{
	description = "Application packaged using poetry2nix";

	inputs.flake-utils.url = "github:numtide/flake-utils";
	inputs.nixpkgs.url = "github:NixOS/nixpkgs";
	inputs.poetry2nixSrc = {
		url = "github:nix-community/poetry2nix";
		inputs.nixpkgs.follows = "nixpkgs";
	};

	outputs = { self, nixpkgs, flake-utils, poetry2nixSrc }:
	flake-utils.lib.eachDefaultSystem (system:
	let
		pkgs = nixpkgs.legacyPackages.${system};
		poetry2nix = poetry2nixSrc.lib.mkPoetry2Nix { inherit pkgs; };
		kalpaaApp = poetry2nix.mkPoetryApplication {
			projectDir = self;
			python = pkgs.python39;
			preferWheels = true;
		};
		kalpaaEnv = poetry2nix.mkPoetryEnv {
			projectDir = self;
			python = pkgs.python39;
			preferWheels = true;
			overrides = poetry2nix.overrides.withDefaults (self: super: {
			});
		};
		kalpaa-docker-image = pkgs.dockerTools.buildLayeredImage {
			name = "kalpaa";
			tag = "latest";


			contents = [

				# some stuff that dockertools provides?
				# pkgs.dockerTools.usrBinEnv
				# pkgs.dockerTools.binSh
				# pkgs.dockerTools.caCertificates
				# pkgs.dockerTools.fakeNss

				pkgs.bash
				pkgs.coreutils
				# pkgs.cacert
				# pkgs.gnutar
				# pkgs.gzip
				# pkgs.gnused
				# pkgs.gnugrep
				pkgs.uv
				kalpaaApp

			];

			config = {
				Cmd = [ "/bin/bash" ];
				Env = [
					"PATH=/bin"
				];
				WorkingDir = "/workspace";
			};
		};
	in {
		packages = {
			inherit kalpaaEnv;
			inherit kalpaaApp;
			inherit kalpaa-docker-image;
			default = self.packages.${system}.kalpaaEnv;
		};


		devShells.default = pkgs.mkShell {
			inputsFrom = [ self.packages.${system}.kalpaaEnv ];
			buildInputs = [
				pkgs.poetry
				self.packages.${system}.kalpaaEnv
				self.packages.${system}.kalpaaApp
				pkgs.just
				pkgs.nodejs
			];
			shellHook = ''
				export DO_NIX_CUSTOM=1
			'';
		};

	}
	);
}