#!/bin/sh -e

action=$1
version=$2

prepare_mv_conffile () {
	CONFFILE="$1"
	[ -e "$CONFFILE" ] || return 0

	md5sum="$(md5sum "$CONFFILE" | sed -e 's/ .*//')"
	old_md5sum="$(dpkg-query -W -f '${Conffiles}\n' openssh-server 2>/dev/null | sed 's/^ *//' | awk '$1 == "'"$CONFFILE"'" { print $2 }')"
	if [ "$md5sum" = "$old_md5sum" ]; then
		mv -f "$CONFFILE" "$CONFFILE.dpkg-old"
	else
		mv -f "$CONFFILE" "$CONFFILE.moving"
	fi
}

if [ "$action" = upgrade ] || [ "$action" = install ]
then
  if dpkg --compare-versions "$version" lt 1:4.7p1-4; then
    prepare_mv_conffile /etc/pam.d/ssh
  fi

  if dpkg --compare-versions "$version" lt 1:5.5p1-6 && \
     [ -d /var/run/sshd ]; then
    # make sure /var/run/sshd is not removed on upgrades
    touch /var/run/sshd/.placeholder
  fi
fi

#DEBHELPER#