package/base-files/files/etc/preinit

   1 #!/bin/sh
   2 # Copyright (C) 2006 OpenWrt.org
   3 export PATH=/bin:/sbin:/usr/bin:/usr/sbin
   4 . /etc/diag.sh
   5
   6 failsafe() {
   7         lock /tmp/.failsafe
   8         ash --login
   9 }
  10
  11 mount none /proc -t proc
  12 mount none /sys  -t sysfs
  13
  14 size=$(awk '/MemTotal:/ {l=5242880;mt=($2*1024);print((s=mt/2)<l)?mt-l:s}' /proc/meminfo)
  15 mount none /tmp -t tmpfs -o size=$size,nosuid,nodev,mode=1777
  16
  17 if grep devfs /proc/filesystems > /dev/null; then
  18         mount none /dev -t devfs
  19         M0=/dev/pty/m0
  20         M1=/dev/pty/m1
  21         HOTPLUG=/sbin/hotplug-call
  22 else
  23         mount -t tmpfs tmpfs /dev -o size=512K
  24         mknod /dev/console c 5 1
  25         mkdir /dev/shm
  26         /sbin/hotplug2 --no-persistent --coldplug --set-rules-file /etc/hotplug2-init.rules
  27         M0=/dev/ptmx
  28         M1=/dev/ptmx
  29         HOTPLUG=
  30 fi
  31
  32 mkdir -p /dev/pts /dev/shm
  33 mount none /dev/pts -t devpts
  34
  35 # the shell really doesn't like having stdin/out closed
  36 # that's why we use /dev/pty/m0 and m1 as replacement
  37 # for /dev/console if there's no serial console available
  38 dd if=/dev/console of=/dev/null bs=1 count=0 >/dev/null 2>/dev/null && {
  39         M0=/dev/console
  40         M1=/dev/console
  41 }
  42
  43 exec <$M0 >$M1 2>&0
  44
  45 {
  46         echo "- preinit -"
  47         [ -e /etc/preinit.arch ] && . /etc/preinit.arch
  48         set_state preinit
  49
  50         echo "$HOTPLUG" > /proc/sys/kernel/hotplug
  51
  52         eval ${FAILSAFE:+failsafe}
  53         lock -w /tmp/.failsafe
  54
  55         mount_root
  56
  57         echo "- init -"
  58 } | tee /tmp/preinit.log
  59
  60 exec /sbin/init