Image digest result is <none> about acr-builder HOT 3 CLOSED

Yes, pushing before evaluating the digests would solve the issue

https://stackoverflow.com/questions/39811230/why-doesnt-my-newly-created-docker-have-a-digest

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So we found two problems

1. For output image, we need to push it first to get the digest.
2. For dependency image, the command like docker image ls --digest docker:17.12.0-ce-git is unable to get the image digest, only <none>. It's probably related to docker/cli#728.

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We found another issue.

For multi-arch docker images (eg, Ubuntu), docker inspect or docker image only returns the master digest for all platforms. Ideally, we want to provide platform-specific digest for dependency tracking.

For now, we will just provide the master digest. Once the toolchain is ready, we can switch to platform-specific digest.

cc @djyou

Edit

Open #57 to track the issue.

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