def METHOD_NAME(tmp_path, first_app):
    command = LinuxSystemBuildCommand(
        logger=Log(),
        console=Console(),
        base_path=tmp_path / "base_path",
        data_path=tmp_path / "briefcase",
        apps={"first": first_app},
    )
    command.tools.host_os = "Linux"
    command.tools.host_arch = "wonky"
    # Mock subprocess
    command.tools.subprocess = MagicMock()
    return command