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

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

INITRAMFS=1

. /etc/preinit

set_state init
echo "- init -"

[ -n "$SWITCH_ROOT_TMPFS" ] && {
  mount none /mnt -t tmpfs
  ( cd /; find -xdev -type d ) | ( cd /mnt; xargs mkdir -p )
  find / \! -type d -xdev | tar -cT /proc/self/fd/0 | tar -xC /mnt
  mkdir /mnt/proc /mnt/dev /mnt/tmp /mnt/sys
  mount -o move /proc /mnt/proc
  mount -o move /dev /mnt/dev
  mount -o move /tmp /mnt/tmp
  mount -o move /sys /mnt/sys
  rm -rf /proc /dev /tmp /sys
  exec switch_root -c /dev/console /mnt /sbin/init
}

# 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
killall -q hotplug2
exec switch_root -c /dev/console /mnt /sbin/init

set_state done