Nix Flake Template for Elixir?

I apologize in advance if I am posting this in the wrong place.

I see a nix package for Elixir (in fact I see several). Big kudos to those folks who have taken the time to do this!

I want to create a nix flake for an Elixir app I’m working on and I can create a plain old nix flake but I was wondering if someone has already created a nix flake template for Elixir? Googling hasn’t turned up anything (although I may be using the wrong search terms).

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Thank you! That’s a big help!

I maintain some OSS Nix<->BEAM tooling, which offers flake init templates, support for ingesting asdf .tool-versions files, reusable dev shells and a few other niceties, based on flake-parts lib. Repo is here and feedback or critiques are welcome. Example usage is also documented here.

I’ve been iterating and daily driving it for a couple years at this point, and haven’t had asdf/mise/rtx installed at all in the last 18 months or so.


Hey, Very happy to see that you like Nix.

After the post mentioned by @zimt28, my workflow improved a lot. If you continue to use Nix, I believe you will encounter some issues, like:

  1. How to init a project quickly?
  2. How to package an Elixir app as a Nix derivation?
  3. How to package an Elixir app as a Docker image with Nix?

I really like building Docker image with Nix Flake - I don’t have to sync .dockerignore with .gitignore anymore.

All above problems already have solutions, I hope the following links are also useful to you in the future.

  1. using Nix template: You can create your own nix-dev-template by following the-nix-way/dev-templates or c4710n/nix-dev-templates, etc.
  2. Check out nix-dev-templates/elixir/phoenix/nix/release.nix at 8c8ed3b805c043e2666124fa2b4e22067ca1d0df · c4710n/nix-dev-templates · GitHub.
  3. Check out nix-dev-templates/elixir/phoenix/flake.nix at 8c8ed3b805c043e2666124fa2b4e22067ca1d0df · c4710n/nix-dev-templates · GitHub
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Thank you so much for the pointers Shane! I’m sure that will help me to progress with employing Nix with Elixir!

Thank you so much for providing those links!

Hi again Shane,

Just curious–do you ever use your nix stuff in order to build docker images? That’s one of the use cases I definitely wanted to try.

I use it and enjoy doing so for non-BEAM work, it works pretty well for Rust and Golang binaries, but the output for Elixir was somewhat inferior to a naive Dockerfile as of a year or two ago. The closure size was even larger than a normal Debian based image, but I never bothered to triage why or file issues or PRs to nixpkgs about it. Part of it was that it considered systemd(!) a propagated input.

If I wanted to make it work today I’d use the erlang_nox or erlang_minimal package set to omit wx stuff, and the recently file set support to make sure I didn’t get extra blobs from the source tree or spurious rebuilds.

Thanks Shane! I appreciate your insights on this!