#!/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 target_files
"""

import sys

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

import datetime
import errno
import os
import shlex
import shutil
import subprocess
import tempfile
import zipfile

import build_image
import common

OPTIONS = common.OPTIONS

OPTIONS.add_missing = False
OPTIONS.rebuild_recovery = False
OPTIONS.replace_verity_public_key = False
OPTIONS.replace_verity_private_key = False
OPTIONS.verity_signer_path = None

def AddSystem(output_zip, prefix="IMAGES/", 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."""

  prebuilt_path = os.path.join(OPTIONS.input_tmp, prefix, "system.img")
  if os.path.exists(prebuilt_path):
    print "system.img already exists in %s, no need to rebuild..." % (prefix,)
    return prebuilt_path

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

  if OPTIONS.rebuild_recovery:
    print "Building new recovery patch"
    common.MakeRecoveryPatch(OPTIONS.input_tmp, output_sink, recovery_img,
                             boot_img, info_dict=OPTIONS.info_dict)

  block_list = common.MakeTempFile(prefix="system-blocklist-", suffix=".map")
  imgname = BuildSystem(OPTIONS.input_tmp, OPTIONS.info_dict,
                        block_list=block_list)

  # If requested, calculate and add dm-verity integrity hashes and
  # metadata to system.img.
  if OPTIONS.info_dict.get("board_bvb_enable", None) == "true":
    bvbtool = os.getenv('BVBTOOL') or "bvbtool"
    cmd = [bvbtool, "add_image_hashes", "--image", imgname]
    args = OPTIONS.info_dict.get("board_bvb_add_image_hashes_args", None)
    if args and args.strip():
      cmd.extend(shlex.split(args))
    p = common.Run(cmd, stdout=subprocess.PIPE)
    p.communicate()
    assert p.returncode == 0, "bvbtool add_image_hashes of %s image failed" % (
      os.path.basename(OPTIONS.input_tmp),)

  common.ZipWrite(output_zip, imgname, prefix + "system.img")
  common.ZipWrite(output_zip, block_list, prefix + "system.map")
  return imgname


def BuildSystem(input_dir, info_dict, block_list=None):
  """Build the (sparse) system image and return the name of a temp
  file containing it."""
  return CreateImage(input_dir, info_dict, "system", block_list=block_list)


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

  prebuilt_path = os.path.join(OPTIONS.input_tmp, prefix, "vendor.img")
  if os.path.exists(prebuilt_path):
    print "vendor.img already exists in %s, no need to rebuild..." % (prefix,)
    return

  block_list = common.MakeTempFile(prefix="vendor-blocklist-", suffix=".map")
  imgname = BuildVendor(OPTIONS.input_tmp, OPTIONS.info_dict,
                        block_list=block_list)
  common.ZipWrite(output_zip, imgname, prefix + "vendor.img")
  common.ZipWrite(output_zip, block_list, prefix + "vendor.map")


def BuildVendor(input_dir, info_dict, block_list=None):
  """Build the (sparse) vendor image and return the name of a temp
  file containing it."""
  return CreateImage(input_dir, info_dict, "vendor", block_list=block_list)


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

  img = common.MakeTempFile(prefix=what + "-", suffix=".img")

  # The name of the directory it is making an image out of matters to
  # mkyaffs2image.  It wants "system" but we have a directory named
  # "SYSTEM", so create a symlink.
  try:
    os.symlink(os.path.join(input_dir, what.upper()),
               os.path.join(input_dir, what))
  except OSError as e:
    # bogus error on my mac version?
    #   File "./build/tools/releasetools/img_from_target_files"
    #     os.path.join(OPTIONS.input_tmp, "system"))
    # OSError: [Errno 17] File exists
    if e.errno == errno.EEXIST:
      pass

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

  # Use a fixed timestamp (01/01/2009) when packaging the image.
  # Bug: 24377993
  epoch = datetime.datetime.fromtimestamp(0)
  timestamp = (datetime.datetime(2009, 1, 1) - epoch).total_seconds()
  image_props["timestamp"] = int(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

  succ = build_image.BuildImage(os.path.join(input_dir, what),
                                image_props, img)
  assert succ, "build " + what + ".img image failed"

  return img


def AddUserdata(output_zip, prefix="IMAGES/"):
  """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.
  """

  prebuilt_path = os.path.join(OPTIONS.input_tmp, prefix, "userdata.img")
  if os.path.exists(prebuilt_path):
    print "userdata.img already exists in %s, no need to rebuild..." % (prefix,)
    return

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

  print "creating userdata.img..."

  # Use a fixed timestamp (01/01/2009) when packaging the image.
  # Bug: 24377993
  epoch = datetime.datetime.fromtimestamp(0)
  timestamp = (datetime.datetime(2009, 1, 1) - epoch).total_seconds()
  image_props["timestamp"] = int(timestamp)

  # The name of the directory it is making an image out of matters to
  # mkyaffs2image.  So we create a temp dir, and within it we create an
  # empty dir named "data", or a symlink to the DATA dir,
  # and build the image from that.
  temp_dir = tempfile.mkdtemp()
  user_dir = os.path.join(temp_dir, "data")
  empty = (OPTIONS.info_dict.get("userdata_img_with_data") != "true")
  if empty:
    # Create an empty dir.
    os.mkdir(user_dir)
  else:
    # Symlink to the DATA dir.
    os.symlink(os.path.join(OPTIONS.input_tmp, "DATA"),
               user_dir)

  img = tempfile.NamedTemporaryFile()

  fstab = OPTIONS.info_dict["fstab"]
  if fstab:
    image_props["fs_type"] = fstab["/data"].fs_type
  succ = build_image.BuildImage(user_dir, image_props, img.name)
  assert succ, "build userdata.img image failed"

  common.CheckSize(img.name, "userdata.img", OPTIONS.info_dict)
  common.ZipWrite(output_zip, img.name, prefix + "userdata.img")
  img.close()
  shutil.rmtree(temp_dir)


def AddPartitionTable(output_zip, prefix="IMAGES/"):
  """Create a partition table image and store it in output_zip."""

  _, img_file_name = tempfile.mkstemp()
  _, bpt_file_name = tempfile.mkstemp()

  # use BPTTOOL from environ, or "bpttool" if empty or not set.
  bpttool = os.getenv("BPTTOOL") or "bpttool"
  cmd = [bpttool, "make_table", "--output_json", bpt_file_name,
         "--output_gpt", img_file_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))

  p = common.Run(cmd, stdout=subprocess.PIPE)
  p.communicate()
  assert p.returncode == 0, "bpttool make_table failed"

  common.ZipWrite(output_zip, img_file_name, prefix + "partition-table.img")
  common.ZipWrite(output_zip, bpt_file_name, prefix + "partition-table.bpt")


def AddCache(output_zip, prefix="IMAGES/"):
  """Create an empty cache image and store it in output_zip."""

  prebuilt_path = os.path.join(OPTIONS.input_tmp, prefix, "cache.img")
  if os.path.exists(prebuilt_path):
    print "cache.img already exists in %s, no need to rebuild..." % (prefix,)
    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

  print "creating cache.img..."

  # Use a fixed timestamp (01/01/2009) when packaging the image.
  # Bug: 24377993
  epoch = datetime.datetime.fromtimestamp(0)
  timestamp = (datetime.datetime(2009, 1, 1) - epoch).total_seconds()
  image_props["timestamp"] = int(timestamp)

  # The name of the directory it is making an image out of matters to
  # mkyaffs2image.  So we create a temp dir, and within it we create an
  # empty dir named "cache", and build the image from that.
  temp_dir = tempfile.mkdtemp()
  user_dir = os.path.join(temp_dir, "cache")
  os.mkdir(user_dir)
  img = tempfile.NamedTemporaryFile()

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

  common.CheckSize(img.name, "cache.img", OPTIONS.info_dict)
  common.ZipWrite(output_zip, img.name, prefix + "cache.img")
  img.close()
  os.rmdir(user_dir)
  os.rmdir(temp_dir)


def AddImagesToTargetFiles(filename):
  OPTIONS.input_tmp, input_zip = common.UnzipTemp(filename)

  if not OPTIONS.add_missing:
    for n in input_zip.namelist():
      if n.startswith("IMAGES/"):
        print "target_files appears to already contain images."
        sys.exit(1)

  try:
    input_zip.getinfo("VENDOR/")
    has_vendor = True
  except KeyError:
    has_vendor = False

  OPTIONS.info_dict = common.LoadInfoDict(input_zip, OPTIONS.input_tmp)

  common.ZipClose(input_zip)
  output_zip = zipfile.ZipFile(filename, "a",
                               compression=zipfile.ZIP_DEFLATED)

  has_recovery = (OPTIONS.info_dict.get("no_recovery") != "true")
  system_root_image = (OPTIONS.info_dict.get("system_root_image", None) == "true")
  board_bvb_enable = (OPTIONS.info_dict.get("board_bvb_enable", None) == "true")

  # Brillo Verified Boot is incompatible with certain
  # configurations. Explicitly check for these.
  if board_bvb_enable:
    assert not has_recovery, "has_recovery incompatible with bvb"
    assert not system_root_image, "system_root_image incompatible with bvb"
    assert not OPTIONS.rebuild_recovery, "rebuild_recovery incompatible with bvb"
    assert not has_vendor, "VENDOR images currently incompatible with bvb"

  def banner(s):
    print "\n\n++++ " + s + " ++++\n\n"

  prebuilt_path = os.path.join(OPTIONS.input_tmp, "IMAGES", "boot.img")
  boot_image = None
  if os.path.exists(prebuilt_path):
    banner("boot")
    print "boot.img already exists in IMAGES/, no need to rebuild..."
    if OPTIONS.rebuild_recovery:
      boot_image = common.GetBootableImage(
          "IMAGES/boot.img", "boot.img", OPTIONS.input_tmp, "BOOT")
  else:
    if board_bvb_enable:
      # With Brillo Verified Boot, we need to build system.img before
      # boot.img since the latter includes the dm-verity root hash and
      # salt for the former.
      pass
    else:
      banner("boot")
      boot_image = common.GetBootableImage(
        "IMAGES/boot.img", "boot.img", OPTIONS.input_tmp, "BOOT")
      if boot_image:
        boot_image.AddToZip(output_zip)

  recovery_image = None
  if has_recovery:
    banner("recovery")
    prebuilt_path = os.path.join(OPTIONS.input_tmp, "IMAGES", "recovery.img")
    if os.path.exists(prebuilt_path):
      print "recovery.img already exists in IMAGES/, no need to rebuild..."
      if OPTIONS.rebuild_recovery:
        recovery_image = common.GetBootableImage(
            "IMAGES/recovery.img", "recovery.img", OPTIONS.input_tmp,
            "RECOVERY")
    else:
      recovery_image = common.GetBootableImage(
          "IMAGES/recovery.img", "recovery.img", OPTIONS.input_tmp, "RECOVERY")
      if recovery_image:
        recovery_image.AddToZip(output_zip)

  banner("system")
  system_img_path = AddSystem(
    output_zip, recovery_img=recovery_image, boot_img=boot_image)
  if OPTIONS.info_dict.get("board_bvb_enable", None) == "true":
    # If we're using Brillo Verified Boot, we can now build boot.img
    # given that we have system.img.
    banner("boot")
    boot_image = common.GetBootableImage(
      "IMAGES/boot.img", "boot.img", OPTIONS.input_tmp, "BOOT",
      system_img_path=system_img_path)
    if boot_image:
      boot_image.AddToZip(output_zip)
  if has_vendor:
    banner("vendor")
    AddVendor(output_zip)
  banner("userdata")
  AddUserdata(output_zip)
  banner("cache")
  AddCache(output_zip)
  if OPTIONS.info_dict.get("board_bpt_enable", None) == "true":
    banner("partition-table")
    AddPartitionTable(output_zip)

  # For devices using A/B update, copy over images from RADIO/ and/or
  # VENDOR_IMAGES/ to IMAGES/ and make sure we have all the needed
  # images ready under IMAGES/. All images should have '.img' as extension.
  ab_partitions = os.path.join(OPTIONS.input_tmp, "META", "ab_partitions.txt")
  if os.path.exists(ab_partitions):
    with open(ab_partitions, 'r') as f:
      lines = f.readlines()
    for line in lines:
      img_name = line.strip() + ".img"
      img_radio_path = os.path.join(OPTIONS.input_tmp, "RADIO", img_name)
      img_vendor_dir = os.path.join(
        OPTIONS.input_tmp, "VENDOR_IMAGES")
      if os.path.exists(img_radio_path):
        common.ZipWrite(output_zip, img_radio_path,
                        os.path.join("IMAGES", img_name))
      else:
        for root, _, files in os.walk(img_vendor_dir):
          if img_name in files:
            common.ZipWrite(output_zip, os.path.join(root, img_name),
              os.path.join("IMAGES", img_name))
            break

      # Zip spec says: All slashes MUST be forward slashes.
      img_path = 'IMAGES/' + img_name
      assert img_path in output_zip.namelist(), "cannot find " + img_name

  common.ZipClose(output_zip)

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 == "--verity_signer_path":
      OPTIONS.verity_signer_path = a
    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=",
                       "verity_signer_path="],
      extra_option_handler=option_handler)


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

  AddImagesToTargetFiles(args[0])
  print "done."

if __name__ == '__main__':
  try:
    common.CloseInheritedPipes()
    main(sys.argv[1:])
  except common.ExternalError as e:
    print
    print "   ERROR: %s" % (e,)
    print
    sys.exit(1)
  finally:
    common.Cleanup()