[#1175] metabase: Implement LOCK operation

Implement `DB.Lock` method which marks list of the objects as locked by
another object. Only regular objects can be locked.

Signed-off-by: Leonard Lyubich <leonard@nspcc.ru>

pkg/local_object_storage/metabase/lock_test.go

@@ -0,0 +1,49 @@
+package meta_test
+
+import (
+	"testing"
+
+	objectCore "github.com/nspcc-dev/neofs-node/pkg/core/object"
+	meta "github.com/nspcc-dev/neofs-node/pkg/local_object_storage/metabase"
+	cidtest "github.com/nspcc-dev/neofs-sdk-go/container/id/test"
+	"github.com/nspcc-dev/neofs-sdk-go/object"
+	oid "github.com/nspcc-dev/neofs-sdk-go/object/id"
+	oidtest "github.com/nspcc-dev/neofs-sdk-go/object/id/test"
+	objecttest "github.com/nspcc-dev/neofs-sdk-go/object/test"
+	"github.com/stretchr/testify/require"
+)
+
+func TestDB_Lock(t *testing.T) {
+	cnr := *cidtest.ID()
+	db := newDB(t)
+
+	t.Run("empty locked list", func(t *testing.T) {
+		require.Panics(t, func() { _ = db.Lock(cnr, oid.ID{}, nil) })
+		require.Panics(t, func() { _ = db.Lock(cnr, oid.ID{}, []oid.ID{}) })
+	})
+
+	t.Run("(ir)regular", func(t *testing.T) {
+		for _, typ := range [...]object.Type{
+			object.TypeTombstone,
+			object.TypeStorageGroup,
+			object.TypeLock,
+			object.TypeRegular,
+		} {
+			obj := objecttest.Raw()
+			obj.SetType(typ)
+			obj.SetContainerID(&cnr)
+
+			// save irregular object
+			err := meta.Put(db, objectCore.NewFromSDK(obj.Object()), nil)
+			require.NoError(t, err, typ)
+
+			// try to lock it
+			err = db.Lock(cnr, *oidtest.ID(), []oid.ID{*obj.ID()})
+			if typ == object.TypeRegular {
+				require.NoError(t, err, typ)
+			} else {
+				require.ErrorIs(t, err, meta.ErrLockIrregularObject, typ)
+			}
+		}
+	})
+}