*: fix nakedret lint

Signed-off-by: Wei Fu <fuweid89@gmail.com>

client/pkg/transport/keepalive_listener.go

@@ -101,10 +101,10 @@ type tlsKeepaliveListener struct {
 
 // Accept waits for and returns the next incoming TLS connection.
 // The returned connection c is a *tls.Conn.
-func (l *tlsKeepaliveListener) Accept() (c net.Conn, err error) {
+func (l *tlsKeepaliveListener) Accept() (net.Conn, error) {
-	c, err = l.Listener.Accept()
+	c, err := l.Listener.Accept()
 	if err != nil {
-		return
+		return nil, err
 	}
 
 	c = tls.Server(c, l.config)

client/pkg/transport/listener.go

@@ -103,14 +103,17 @@ func newListener(addr, scheme string, opts ...ListenerOption) (net.Listener, err
 	return wrapTLS(scheme, lnOpts.tlsInfo, lnOpts.Listener)
 }
 
-func newKeepAliveListener(cfg *net.ListenConfig, addr string) (ln net.Listener, err error) {
+func newKeepAliveListener(cfg *net.ListenConfig, addr string) (net.Listener, error) {
+	var ln net.Listener
+	var err error
+
 	if cfg != nil {
 		ln, err = cfg.Listen(context.TODO(), "tcp", addr)
 	} else {
 		ln, err = net.Listen("tcp", addr)
 	}
 	if err != nil {
-		return
+		return nil, err
 	}
 
 	return NewKeepAliveListener(ln, "tcp", nil)
@@ -204,16 +207,18 @@ func (info TLSInfo) Empty() bool {
 	return info.CertFile == "" && info.KeyFile == ""
 }
 
-func SelfCert(lg *zap.Logger, dirpath string, hosts []string, selfSignedCertValidity uint, additionalUsages ...x509.ExtKeyUsage) (info TLSInfo, err error) {
+func SelfCert(lg *zap.Logger, dirpath string, hosts []string, selfSignedCertValidity uint, additionalUsages ...x509.ExtKeyUsage) (TLSInfo, error) {
 	verify.Assert(lg != nil, "nil log isn't allowed")
-	info.Logger = lg
+
+	var err error
+	info := TLSInfo{Logger: lg}
 	if selfSignedCertValidity == 0 {
 		err = errors.New("selfSignedCertValidity is invalid,it should be greater than 0")
 		info.Logger.Warn(
 			"cannot generate cert",
 			zap.Error(err),
 		)
-		return
+		return info, err
 	}
 	err = fileutil.TouchDirAll(lg, dirpath)
 	if err != nil {
@@ -223,16 +228,16 @@ func SelfCert(lg *zap.Logger, dirpath string, hosts []string, selfSignedCertVali
 				zap.Error(err),
 			)
 		}
-		return
+		return info, err
 	}
 
 	certPath, err := filepath.Abs(filepath.Join(dirpath, "cert.pem"))
 	if err != nil {
-		return
+		return info, err
 	}
 	keyPath, err := filepath.Abs(filepath.Join(dirpath, "key.pem"))
 	if err != nil {
-		return
+		return info, err
 	}
 	_, errcert := os.Stat(certPath)
 	_, errkey := os.Stat(keyPath)
@@ -242,7 +247,7 @@ func SelfCert(lg *zap.Logger, dirpath string, hosts []string, selfSignedCertVali
 		info.ClientCertFile = certPath
 		info.ClientKeyFile = keyPath
 		info.selfCert = true
-		return
+		return info, err
 	}
 
 	serialNumberLimit := new(big.Int).Lsh(big.NewInt(1), 128)
@@ -254,7 +259,7 @@ func SelfCert(lg *zap.Logger, dirpath string, hosts []string, selfSignedCertVali
 				zap.Error(err),
 			)
 		}
-		return
+		return info, err
 	}
 
 	tmpl := x509.Certificate{
@@ -292,7 +297,7 @@ func SelfCert(lg *zap.Logger, dirpath string, hosts []string, selfSignedCertVali
 				zap.Error(err),
 			)
 		}
-		return
+		return info, err
 	}
 
 	derBytes, err := x509.CreateCertificate(rand.Reader, &tmpl, &tmpl, &priv.PublicKey, priv)
@@ -303,7 +308,7 @@ func SelfCert(lg *zap.Logger, dirpath string, hosts []string, selfSignedCertVali
 				zap.Error(err),
 			)
 		}
-		return
+		return info, err
 	}
 
 	certOut, err := os.Create(certPath)
@@ -313,7 +318,7 @@ func SelfCert(lg *zap.Logger, dirpath string, hosts []string, selfSignedCertVali
 			zap.String("path", certPath),
 			zap.Error(err),
 		)
-		return
+		return info, err
 	}
 	pem.Encode(certOut, &pem.Block{Type: "CERTIFICATE", Bytes: derBytes})
 	certOut.Close()
@@ -323,7 +328,7 @@ func SelfCert(lg *zap.Logger, dirpath string, hosts []string, selfSignedCertVali
 
 	b, err := x509.MarshalECPrivateKey(priv)
 	if err != nil {
-		return
+		return info, err
 	}
 	keyOut, err := os.OpenFile(keyPath, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0600)
 	if err != nil {
@@ -334,7 +339,7 @@ func SelfCert(lg *zap.Logger, dirpath string, hosts []string, selfSignedCertVali
 				zap.Error(err),
 			)
 		}
-		return
+		return info, err
 	}
 	pem.Encode(keyOut, &pem.Block{Type: "EC PRIVATE KEY", Bytes: b})
 	keyOut.Close()

etcdctl/main_test.go

@@ -21,7 +21,9 @@ import (
 	"testing"
 )
 
-func SplitTestArgs(args []string) (testArgs, appArgs []string) {
+func SplitTestArgs(args []string) ([]string, []string) {
+	var testArgs, appArgs []string
+
 	for i, arg := range args {
 		switch {
 		case strings.HasPrefix(arg, "-test."):
@@ -33,7 +35,7 @@ func SplitTestArgs(args []string) (testArgs, appArgs []string) {
 			appArgs = append(appArgs, arg)
 		}
 	}
-	return
+	return testArgs, appArgs
 }
 
 // TestEmpty is an empty test to avoid no-tests warning.

etcdutl/main_test.go

@@ -21,7 +21,9 @@ import (
 	"testing"
 )
 
-func SplitTestArgs(args []string) (testArgs, appArgs []string) {
+func SplitTestArgs(args []string) ([]string, []string) {
+	var testArgs, appArgs []string
+
 	for i, arg := range args {
 		switch {
 		case strings.HasPrefix(arg, "-test."):
@@ -33,7 +35,7 @@ func SplitTestArgs(args []string) (testArgs, appArgs []string) {
 			appArgs = append(appArgs, arg)
 		}
 	}
-	return
+	return testArgs, appArgs
 }
 
 // TestEmpty is empty test to avoid no-tests warning.

scripts/test.sh

@@ -424,8 +424,7 @@ function ineffassign_pass {
 }
 
 function nakedret_pass {
-  # TODO: nakedret should work with -set_exit_status
+  run_for_modules generic_checker run_go_tool "github.com/alexkohler/nakedret/cmd/nakedret"
-  run_for_modules generic_checker run_go_tool "github.com/alexkohler/nakedret"
 }
 
 function license_header_per_module {

server/etcdserver/bootstrap_test.go

@@ -216,27 +216,32 @@ func TestBootstrapBackend(t *testing.T) {
 	}
 }
 
-func createDataDir(t *testing.T) (dataDir string, err error) {
+func createDataDir(t *testing.T) (string, error) {
+	var err error
+
 	// create the temporary data dir
-	dataDir = t.TempDir()
+	dataDir := t.TempDir()
 
 	// create ${dataDir}/member/snap
 	if err = os.MkdirAll(datadir.ToSnapDir(dataDir), 0700); err != nil {
-		return
+		return "", err
 	}
 
 	// create ${dataDir}/member/wal
 	err = os.MkdirAll(datadir.ToWalDir(dataDir), 0700)
+	if err != nil {
+		return "", err
+	}
 
-	return
+	return dataDir, nil
 }
 
 // prepare data for the test case
-func prepareData(cfg config.ServerConfig) (err error) {
+func prepareData(cfg config.ServerConfig) error {
 	var snapshotTerm, snapshotIndex uint64 = 2, 5
 
-	if err = createWALFileWithSnapshotRecord(cfg, snapshotTerm, snapshotIndex); err != nil {
+	if err := createWALFileWithSnapshotRecord(cfg, snapshotTerm, snapshotIndex); err != nil {
-		return
+		return err
 	}
 
 	return createSnapshotAndBackendDB(cfg, snapshotTerm, snapshotIndex)
@@ -245,7 +250,7 @@ func prepareData(cfg config.ServerConfig) (err error) {
 func createWALFileWithSnapshotRecord(cfg config.ServerConfig, snapshotTerm, snapshotIndex uint64) (err error) {
 	var w *wal.WAL
 	if w, err = wal.Create(cfg.Logger, cfg.WALDir(), []byte("somedata")); err != nil {
-		return
+		return err
 	}
 
 	defer func() {
@@ -262,13 +267,15 @@ func createWALFileWithSnapshotRecord(cfg config.ServerConfig, snapshotTerm, snap
 	}
 
 	if err = w.SaveSnapshot(walSnap); err != nil {
-		return
+		return err
 	}
 
 	return w.Save(raftpb.HardState{Term: snapshotTerm, Vote: 3, Commit: snapshotIndex}, nil)
 }
 
-func createSnapshotAndBackendDB(cfg config.ServerConfig, snapshotTerm, snapshotIndex uint64) (err error) {
+func createSnapshotAndBackendDB(cfg config.ServerConfig, snapshotTerm, snapshotIndex uint64) error {
+	var err error
+
 	confState := raftpb.ConfState{
 		Voters: []uint64{1, 2, 3},
 	}
@@ -283,7 +290,7 @@ func createSnapshotAndBackendDB(cfg config.ServerConfig, snapshotTerm, snapshotI
 			Term:      snapshotTerm,
 		},
 	}); err != nil {
-		return
+		return err
 	}
 
 	// create snapshot db file: "%016x.snap.db"
@@ -292,11 +299,11 @@ func createSnapshotAndBackendDB(cfg config.ServerConfig, snapshotTerm, snapshotI
 	schema.UnsafeUpdateConsistentIndex(be.BatchTx(), snapshotIndex, snapshotTerm)
 	schema.MustUnsafeSaveConfStateToBackend(cfg.Logger, be.BatchTx(), &confState)
 	if err = be.Close(); err != nil {
-		return
+		return err
 	}
 	sdb := filepath.Join(cfg.SnapDir(), fmt.Sprintf("%016x.snap.db", snapshotIndex))
 	if err = os.Rename(cfg.BackendPath(), sdb); err != nil {
-		return
+		return err
 	}
 
 	// create backend db file

server/main_test.go

@@ -25,7 +25,9 @@ import (
 	"go.etcd.io/etcd/server/v3/etcdmain"
 )
 
-func SplitTestArgs(args []string) (testArgs, appArgs []string) {
+func SplitTestArgs(args []string) ([]string, []string) {
+	var testArgs, appArgs []string
+
 	for i, arg := range args {
 		switch {
 		case strings.HasPrefix(arg, "-test."):
@@ -37,7 +39,7 @@ func SplitTestArgs(args []string) (testArgs, appArgs []string) {
 			appArgs = append(appArgs, arg)
 		}
 	}
-	return
+	return testArgs, appArgs
 }
 
 func TestEmpty(t *testing.T) {}

server/storage/wal/wal.go

@@ -553,7 +553,7 @@ func (w *WAL) ReadAll() (metadata []byte, state raftpb.HardState, ents []raftpb.
 		// create encoder (chain crc with the decoder), enable appending
 		w.encoder, err = newFileEncoder(w.tail().File, w.decoder.LastCRC())
 		if err != nil {
-			return
+			return nil, state, nil, err
 		}
 	}
 	w.decoder = nil

tests/robustness/validate/operations.go

@@ -28,24 +28,22 @@ import (
 	"go.etcd.io/etcd/tests/v3/robustness/model"
 )
 
-func validateOperationsAndVisualize(t *testing.T, lg *zap.Logger, operations []porcupine.Operation, eventHistory []model.WatchEvent) (visualize func(basepath string) error) {
+func validateOperationsAndVisualize(t *testing.T, lg *zap.Logger, operations []porcupine.Operation, eventHistory []model.WatchEvent) func(basepath string) error {
 	const timeout = 5 * time.Minute
 	lg.Info("Validating linearizable operations", zap.Duration("timeout", timeout))
 	result, visualize := validateLinearizableOperationAndVisualize(lg, operations, timeout)
 	switch result {
 	case porcupine.Illegal:
 		t.Error("Linearization failed")
-		return
 	case porcupine.Unknown:
 		t.Error("Linearization has timed out")
-		return
 	case porcupine.Ok:
 		t.Log("Linearization success")
+		lg.Info("Validating serializable operations")
+		validateSerializableOperations(t, operations, eventHistory)
 	default:
 		t.Fatalf("Unknown Linearization")
 	}
-	lg.Info("Validating serializable operations")
-	validateSerializableOperations(t, operations, eventHistory)
 	return visualize
 }