UPSTREAM: 33014: Kubelet: Use RepoDigest for ImageID when available #11674
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Previously, we used the docker config digest (also called "image ID"
by Docker) for the value of the
ImageID
field in the container status.This was not particularly useful, since the config manifest is not
what's used to identify the image in a registry, which uses the manifest
digest instead. Docker 1.12+ always populates the RepoDigests field
with the manifest digests, and Docker 1.10 and 1.11 populate it when
images are pulled by digest.
This commit changes
ImageID
to point to the the manifest digest whenavailable, using the prefix
docker-pullable://
(instead ofdocker://
)