aports/main/udev/udev.initd

#!/sbin/runscript
# Copyright 1999-2010 Gentoo Foundation
# Distributed under the terms of the GNU General Public License v2

description="Run udevd and create the device-nodes"

[ -e /etc/udev/udev.conf ] && . /etc/udev/udev.conf

rc_coldplug=${rc_coldplug:-${RC_COLDPLUG:-YES}}

depend()
{
	provide dev
	if yesno "${rc_device_tarball:-no}"; then
		need sysfs udev-mount udev-dev-tarball
	else
		need sysfs udev-mount
	fi
	before checkfs fsck

	# udev does not work inside vservers
	keyword novserver nolxc
}

cleanup()
{
	# fail more gracely and not leave udevd running
	start-stop-daemon --stop --exec /sbin/udevd
	exit 1
}

disable_hotplug_agent()
{
	if [ -e /proc/sys/kernel/hotplug ]; then
		echo "" >/proc/sys/kernel/hotplug
	fi
}

root_link()
{
	/lib/udev/write_root_link_rule
}

rules_disable_switch()
{
	# this function disables rules files
	# by creating new files with the same name
	# in a temp rules directory with higher priority
	local f=/dev/.udev/rules.d/"$1" bname="$1" onoff="$2"

	if yesno "${onoff}"; then
		echo "# This file disables ${bname} due to /etc/conf.d/udev" \
			> "${f}"
	else
		rm -f "${f}"
	fi
}

start_udevd()
{
	# load unix domain sockets if built as module, Bug #221253 and not yet loaded, Bug #363549
	if [ ! -e /proc/net/unix ]; then
		if ! modprobe unix; then
			eerror "Cannot load the unix domain socket module"
		fi
	fi
	local opts="${udev_opts}"

	ebegin "Starting udevd"
	if yesno "${udev_debug:-no}"; then
		/sbin/udevd --daemon ${opts} --debug 2>/dev/.udev/udev.log
	else
		start-stop-daemon --start --exec /sbin/udevd -- --daemon ${opts}
	fi

	eend $?
}

# populate /dev with devices already found by the kernel
populate_dev()
{
	if get_bootparam "nocoldplug" ; then
		rc_coldplug="NO"
		ewarn "Skipping udev coldplug as requested in kernel cmdline"
	fi

	ebegin "Populating /dev with existing devices through uevents"
	udevadm control --property=STARTUP=1
	if yesno "${rc_coldplug}"; then
		udevadm trigger --action="add" --type="subsystems"
		udevadm trigger --action="add" --type="devices"
	else
		# Do not run any init-scripts, Bug #206518
		udevadm control --property=do_not_run_plug_service=1

		# only create device nodes
		udevadm trigger --action="add" --attr-match=dev

		# run persistent-net stuff, bug 191466
		udevadm trigger --action="add" --subsystem-match=net
	fi
	eend $?

	# we can speed up booting under these conditions:
	#  * using devtmpfs so kernel creates device nodes for us
	#  * only using kernel created device nodes at boot (in /etc/fstab and elsewhere)
	#
	ebegin "Waiting for uevents to be processed"
	udevadm settle --timeout=${udev_settle_timeout:-60}
	eend $?

	udevadm control --property=do_not_run_plug_service=
	udevadm control --property=STARTUP=
	return 0
}

# for debugging
start_udevmonitor()
{
	yesno "${udev_monitor:-no}" || return 0

	udevmonitor_log=/dev/.udev/udevmonitor.log
	udevmonitor_pid=/dev/.udev/udevmonitor.pid

	einfo "udev: Running udevadm monitor ${udev_monitor_opts} to get a log of all events"
	start-stop-daemon --start --stdout "${udevmonitor_log}" \
		--make-pidfile --pidfile "${udevmonitor_pid}" \
		--background --exec /sbin/udevadm -- monitor ${udev_monitor_opts}
}

stop_udevmonitor()
{
	yesno "${udev_monitor:-no}" || return 0

	if yesno "${udev_monitor_keep_running:-no}"; then
		ewarn "udev: udevmonitor is still running and writing into ${udevmonitor_log}"
	else
		einfo "udev: Stopping udevmonitor: Log is in ${udevmonitor_log}"
		start-stop-daemon --stop --pidfile "${udevmonitor_pid}" --exec /sbin/udevadm
	fi
}

display_hotplugged_services() {
	local svcfile= svc= services=
	for svcfile in "${RC_SVCDIR}"/hotplugged/*; do
		svc="${svcfile##*/}"
		[ -x "${svcfile}" ] || continue

		services="${services} ${svc}"
	done
	[ -n "${services}" ] && einfo "Device initiated services:${HILITE}${services}${NORMAL}"
}

check_persistent_net()
{
	# check if there are problems with persistent-net
	local syspath= devs= problem=false
	for syspath in /sys/class/net/*_rename*; do
		if [ -d "${syspath}" ]; then
			devs="${devs} ${syspath##*/}"
			problem=true
		fi
	done

	${problem} || return 0

	eerror "UDEV: Your system has a problem assigning persistent names"
	eerror "to these network interfaces: ${devs}"

	einfo "Checking persistent-net rules:"
	# the sed-expression lists all duplicate lines
	# from the input, like "uniq -d" does, but uniq
	# is installed into /usr/bin and not available at boot.
	dups=$(
	RULES_FILE='/etc/udev/rules.d/70-persistent-net.rules'
	. /lib/udev/rule_generator.functions
	find_all_rules 'NAME=' '.*' | \
	tr ' ' '\n' | \
	sort | \
	sed '$!N; s/^\(.*\)\n\1$/\1/; t; D'
	)
	if [ -n "${dups}" ]; then
		ewarn "The rules create multiple entries assigning these names:"
		eindent
		ewarn "${dups}"
		eoutdent
	else
		ewarn "Found no duplicate names in persistent-net rules,"
		ewarn "there must be some other problem!"
	fi
	return 1
}

check_udev_works()
{
	# should exist on every system, else udev failed
	if [ ! -e /dev/zero ]; then
		eerror "Assuming udev failed somewhere, as /dev/zero does not exist."
		return 1
	fi
	return 0
}

start()
{
	_start
	
	display_hotplugged_services

	return 0
}

_start()
{
	if [ ! -e /etc/runlevels/${RC_DEFAULTLEVEL:-default}/udev-postmount ]; then
		ewarn "You should add udev-postmount service to your default runlevel."
	fi

	root_link
	rules_disable_switch 75-persistent-net-generator.rules "${persistent_net_disable:-no}"
	rules_disable_switch 75-cd-aliases-generator.rules ${persistent_cd_disable:-no}
	
	disable_hotplug_agent
	start_udevd || cleanup
	start_udevmonitor
	populate_dev || cleanup

	check_persistent_net

	check_udev_works || cleanup
	stop_udevmonitor

	return 0
}

stop() {
	ebegin "Stopping udevd"
	start-stop-daemon --stop --exec /sbin/udevd
	eend $?
}