anchor.diff:  
   { config, pkgs, ... }:
   
  +with pkgs.lib;
  +
   let
  -
  -  inherit (pkgs.lib) mkOption types;
   
     options = {
   
  
positive.code: 
        # Copy modprobe.
        cp -v ${pkgs.module_init_tools}/sbin/modprobe $out/bin/modprobe.real
  
        ${config.boot.initrd.extraUtilsCommands}
  
  
negative.code: 
      boot.initrd.postDeviceCommands = mkOption {
        default = "";
        merge = mergeStringOption;
        description = ''
          Shell commands to be executed immediately after stage 1 of the
          boot has loaded kernel modules and created device nodes in
  