#! /bin/sh -e

ETC_SSH_MODULI=@ETC_SSH_MODULI@

ETC_SSH_SSH_CONFIG=@ETC_SSH_SSH_CONFIG@

action="$1"
version="$2"

prepare_transfer_conffile () {
	CONFFILE="$1"
	TEXT="$2"
	MODE="$3"
	[ "$CONFFILES" ] || return 0
	[ -e "$CONFFILE" ] || return 0

	md5sum="$(md5sum "$CONFFILE" |sed -e 's/ .*//')"
	old_md5sum="$(echo "$CONFFILES" | awk '$1 == "'"$CONFFILE"'" { print $2 }')"
	if [ "$md5sum" = "$old_md5sum" ]; then
		echo >&2 "Transferring ownership of conffile $CONFFILE ..."
		# We have to write out the desired new text of the conffile,
		# which is tricky in the preinst, hence the nasty way we
		# have to hardcode the text here. Fortunately, this is only
		# necessary with sarge's dpkg and older.
		if echo "$TEXT" | head -n1 | grep -q '^@.*@$'; then
			echo >&2 'Unsubstituted conffile text! Please report this bug.'
			exit 1
		fi
		printf '%s' "$TEXT" >"$CONFFILE.dpkg-new"
		chmod "$MODE" "$CONFFILE.dpkg-new"
		mv -f "$CONFFILE" "$CONFFILE.moved-by-preinst"
		mv -f "$CONFFILE.dpkg-new" "$CONFFILE"
		return 0
	fi
}

case $action in
	install|upgrade)
		if dpkg --compare-versions "$version" lt 0; then
			CONFFILES="$(dpkg-query -W -f '${Conffiles}\n' ssh 2>/dev/null | sed 's/^ *//')"
			prepare_transfer_conffile /etc/ssh/moduli "$ETC_SSH_MODULI" 0644
			prepare_transfer_conffile /etc/ssh/ssh_config "$ETC_SSH_SSH_CONFIG" 0644
		fi
		;;
esac

#DEBHELPER#

exit 0