PREIN

/bin/sh

getent group ddclient > /dev/null || /usr/sbin/groupadd -r ddclient
getent passwd ddclient > /dev/null || /usr/sbin/useradd -r -g ddclient -d /var/cache/ddclient -s /sbin/nologin -c "Dynamic DNS Client" ddclient
exit 0

PREUN

/bin/sh

  
if [ $1 -eq 0 ] ; then 
        # Package removal, not upgrade 
        /usr/bin/systemctl --no-reload disable ddclient.service > /dev/null 2>&1 || : 
        /usr/bin/systemctl stop ddclient.service > /dev/null 2>&1 || : 
fi

POSTIN

/bin/sh

  
if [ $1 -eq 1 ] ; then 
        # Initial installation 
        /usr/bin/systemctl preset ddclient.service >/dev/null 2>&1 || : 
fi

POSTUN

/bin/sh

  
/usr/bin/systemctl daemon-reload >/dev/null 2>&1 || : 
if [ $1 -ge 1 ] ; then 
        # Package upgrade, not uninstall 
        /usr/bin/systemctl try-restart ddclient.service >/dev/null 2>&1 || : 
fi

Triggers

ddclient < 3.8.1-1

/bin/sh

# Save the current service runlevel info
# User must manually run systemd-sysv-convert --apply ddclient
# to migrate them to systemd targets
/usr/bin/systemd-sysv-convert --save ddclient >/dev/null 2>&1 ||:

# Run these because the SysV package being removed won't do them
/sbin/chkconfig --del ddclient > /dev/null 2>&1 || :
/bin/systemctl try-restart ddclient.service > /dev/null 2>&1 || :