glue-pub/flake.nix at main · systemic-engineering/glue-pub · GitHub

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{
  description = "glue-pub — the garden runtime. systemic.engineering on fly.io.";

  inputs = {
    nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
    flake-utils.url = "github:numtide/flake-utils";
  };

  outputs = { self, nixpkgs, flake-utils }:
    flake-utils.lib.eachDefaultSystem (system:
      let
        pkgs = nixpkgs.legacyPackages.${system};
        beam = pkgs.beam.packages.erlang_27;
      in {
        devShells.default = pkgs.mkShell {
          buildInputs = [
            beam.erlang
            beam.elixir
            beam.rebar3
            pkgs.git
            pkgs.just
            pkgs.flyctl
          ] ++ pkgs.lib.optionals pkgs.stdenv.hostPlatform.isDarwin [
            pkgs.libiconv
          ];

          shellHook = ''
            export LANG=en_US.UTF-8

            # Isolate mix/hex builds in nix store to avoid cross-user permission issues
            export MIX_HOME="$PWD/.nix-mix"
            export HEX_HOME="$PWD/.nix-hex"
            export MIX_BUILD_PATH="$PWD/_build"
            export MIX_DEPS_PATH="$PWD/deps"
            export PATH="$MIX_HOME/bin:$HEX_HOME/bin:$PATH"

            # Ensure owned by current user
            mkdir -p "$MIX_HOME" "$HEX_HOME"

            mix local.hex --force --if-missing > /dev/null 2>&1
            mix local.rebar --force --if-missing > /dev/null 2>&1
          '';
        };
      });
}