PREIN

/bin/sh

/usr/share/rpm-helper/add-user ntp $1 ntp /etc/ntp /bin/false

PREUN

/bin/sh

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

POSTIN

/bin/sh

/usr/share/rpm-helper/add-service ntp $1 ntpd 
/bin/touch /etc/ntp/step-tickers

POSTUN

/bin/sh

/usr/share/rpm-helper/del-user ntp $1 ntp