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 # default value, if no config present.
  24 udev_root="/dev/"
  25 sysfs_dir="/sys"
  26 udevd_timeout=8
  27
  28 # don't use udev if sysfs is not mounted.
  29 [ -d $sysfs_dir/class ] || exit 1
  30 [ -r /proc/mounts ] || exit 1
  31 [ -x /sbin/udev ] || exit 1
  32 [ -f /etc/udev/udev.conf ] && . /etc/udev/udev.conf
  33
  34 . /etc/rc.d/init.d/functions
  35
  36 prog=udev
  37 bin=/sbin/udev
  38 udevd=/sbin/udevd
  39 MAKEDEV="/sbin/MAKEDEV"
  40
  41 make_extra_nodes () {
  42         grep '^[^#]' /etc/udev/links.conf | \
  43         while read type name arg1; do
  44             [ "$type" -a "$name" -a ! -e "$udev_root/$name" -a ! -L "/dev/$name" ] ||continue
  45             case "$type" in
  46                 L) ln -s $arg1 $udev_root/$name ;;
  47                 D) mkdir -p $udev_root/$name ;;
  48                 M) mknod --mode=600 $udev_root/$name $arg1 ;;
  49                 *) echo "links.conf: unparseable line ($type $name $arg1)" ;;
  50             esac
  51         done
  52         cp -a /lib/udev/devices/* /dev/ >/dev/null 2>&1 || :
  53 }
  54
  55 kill_udevd() {
  56         if [ -x /sbin/pidof ]; then
  57                 pid=`/sbin/pidof -x udevd`
  58                 [ -n "$pid" ] && kill $pid
  59         fi
  60 }
  61
  62 # we cannot use /usr/bin/find here
  63 find_d () {
  64         where=$1
  65         what=$2
  66         found=""
  67         for f in $where/*; do
  68                 if [ -d "$f" -a ! -L "$f" ]; then
  69                         if [ "$f" != "${f%%$what}" ];then
  70                                 # make sure we are at the path end
  71                                 # we have no dirname and basename
  72                                 rest="${f#*$what}"
  73                                 [ "${rest##*/}" = "$rest" ] && found="$found $f"
  74                         fi
  75                         found="$found $(find_d $f $what)"
  76                 fi
  77         done
  78         echo "$found"
  79 }
  80
  81 # we cannot use /usr/bin/find here
  82 find_f () {
  83         where=$1
  84         what=$2
  85         found=""
  86         for f in $where/*; do
  87                 if [ -d "$f" -a ! -L "$f" ]; then
  88                         found="$found $(find_f $f $what)"
  89                 elif [ -e "$f" ]; then
  90                         [ "$where/" = "${f%$what}" ] && found="$found $f"
  91                 fi
  92         done
  93         [ -n "$found" ] && echo "$found"
  94 }
  95
  96 # call hotplug with the scsi devices
  97 scsi_replay () {
  98         HOTPLUG="/sbin/udevsend"
  99
 100         scsi_hosts=$(find_d /sys/devices host\*)
 101         SEQNUM=1
 102
 103         for host in $scsi_hosts; do
 104                 [ -d $host ] || continue
 105                 devs=$(find_f $host type)
 106                 for dev in $devs;do
 107                         [ -f $dev ] || continue
 108                         DEVPATH=${dev%/type}
 109                         DEVPATH=${DEVPATH#/sys}
 110                         /bin/env -i DEVPATH="$DEVPATH" SUBSYSTEM=scsi_device ACTION=add $HOTPLUG scsi_device
 111                         /bin/env -i DEVPATH="$DEVPATH" ACTION=add SUBSYSTEM=scsi $HOTPLUG scsi
 112                 done
 113         done
 114         return 0
 115 }
 116
 117 ide_scan() {
 118         if [ ! -d /proc/ide ]; then
 119                 return 1
 120         fi
 121         for i in /proc/ide/*/media; do
 122                 read media < "$i"
 123                 case "$media" in
 124                         disk)
 125                                 module=ide-disk
 126                         ;;
 127                         cdrom)
 128                                 module=ide-cd
 129                         ;;
 130                         tape)
 131                                 module=ide-tape
 132                         ;;
 133                         floppy)
 134                                 module=ide-floppy
 135                         ;;
 136                         *)
 137                                 module=ide-generic
 138                         ;;
 139                 esac
 140                 /sbin/modprobe $module
 141         done
 142         return 0
 143 }
 144
 145 supported_kernel() {
 146     case "$(uname -r)" in
 147     2.[012345].*) return 1 ;;
 148     esac
 149     return 0
 150 }
 151
 152 set_hotplug_handler() {
 153     echo /sbin/udevsend > /proc/sys/kernel/hotplug
 154 }
 155
 156 export ACTION=add
 157 prog=udev
 158 ret=0
 159 show "Starting udev"
 160 busy
 161
 162 if ! supported_kernel; then
 163     fail
 164     echo "udev requires a kernel >= 2.6.x, not started."
 165     exit 0
 166 fi
 167
 168 # mount the tmpfs on ${udev_root%/}, if not already done
 169 LANG=C awk "\$2 == \"${udev_root%/}\" && \$3 == \"tmpfs\" { exit 1 }" /proc/mounts && {
 170         if LANG=C fgrep -q "none ${udev_root%/}/pts " /proc/mounts; then
 171                 PTSDIR=$(mktemp -d ${TMPDIR:-/tmp}/tmpXXXXXX)
 172                 mount --move $udev_root/pts "$PTSDIR"
 173         fi
 174         if LANG=C fgrep -q "none ${udev_root%/}/shm " /proc/mounts; then
 175                 SHMDIR=$(mktemp -d ${TMPDIR:-/tmp}/tmpXXXXXX)
 176                 mount --move $udev_root/shm "$SHMDIR"
 177         fi
 178         mount -n -o mode=0755 -t tmpfs none "$udev_root"
 179         mkdir -m 0755 $udev_root/pts
 180         mkdir -m 0755 $udev_root/shm
 181         if [ -n "$PTSDIR" ]; then
 182                 mount --move "$PTSDIR" $udev_root/pts
 183                 rmdir "$PTSDIR"
 184         fi
 185         if [ -n "$SHMDIR" ]; then
 186                 mount --move "$SHMDIR" $udev_root/shm
 187                 rmdir "$SHMDIR"
 188         fi
 189
 190         ret=$(( $ret + $? ))
 191 }
 192
 193
 194 kill_udevd > "$udev_root/null" 2>&1
 195
 196 scsi_replay > "$udev_root/null" 2>&1
 197
 198 ret=$(( $ret + $? ))
 199
 200 ide_scan > "$udev_root/null" 2>&1
 201
 202 # Starting the hotplug events dispatcher
 203 /sbin/udevd --daemon
 204
 205 # Making extra nodes
 206 make_extra_nodes
 207
 208 # Setting default hotplug handler
 209 set_hotplug_handler
 210
 211 # Synthesizing the initial hotplug events
 212 /sbin/${UDEV_STARTER}
 213
 214 # wait for /dev to be fully populated
 215 while [ -d /dev/.udev/queue/ ]; do
 216     sleep 0.2
 217     udevd_timeout=$(($udevd_timeout - 1))
 218     if [ $udevd_timeout -eq 0 ]; then
 219         break
 220     fi
 221 done
 222
 223 # Start workaround for broken Linux input subsystem
 224 /lib/udev/udev_input_coldplug start
 225
 226 ret=$(( $ret + $? ))
 227 [ $ret -eq 0 ] && ok || fail
 228 exit 0