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

   1 #!/bin/sh
   2 # Copyright (C) 2006 OpenWrt.org
   3
   4 export PATH=/bin:/sbin:/usr/bin:/usr/sbin
   5 mount none /proc -t proc
   6 mount none /sys -t sysfs
   7
   8 if grep devfs /proc/filesystems > /dev/null; then
   9         mount none /dev -t devfs
  10
  11 elif [ -x /sbin/hotplug2 ]; then
  12         mount -t tmpfs tmpfs /dev -o size=512K
  13         mknod /dev/console c 5 1
  14         mkdir /dev/pts
  15         mkdir /dev/shm
  16         /sbin/hotplug2 --no-persistent --coldplug --max_children 1
  17 fi
  18
  19 mount none /dev/pts -t devpts
  20
  21 # the root mount point can come from the kernel command line
  22 # or it can be overridden in the preinit.arch file
  23 [ -f /etc/preinit.arch ] && . /etc/preinit.arch
  24
  25 # if we have no root parameter, just go to running from ramfs
  26 [ -z $rootfs ] && {
  27   export NOMOUNT="No Root"
  28   exec /sbin/init
  29 }
  30
  31 #if we have a failsafe boot selected, dont bother
  32 #trying to find or wait for a root mount point
  33 [ -z "$FAILSAFE" ] || {
  34   exec /bin/busybox init
  35 }
  36
  37 # Load the modules we have in initramfs, this should
  38 # make the media accessible, but, it may take some time
  39 . /etc/functions.sh
  40 load_modules /etc/modules /etc/modules.d/*
  41
  42 #wait 10 seconds for the disc to show up
  43 #usb stick typically takes 4 to 6 seconds
  44 #till it's readable
  45 #it's quite possible the disc never shows up
  46 #if we netbooted this kernel
  47 COUNTER=0
  48 while [ $COUNTER -lt 10 ]; do
  49   sleep 1
  50   [ -e $rootfs ] && let COUNTER=10;
  51   let COUNTER=COUNTER+1
  52 done
  53 [ -e $rootfs ] || {
  54   export FAILSAFE="NoDisc"
  55   exec /bin/busybox init
  56 }
  57
  58 # now we'll try mount it, again with a timeout
  59 # This will fail if the inserted stick is formatted
  60 # in a manner we dont understand
  61 COUNTER=0
  62 while [ $COUNTER -lt 10 ]; do
  63   sleep 1
  64   mount $rootfs /mnt
  65   [ $? -eq "0" ] && let COUNTER=100;
  66   let COUNTER=COUNTER+1
  67 done
  68 [ $? -ne "0" ] && {
  69   export FAILSAFE="MountFail"
  70   exec /bin/busybox init
  71 }
  72
  73 #It mounted, lets look for a postinit file, again, give it time
  74 #I've seen this take 6 seconds to actually complete
  75 COUNTER=0
  76 while [ $COUNTER -lt 10 ]; do
  77   sleep 1
  78   [ -e /mnt/etc/banner ] && let COUNTER=10;
  79   let COUNTER=COUNTER+1
  80 done
  81 [ -e /mnt/etc/banner ] || {
  82   export FAILSAFE="No Openwrt FS"
  83   exec /bin/busybox init
  84 }
  85
  86 unset rootfs
  87
  88 mount -o move /proc /mnt/proc
  89 mount -o move /dev /mnt/dev
  90 mount -o move /dev/pts /mnt/dev/pts
  91 mount -o move /tmp /mnt/tmp
  92 mount -o move /sys /mnt/sys
  93 mount none /tmp -t tmpfs
  94 exec switch_root -c /dev/console /mnt /sbin/init