postinst is in routino-www 2.4.1-1.
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
# postinst script for routino-www
#
set -e
if [ "$DPKG_DEBUG" = "developer" ]; then
	set -x
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
	;;
	abort-upgrade|abort-remove|abort-deconfigure)
	;;
	*)
		echo "postinst called with unknown argument \`$1'" >&2
		exit 1
	;;
esac
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