build_utils.py 文件源码

def AddToZipHermetic(zip_file, zip_path, src_path=None, data=None,
                     compress=None):
  """Adds a file to the given ZipFile with a hard-coded modified time.

  Args:
    zip_file: ZipFile instance to add the file to.
    zip_path: Destination path within the zip file.
    src_path: Path of the source file. Mutually exclusive with |data|.
    data: File data as a string.
    compress: Whether to enable compression. Default is take from ZipFile
        constructor.
  """
  assert (src_path is None) != (data is None), (
      '|src_path| and |data| are mutually exclusive.')
  CheckZipPath(zip_path)
  zipinfo = zipfile.ZipInfo(filename=zip_path, date_time=HERMETIC_TIMESTAMP)
  zipinfo.external_attr = _HERMETIC_FILE_ATTR

  if src_path and os.path.islink(src_path):
    zipinfo.filename = zip_path
    zipinfo.external_attr |= stat.S_IFLNK << 16L # mark as a symlink
    zip_file.writestr(zipinfo, os.readlink(src_path))
    return

  if src_path:
    with file(src_path) as f:
      data = f.read()

  # zipfile will deflate even when it makes the file bigger. To avoid
  # growing files, disable compression at an arbitrary cut off point.
  if len(data) < 16:
    compress = False

  # None converts to ZIP_STORED, when passed explicitly rather than the
  # default passed to the ZipFile constructor.
  compress_type = zip_file.compression
  if compress is not None:
    compress_type = zipfile.ZIP_DEFLATED if compress else zipfile.ZIP_STORED
  zip_file.writestr(zipinfo, data, compress_type)