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api/services/content: define the content service

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Bring the content service into the containerd API. This allows the
content store to be coordinated in the containerd daemon with minimal
effort. For the most part, this API follows the conventions and behavior
of the existing content store implementation with a few caveats.
Specifically, we remove the object oriented transaction mechanism in
favor of a very rich `Write` call.

Pains are taken to reduce race conditions around when having multiple
writers to a single piece of content. Clients should be able to race
towards getting a write lock on a reference, then wait on each other.

For the most part, this should be generically pluggable to allow
implementations of the content store to be swapped out.

We'll follow this up with an implementation to validate the model.

Signed-off-by: Stephen J Day <stephen.day@docker.com>
This commit is contained in:
Stephen J Day 2017-02-13 18:44:01 -08:00
parent 4cb31d9615
commit baaf7543dc
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