tlaternet-webserver/flake.nix

{
  description = "tlater.net web server";

  inputs = {
    nixpkgs.url = "github:nixos/nixpkgs/nixos-20.09";
    flake-utils.url = "github:numtide/flake-utils";
    rust-overlay = {
      url = "github:oxalica/rust-overlay";
      inputs = {
        flake-utils.follows = "flake-utils";
        nixpkgs.follows = "nixpkgs";
      };
    };
    naersk = {
      url = "github:nmattia/naersk";
      inputs.nixpkgs.follows = "nixpkgs";
    };
  };

  outputs = { self, nixpkgs, flake-utils, rust-overlay, naersk }@inputs:
    flake-utils.lib.simpleFlake {
      inherit self nixpkgs;
      name = "tlaternet-webserver";
      preOverlays = [ rust-overlay.overlay ];

      overlay = final: prev: {
        tlaternet-webserver = let
          # The rust toolchain to use
          toolchain =
            prev.rust-bin.fromRustupToolchainFile ./rust-toolchain.toml;

          # The rust build lib, set to use the toolchain
          naersk-lib = naersk.lib.${prev.system}.override {
            cargo = toolchain;
            rustc = toolchain;
          };

          # pkg-config, needed to include many native libs
          nativeBuildInputs = [ prev.pkgconfig ];

          # Native libs
          buildInputs = [ prev.openssl ];

        in rec {
          # The packages provided by this flake
          packages = {
            webserver = prev.callPackage
              ({ rustPlatform, openssl, pkgconfig, ... }:
                naersk-lib.buildPackage {
                  inherit nativeBuildInputs buildInputs;

                  pname = "tlaternet-webserver";
                  root = ./.;
                }) { };
          };
          defaultPackage = packages.webserver;

          # A dev shell to hack manually; note this includes
          # additional toolchain components
          devShell = prev.mkShell {
            inherit buildInputs;
            nativeBuildInputs = nativeBuildInputs ++ [
              (toolchain.override {
                extensions =
                  [ "rust-src" "rust-analysis" "rust-analyzer-preview" ];
              })
            ];
          };
        };
      };
    };
}