postinst is in shorewall-lite 4.4.26.1-1.
This file is a maintainer script. It is executed when installing (*inst) or removing (*rm) the package.
The actual contents of the file can be viewed below.
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 | #!/bin/sh -e
case "$1" in
    configure)
        # if we are upgrading from version < 3.4 then we have to rename the
        # configuration file
        if [ "$2" ] && dpkg --compare-versions "$2" lt "3.4"
        then
            if [ -f /etc/shorewall-lite/shorewall.conf ]
            then
                rm /etc/shorewall-lite/shorewall.conf
            fi
        fi
        ;;
    abort-upgrade|abort-remove|abort-deconfigure)
        ;;
        
    *)
        echo "postinst called with unknown argument \`$1'" >&2
        exit 0
        ;;
esac
# Automatically added by dh_installinit
if [ -x "/etc/init.d/shorewall-lite" ]; then
	update-rc.d shorewall-lite start 40 S . stop 89 0 6 . >/dev/null || exit $?
fi
# End automatically added section
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