chore: apply linting

app.go

@@ -318,7 +318,8 @@ func (h *Headscale) expireEphemeralNodesWorker() {
 func (h *Headscale) grpcAuthenticationInterceptor(ctx context.Context,
 	req interface{},
 	info *grpc.UnaryServerInfo,
-	handler grpc.UnaryHandler) (interface{}, error) {
+	handler grpc.UnaryHandler,
+) (interface{}, error) {
 	// Check if the request is coming from the on-server client.
 	// This is not secure, but it is to maintain maintainability
 	// with the "legacy" database-based client

cmd/headscale/cli/utils.go

@@ -566,7 +566,7 @@ func GetFileMode(key string) fs.FileMode {
 	return fs.FileMode(mode)
 }
 
-func contains[T string](ts []T, t T) bool {
+func contains(ts []T, t T) bool {
 	for _, v := range ts {
 		if reflect.DeepEqual(v, t) {
 			return true

derp_server.go

@@ -128,7 +128,7 @@ func (h *Headscale) DERPHandler(ctx *gin.Context) {
 
 	if !fastStart {
 		pubKey := h.privateKey.Public()
-		pubKeyStr := pubKey.UntypedHexString() // nolint
+		pubKeyStr := pubKey.UntypedHexString()
 		fmt.Fprintf(conn, "HTTP/1.1 101 Switching Protocols\r\n"+
 			"Upgrade: DERP\r\n"+
 			"Connection: Upgrade\r\n"+

machine.go

@@ -363,8 +363,7 @@ func (h *Headscale) UpdateMachine(machine *Machine) error {
 // SetTags takes a Machine struct pointer and update the forced tags.
 func (h *Headscale) SetTags(machine *Machine, tags []string) error {
 	machine.ForcedTags = tags
-	err := h.UpdateACLRules()
+	if err := h.UpdateACLRules(); err != nil {
-	if err != nil {
 		return err
 	}
 	h.setLastStateChangeToNow(machine.Namespace.Name)
@@ -670,6 +669,7 @@ func getTags(
 		owners, err := expandTagOwners(aclPolicy, tag, stripEmailDomain)
 		if errors.Is(err, errInvalidTag) {
 			invalidTagMap[tag] = true
+
 			continue
 		}
 		var found bool

machine_test.go

@@ -387,13 +387,23 @@ func Test_getTags(t *testing.T) {
 			)
 			for _, valid := range gotValid {
 				if !contains(test.wantValid, valid) {
-					t.Errorf("valids: getTags() = %v, want %v", gotValid, test.wantValid)
+					t.Errorf(
+						"valids: getTags() = %v, want %v",
+						gotValid,
+						test.wantValid,
+					)
+
 					break
 				}
 			}
 			for _, invalid := range gotInvalid {
 				if !contains(test.wantInvalid, invalid) {
-					t.Errorf("invalids: getTags() = %v, want %v", gotInvalid, test.wantInvalid)
+					t.Errorf(
+						"invalids: getTags() = %v, want %v",
+						gotInvalid,
+						test.wantInvalid,
+					)
+
 					break
 				}
 			}

poll.go

@@ -619,7 +619,7 @@ func (h *Headscale) scheduledPollWorker(
 	}
 }
 
-func closeChanWithLog[C chan []byte | chan struct{}](channel C, machine, name string) {
+func closeChanWithLog(channel C, machine, name string) {
 	log.Trace().
 		Str("handler", "PollNetMap").
 		Str("machine", machine).