extras/start_udev

   1 #! /bin/bash
   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         export UDEV_NO_SLEEP=1
  34
  35         # handle block devices and their partitions
  36         for i in ${sysfs_dir}/block/*; do
  37                 # add each drive
  38                 export DEVPATH=${i#${sysfs_dir}}
  39                 echo "$DEVPATH"
  40                 $bin block
  41
  42                 # add each partition, on each device
  43                 for j in $i/*; do
  44                         if [ -f $j/dev ]; then
  45                                 export DEVPATH=${j#${sysfs_dir}}
  46                                 echo "$DEVPATH"
  47                                 $bin block
  48                         fi
  49                 done
  50         done
  51         # all other device classes
  52         for i in ${sysfs_dir}/class/*; do
  53                 for j in $i/*; do
  54                         if [ -f $j/dev ]; then
  55                                 export DEVPATH=${j#${sysfs_dir}}
  56                                 CLASS=`echo ${i#${sysfs_dir}} | \
  57                                         cut --delimiter='/' --fields=3-`
  58                                 echo "$DEVPATH"
  59                                 $bin $CLASS
  60                         fi
  61                 done
  62         done
  63         return 0
  64 }
  65
  66 make_extra_nodes () {
  67         # there are a few things that sysfs does not export for us.
  68         # these things go here (and remember to remove them in
  69         # remove_extra_nodes()
  70         #
  71         # Thanks to Gentoo for the initial list of these.
  72         ln -snf /proc/self/fd $udev_root/fd
  73         ln -snf /proc/self/fd/0 $udev_root/stdin
  74         ln -snf /proc/self/fd/1 $udev_root/stdout
  75         ln -snf /proc/self/fd/2 $udev_root/stderr
  76         ln -snf /proc/kcore $udev_root/core
  77
  78         mkdir $udev_root/pts
  79         mkdir $udev_root/shm
  80 }
  81
  82 # don't use udev if sysfs is not mounted.
  83 if [ ! -d $sysfs_dir/block ]; then
  84         exit 1
  85 fi
  86
  87 echo "mounting... ramfs at $udev_root"
  88 mount -n -t ramfs none $udev_root
  89
  90 # propogate /udev from /sys
  91 echo "Creating initial udev device nodes:"
  92
  93 # You can use the shell scripts above by calling run_udev or execute udevstart
  94 # which does the same thing, but much faster by not using shell.
  95 #  only comment out one of the following lines.
  96 #run_udev
  97 /sbin/udevstart
  98
  99 echo "making extra nodes"
 100 make_extra_nodes
 101
 102 echo "udev startup is finished!"
 103 exit 0