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=($2*1024);print((s=mt/2)<l)?mt-l:s}' /proc/meminfo)
  24 mount tmpfs /tmp -t tmpfs -o size=$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         if [ -n "$INITRAMFS" ]; then
  36                 /sbin/hotplug2 --coldplug --no-persistent --max_children 1
  37                 /sbin/hotplug2 --persistent --max_children 1 &
  38         else
  39                 /sbin/hotplug2 --coldplug --set-rules-file /etc/hotplug2-init.rules
  40                 /sbin/hotplug2 --no-coldplug --persistent --set-rules-file /etc/hotplug2-init.rules &
  41         fi
  42         M0=/dev/ptmx
  43         M1=/dev/ptmx
  44         HOTPLUG=
  45
  46 elif [ -x /sbin/udevd ]; then
  47         mount -n -t tmpfs -o mode=0755 udev /dev
  48         /sbin/udevd --daemon
  49         /sbin/udevtrigger
  50         /sbin/udevsettle
  51         M0=/dev/pty/ptmx
  52         M1=/dev/pty/ptmx
  53         HOTPLUG=
  54 fi
  55
  56 mkdir -p /dev/pts /dev/shm
  57 mount devpts /dev/pts -t devpts
  58
  59 # the shell really doesn't like having stdin/out closed
  60 # that's why we use /dev/pty/m0 and m1 as replacement
  61 # for /dev/console if there's no serial console available
  62 dd if=/dev/console of=/dev/null bs=1 count=0 >/dev/null 2>/dev/null && {
  63         M0=/dev/console
  64         M1=/dev/console
  65 }
  66
  67 exec <$M0 >$M1 2>&0
  68
  69 echo "- preinit -"
  70 trap 'FAILSAFE=true' USR1
  71 [ -e /etc/preinit.arch ] && . /etc/preinit.arch
  72 set_state preinit
  73 echo "$HOTPLUG" > /proc/sys/kernel/hotplug
  74 eval ${FAILSAFE:+failsafe}
  75 lock -w /tmp/.failsafe
  76
  77 if [ -z "$INITRAMFS" ]; then
  78         mount_root
  79         [ -f /sysupgrade.tgz ] && {
  80                 echo "- config restore -"
  81                 cd /
  82                 mv sysupgrade.tgz /tmp
  83                 tar xzf /tmp/sysupgrade.tgz
  84                 rm -f /tmp/sysupgrade.tgz
  85                 sync
  86         }
  87
  88         echo "- init -"
  89
  90         killall hotplug2
  91         exec /sbin/init
  92 fi