#!/bin/sh
# $Id: $
# authors: Cristiano P.
#

# TODO: echo only if VERBOSE
# TODO: check the whole thing ...

# defaults:
VERBOSE=true
FORCE_FSCK=false
UMOUNT_FILES_DEV=false

FILES_DEV=/dev/mmcblk0p1
FILES_MNT=/mnt/mmc
ROOT_DEV=$FILES_MNT/opie-image-v0.8.4-palmtx.rootfs.ext2
SWAP_DEV=none

MODULES_DIR="/lib/modules"
POST_MODULES_SCRIPT=""

echo mounting sysfs
mount -n -t sysfs sys /sys >/dev/null 2>&1 || mount -t sysfs sys /sys

echo mounting proc filesystem
mount -n -t proc none /proc >/dev/null  2>&1 || mount -t proc none /proc

# try to get model name from /proc/cpuinfo
MODEL_NAME=`awk -F: '/Hardware/ { print $2 }' </proc/cpuinfo | sed 's/^ *//;s/ *$//'`

[ $VERBOSE = "true" ] && echo Model name: $MODEL_NAME

# device specific configuration
case $MODEL_NAME in
  "Palm TX")
    FILES_MNT=/media/mmc1  
  ;;
  
  "Palm LifeDrive")
    HDD_DEV=/dev/hda
    HDD_OFFSET=91814912
    LOOP_DEV=/dev/loop0
  ;;
  
  *)
  ;;  
esac

echo initram init started

if [ -f /etc/modules.initrd ]; then
  echo loading initial modules
  cat /etc/modules.initrd | while read module; do
    echo loading module: $module
    /sbin/insmod $MODULES_DIR/$module > /dev/null
  done
fi


# device specific actions ...
case $MODEL_NAME in
  "Palm LifeDrive")
     echo Mounting LifeDrive data partition...
     losetup -o $HDD_OFFSET $LOOP_DEV $HDD_DEV
     FILES_DEV=$LOOP_DEV
     FILES_MNT=/mnt/hda	     
  ;;

  *)
  ;;
esac


if [ -b $FILES_DEV ]; then
  FILES_DEV_MOUNTED=false
  echo -n "attempting to mount $FILES_DEV: "
  /bin/mount -t vfat -o rw $FILES_DEV $FILES_MNT > /dev/null 2>&1
  [ $? ] && FILES_DEV_MOUNTED=true

  if [ $FILES_DEV_MOUNTED = "true" ]; then	
    echo "mounted on $FILES_MNT."
    /bin/sleep 1
    echo -n "sourcing linux.boot.cfg: "
    # todo: check parameters/files?
    if [ -f $FILES_MNT/linux.boot.cfg ]; then
      echo found.
      .  $FILES_MNT/linux.boot.cfg

      if [ -f $FILES_MNT/modules.initrd ]; then
        echo loading additional modules now:
        cat $FILES_MNT/modules.initrd | while read module; do
          loading module: $module
          /sbin/insmod $MODULES_DIR/$module > /dev/null
        done
      fi
    else
      echo not found.
    fi
  else
    echo "could not mount."
    FILES_DEV_MOUNTED=false
  fi
else
  echo device $FILES_DEV not found.
  FILES_DEV_MOUNTED=false
fi

# this script could be used to update the rootfs before booting familiar (new modules, scripts, config, ...)
echo -n "post_module script: "
if [ -n "$POST_MODULES_SCRIPT" ]; then
  if [ -f "$POST_MODULES_SCRIPT" ]; then
    echo found $POST_MODULES_SCRIPT .
    $POST_MODULES_SCRIPT
  fi
else
  echo not found.
fi

# probably swap should/can be enabled by familiar (add to /etc/fstab?)
# is it the right place to mount swap?
if [ -n "$SWAP_DEV" -a $SWAP_DEV != "none" ]; then
  echo -n "mount swap at $SWAP_DEV: "

  if [ -f $SWAP_DEV -o -b $SWAP_DEV ]; then
    /sbin/swapon $SWAP_DEV > /dev/null 2>&1
    echo done.
  else
    echo not found.
  fi
else
  echo "no swap specified."
fi

# force fsck if specified
if [ $FORCE_FSCK = "true" ]; then
  echo "checking rootfs [$ROOT_DEV]"
  if [ $VERBOSE = "true" ]; then
    /sbin/e2fsck -f -y $ROOT_DEV
  else
    /sbin/e2fsck -f -y $ROOT_DEV > /dev/null 2>&1
  fi
fi

echo -n "mounting rootfs: "

# todo: calculate root dev id? (256*major + minor)
if [ -f $ROOT_DEV ]; then
  #echo 0x701 > /proc/sys/kernel/real-root-dev
  mount -n $ROOT_DEV /newroot -o rw loop 2>/dev/null
  [ $? ] && ROOT_MOUNTED=true
  # this shouldn't be possible if image is on FILES_DEV
  UMOUNT_FILES_DEV=false
elif [ -b $ROOT_DEV ]; then
  mount -n $ROOT_DEV /newroot -o rw 2>/dev/null
  [ $? ] && ROOT_MOUNTED=true
else
  echo "not a file or a block device."
  ROOT_MOUNTED=false
fi

# TODO: should initial /dev (/oldroot/dev) be unmounted after init by GPE?
if [ $ROOT_MOUNTED = "true" ]; then
  echo mounted

  # umount mmc if forced by UMOUNT_FILES_DEV
  if [ $UMOUNT_FILES_DEV = "true" -a $FILES_DEV_MOUNTED = "true" ]; then
    umount -l $FILES_DEV
    [ $? ] && FILES_DEV_MOUNTED=false
    [ $FILES_DEV_MOUNTED = "false" ] && echo "$FILES_DEV umounted"
  fi
  
  # move mmc's mount point on new rootfs
  if [ $FILES_DEV_MOUNTED = "true" ]; then
    echo moving $FILES_MNT to /newroot$FILES_MNT
    mount --move $FILES_MNT /newroot$FILES_MNT
  fi

  # force umount sys and proc
  umount -l /sys
  umount -l /proc

  # method 2: use switch_root (needs initramfs)
  exec /sbin/switch_root -c /dev/console /newroot /sbin/init 5

  echo "*  * * switch_root failed!  * * *"
else
  echo "failed!"
  echo could not mount root fs: init failed!
  echo please, reset, check your configuration and retry.
  sleep 100000
fi

# TODO: run ezhikov's keyshell here?
exec /bin/sh