anchor.diff:          # instead, to ensure that login terminates cleanly.
           KillSignal=SIGHUP
         '';
  -
  +    
       boot.systemd.units."serial-getty@.service".text =
         ''
           [Unit]
  
positive.code: 
      environment.etc = singleton
        { # Friendly greeting on the virtual consoles.
          source = issueFile;
          target = "issue";
        };
  
  
negative.code: { config, pkgs, ... }:
  
  with pkgs.lib;
  
  {
  
  