動画で使ったNixOSのconfiguration.nix。https://youtu.be/Z8Gx1-bW8rI

configuration.nix

# Edit this configuration file to define what should be installed on
# your system.  Help is available in the configuration.nix(5) man page
# and in the NixOS manual (accessible by running ‘nixos-help’).

{ config, pkgs, ... }:

{
  imports =
    [
      ./hardware-configuration.nix
    ];

  boot.loader.systemd-boot.enable = true;
  boot.loader.efi.canTouchEfiVariables = true;

  networking.hostName = "dell-chan";
  networking.networkmanager.enable = true;

  time.timeZone = "Asia/Tokyo";

  users = {
    users = {
      root = {
        isSystemUser = true;
        extraGroups = [
          "root"
        ];
      };
      haruki = {
        isNormalUser = true;
        extraGroups = [
          "wheel"
        ];
      };
    };
  };

  environment.systemPackages = with pkgs; [
    vim
    wget
  ];

  services.openssh.enable = true;

  system.copySystemConfiguration = true;
  system.stateVersion = "22.11";

}