[#1048] metabase: Fix drop buckets during resync

Signed-off-by: Dmitrii Stepanov <d.stepanov@yadro.com>

pkg/local_object_storage/metabase/reset_test.go

@@ -0,0 +1,57 @@
+package meta
+
+import (
+	"context"
+	"fmt"
+	"path/filepath"
+	"testing"
+
+	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/local_object_storage/internal/testutil"
+	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/local_object_storage/shard/mode"
+	"github.com/stretchr/testify/require"
+	"go.etcd.io/bbolt"
+)
+
+type epochState struct{ e uint64 }
+
+func (s epochState) CurrentEpoch() uint64 {
+	return s.e
+}
+
+func TestResetDropsContainerBuckets(t *testing.T) {
+	t.Parallel()
+
+	db := New(
+		[]Option{
+			WithPath(filepath.Join(t.TempDir(), "metabase")),
+			WithPermissions(0o600),
+			WithEpochState(epochState{}),
+		}...,
+	)
+
+	require.NoError(t, db.Open(context.Background(), mode.ReadWrite))
+	require.NoError(t, db.Init())
+
+	defer func() { require.NoError(t, db.Close()) }()
+
+	for idx := 0; idx < 100; idx++ {
+		var putPrm PutPrm
+		putPrm.SetObject(testutil.GenerateObject())
+		putPrm.SetStorageID([]byte(fmt.Sprintf("0/%d", idx)))
+		_, err := db.Put(context.Background(), putPrm)
+		require.NoError(t, err)
+	}
+
+	require.NoError(t, db.Reset())
+
+	var bucketCount int
+	require.NoError(t, db.boltDB.Update(func(tx *bbolt.Tx) error {
+		return tx.ForEach(func(name []byte, b *bbolt.Bucket) error {
+			_, exists := mStaticBuckets[string(name)]
+			require.True(t, exists, "unexpected bucket:"+string(name))
+			bucketCount++
+			return nil
+		})
+	}))
+	require.Equal(t, len(mStaticBuckets), bucketCount)
+}