mariadb: convert init script to procd

Also create a user "mariadb" and use it for running the server. And
add possibility to easily add command line args.

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

utils/mariadb/files/mysqld.init

@@ -1,32 +1,53 @@
 #!/bin/sh /etc/rc.common
-# Copyright (C) 2010-2011 OpenWrt.org
+# Copyright (C) 2010-2018 OpenWrt.org
 
 START=95
 STOP=10
 
-SERVICE_DAEMONIZE=1
-SERVICE_WRITE_PID=1
-SERVICE_STOP_TIME=9
-PROG='/usr/bin/mysqld'
+USE_PROCD=1
 
-start() {
+#PROCD_DEBUG=1
+
+MYSQLD=mysqld
+
+DEFAULT=/etc/default/$MYSQLD
+LOGGER="/usr/bin/logger -p user.err -s -t $MYSQLD"
+PROG=/usr/bin/$MYSQLD
+
+unset MY_ARGS MY_GROUP MY_USER
+
+[ -f $DEFAULT ] && . $DEFAULT
+
+my_user="${MY_USER:-mariadb}"
+my_group="${MY_GROUP:-mariadb}"
+
+start_service() {
 	local conf='/etc/mysql/my.cnf'
 	local datadir="$( 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"
+		$LOGGER "datadir '$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"
+		$LOGGER "cannot detect privileges table, you might need to"
+		$LOGGER "run 'mysql_install_db --force' to initialize the system tables"
 		return 1
 	}
 
-	service_start "$PROG"
-}
+	mkdir -p /var/lib/mysql
+	chown "$my_user":"$my_group" /var/lib/mysql
 
-stop() {
-	service_stop "$PROG"
+	mkdir -p /var/run/mysqld
+	chown "$my_user":"$my_group" /var/run/mysqld
+
+	procd_open_instance
+
+	procd_set_param command $PROG $MY_ARGS
+	procd_set_param pidfile /var/run/mysqld.pid
+	# forward stderr to logd
+	procd_set_param stderr 1
+
+	procd_close_instance
 }