Added support for multiple machines and also added more config

machines/laptop/configuration.nix

@@ -0,0 +1,127 @@
+
+# This is your system's configuration file.
+# Use this to configure your system environment (it replaces /etc/nixos/configuration.nix)
+{
+  inputs,
+  outputs,
+  lib,
+  config,
+  pkgs,
+  ...
+}: {
+  # You can import other NixOS modules here
+  imports = [
+    # If you want to use modules your own flake exports (from modules/nixos):
+    # outputs.nixosModules.example
+
+    # Or modules from other flakes (such as nixos-hardware):
+    # inputs.hardware.nixosModules.common-cpu-amd
+    # inputs.hardware.nixosModules.common-ssd
+
+    # You can also split up your configuration and import pieces of it here:
+    # ./users.nix
+
+    # Import your generated (nixos-generate-config) hardware configuration
+    inputs.home-manager.nixosModules.home-manager
+    ./hardware-configuration.nix
+  ];
+
+
+  home-manager = {
+    extraSpecialArgs = { inherit inputs outputs; };
+    users = {
+      # Import your home-manager configuration
+      horseman = import ../home-manager/home.nix;
+    };
+  };
+
+  nixpkgs = {
+    # You can add overlays here
+    overlays = [
+      # Add overlays your own flake exports (from overlays and pkgs dir):
+      outputs.overlays.additions
+      outputs.overlays.modifications
+      outputs.overlays.unstable-packages
+
+      # You can also add overlays exported from other flakes:
+      # neovim-nightly-overlay.overlays.default
+
+      # Or define it inline, for example:
+      # (final: prev: {
+      #   hi = final.hello.overrideAttrs (oldAttrs: {
+      #     patches = [ ./change-hello-to-hi.patch ];
+      #   });
+      # })
+    ];
+    # Configure your nixpkgs instance
+    config = {
+      # Disable if you don't want unfree packages
+      allowUnfree = true;
+    };
+  };
+
+  # This will add each flake input as a registry
+  # To make nix3 commands consistent with your flake
+  nix.registry = (lib.mapAttrs (_: flake: {inherit flake;})) ((lib.filterAttrs (_: lib.isType "flake")) inputs);
+
+  # This will additionally add your inputs to the system's legacy channels
+  # Making legacy nix commands consistent as well, awesome!
+  nix.nixPath = ["/etc/nix/path"];
+  environment.etc =
+    lib.mapAttrs'
+    (name: value: {
+      name = "nix/path/${name}";
+      value.source = value.flake;
+    })
+    config.nix.registry;
+
+  nix.settings = {
+    # Enable flakes and new 'nix' command
+    experimental-features = "nix-command flakes";
+    # Deduplicate and optimize nix store
+    auto-optimise-store = true;
+  };
+
+  networking.hostName = "laptop-koen";
+
+  # time.timeZone = "Europe/Amsterdam";
+
+  # i18n.defaultLocale = "en_US.UTF-8";
+
+  services.xserver.enable = true;
+  services.xserver.desktopManager.gnome.enable = true;
+  services.xserver.displayManager.gdm.enable = true;
+  boot.loader.systemd-boot.enable = true;  
+
+
+  # TODO: Configure your system-wide user settings (groups, etc), add more users as needed.
+  users.users = {
+    horseman = {
+      # TODO: You can set an initial password for your user.
+      # If you do, you can skip setting a root password by passing '--no-root-passwd' to nixos-install.
+      # Be sure to change it (using passwd) after rebooting!
+      initialPassword = "1234";
+      isNormalUser = true;
+      openssh.authorizedKeys.keys = [
+        # TODO: Add your SSH public key(s) here, if you plan on using SSH to connect
+      ];
+      # TODO: Be sure to add any other groups you need (such as networkmanager, audio, docker, etc)
+      extraGroups = ["wheel"];
+    };
+  };
+
+  # This setups a SSH server. Very important if you're setting up a headless system.
+  # Feel free to remove if you don't need it.
+  services.openssh = {
+    enable = true;
+    settings = {
+      # Forbid root login through SSH.
+      PermitRootLogin = "no";
+      # Use keys only. Remove if you want to SSH using password (not recommended)
+      PasswordAuthentication = false;
+    };
+  };
+
+  # https://nixos.wiki/wiki/FAQ/When_do_I_update_stateVersion
+  system.stateVersion = "23.05";
+}

machines/laptop/hardware-configuration.nix

@@ -0,0 +1,41 @@
+# Do not modify this file!  It was generated by ‘nixos-generate-config’
+# and may be overwritten by future invocations.  Please make changes
+# to /etc/nixos/configuration.nix instead.
+{ config, lib, pkgs, modulesPath, ... }:
+
+{
+  imports =
+    [ (modulesPath + "/installer/scan/not-detected.nix")
+    ];
+
+  boot.initrd.availableKernelModules = [ "xhci_pci" "ahci" "nvme" "usbhid" "usb_storage" "sd_mod" ];
+  boot.initrd.kernelModules = [ ];
+  boot.kernelModules = [ "kvm-intel" ];
+  boot.extraModulePackages = [ ];
+
+  fileSystems."/" =
+    { device = "/dev/disk/by-uuid/4c50d5fb-2734-4acf-9aa9-daa4dbd8c982";
+      fsType = "ext4";
+    };
+
+  fileSystems."/boot" =
+    { device = "/dev/disk/by-uuid/7FE8-93C8";
+      fsType = "vfat";
+    };
+
+  swapDevices =
+    [ { device = "/dev/disk/by-uuid/1a5004e0-dfcb-4986-aa3d-e2cc9e81f70b"; }
+    ];
+
+  # Enables DHCP on each ethernet and wireless interface. In case of scripted networking
+  # (the default) this is the recommended approach. When using systemd-networkd it's
+  # still possible to use this option, but it's recommended to use it in conjunction
+  # with explicit per-interface declarations with `networking.interfaces.<interface>.useDHCP`.
+  networking.useDHCP = lib.mkDefault true;
+  # networking.interfaces.enp3s0.useDHCP = lib.mkDefault true;
+  # networking.interfaces.wlo1.useDHCP = lib.mkDefault true;
+
+  nixpkgs.hostPlatform = lib.mkDefault "x86_64-linux";
+  powerManagement.cpuFreqGovernor = lib.mkDefault "powersave";
+  hardware.cpu.intel.updateMicrocode = lib.mkDefault config.hardware.enableRedistributableFirmware;
+}