diff --git a/internal/datamanager/changes.go b/internal/datamanager/changes.go
index 92cde49..35975eb 100644
--- a/internal/datamanager/changes.go
+++ b/internal/datamanager/changes.go
@@ -72,28 +72,11 @@ func (c *WalChanges) putRevision(revision int64) {
 	c.revision = revision
 }
 
-func (c *WalChanges) curWalSeq() string {
-	return c.walSeq
-}
-
 func (c *WalChanges) getPut(dataType, id string) (string, bool) {
 	walseq, ok := c.puts[dataType][id]
 	return walseq, ok
 }
 
-func (c *WalChanges) getDeletesMap() map[string]struct{} {
-	dmap := map[string]struct{}{}
-	for p := range c.deletes {
-		dmap[p] = struct{}{}
-	}
-	return dmap
-}
-
-func (c *WalChanges) getDelete(p string) bool {
-	_, ok := c.deletes[p]
-	return ok
-}
-
 func (c *WalChanges) addPut(dataType, id, walseq string, revision int64) {
 	delete(c.deletes[dataType], id)
 	c.puts[dataType][id] = walseq
@@ -188,7 +171,7 @@ func (d *DataManager) applyWalChangesAction(ctx context.Context, action *Action,
 	d.changes.actions[walSequence] = append(d.changes.actions[walSequence], action)
 }
 
-func (d *DataManager) watcherLoop(ctx context.Context) error {
+func (d *DataManager) watcherLoop(ctx context.Context) {
 	for {
 		initialized := d.changes.initialized
 		if !initialized {
@@ -204,7 +187,7 @@ func (d *DataManager) watcherLoop(ctx context.Context) error {
 		select {
 		case <-ctx.Done():
 			d.log.Infof("watcher exiting")
-			return nil
+			return
 		default:
 		}
 
diff --git a/internal/datamanager/datamanager.go b/internal/datamanager/datamanager.go
index 1ec1f60..1009dd9 100644
--- a/internal/datamanager/datamanager.go
+++ b/internal/datamanager/datamanager.go
@@ -166,9 +166,8 @@ func (d *DataManager) Run(ctx context.Context, readyCh chan struct{}) error {
 	go d.compactChangeGroupsLoop(ctx)
 	go d.etcdPingerLoop(ctx)
 
-	select {
-	case <-ctx.Done():
-		d.log.Infof("walmanager exiting")
-		return nil
-	}
+	<-ctx.Done()
+	d.log.Infof("walmanager exiting")
+
+	return nil
 }
diff --git a/internal/datamanager/datamanager_test.go b/internal/datamanager/datamanager_test.go
index bc5b6a8..a27b62c 100644
--- a/internal/datamanager/datamanager_test.go
+++ b/internal/datamanager/datamanager_test.go
@@ -38,7 +38,6 @@ import (
 
 var level = zap.NewAtomicLevelAt(zapcore.InfoLevel)
 var logger = slog.New(level)
-var log = logger.Sugar()
 
 func setupEtcd(t *testing.T, dir string) *testutil.TestEmbeddedEtcd {
 	tetcd, err := testutil.NewTestEmbeddedEtcd(t, logger, dir)
@@ -56,17 +55,10 @@ func setupEtcd(t *testing.T, dir string) *testutil.TestEmbeddedEtcd {
 
 func shutdownEtcd(tetcd *testutil.TestEmbeddedEtcd) {
 	if tetcd.Etcd != nil {
-		tetcd.Kill()
+		_ = tetcd.Kill()
 	}
 }
 
-type noopCheckpointer struct {
-}
-
-func (c *noopCheckpointer) Checkpoint(ctx context.Context, action *Action) error {
-	return nil
-}
-
 func TestEtcdReset(t *testing.T) {
 	dir, err := ioutil.TempDir("", "agola")
 	if err != nil {
@@ -75,12 +67,18 @@ func TestEtcdReset(t *testing.T) {
 	defer os.RemoveAll(dir)
 
 	etcdDir, err := ioutil.TempDir(dir, "etcd")
+	if err != nil {
+		t.Fatalf("unexpected err: %v", err)
+	}
 	tetcd := setupEtcd(t, etcdDir)
 	defer shutdownEtcd(tetcd)
 
 	ctx, cancel := context.WithCancel(context.Background())
 
 	ostDir, err := ioutil.TempDir(dir, "ost")
+	if err != nil {
+		t.Fatalf("unexpected err: %v", err)
+	}
 
 	ost, err := posix.New(ostDir)
 	if err != nil {
@@ -95,10 +93,13 @@ func TestEtcdReset(t *testing.T) {
 		DataTypes:       []string{"datatype01"},
 	}
 	dm, err := NewDataManager(ctx, logger, dmConfig)
+	if err != nil {
+		t.Fatalf("unexpected err: %v", err)
+	}
 	dmReadyCh := make(chan struct{})
 
 	t.Logf("starting datamanager")
-	go dm.Run(ctx, dmReadyCh)
+	go func() { _ = dm.Run(ctx, dmReadyCh) }()
 	<-dmReadyCh
 
 	actions := []*Action{
@@ -109,10 +110,8 @@ func TestEtcdReset(t *testing.T) {
 		},
 	}
 
-	expectedObjects := []string{}
 	for i := 0; i < 20; i++ {
 		objectID := fmt.Sprintf("object%02d", i)
-		expectedObjects = append(expectedObjects, objectID)
 		actions[0].ID = objectID
 		if _, err := dm.WriteWal(ctx, actions, nil); err != nil {
 			t.Fatalf("unexpected err: %v", err)
@@ -128,7 +127,9 @@ func TestEtcdReset(t *testing.T) {
 	t.Logf("stopping etcd")
 	// Reset etcd
 	shutdownEtcd(tetcd)
-	tetcd.WaitDown(10 * time.Second)
+	if err := tetcd.WaitDown(10 * time.Second); err != nil {
+		t.Fatalf("unexpected err: %v", err)
+	}
 	t.Logf("resetting etcd")
 	os.RemoveAll(etcdDir)
 	t.Logf("starting etcd")
@@ -149,10 +150,13 @@ func TestEtcdReset(t *testing.T) {
 		DataTypes:       []string{"datatype01"},
 	}
 	dm, err = NewDataManager(ctx, logger, dmConfig)
+	if err != nil {
+		t.Fatalf("unexpected err: %v", err)
+	}
 	dmReadyCh = make(chan struct{})
 
 	t.Logf("starting datamanager")
-	go dm.Run(ctx, dmReadyCh)
+	go func() { _ = dm.Run(ctx, dmReadyCh) }()
 	<-dmReadyCh
 
 	time.Sleep(5 * time.Second)
@@ -174,12 +178,18 @@ func TestConcurrentUpdate(t *testing.T) {
 	defer os.RemoveAll(dir)
 
 	etcdDir, err := ioutil.TempDir(dir, "etcd")
+	if err != nil {
+		t.Fatalf("unexpected err: %v", err)
+	}
 	tetcd := setupEtcd(t, etcdDir)
 	defer shutdownEtcd(tetcd)
 
 	ctx := context.Background()
 
 	ostDir, err := ioutil.TempDir(dir, "ost")
+	if err != nil {
+		t.Fatalf("unexpected err: %v", err)
+	}
 
 	ost, err := posix.New(ostDir)
 	if err != nil {
@@ -193,6 +203,9 @@ func TestConcurrentUpdate(t *testing.T) {
 		DataTypes:       []string{"datatype01"},
 	}
 	dm, err := NewDataManager(ctx, logger, dmConfig)
+	if err != nil {
+		t.Fatalf("unexpected err: %v", err)
+	}
 
 	actions := []*Action{
 		{
@@ -204,7 +217,7 @@ func TestConcurrentUpdate(t *testing.T) {
 	}
 
 	dmReadyCh := make(chan struct{})
-	go dm.Run(ctx, dmReadyCh)
+	go func() { _ = dm.Run(ctx, dmReadyCh) }()
 	<-dmReadyCh
 
 	time.Sleep(5 * time.Second)
@@ -236,7 +249,7 @@ func TestConcurrentUpdate(t *testing.T) {
 
 	oldcgt = cgt
 	// this must work successfully
-	cgt, err = dm.WriteWal(ctx, actions, cgt)
+	_, err = dm.WriteWal(ctx, actions, cgt)
 	if err != nil {
 		t.Fatalf("unexpected err: %v", err)
 	}
@@ -256,12 +269,18 @@ func TestWalCleaner(t *testing.T) {
 	defer os.RemoveAll(dir)
 
 	etcdDir, err := ioutil.TempDir(dir, "etcd")
+	if err != nil {
+		t.Fatalf("unexpected err: %v", err)
+	}
 	tetcd := setupEtcd(t, etcdDir)
 	defer shutdownEtcd(tetcd)
 
 	ctx := context.Background()
 
 	ostDir, err := ioutil.TempDir(dir, "ost")
+	if err != nil {
+		t.Fatalf("unexpected err: %v", err)
+	}
 
 	ost, err := posix.New(ostDir)
 	if err != nil {
@@ -277,6 +296,9 @@ func TestWalCleaner(t *testing.T) {
 		MinCheckpointWalsNum: 1,
 	}
 	dm, err := NewDataManager(ctx, logger, dmConfig)
+	if err != nil {
+		t.Fatalf("unexpected err: %v", err)
+	}
 
 	actions := []*Action{
 		{
@@ -288,7 +310,7 @@ func TestWalCleaner(t *testing.T) {
 	}
 
 	dmReadyCh := make(chan struct{})
-	go dm.Run(ctx, dmReadyCh)
+	go func() { _ = dm.Run(ctx, dmReadyCh) }()
 	<-dmReadyCh
 
 	for i := 0; i < 20; i++ {
@@ -321,12 +343,18 @@ func TestReadObject(t *testing.T) {
 	defer os.RemoveAll(dir)
 
 	etcdDir, err := ioutil.TempDir(dir, "etcd")
+	if err != nil {
+		t.Fatalf("unexpected err: %v", err)
+	}
 	tetcd := setupEtcd(t, etcdDir)
 	defer shutdownEtcd(tetcd)
 
 	ctx := context.Background()
 
 	ostDir, err := ioutil.TempDir(dir, "ost")
+	if err != nil {
+		t.Fatalf("unexpected err: %v", err)
+	}
 	ost, err := posix.New(ostDir)
 	if err != nil {
 		t.Fatalf("unexpected err: %v", err)
@@ -340,9 +368,12 @@ func TestReadObject(t *testing.T) {
 		DataTypes:       []string{"datatype01"},
 	}
 	dm, err := NewDataManager(ctx, logger, dmConfig)
+	if err != nil {
+		t.Fatalf("unexpected err: %v", err)
+	}
 
 	dmReadyCh := make(chan struct{})
-	go dm.Run(ctx, dmReadyCh)
+	go func() { _ = dm.Run(ctx, dmReadyCh) }()
 	<-dmReadyCh
 
 	time.Sleep(5 * time.Second)
@@ -479,12 +510,18 @@ func TestCheckpoint(t *testing.T) {
 	defer os.RemoveAll(dir)
 
 	etcdDir, err := ioutil.TempDir(dir, "etcd")
+	if err != nil {
+		t.Fatalf("unexpected err: %v", err)
+	}
 	tetcd := setupEtcd(t, etcdDir)
 	defer shutdownEtcd(tetcd)
 
 	ctx := context.Background()
 
 	ostDir, err := ioutil.TempDir(dir, "ost")
+	if err != nil {
+		t.Fatalf("unexpected err: %v", err)
+	}
 	ost, err := posix.New(ostDir)
 	if err != nil {
 		t.Fatalf("unexpected err: %v", err)
@@ -502,8 +539,11 @@ func TestCheckpoint(t *testing.T) {
 		MaxDataFileSize: 10 * 1024,
 	}
 	dm, err := NewDataManager(ctx, logger, dmConfig)
+	if err != nil {
+		t.Fatalf("unexpected err: %v", err)
+	}
 	dmReadyCh := make(chan struct{})
-	go dm.Run(ctx, dmReadyCh)
+	go func() { _ = dm.Run(ctx, dmReadyCh) }()
 	<-dmReadyCh
 
 	time.Sleep(5 * time.Second)
@@ -667,7 +707,7 @@ func TestCheckpoint(t *testing.T) {
 	}
 	actionGroups = append(actionGroups, actions)
 
-	currentEntries, err = testCheckpoint(t, ctx, dm, actionGroups, currentEntries)
+	_, err = testCheckpoint(t, ctx, dm, actionGroups, currentEntries)
 	if err != nil {
 		t.Fatalf("unexpected err: %v", err)
 	}
diff --git a/internal/datamanager/wal.go b/internal/datamanager/wal.go
index 823c5e2..fc279a8 100644
--- a/internal/datamanager/wal.go
+++ b/internal/datamanager/wal.go
@@ -143,24 +143,6 @@ func (d *DataManager) ReadObject(dataType, id string, cgNames []string) (io.Read
 	return ioutil.NopCloser(f), cgt, err
 }
 
-func (d *DataManager) changesList(paths []string, prefix, startWith string, recursive bool) []string {
-	fpaths := []string{}
-	for _, p := range paths {
-		if !recursive && len(p) > len(prefix) {
-			rel := strings.TrimPrefix(p, prefix)
-			skip := strings.Contains(rel, d.ost.Delimiter())
-			if skip {
-				continue
-			}
-		}
-		if strings.HasPrefix(p, prefix) && p > startWith {
-			fpaths = append(fpaths, p)
-		}
-	}
-
-	return fpaths
-}
-
 func (d *DataManager) HasOSTWal(walseq string) (bool, error) {
 	_, err := d.ost.Stat(d.storageWalStatusFile(walseq) + ".committed")
 	if err == ostypes.ErrNotExist {
@@ -601,7 +583,7 @@ func (d *DataManager) sync(ctx context.Context) error {
 	if err := m.Lock(ctx); err != nil {
 		return err
 	}
-	defer m.Unlock(ctx)
+	defer func() { _ = m.Unlock(ctx) }()
 
 	resp, err := d.e.List(ctx, etcdWalsDir+"/", "", 0)
 	if err != nil {
@@ -695,7 +677,7 @@ func (d *DataManager) checkpoint(ctx context.Context) error {
 	if err := m.Lock(ctx); err != nil {
 		return err
 	}
-	defer m.Unlock(ctx)
+	defer func() { _ = m.Unlock(ctx) }()
 
 	resp, err := d.e.List(ctx, etcdWalsDir+"/", "", 0)
 	if err != nil {
@@ -774,7 +756,7 @@ func (d *DataManager) walCleaner(ctx context.Context) error {
 	if err := m.Lock(ctx); err != nil {
 		return err
 	}
-	defer m.Unlock(ctx)
+	defer func() { _ = m.Unlock(ctx) }()
 
 	resp, err := d.e.List(ctx, etcdWalsDir+"/", "", 0)
 	if err != nil {