#!/bin/bash

PROG_NAME="`basename $0`"
TMP_MOUNT_DIR="/tmp/${PROG_NAME}_$$"
LOGGER_CMD="logger -t $PROG_NAME"
PROBE_OUT_FILE="${PROG_NAME}_$$_env.txt"

if [[ -r "/etc/`basename $0`.cfg" ]]; then
  . /etc/`basename $0`.cfg
else
  ${LOGGER_CMD} "ERROR: no config file found"
  exit 1
fi

if [[ -z "$SONY_FS_UUIDS" ]]; then
  ${LOGGER_CMD} "WARN: no SONY_FS_UUIDS configured, running in probe mode. Plug your SD card and check ID_FS_UUID from /tmp/$PROBE_OUT_FILE"
  env > /tmp/$PROBE_OUT_FILE
  exit 0
fi

ERR=0

function run_update {
  if [[ "$SONY_FS_UUIDS" =~ "$ID_FS_UUID" ]]; then
    ${LOGGER_CMD} "Device with known FS UUID added. Mounting ..." 
    mkdir $TMP_MOUNT_DIR
    mount $DEVNAME $TMP_MOUNT_DIR
    if [[ $? -ne 0 ]]; then
      ${LOGGER_CMD} "Mount failed. Exiting."
      return 5
    fi

    if [[ -d "${TMP_MOUNT_DIR}/PRIVATE" ]]; then
      ${LOGGER_CMD} $PROG_NAME "Sony-formatted partition found. Good. Updating GPS-A data now"
      test -d ${TMP_MOUNT_DIR}/PRIVATE/SONY/GPS || mkdir -p ${TMP_MOUNT_DIR}/PRIVATE/SONY/GPS
      cd ${TMP_MOUNT_DIR}/PRIVATE/SONY/GPS
      wget http://control.d-imaging.sony.co.jp/GPS/assistme.dat -O assistme.dat.tmp
      if [[ $? -ne 0 ]]; then
        ${LOGGER_CMD} "Failed to download assistme.dat. Exiting."
	return 10
      else
        mv assistme.dat assistme.dat.old
        mv assistme.dat.tmp assistme.dat
      fi
      ${LOGGER_CMD} $PROG_NAME "Update successful."
      cd ${TMP_MOUNT_DIR}/..
    else
      ${LOGGER_CMD} $PROG_NAME "No Sony formatted card. Ignoring."
    fi
  else
      exit 0
  fi
}

run_update
ERR=$?
if [[ $ERR -ne 5 ]]; then
  umount $TMP_MOUNT_DIR
  if [[ $? -ne 0 ]]; then
    ${LOGGER_CMD} "WARNING: failed to unmount $TMP_MOUNT_DIR"
    ERR=15
  else
    rmdir $TMP_MOUNT_DIR
  fi
fi

exit $ERR