nix-config-v2/modules/host-users.nix

{
  lib,
  pkgs,
  userName,
  hostname,
  ...
} @ args:
#############################################################
#
#  Host & Users configuration
#
#############################################################
{
  networking.hostName = hostname;
  networking.computerName = hostname;
  system.defaults.smb.NetBIOSName = hostname;

  # Define a user account. Don't forget to set a password with ‘passwd’.
  users.users."${userName}" = {
    home =
      if pkgs.stdenv.isDarwin
      then "/Users/${userName}"
      else "/home/${userName}";
    description = userName;
  };

  nix.settings.trusted-users = [userName];
}