extras/start_udev

   1 #! /bin/sh
   2 #
   3 # start_udev
   4 #
   5 # script to initialize /dev by using udev.
   6 #
   7 # Copyright (C) 2004 Greg Kroah-Hartman <greg@kroah.com>
   8 #
   9 # Released under the GPL v2 only.
  10 #
  11 # This needs to be run at the earliest possible point in the boot
  12 # process.
  13 #
  14 # Based on the udev init.d script
  15 #
  16 # Thanks go out to the Gentoo developers for proving
  17 # that this is possible to do.
  18 #
  19 # Yes, it's very verbose, feel free to turn off all of the echo calls,
  20 # they were there to make me feel better that everything was working
  21 # properly during development...
  22 #
  23
  24 . /etc/udev/udev.conf
  25
  26 prog=udev
  27 sysfs_dir=/sys
  28 bin=/sbin/udev
  29 udevd=/sbin/udevd
  30
  31 run_udev () {
  32         export ACTION=add
  33
  34         # handle block devices and their partitions
  35         for i in ${sysfs_dir}/block/*; do
  36                 # add each drive
  37                 export DEVPATH=${i#${sysfs_dir}}
  38                 echo "$DEVPATH"
  39                 $bin block
  40
  41                 # add each partition, on each device
  42                 for j in $i/*; do
  43                         if [ -f $j/dev ]; then
  44                                 export DEVPATH=${j#${sysfs_dir}}
  45                                 echo "$DEVPATH"
  46                                 $bin block
  47                         fi
  48                 done
  49         done
  50         # all other device classes
  51         for i in ${sysfs_dir}/class/*; do
  52                 for j in $i/*; do
  53                         if [ -f $j/dev ]; then
  54                                 export DEVPATH=${j#${sysfs_dir}}
  55                                 CLASS=`echo ${i#${sysfs_dir}} | \
  56                                         cut --delimiter='/' --fields=3-`
  57                                 echo "$DEVPATH"
  58                                 $bin $CLASS
  59                         fi
  60                 done
  61         done
  62         return 0
  63 }
  64
  65 make_extra_nodes () {
  66         # there are a few things that sysfs does not export for us.
  67         # these things go here (and remember to remove them in
  68         # remove_extra_nodes()
  69         #
  70         # Thanks to Gentoo for the initial list of these.
  71         ln -snf /proc/self/fd $udev_root/fd
  72         ln -snf /proc/self/fd/0 $udev_root/stdin
  73         ln -snf /proc/self/fd/1 $udev_root/stdout
  74         ln -snf /proc/self/fd/2 $udev_root/stderr
  75         ln -snf /proc/kcore $udev_root/core
  76
  77         mkdir $udev_root/pts
  78         mkdir $udev_root/shm
  79 }
  80
  81 # don't use udev if sysfs is not mounted.
  82 if [ ! -d $sysfs_dir/block ]; then
  83         exit 1
  84 fi
  85
  86 echo "mounting... ramfs at $udev_root"
  87 mount -n -t ramfs none $udev_root
  88
  89 # propogate /udev from /sys
  90 echo "Creating initial udev device nodes:"
  91
  92 # You can use the shell scripts above by calling run_udev or execute udevstart
  93 # which does the same thing, but much faster by not using shell.
  94 #  only comment out one of the following lines.
  95 #run_udev
  96 /sbin/udevstart
  97
  98 echo "making extra nodes"
  99 make_extra_nodes
 100
 101 echo "udev startup is finished!"
 102 exit 0