{
  description = "Application packaged using poetry2nix";

  inputs = {
    flake-utils.url = "github:numtide/flake-utils";
    nixpkgs.url = "github:NixOS/nixpkgs/nixos-23.11";
    poetry2nix = {
      url = "github:nix-community/poetry2nix";
      inputs.nixpkgs.follows = "nixpkgs";
    };
    mnotify = {
      url = "git+file:../tasting/mnotify";
      inputs.nixpkgs.follows = "nixpkgs";
    };
  };

  outputs = { self, nixpkgs, flake-utils, poetry2nix, mnotify }:
    flake-utils.lib.eachDefaultSystem (system:
      let
        # see https://github.com/nix-community/poetry2nix/tree/master#api for more functions and examples.
        pkgs = nixpkgs.legacyPackages.${system};
        inherit (poetry2nix.lib.mkPoetry2Nix { inherit pkgs; }) mkPoetryApplication cleanPythonSources;
      in
      {
        packages = rec {
          myapp = mkPoetryApplication { projectDir = self; };
          default = self.packages.${system}.myapp;
          env = default.dependencyEnv;

          docker = pkgs.dockerTools.buildImage {
            name = "sms2matrix";
            tag = "latest";
            copyToRoot = pkgs.buildEnv {
              name = "image-root";
              paths = [
                default.dependencyEnv
                mnotify.packages.${system}.default
                pkgs.dockerTools.fakeNss # for mnotify
                pkgs.cacert
                (pkgs.lib.fileset.toSource
                  {
                    root = ./.;
                    fileset = pkgs.lib.fileset.fromSource (cleanPythonSources {
                      src = ./app;
                    });
                  })
              ];
              pathsToLink = [ "/bin" "/app" "/etc" ];
            };


            config = {
              Cmd = [ "/bin/uvicorn" "app.main:app" "--host" "0.0.0.0" ]; #"/bin/python" ];
              WorkingDir = "/app";
              Volumes = { "/app" = { }; };
            };
          };
        };

        devShells.default = pkgs.mkShell
          {
            inputsFrom = [ self.packages.${system}.myapp ];
            packages = [ pkgs.poetry ];
          };
      });
}