This enables docker cp and ADD/COPY docker build support for LCOW.
Originally, the graphdriver.Get() interface returned a local path
to the container root filesystem. This does not work for LCOW, so
the Get() method now returns an interface that LCOW implements to
support copying to and from the container.
Signed-off-by: Akash Gupta <akagup@microsoft.com>
Upstream-commit: 7a7357dae1bcccb17e9b2d4c7c8f5c025fce56ca
Component: engine
Also exposes shared cache and garbage collection/prune
for the source data.
Signed-off-by: Tonis Tiigi <tonistiigi@gmail.com>
Upstream-commit: 5c3d2d552b0430672d5f481ab2d37036f6e92166
Component: engine
