postinst is in shorewall6 4.5.21.6-1.
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 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 | #!/bin/sh -e
. /usr/share/debconf/confmodule 
case "$1" in
    configure)
        db_reset shorewall6/dont_restart || true
        db_reset shorewall6/major_release || true
        db_go
# Prompt the user about possible changes in new major release (this
# section was previously in configure script)
        
        restart="true"
        # if we are upgrading from version < 3.4 warns the user
        if [ "$2" ] && dpkg --compare-versions "$2" lt "3.4"
        then
            db_input critical shorewall6/major_release || true
            db_go 
            
            db_get shorewall6/major_release || true
            if [ "$RET" = "false" ]
            then
                restart="false"
                db_input critical shorewall6/dont_restart || true
                db_go 
            fi
        fi
        if [ -f "/etc/default/shorewall6" ]
        then
            . /etc/default/shorewall6
        fi
        if [ "$restart" = "true" ] && [ "$startup" = "1" ]
        then 
            if /sbin/shorewall6 check
            then
                if [ -x "/usr/sbin/invoke-rc.d" ]
                then
                    invoke-rc.d shorewall6 restart
                else
                    /etc/init.d/shorewall6 restart
                fi
            else
                db_input critical shorewall6/invalid_config || true
            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/shorewall6" ]; then
	if [ ! -e "/etc/init/shorewall6.conf" ]; then
		update-rc.d shorewall6 start 40 S . stop 89 0 6 . >/dev/null
	fi
fi
# End automatically added section
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