allow disabling mdns

.envrc

@@ -0,0 +1 @@
+use flake

.gitignore

@@ -1,3 +1,4 @@
 /target
 /result
+.direnv
 .env

flake.nix

@@ -34,7 +34,7 @@
 
       # `nix develop`
       devShell = pkgs.mkShell {
-        nativeBuildInputs = with pkgs; [rustc cargo];
+        nativeBuildInputs = with pkgs; [rustc cargo bacon];
       };
     })
     // {
@@ -71,6 +71,13 @@
               description = "enable docker integration";
             };
 
+            mdns = mkOption rec {
+              type = types.bool;
+              default = true;
+              example = true;
+              description = "enable mdns discovery";
+            };
+
             openPort = mkOption rec {
               type = types.bool;
               default = false;
@@ -103,6 +110,11 @@
             systemd.services."palantir" = {
               wantedBy = ["multi-user.target"];
               path = lib.optional cfg.zfs pkgs.zfs;
+              environment = {
+                PORT = "${toString cfg.port}";
+              } // (if (cfg.mdns == false) then {
+                DISABLE_MDNS = "true";
+              } else {});
 
               serviceConfig = let
                 pkg = self.defaultPackage.${pkgs.system};
@@ -110,7 +122,6 @@
                 Restart = "on-failure";
                 ExecStart = "${pkg}/bin/palantir";
                 User = "palantir";
-                Environment = "PORT=${toString cfg.port}";
                 PrivateTmp = true;
                 ProtectSystem = "full";
                 ProtectHome = true;

src/main.rs

@@ -64,6 +64,8 @@ async fn main() -> Result<()> {
         .transpose()?
         .unwrap_or(80);
 
+    let mdns = dotenv::var("DISABLE_MDNS").is_ok();
+
     ctrlc::set_handler(move || {
         std::process::exit(0);
     })
@@ -72,10 +74,12 @@ async fn main() -> Result<()> {
     let docker = get_docker().await;
     let docker = warp::any().map(move || docker.clone());
 
+    if !mdns {
         spawn(setup_mdns(
             hostname::get()?.into_string().unwrap(),
             host_port,
         ));
+    }
 
     let metrics = warp::path!("metrics").and(docker).and_then(serve_metrics);