{
  description = "Application packaged using poetry2nix";

  inputs.flake-utils.url = "github:numtide/flake-utils";
  inputs.nixpkgs.url = "github:NixOS/nixpkgs/release-22.11";
  inputs.poetry2nix = {
    url = "github:nix-community/poetry2nix";
    inputs.nixpkgs.follows = "nixpkgs";
  };

  outputs = { self, nixpkgs, flake-utils, poetry2nix }:
    flake-utils.lib.eachDefaultSystem (system:
      let
        # see https://github.com/nix-community/poetry2nix/tree/master#api for more functions and examples.
        inherit (poetry2nix.legacyPackages.${system}) mkPoetryApplication mkPoetryEnv;
        pkgs = nixpkgs.legacyPackages.${system};
      in rec {

        hydraJobs = pkgs.lib.optionalAttrs
          (system == "x86_64-linux" ) {
            handyhelper = packages.handyhelper;
            runCommandHook = {

              handyhelper = pkgs.runCommand "Handy Helper Deploy" {
                nativeBuildInputs = [
                  packages.handyhelper
                ];
              } ''
                cat << 'DOC' >> $out
#!${pkgs.runtimeShell}
export tmp=$(mktemp -d)
pushd $tmp
${pkgs.wget}/bin/wget \
  https://git.syzygial.cc/Syzygial/HandyHelper/archive/${self.rev}.bundle
git clone * src
${pkgs.tree}/bin/tree
cd src
${pkgs.sops}/bin/sops -i -d secrets/deploy.nix
${pkgs.sops}/bin/sops -i -d secrets/deploy.sh
export flake="$tmp/src/deploy"
${pkgs.runtimeShell} ./secrets/deploy.sh
DOC
                chmod +x $out
              '';
            };
          };
        packages = {
          handyhelper = mkPoetryApplication { projectDir = self; };
          default = self.packages.${system}.myapp;
        };

        devShells.default = pkgs.mkShell {
          packages = with pkgs; [
            poetry2nix.packages.${system}.poetry
            (mkPoetryEnv {
              projectDir = self;
            })
            sops
          ];
        };
      }
    );
}