How to set nixpkgs.config options in devenv.yaml or devenv.nix?

[trembel]

Question: How to set nixpkgs.config options in devenv.yaml?

Description

For a project I need nrfutil, which itself depends on segger-jlink. This is a non-free package (which I can set using permittedUnfreePackages, however it further requires to set nixpkgs.config.segger-jlink.acceptLicense = true, but I'm not sure how to configure these options in devenv.yaml format.

Current Configuration

My devenv.yaml:

nixpkgs:
  permittedUnfreePackages:
    - nrfutil
    - segger-jlink
inputs:
  nixpkgs:
    url: github:cachix/devenv-nixpkgs/rolling
  rust-overlay:
    url: github:oxalica/rust-overlay
    inputs:
      nixpkgs:
        follows: nixpkgs

Error Message

error:
error: Use of the "SEGGER JLink Software and Documentation pack" requires the
acceptance of the following licenses:

  - SEGGER Downloads Terms of Use [1]
  - SEGGER Software Licensing [2]

You can express acceptance by setting acceptLicense to true in your
configuration. Note that this is not a free license so it requires allowing
unfree licenses as well.

configuration.nix:
  nixpkgs.config.allowUnfree = true;
  nixpkgs.config.segger-jlink.acceptLicense = true;

config.nix:
  allowUnfree = true;
  segger-jlink.acceptLicense = true;

[1]: https://www.segger.com/downloads/jlink/JLink_Linux_V874_x86_64.tgz
[2]: https://www.segger.com/purchase/licensing/

✖ Building shell in 3.01s

Question

How can I set arbitrary nixpkgs.config options (like segger-jlink.acceptLicense = true) in devenv.yaml? The error message provides examples for traditional NixOS configuration files, but I need to know the equivalent syntax for devenv's YAML/nix-based configuration.

Is there a general way to pass through nixpkgs config options in devenv.yaml, or do I need to use a different approach?

[domenkozar]

There isn't really a way to do that, but I find this is more of an api issue that permittedUnfreePackages should be renamed to something like accepting the license.

[trembel]

hmm, thanks.. do you have an idea for a workaround (as I'm both new to nix and devenv)?

[Vaider7]

@trembel

I also needed to accept the license (microsoftVisualStudioLicenseAccepted), so I solve it this way:

devenv.yaml

inputs:
  nixpkgs:
    url: github:cachix/devenv-nixpkgs/rolling
allowUnfree: true

devenv.nix

{ pkgs, lib, ... }@inputs:
let
  pkgs = import inputs.nixpkgs {
    system = inputs.pkgs.stdenv.system;
    config.microsoftVisualStudioLicenseAccepted = true;
    config.allowUnfree = true;
  };
in {
# ...
}

Then you can use pkgs as usual. Probably it's not the best solution, but at least it works

I think the ability to set arbitrary nixpkgs.config options would be very useful