linuxrc

linux下从网卡远程启动

#!/bin/sh
# $Id: linuxrc,v 1.1 2002/11/06 06:30:10 ken_yap Exp $

PATH=/sbin:/bin

echo Busybox /linuxrc starting

echo Mounting /proc filesystem
mount -t proc none /proc

echo=echo
if grep '\bquiet\b' /proc/cmdline > /dev/null; then
  echo=true
  quiet=1
fi

$echo Creating root device
mknod /dev/root b 1 0 2>/dev/null
chmod 700 /dev/root
echo 0x100 > /proc/sys/kernel/real-root-dev

$echo Inserting modules
if [ -z "$quiet" ]; then
  /bin/insert-modules
else
  /bin/insert-modules >/dev/null
fi

$echo Bringing up loopback interface
ifconfig lo 127.0.0.1 up
route add -net 127.0.0.0 netmask 255.0.0.0 lo

# Hack required for prism2 cards
# It is not yet possible to use iwconfig to configure these cards,
# so we need wlanctl.
if ifconfig wlan0 down 2> /dev/null; then
  $echo Setting up wireless link
  wlanctl wlan0 lnxreq_ifstate ifstate=enable
  wlanctl wlan0 lnxreq_autojoin ssid= authtype=opensystem
fi

$echo Obtaining IP address via DHCP
$echo Trying to obtain IP address via wired link [eth0]
if udhcpc -i eth0 -f -n -q -s /bin/udhcpc-post; then
  $echo Successfully obtained IP address via wired link [eth0]
else
  $echo Failed to obtain IP address via wired link [eth0]
  $echo Trying to obtain IP address via wireless link [wlan0]
  udhcpc -i wlan0 -f -n -q -s /bin/udhcpc-post
fi

if [ -d /sysroot/initrd ]; then
  $echo Unmounting /proc prior to pivot_root
  umount /proc

  $echo Pivoting root to /sysroot
  pivot_root /sysroot /sysroot/initrd
  cd /

  $echo Remounting devfs at correct place
  mount -t devfs none /dev

  $echo Releasing locks on old devfs
  exec 0</dev/null
  exec 1>/dev/console
  exec 2>/dev/console

  $echo Unmounting old devfs
  umount /initrd/dev
else
  # Failed to mount root: report error and hang
  echo FATAL ERROR: Failed to mount root filesystem
  echo Press Alt-SysRq-B or hit the reset switch to reboot
  while : ; do sleep 6000 ; done
fi