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|
#! /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...
#
. /etc/udev/udev.conf
prog=udev
sysfs_dir=/sys
bin=/sbin/udev
udevd=/sbin/udevd
run_udev () {
export ACTION=add
# handle block devices and their partitions
for i in ${sysfs_dir}/block/*; do
# add each drive
export DEVPATH=${i#${sysfs_dir}}
echo "$DEVPATH"
$bin block
# add each partition, on each device
for j in $i/*; do
if [ -f $j/dev ]; then
export DEVPATH=${j#${sysfs_dir}}
echo "$DEVPATH"
$bin block
fi
done
done
# all other device classes
for i in ${sysfs_dir}/class/*; do
for j in $i/*; do
if [ -f $j/dev ]; then
export DEVPATH=${j#${sysfs_dir}}
CLASS=`echo ${i#${sysfs_dir}} | \
cut --delimiter='/' --fields=3-`
echo "$DEVPATH"
$bin $CLASS
fi
done
done
return 0
}
make_extra_nodes () {
# there are a few things that sysfs does not export for us.
# these things go here (and remember to remove them in
# remove_extra_nodes()
#
# Thanks to Gentoo for the initial list of these.
ln -snf /proc/self/fd $udev_root/fd
ln -snf /proc/self/fd/0 $udev_root/stdin
ln -snf /proc/self/fd/1 $udev_root/stdout
ln -snf /proc/self/fd/2 $udev_root/stderr
ln -snf /proc/kcore $udev_root/core
mkdir $udev_root/pts
mkdir $udev_root/shm
}
# don't use udev if sysfs is not mounted.
if [ ! -d $sysfs_dir/block ]; then
echo "error: sysfs not mounted"
exit 1
fi
echo "mounting... ramfs at $udev_root"
mount -n -t ramfs none $udev_root
# propogate /udev from /sys
echo "creating initial udev device nodes:"
# You can use the shell scripts above by calling run_udev or execute udevstart
# which does the same thing, but much faster by not using shell.
# only comment out one of the following lines.
#run_udev
/sbin/udevstart
echo "making extra nodes"
make_extra_nodes
echo /sbin/udevsend > /proc/sys/kernel/hotplug
if [ -f "$udevd" ]; then
$udevd &
fi
# We can only mount /dev/pts after initialising udev
mount /dev/pts
echo "udev startup is finished"
exit 0
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