#! /bin/sh

set -e

prevver="$2"

add_munin_system_user() {
	if ! getent passwd munin >/dev/null; then
		adduser --group --system --no-create-home \
			--home /var/lib/munin munin;
	fi
	# workaround bug (#531021) in xen-tools
	if ! getent group munin >/dev/null; then
	        addgroup --system munin
	        adduser munin munin
	fi
}

initperms() {
	chown munin:adm /var/log/munin
	chmod 755 /var/log/munin

	chown munin:munin /var/lib/munin
	chmod 755 /var/lib/munin

	# create munin-cgi-html.log since www-data cannot create it itself
	touch /var/log/munin/munin-cgi-html.log
	chown www-data:adm /var/log/munin/munin-cgi-html.log
	chmod 750 /var/log/munin/munin-cgi-html.log

	# create munin-cgi-graph.log since www-data cannot create it itself
	touch /var/log/munin/munin-cgi-graph.log
	chown www-data:adm /var/log/munin/munin-cgi-graph.log
	chmod 750 /var/log/munin/munin-cgi-graph.log

	chown munin:munin /var/cache/munin/www
	chmod 755 /var/cache/munin/www

	mkdir -p /var/lib/munin/cgi-tmp
	chown munin:www-data /var/lib/munin/cgi-tmp
	chmod 775 /var/lib/munin/cgi-tmp
}

fixoverrides() {

        overrides="
/var/cache/munin/www
/var/lib/munin
/var/log/munin
/var/log/munin/munin-cgi-graph.log
/var/log/munin/munin-cgi-html.log
"

        for override in $overrides; do
                if dpkg-statoverride --list $override >/dev/null; then
                        dpkg-statoverride --remove $override
                fi
        done
}

apache_install() {
	# if you add more webservers here, dont forget to also remove them in postrm
        webserver=apache2
        webserver_init_script="/etc/init.d/$webserver"
        if [ -d /etc/$webserver/conf.d ] && [ ! -e /etc/$webserver/conf.d/munin ]; then
		if [ -z "$prevver" ] || ( dpkg --compare-versions $prevver ge 1.4.6-1~ && dpkg --compare-versions $prevver lt 1.4.7~ ) ; then
			# only create link on new installs
			# or when upgrading from a version where it was removed unconditionally
	                ln -s ../../munin/apache.conf /etc/$webserver/conf.d/munin
		fi
		if [ -f $webserver_init_script ];then
			if [ -x $webserver_init_script ]; then
				invoke-rc.d $webserver reload 3>/dev/null || true
			else
				echo "munin: $webserver_init_script is not executable."\
				     "Could not reload $webserver"
			fi
		fi
        fi

	# installing configuration for Apache 2.4
	# link config to conf-available
	if [ -d /etc/$webserver/conf-available ] && [ ! -e /etc/$webserver/conf-available/munin.conf ]; then
		ln -s ../../munin/apache.conf /etc/$webserver/conf-available/munin.conf

		# activate configuration on new install with apache2-mainscript-helper
		# TODO: Migration from installed Munin with apache2.2 to apache 2.4
		if [ -z "$prevver" ]; then
			if [ -e /usr/share/apache2/apache2-maintscript-helper ] ; then
				. /usr/share/apache2/apache2-maintscript-helper
				apache2_invoke enconf munin.conf
			fi
		fi
	fi
}


case "$1" in
	configure)
		add_munin_system_user
		# this can go away after wheezy
		if dpkg --compare-versions "$2" le "2.0~rc5-1" ; then
			fixoverrides
		fi
		if dpkg --compare-versions "$2" le "2.0~rc6-2" || [ "$2" = 0 ] ; then
			initperms
		fi
		apache_install
		;;
	abort-upgrade|abort-deconfigure|abort-remove)
		:
		;;
	*)
		echo "Called with unknown argument $1, bailing out."
		exit 1
		;;
esac

# Automatically added by dh_installinit
if [ -x "/etc/init.d/munin" ]; then
	update-rc.d munin defaults >/dev/null
	invoke-rc.d munin start || exit $?
fi
# End automatically added section