Set attributes for the specified device

    CLI Example:

    .. code-block:: bash

        salt '*' disk.tune /dev/sda1 read-ahead=1024 read-write=True

    Valid options are: ``read-ahead``, ``filesystem-read-ahead``,
    ``read-only``, ``read-write``.

    See the ``blockdev(8)`` manpage for a more complete description of these
    options.

def tune(device, **kwargs):
    '''
    Set attributes for the specified device

    CLI Example:

    .. code-block:: bash

        salt '*' disk.tune /dev/sda1 read-ahead=1024 read-write=True

    Valid options are: ``read-ahead``, ``filesystem-read-ahead``,
    ``read-only``, ``read-write``.

    See the ``blockdev(8)`` manpage for a more complete description of these
    options.
    '''

    kwarg_map = {'read-ahead': 'setra',
                 'filesystem-read-ahead': 'setfra',
                 'read-only': 'setro',
                 'read-write': 'setrw'}
    opts = ''
    args = []
    for key in kwargs:
        if key in kwarg_map:
            switch = kwarg_map[key]
            if key != 'read-write':
                args.append(switch.replace('set', 'get'))
            else:
                args.append('getro')
            if kwargs[key] == 'True' or kwargs[key] is True:
                opts += '--{0} '.format(key)
            else:
                opts += '--{0} {1} '.format(switch, kwargs[key])
    cmd = 'blockdev {0}{1}'.format(opts, device)
    out = __salt__['cmd.run'](cmd, python_shell=False).splitlines()
    return dump(device, args)