PREIN
/bin/sh
getent group docker > /dev/null || /usr/sbin/groupadd -r docker exit 0
PREUN
/bin/sh
if [ $1 -eq 0 ] ; then # Package removal, not upgrade systemctl --no-reload disable --now docker >/dev/null 2>&1 || : fi
POSTIN
/bin/sh
if [ $1 -eq 1 ] ; then # Initial installation systemctl --no-reload preset docker >/dev/null 2>&1 || : fi
POSTUN
/bin/sh
if [ $1 -ge 1 ] ; then # Package upgrade, not uninstall systemctl try-restart docker >/dev/null 2>&1 || : fi