#!/bin/sh -e
### BEGIN INIT INFO
# Provides:          udev
# Required-Start:    mountkernfs
# Required-Stop:
# Should-Start:
# Default-Start:     S
# Default-Stop:
# Short-Description: Start the udev daemon.
# Description:       Mounts the /dev virtual filesystem, starts the udev
#                    daemon and populates /dev.
### END INIT INFO

# Check the package is still installed
[ -x /sbin/udevd ] || exit 0

# Get LSB functions
. /lib/lsb/init-functions
. /etc/default/rcS


case "$1" in
start)
	# We need the uevent support introduced in 2.6.15, bail out if we
	# don't have it and fall back to a static /dev
	if [ ! -f /sys/class/mem/null/uevent ]; then
		if mountpoint -q /dev; then
			# uh-oh, initramfs made some kind of /dev, get rid of it
			umount -l /dev
		fi
		exit 1
	fi

	if ! mountpoint -q /dev; then
		# initramfs didn't mount /dev, so we'll need to do that
		mount -n -t tmpfs -o mode=0755 udev /dev
	fi

	# Copy over default device tree
	cp -a -u /lib/udev/devices/* /dev

	# It's all over netlink now
	if [ -e /proc/sys/kernel/hotplug ]; then
		echo "" > /proc/sys/kernel/hotplug
	fi
	
	# Start udevd
	log_begin_msg "Starting kernel event manager..."
	if start-stop-daemon --start --quiet --exec /sbin/udevd -- --daemon; then
		log_end_msg 0
	else
		log_end_msg $?
	fi

	# This next bit can take a while
	if type usplash_write >/dev/null 2>&1; then
		usplash_write "TIMEOUT 360" ||:
		trap "usplash_write 'TIMEOUT 15' ||:" 0
	fi

	# Log things that trigger does
	/sbin/udevadm monitor -e >/dev/.udev.log &
	UDEV_MONITOR_PID=$!

	# Fix permissions and missing symlinks/programs for devices made in
	# initramfs, and catch up on everything we missed
	log_begin_msg "Loading hardware drivers..."
	/sbin/udevadm trigger
	if /sbin/udevadm settle; then
		log_end_msg 0
	else
		log_end_msg $?
	fi

	# Kill the udev monitor again
	kill $UDEV_MONITOR_PID
	;;
stop)
	log_begin_msg "Stopping kernel event manager..."
	if start-stop-daemon --stop --quiet --oknodo --exec /sbin/udevd --retry 5; then
	    log_end_msg 0
	else
	    log_end_msg $?
	fi
	umount -l /dev
	;;
restart)
	if [ ! -f /sys/kernel/uevent_seqnum ]; then
		echo "Kernel uevent sequence number not available, cowardly not restarting udev" 1>&2
		exit 0
	fi

	seqnum_before=$(cat /sys/kernel/uevent_seqnum)

 	log_begin_msg "Stopping kernel event manager..."
	if start-stop-daemon --stop --quiet --oknodo --exec /sbin/udevd --retry 5; then
		log_end_msg 0
	else
		log_end_msg $?
	fi

	log_begin_msg "Starting kernel event manager..."
	if start-stop-daemon --start --quiet --exec /sbin/udevd -- --daemon; then
		log_end_msg 0
	else
		log_end_msg $?
	fi

	seqnum_after=$(cat /sys/kernel/uevent_seqnum)

	if [ $seqnum_before -ne $seqnum_after ]; then
		echo "Kernel uevent sequence number changed, some events may have been missed :o(" 1>&2
	fi
	;;
refresh-devices)
	cp -au /lib/udev/devices/* /dev

	log_begin_msg "Loading additional hardware drivers..."
	/sbin/udevadm trigger
	if /sbin/udevadm settle; then
		log_end_msg 0
	else
		log_end_msg $?
	fi
	;;
    reload|force-reload)
	log_begin_msg "Reloading kernel event manager..."
	if start-stop-daemon --stop --signal 1 --exec /sbin/udevd; then
		log_end_msg 0
	else
		log_end_msg $?
	fi
	;;
*)
	echo "Usage: /etc/init.d/udev {start|stop|restart|refresh-devices|reload|force-reload}"
	exit 1
	;;
esac

exit 0