#!/usr/bin/env python
#
# Copyright (C) 2014 The Android Open Source Project
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#      http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

"""
Given a target-files zipfile that does not contain images (ie, does
not have an IMAGES/ top-level subdirectory), produce the images and
add them to the zipfile.

Usage:  add_img_to_target_files [flag] target_files

  -a  (--add_missing)
      Build and add missing images to "IMAGES/". If this option is
      not specified, this script will simply exit when "IMAGES/"
      directory exists in the target file.

  -r  (--rebuild_recovery)
      Rebuild the recovery patch and write it to the system image. Only
      meaningful when system image needs to be rebuilt and there're separate
      boot / recovery images.

  --replace_verity_private_key
      Replace the private key used for verity signing. (same as the option
      in sign_target_files_apks)

  --replace_verity_public_key
       Replace the certificate (public key) used for verity verification. (same
       as the option in sign_target_files_apks)

  --is_signing
      Skip building & adding the images for "userdata" and "cache" if we
      are signing the target files.
"""

from __future__ import print_function

import datetime
import logging
import os
import shlex
import shutil
import sys
import uuid
import zipfile

import build_image
import build_super_image
import common
import rangelib
import sparse_img

if sys.hexversion < 0x02070000:
  print("Python 2.7 or newer is required.", file=sys.stderr)
  sys.exit(1)

logger = logging.getLogger(__name__)

OPTIONS = common.OPTIONS
OPTIONS.add_missing = False
OPTIONS.rebuild_recovery = False
OPTIONS.replace_updated_files_list = []
OPTIONS.replace_verity_public_key = False
OPTIONS.replace_verity_private_key = False
OPTIONS.is_signing = False

# Use a fixed timestamp (01/01/2009 00:00:00 UTC) for files when packaging
# images. (b/24377993, b/80600931)
FIXED_FILE_TIMESTAMP = int((
    datetime.datetime(2009, 1, 1, 0, 0, 0, 0, None) -
    datetime.datetime.utcfromtimestamp(0)).total_seconds())


class OutputFile(object):
  """A helper class to write a generated file to the given dir or zip.

  When generating images, we want the outputs to go into the given zip file, or
  the given dir.

  Attributes:
    name: The name of the output file, regardless of the final destination.
  """

  def __init__(self, output_zip, input_dir, prefix, name):
    # We write the intermediate output file under the given input_dir, even if
    # the final destination is a zip archive.
    self.name = os.path.join(input_dir, prefix, name)
    self._output_zip = output_zip
    if self._output_zip:
      self._zip_name = os.path.join(prefix, name)

  def Write(self):
    if self._output_zip:
      common.ZipWrite(self._output_zip, self.name, self._zip_name)


def GetCareMap(which, imgname):
  """Returns the care_map string for the given partition.

  Args:
    which: The partition name, must be listed in PARTITIONS_WITH_CARE_MAP.
    imgname: The filename of the image.

  Returns:
    (which, care_map_ranges): care_map_ranges is the raw string of the care_map
    RangeSet.
  """
  assert which in common.PARTITIONS_WITH_CARE_MAP

  simg = sparse_img.SparseImage(imgname)
  care_map_ranges = simg.care_map
  size_key = which + "_image_size"
  image_size = OPTIONS.info_dict.get(size_key)
  if image_size:
    # excludes the verity metadata blocks of the given image. When AVB is enabled,
    # this size is the max image size returned by the AVB tool
    image_blocks = int(image_size) / 4096 - 1
    assert image_blocks > 0, "blocks for {} must be positive".format(which)
    care_map_ranges = care_map_ranges.intersect(
        rangelib.RangeSet("0-{}".format(image_blocks)))

  return [which, care_map_ranges.to_string_raw()]


def AddSystem(output_zip, recovery_img=None, boot_img=None):
  """Turn the contents of SYSTEM into a system image and store it in
  output_zip. Returns the name of the system image file."""

  img = OutputFile(output_zip, OPTIONS.input_tmp, "IMAGES", "system.img")
  if os.path.exists(img.name):
    logger.info("system.img already exists; no need to rebuild...")
    return img.name

  def output_sink(fn, data):
    ofile = open(os.path.join(OPTIONS.input_tmp, "SYSTEM", fn), "w")
    ofile.write(data)
    ofile.close()

    if output_zip:
      arc_name = "SYSTEM/" + fn
      if arc_name in output_zip.namelist():
        OPTIONS.replace_updated_files_list.append(arc_name)
      else:
        common.ZipWrite(output_zip, ofile.name, arc_name)

  if (OPTIONS.rebuild_recovery and recovery_img is not None and
      boot_img is not None):
    logger.info("Building new recovery patch")
    common.MakeRecoveryPatch(OPTIONS.input_tmp, output_sink, recovery_img,
                             boot_img, info_dict=OPTIONS.info_dict)

  block_list = OutputFile(output_zip, OPTIONS.input_tmp, "IMAGES", "system.map")
  CreateImage(OPTIONS.input_tmp, OPTIONS.info_dict, "system", img,
              block_list=block_list)

  return img.name


def AddSystemOther(output_zip):
  """Turn the contents of SYSTEM_OTHER into a system_other image
  and store it in output_zip."""

  img = OutputFile(output_zip, OPTIONS.input_tmp, "IMAGES", "system_other.img")
  if os.path.exists(img.name):
    logger.info("system_other.img already exists; no need to rebuild...")
    return

  CreateImage(OPTIONS.input_tmp, OPTIONS.info_dict, "system_other", img)


def AddVendor(output_zip):
  """Turn the contents of VENDOR into a vendor image and store in it
  output_zip."""

  img = OutputFile(output_zip, OPTIONS.input_tmp, "IMAGES", "vendor.img")
  if os.path.exists(img.name):
    logger.info("vendor.img already exists; no need to rebuild...")
    return img.name

  block_list = OutputFile(output_zip, OPTIONS.input_tmp, "IMAGES", "vendor.map")
  CreateImage(OPTIONS.input_tmp, OPTIONS.info_dict, "vendor", img,
              block_list=block_list)
  return img.name


def AddProduct(output_zip):
  """Turn the contents of PRODUCT into a product image and store it in
  output_zip."""

  img = OutputFile(output_zip, OPTIONS.input_tmp, "IMAGES", "product.img")
  if os.path.exists(img.name):
    logger.info("product.img already exists; no need to rebuild...")
    return img.name

  block_list = OutputFile(
      output_zip, OPTIONS.input_tmp, "IMAGES", "product.map")
  CreateImage(
      OPTIONS.input_tmp, OPTIONS.info_dict, "product", img,
      block_list=block_list)
  return img.name


def AddProductServices(output_zip):
  """Turn the contents of PRODUCT_SERVICES into a product_services image and
  store it in output_zip."""

  img = OutputFile(output_zip, OPTIONS.input_tmp, "IMAGES",
                   "product_services.img")
  if os.path.exists(img.name):
    logger.info("product_services.img already exists; no need to rebuild...")
    return img.name

  block_list = OutputFile(
      output_zip, OPTIONS.input_tmp, "IMAGES", "product_services.map")
  CreateImage(
      OPTIONS.input_tmp, OPTIONS.info_dict, "product_services", img,
      block_list=block_list)
  return img.name


def AddOdm(output_zip):
  """Turn the contents of ODM into an odm image and store it in output_zip."""

  img = OutputFile(output_zip, OPTIONS.input_tmp, "IMAGES", "odm.img")
  if os.path.exists(img.name):
    logger.info("odm.img already exists; no need to rebuild...")
    return img.name

  block_list = OutputFile(
      output_zip, OPTIONS.input_tmp, "IMAGES", "odm.map")
  CreateImage(
      OPTIONS.input_tmp, OPTIONS.info_dict, "odm", img,
      block_list=block_list)
  return img.name


def AddDtbo(output_zip):
  """Adds the DTBO image.

  Uses the image under IMAGES/ if it already exists. Otherwise looks for the
  image under PREBUILT_IMAGES/, signs it as needed, and returns the image name.
  """
  img = OutputFile(output_zip, OPTIONS.input_tmp, "IMAGES", "dtbo.img")
  if os.path.exists(img.name):
    logger.info("dtbo.img already exists; no need to rebuild...")
    return img.name

  dtbo_prebuilt_path = os.path.join(
      OPTIONS.input_tmp, "PREBUILT_IMAGES", "dtbo.img")
  assert os.path.exists(dtbo_prebuilt_path)
  shutil.copy(dtbo_prebuilt_path, img.name)

  # AVB-sign the image as needed.
  if OPTIONS.info_dict.get("avb_enable") == "true":
    avbtool = OPTIONS.info_dict["avb_avbtool"]
    part_size = OPTIONS.info_dict["dtbo_size"]
    # The AVB hash footer will be replaced if already present.
    cmd = [avbtool, "add_hash_footer", "--image", img.name,
           "--partition_size", str(part_size), "--partition_name", "dtbo"]
    common.AppendAVBSigningArgs(cmd, "dtbo")
    args = OPTIONS.info_dict.get("avb_dtbo_add_hash_footer_args")
    if args and args.strip():
      cmd.extend(shlex.split(args))
    common.RunAndCheckOutput(cmd)

  img.Write()
  return img.name


def CreateImage(input_dir, info_dict, what, output_file, block_list=None):
  logger.info("creating " + what + ".img...")

  image_props = build_image.ImagePropFromGlobalDict(info_dict, what)
  fstab = info_dict["fstab"]
  mount_point = "/" + what
  if fstab and mount_point in fstab:
    image_props["fs_type"] = fstab[mount_point].fs_type

  image_props["timestamp"] = FIXED_FILE_TIMESTAMP

  if what == "system":
    fs_config_prefix = ""
  else:
    fs_config_prefix = what + "_"

  fs_config = os.path.join(
      input_dir, "META/" + fs_config_prefix + "filesystem_config.txt")
  if not os.path.exists(fs_config):
    fs_config = None

  # Override values loaded from info_dict.
  if fs_config:
    image_props["fs_config"] = fs_config
  if block_list:
    image_props["block_list"] = block_list.name

  # Use repeatable ext4 FS UUID and hash_seed UUID (based on partition name and
  # build fingerprint).
  uuid_seed = what + "-"
  if "build.prop" in info_dict:
    build_prop = info_dict["build.prop"]
    if "ro.build.fingerprint" in build_prop:
      uuid_seed += build_prop["ro.build.fingerprint"]
    elif "ro.build.thumbprint" in build_prop:
      uuid_seed += build_prop["ro.build.thumbprint"]
  image_props["uuid"] = str(uuid.uuid5(uuid.NAMESPACE_URL, uuid_seed))
  hash_seed = "hash_seed-" + uuid_seed
  image_props["hash_seed"] = str(uuid.uuid5(uuid.NAMESPACE_URL, hash_seed))

  build_image.BuildImage(
      os.path.join(input_dir, what.upper()), image_props, output_file.name)

  output_file.Write()
  if block_list:
    block_list.Write()

  # Set the '_image_size' for given image size.
  is_verity_partition = "verity_block_device" in image_props
  verity_supported = (image_props.get("verity") == "true" or
                      image_props.get("avb_enable") == "true")
  is_avb_enable = image_props.get("avb_hashtree_enable") == "true"
  if verity_supported and (is_verity_partition or is_avb_enable):
    image_size = image_props.get("image_size")
    if image_size:
      image_size_key = what + "_image_size"
      info_dict[image_size_key] = int(image_size)

  use_dynamic_size = (
      info_dict.get("use_dynamic_partition_size") == "true" and
      what in shlex.split(info_dict.get("dynamic_partition_list", "").strip()))
  if use_dynamic_size:
    info_dict.update(build_image.GlobalDictFromImageProp(image_props, what))


def AddUserdata(output_zip):
  """Create a userdata image and store it in output_zip.

  In most case we just create and store an empty userdata.img;
  But the invoker can also request to create userdata.img with real
  data from the target files, by setting "userdata_img_with_data=true"
  in OPTIONS.info_dict.
  """

  img = OutputFile(output_zip, OPTIONS.input_tmp, "IMAGES", "userdata.img")
  if os.path.exists(img.name):
    logger.info("userdata.img already exists; no need to rebuild...")
    return

  # Skip userdata.img if no size.
  image_props = build_image.ImagePropFromGlobalDict(OPTIONS.info_dict, "data")
  if not image_props.get("partition_size"):
    return

  logger.info("creating userdata.img...")

  image_props["timestamp"] = FIXED_FILE_TIMESTAMP

  if OPTIONS.info_dict.get("userdata_img_with_data") == "true":
    user_dir = os.path.join(OPTIONS.input_tmp, "DATA")
  else:
    user_dir = common.MakeTempDir()

  fstab = OPTIONS.info_dict["fstab"]
  if fstab:
    image_props["fs_type"] = fstab["/data"].fs_type
  build_image.BuildImage(user_dir, image_props, img.name)

  common.CheckSize(img.name, "userdata.img", OPTIONS.info_dict)
  img.Write()


def AppendVBMetaArgsForPartition(cmd, partition, image):
  """Appends the VBMeta arguments for partition.

  It sets up the VBMeta argument by including the partition descriptor from the
  given 'image', or by configuring the partition as a chained partition.

  Args:
    cmd: A list of command args that will be used to generate the vbmeta image.
        The argument for the partition will be appended to the list.
    partition: The name of the partition (e.g. "system").
    image: The path to the partition image.
  """
  # Check if chain partition is used.
  key_path = OPTIONS.info_dict.get("avb_" + partition + "_key_path")
  if key_path:
    chained_partition_arg = common.GetAvbChainedPartitionArg(
        partition, OPTIONS.info_dict)
    cmd.extend(["--chain_partition", chained_partition_arg])
  else:
    cmd.extend(["--include_descriptors_from_image", image])


def AddVBMeta(output_zip, partitions, name, needed_partitions):
  """Creates a VBMeta image and stores it in output_zip.

  It generates the requested VBMeta image. The requested image could be for
  top-level or chained VBMeta image, which is determined based on the name.

  Args:
    output_zip: The output zip file, which needs to be already open.
    partitions: A dict that's keyed by partition names with image paths as
        values. Only valid partition names are accepted, as listed in
        common.AVB_PARTITIONS.
    name: Name of the VBMeta partition, e.g. 'vbmeta', 'vbmeta_system'.
    needed_partitions: Partitions whose descriptors should be included into the
        generated VBMeta image.

  Returns:
    Path to the created image.

  Raises:
    AssertionError: On invalid input args.
  """
  assert needed_partitions, "Needed partitions must be specified"

  img = OutputFile(
      output_zip, OPTIONS.input_tmp, "IMAGES", "{}.img".format(name))
  if os.path.exists(img.name):
    logger.info("%s.img already exists; not rebuilding...", name)
    return img.name

  avbtool = OPTIONS.info_dict["avb_avbtool"]
  cmd = [avbtool, "make_vbmeta_image", "--output", img.name]
  common.AppendAVBSigningArgs(cmd, name)

  for partition, path in partitions.items():
    if partition not in needed_partitions:
      continue
    assert (partition in common.AVB_PARTITIONS or
            partition.startswith('vbmeta_')), \
        'Unknown partition: {}'.format(partition)
    assert os.path.exists(path), \
        'Failed to find {} for {}'.format(path, partition)
    AppendVBMetaArgsForPartition(cmd, partition, path)

  args = OPTIONS.info_dict.get("avb_{}_args".format(name))
  if args and args.strip():
    split_args = shlex.split(args)
    for index, arg in enumerate(split_args[:-1]):
      # Sanity check that the image file exists. Some images might be defined
      # as a path relative to source tree, which may not be available at the
      # same location when running this script (we have the input target_files
      # zip only). For such cases, we additionally scan other locations (e.g.
      # IMAGES/, RADIO/, etc) before bailing out.
      if arg == '--include_descriptors_from_image':
        image_path = split_args[index + 1]
        if os.path.exists(image_path):
          continue
        found = False
        for dir_name in ['IMAGES', 'RADIO', 'PREBUILT_IMAGES']:
          alt_path = os.path.join(
              OPTIONS.input_tmp, dir_name, os.path.basename(image_path))
          if os.path.exists(alt_path):
            split_args[index + 1] = alt_path
            found = True
            break
        assert found, 'Failed to find {}'.format(image_path)
    cmd.extend(split_args)

  common.RunAndCheckOutput(cmd)
  img.Write()
  return img.name


def AddPartitionTable(output_zip):
  """Create a partition table image and store it in output_zip."""

  img = OutputFile(
      output_zip, OPTIONS.input_tmp, "IMAGES", "partition-table.img")
  bpt = OutputFile(
      output_zip, OPTIONS.input_tmp, "META", "partition-table.bpt")

  # use BPTTOOL from environ, or "bpttool" if empty or not set.
  bpttool = os.getenv("BPTTOOL") or "bpttool"
  cmd = [bpttool, "make_table", "--output_json", bpt.name,
         "--output_gpt", img.name]
  input_files_str = OPTIONS.info_dict["board_bpt_input_files"]
  input_files = input_files_str.split(" ")
  for i in input_files:
    cmd.extend(["--input", i])
  disk_size = OPTIONS.info_dict.get("board_bpt_disk_size")
  if disk_size:
    cmd.extend(["--disk_size", disk_size])
  args = OPTIONS.info_dict.get("board_bpt_make_table_args")
  if args:
    cmd.extend(shlex.split(args))
  common.RunAndCheckOutput(cmd)

  img.Write()
  bpt.Write()


def AddCache(output_zip):
  """Create an empty cache image and store it in output_zip."""

  img = OutputFile(output_zip, OPTIONS.input_tmp, "IMAGES", "cache.img")
  if os.path.exists(img.name):
    logger.info("cache.img already exists; no need to rebuild...")
    return

  image_props = build_image.ImagePropFromGlobalDict(OPTIONS.info_dict, "cache")
  # The build system has to explicitly request for cache.img.
  if "fs_type" not in image_props:
    return

  logger.info("creating cache.img...")

  image_props["timestamp"] = FIXED_FILE_TIMESTAMP

  user_dir = common.MakeTempDir()

  fstab = OPTIONS.info_dict["fstab"]
  if fstab:
    image_props["fs_type"] = fstab["/cache"].fs_type
  build_image.BuildImage(user_dir, image_props, img.name)

  common.CheckSize(img.name, "cache.img", OPTIONS.info_dict)
  img.Write()


def CheckAbOtaImages(output_zip, ab_partitions):
  """Checks that all the listed A/B partitions have their images available.

  The images need to be available under IMAGES/ or RADIO/, with the former takes
  a priority.

  Args:
    output_zip: The output zip file (needs to be already open), or None to
        find images in OPTIONS.input_tmp/.
    ab_partitions: The list of A/B partitions.

  Raises:
    AssertionError: If it can't find an image.
  """
  for partition in ab_partitions:
    img_name = partition.strip() + ".img"

    # Assert that the image is present under IMAGES/ now.
    if output_zip:
      # Zip spec says: All slashes MUST be forward slashes.
      images_path = "IMAGES/" + img_name
      radio_path = "RADIO/" + img_name
      available = (images_path in output_zip.namelist() or
                   radio_path in output_zip.namelist())
    else:
      images_path = os.path.join(OPTIONS.input_tmp, "IMAGES", img_name)
      radio_path = os.path.join(OPTIONS.input_tmp, "RADIO", img_name)
      available = os.path.exists(images_path) or os.path.exists(radio_path)

    assert available, "Failed to find " + img_name


def AddCareMapForAbOta(output_zip, ab_partitions, image_paths):
  """Generates and adds care_map.pb for a/b partition that has care_map.

  Args:
    output_zip: The output zip file (needs to be already open), or None to
        write care_map.pb to OPTIONS.input_tmp/.
    ab_partitions: The list of A/B partitions.
    image_paths: A map from the partition name to the image path.
  """
  care_map_list = []
  for partition in ab_partitions:
    partition = partition.strip()
    if partition not in common.PARTITIONS_WITH_CARE_MAP:
      continue

    verity_block_device = "{}_verity_block_device".format(partition)
    avb_hashtree_enable = "avb_{}_hashtree_enable".format(partition)
    if (verity_block_device in OPTIONS.info_dict or
        OPTIONS.info_dict.get(avb_hashtree_enable) == "true"):
      image_path = image_paths[partition]
      assert os.path.exists(image_path)
      care_map_list += GetCareMap(partition, image_path)

      # adds fingerprint field to the care_map
      build_props = OPTIONS.info_dict.get(partition + ".build.prop", {})
      prop_name_list = ["ro.{}.build.fingerprint".format(partition),
                        "ro.{}.build.thumbprint".format(partition)]

      present_props = [x for x in prop_name_list if x in build_props]
      if not present_props:
        logger.warning("fingerprint is not present for partition %s", partition)
        property_id, fingerprint = "unknown", "unknown"
      else:
        property_id = present_props[0]
        fingerprint = build_props[property_id]
      care_map_list += [property_id, fingerprint]

  if not care_map_list:
    return

  # Converts the list into proto buf message by calling care_map_generator; and
  # writes the result to a temp file.
  temp_care_map_text = common.MakeTempFile(prefix="caremap_text-",
                                           suffix=".txt")
  with open(temp_care_map_text, 'w') as text_file:
    text_file.write('\n'.join(care_map_list))

  temp_care_map = common.MakeTempFile(prefix="caremap-", suffix=".pb")
  care_map_gen_cmd = ["care_map_generator", temp_care_map_text, temp_care_map]
  common.RunAndCheckOutput(care_map_gen_cmd)

  care_map_path = "META/care_map.pb"
  if output_zip and care_map_path not in output_zip.namelist():
    common.ZipWrite(output_zip, temp_care_map, arcname=care_map_path)
  else:
    shutil.copy(temp_care_map, os.path.join(OPTIONS.input_tmp, care_map_path))
    if output_zip:
      OPTIONS.replace_updated_files_list.append(care_map_path)


def AddPackRadioImages(output_zip, images):
  """Copies images listed in META/pack_radioimages.txt from RADIO/ to IMAGES/.

  Args:
    output_zip: The output zip file (needs to be already open), or None to
        write images to OPTIONS.input_tmp/.
    images: A list of image names.

  Raises:
    AssertionError: If a listed image can't be found.
  """
  for image in images:
    img_name = image.strip()
    _, ext = os.path.splitext(img_name)
    if not ext:
      img_name += ".img"

    prebuilt_path = os.path.join(OPTIONS.input_tmp, "IMAGES", img_name)
    if os.path.exists(prebuilt_path):
      logger.info("%s already exists, no need to overwrite...", img_name)
      continue

    img_radio_path = os.path.join(OPTIONS.input_tmp, "RADIO", img_name)
    assert os.path.exists(img_radio_path), \
        "Failed to find %s at %s" % (img_name, img_radio_path)

    if output_zip:
      common.ZipWrite(output_zip, img_radio_path, "IMAGES/" + img_name)
    else:
      shutil.copy(img_radio_path, prebuilt_path)


def AddSuperEmpty(output_zip):
  """Create a super_empty.img and store it in output_zip."""

  img = OutputFile(output_zip, OPTIONS.input_tmp, "IMAGES", "super_empty.img")
  build_super_image.BuildSuperImage(OPTIONS.info_dict, img.name)
  img.Write()


def AddSuperSplit(output_zip):
  """Create split super_*.img and store it in output_zip."""

  outdir = os.path.join(OPTIONS.input_tmp, "OTA")
  built = build_super_image.BuildSuperImage(OPTIONS.input_tmp, outdir)

  if built:
    for dev in OPTIONS.info_dict['super_block_devices'].strip().split():
      img = OutputFile(output_zip, OPTIONS.input_tmp, "OTA",
                       "super_" + dev + ".img")
      img.Write()


def ReplaceUpdatedFiles(zip_filename, files_list):
  """Updates all the ZIP entries listed in files_list.

  For now the list includes META/care_map.pb, and the related files under
  SYSTEM/ after rebuilding recovery.
  """
  common.ZipDelete(zip_filename, files_list)
  output_zip = zipfile.ZipFile(zip_filename, "a",
                               compression=zipfile.ZIP_DEFLATED,
                               allowZip64=True)
  for item in files_list:
    file_path = os.path.join(OPTIONS.input_tmp, item)
    assert os.path.exists(file_path)
    common.ZipWrite(output_zip, file_path, arcname=item)
  common.ZipClose(output_zip)


def AddImagesToTargetFiles(filename):
  """Creates and adds images (boot/recovery/system/...) to a target_files.zip.

  It works with either a zip file (zip mode), or a directory that contains the
  files to be packed into a target_files.zip (dir mode). The latter is used when
  being called from build/make/core/Makefile.

  The images will be created under IMAGES/ in the input target_files.zip.

  Args:
    filename: the target_files.zip, or the zip root directory.
  """
  if os.path.isdir(filename):
    OPTIONS.input_tmp = os.path.abspath(filename)
  else:
    OPTIONS.input_tmp = common.UnzipTemp(filename)

  if not OPTIONS.add_missing:
    if os.path.isdir(os.path.join(OPTIONS.input_tmp, "IMAGES")):
      logger.warning("target_files appears to already contain images.")
      sys.exit(1)

  OPTIONS.info_dict = common.LoadInfoDict(OPTIONS.input_tmp, repacking=True)

  has_recovery = OPTIONS.info_dict.get("no_recovery") != "true"

  # {vendor,odm,product,product_services}.img are unlike system.img or
  # system_other.img. Because it could be built from source, or dropped into
  # target_files.zip as a prebuilt blob. We consider either of them as
  # {vendor,product,product_services}.img being available, which could be
  # used when generating vbmeta.img for AVB.
  has_vendor = (os.path.isdir(os.path.join(OPTIONS.input_tmp, "VENDOR")) or
                os.path.exists(os.path.join(OPTIONS.input_tmp, "IMAGES",
                                            "vendor.img")))
  has_odm = (os.path.isdir(os.path.join(OPTIONS.input_tmp, "ODM")) or
             os.path.exists(os.path.join(OPTIONS.input_tmp, "IMAGES",
                                         "odm.img")))
  has_product = (os.path.isdir(os.path.join(OPTIONS.input_tmp, "PRODUCT")) or
                 os.path.exists(os.path.join(OPTIONS.input_tmp, "IMAGES",
                                             "product.img")))
  has_product_services = (os.path.isdir(os.path.join(OPTIONS.input_tmp,
                                                     "PRODUCT_SERVICES")) or
                          os.path.exists(os.path.join(OPTIONS.input_tmp,
                                                      "IMAGES",
                                                      "product_services.img")))
  has_system = os.path.isdir(os.path.join(OPTIONS.input_tmp, "SYSTEM"))
  has_system_other = os.path.isdir(os.path.join(OPTIONS.input_tmp,
                                                "SYSTEM_OTHER"))

  # Set up the output destination. It writes to the given directory for dir
  # mode; otherwise appends to the given ZIP.
  if os.path.isdir(filename):
    output_zip = None
  else:
    output_zip = zipfile.ZipFile(filename, "a",
                                 compression=zipfile.ZIP_DEFLATED,
                                 allowZip64=True)

  # Always make input_tmp/IMAGES available, since we may stage boot / recovery
  # images there even under zip mode. The directory will be cleaned up as part
  # of OPTIONS.input_tmp.
  images_dir = os.path.join(OPTIONS.input_tmp, "IMAGES")
  if not os.path.isdir(images_dir):
    os.makedirs(images_dir)

  # A map between partition names and their paths, which could be used when
  # generating AVB vbmeta image.
  partitions = dict()

  def banner(s):
    logger.info("\n\n++++ " + s + " ++++\n\n")

  banner("boot")
  # common.GetBootableImage() returns the image directly if present.
  boot_image = common.GetBootableImage(
      "IMAGES/boot.img", "boot.img", OPTIONS.input_tmp, "BOOT")
  # boot.img may be unavailable in some targets (e.g. aosp_arm64).
  if boot_image:
    partitions['boot'] = os.path.join(OPTIONS.input_tmp, "IMAGES", "boot.img")
    if not os.path.exists(partitions['boot']):
      boot_image.WriteToDir(OPTIONS.input_tmp)
      if output_zip:
        boot_image.AddToZip(output_zip)

  recovery_image = None
  if has_recovery:
    banner("recovery")
    recovery_image = common.GetBootableImage(
        "IMAGES/recovery.img", "recovery.img", OPTIONS.input_tmp, "RECOVERY")
    assert recovery_image, "Failed to create recovery.img."
    partitions['recovery'] = os.path.join(
        OPTIONS.input_tmp, "IMAGES", "recovery.img")
    if not os.path.exists(partitions['recovery']):
      recovery_image.WriteToDir(OPTIONS.input_tmp)
      if output_zip:
        recovery_image.AddToZip(output_zip)

      banner("recovery (two-step image)")
      # The special recovery.img for two-step package use.
      recovery_two_step_image = common.GetBootableImage(
          "IMAGES/recovery-two-step.img", "recovery-two-step.img",
          OPTIONS.input_tmp, "RECOVERY", two_step_image=True)
      assert recovery_two_step_image, "Failed to create recovery-two-step.img."
      recovery_two_step_image_path = os.path.join(
          OPTIONS.input_tmp, "IMAGES", "recovery-two-step.img")
      if not os.path.exists(recovery_two_step_image_path):
        recovery_two_step_image.WriteToDir(OPTIONS.input_tmp)
        if output_zip:
          recovery_two_step_image.AddToZip(output_zip)

  if has_system:
    banner("system")
    partitions['system'] = AddSystem(
        output_zip, recovery_img=recovery_image, boot_img=boot_image)

  if has_vendor:
    banner("vendor")
    partitions['vendor'] = AddVendor(output_zip)

  if has_product:
    banner("product")
    partitions['product'] = AddProduct(output_zip)

  if has_product_services:
    banner("product_services")
    partitions['product_services'] = AddProductServices(output_zip)

  if has_odm:
    banner("odm")
    partitions['odm'] = AddOdm(output_zip)

  if has_system_other:
    banner("system_other")
    AddSystemOther(output_zip)

  if not OPTIONS.is_signing:
    banner("userdata")
    AddUserdata(output_zip)
    banner("cache")
    AddCache(output_zip)

  if OPTIONS.info_dict.get("board_bpt_enable") == "true":
    banner("partition-table")
    AddPartitionTable(output_zip)

  if OPTIONS.info_dict.get("has_dtbo") == "true":
    banner("dtbo")
    partitions['dtbo'] = AddDtbo(output_zip)

  if OPTIONS.info_dict.get("avb_enable") == "true":
    # vbmeta_partitions includes the partitions that should be included into
    # top-level vbmeta.img, which are the ones that are not included in any
    # chained VBMeta image plus the chained VBMeta images themselves.
    vbmeta_partitions = common.AVB_PARTITIONS[:]

    vbmeta_system = OPTIONS.info_dict.get("avb_vbmeta_system", "").strip()
    if vbmeta_system:
      banner("vbmeta_system")
      partitions["vbmeta_system"] = AddVBMeta(
          output_zip, partitions, "vbmeta_system", vbmeta_system.split())
      vbmeta_partitions = [
          item for item in vbmeta_partitions
          if item not in vbmeta_system.split()]
      vbmeta_partitions.append("vbmeta_system")

    vbmeta_vendor = OPTIONS.info_dict.get("avb_vbmeta_vendor", "").strip()
    if vbmeta_vendor:
      banner("vbmeta_vendor")
      partitions["vbmeta_vendor"] = AddVBMeta(
          output_zip, partitions, "vbmeta_vendor", vbmeta_vendor.split())
      vbmeta_partitions = [
          item for item in vbmeta_partitions
          if item not in vbmeta_vendor.split()]
      vbmeta_partitions.append("vbmeta_vendor")

    banner("vbmeta")
    AddVBMeta(output_zip, partitions, "vbmeta", vbmeta_partitions)

  if OPTIONS.info_dict.get("use_dynamic_partitions") == "true":
    banner("super_empty")
    AddSuperEmpty(output_zip)

  if OPTIONS.info_dict.get("build_super_partition") == "true":
    if OPTIONS.info_dict.get(
        "build_retrofit_dynamic_partitions_ota_package") == "true":
      banner("super split images")
      AddSuperSplit(output_zip)

  banner("radio")
  ab_partitions_txt = os.path.join(OPTIONS.input_tmp, "META",
                                   "ab_partitions.txt")
  if os.path.exists(ab_partitions_txt):
    with open(ab_partitions_txt, 'r') as f:
      ab_partitions = f.readlines()

    # For devices using A/B update, make sure we have all the needed images
    # ready under IMAGES/ or RADIO/.
    CheckAbOtaImages(output_zip, ab_partitions)

    # Generate care_map.pb for ab_partitions, then write this file to
    # target_files package.
    AddCareMapForAbOta(output_zip, ab_partitions, partitions)

  # Radio images that need to be packed into IMAGES/, and product-img.zip.
  pack_radioimages_txt = os.path.join(
      OPTIONS.input_tmp, "META", "pack_radioimages.txt")
  if os.path.exists(pack_radioimages_txt):
    with open(pack_radioimages_txt, 'r') as f:
      AddPackRadioImages(output_zip, f.readlines())

  if output_zip:
    common.ZipClose(output_zip)
    if OPTIONS.replace_updated_files_list:
      ReplaceUpdatedFiles(output_zip.filename,
                          OPTIONS.replace_updated_files_list)


def main(argv):
  def option_handler(o, a):
    if o in ("-a", "--add_missing"):
      OPTIONS.add_missing = True
    elif o in ("-r", "--rebuild_recovery",):
      OPTIONS.rebuild_recovery = True
    elif o == "--replace_verity_private_key":
      OPTIONS.replace_verity_private_key = (True, a)
    elif o == "--replace_verity_public_key":
      OPTIONS.replace_verity_public_key = (True, a)
    elif o == "--is_signing":
      OPTIONS.is_signing = True
    else:
      return False
    return True

  args = common.ParseOptions(
      argv, __doc__, extra_opts="ar",
      extra_long_opts=["add_missing", "rebuild_recovery",
                       "replace_verity_public_key=",
                       "replace_verity_private_key=",
                       "is_signing"],
      extra_option_handler=option_handler)

  if len(args) != 1:
    common.Usage(__doc__)
    sys.exit(1)

  common.InitLogging()

  AddImagesToTargetFiles(args[0])
  logger.info("done.")

if __name__ == '__main__':
  try:
    common.CloseInheritedPipes()
    main(sys.argv[1:])
  except common.ExternalError:
    logger.exception("\n   ERROR:\n")
    sys.exit(1)
  finally:
    common.Cleanup()
