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Layer store manages read-only and read-write layers on a union file system. Read only layers are always referenced by content addresses. Read-write layer identifiers are handled by the caller but upon registering its difference, the committed read-only layer will be referenced by content hash. Signed-off-by: Derek McGowan <derek@mcgstyle.net> (github: dmcgowan) Signed-off-by: Tonis Tiigi <tonistiigi@gmail.com>