postinst is in routino-www 3.0-3.
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.
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# postinst script for routino-www
#
set -e
if [ "$DPKG_DEBUG" = "developer" ]; then
	set -x
fi
avahi_install() {
	if [ -d /etc/avahi/services/ -a ! -e /etc/avahi/services/routino-www.service -a ! -L /etc/avahi/services/routino-www.service ] ; then
		ln -s ../../routino-www/routino-www.service /etc/avahi/services/
	fi
}
desktop_install() {
	if [ -d /usr/share/applications/ -a ! -e /usr/share/applications/routino-www.desktop -a ! -L /usr/share/applications/routino-www.desktop ] ; then
		ln -s /etc/routino-www/routino-www.desktop /usr/share/applications/
	fi
}
apache_install() {
	mkdir -p /etc/apache2/conf-available
	ln -sf ../../routino-www/apache.conf /etc/apache2/conf-available/routino-www.conf
	
	COMMON_STATE=$(dpkg-query -f '${Status}' -W 'apache2.2-common' 2>/dev/null | awk '{print $3}' || true)
	if [ -e /usr/share/apache2/apache2-maintscript-helper ] ; then
		. /usr/share/apache2/apache2-maintscript-helper
		apache2_invoke enconf routino-www || exit $?
	elif [ "$COMMON_STATE" = "installed" ] || [ "$COMMON_STATE" = "unpacked" ] ; then
		[ -d /etc/apache2/conf.d/ ] && [ ! -L /etc/apache2/conf.d/routino-www.conf ] && ln -s ../conf-available/routino-www.conf /etc/apache2/conf.d/routino-www.conf
	fi
}
case "$1" in
	configure)
		if [ ! -d "/var/lib/routino/data" ] ; then
			mkdir -p /var/lib/routino/data
		fi
		if [ ! -d "/var/lib/routino/results" ] ; then
			mkdir -p /var/lib/routino/results
		fi
		chown -R www-data:www-data /var/lib/routino/results
		webservers="apache2"
		for webserver in $webservers; do
			webserver=${webserver%,}
			if [ "$webserver" = "lighttpd" ] ; then
				lighttpd_install
			else
				apache_install $1
			fi
			# Reload webserver in any case, configuration might have changed
			# Redirection of 3 is needed because Debconf uses it and it might 
			# be inherited by webserver. See bug #446324.
					if [ -f /etc/init.d/$webserver ] ; then
							if [ -x "`which invoke-rc.d 2>/dev/null`" ]; then
									invoke-rc.d $webserver reload 3>/dev/null || true
							else
									/etc/init.d/$webserver reload 3>/dev/null || true
							fi
					fi
		done
		avahi_install
		desktop_install
	;;
	abort-upgrade|abort-remove|abort-deconfigure)
	;;
	*)
		echo "postinst called with unknown argument \`$1'" >&2
		exit 1
	;;
esac
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