#!/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>
      Deprecated.

  -f  (--fs_type) <value>
      The file system type of the user image files to be created.
      It can be ext fs variants, such as ext2, ext3, ext4, etc.
      Default is yaffs.

"""

import sys

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

import errno
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

class UserImageOptions(object): pass
USERIMAGE_OPTIONS = UserImageOptions()
USERIMAGE_OPTIONS.fs_type = None


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()

  build_command = []
  if USERIMAGE_OPTIONS.fs_type is not None and USERIMAGE_OPTIONS.fs_type.startswith("ext"):
    build_command = ["mkuserimg.sh",
                     user_dir, img.name, USERIMAGE_OPTIONS.fs_type, "userdata"]
    if "userdata.img" in OPTIONS.max_image_size:
      build_command.append(str(OPTIONS.max_image_size["userdata.img"]))
  else:
    build_command = ["mkyaffs2image", "-f",
                     user_dir, img.name]

  p = common.Run(build_command);
  p.communicate()
  assert p.returncode == 0, "build 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.
  try:
    os.symlink(os.path.join(OPTIONS.input_tmp, "SYSTEM"),
               os.path.join(OPTIONS.input_tmp, "system"))
  except OSError, e:
      # bogus error on my mac version?
      #   File "./build/tools/releasetools/img_from_target_files", line 86, in AddSystem
      #     os.path.join(OPTIONS.input_tmp, "system"))
      # OSError: [Errno 17] File exists
    if (e.errno == errno.EEXIST):
      pass

  build_command = []
  if USERIMAGE_OPTIONS.fs_type is not None and USERIMAGE_OPTIONS.fs_type.startswith("ext"):
    build_command = ["mkuserimg.sh",
                     os.path.join(OPTIONS.input_tmp, "system"), img.name,
                     USERIMAGE_OPTIONS.fs_type, "system"]
    if "system.img" in OPTIONS.max_image_size:
      build_command.append(str(OPTIONS.max_image_size["system.img"]))
  else:
    build_command = ["mkyaffs2image", "-f",
                     os.path.join(OPTIONS.input_tmp, "system"), img.name]

  p = common.Run(build_command)
  p.communicate()
  assert p.returncode == 0, "build 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"):
      pass       # deprecated
    elif o in ("-f", "--fs_type"):
      USERIMAGE_OPTIONS.fs_type = a
    else:
      return False
    return True

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

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

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

  info = common.LoadInfoDict()
  common.LoadMaxSizes(info)
  if not OPTIONS.max_image_size:
    print
    print "  WARNING:  Failed to load max image sizes; will not enforce"
    print "  image size limits."
    print

  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)