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