NixOS modules: Difference between revisions

@@ Line 73: / Line 73: @@
 {
    # ...
+}
+</syntaxhighlight>
+== Example Module ==
+put into <code>hello.nix</code> in the same folder as your <code>configuration.nix</code>.
+<syntaxhighlight lang="nix">
+{ lib, pkgs, config, ... }:
+with lib;
+let
+  cfg = config.services.hello;
+in {
+  options.services.hello = {
+    enable = mkEnableOption "hello service";
+    greeter = mkOption {
+      type = types.string;
+      default = "world";
+    };
+  };
+  config = lib.mkIf cfg.enable {
+    systemd.services.hello = {
+      wantedBy = [ "multi-user.target" ];
+      serviceConfig.ExecStart = "${pkgs.hello}/bin/hello -g'Hello, ${escapeShellArg cfg.greeter}!'";
+    };
+  };
+}
+</syntaxhighlight>
+Add the following to your <code>configuration.nix</code>
+<syntaxhighlight lang=nix>
+{
+  imports = [ ./hello.nix ];
+  ...
+  services.hello = {
+    enable = true;
+    greeter = "Bob";
+  };
 }
 </syntaxhighlight>