// DeviceOpened always returns an error on unsupported platforms
func (hu *HostUtil) DeviceOpened(pathname string) (bool, error) {
	return false, errUnsupported
}

// PathIsDevice always returns an error on unsupported platforms
func (hu *HostUtil) PathIsDevice(pathname string) (bool, error) {
	return true, errUnsupported
}

// GetDeviceNameFromMount always returns an error on unsupported platforms

	hu.mutex.Lock()
	defer hu.mutex.Unlock()

	for _, mp := range hu.MountPoints {
		if mp.Device == pathname {
			return true, nil
		}
	}
	return false, nil
}

// PathIsDevice always returns true
func (hu *FakeHostUtil) PathIsDevice(pathname string) (bool, error) {
	return true, nil
}

// GetDeviceNameFromMount given a mount point, find the volume id

type HostUtils interface {
	// DeviceOpened determines if the device (e.g. /dev/sdc) is in use elsewhere
	// on the system, i.e. still mounted.
	DeviceOpened(pathname string) (bool, error)
	// PathIsDevice determines if a path is a device.
	PathIsDevice(pathname string) (bool, error)
	// GetDeviceNameFromMount finds the device name by checking the mount path
	// to get the global mount path within its plugin directory.

}

// DeviceOpened determines if the device is in use elsewhere
func (hu *HostUtil) DeviceOpened(pathname string) (bool, error) {
	return false, nil
}

// PathIsDevice determines if a path is a device.
func (hu *HostUtil) PathIsDevice(pathname string) (bool, error) {
	return false, nil
}

// MakeRShared checks that given path is on a mount with 'rshared' mount
// propagation. Empty implementation here.

// Otherwise, return false with error
func (hu *HostUtil) DeviceOpened(pathname string) (bool, error) {
	return ExclusiveOpenFailsOnDevice(pathname)
}

// PathIsDevice uses FileInfo returned from os.Stat to check if path refers
// to a device.
func (hu *HostUtil) PathIsDevice(pathname string) (bool, error) {
	pathType, err := hu.GetFileType(pathname)
	isDevice := pathType == FileTypeCharDev || pathType == FileTypeBlockDev
	return isDevice, err

			return volumetypes.NewOperationContext(eventErr, detailedErr, migrated)
		}
		// Before logging that UnmountDevice succeeded and moving on,
		// use hostutil.PathIsDevice to check if the path is a device,
		// if so use hostutil.DeviceOpened to check if the device is in use anywhere
		// else on the system. Retry if it returns true.