Using AWS CLI, and jq if needed, I'm trying to get the tag of the newest image in a particular repo.
Let's call the repo foo, and say the latest image is tagged bar. What query do I use to return bar?
I got as far as
aws ecr list-images --repository-name foo
and then realized that the list-images documentation gives no reference to the date as a queryable field. Sticking the above in a terminal gives me keypairs with just the tag and digest, no date.
Is there still some way to get the "latest" image? Can I assume it'll always be the first, or the last in the returned output?
You can use describe-images instead.
aws ecr describe-images --repository-name foo
returns imagePushedAt which is a timestamp property which you can use to filter.
I dont have examples in my account to test with but something like following should work
aws ecr describe-images --repository-name foo \
--query 'sort_by(imageDetails,& imagePushedAt)[*]'
If you want another flavor of using sort method, you can review this post
To add to Frederic's answer, if you want the latest, you can use [-1]:
aws ecr describe-images --repository-name foo \
--query 'sort_by(imageDetails,& imagePushedAt)[-1].imageTags[0]'
Assuming you are using a singular tag on your images... otherwise you might need to use imageTags[*] and do a little more work to grab the tag you want.
To get only latest image with out special character minor addition required for above answer.
aws ecr describe-images --repository-name foo --query 'sort_by(imageDetails,& imagePushedAt)[-1].imageTags[0]' --output text
Without having to sort the results, you can filter them specifying the imageTag=latest on image-ids, like so:
aws ecr describe-images --repository-name foo --image-ids imageTag=latest --output text
This will return only one result with the newest image, which is the one tagged as latest
