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