PREIN

/bin/sh

/usr/share/rpm-helper/add-user openntpd $1 ntp /var/empty /bin/false 
/usr/sbin/usermod -d /var/empty ntp

PREUN

/bin/sh

/usr/share/rpm-helper/del-service openntpd $1 ntpd

POSTIN

/bin/sh

/usr/share/rpm-helper/add-service openntpd $1 ntpd