config/mkinitcpio/start_udev

   1 #! /bin/sh
   2 #
   3 # start_udev
   4 # script to initialize /dev by using udev.
   5 #
   6 # Modified for Archlinux by Tobias Powalowski <tpowa@archlinux.org>
   7 #
   8 # Inspired by:
   9 #
  10 # Copyright (C) 2004 Greg Kroah-Hartman <greg@kroah.com>
  11 #
  12 # Released under the GPL v2 only.
  13 #
  14 # This needs to be run at the earliest possible point in the boot
  15 # process.
  16 #
  17 # Based on the udev init.d script
  18 #
  19 # Thanks go out to the Gentoo developers for proving
  20 # that this is possible to do.
  21 #
  22 # Yes, it's very verbose, feel free to turn off all of the echo calls,
  23 # they were there to make me feel better that everything was working
  24 # properly during development...
  25
  26 prog=udev
  27 sysfs_dir=/sys
  28 bin=/sbin/udev
  29 udevd=/sbin/udevd
  30 udev_root="/dev"
  31
  32 trigger_device_events ()
  33 {
  34         /sbin/udevtrigger
  35 }
  36
  37 wait_for_queue ()
  38 {
  39         # disabled because it hangs network boot
  40         #loop=20
  41         #while ! [ "$loop" -gt 0 -a -d /dev/.udev/queue ]; do
  42         #           sleep 0.1;
  43         #           loop=$(($loop - 1))
  44         #done
  45         /sbin/udevsettle
  46 }
  47
  48 make_extra_nodes ()
  49 {
  50         # there are a few things that sysfs does not export for us.
  51         # these things go here (and remember to remove them in
  52         # remove_extra_nodes()
  53         #
  54         # Thanks to Gentoo for the initial list of these.
  55         ln -sf /proc/self/fd $udev_root/fd
  56         ln -sf /proc/self/fd/0 $udev_root/stdin
  57         ln -sf /proc/self/fd/1 $udev_root/stdout
  58         ln -sf /proc/self/fd/2 $udev_root/stderr
  59         ln -sf /proc/kcore $udev_root/core
  60 }
  61
  62 udev_init  ()
  63 {
  64 # don't use udev if sysfs is not mounted.
  65 if [ ! -d $sysfs_dir/block ]; then
  66         exit 1
  67 fi
  68
  69 #echo "mounting... ramfs at $udev_root"
  70 mount -t ramfs none $udev_root
  71
  72 # propogate /udev from /sys
  73 #echo "Creating initial udev device nodes:"
  74
  75 #echo "making extra nodes"
  76 make_extra_nodes
  77
  78 # check if udevd is already running
  79 #echo "start udev daemon"
  80 /sbin/udevd --daemon
  81
  82 case "$(uname -r)" in
  83        2.6.[0-9]|2.6.[0-9][!0-9]*) ;;
  84        *)       if [ -f "/sys/class/tty/console/uevent" ]; then
  85                         #echo "Kernel >= 2.6.15 and supports uevents"
  86                         # trigger the sorted events
  87                         echo -e '\000\000\000\000' > /proc/sys/kernel/hotplug
  88                         # catch events that are real fast
  89                         mkdir -p /dev/.udev/queue
  90                 else
  91                         # for older kernels without uevents will be removed when udevstart dies in udev
  92                         echo "Kernel does not support uevents, you need a kernel >= 2.6.15!"
  93                         exit 1
  94                 fi
  95         ;;
  96 esac
  97 }
  98
  99 udev_uevents ()
 100 {
 101 # configure all devices
 102 trigger_device_events
 103 # until we know how to do better, just wait for _all_ events to finish
 104 wait_for_queue
 105 }
 106
 107 if [ $# -eq 0 ]; then
 108 udev_init
 109 udev_uevents
 110 fi
 111
 112 [ "$1" = "init" ] && udev_init
 113 [ "$1" = "uevents" ] && udev_uevents
 114
 115 exit 0