nixpkgs/nixos/modules/services/networking/radicale.nix

{config, lib, pkgs, ...}:

with lib;

let

  cfg = config.services.radicale;

  confFile = pkgs.writeText "radicale.conf" cfg.config;

in

{

  options = {

    services.radicale.enable = mkOption {
      type = types.bool;
      default = false;
      description = ''
          Enable Radicale CalDAV and CardDAV server
      '';
    };

    services.radicale.config = mkOption {
      type = types.string;
      default = "";
      description = ''
        Radicale configuration, this will set the service
        configuration file
      '';
      };
  };

  config = mkIf cfg.enable {
    environment.systemPackages = [ pkgs.radicale ];

    users.extraUsers = singleton
      { name = "radicale";
        uid = config.ids.uids.radicale;
        description = "radicale user";
        home = "/var/lib/radicale";
        createHome = true;
      };

    users.extraGroups = singleton
      { name = "radicale";
        gid = config.ids.gids.radicale;
      };

    systemd.services.radicale = {
      description = "A Simple Calendar and Contact Server";
      after = [ "network.target" ];
      wantedBy = [ "multi-user.target" ];
      script = "${pkgs.radicale}/bin/radicale -C ${confFile} -f";
      serviceConfig.User = "radicale";
      serviceConfig.Group = "radicale";
    };
  };
}