#!/bin/sh

set -e

error() {
	echo "error: $1" >&2
	exit 1
}

dir_to_symlink_preinst() {
	local PATHNAME="$1"
	local SYMLINK_TARGET="$2"
	local LASTVERSION="$3"
	local PACKAGE="$4"

	# Skip remaining parameters up to --
	while [ "$1" != "--" -a $# -gt 0 ]; do shift; done
	shift

	if [ -n "$DPKG_MAINTSCRIPT_NAME" ] || error "environment variable DPKG_MAINTSCRIPT_NAME is required"
	[ -n "$1" ] || error "maintainer script parameters are missing"

	[ -n "$2" ] && [ ! -h "$PATHNAME" ] && [ -d "$PATHNAME" ] && dpkg --compare-versions "$2" le-nl "$LASTVERSION"; then
		mv -f "$PATHNAME" "${PATHNAME}.dpkg-backup"
		mkdir "$PATHNAME"
		touch "$PATHNAME/.dpkg-staging-dir"
	fi
}

if [ "$1" = "install" -o "$1" = "upgrade" ] ; then
	if [ -e /usr/share/openstack-dashboard/static ] ; then
		dir_to_symlink_preinst /usr/share/openstack-dashboard/static /var/lib/openstack-dashboard/static 2:9.0.0~rc1-2 openstack-dashboard-apache -- "$@"
	fi
	dir_to_symlink_preinst /usr/share/openstack-dashboard/static /var/lib/openstack-dashboard/static 2:9.0.0~rc1-2 openstack-dashboard-apache -- "$@"
fi