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
  18 elif [ -x /sbin/udevd ]; then
  19         mount -n -t tmpfs -o mode=0755 udev /dev
  20         mkdir /dev/pts
  21         mkdir /dev/shm
  22
  23         if [ -e /proc/sys/kernel/hotplug ]; then
  24                 echo "" > /proc/sys/kernel/hotplug
  25         fi
  26
  27         /sbin/udevd --daemon
  28         /sbin/udevtrigger
  29         /sbin/udevsettle
  30
  31 fi
  32
  33 mount none /dev/pts -t devpts
  34
  35 # the root mount point can come from the kernel command line
  36 # or it can be overridden in the preinit.arch file
  37 [ -f /etc/preinit.arch ] && . /etc/preinit.arch
  38
  39 # if we have no root parameter, just go to running from ramfs
  40 [ -z $rootfs ] && {
  41   export NOMOUNT="No Root"
  42   exec /sbin/init
  43 }
  44
  45 #if we have a failsafe boot selected, dont bother
  46 #trying to find or wait for a root mount point
  47 [ -z "$FAILSAFE" ] || {
  48   exec /bin/busybox init
  49 }
  50
  51 # Load the modules we have in initramfs, this should
  52 # make the media accessible, but, it may take some time
  53 . /etc/functions.sh
  54 load_modules /etc/modules /etc/modules.d/*
  55
  56 #wait 10 seconds for the disc to show up
  57 #usb stick typically takes 4 to 6 seconds
  58 #till it's readable
  59 #it's quite possible the disc never shows up
  60 #if we netbooted this kernel
  61 COUNTER=0
  62 while [ $COUNTER -lt 10 ]; do
  63   sleep 1
  64   [ -e $rootfs ] && let COUNTER=10;
  65   let COUNTER=COUNTER+1
  66 done
  67 [ -e $rootfs ] || {
  68   export FAILSAFE="NoDisc"
  69   exec /bin/busybox init
  70 }
  71
  72 # now we'll try mount it, again with a timeout
  73 # This will fail if the inserted stick is formatted
  74 # in a manner we dont understand
  75 COUNTER=0
  76 while [ $COUNTER -lt 10 ]; do
  77   sleep 1
  78   mount $rootfs /mnt
  79   [ $? -eq "0" ] && let COUNTER=100;
  80   let COUNTER=COUNTER+1
  81 done
  82 [ $? -ne "0" ] && {
  83   export FAILSAFE="MountFail"
  84   exec /bin/busybox init
  85 }
  86
  87 #It mounted, lets look for a postinit file, again, give it time
  88 #I've seen this take 6 seconds to actually complete
  89 COUNTER=0
  90 while [ $COUNTER -lt 10 ]; do
  91   sleep 1
  92   [ -e /mnt/etc/banner ] && let COUNTER=10;
  93   let COUNTER=COUNTER+1
  94 done
  95 [ -e /mnt/etc/banner ] || {
  96   export FAILSAFE="No Openwrt FS"
  97   exec /bin/busybox init
  98 }
  99
 100 unset rootfs
 101
 102 mount -o move /proc /mnt/proc
 103 mount -o move /dev /mnt/dev
 104 mount -o move /dev/pts /mnt/dev/pts
 105 mount -o move /tmp /mnt/tmp
 106 mount -o move /sys /mnt/sys
 107 mount none /tmp -t tmpfs
 108 exec switch_root -c /dev/console /mnt /sbin/init