Method mount

core/mount/mount_windows.go:38–109

Mount to the provided target.

(target string)

// Mount to the provided target.
func (m *Mount) mount(target string) (retErr error) {
	if m.Type != "windows-layer" {
		return fmt.Errorf("invalid windows mount type: '%s'", m.Type)
	}

	home, layerID := filepath.Split(m.Source)

	parentLayerPaths, err := m.GetParentPaths()
	if err != nil {
		return err
	}

	var di = hcsshim.DriverInfo{
		HomeDir: home,
	}

	if err := hcsshim.ActivateLayer(di, layerID); err != nil {
		return fmt.Errorf("failed to activate layer %s: %w", m.Source, err)
	}
	defer func() {
		if retErr != nil {
			if layerErr := hcsshim.DeactivateLayer(di, layerID); layerErr != nil {
				log.G(context.TODO()).WithError(layerErr).Error("failed to deactivate layer during mount failure cleanup")
			}
		}
	}()

	if err := hcsshim.PrepareLayer(di, layerID, parentLayerPaths); err != nil {
		return fmt.Errorf("failed to prepare layer %s: %w", m.Source, err)
	}

	defer func() {
		if retErr != nil {
			if layerErr := hcsshim.UnprepareLayer(di, layerID); layerErr != nil {
				log.G(context.TODO()).WithError(layerErr).Error("failed to unprepare layer during mount failure cleanup")
			}
		}
	}()

	volume, err := hcsshim.GetLayerMountPath(di, layerID)
	if err != nil {
		return fmt.Errorf("failed to get volume path for layer %s: %w", m.Source, err)
	}

	if len(parentLayerPaths) == 0 {
		// this is a base layer. It gets mounted without going through WCIFS. We need to mount the Files
		// folder, not the actual source, or the client may inadvertently remove metadata files.
		volume = filepath.Join(volume, "Files")
		if _, err := os.Stat(volume); err != nil {
			return fmt.Errorf("no Files folder in layer %s", layerID)
		}
	}
	if err := bindfilter.ApplyFileBinding(target, volume, m.ReadOnly()); err != nil {
		return fmt.Errorf("failed to set volume mount path for layer %s: %w", m.Source, err)
	}
	defer func() {
		if retErr != nil {
			if bindErr := bindfilter.RemoveFileBinding(target); bindErr != nil {