{ config, lib, pkgs, ... }: let cfg = config.nyx-module.system.docker; in { options.nyx-module.system.docker = { enable = lib.mkEnableOption "Enable docker (system) module"; package = lib.mkOption { type = lib.types.package; default = pkgs.docker; description = "Package to install for docker."; }; }; config = lib.mkIf cfg.enable { environment.systemPackages = [ cfg.package ]; }; }