busybox: mdev: do not daemonize udev

Follow the example set by Gentoo and Alpine and register mdev as the
hotplug agent in the beginning and then scan once.

recipes-appends/oe-core/busybox/busybox-mdev.confd

@@ -1,2 +1,2 @@
 # Extra arguments to pass to the daemon
-COMMAND_ARGS="-s -S"
+COMMAND_ARGS="-S"

recipes-appends/oe-core/busybox/busybox-mdev.initd

@@ -5,9 +5,24 @@ depend() {
 	before checkfs fsck
 }
 
-command_args="-df ${COMMAND_ARGS}"
-command_background="true"
-pidfile="/var/run/busybox-mdev.pid"
-command="/sbin/mdev"
+start() {
+	if [ -e /proc/sys/kernel/hotplug ]; then
+		ebegin "Registering mdev as hotplug agent"
+		echo "/sbin/mdev" > /proc/sys/kernel/hotplug
+		eend $?
+	fi
+
+	ebegin "Populating /dev with mdev"
+	/sbin/mdev -s ${COMMAND_ARGS}
+	eend $?
+}
+
+stop() {
+	if [ -e /proc/sys/kernel/hotplug ]; then
+		ebegin "Removing mdev as hotplug agent"
+		echo "/sbin/mdev" > /proc/sys/kernel/hotplug
+		eend $?
+	fi
+}
 
 # vim: noet ft=gentoo-init-d