#! /bin/bash
#
# udev	init script to setup /udev
#
# description: manage user-space device nodes in /udev

. /etc/rc.d/init.d/functions

. /etc/udev/udev.conf
# strip trailling slash:
udev_root=/dev
udev_root2=${udev_root}.old

UDEVSTART=/sbin/udevstart
HELPERS_PATH=/lib/udev
sysfs_dir=/sys
# default maximum size of the /dev tmpfs
tmpfs_size="10M"

case "$(uname -r)" in
  2.[012345].*)
    echo "udev requires a 2.6.x kernel, not started."
    exit 1
    ;;
esac
# don't use udev if devfs is in use.
if [ -e $udev_root/.devfsd ]; then
    echo "devfsd used instead of udev!!!"
    exit 1
fi

# we need to unmount /dev/pts/ and remount it later over the tmpfs
unmount_devpts() {
  if grep -q $1/pts /proc/mounts; then
    umount -l $1/pts/
  fi

  if grep -q $1/shm /proc/mounts; then
    umount -l $1/shm/
  fi
}

# mount a tmpfs over /dev, if somebody did not already do it
mount_tmpfs() {
  if ! grep -E -q "^[^[:space:]]+ $udev_root tmpfs" /proc/mounts; then
      unmount_devpts $udev_root
      mount -n -o size=$tmpfs_size,mode=0755 -t tmpfs none $udev_root
  fi
  make_extra_nodes
  if ! grep -q $udev_root/pts /proc/mounts; then
      mount -n -t devpts -o mode=620 none $udev_root/pts
  fi
  if ! grep -q $udev_root/shm /proc/mounts; then
      mount -n -t tmpfs  none $udev_root/shm
  fi
}

make_node () {
    dev="$1"
    type="$2"
    major="$3"
    minor="$4"
    
    if [ "$type" = c -a ! -c "$dev" -o "$type" = b -a ! -b "$dev" ]; then
	rm -f "$dev"
	mknod "$dev" "$type" "$major" "$minor"
    fi
}

make_extra_nodes () {
	# there are a few things that sysfs does not export for us.
	# these things are listed in /etc/udev/links.conf
	 grep '^[^#]' /etc/udev/links.conf | \
	 while read type name arg1; do
	   [ "$type" -a "$name" -a ! -e "$udev_root/$name" -a ! -L "/dev/$name" ] ||continue
	   case "$type" in
	     L) ln -s $arg1 $udev_root/$name ;;
	     D) mkdir -p $udev_root/$name ;;
	     M) mknod --mode=600 $udev_root/$name $arg1 ;;
	     *) echo "links.conf: unparseable line ($type $name $arg1)" ;;
	   esac
	 done
}

# When modifying this script, do not forget that between the time that
# the new /dev has been mounted and udevstart has been run there will be
# no /dev/null. This also means that you cannot use the "&" shell command.

##############################################################################
case "$1" in
  start)
	fgrep -q '/dev ' /proc/mounts && [[ -e /$udev_root/.started ]] && exit 0
	# don't use udev if sysfs is not mounted.
	if [ ! -d $sysfs_dir/block ]; then
		echo not starting because /sys is not mounted
		exit 1
	fi
	if [ ! -d $udev_root ]; then
		mkdir $udev_root
	fi

	# we'd better handle this in an udev event:
	[[ -e /sys/class/firmware/timeout ]] && echo 50 > /sys/class/firmware/timeout

	# Creating initial udev device nodes:
	mount_tmpfs
	touch $udev_root/.started

	# udev uses a netlink, kernel.hotplug isn't needed
	echo "" > /proc/sys/kernel/hotplug
	udevd -d

	# propagate /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 (aka coldplug)
	PKLVL=$(cut -f1 /proc/sys/kernel/printk)
	sysctl -n -w kernel.printk=0
	$UDEVSTART
	sysctl -n -w kernel.printk=$PKLVL

	action "Start %s\n" udev /bin/true
	for i in /etc/udev/conf.d/*; do [[ "$i" = ${i%\~} ]] && [[ -x $i ]] && $i; done
	pam_console_apply
	;;
  stop)
	rm -f $udev_root/.started
  	exit 0
	;;
  force-stop)
	killall udevd
	[[ ! -d $udev_root2 ]] && mkdir $udev_root2
	mount --move $udev_root $udev_root2
	unmount_devpts $udev_root2
	# unmounting with -l should never fail
	action "Stopping %s" udev umount -l $udev_root2 2>/dev/null
	sysctl -n -w kernel.hotplug="/sbin/hotplug" >/dev/null 2>&1
	rmdir $udev_root2
	;;
  status)
	if [ -f $udev_root/.started ]; then
		action "%s is running\n" udev /bin/true
		exit 0
	fi
	action "%s is stopped\n" udev /bin/true
	exit 3
	;;
  restart)
	[[ -f $udev_root/.started ]] || exit 0
	$UDEVSTART
	pam_console_apply
	;;
  force-reload)
	$0 force-stop
	$0 start
	service syslog restart
	;;
  reload)
	$0 restart
	;;
  *)
  	echo "Usage: $0 {start|stop|status|restart|force-reload|force-stop}"
	exit 1
esac

exit 0