JRuby withPackages support

fzakaria · August 30, 2020, 8:40pm

Is there any limitation I should know about whether JRuby could / should support withPackages ?

According to https://github.com/NixOS/nixpkgs/blob/cf2314ff9a73bfa5c4df814418185ee7fb274067/doc/languages-frameworks/ruby.section.md you can write similar nix expressions for CRuby

with import <nixpkgs> {};
ruby.withPackages (ps: with ps; [ nokogiri pry ])

Looking at the source it seems to be minimally based around buildEnv

github.com

NixOS/nixpkgs/blob/cf2314ff9a73bfa5c4df814418185ee7fb274067/pkgs/development/ruby-modules/with-packages/default.nix

{ stdenv, lib, buildEnv, buildRubyGem, ruby, gemConfig, makeWrapper }:

/*
Example usage:
nix-shell -E "(import <nixpkgs> {}).ruby.withPackages (pkgs: with pkgs; [ pry nokogiri ])"

You can also use this for writing ruby scripts that run anywhere that has nix
using a nix-shell shebang:
  #!/usr/bin/env nix-shell
  #!nix-shell -i ruby -p "ruby.withPackages (pkgs: with pkgs; [ pry nokogiri ])"


Run the following in the nixpkgs root directory to update the ruby-packages.nix:
./maintainers/scripts/update-ruby-packages
*/

let
  functions = import ../bundled-common/functions.nix { inherit lib gemConfig; };

  buildGems = gemset:

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(Relevant snippet)

  withPackages = selector:
    let
      selected = selector gems;

      gemEnv = buildEnv {
        name = "ruby-gems";
        paths = selected;
        pathsToLink = [ "/lib" "/bin" "/nix-support" ];
      };

      wrappedRuby = stdenv.mkDerivation {
        name = "wrapped-${ruby.name}";
        nativeBuildInputs = [ makeWrapper ];
        buildCommand = ''
          mkdir -p $out/bin
          for i in ${ruby}/bin/*; do
            makeWrapper "$i" $out/bin/$(basename "$i") --set GEM_PATH ${gemEnv}/${ruby.gemPath}
          done
        '';
      };

I’m trying to grok through the source to understand how I can make the contribution; but I don’t really understand the passthru attrset.

Another interesting problem; is that the top-level Ruby packages (that contains all the gems); don’t contain any platform information to restrict whether they include C-extensions or Java.

Appreciate any feedback here.

CC @manveru

fzakaria · August 30, 2020, 9:06pm

Quick follow-up why I’m interested in this; although I’m not using bundix; I’d like to hydrate my development environment (nix-shell) with Bundler & Rake at the very least.