PREIN

/bin/sh

getent group mach >/dev/null || groupadd -r mach || :

PREUN

/bin/sh

if [ "$1" == 0 ];
then
  # last removal
  # be a good boy and clean out the dirs we filled with junk
  rm -rf /var/lib/mach/states/*
  umount /var/lib/mach/roots/*/proc > /dev/null 2>&1 || :
  rm -rf /var/lib/mach/roots/*
  rm -rf /var/cache/mach/* > /dev/null 2>&1 || :
  rmdir /var/lib/mach/states > /dev/null 2>&1 || :
  rmdir /var/lib/mach/roots > /dev/null 2>&1 || :
  rmdir /var/cache/mach > /dev/null 2>&1 || :
  rm -rf /var/tmp/mach > /dev/null 2>&1 || :
fi