#!/bin/sh

start()
{
	printf 'Mounting kernel virtual file systems... '
	[ ! -e /proc/mounts ] && mount -t proc -o nodev,noexec,nosuid proc /proc
	[ ! -e /sys/kernel ] && mount -t sysfs -o nodev,noexec,nosuid sysfs /sys
	printf 'done.\n'
}

stop()
{
	printf 'Unmounting kernel virtual file systems... '
	[ -e /proc/mounts ] && umount /proc
	[ -e /sys/kernel ] && umount /sys
	printf 'done.\n'
}

case "${1}" in
	start)
		start
		;;
	stop)
		stop
		;;
	*)
		printf 'Usage: %s {start|stop}\n' "${0}" >&2
		exit 1
		;;
esac