#!/bin/bash

# Copyright (c) 2015, 2016, Oracle and/or its affiliates. All rights reserved.
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; version 2 of the License.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA

. /usr/share/debconf/confmodule

take_upstart_job_backup () {
	if [ -e "/etc/init/mysql.conf" ] && [ -d "/var/lib/mysql" ];
	then
		mv /etc/init/mysql.conf /var/lib/mysql/.mysql.conf.backup
	fi
}

# Runs an arbitrary init sql file supplied in $1. Does not require login access
run_init_sql() {
	tmpdir=$(mktemp -d)
	chown mysql:mysql "$tmpdir"
	mysqld --user=mysql --init-file="$1" --socket="$tmpdir/mysqld.sock" --pid-file="$tmpdir/mysqld.pid" > /dev/null 2>&1
	result=$?
	rm -rf "$tmpdir"
	return $result
}

# To avoid having hardcoded paths in the script, we do a search on the path, as suggested at:
# https://www.debian.org/doc/manuals/developers-reference/ch06.en.html#bpp-debian-maint-scripts
pathfind() {
	OLDIFS="$IFS"
	IFS=:
	for p in $PATH; do
		if [ -x "$p/$*" ]; then
			IFS="$OLDIFS"
			return 0
		fi
	done
	IFS="$OLDIFS"
	return 1
}

invoke() {
	if pathfind invoke-rc.d; then
		invoke-rc.d mysql
	else
		/etc/init.d/mysql $1
	fi
}
case "$1" in
	configure)

	if [ -z "$2" ];
	then

		set -e
		# If the existing config file is a proper file, we back it up
		if [ -f "/etc/mysql/my.cnf" ] && [ ! -L "/etc/mysql/my.cnf" ]; then
			cp /etc/mysql/my.cnf /etc/mysql/my.cnf.bak
		fi
		update-alternatives --force --install /etc/mysql/my.cnf my.cnf "/etc/mysql/mysql.cnf" 200

		MYSQLDATA=/var/lib/mysql
		MYSQLFILES=/var/lib/mysql-files
		if aa-status --enabled 2>/dev/null; then
			apparmor_parser -r -T -W /etc/apparmor.d/usr.sbin.mysqld 2>/dev/null || true
		fi
		if [ ! "$(ls -A ${MYSQLDATA})" ] && [ -d ${MYSQLFILES} ];
		then
			db_get mysql-community-server/root-pass && PASSWD=${RET}
			db_set mysql-community-server/root-pass ""
			db_set mysql-community-server/re-root-pass ""
			SQL=$(mktemp --tmpdir=/var/lib/mysql-files/)
			touch ${SQL}
			chmod 600 ${SQL}
			chown mysql:mysql ${SQL}
			if [ ! -z "${PASSWD}" ];
			then
				cat << EOF > ${SQL}
USE mysql;
ALTER user 'root'@'localhost' IDENTIFIED BY '${PASSWD}';
SHUTDOWN;
EOF
				PASSWD=""
			else
				cat << EOF > ${SQL}
USE mysql;
INSTALL PLUGIN auth_socket SONAME 'auth_socket.so';
ALTER USER 'root'@'localhost' IDENTIFIED WITH 'auth_socket';
SHUTDOWN;
EOF
			fi
			mysqld --initialize-insecure --user=mysql > /dev/null
			run_init_sql "$SQL"
			rm -f "$SQL"
		fi

		set +e

	fi

	;;

	abort-upgrade|abort-remove|abort-configure)

	;;

	*)
	exit 1
	;;
esac

db_stop

take_upstart_job_backup

#DEBHELPER#

exit 0
