package/base-files/files/etc/preinit

   1 #!/bin/sh
   2 # Copyright (C) 2006 OpenWrt.org
   3 export PATH=/bin:/sbin:/usr/bin:/usr/sbin
   4 . /etc/diag.sh
   5
   6 failsafe() {
   7         lock /tmp/.failsafe
   8         ash --login
   9 }
  10
  11 mount none /proc -t proc
  12 mount none /sys  -t sysfs
  13
  14 size=$(awk '/MemTotal:/ {l=5242880;mt=($2*1024);print((s=mt/2)<l)?mt-l:s}' /proc/meminfo)
  15 mount none /tmp -t tmpfs -o size=$size,nosuid,nodev,mode=1777
  16
  17 if grep devfs /proc/filesystems > /dev/null; then
  18         mount none /dev -t devfs
  19         M0=/dev/pty/m0
  20         M1=/dev/pty/m1
  21         HOTPLUG=/sbin/hotplug-call
  22 else
  23         mount -t tmpfs tmpfs /dev -o size=512K
  24         mknod /dev/console c 5 1
  25         mkdir /dev/shm
  26         /sbin/hotplug2 --coldplug --set-rules-file /etc/hotplug2-init.rules
  27         /sbin/hotplug2 --no-coldplug --persistent --set-rules-file /etc/hotplug2-init.rules &
  28         M0=/dev/ptmx
  29         M1=/dev/ptmx
  30         HOTPLUG=
  31 fi
  32
  33 mkdir -p /dev/pts /dev/shm
  34 mount none /dev/pts -t devpts
  35
  36 # the shell really doesn't like having stdin/out closed
  37 # that's why we use /dev/pty/m0 and m1 as replacement
  38 # for /dev/console if there's no serial console available
  39 dd if=/dev/console of=/dev/null bs=1 count=0 >/dev/null 2>/dev/null && {
  40         M0=/dev/console
  41         M1=/dev/console
  42 }
  43
  44 exec <$M0 >$M1 2>&0
  45
  46 echo "- preinit -"
  47 trap 'FAILSAFE=true' USR1
  48 [ -e /etc/preinit.arch ] && . /etc/preinit.arch
  49 set_state preinit
  50 echo "$HOTPLUG" > /proc/sys/kernel/hotplug
  51 eval ${FAILSAFE:+failsafe}
  52 lock -w /tmp/.failsafe
  53 mount_root
  54
  55 echo "- init -"
  56
  57 killall hotplug2
  58 exec /sbin/init