#!/bin/sh
set -e

CLICKHOUSE_USER=clickhouse
CLICKHOUSE_GROUP=${CLICKHOUSE_USER}
CLICKHOUSE_DATADIR=/var/lib/clickhouse
CLICKHOUSE_DATADIR_OLD=/opt/clickhouse  # remove after 2017-06-01
CLICKHOUSE_LOGDIR=/var/log/clickhouse-server
CLICKHOUSE_SERVER_ETCDIR=/etc/clickhouse-server


if [ "$1" = configure ]; then

	if [ -x "/etc/init.d/clickhouse-server" ]; then
		update-rc.d clickhouse-server defaults 19 19 >/dev/null || exit $?
	fi

	# Make sure the administrative user exists
	if ! getent passwd ${CLICKHOUSE_USER} > /dev/null; then
		adduser --system --disabled-login --no-create-home --home /nonexistent \
			--shell /bin/false --group --gecos "Clickhouse server" clickhouse > /dev/null
	fi

	# if the user was created manually, make sure the group is there as well
	if ! getent group ${CLICKHOUSE_GROUP} > /dev/null; then
		addgroup --system ${CLICKHOUSE_GROUP} > /dev/null
	fi

	# make sure user is in the correct group
	if ! id -Gn ${CLICKHOUSE_USER} | grep -qw ${CLICKHOUSE_USER}; then
		adduser ${CLICKHOUSE_USER} ${CLICKHOUSE_GROUP} > /dev/null
	fi

	# check validity of user and group
	if [ "`id -u ${CLICKHOUSE_USER}`" -eq 0 ]; then
		echo "The ${CLICKHOUSE_USER} system user must not have uid 0 (root).
Please fix this and reinstall this package." >&2
		exit 1
	fi

	if [ "`id -g ${CLICKHOUSE_GROUP}`" -eq 0 ]; then
		echo "The ${CLICKHOUSE_USER} system user must not have root as primary group.
Please fix this and reinstall this package." >&2
		exit 1
	fi

	if [ ! -d ${CLICKHOUSE_DATADIR} ]; then
		# only for compatibility for old /opt/clickhouse, remove after 2017-06-01
		if [ -d ${CLICKHOUSE_DATADIR_OLD} ]; then
			ln -s ${CLICKHOUSE_DATADIR_OLD} ${CLICKHOUSE_DATADIR}
		else
			# DONT remove after 2017-06-01 :
			mkdir -p ${CLICKHOUSE_DATADIR}
			chown ${CLICKHOUSE_USER}:${CLICKHOUSE_GROUP} ${CLICKHOUSE_DATADIR}
			chmod 700 ${CLICKHOUSE_DATADIR}
		fi
	fi

	if [ ! -d ${CLICKHOUSE_LOGDIR} ]; then
		mkdir -p ${CLICKHOUSE_LOGDIR}
		chown root:${CLICKHOUSE_GROUP} ${CLICKHOUSE_LOGDIR}
		# Allow everyone to read logs, root and clickhouse to read-write
		chmod 775 ${CLICKHOUSE_LOGDIR}
	fi


	if [ -d ${CLICKHOUSE_LOGDIR} ]; then
		# only for compatibility for old metrika user, remove string after 2017-06-01 :
		su -s /bin/sh ${CLICKHOUSE_USER} -c "test -w ${CLICKHOUSE_LOGDIR}" || chown -R root:${CLICKHOUSE_GROUP} ${CLICKHOUSE_LOGDIR}; chmod -R ug+rw ${CLICKHOUSE_LOGDIR}
	fi


	if [ -d ${CLICKHOUSE_SERVER_ETCDIR} ]; then
		# -R only for compatibility for old metrika user, remove -R after 2017-06-01
		su -s /bin/sh ${CLICKHOUSE_USER} -c "test -w ${CLICKHOUSE_SERVER_ETCDIR}" || chown -R ${CLICKHOUSE_USER}:${CLICKHOUSE_GROUP} ${CLICKHOUSE_SERVER_ETCDIR}
	fi


	# Clean old dynamic compilation results
	if [ -d "${CLICKHOUSE_DATADIR}/build" ]; then
		rm -f ${CLICKHOUSE_DATADIR}/build/*.cpp ${CLICKHOUSE_DATADIR}/build/*.so ||:
	fi

fi