PREUN
/bin/sh
/usr/share/rpm-helper/del-service virtualbox $1 vboxadd-timesync
POSTIN
/bin/sh
/usr/share/rpm-helper/add-service virtualbox $1 vboxadd-timesync /usr/share/rpm-helper/add-group virtualbox 1 vboxsf
POSTUN
/bin/sh
/usr/share/rpm-helper/del-group virtualbox 1 vboxsf