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