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
  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         [ -a /dev/MAKEDEV ] || ln -s $MAKEDEV /dev/MAKEDEV
  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 -s $MAKEDEV /dev/MAKEDEV;
  63                 cp -a /etc/udev/devices/* /dev/ >/dev/null 2>&1 || :
  64         fi
  65 }
  66
  67 kill_udevd() {
  68         if [ -x /sbin/pidof ]; then
  69                 pid=`/sbin/pidof -x udevd`
  70                 [ -n "$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 export ACTION=add
 158 prog=udev
 159 ret=0
 160 nls "Starting udev"
 161
 162 # mount the tmpfs on ${udev_root%/}, if not already done
 163 LANG=C awk "\$2 == \"${udev_root%/}\" && \$3 == \"tmpfs\" { exit 1 }" /proc/mounts && {
 164         if LANG=C fgrep -q "none ${udev_root%/}/pts " /proc/mounts; then
 165                 PTSDIR=$(mktemp -d)
 166                 mount --move $udev_root/pts "$PTSDIR"
 167         fi
 168         if LANG=C fgrep -q "none ${udev_root%/}/shm " /proc/mounts; then
 169                 SHMDIR=$(mktemp -d)
 170                 mount --move $udev_root/shm "$SHMDIR"
 171         fi
 172         mount -n -o mode=0755 -t tmpfs none "$udev_root"
 173         mkdir -m 0755 $udev_root/pts
 174         mkdir -m 0755 $udev_root/shm
 175         if [ -n "$PTSDIR" ]; then
 176                 mount --move "$PTSDIR" $udev_root/pts
 177                 rmdir "$PTSDIR"
 178         fi
 179         if [ -n "$SHMDIR" ]; then
 180                 mount --move "$SHMDIR" $udev_root/shm
 181                 rmdir "$SHMDIR"
 182         fi
 183
 184         ret=$(( $ret + $? ))
 185 }
 186
 187 rm -fr "$udev_db"
 188 make_extra_nodes
 189 kill_udevd > "$udev_root/null" 2>&1
 190 scsi_replay > "$udev_root/null" 2>&1
 191 ret=$(( $ret + $? ))
 192 ide_scan > "$udev_root/null" 2>&1
 193 /sbin/udevstart
 194 ret=$(( $ret + $? ))
 195 [ $ret -eq 0 ] && ok || fail
 196 exit 0