- add tmpfs compatibility for older kernels

[packages/systemd.git] / start_udev

#!/bin/sh
#
# start_udev
#
# script to initialize /dev by using udev.
#
# Copyright (C) 2004 Greg Kroah-Hartman <greg@kroah.com>
#
# Released under the GPL v2 only.
#
# This needs to be run at the earliest possible point in the boot 
# process.
#
# Based on the udev init.d script
#
# Thanks go out to the Gentoo developers for proving 
# that this is possible to do.
#
# Yes, it's very verbose, feel free to turn off all of the echo calls,
# they were there to make me feel better that everything was working
# properly during development...

# default value, if no config present.
udev_root="/dev/"
sysfs_dir="/sys"
udevd_timeout=8

# don't use udev if sysfs is not mounted.
[ -d $sysfs_dir/class ] || exit 1
[ -r /proc/mounts ] || exit 1
[ -f /etc/udev/udev.conf ] && . /etc/udev/udev.conf

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

prog=udev
bin=/sbin/udev
udevd=/lib/udev/udevd

make_extra_nodes () {
	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 -m 600 /dev/$name $arg1 ;;
	        *) echo "links.conf: unparseable line ($type $name $arg1)" ;;
	    esac
	done
	[ -d /lib/udev/devices ] && cp -a /lib/udev/devices/* /dev/ >/dev/null 2>&1 || :
	[ -d /lib64/udev/devices ] && cp -a /lib64/udev/devices/* /dev/ >/dev/null 2>&1 || :
}

kill_udevd() {
	if [ -x /sbin/pidof ]; then
		pid=`/sbin/pidof -x udevd`
		[ -n "$pid" ] && kill $pid
	fi
}

set_hotplug_handler() {
    echo "" > /proc/sys/kernel/hotplug
}

export ACTION=add
prog=udev
ret=0
show "Starting udev"
busy

# mount the devtmpfs (tmpfs on older kernels) on ${udev_root%/}, if not already done
LANG=C awk "\$2 == \"${udev_root%/}\" && ( \$3 == \"tmpfs\" || \$3 == \"devtmpfs\" ) { exit 1 }" /proc/mounts && {
    	if LANG=C fgrep -q "none ${udev_root%/}/pts " /proc/mounts; then
    		PTSDIR=$(mktemp -d ${TMPDIR:-/tmp}/tmpXXXXXX)
		mount --move $udev_root/pts "$PTSDIR"
	fi
	if LANG=C fgrep -q "none ${udev_root%/}/shm " /proc/mounts; then
		SHMDIR=$(mktemp -d ${TMPDIR:-/tmp}/tmpXXXXXX)
		mount --move $udev_root/shm "$SHMDIR"
	fi
	if grep -qs devtmpfs /proc/filesystems; then
		mount -n -o mode=0755 -t devtmpfs devtmpfs "$udev_root"
	else
		mount -n -o mode=0755 -t tmpfs none "$udev_root"
	fi
	mkdir -m 0755 $udev_root/pts
	mkdir -m 0755 $udev_root/shm
	if [ -n "$PTSDIR" ]; then
		mount --move "$PTSDIR" $udev_root/pts
		rmdir "$PTSDIR"
	fi
	if [ -n "$SHMDIR" ]; then
		mount --move "$SHMDIR" $udev_root/shm
		rmdir "$SHMDIR"
	fi

	ret=$(( $ret + $? ))
}

kill_udevd > "$udev_root/null" 2>&1

	# Start udevd daemon
	$udevd --daemon
	ret=$(( $ret + $? ))
	
	# Making extra nodes
	make_extra_nodes
	ret=$(( $ret + $? ))
	
if [ -f "/sys/class/tty/console/uevent" ]; then

    	# Setting default hotplug handler
	set_hotplug_handler
	ret=$(( $ret + $? ))

	# retrigger all events
	# Udev find's it's own way of making this dir
	# and making it by hand makes udevsettle
	# work forever
	#mkdir -p /dev/.udev/queue
	udevadm trigger	
	ret=$(( $ret + $? ))
	
	# wait for the events to finish
	udevadm settle	
	ret=$(( $ret + $? ))
else
	echo "Kernel too old for this udev version"
fi

ret=$(( $ret + $? ))
[ $ret -eq 0 ] && ok || fail
exit 0