[xyzzy_plugh]

It's not reproducible then, it's simply cached. It's a valid approach but there's tradeoffs of course.

[verdverm]

it's not an either or, it can be reproducible and cached

similarly, nix cannot guarantee reproducibility if the user does things to break that possibility

[xyzzy_plugh]

The difference is that you can blow the Nix cache away and reproduce it entirely. The same cannot be said for Docker.

[verdverm]

That's not true

Docker has a `--no-cache` flag, even easier than blowing it away, which you can also do with several built in commands or a rm -rf /var/lib/docker

Perhaps worth revisiting: https://docs.docker.com/build/cache/

[mkesper]

That will rebuild the cache from upstream but not reproducibly.