use standard module system over specialArgs

darwin/flake.nix

@@ -44,24 +44,28 @@
 
       # the specialArgs are used to pass the inputs to the system configuration and home-manager configuration
       specialArgs = {
-        inherit inputs username hostname;
+        inherit inputs;
       };
     in
     {
       # it is important that you use darwin.lib.darwinSystem as this is the builder that allow
       # for the configuration of the darwin system
       darwinConfigurations.${hostname} = darwin.lib.darwinSystem {
+        inherit system;
 
         # The specialArgs are used to pass the inputs to the system configuration
         inherit specialArgs;
 
         modules = [
+          ./core.nix
           ./homebrew.nix
-          ./users.nix
+          ./system.nix
 
           # The home-manager module is used to configure home-manager
           # to read more about this please see ../home-manager
           home-manager.darwinModules.home-manager
+          (
+            { config, ... }:
             {
               home-manager.useGlobalPkgs = true;
               home-manager.useUserPackages = true;
@@ -69,9 +73,23 @@
               # extraSpecialArgs is used to pass the inputs to the home-manager configuration
               home-manager.extraSpecialArgs = specialArgs;
 
-            # Here we have assume that the use is called "axel" but you can change that to your needs
-            home-manager.users.${username} = import ./home.nix;
+              # Here we can create our user
+              uses.users.${username} = {
+                home = "/Users/${username}";
+              };
+
+              # And a home-manager configuration for them
+              home-manager.users.${username} = {
+                imports = [ ./home.nix ];
+
+                home.username = username;
+              };
+
+              # Here we set our (networking) host name and computer name. They should usually be the same
+              networking.hostName = hostname;
+              networking.computerName = config.networking.hostName;
             }
+          )
         ];
       };
     };

darwin/home.nix

@@ -1,11 +1,10 @@
-{ username, ... }:
+{ config, ... }:
 {
   # Home Manager needs a bit of information about you and the
   # paths it should manage.
   home = {
     # remember we set this in our flake.nix file
-    username = username;
-    homeDirectory = "/Users/${username}";
+    homeDirectory = "/Users/${config.home.username}";
 
     # This value determines the Home Manager release that your
     # configuration is compatible with. This helps avoid breakage

darwin/homebrew.nix

@@ -1,3 +1,4 @@
+{ config, ... }:
 {
   config = {
     environment = {

darwin/system.nix

@@ -2,6 +2,9 @@
 # see <https://daiderd.com/nix-darwin/manual/index.html#sec-options> for more options
 {
   system = {
+    # remember to set the hostname in the kernel command line
+    defaults.smb.NetBIOSName = config.networking.hostName;
+
     # Add ability to used TouchID for sudo authentication
     security.pam.enableSudoTouchIdAuth = true;
 

darwin/users.nix

@@ -1,9 +0,0 @@
-{ username, hostname, ... }:
-{
-  # remember to set the hostname in the kernel command line
-  networking.hostName = hostname;
-  networking.computerName = hostname;
-  system.defaults.smb.NetBIOSName = hostname;
-
-  users.users."${username}".home = "/Users/${username}";
-}

home-manager/flake.nix

@@ -16,7 +16,7 @@
   };
 
   outputs =
-    { nixpkgs, home-manager, ... }:
+    inputs@{ nixpkgs, home-manager, ... }:
     let
       system = "x86_64-linux";
       pkgs = nixpkgs.legacyPackages.${system};
@@ -28,13 +28,17 @@
 
         # Specify your home configuration modules here, for example,
         # the path to your home.nix.
-        modules = [ ./home.nix ];
+        modules = [
+          ./home.nix
+
+          { home.username = username; }
+        ];
 
-        extraSpecialArgs = {
-          inherit username pkgs; # We inherit pkgs
-        };
         # Optionally use extraSpecialArgs
         # to pass through arguments to home.nix
+        extraSpecialArgs = {
+          inherit inputs;
+        };
       };
     };
 }

home-manager/home.nix

@@ -1,15 +1,9 @@
-{
-  config,
-  pkgs,
-  username,
-  ...
-}:
+{ config, pkgs, ... }:
 {
   # Home Manager needs a bit of information about you and the paths it should
   # manage.
   home = {
-    inherit username;
-    homeDirectory = "/home/${username}";
+    homeDirectory = "/home/${config.home.username}";
 
     # This value determines the Home Manager release that your configuration is
     # compatible with. This helps avoid breakage when a new Home Manager release

system/configuration.nix

@@ -2,8 +2,6 @@
   config,
   lib,
   pkgs,
-  username,
-  hostName,
   ...
 }:
 
@@ -17,7 +15,6 @@
   boot.loader.systemd-boot.enable = true;
   boot.loader.efi.canTouchEfiVariables = true;
 
-  networking.hostName = hostName; # Define your hostname.
   # Pick only one of the below networking options.
   # networking.wireless.enable = true;  # Enables wireless support via wpa_supplicant.
   # networking.networkmanager.enable = true;  # Easiest to use and most distros use this by default.
@@ -59,7 +56,7 @@
   # services.xserver.libinput.enable = true;
 
   # Define a user account. Don't forget to set a password with ‘passwd’.
-  users.users.${username} = {
+  users.users.axol = {
     isNormalUser = true;
     extraGroups = [ "wheel" ]; # Enable ‘sudo’ for the user.
     packages = with pkgs; [ firefox ];

system/flake.nix

@@ -4,17 +4,20 @@
   inputs.nixpkgs.url = "github:auxolotl/nixpkgs/nixpkgs-unstable";
 
   outputs =
-    { nixpkgs, ... }:
+    inputs@{ nixpkgs, ... }:
     let
       system = "x86_64-linux";
-      pkgs = nixpkgs.legacyPackages.${system};
       hostName = builtins.abort "You need to fill in your hostName"; # Set this variable equal to your hostName
-      username = builtins.abort "You need to fill in your username"; # Set this variable equal to your username
     in
     {
       nixosConfigurations.${hostName} = nixpkgs.lib.nixosSystem {
         inherit system;
-        modules = [ ./configuration.nix ];
+        modules = [
+          ./configuration.nix
+
+          { networking.hostName = hostName; }
+        ];
+
         specialArgs = {
           inherit inputs;
         };