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Has anyone explored reproducible docker image builds while using pants? I tracked down a bunch of remote-cache misses in our CI system stemming from the docker_image target producing a new digest every time


<https://github.com/pantsbuild/pants/issues/20699>

Ah, nice one! I've been meaning to get my work docker images to be reproducible but haven't quite got there yet.

I imagine one could use <https://www.pantsbuild.org/2.20/docs/using-pants/key-concepts/options#pantsbootstrap-file> to set `export CURRENT_COMMIT_DATE=$(...)` or `SOURCE_DATE_EPOCH` within Pants environment and then pass that down into the docker invocations via <https://www.pantsbuild.org/2.20/reference/subsystems/docker#env_vars>

I assume you're aware that using the commit date may make for images that change "unnecessarily" vs. using a fixed timestamp (e.g. build image X from commit A, do a commit B that doesn't touch any inputs to X, rebuild X =&gt; will change just because of the dates)

Yeah I'd prefer something more complex that used the dates of the transitive source files