[amarshall]

> NixOS uses "reproducible" to mean "with the same Nix code, you get the same program behaviour".

Note that ”Nix code” also includes the hashes of all non-Nix sources. One way to think of it is that Nix has reliable build cache invalidation.

> This is more/less what people hope Dockerfiles provide.

Indeed, but importantly they do not provide input-reproducibility (while Nix does) because, at least, there are no hashes for remote data.

[__MatrixMan__]

PSA: you can build OCI images with nix, then they'll be a pure function of their input like we've all wished was the case with Dockerfiles.

[Smaug123]

(And Nix derivations compose, whereas Dockerfiles entirely do not.)