#!/bin/sh
set -e

# Revert relocation of a conffile from one location to another.
# The forward path is preinst install|upgrade.
# $1 is the original pathname of the conffile,
# $2 is the pathname of the current conffile.
unmv_conffile ()
{
	if [ -e "$1" ] ; then
		echo "Not reverting conffile relocation to $2;"
		echo "original pathname $1 exists."
	elif [ -e "$1.moved_by_preinst" ] ; then
		echo "Reverting removal of unmodified conffile:"
		echo -n " "
		mv -v "$1.moved_by_preinst" "$1"
	elif  [ -e "$2" ] ; then
		echo "Reverting relocation of modified conffile to original location:"
		echo -n " "
		mv -fv $2 $1
	fi >&2
}

case $1 in
disappear|remove)
	# These are the restore and cracked-password file used by the
	# cronjob for attacking the system password file for a short
	# period each day:
	d=/var/lib/john
	rm -f $d/restore $d/john.pot
	d=/var/run/john
# FIXME: this is configurable...
	rm -f "$d/john.pid $d/cronpasswd.*"
	;;

abort-install|abort-upgrade)
	# Revert relocation of conffiles:
	p1=/etc
	p2=/etc/john
	if dpkg --compare-versions "$2" le-nl 1.6-27; then
		unmv_conffile $p1/john.ini $p2/john.conf
		unmv_conffile $p1/john-mail.conf $p2/john-mail.conf
		unmv_conffile $p1/john-mail.msg $p2/john-mail.msg

		# "Display the warning, but don't fail if nonempty":
		rmdir $p2 || rmdir --ignore-fail-on-non-empty $p2
	fi
	;;

purge)
	rmdir -pv /var/lib/john /var/run/john || true
	;;

purge|upgrade|failed-upgrade)
	# These cases need no actions here
	:
	;;

*)
	echo "$0: undocumented call: $@" >&2
	exit 1
	;;
esac