Expose the VolumeHelper to third-party plugins.

Signed-off-by: Xun Jiang <blackpigletbruce@gmail.com>

pkg/plugin/utils/volumehelper/volume_policy_helper.go

@@ -0,0 +1,62 @@
+/*
+Copyright the Velero contributors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package volumehelper
+
+import (
+	"github.com/sirupsen/logrus"
+	"k8s.io/apimachinery/pkg/runtime"
+	"k8s.io/apimachinery/pkg/runtime/schema"
+	crclient "sigs.k8s.io/controller-runtime/pkg/client"
+
+	"github.com/vmware-tanzu/velero/internal/resourcepolicies"
+	"github.com/vmware-tanzu/velero/internal/volumehelper"
+	velerov1api "github.com/vmware-tanzu/velero/pkg/apis/velero/v1"
+	"github.com/vmware-tanzu/velero/pkg/util/boolptr"
+)
+
+// ShouldPerformSnapshotWithBackup is used for third-party plugins.
+// It supports to check whether the PVC or PodVolume should be backed
+// up on demand. On the other hand, the volumeHelperImpl assume there
+// is a VolumeHelper instance initialized before calling the
+// ShouldPerformXXX functions.
+func ShouldPerformSnapshotWithBackup(
+	unstructured runtime.Unstructured,
+	groupResource schema.GroupResource,
+	backup velerov1api.Backup,
+	crClient crclient.Client,
+	logger logrus.FieldLogger,
+) (bool, error) {
+	resourcePolicies, err := resourcepolicies.GetResourcePoliciesFromBackup(
+		backup,
+		crClient,
+		logger,
+	)
+	if err != nil {
+		return false, err
+	}
+
+	volumeHelperImpl := volumehelper.NewVolumeHelperImpl(
+		resourcePolicies,
+		backup.Spec.SnapshotVolumes,
+		logger,
+		crClient,
+		boolptr.IsSetToTrue(backup.Spec.DefaultVolumesToFsBackup),
+		true,
+	)
+
+	return volumeHelperImpl.ShouldPerformSnapshot(unstructured, groupResource)
+}