package/base-files/files/sbin/mount_root

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