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I am not arguing that the docker image output is mutably changing. It is a good artifact that can be reproducibly run. The comment I am originally replying to

I am not arguing that the docker image output is mutably changing. It is a good artifact that can be reproducibly run. The comment I am originally replying to is 'docker image definitions are idempotent'. Note, 'image definitions', not 'images'. My point has nothing to do with the image, but with the image definition itself.

johnmaguire2013 8y ago
Understood, just trying to point out there is still a flaw with the image (in that updates are actually important!) FWIW at my work, we don't use apt for installing packages. We compile the packages as a part of the Docker build. This generates mostly idempotent builds.