> 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

> 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.