PREIN

/bin/sh

/usr/share/rpm-helper/add-user ddclient $1 ddclient /var/cache/ddclient /sbin/nologin

POSTIN

/bin/sh

/usr/bin/systemd-tmpfiles --create ddclient.conf 
/usr/share/rpm-helper/create-file ddclient $1 /var/cache/ddclient/ddclient.cache ddclient ddclient 600 

#useless with systemd (not sure but tiggers bugs at uninstall cause
#chkconfig --del do nothing
#_post_service #{name}
#preun
#_preun_service #{name}

POSTUN

/bin/sh

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