Copy copies data with the expected digest from the reader into the provided content store writer.

ReadBlob retrieves the entire contents of the blob from the provider.

WriteBlob writes data with the expected digest into the content store.

TODO(stevvooe): Consider a very different name for this struct.

IngestManager provides methods for managing ingests.

Manager provides methods for inspecting, listing and removing content.

Store combines the methods of content-oriented interfaces into a set that are commonly provided by complete implementations.

WalkFunc defines the callback for a blob walk.