package/base-files/files/sbin/mount_root

   1 #!/bin/sh
   2 # Copyright (C) 2006 OpenWrt.org
   3 . /etc/functions.sh
   4
   5 mkdir -p /dev/pts /dev/shm
   6 mount none /dev/pts -t devpts
   7 mount none /proc -t proc
   8
   9 size=$(awk '/MemTotal:/ {l=5242880;mt=($2*1024);print((s=mt/2)<l)?mt-l:s}' /proc/meminfo)
  10 mount none /tmp -t tmpfs -o size=$size,nosuid,nodev,mode=1777
  11
  12 if grep devfs /proc/filesystems > /dev/null; then
  13         mount none /dev -t devfs
  14         M0=/dev/pty/m0
  15         M1=/dev/pty/m1
  16         HOTPLUG=/sbin/hotplug-call
  17 else
  18         mount -t sysfs none /sys
  19         mount -t tmpfs tmpfs /dev -o size=512K
  20         mknod /dev/console c 5 1
  21         mkdir /dev/shm
  22         /sbin/hotplug2 --no-persistent --coldplug --set-rules-file /etc/hotplug2-init.rules
  23         M0=/dev/ptmx
  24         M1=/dev/ptmx
  25         HOTPLUG=
  26 fi
  27
  28 # the shell really doesn't like having stdin/out closed
  29 # that's why we use /dev/pty/m0 and m1 as replacement
  30 # for /dev/console if there's no serial console available
  31 dd if=/dev/console of=/dev/null bs=1 count=0 >/dev/null 2>/dev/null || \
  32         exec <$M0 >$M1 2>&0
  33
  34 echo "$HOTPLUG" > /proc/sys/kernel/hotplug
  35
  36 jffs2_ready () {
  37         mtdpart="$(find_mtd_part rootfs_data)"
  38         magic=$(hexdump $mtdpart -n 4 -e '4/1 "%02x"')
  39         [ "$magic" != "deadc0de" ]
  40 }
  41
  42 [ failsafe != "$1" ] && {
  43         grep rootfs /proc/mtd >/dev/null 2>/dev/null && {
  44                 mtd unlock rootfs
  45                 grep rootfs_data /proc/mtd >/dev/null 2>/dev/null && {
  46                         . /bin/firstboot
  47                         jffs2_ready && {
  48                                 echo "switching to jffs2"
  49                                 mount "$(find_mtd_part rootfs_data)" /jffs -t jffs2
  50                                 fopivot /jffs /rom
  51                         } || {
  52                                 echo "jffs2 not ready yet; using ramdisk"
  53                                 ramoverlay
  54                         }
  55                 }
  56         } || mount -o remount,rw /dev/root /
  57 }