#!/usr/bin/env python
#
# Copyright (C) 2008 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, produces an image zipfile suitable for
use with 'fastboot update'.

Usage:  img_from_target_files [flags] input_target_files output_image_zip

  -b  (--board_config)  <file>
      Specifies a BoardConfig.mk file containing image max sizes
      against which the generated image files are checked.

"""

import sys

if sys.hexversion < 0x02040000:
  print >> sys.stderr, "Python 2.4 or newer is required."
  sys.exit(1)

import os
import re
import shutil
import subprocess
import tempfile
import zipfile

# missing in Python 2.4 and before
if not hasattr(os, "SEEK_SET"):
  os.SEEK_SET = 0

import common

OPTIONS = common.OPTIONS


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

  print "creating userdata.img..."

  # 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", and build the image from that.
  temp_dir = tempfile.mkdtemp()
  user_dir = os.path.join(temp_dir, "data")
  os.mkdir(user_dir)
  img = tempfile.NamedTemporaryFile()

  p = common.Run(["mkyaffs2image", "-f", user_dir, img.name])
  p.communicate()
  assert p.returncode == 0, "mkyaffs2image of userdata.img image failed"

  common.CheckSize(img.name, "userdata.img")
  output_zip.write(img.name, "userdata.img")
  img.close()
  os.rmdir(user_dir)
  os.rmdir(temp_dir)


def AddSystem(output_zip):
  """Turn the contents of SYSTEM into a system image and store it in
  output_zip."""

  print "creating system.img..."

  img = tempfile.NamedTemporaryFile()

  # 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.
  os.symlink(os.path.join(OPTIONS.input_tmp, "SYSTEM"),
             os.path.join(OPTIONS.input_tmp, "system"))

  p = common.Run(["mkyaffs2image", "-f",
                  os.path.join(OPTIONS.input_tmp, "system"), img.name])
  p.communicate()
  assert p.returncode == 0, "mkyaffs2image of system.img image failed"

  img.seek(os.SEEK_SET, 0)
  data = img.read()
  img.close()

  common.CheckSize(data, "system.img")
  common.ZipWriteStr(output_zip, "system.img", data)


def CopyInfo(output_zip):
  """Copy the android-info.txt file from the input to the output."""
  output_zip.write(os.path.join(OPTIONS.input_tmp, "OTA", "android-info.txt"),
                   "android-info.txt")


def main(argv):

  def option_handler(o, a):
    if o in ("-b", "--board_config"):
      common.LoadBoardConfig(a)
      return True
    else:
      return False

  args = common.ParseOptions(argv, __doc__,
                             extra_opts="b:",
                             extra_long_opts=["board_config="],
                             extra_option_handler=option_handler)

  if len(args) != 2:
    common.Usage(__doc__)
    sys.exit(1)

  if not OPTIONS.max_image_size:
    print
    print "  WARNING:  No board config specified; will not check image"
    print "  sizes against limits.  Use -b to make sure the generated"
    print "  images don't exceed partition sizes."
    print

  OPTIONS.input_tmp = common.UnzipTemp(args[0])

  output_zip = zipfile.ZipFile(args[1], "w", compression=zipfile.ZIP_DEFLATED)

  common.AddBoot(output_zip)
  common.AddRecovery(output_zip)
  AddSystem(output_zip)
  AddUserdata(output_zip)
  CopyInfo(output_zip)

  print "cleaning up..."
  output_zip.close()
  shutil.rmtree(OPTIONS.input_tmp)

  print "done."


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