openwrt/target/linux/generic-2.6/base-files/init

#!/bin/sh
# Copyright (C) 2006 OpenWrt.org

. /etc/diag.sh
export PATH=/bin:/sbin:/usr/bin:/usr/sbin
mount none /proc -t proc
mount none /sys -t sysfs
size=$(awk '/MemTotal:/ {l=5242880;mt=($2*1024);print((s=mt/2)<l)?mt-l:s}' /proc/meminfo)
mount none /tmp -t tmpfs -o size=$size,nosuid,nodev,mode=1777

if grep devfs /proc/filesystems > /dev/null; then
	mount none /dev -t devfs

elif [ -x /sbin/hotplug2 ]; then
	mount -t tmpfs tmpfs /dev -o size=512K
	mknod /dev/console c 5 1
	mkdir /dev/pts
	mkdir /dev/shm
	/sbin/hotplug2 --no-persistent --coldplug --max_children 1

elif [ -x /sbin/udevd ]; then
	mount -n -t tmpfs -o mode=0755 udev /dev
	mkdir /dev/pts
	mkdir /dev/shm

	if [ -e /proc/sys/kernel/hotplug ]; then
		echo "" > /proc/sys/kernel/hotplug
	fi

	/sbin/udevd --daemon
	/sbin/udevtrigger
	/sbin/udevsettle

fi

mount none /dev/pts -t devpts

# the root mount point can come from the kernel command line
# or it can be overridden in the preinit.arch file
trap 'FAILSAFE=true' USR1
[ -e /etc/preinit.arch ] && . /etc/preinit.arch
set_state preinit
echo "$HOTPLUG" > /proc/sys/kernel/hotplug
eval ${FAILSAFE:+failsafe}
lock -w /tmp/.failsafe

# if we have no root parameter, just go to running from ramfs
[ -z $rootfs ] && {
  export NOMOUNT="No Root"
  exec /sbin/init
}

#if we have a failsafe boot selected, dont bother
#trying to find or wait for a root mount point
[ -z "$FAILSAFE" ] || {
  exec /bin/busybox init
}

# Load the modules we have in initramfs, this should
# make the media accessible, but, it may take some time
. /etc/functions.sh
load_modules /etc/modules /etc/modules.d/*

#wait 10 seconds for the disc to show up
#usb stick typically takes 4 to 6 seconds
#till it's readable
#it's quite possible the disc never shows up
#if we netbooted this kernel
COUNTER=0
while [ $COUNTER -lt 10 ]; do
  sleep 1
  [ -e $rootfs ] && let COUNTER=10;
  let COUNTER=COUNTER+1
done
[ -e $rootfs ] || {
  export FAILSAFE="NoDisc"
  exec /bin/busybox init
}

# now we'll try mount it, again with a timeout
# This will fail if the inserted stick is formatted
# in a manner we dont understand
COUNTER=0
while [ $COUNTER -lt 10 ]; do
  sleep 1
  mount $rootfs /mnt
  [ $? -eq "0" ] && let COUNTER=100;
  let COUNTER=COUNTER+1
done
[ $? -ne "0" ] && {
  export FAILSAFE="MountFail"
  exec /bin/busybox init
}

#It mounted, lets look for a postinit file, again, give it time
#I've seen this take 6 seconds to actually complete
COUNTER=0
while [ $COUNTER -lt 10 ]; do
  sleep 1
  [ -e /mnt/etc/banner ] && let COUNTER=10;
  let COUNTER=COUNTER+1
done
[ -e /mnt/etc/banner ] || {
  export FAILSAFE="No Openwrt FS"
  exec /bin/busybox init
}

unset rootfs

mount -o move /proc /mnt/proc
mount -o move /dev /mnt/dev
mount -o move /dev/pts /mnt/dev/pts
mount -o move /tmp /mnt/tmp
mount -o move /sys /mnt/sys
mount none /tmp -t tmpfs
exec switch_root -c /dev/console /mnt /sbin/init