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 udev_db="/dev/.udevdb"
  27 udevd_timeout=8
  28
  29 # don't use udev if sysfs is not mounted.
  30 [ -d $sysfs_dir/class ] || exit 1
  31 [ -r /proc/mounts ] || exit 1
  32 [ -x /sbin/udev ] || exit 1
  33 [ -f /etc/udev/udev.conf ] && . /etc/udev/udev.conf
  34
  35 . /etc/rc.d/init.d/functions
  36
  37 prog=udev
  38 bin=/sbin/udev
  39 udevd=/sbin/udevd
  40 MAKEDEV="/sbin/MAKEDEV"
  41
  42 make_extra_nodes () {
  43         ln -snf /proc/self/fd $udev_root/fd
  44         ln -snf /proc/self/fd/0 $udev_root/stdin
  45         ln -snf /proc/self/fd/1 $udev_root/stdout
  46         ln -snf /proc/self/fd/2 $udev_root/stderr
  47         ln -snf /proc/kcore $udev_root/core
  48
  49         [ -d $udev_root/pts ] || mkdir -m 0755 $udev_root/pts
  50         [ -d $udev_root/shm ] || mkdir -m 0755 $udev_root/shm
  51
  52         if [ -x $MAKEDEV ]; then
  53                 $MAKEDEV -x $(
  54                         for i in 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15; do
  55                             echo cpu/$i/microcode;
  56                         done;
  57                         for i in 1 2 3 4 5 6; do echo tty$i;done;
  58                         for i in 0 1 2 3 4 5 6 7; do echo loop$i; done;
  59                         for i in 0 1 2 3; do echo lp$i; echo parport$i;done;
  60                         echo net/tun ppp console null zero;
  61                 );
  62                 [ -a /dev/MAKEDEV ] || ln -sf "$MAKEDEV" /dev/MAKEDEV;
  63                 cp -a /etc/udev/devices/* /dev/ >/dev/null 2>&1 || :
  64         fi
  65 }
  66
  67 kill_udevd() {
  68         if [ -x /sbin/pidof ]; then
  69                 pid=`/sbin/pidof -x udevd`
  70                 [ -n "$pid" ] && kill $pid
  71         fi
  72 }
  73
  74 # we cannot use /usr/bin/find here
  75 find_d () {
  76         where=$1
  77         what=$2
  78         found=""
  79         for f in $where/*; do
  80                 if [ -d "$f" -a ! -L "$f" ]; then
  81                         if [ "$f" != "${f%%$what}" ];then
  82                                 # make sure we are at the path end
  83                                 # we have no dirname and basename
  84                                 rest="${f#*$what}"
  85                                 [ "${rest##*/}" = "$rest" ] && found="$found $f"
  86                         fi
  87                         found="$found $(find_d $f $what)"
  88                 fi
  89         done
  90         echo "$found"
  91 }
  92
  93 # we cannot use /usr/bin/find here
  94 find_f () {
  95         where=$1
  96         what=$2
  97         found=""
  98         for f in $where/*; do
  99                 if [ -d "$f" -a ! -L "$f" ]; then
 100                         found="$found $(find_f $f $what)"
 101                 elif [ -e "$f" ]; then
 102                         [ "$where/" = "${f%$what}" ] && found="$found $f"
 103                 fi
 104         done
 105         [ -n "$found" ] && echo "$found"
 106 }
 107
 108 # call hotplug with the scsi devices
 109 scsi_replay () {
 110         HOTPLUG="/sbin/udevsend"
 111
 112         scsi_hosts=$(find_d /sys/devices host\*)
 113         SEQNUM=1
 114
 115         for host in $scsi_hosts; do
 116                 [ -d $host ] || continue
 117                 devs=$(find_f $host type)
 118                 for dev in $devs;do
 119                         [ -f $dev ] || continue
 120                         DEVPATH=${dev%/type}
 121                         DEVPATH=${DEVPATH#/sys}
 122                         /bin/env -i DEVPATH="$DEVPATH" SUBSYSTEM=scsi_device ACTION=add $HOTPLUG scsi_device
 123                         /bin/env -i DEVPATH="$DEVPATH" ACTION=add SUBSYSTEM=scsi $HOTPLUG scsi
 124                 done
 125         done
 126         return 0
 127 }
 128
 129 ide_scan() {
 130         if [ ! -d /proc/ide ]; then
 131                 return 1
 132         fi
 133         for i in /proc/ide/*/media; do
 134                 read media < "$i"
 135                 case "$media" in
 136                         disk)
 137                                 module=ide-disk
 138                         ;;
 139                         cdrom)
 140                                 module=ide-cd
 141                         ;;
 142                         tape)
 143                                 module=ide-tape
 144                         ;;
 145                         floppy)
 146                                 module=ide-floppy
 147                         ;;
 148                         *)
 149                                 module=ide-generic
 150                         ;;
 151                 esac
 152                 /sbin/modprobe $module
 153         done
 154         return 0
 155 }
 156
 157 supported_kernel() {
 158     case "$(uname -r)" in
 159     2.[012345].*) return 1 ;;
 160     esac
 161     return 0
 162 }
 163
 164 set_hotplug_handler() {
 165     echo /sbin/udevsend > /proc/sys/kernel/hotplug
 166 }
 167
 168 export ACTION=add
 169 prog=udev
 170 ret=0
 171 nls "Starting udev"
 172
 173 if ! supported_kernel; then
 174     echo "udev requires a kernel >= 2.6.x, not started."
 175     exit 0
 176 fi
 177
 178 # mount the tmpfs on ${udev_root%/}, if not already done
 179 LANG=C awk "\$2 == \"${udev_root%/}\" && \$3 == \"tmpfs\" { exit 1 }" /proc/mounts && {
 180         if LANG=C fgrep -q "none ${udev_root%/}/pts " /proc/mounts; then
 181                 PTSDIR=$(mktemp -d ${TMPDIR:-/tmp}/tmpXXXXXX)
 182                 mount --move $udev_root/pts "$PTSDIR"
 183         fi
 184         if LANG=C fgrep -q "none ${udev_root%/}/shm " /proc/mounts; then
 185                 SHMDIR=$(mktemp -d ${TMPDIR:-/tmp}/tmpXXXXXX)
 186                 mount --move $udev_root/shm "$SHMDIR"
 187         fi
 188         mount -n -o mode=0755 -t tmpfs none "$udev_root"
 189         mkdir -m 0755 $udev_root/pts
 190         mkdir -m 0755 $udev_root/shm
 191         if [ -n "$PTSDIR" ]; then
 192                 mount --move "$PTSDIR" $udev_root/pts
 193                 rmdir "$PTSDIR"
 194         fi
 195         if [ -n "$SHMDIR" ]; then
 196                 mount --move "$SHMDIR" $udev_root/shm
 197                 rmdir "$SHMDIR"
 198         fi
 199
 200         ret=$(( $ret + $? ))
 201 }
 202
 203 rm -fr "$udev_db"
 204
 205
 206 kill_udevd > "$udev_root/null" 2>&1
 207
 208 scsi_replay > "$udev_root/null" 2>&1
 209
 210 ret=$(( $ret + $? ))
 211
 212 ide_scan > "$udev_root/null" 2>&1
 213
 214 # Starting the hotplug events dispatcher
 215 /sbin/udevd --daemon
 216
 217 # Making extra nodes
 218 make_extra_nodes
 219
 220 # Setting default hotplug handler
 221 set_hotplug_handler
 222
 223 # Synthesizing the initial hotplug events
 224 /sbin/${UDEV_STARTER}
 225
 226 # wait for the udev/udevd childs to finish
 227 while [ "$(grep -c -E '^Name:[[:space:]]*udevd?$' /proc/[0-9]*/status)" -gt 1 ]; do
 228     sleep 1
 229     udevd_timeout=$(($udevd_timeout - 1))
 230     if [ $udevd_timeout -eq 0 ]; then
 231         break
 232     fi
 233 done
 234
 235 # Start workaround for broken Linux input subsystem
 236 /sbin/udev_input_coldplug start
 237
 238 ret=$(( $ret + $? ))
 239 [ $ret -eq 0 ] && ok || fail
 240 exit 0