[#521] *: use stdlib errors package

Signed-off-by: Evgenii Stratonikov <evgeniy@nspcc.ru>

pkg/local_object_storage/engine/control.go

@@ -1,7 +1,8 @@
 package engine
 
 import (
-	"github.com/pkg/errors"
+	"fmt"
+
 	"go.uber.org/zap"
 )
 
@@ -12,7 +13,7 @@ func (e *StorageEngine) Open() error {
 
 	for id, sh := range e.shards {
 		if err := sh.Open(); err != nil {
-			return errors.Wrapf(err, "could not open shard %s", id)
+			return fmt.Errorf("could not open shard %s: %w", id, err)
 		}
 	}
 
@@ -26,7 +27,7 @@ func (e *StorageEngine) Init() error {
 
 	for id, sh := range e.shards {
 		if err := sh.Init(); err != nil {
-			return errors.Wrapf(err, "could not initialize shard %s", id)
+			return fmt.Errorf("could not initialize shard %s: %w", id, err)
 		}
 	}
 

pkg/local_object_storage/engine/head.go

@@ -1,11 +1,12 @@
 package engine
 
 import (
+	"errors"
+
 	objectSDK "github.com/nspcc-dev/neofs-api-go/pkg/object"
 	"github.com/nspcc-dev/neofs-node/pkg/core/object"
 	"github.com/nspcc-dev/neofs-node/pkg/local_object_storage/shard"
 	"github.com/nspcc-dev/neofs-node/pkg/local_object_storage/util"
-	"github.com/pkg/errors"
 	"go.uber.org/zap"
 )
 

pkg/local_object_storage/engine/shards.go

@@ -1,13 +1,13 @@
 package engine
 
 import (
+	"errors"
 	"fmt"
 
 	"github.com/google/uuid"
 	"github.com/nspcc-dev/hrw"
 	"github.com/nspcc-dev/neofs-api-go/pkg/object"
 	"github.com/nspcc-dev/neofs-node/pkg/local_object_storage/shard"
-	"github.com/pkg/errors"
 )
 
 var errShardNotFound = errors.New("shard not found")
@@ -26,7 +26,7 @@ func (e *StorageEngine) AddShard(opts ...shard.Option) (*shard.ID, error) {
 
 	id, err := generateShardID()
 	if err != nil {
-		return nil, errors.Wrap(err, "could not generate shard ID")
+		return nil, fmt.Errorf("could not generate shard ID: %w", err)
 	}
 
 	e.shards[id.String()] = shard.New(append(opts,