conftest.py 文件源码

def cdload(path=None):
    """Load the ISO into the virtual CD-ROM device.

    :param path: File path of ISO file to load if not sample.iso.
    """
    path = path or 'sample.iso'

    try:
        run(['cdemu', 'load', '0', path])
    except subprocess.CalledProcessError as exc:
        if b'AlreadyLoaded' not in exc.stderr:
            raise
        loaded = cdstatus()
        if not loaded or os.path.realpath(loaded) != os.path.realpath(path):
            cdunload()
            return cdload(path)

    for _ in range(50):
        if os.path.exists('/dev/cdrom'):
            return
        time.sleep(0.1)
    if not os.path.exists('/dev/cdrom'):
        raise IOError('Failed to load cdemu device!')