ImageService.ReleaseLayer(): remove unused containerOS argument

This looks to be a leftover from LCOW.

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>

daemon/delete.go

@@ -116,7 +116,7 @@ func (daemon *Daemon) cleanupContainer(container *container.Container, forceRemo
 	// When container creation fails and `RWLayer` has not been created yet, we
 	// do not call `ReleaseRWLayer`
 	if container.RWLayer != nil {
-		err := daemon.imageService.ReleaseLayer(container.RWLayer, container.OS)
+		err := daemon.imageService.ReleaseLayer(container.RWLayer)
 		if err != nil {
 			err = errors.Wrapf(err, "container %s", container.ID)
 			container.SetRemovalError(err)

daemon/export.go

@@ -52,7 +52,7 @@ func (daemon *Daemon) containerExport(container *container.Container) (arch io.R
 	}
 	defer func() {
 		if err != nil {
-			daemon.imageService.ReleaseLayer(rwlayer, container.OS)
+			daemon.imageService.ReleaseLayer(rwlayer)
 		}
 	}()
 
@@ -73,7 +73,7 @@ func (daemon *Daemon) containerExport(container *container.Container) (arch io.R
 	arch = ioutils.NewReadCloserWrapper(archv, func() error {
 		err := archv.Close()
 		rwlayer.Unmount()
-		daemon.imageService.ReleaseLayer(rwlayer, container.OS)
+		daemon.imageService.ReleaseLayer(rwlayer)
 		return err
 	})
 	daemon.LogContainerEvent(container, "export")

daemon/images/service.go

@@ -187,7 +187,7 @@ func (i *ImageService) GraphDriverName() string {
 
 // ReleaseLayer releases a layer allowing it to be removed
 // called from delete.go Daemon.cleanupContainer(), and Daemon.containerExport()
-func (i *ImageService) ReleaseLayer(rwlayer layer.RWLayer, containerOS string) error {
+func (i *ImageService) ReleaseLayer(rwlayer layer.RWLayer) error {
 	metadata, err := i.layerStore.ReleaseRWLayer(rwlayer)
 	layer.LogReleaseMetadata(metadata)
 	if err != nil && !errors.Is(err, layer.ErrMountDoesNotExist) && !errors.Is(err, os.ErrNotExist) {