Feature request: search packages at a specific nixpkgs git revision

[cloudyluna]

Hi! Thank you for maintaining this awesome tool :D.

Nixpkgs channels, particularly nixos-unstable, update very quickly, and package versions change often. While this is usually fine when tracking a channel directly (using --channel flag), it can make it harder to determine the exact package versions used in a Nix flakes project, where the nixpkgs revision is pinned in the flake.lock file.

With that said, I would like nh search to support searching packages at a specific nixpkgs git commit revision.

For example:

nh search packageName --git-rev "2119f4ff47dfa4073288f8d8187a3ae3006eeb32"

This would allow users to easily look up which package versions correspond to the pinned nixpkgs revision used by their flake, without manually checking the nixpkgs repository or evaluating Nix expressions manually.

I think this could significantly improve the workflow for users who rely on flakes and pinned nixpkgs revisions.

Thanks!

[NotAShelf]

I'm not sure if this is possible with the current search backend. Nevertheless I'll investigate and try to figure out if it's possible.

[faukah]

This is most likely not possible.
nh search uses the same Elasticsearch instance as search.nixos.org, and after asking on Matrix and looking around a bit I found no indication of this being possible.
Another thing that makes me believe so is that it would be insanely expensive because you would have to effectively maintain a package index for every git revision.