#!/bin/bash
# $Header: /root/magellan-cvs/src/udev/udev.rc,v 1.2 2010-08-18 00:57:31 niro Exp $

udev_version()
{
	local version=0

	if [[ -x /sbin/udev ]]
	then
		version=$(/sbin/udev -V)
		# We need it without a leading '0', else bash do the wrong thing
		version=${version##0}
		# Older udev's will print nothing
		[[ -z ${version} ]] && version=0
	elif [[ -x /sbin/udevd ]]
	then
		version=$(/sbin/udevd --version)
		version=${version##0}
		[[ -z ${version} ]] && version=0
	fi

	echo "${version}"
}

populate_udev()
{
	local opts

	# tell modprobe.sh to be verbose to $CONSOLE
	echo CONSOLE=${CONSOLE} > /dev/.udev_populate

	# populate /dev with devices already found by the kernel
	rc_print "  Populating /dev with existing devices through uevents ..."
	if [[ ${RC_COLDPLUG} = yes ]]
	then
		/sbin/udevadm trigger
	else
		# do not run any init-scripts
		/sbin/udevadm control --env do_not_run_plug_service=1

		# only create device nodes
		/sbin/udevadm trigger --attr-match=dev

		# run persistent-net stuff
		/sbin/udevadm trigger --subsystem-match=net
	fi
	evaluate_retval

	# loop until everything is finished
	rc_print "  Letting udev process events ..."
	/sbin/udevadm settle --timeout=60
	evaluate_retval

	# unset this variable
	/sbin/udevadm control --env do_not_run_plug_service=

	rm -f /dev/.udev_populate
	return 0
}

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
}

# main function
start_devicemanager()
{
	# check if /dev/console exists outside tmpfs
	[ -c /dev/console ] ; need_redirect=$?

	# create a ramdisk for populating udev
	rc_print "Mounting udev 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} udev /dev -o exec,nosuid,mode=0755,size=10M
	evaluate_retval

	# if a device tarball exists load it and if it is activated
	rc_print "Configurating system to use udev ..."
	if [[ ${RC_DEVICE_TARBALL} = yes ]]
	then
		rc_print "  Populating /dev with saved device nodes ..."
		tar -jxpf /lib/udev/state/devices.tar.bz2 -C /dev
		evaluate_retval
	fi

	# other eeded device nodes with udev
	seed_dev

	if [ -e /proc/sys/kernel/hotplug ]
	then
		rc_print "  Using netlink for hotplug events ..."
		echo "" > /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 "  Starting udevd daemon ..."
	if [ ${need_redirect} -eq 1 ]
	then
		# we need to open fds 0 1 2
		start-stop-daemon --start --exec /sbin/udevd -- --daemon </dev/console >/dev/console 2>/dev/console
	else
		start-stop-daemon --start --exec /sbin/udevd -- --daemon
	fi
	evaluate_retval

	# write root_link rule
	/lib/udev/write_root_link_rule
	# populate udev device nodes
	populate_udev

	# create nodes that udev can't
	rc_print "  Finializing udev configuration ..."
	[[ -x /sbin/dmsetup ]] && /sbin/dmsetup mknodes &>/dev/null
	[[ -x /sbin/lvm ]] && /sbin/lvm vgscan -P --mknodes --ignorelockingfailure &>/dev/null
	[[ -x /sbin/evms_activate ]] && /sbin/evms_activate -q &>/dev/null
	print_status success

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

stop_devicemanager()
{
	rc_print "Stopping udevd daemon ..."
	start-stop-daemon --stop --exec /sbin/udevd
	evaluate_retval
}