package/base-files/files/sbin/mount_root

   1 #!/bin/sh
   2 # Copyright (C) 2006 OpenWrt.org
   3 . /etc/functions.sh
   4
   5 mount none /proc -t proc
   6
   7 size=$(awk '/MemTotal:/ {l=5242880;mt=($2*1024);print((s=mt/2)<l)?mt-l:s}' /proc/meminfo)
   8 mount none /tmp -t tmpfs -o size=$size,nosuid,nodev,mode=1777
   9
  10 if grep devfs /proc/filesystems > /dev/null; then
  11         mount none /dev -t devfs
  12         M0=/dev/pty/m0
  13         M1=/dev/pty/m1
  14         HOTPLUG=/sbin/hotplug-call
  15 else
  16         mount -t sysfs none /sys
  17         mount -t tmpfs tmpfs /dev -o size=512K
  18         mknod /dev/console c 5 1
  19         mkdir /dev/shm
  20         /sbin/hotplug2 --no-persistent --coldplug --set-rules-file /etc/hotplug2-init.rules
  21         M0=/dev/ptmx
  22         M1=/dev/ptmx
  23         HOTPLUG=
  24 fi
  25
  26 mkdir -p /dev/pts /dev/shm
  27 mount none /dev/pts -t devpts
  28
  29 # the shell really doesn't like having stdin/out closed
  30 # that's why we use /dev/pty/m0 and m1 as replacement
  31 # for /dev/console if there's no serial console available
  32 dd if=/dev/console of=/dev/null bs=1 count=0 >/dev/null 2>/dev/null || \
  33         exec <$M0 >$M1 2>&0
  34
  35 echo "$HOTPLUG" > /proc/sys/kernel/hotplug
  36
  37 jffs2_ready () {
  38         mtdpart="$(find_mtd_part rootfs_data)"
  39         magic=$(hexdump $mtdpart -n 4 -e '4/1 "%02x"')
  40         [ "$magic" != "deadc0de" ]
  41 }
  42
  43 [ failsafe != "$1" ] && {
  44         grep rootfs /proc/mtd >/dev/null 2>/dev/null && {
  45                 mtd unlock rootfs
  46                 grep rootfs_data /proc/mtd >/dev/null 2>/dev/null && {
  47                         . /bin/firstboot
  48                         jffs2_ready && {
  49                                 echo "switching to jffs2"
  50                                 mount "$(find_mtd_part rootfs_data)" /jffs -t jffs2 && \
  51                                 fopivot /jffs /rom
  52                         } || {
  53                                 echo "jffs2 not ready yet; using ramdisk"
  54                                 ramoverlay
  55                         }
  56                 }
  57         } || mount -o remount,rw /dev/root /
  58 }