#!/bin/sh
# $Header: /root/magellan-cvs/src/busybox/mdev.rc,v 1.1 2010-08-22 16:43:06 niro Exp $

seed_dev()
{
	# seed /dev with some things that we know we need
	rc_print "  Seeding /dev with needed nodes ..."
	(
		[ ! -c /dev/console ] && mknod /dev/console c 5 1
		[ ! -c /dev/tty1 ] && mknod /dev/tty1 c 4 1
		[ ! -c /dev/null ] && mknod /dev/null c 1 3

		# create kmsg too, so udev can add its start-message to dmesg
		[ -c /dev/kmsg ] || mknod -m 660 /dev/kmsg c 1 11

		# copy over any persistant things
		if [[ -d /lib/udev/devices ]]
		then
			cp -RPp /lib/udev/devices/* /dev 2>/dev/null
		fi

		# not provided by sysfs but needed
		ln -snf /proc/self/fd /dev/fd
		ln -snf fd/0 /dev/stdin
		ln -snf fd/1 /dev/stdout
		ln -snf fd/2 /dev/stderr
		[[ -e /proc/kcore ]] && ln -snf /proc/kcore /dev/core

		# create problematic directories
		mkdir -p /dev/pts /dev/shm
	)
	evaluate_retval
}

# This works for 2.6.15 kernels or greater
trigger_uevents()
{
	local list=""
	local i
	local first
	local last
	local default

	# if you want real coldplug (with all modules being loaded for all
	# devices in the system), uncomment out the next line.
	#list="${lis}t $(echo /sys/bus/*/devices/*/uevent)"
	list="${list} $(echo /sys/class/*/*/uevent)"
	list="${list} $(echo /sys/block/*/uevent /sys/block/*/*/uevent)"
	for i in ${list}
	do
		case "${i}" in
			*/device/uevent)
				# skip followed device symlinks
				continue
				;;
			*/class/mem/*|*/class/tty/*)
				first="${first} ${i}"
				;;
			*/block/md*)
				last="${last} ${i}"
				;;
			*/*)
				default="${default} ${i}"
				;;
		esac
	done

	# trigger the sorted events
	for i in ${first} ${default} ${last}
	do
		echo "add" > "${i}"
	done
}

# main functions
start_devicemanager()
{
	# create a ramdisk for populating mdev
	rc_print "Mounting mdev at /dev ..."
	# many video drivers needed exec access
	fstype=ramfs
	# tmpfs was suggested by Greg Kroah-Hartman
	kernel_supports_fs tmpfs && fstype=tmpfs
	# mount devtmpfs if supported
	kernel_supports_fs devtmpfs && fstype=devtmpfs
	mount -n -t ${fstype} mdev /dev -o exec,nosuid,mode=0755,size=1024
	evaluate_retval

	# other eeded device nodes with udev
	seed_dev

	if [ -e /proc/sys/kernel/hotplug ]
	then
		rc_print "  Using mdev for hotplug events ..."
		echo "/sbin/mdev" > /proc/sys/kernel/hotplug
		evaluate_retval
	else
		rc_print ${COLYELLOW}"  Kernel was not compiled with hotplug support !"
		print_status failure
	fi

	# load unix domain sockets if built as module
	if [ -e /proc/modules ]
	then
		modprobe -q unix 2>/dev/null
	fi

	rc_print "  Populating /dev with existing devices through uevents ..."
	trigger_uevents

	rc_print "  Starting mdev ..."
	/sbin/mdev -s
	evaluate_retval

	# same thing as /dev/.devfsd
	touch /dev/.mdev
}

stop_devicemanager()
{
	return 0
}