func selectGraphDriver(logger lager.Logger, name string, graphRoot string) (graphdriver.Driver, error) {
// silence docker graph debug logging; we'll do our own warning for non-aufs
// driver selection
logrus.SetLevel(logrus.WarnLevel)
var driver graphdriver.Driver
var err error
if name == "auto" {
driver, err = graphdriver.New(graphRoot, nil)
} else {
driver, err = graphdriver.GetDriver(name, graphRoot, nil)
}
if err != nil {
return nil, err
}
driverName := driver.String()
if driverName != "aufs" {
logger.Info("unsupported-graph-driver", lager.Data{"name": driverName})
}
return driver, nil
}