{
  description = "Integrates sops into nixos";
  inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
  inputs.nixpkgs-stable.url = "github:NixOS/nixpkgs/release-24.05";
  nixConfig.extra-substituters = [ "https://cache.thalheim.io" ];
  nixConfig.extra-trusted-public-keys = [
    "cache.thalheim.io-1:R7msbosLEZKrxk/lKxf9BTjOOH7Ax3H0Qj0/6wiHOgc="
  ];
  outputs =
    {
      self,
      nixpkgs,
      nixpkgs-stable,
    }:
    let
      systems = [
        "x86_64-linux"
        "x86_64-darwin"
        "aarch64-darwin"
        "aarch64-linux"
      ];
      forAllSystems = f: nixpkgs.lib.genAttrs systems (system: f system);
      suffix-version =
        version: attrs:
        nixpkgs.lib.mapAttrs' (name: value: nixpkgs.lib.nameValuePair (name + version) value) attrs;
      suffix-stable = suffix-version "-24_05";
    in
    {
      overlays.default =
        final: prev:
        let
          localPkgs = import ./default.nix { pkgs = final; };
        in
        {
          inherit (localPkgs)
            sops-install-secrets
            sops-init-gpg-key
            sops-pgp-hook
            sops-import-keys-hook
            sops-ssh-to-age
            ;
          # backward compatibility
          inherit (prev) ssh-to-pgp;
        };
      nixosModules = {
        sops = ./modules/sops;
        default = self.nixosModules.sops;
      };
      homeManagerModules.sops = ./modules/home-manager/sops.nix;
      homeManagerModule = self.homeManagerModules.sops;
      darwinModules = {
        sops = ./modules/nix-darwin;
        default = self.darwinModules.sops;
      };
      packages = forAllSystems (
        system:
        import ./default.nix {
          pkgs = import nixpkgs { inherit system; };
        }
      );
      checks =
        nixpkgs.lib.genAttrs
          [
            "x86_64-linux"
            "aarch64-linux"
          ]
          (
            system:
            let
              tests = self.packages.${system}.sops-install-secrets.tests;
              packages-stable = import ./default.nix {
                pkgs = import nixpkgs-stable { inherit system; };
              };
              tests-stable = packages-stable.sops-install-secrets.tests;
            in
            tests // (suffix-stable tests-stable) // (suffix-stable packages-stable)
          );

      devShells = forAllSystems (
        system:
        let
          pkgs = nixpkgs.legacyPackages.${system};
        in
        {
          unit-tests = pkgs.callPackage ./pkgs/unit-tests.nix { };
          default = pkgs.callPackage ./shell.nix { };
        }
      );
    };
}