#!/bin/sh
# preinst script for newpkg
#
# see: dh_installdeb(1)

set -e

# summary of how this script can be called:
#        * <new-preinst> `install'
#        * <new-preinst> `install' <old-version>
#        * <new-preinst> `upgrade' <old-version>
#        * <old-preinst> `abort-upgrade' <new-version>
# for details, see http://www.debian.org/doc/debian-policy/ or
# the debian-policy package

preinst_upgrade()
{
	local oldver="$1"
	local udev_user_rulesdir="/etc/udev/rules.d"

	# we have to fixup the filesystem here as previous packages of
	# ifupdown2 introduced a bug in the postrm script that require
	# these files to exist, otherwise the postrm script will always
	# fail.
	local badver="0.1-cl2.5+2"
	if dpkg --compare-versions "${oldver}" "lt" "${badver}"; then
		local files="${udev_user_rulesdir}/80-networking.rules
			${udev_user_rulesdir}/60-bridge-network-interface.rules"
		for f in ${files}; do
			echo "touching udev rule: ${f}"
			test ! -e "${f}" && ln -s /dev/null "${f}" || \
				/bin/echo -e "\tudev rule exists leaving"
		done
	fi
}

case "$1" in
	install|upgrade)
		preinst_upgrade "$2"
	;;

	abort-upgrade)
	;;

	*)
		echo "preinst called with unknown argument \`$1'" >&2
		exit 1
	;;
esac

# dh_installdeb will replace this with shell code automatically
# generated by other debhelper scripts.

#DEBHELPER#

exit 0