Debugging nix build from flake [solved]

Is there a good way to debug the various phases (install, build, configure, etc.) while running nix build on a flake? I’ve been able to do things like run ls in those scripts to give me some information but would be super helpful if I could just initiate an interactive shell at that step - is this possible?


I haven’t tried it myself, but have you tried the --debugger flag?

If that doesn’t work, perhaps some of the recommendations in Debug a failed derivation with `breakpointHook` and `cntr` will.

Thank you Travis - that post is EXACTLY what I’ve been looking for. Incredibly helpful.

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