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 "$ifname" /proc/net/dev >/dev/null && {
  12                 failsafe_ip
  13                 netmsg 192.168.1.255 "Entering Failsafe!"
  14                 telnetd -l /bin/login.sh <> /dev/null 2>&1
  15         }
  16         lock /tmp/.failsafe
  17         ash --login
  18 }
  19
  20 mount proc /proc -t proc
  21 mount sysfs /sys -t sysfs
  22
  23 size=$(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 --set-worker /lib/hotplug2/worker_fork.so --set-rules-file /etc/hotplug2-init.rules --no-persistent --set-coldplug-cmd /sbin/udevtrigger
  36         /sbin/hotplug2 --set-worker /lib/hotplug2/worker_fork.so --set-rules-file /etc/hotplug2-init.rules --persistent &
  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         [ -d /lib/udev/devices ] && cp -af /lib/udev/devices/* /dev/
  44         [ -c /dev/console ] || mknod -m 0600 /dev/console c 5 1
  45         [ -c /dev/null ] || mknod -m 0666 /dev/null c 1 3
  46         /sbin/udevd --daemon --resolve-names=never
  47         /sbin/udevadm trigger
  48         /sbin/udevadm settle
  49         M0=/dev/pty/ptmx
  50         M1=/dev/pty/ptmx
  51         HOTPLUG=
  52 fi
  53
  54 [ -d /dev/pts ] || mkdir -p /dev/pts
  55 [ -d /dev/shm ] || mkdir -p /dev/shm
  56 mount devpts /dev/pts -t devpts
  57
  58 # the shell really doesn't like having stdin/out closed
  59 # that's why we use /dev/pty/m0 and m1 as replacement
  60 # for /dev/console if there's no serial console available
  61 dd if=/dev/console of=/dev/null bs=1 count=0 >/dev/null 2>/dev/null && {
  62         M0=/dev/console
  63         M1=/dev/console
  64 }
  65
  66 exec <$M0 >$M1 2>&0
  67
  68 echo "- preinit -"
  69 echo "Press CTRL-C for failsafe"
  70 trap 'FAILSAFE=true' INT
  71 trap 'FAILSAFE=true' USR1
  72 [ -e /etc/preinit.arch ] && . /etc/preinit.arch
  73 set_state preinit
  74 echo "$HOTPLUG" > /proc/sys/kernel/hotplug
  75 export FAILSAFE
  76 eval ${FAILSAFE:+failsafe}
  77 lock -w /tmp/.failsafe
  78
  79 if [ -z "$INITRAMFS" ]; then
  80         mount_root
  81         [ -f /sysupgrade.tgz ] && {
  82                 echo "- config restore -"
  83                 cd /
  84                 mv sysupgrade.tgz /tmp
  85                 tar xzf /tmp/sysupgrade.tgz
  86                 rm -f /tmp/sysupgrade.tgz
  87                 sync
  88         }
  89
  90         echo "- init -"
  91
  92         exec /sbin/init
  93 fi