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https://github.com/inscapist/ruby-nix

Generates reproducible ruby/bundler app environment with Nix
https://github.com/inscapist/ruby-nix

bundix nix nix-flake ruby ruby-nix

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Generates reproducible ruby/bundler app environment with Nix

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README 

        
# Ruby Nix



This is technically a fork of `bundlerEnv` that attempts to better meet the needs of ruby app developers instead of package maintainers.



This flake exports a function that is suitable for application development (eg. Rails).



## Tl;dr

The `gemset.nix` file, generated by executing the `bundix` command, manages your environment. Bundix depends on the contents of `Gemfile.lock`, which is produced by running the `bundle lock` command after modifying the `Gemfile`.



```

Gemfile --[bundle lock]-->

Gemfile.lock --[bundix]-->

gemset.nix --[nix develop (actual build)]-->

reproducible ruby environment

```



## Features



1. supports local, path-based gems

2. supports git sources

3. supports pre-compiled native gems on multiple platforms (see [this discussion](https://github.com/nix-community/bundix/pull/68))

4. bundix out of the box

5. A starter template based on flake



## How is it different from bundlerEnv?



1. it does not track the entire directory as `inputSrc` when `gemDir` is specified, requiring only `gemset.nix`.

2. it does not use `BUNDLE_GEMFILE` variable.

3. it works without `Gemfile` and `Gemfile.lock`.



## The gist



``` nix

      let

        pkgs = import nixpkgs {

          inherit system;

          overlays = [ ruby-nix.overlays.ruby ];

        };

        rubyNix = ruby-nix.lib pkgs;



        inherit (rubyNix {

          name = "simple-ruby-app";

          gemset = ./gemset.nix;

        })

          env ruby;

      in {

        devShells = rec {

          default = dev;

          dev = pkgs.mkShell { buildInputs = [ env ruby ]; };

        };

      });

```



## Global Bundix Installation (optional)



My bundix [fork](https://github.com/inscapist/bundix) is needed to generate the correct `gemset.nix`. It is available in nix shell out of the box. 



``` sh

# installation

nix profile install github:inscapist/bundix/main



# upgrade

nix profile upgrade '.*'

```



## Usage



With nix [installed](/docs/nix-installation.md) and optionally [direnv](/docs/direnv.md), you can run:



#### 1. Initialize flake



``` sh

cd myapp

nix flake init -t github:inscapist/ruby-nix/main

```



#### 2. Enter nix shell



If you are a [direnv](/docs/direnv.md) user, add the following content to `.envrc` and run `direnv allow`. Otherwise, run `nix develop -c zsh`.



```

if ! has nix_direnv_version || ! nix_direnv_version 3.0.4; then

    source_url "https://raw.githubusercontent.com/nix-community/nix-direnv/3.0.4/direnvrc" "sha256-DzlYZ33mWF/Gs8DDeyjr8mnVmQGx7ASYqA5WlxwvBG4="

fi



watch_file gemset.nix

use flake

```



Or use the latest version [here](https://github.com/nix-community/nix-direnv/blob/master/templates/flake/.envrc). Don't forget to add `watch_file /path_to/gemset.nix` to ensure direnv picks up gem changes.



#### 3. In nix shell



In a nix shell, you have `ruby`, `irb`, `bundle` at your disposal. Additional gems will only be available if they are specified in `gemset.nix`. To generate that, ensure `Gemfile` and `Gemfile.lock` are present, then run `bundix`. 



## FAQs



### 1. When does my environment gets build?

If you use direnv, running `git add gemset.nix` would trigger a rebuild automatically.



Otherwise, Ctrl-D to exit the current nix shell, and enter again.



### 2. How to `bundle`?



With ruby-nix, you shouldn't install gems using bundle. Nix will build the gems for you. **Always run `bundix` to update your gemset after making changes to Gemfile.lock.**. If you faced error with `git fetch`, set `BUNDLE_PATH=vendor/bundle` in your environment.



#### bundle add

run `bundle add GEM --skip-install` instead



#### bundle install (after modifying Gemfile)

run `bundle lock` instead



#### bundle update GEM

run `bundle lock --update=GEM` instead



#### Adding multiple platforms to Gemfile.lock



One example could be:



``` sh

bundle lock --update --add-platform ruby arm64-darwin-21 x86_64-darwin-20 x86_64-linux

```



You can retrieve the platform names by running `bundle platform`. Having multiple platforms would allow your colleagues to use precompiled gems, if they are available.



In your Gemfile.lock, it should show up as:

```

   sorbet-runtime (0.5.10626)

    sorbet-static (0.5.10626-universal-darwin-20)

    sorbet-static (0.5.10626-universal-darwin-21)

    sorbet-static (0.5.10626-universal-darwin-22)

    sorbet-static (0.5.10626-x86_64-linux)

    sorbet-static-and-runtime (0.5.10626)

      sorbet (= 0.5.10626)

@@ -1232,6 +1233,7 @@ GEM

PLATFORMS

  arm64-darwin-20

  arm64-darwin-21

  arm64-darwin-22

  x86_64-darwin-20

  x86_64-darwin-21

  x86_64-linux

```

### 3. `bundle lock` fails with `Permission denied` when Gemfile contains git sources



``` sh

export BUNDLE_PATH=vendor/bundle 

bundle lock

rm -rf vendor/bundle

```



also remove or rename `.bundle` if it continues to fail.



### 4. How to use a different ruby version?



Code comment of [simple-app](examples/simple-app/flake.nix) shows how to use ruby_3_1 instead of the

_current_ default version (2.7.6). You can also write your own overlay that overrides globally with your own ruby derivation.



## Common issues



#### I want to use a custom ruby version

Check the [sample](examples/simple-app/flake.nix). @bobvanderlinden maintains it at the [nixpkgs-ruby](https://github.com/bobvanderlinden/nixpkgs-ruby/tree/master) project.



#### Local bundle config overriding environment

Check your `.bundle/config` 



#### Ruby or gems don't come from nix

Check that you have removed `.rbenv` or `.rvm`



#### Bundle install doesn't work

Check the previous section. You should only use `bundler` to lock your dependencies, not install them.



#### I don't like that `nix develop` is a bash shell

Use `nix develop -c zsh` or even better install `.envrc`, following this guide.



## Roadmap



1. Try out more ruby versions, both old and new

2. Make bundix runs faster

3. More documentations



## Credits



All credits goes to the original authors of `buildRubyGem`, `bundlerEnv`, and `bundix` (@manveru, @lavoiesl, @jdelStrother). This is only a thin layer with a different take on top of these solid foundation. 



PRs welcomed :)