anchor.diff:                user "${i.virtualOwner}"
               '';
               postStop = ''
  -              ip link del ${i.name}
  +              ip link del ${i.name} || true
               '';
             };
   
  
positive.code:               ip link set "${n}" up
              '';
              postStop = ''
                ip link delete "${n}"
              '';
            });
  
  
negative.code:               ip link set "${n}" up
              '';
              postStop = ''
                ip link delete "${n}" || true
              '';
            });
  
  