anchor.diff:        "graphical.target"
         "multi-user.target"
         "getty.target"
  -      "rescue.target"
         "network.target"
         "nss-lookup.target"
         "nss-user-lookup.target"
  
positive.code:       "time-sync.target"
        #"cryptsetup.target"
        "sigpwr.target"
  
        # Udev.
        "systemd-udevd-control.socket"
  
negative.code:       "shutdown.target.wants"
      ];
  
    makeJobScript = name: text:
      let x = pkgs.writeTextFile { name = "unit-script"; executable = true; destination = "/bin/${name}"; inherit text; };
      in "${x}/bin/${name}";
  