PREIN

/bin/sh

getent group vnstat > /dev/null || /usr/sbin/groupadd -r vnstat
getent passwd vnstat > /dev/null || /usr/sbin/useradd -r -g vnstat -M \
  -d /var/lib/vnstat -s /sbin/nologin -c "vnStat user" vnstat

PREUN

/bin/sh

if [ "$1" = 0 ] ; then
  /sbin/service vnstat stop > /dev/null 2>&1
  /sbin/chkconfig --del vnstat || :
fi

POSTIN

/bin/sh

/sbin/chkconfig --add vnstat || :

POSTUN

/bin/sh

if [ "$1" -ge 1 ]; then
  /sbin/service vnstat try-restart >/dev/null 2>&1 || :
fi