Function ensure_different_files

Lib/pathlib/_os.py:284–303

Raise OSError(EINVAL) if both paths refer to the same file.

(source, target)

def ensure_different_files(source, target):
    """
    Raise OSError(EINVAL) if both paths refer to the same file.
    """
    try:
        source_file_id = source.info._file_id
        target_file_id = target.info._file_id
    except AttributeError:
        if source != target:
            return
    else:
        try:
            if source_file_id() != target_file_id():
                return
        except (OSError, ValueError):
            return
    err = OSError(EINVAL, "Source and target are the same file")
    err.filename = vfspath(source)
    err.filename2 = vfspath(target)
    raise err