Start a launchd service.  Raises an error if the service fails to start

    .. note::
        To start a service in macOS the service must be enabled first. Use
        ``service.enable`` to enable the service.

    :param str name: Service label, file name, or full path

    :param str runas: User to run launchctl commands

    :return: ``True`` if successful or if the service is already running
    :rtype: bool

    CLI Example:

    .. code-block:: bash

        salt '*' service.start org.cups.cupsd

def start(name, runas=None):
    '''
    Start a launchd service.  Raises an error if the service fails to start

    .. note::
        To start a service in macOS the service must be enabled first. Use
        ``service.enable`` to enable the service.

    :param str name: Service label, file name, or full path

    :param str runas: User to run launchctl commands

    :return: ``True`` if successful or if the service is already running
    :rtype: bool

    CLI Example:

    .. code-block:: bash

        salt '*' service.start org.cups.cupsd
    '''
    # Get the domain target.
    domain_target, path = _get_domain_target(name)

    # Load (bootstrap) the service: will raise an error if it fails
    return launchctl('bootstrap', domain_target, path, runas=runas)