nixos/calibre-server: fix service argument escaping

  config,

  lib,

  pkgs,

  utils,

  ...

}:

let

  documentationLink = "https://manual.calibre-ebook.com";

  generatedDocumentationLink = documentationLink + "/generated/en/calibre-server.html";

  execFlags = (

    lib.concatStringsSep " " (

      lib.mapAttrsToList (k: v: "${k} ${toString v}") (

  execFlags =

    lib.mapAttrsToList (k: v: "--${k}=${toString v}") (

      lib.filterAttrs (name: value: value != null) {

          "--listen-on" = cfg.host;

          "--port" = cfg.port;

          "--auth-mode" = cfg.auth.mode;

          "--userdb" = cfg.auth.userDb;

        listen-on = cfg.host;

        port = cfg.port;

        auth-mode = cfg.auth.mode;

        userdb = cfg.auth.userDb;

      }

    )

      ++ [ (lib.optionalString (cfg.auth.enable == true) "--enable-auth") ]

      ++ cfg.extraFlags

    )

  );

    ++ lib.optional cfg.auth.enable "--enable-auth"

    ++ cfg.extraFlags;

in

{

      serviceConfig = {

        User = cfg.user;

        Restart = "always";

        ExecStart = "${cfg.package}/bin/calibre-server ${lib.concatStringsSep " " cfg.libraries} ${execFlags}";

        ExecStart = utils.escapeSystemdExecArgs (

          [ "${cfg.package}/bin/calibre-server" ] ++ execFlags ++ [ "--" ] ++ cfg.libraries

        );

      };

    };