utils.py 文件源码

def check_dir(directory_to_check=None, required_space=1):
    """Check a directory is usable.

    This function can be used by drivers to check that directories
    they need to write to are usable. This should be called from the
    drivers init function. This function checks that the directory
    exists and then calls check_dir_writable and check_dir_free_space.
    If directory_to_check is not provided the default is to use the
    temp directory.

    :param directory_to_check: the directory to check.
    :param required_space: amount of space to check for in MiB.
    :raises: PathNotFound if directory can not be found
    :raises: DirectoryNotWritable if user is unable to write to the
             directory
    :raises InsufficientDiskSpace: if free space is < required space
    """
    # check if directory_to_check is passed in, if not set to tempdir
    if directory_to_check is None:
        directory_to_check = (
            tempfile.gettempdir()
            if CONF.tempdir is None else CONF.tempdir)

    LOG.debug("checking directory: %s", directory_to_check)

    if not os.path.exists(directory_to_check):
        raise exception.PathNotFound(dir=directory_to_check)

    _check_dir_writable(directory_to_check)
    _check_dir_free_space(directory_to_check, required_space)