nixos/k3s: make assertions about missing configuration options warnings (#364370)

      ++ (lib.optional (cfg.role != "server" && cfg.charts != { })

        "k3s: Helm charts are only made available to the cluster on server nodes (role == server), they will be ignored by this node."

      )

      ++ (lib.optional (cfg.disableAgent && cfg.images != [ ])

        "k3s: Images are only imported on nodes with an enabled agent, they will be ignored by this node"

      ++ (lib.optional (

        cfg.disableAgent && cfg.images != [ ]

      ) "k3s: Images are only imported on nodes with an enabled agent, they will be ignored by this node")

      ++ (lib.optional (

        cfg.role == "agent" && cfg.configPath == null && cfg.serverAddr == ""

      ) "k3s: ServerAddr or configPath (with 'server' key) should be set if role is 'agent'")

      ++ (lib.optional

        (cfg.role == "agent" && cfg.configPath == null && cfg.tokenFile == null && cfg.token == "")

        "k3s: Token or tokenFile or configPath (with 'token' or 'token-file' keys) should be set if role is 'agent'"

      );

    assertions = [

      {

        assertion = cfg.role == "agent" -> (cfg.configPath != null || cfg.serverAddr != "");

        message = "serverAddr or configPath (with 'server' key) should be set if role is 'agent'";

      }

      {

        assertion =

          cfg.role == "agent" -> cfg.configPath != null || cfg.tokenFile != null || cfg.token != "";

        message = "token or tokenFile or configPath (with 'token' or 'token-file' keys) should be set if role is 'agent'";

      }

      {

        assertion = cfg.role == "agent" -> !cfg.disableAgent;

        message = "disableAgent must be false if role is 'agent'";

        message = "k3s: disableAgent must be false if role is 'agent'";

      }

      {

        assertion = cfg.role == "agent" -> !cfg.clusterInit;

        message = "clusterInit must be false if role is 'agent'";

        message = "k3s: clusterInit must be false if role is 'agent'";

      }

    ];