import tempfile

from oslo.config import cfg


def get_config_from_dict(values, groups={}):
    groups.setdefault('DEFAULT', {}).update(values)

    with tempfile.NamedTemporaryFile() as f:
        for group, values in groups.iteritems():
            f.write('[%s]\n' % group)
            for key, value in values.iteritems():
                f.write('%s = %s\n' % (key, value))
            f.flush()

            conf = cfg.ConfigOpts()
            conf(args=[], default_config_files=[f.name])
            return conf