RISC-V/flake.nix at main · MIT-OpenCompute/RISC-V · GitHub

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{
  description = "A Nix-flake-based Scala development environment";

  inputs.nixpkgs.url = "https://flakehub.com/f/NixOS/nixpkgs/0.1"; # unstable Nixpkgs

  outputs =
    { self, ... }@inputs:

    let
      javaVersion = 23; # Change this value to update the whole stack

      supportedSystems = [
        "x86_64-linux"
        "aarch64-linux"
        "x86_64-darwin"
        "aarch64-darwin"
      ];
      forEachSupportedSystem =
        f:
        inputs.nixpkgs.lib.genAttrs supportedSystems (
          system:
          f {
            pkgs = import inputs.nixpkgs {
              inherit system;
              overlays = [ inputs.self.overlays.default ];
            };
          }
        );
    in
    {
      overlays.default =
        final: prev:
        let
          jdk = prev."jdk${toString javaVersion}";
        in
        {
          sbt = prev.sbt.override { jre = jdk; };
          scala = prev.scala_3.override { jre = jdk; };
          mill = prev.mill.override { jre = jdk; };
        };

      devShells = forEachSupportedSystem (
        { pkgs }:
        {
          default = pkgs.mkShellNoCC {
            packages = with pkgs; [
              scala
              sbt
              mill
              coursier
              verilator
              gcc
              gnumake
              python3
              jdk21
              which
            ];
          };
        }
      );
    };
}