content: Add InfoReaderProvider

Create interface that combines both content.InfoProvider and
content.Provider in `content` package.

Signed-off-by: Paweł Gronowski <pawel.gronowski@docker.com>
(cherry picked from commit 8235665)
Signed-off-by: Paweł Gronowski <pawel.gronowski@docker.com>

content/content.go

@@ -108,6 +108,12 @@ type Status struct {
 // WalkFunc defines the callback for a blob walk.
 type WalkFunc func(Info) error
 
+// InfoReaderProvider provides both info and reader for the specific content.
+type InfoReaderProvider interface {
+	InfoProvider
+	Provider
+}
+
 // InfoProvider provides info for content inspection.
 type InfoProvider interface {
 	// Info will return metadata about content available in the content store.

images/archive/exporter.go

@@ -148,7 +148,7 @@ func WithSkipNonDistributableBlobs() ExportOpt {
 // The manifest itself is excluded only if it's not present locally.
 // This allows to export multi-platform images if not all platforms are present
 // while still persisting the multi-platform index.
-func WithSkipMissing(store ContentProvider) ExportOpt {
+func WithSkipMissing(store content.InfoReaderProvider) ExportOpt {
 	return func(ctx context.Context, o *exportOptions) error {
 		o.blobRecordOptions.childrenHandler = images.HandlerFunc(func(ctx context.Context, desc ocispec.Descriptor) (subdescs []ocispec.Descriptor, err error) {
 			children, err := images.Children(ctx, store, desc)
@@ -211,12 +211,6 @@ func copySourceLabels(ctx context.Context, infoProvider content.InfoProvider, de
 	return desc, nil
 }
 
-// ContentProvider provides both content and info about content
-type ContentProvider interface {
-	content.Provider
-	content.InfoProvider
-}
-
 // Export implements Exporter.
 func Export(ctx context.Context, store content.Provider, writer io.Writer, opts ...ExportOpt) error {
 	var eo exportOptions