hermes - 💡(How to fix) Fix feat(nix): change extraPythonPackages from listOf package to functionTo

Problem or Use Case

extraPythonPackages (added in #15953) takes types.listOf types.package, for example:

services.hermes-agent.extraPythonPackages = [ pkgs.python312Packages.numpy ];

This forces users to know the exact Python version hermes was built with.

Proposed Solution

Conventional, when a option expect a list of non-top-level packages (like packages in python312Packages scope), the type of the option will be a function. Then it will be used like:

services.hermes-agent.extraPythonPackages = ps: [ ps.numpy ];

For example, the NixOS option "services.devpi-server.extraPackages" (https://github.com/NixOS/nixpkgs/blob/nixos-unstable/nixos/modules/services/misc/devpi-server.nix)

Alternatives Considered

No response

Feature Type

Other

Scope

Small (single file, < 50 lines)

Contribution

• I'd like to implement this myself and submit a PR

Debug Report (optional)