Stream: show and tell

Topic: roc-overlay flake for nightly

view this post on Zulip blu (Jul 16 2026 at 19:04):

Hi all,

I made a roc-overlay inspired by zig-overlay to allow us to easily use the latest nightly roc binaries (or previous nightlies) directly as a one-off command, in an ad-hoc dev shell, in a flake, or as an overlay. I found this useful in this PR and hopefully this can allow repos/projects to test with the most up to date versions of the compiler while waiting for a stable release. Let me know if you like it or find any issues!

Run direct

nix run github:thebrandonlucas/roc-overlay --version

Make temp shell

nix shell github:thebrandonlucas/roc-overlay
roc --version

Run pinned release

nix shell 'github:thebrandonlucas/roc-overlay#nightly-2026-July-14-c9147c2'

In a flake:

{
  inputs = {
    nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
    roc-nightly.url = "github:thebrandonlucas/roc-overlay";
    roc-nightly.inputs.nixpkgs.follows = "nixpkgs";
  };

  outputs = {nixpkgs, roc-nightly, ...}: let
    system = "x86_64-linux";
    pkgs = nixpkgs.legacyPackages.${system};
  in {
    devShells.${system}.default = pkgs.mkShell {
      packages = [
        roc-nightly.packages.${system}.nightly
      ];
    };
  };
}

As an overlay:

{
  inputs = {
    nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
    roc-nightly.url = "github:thebrandonlucas/roc-overlay";
    roc-nightly.inputs.nixpkgs.follows = "nixpkgs";
  };

  outputs = {nixpkgs, roc-nightly, ...}: let
    system = "x86_64-linux";
    pkgs = import nixpkgs {
      inherit system;
      overlays = [roc-nightly.overlays.default];
    };
  in {
    devShells.${system}.default = pkgs.mkShell {
      packages = [
        pkgs.rocpkgs.nightly
      ];
    };
  };
}

view this post on Zulip Luke Boswell (Jul 17 2026 at 04:05):

@blu would you like to make a PR to add this to github.com/lukewilliamboswell/roc-awesome

I am happy to do that if its easier.

view this post on Zulip blu (Jul 17 2026 at 04:51):

@Luke Boswell Done! https://github.com/lukewilliamboswell/roc-awesome/pull/26/changes.

Last updated: Jul 23 2026 at 13:15 UTC