Nixos-unstable’s iso_minimal.x86_64-linux is 100% reproducible!

We’ve been hovering close to 100% for a while now but, with the staging-next merge a few days ago, it’s finally happened: https://r13y.com/ (https://web.archive.org/web/20210620180034/https://r13y.com/)

If I’ve done everything correctly, the 21.05 ISO also passes the check on my machine, hoorray!

Feel free to verify everything yourself; getting @grahamc’s r13y script running is trivial (I’d recommend running it inside a Docker container, though remember to enable sandboxing!)

Next goal: 100% reproducible GNOME ISO :wink:

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Here is some general information what this is about and why it matters: https://reproducible-builds.org/

Here are comments to this announcement: Nixos-unstable’s ISO_minimal.x86_64-Linux is 100% reproducible | Hacker News

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Incredible work from the community, especially @raboof who consistently kept pushing for the finishing line.

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@tomberek shared their result of the GNOME ISO in the r13y matrix channel: Is NixOS Reproducible?

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For a while now the ISO is no longer 100% reproducible, anyone have a clue what happened?

1434 out of 1501 (95.54%) paths in the minimal installation image are reproducible!

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The paths are “unchecked”, not “unreproducible” - which means they might in fact be reproducible, but https://www.r13y.com was unable to verify this. This could have any number of reasons, including things like timeouts or exhausted memory or disk space.

For example, manually checking nix-build /nix/store/310735bj7rnfhy1vyrddalz2cfa9f4kl-gzip-1.10.tar.xz.drv --check suggests that derivation is actually fine AFAICS.

To dig deeper perhaps you could have a look at Builds · r13y.com

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