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_ip() {
   7         ifconfig $ifname 192.168.1.1 netmask 255.255.255.0 broadcast 192.168.1.255 up
   8 }
   9
  10 failsafe() {
  11         [ -n "$ifname" ] && grep "$ifname" /proc/net/dev >/dev/null && {
  12                 failsafe_ip
  13                 netmsg 192.168.1.255 "Entering Failsafe!"
  14                 telnetd -l /bin/login <> /dev/null 2>&1
  15         }
  16         lock /tmp/.failsafe
  17         ash --login
  18 }
  19
  20 mount proc /proc -t proc
  21 mount sysfs /sys -t sysfs
  22
  23 size=$(awk '/MemTotal:/ {l=5242880;mt=($2*1024);print((s=mt/2)<l)&&(mt>l)?mt-l:s}' /proc/meminfo)
  24 mount tmpfs /tmp -t tmpfs -o size=$size,nosuid,nodev,mode=1777
  25
  26 if grep devfs /proc/filesystems > /dev/null; then
  27         mount devfs /dev -t devfs
  28         M0=/dev/pty/m0
  29         M1=/dev/pty/m1
  30         HOTPLUG=/sbin/hotplug-call
  31
  32 elif [ -x /sbin/hotplug2 ]; then
  33         mount -t tmpfs tmpfs /dev -o size=512K
  34         mknod /dev/console c 5 1
  35         /sbin/hotplug2 --coldplug --set-rules-file /etc/hotplug2-init.rules
  36         /sbin/hotplug2 --no-coldplug --persistent --set-rules-file /etc/hotplug2-init.rules &
  37         M0=/dev/ptmx
  38         M1=/dev/ptmx
  39         HOTPLUG=
  40
  41 elif [ -x /sbin/udevd ]; then
  42         mount -n -t tmpfs -o mode=0755 udev /dev
  43         /sbin/udevd --daemon
  44         /sbin/udevtrigger
  45         /sbin/udevsettle
  46         M0=/dev/pty/ptmx
  47         M1=/dev/pty/ptmx
  48         HOTPLUG=
  49 fi
  50
  51 mkdir -p /dev/pts /dev/shm
  52 mount devpts /dev/pts -t devpts
  53
  54 # the shell really doesn't like having stdin/out closed
  55 # that's why we use /dev/pty/m0 and m1 as replacement
  56 # for /dev/console if there's no serial console available
  57 dd if=/dev/console of=/dev/null bs=1 count=0 >/dev/null 2>/dev/null && {
  58         M0=/dev/console
  59         M1=/dev/console
  60 }
  61
  62 exec <$M0 >$M1 2>&0
  63
  64 echo "- preinit -"
  65 echo "Press CTRL-C for failsafe"
  66 trap 'FAILSAFE=true' INT
  67 trap 'FAILSAFE=true' USR1
  68 [ -e /etc/preinit.arch ] && . /etc/preinit.arch
  69 set_state preinit
  70 echo "$HOTPLUG" > /proc/sys/kernel/hotplug
  71 export FAILSAFE
  72 eval ${FAILSAFE:+failsafe}
  73 lock -w /tmp/.failsafe
  74
  75 if [ -z "$INITRAMFS" ]; then
  76         mount_root
  77         [ -f /sysupgrade.tgz ] && {
  78                 echo "- config restore -"
  79                 cd /
  80                 mv sysupgrade.tgz /tmp
  81                 tar xzf /tmp/sysupgrade.tgz
  82                 rm -f /tmp/sysupgrade.tgz
  83                 sync
  84         }
  85
  86         echo "- init -"
  87
  88         exec /sbin/init
  89 fi