Installing simple ruby gem via nix

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That’s basically what bundlerApp is for.

You start with the default.nix and Gemfile:

default.nix 
with import <nixpkgs> {};
bundlerApp {
  pname = "twurl";
  exes = ["twurl"];
  gemdir = ./.;
}
Gemfile 
source 'https://rubygems.org' do
  gem 'twurl'
end

After running bundix -l, you should then have these files in the directory:

Gemfile.lock 
GEM
  remote: https://rubygems.org/
  specs:
    oauth (0.5.4)
    twurl (0.9.3)
      oauth (~> 0.4)

PLATFORMS
  ruby

DEPENDENCIES
  twurl!

BUNDLED WITH
   1.16.3
gemset.nix 
{
  oauth = {
    source = {
      remotes = ["https://rubygems.org"];
      sha256 = "1zszdg8q1b135z7l7crjj234k4j0m347hywp5kj6zsq7q78pw09y";
      type = "gem";
    };
    version = "0.5.4";
  };
  twurl = {
    dependencies = ["oauth"];
    source = {
      remotes = ["https://rubygems.org"];
      sha256 = "10lcdakbgvbwcij8ngxm7vws7b40l004ma4mza9idi54vkxqzaws";
      type = "gem";
    };
    version = "0.9.3";
  };
}

Finally a nix build gives you the result/bin/twurl executable.

The difference is that bundlerEnv is for development with these gems, while bundlerApp simply gives you the executables without need for development dependencies, environment changes, nix-shell, etc…

Hope this helps :smile:

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