#!/bin/sh

set -e

mvverbose=-v

# from dpkg-maintscript-helper, modified
ensure_package_owns_file() {
	local PACKAGE="$1"
	local FILE="$2"

	dpkg-query -L "$PACKAGE" | grep -F -q -x "$FILE"
}

# from dpkg-maintscript-helper, modified
finish_mv_conffile() {
	local CONFFILE="$1"
	local NEWCONFFILE="$2"
	local PACKAGE="$3"

	rm $mvverbose -f "$CONFFILE.dpkg-remove"

	[ -e "$CONFFILE.dpkg-backup" ] || return 0
	ensure_package_owns_file "$PACKAGE" "$NEWCONFFILE" || return 0

	echo "Preserving user changes to $NEWCONFFILE (now owned by $PACKAGE)..."
	if [ -e "$NEWCONFFILE" ]; then
		mv $mvverbose -f "$NEWCONFFILE" "$NEWCONFFILE.dpkg-new"
	fi
	mv $mvverbose -f "$CONFFILE.dpkg-backup" "$NEWCONFFILE"
}

if [ "$1" = configure ] && [ -n "$2" ] && dpkg --compare-versions "$2" lt 12.1.6; then
	finish_mv_conffile /etc/default/bsdmainutils /etc/default/calendar calendar
	finish_mv_conffile /etc/cron-daily/bsdmainutils /etc/cron.daily/calendar calendar
fi