Trigger data wipe on spl-downgrade as well

    'vendor_boot']

class PayloadSigner(object):

  """A class that wraps the payload signing works.

  common.ZipDelete(target_file, POSTINSTALL_CONFIG)

  return target_file

def ParseInfoDict(target_file_path):

  with zipfile.ZipFile(target_file_path, 'r', allowZip64=True) as zfp:

    return common.LoadInfoDict(zfp)

def GetTargetFilesZipForPartialUpdates(input_file, ab_partitions):

  """Returns a target-files.zip for partial ota update package generation.

  return target_file

def GeneratePartitionTimestampFlags(partition_state):

  partition_timestamps = [

      part.partition_name + ":" + part.version

      for part in partition_state]

  return ["--partition_timestamps", ",".join(partition_timestamps)]

def GeneratePartitionTimestampFlagsDowngrade(

        pre_partition_state, post_partition_state):

  assert pre_partition_state is not None

        max(part.version, partition_timestamps[part.partition_name])

  return [

      "--partition_timestamps",

      ",".join([key + ":" + val for (key, val) in partition_timestamps.items()])

      ",".join([key + ":" + val for (key, val)

                in partition_timestamps.items()])

  ]

def IsSparseImage(filepath):

  with open(filepath, 'rb') as fp:

    # Magic for android sparse image format

    # https://source.android.com/devices/bootloader/images

    return fp.read(4) == b'\x3A\xFF\x26\xED'

def SupportsMainlineGkiUpdates(target_file):

  """Return True if the build supports MainlineGKIUpdates.

  pattern = re.compile(r"com\.android\.gki\..*\.apex")

  return pattern.search(output) is not None

def GenerateAbOtaPackage(target_file, output_file, source_file=None):

  """Generates an Android OTA package that has A/B update payload."""

  # Stage the output zip package for package signing.

  additional_args += ["--max_timestamp", max_timestamp]

  if SupportsMainlineGkiUpdates(source_file):

    logger.warning("Detected build with mainline GKI, include full boot image.")

    logger.warning(

        "Detected build with mainline GKI, include full boot image.")

    additional_args.extend(["--full_boot", "true"])

  payload.Generate(

      OPTIONS.disable_vabc = True

    elif o == "--spl_downgrade":

      OPTIONS.spl_downgrade = True

      OPTIONS.wipe_user_data = True

    else:

      return False

    return True

    if OPTIONS.incremental_source is None:

      raise ValueError("Cannot generate downgradable full OTAs")

  # TODO(xunchang) for retrofit and partial updates, maybe we should rebuild the

  # target-file and reload the info_dict. So the info will be consistent with

  # the modified target-file.

  logger.info("--- target info ---")

  common.DumpInfoDict(OPTIONS.info_dict)

  # Load the source build dict if applicable.

  if OPTIONS.incremental_source is not None:

    OPTIONS.target_info_dict = OPTIONS.info_dict

    source_spl = source_build_prop.GetProp(SECURITY_PATCH_LEVEL_PROP_NAME)

    target_spl = target_build_prop.GetProp(SECURITY_PATCH_LEVEL_PROP_NAME)

    is_spl_downgrade = target_spl < source_spl

    if is_spl_downgrade and not OPTIONS.spl_downgrade:

    if is_spl_downgrade and not OPTIONS.spl_downgrade and not OPTIONS.downgrade:

      raise common.ExternalError(

          "Target security patch level {} is older than source SPL {} applying "

          "such OTA will likely cause device fail to boot. Pass --spl_downgrade "