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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:

def set_startup_disk(path):
    '''
    Set the current startup disk to the indicated path. Use
    ``system.list_startup_disks`` to find valid startup disks on the system.

    :param str path: The valid startup disk path

    :return: True if successful, False if not
    :rtype: bool

    CLI Example:

    .. code-block:: bash

        salt '*' system.set_startup_disk /System/Library/CoreServices
    '''
    if path not in list_startup_disks():
        msg = 'Invalid value passed for path.\n' \
              'Must be a valid startup disk as found in ' \
              'system.list_startup_disks.\n' \
              'Passed: {0}'.format(path)
        raise SaltInvocationError(msg)

    cmd = 'systemsetup -setstartupdisk {0}'.format(path)
    __utils__['mac_utils.execute_return_result'](cmd)

    return __utils__['mac_utils.confirm_updated'](
        path,
        get_startup_disk,
    )