driver: add Close() method to Differ

Signed-off-by: Giuseppe Scrivano <[email protected]>

Author: giuseppe

drivers/driver.go

@@ -267,6 +267,7 @@ type DifferOptions struct {
 // This API is experimental and can be changed without bumping the major version number.
 type Differ interface {
 	ApplyDiff(dest string, options *archive.TarOptions, differOpts *DifferOptions) (DriverWithDifferOutput, error)
+	Close() error
 }
 
 // DriverWithDiffer is the interface for direct diff access.

pkg/chunked/storage_linux.go

@@ -193,6 +193,10 @@ func (c *chunkedDiffer) convertTarToZstdChunked(destDirectory string, payload *o
 	return copied, newSeekableFile(f), convertedOutputDigester.Digest(), newAnnotations, nil
 }
 
+func (c *chunkedDiffer) Close() error {
+	return nil
+}
+
 // GetDiffer returns a differ than can be used with ApplyDiffWithDiffer.
 // If it returns an error that matches ErrFallbackToOrdinaryLayerDownload, the caller can
 // retry the operation with a different method.