def _catch_bad_stdin_stdout_requests()

in src/aws_encryption_sdk_cli/__init__.py [0:0]

• 6 lines of code
• 6 McCabe index (conditional complexity)

def _catch_bad_stdin_stdout_requests(source, destination):
    # type: (str, str) -> None
    """Catches bad requests based on characteristics of source and destination when
    source might be stdin or stdout.

    :param str source: Identifier for the source (filesystem path or ``-`` for stdin)
    :param str destination: Identifier for the destination (filesystem path or ``-`` for stdout)
    :raises BadUserArgument: if source and destination are the same
    :raises BadUserArgument: if source is stdin and destination is a directory
    """
    acting_as_pipe = destination == "-" and source == "-"
    if not acting_as_pipe and os.path.realpath(source) == os.path.realpath(destination):
        raise BadUserArgumentError("Destination and source cannot be the same")

    if source == "-" and os.path.isdir(destination):
        raise BadUserArgumentError("Destination may not be a directory when source is stdin")