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

   1 #!/bin/sh
   2 # Copyright (C) 2006 OpenWrt.org
   3
   4 . /etc/diag.sh
   5 export PATH=/bin:/sbin:/usr/bin:/usr/sbin
   6 mount none /proc -t proc
   7 mount none /sys -t sysfs
   8 size=$(awk '/MemTotal:/ {l=5242880;mt=($2*1024);print((s=mt/2)<l)?mt-l:s}' /proc/meminfo)
   9 mount none /tmp -t tmpfs -o size=$size,nosuid,nodev,mode=1777
  10
  11 if grep devfs /proc/filesystems > /dev/null; then
  12         mount none /dev -t devfs
  13
  14 elif [ -x /sbin/hotplug2 ]; then
  15         mount -t tmpfs tmpfs /dev -o size=512K
  16         mknod /dev/console c 5 1
  17         mkdir /dev/pts
  18         mkdir /dev/shm
  19         /sbin/hotplug2 --no-persistent --coldplug --max_children 1
  20
  21 elif [ -x /sbin/udevd ]; then
  22         mount -n -t tmpfs -o mode=0755 udev /dev
  23         mkdir /dev/pts
  24         mkdir /dev/shm
  25
  26         if [ -e /proc/sys/kernel/hotplug ]; then
  27                 echo "" > /proc/sys/kernel/hotplug
  28         fi
  29
  30         /sbin/udevd --daemon
  31         /sbin/udevtrigger
  32         /sbin/udevsettle
  33
  34 fi
  35
  36 mount none /dev/pts -t devpts
  37
  38 # the root mount point can come from the kernel command line
  39 # or it can be overridden in the preinit.arch file
  40 trap 'FAILSAFE=true' USR1
  41 [ -e /etc/preinit.arch ] && . /etc/preinit.arch
  42 set_state preinit
  43 echo "$HOTPLUG" > /proc/sys/kernel/hotplug
  44 eval ${FAILSAFE:+failsafe}
  45 lock -w /tmp/.failsafe
  46
  47 # if we have no root parameter, just go to running from ramfs
  48 [ -z $rootfs ] && {
  49   export NOMOUNT="No Root"
  50   exec /sbin/init
  51 }
  52
  53 #if we have a failsafe boot selected, dont bother
  54 #trying to find or wait for a root mount point
  55 [ -z "$FAILSAFE" ] || {
  56   exec /bin/busybox init
  57 }
  58
  59 # Load the modules we have in initramfs, this should
  60 # make the media accessible, but, it may take some time
  61 . /etc/functions.sh
  62 load_modules /etc/modules /etc/modules.d/*
  63
  64 #wait 10 seconds for the disc to show up
  65 #usb stick typically takes 4 to 6 seconds
  66 #till it's readable
  67 #it's quite possible the disc never shows up
  68 #if we netbooted this kernel
  69 COUNTER=0
  70 while [ $COUNTER -lt 10 ]; do
  71   sleep 1
  72   [ -e $rootfs ] && let COUNTER=10;
  73   let COUNTER=COUNTER+1
  74 done
  75 [ -e $rootfs ] || {
  76   export FAILSAFE="NoDisc"
  77   exec /bin/busybox init
  78 }
  79
  80 # now we'll try mount it, again with a timeout
  81 # This will fail if the inserted stick is formatted
  82 # in a manner we dont understand
  83 COUNTER=0
  84 while [ $COUNTER -lt 10 ]; do
  85   sleep 1
  86   mount $rootfs /mnt
  87   [ $? -eq "0" ] && let COUNTER=100;
  88   let COUNTER=COUNTER+1
  89 done
  90 [ $? -ne "0" ] && {
  91   export FAILSAFE="MountFail"
  92   exec /bin/busybox init
  93 }
  94
  95 #It mounted, lets look for a postinit file, again, give it time
  96 #I've seen this take 6 seconds to actually complete
  97 COUNTER=0
  98 while [ $COUNTER -lt 10 ]; do
  99   sleep 1
 100   [ -e /mnt/etc/banner ] && let COUNTER=10;
 101   let COUNTER=COUNTER+1
 102 done
 103 [ -e /mnt/etc/banner ] || {
 104   export FAILSAFE="No Openwrt FS"
 105   exec /bin/busybox init
 106 }
 107
 108 unset rootfs
 109
 110 mount -o move /proc /mnt/proc
 111 mount -o move /dev /mnt/dev
 112 mount -o move /dev/pts /mnt/dev/pts
 113 mount -o move /tmp /mnt/tmp
 114 mount -o move /sys /mnt/sys
 115 mount none /tmp -t tmpfs
 116 exec switch_root -c /dev/console /mnt /sbin/init