stateful_update

#!/bin/sh

# Copyright (c) 2010 The Chromium OS Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.

# This scripts performs update of stateful partition directories useful for
# dev_mode.

# Die on error.
set -e

LSB_RELEASE="/etc/lsb-release"
STATEFUL_DIR="/mnt/stateful_partition"
STATEFUL_IMAGE="$STATEFUL_DIR/stateful.image"
STATEFUL_MOUNT_POINT="/tmp/s"

if [ -n "$1" ]; then
  BASE_UPDATE_URL="$1"
else
  if [ -f "$STATEFUL_DIR$LSB_RELEASE" ]; then
    DEVSERVER_URL=$(grep CHROMEOS_DEVSERVER $STATEFUL_DIR$LSB_RELEASE | \
                  cut -f 2 -d '=')
  fi
  if [ -z "$DEVSERVER_URL" ]; then
    DEVSERVER_URL=$(grep CHROMEOS_DEVSERVER $LSB_RELEASE | cut -f 2 -d '=')
  fi
  # Sanity check.
  if [ -z "$DEVSERVER_URL" ]; then
    echo "No CHROMEOS_DEVSERVER URL found in lsb-release file"
    exit 1
  fi
  BASE_UPDATE_URL="$DEVSERVER_URL/static"
fi
STATEFUL_UPDATE_URL="$BASE_UPDATE_URL/stateful.image.gz"


# Prepare directories for update.
rm -rf "$STATEFUL_DIR/var_new" "$STATEFUL_DIR/dev_image_new"

# Prepare and mount new stateful partition.
rm -rf "$STATEFUL_MOUNT_POINT"
mkdir -p "$STATEFUL_MOUNT_POINT"

echo "Download stateful partition image from $STATEFUL_UPDATE_URL"
# Unzip mount and copy the relevant directories.
# Get the update.
eval "wget -qS -T 300 -O - \"$STATEFUL_UPDATE_URL\"" | \
    gzip -d > $STATEFUL_IMAGE
echo "Successfully downloaded update"
trap "rm -f \"$STATEFUL_IMAGE\"" EXIT
mount -n -o loop "$STATEFUL_IMAGE" "$STATEFUL_MOUNT_POINT"
if [ -d "$STATEFUL_MOUNT_POINT/var" ] && \
    [ -d "$STATEFUL_MOUNT_POINT/dev_image" ] ; then
  cp -rf "$STATEFUL_MOUNT_POINT/var" "$STATEFUL_DIR/var_new"
  cp -rf "$STATEFUL_MOUNT_POINT/dev_image" "$STATEFUL_DIR/dev_image_new"
  touch "$STATEFUL_DIR/.update_available"
else
  echo "No update available"
fi

umount -n -d "$STATEFUL_MOUNT_POINT"

rm -f "$STATEFUL_IMAGE"

trap - EXIT