Image Labels

[psavery]

Hi there,

I was wondering if shifter images store labels from their corresponding docker images, and if there is a way to look the labels up? For docker and singularity, we are storing important metadata about the images in the labels, and we'd like to do the same with shifter if possible.

For instance, take this Dockerfile (from psavery/test:latest):

FROM ubuntu:20.04
  
LABEL label=3 \
  nested.label=True

We can inspect the labels with docker like so:

docker inspect --format='{{json .Config.Labels}}' psavery/test:latest
# {"label":"3","nested.label":"True"}

Or similarly in singularity, if the labels are defined in the .def file:

singularity inspect test.simg 
# label: 3
# nested.label: True

If labels are not available in shifter, could they be added?

[scanon]

Currently no. Is the main use case similar to what you show before? Just being able to inspect a specific image and get the labels? You don't, for example, need to query based on these do you?

[psavery]

@scanon That is correct, we just need to inspect a specific image and get the labels. We don't need to query based on them.

[scanon]

I think this could be added without too much trouble. I'm going to turn this into a feature request.

[psavery]

@scanon Any updates on when this might be implemented?

[scanon]

Let me see if I could do a quick version.