#! /bin/bash
#
# random	init script to setup /udev
#
# chkconfig: 2345 20 80
# description: manage user-space device nodes in /udev
#
# 2003-12-23: - some tweaks to run silently on a debian system
# 2003-12-30: - manage creation (and deletion) of /proc/self/fd->fd and 
#		fd/[0,1,2]->std[in,out,err] links
# 	      - creation and deletion of /proc/kcore->core link	
#	      - creation and deletion of /proc/asound/oss/sndstat->sndstat link 



udev_dir=/udev
sysfs_dir=/sys
bin=/sbin/udev

action () {
	if test $2 ; then
		echo $1
	else
		echo "Assertion $2 failed"
		echo "Aborting"
		exit 1
	fi
}

run_udev () {
	# handle block devices and their partitions
	for i in ${sysfs_dir}/block/*; do
		# add each drive
		export DEVPATH=${i#${sysfs_dir}}
		$bin block &

		# add each partition, on each device
		for j in $i/*; do
			if [ -f $j/dev ]; then
				export DEVPATH=${j#${sysfs_dir}}
				$bin block &
			fi
		done
	done
	# all other device classes
	for i in ${sysfs_dir}/class/*; do
		for j in $i/*; do
			if [ -f $j/dev ]; then
				export DEVPATH=${j#${sysfs_dir}}
				CLASS=`echo ${i#${sysfs_dir}} | \
					cut --delimiter='/' --fields=3-`
				$bin $CLASS &
			fi
		done
	done
}


case "$1" in
  start)
	if [ ! -d $udev_dir ]; then
		mkdir $udev_dir
	fi
	# don't use udev if sysfs is not mounted
	if [ ! -d $sysfs_dir/block ]; then
		exit 1
	fi
	# propogate /udev from /sys - we only need this while we do not
	# have initramfs and an early user-space with which to do early
	# device bring up
	action "Creating initial udev device nodes: " /bin/true
	export ACTION=add
	run_udev 

	# hack to create stdin node
	cd $udev_dir && ln -s /proc/self/fd fd
	cd $udev_dir && ln -s fd/0 stdin
	cd $udev_dir && ln -s fd/1 stdout
	cd $udev_dir && ln -s fd/2 stderr
	cd $udev_dir && ln -s /proc/kcore core
	cd $udev_dir && ln -s /proc/asound/oss/sndstat sndstat
	;;
  stop)
  	# be careful
	action "Removing udev device nodes: " /bin/true
	export ACTION=remove
	run_udev 
	rm -f $udev_dir/sndstat
	rm -f $udev_dir/core
	rm -f $udev_dir/stderr
	rm -f $udev_dir/stdout
	rm -f $udev_dir/stdin
	rm -f $udev_dir/fd
	;;
  status)
  	if [ -d $udev_dir ]; then
		echo "the udev device node directory exists"
	else
		echo "the udev device node directory does not exist"
	fi
	;;
  restart)
	$0 stop
	$0 start
	;;
  reload)
  	# nothing to do here
	;;
  *)
  	echo "Usage: $0 {start|stop|status|restart}"
	exit 1
esac

exit 0