What is Nix equivalent of "guix challenge"?

Question

In Guix user can verify reproducibility of a package with guix challenge https://guix.gnu.org/manual/en/html_node/Invoking-guix-challenge.html.

What is the Nix command for that?

Answer 1

With nix-build you can use --check --keep-failed.

The minimal NixOS reproducibility is being tracked here: https://r13y.com/. You might look at the instructions there how to use it with diffoscope.