Try to fix system.img in update zip file.

    build_command.append(os.path.join(OPTIONS.input_tmp, "system"))

    build_command.append(img.name)

  p = common.Run(build_command)

  p.communicate()

  assert p.returncode == 0, "build system.img image failed"

  # p = common.Run(build_command)

  # p.communicate()

  # assert p.returncode == 0, "build system.img image failed"

  # TODO: Why the above common.Run() generate different system.img for crespo?

  str_command = "mkyaffs2image -f ";

  if OPTIONS.mkyaffs2_extra_flags is not None:

    str_command = str_command + OPTIONS.mkyaffs2_extra_flags

  str_command = str_command + " " + os.path.join(OPTIONS.input_tmp, "system") + " " + img.name

  print "running " + str_command

  exit_code = os.system(str_command)

  assert exit_code == 0, "build system.img image failed"

  img.seek(os.SEEK_SET, 0)

  data = img.read()