scanbuddy/flake.nix

{
  inputs = {
    nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
    pyproject-nix = {
      url = "github:nix-community/pyproject.nix";
      inputs.nixpkgs.follows = "nixpkgs";
    };
  };
  outputs = {
    self,
    nixpkgs,
    ...
  } @ inputs: let
    system = "x86_64-linux";
    pkgs = import nixpkgs {
      inherit system;
      config.allowUnfree = true;
    };
    python = pkgs.python3;
    serverProject = inputs.pyproject-nix.lib.project.loadPyproject {
      projectRoot = ./.;
    };

    # Packages
    script = pkgs.writeShellApplication {
      name = "scanbuddy";

      runtimeInputs = with pkgs; [sane-backends brscan5 ghostscript];

      text = builtins.readFile ./scanbuddy.sh;
    };

    # Returns an attribute set that can be passed to `buildPythonPackage`.
    attrs = serverProject.renderers.buildPythonPackage {inherit python;};
    server = python.pkgs.buildPythonPackage (attrs
      // {
        env.CUSTOM_ENVVAR = "foobar";
      });

    scanbuddy-pkg = pkgs.symlinkJoin {
      name = "scanbuddy";
      paths = [script server];
    };
  in {
    # devShells.${system}.default = pkgs.mkShell {
    #   packages = with pkgs; [
    #     python313
    #     python313Packages.flask
    #     python313Packages.waitress
    #   ];
    #
    #   shellHook = ''
    #     python --version
    #     exec zsh
    #   '';
    # };
    packages.${system} = {
      default = scanbuddy-pkg;
      inherit script;
      inherit server;
    };

    nixosModules.default = {
      config,
      pkgs,
      lib,
      ...
    }: {
      options = let
        inherit (lib) mkOption mkEnableOption types;
      in {
        services.scanbuddy = {
          enable = mkEnableOption "Enable the scanbuddy server";
          environment = mkOption {
            type = types.attrsOf (types.nullOr (types.oneOf [types.str types.path types.package]));
            default = {};
          };
        };
      };
      config = let
        cfg = config.services.scanbuddy;
      in {
        systemd.services.scanbuddy = lib.mkIf config.service.scanbuddy {
          description = "The scanbuddy webservice";
          wantedBy = ["multi-user.target"];
          serviceConfig = {
            ExecStart = "${scanbuddy-pkg}/bin/scanbuddy-server";
            Path = ["${scanbuddy-pkg}/bin"];
            WorkingDirectory = "/var/lib/scanbuddy";
            Type = "simple";
          };
          environment = cfg.environment;
        };
      };
    };
  };
}