mariadb: new package

MariaDB is a drop-in replacement for MySQL. This commit adds a current
and stable version of MariaDB to the tree.

Quite a few ideas/patches were copied from Alpine Linux, Busybox Buildroot
and Debian.

Signed-off-by: Sebastian Kemper <sebastian_ml@gmx.net>

utils/mariadb/files/mysqld.init

@@ -0,0 +1,32 @@
+#!/bin/sh /etc/rc.common
+# Copyright (C) 2010-2011 OpenWrt.org
+
+START=95
+STOP=10
+
+SERVICE_DAEMONIZE=1
+SERVICE_WRITE_PID=1
+SERVICE_STOP_TIME=9
+PROG='/usr/bin/mysqld'
+
+start() {
+	local conf='/etc/my.cnf'
+	local datadir="$( sed -nE "s/^\s*datadir\s*=\s*('([^']*)'|\x22([^\x22]*)\x22|(.*\S))\s*$/\2\3\4/p" "$conf" )"
+
+	[ -d "$datadir" ] || {
+		logger -s "[ERROR] datadir '$datadir' in '$conf' does not exist"
+		return 1
+	}
+
+	[ -f "$datadir/mysql/tables_priv.MYD" ] || {
+		logger -s "[ERROR] can not detect privileges table, you might need to"
+		logger -s "run 'mysql_install_db --force' to initialize the system tables"
+		return 1
+	}
+
+	service_start "$PROG"
+}
+
+stop() {
+	service_stop "$PROG"
+}