ORAS Support for labels

[KevinDMack]

So we have a process by which our build process is building a artifact using oras, and it works great for building the artifact, but our end delivery requires that we have a label on the resulting artifact / image. Is there a way to do this when building before the push? Similar to how we would identify the label in the Dockerfile.

[qweeah]

Hey Kevin, thanks for initiating this discussion. I am not sure if you are trying to add annotations to the pushed manifest. If so, you can try below command:

Example - Push repository with manifest annotations
  oras push --annotation "key1=val1"  --annotation "key2=val2" localhost:5000/hello:latest hi.txt

It works similarly for attaching:

Example - Attach file 'hi.txt' and add manifest annotations
  oras attach --artifact-type doc/example --annotation "key=val" localhost:5000/hello:latest hi.txt

[rpardini]

Hmm, I found this looking for a way to put labels on the pushed artifacts.
As the OP said, I'd like to add labels to the "main" manifest (sorry for terminology), like LABEL would do in a Dockerfile.
ORAS cli does create a label already, but I can't find a way to change it or add others.

  "labels": {
    "org.opencontainers.image.created": "2023-02-03T14:37:58Z"
  }

[rpardini]

Scratch that. If I use "--annotation" "org.opencontainers.image.description=some description" it magically becomes a label! On 0.16.0 at least...