
         };
 
       systemOutputs = utils.lib.eachDefaultSystem (system:
-        let pkgs = pkgs'.${system}; in
+        let pkgs = multiPkgs.${system}; in
         {
           packages = utils.lib.flattenTreeSystem system
             (os.mkPackages {

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/README.md

@@ -25,6 +25,10 @@ that you intend to use on your machine.
 Additionally, this is the perfect place to import anything you might need from
 the [nixos-hardware][nixos-hardware] repository.
 
+You can set the option `nixpkgs.system` to indicates the host system's 
+architecture. This will result in the host getting an instance of nixpkgs for 
+that architecture. The definition must be one exported by the nixpkgs flake.
+
 ## Example
 
 hosts/librem.nix:

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

lib/default.nix

@@ -1,4 +1,4 @@
-args@{ nixos, pkgs, ... }:
+args@{ nixos, ... }:
 let inherit (nixos) lib; in
 lib.makeExtensible (self:
   let callLibs = file: import file