add totalSize to repo snapshot

Signed-off-by: Lyndon-Li <lyonghui@vmware.com>

changelogs/unreleased/9875-Lyndon-Li

@@ -0,0 +1 @@
+Add totalSize to repo snapshot operation; and pin unified repo snapshots to Kopia repository and so pin them with Velero backup lifecycle

pkg/repository/udmrepo/kopialib/lib_repo.go

@@ -626,6 +626,9 @@ func (kr *kopiaRepository) SaveSnapshot(ctx context.Context, snap udmrepo.Snapsh
 		Description: snap.Description,
 		StartTime:   fs.UTCTimestampFromTime(snap.StartTime),
 		EndTime:     fs.UTCTimestampFromTime(snap.EndTime),
+		Stats: snapshot.Stats{
+			TotalFileSize: snap.TotalSize,
+		},
 		RootEntry: &snapshot.DirEntry{
 			Type:        snapshot.EntryTypeDirectory,
 			ObjectID:    rootObj,
@@ -634,9 +637,12 @@ func (kr *kopiaRepository) SaveSnapshot(ctx context.Context, snap udmrepo.Snapsh
 			FileSize:    snap.RootObject.Size,
 			UserID:      snap.RootObject.UserID,
 			GroupID:     snap.RootObject.GroupID,
+			DirSummary: &fs.DirectorySummary{
+				TotalFileSize: snap.TotalSize,
+			},
 		},
 		Tags: snap.Tags,
-		Pins: []string{"velero-pin"},
+		Pins: []string{"velero-pin"}, // pins are meant to prevent snapshot from automatic expiration/deletion.
 	}
 
 	id, err := snapshot.SaveSnapshot(ctx, kr.rawWriter, &manifest)
@@ -663,6 +669,7 @@ func (kr *kopiaRepository) GetSnapshot(ctx context.Context, id udmrepo.ID) (udmr
 		StartTime:   snap.StartTime.ToTime(),
 		EndTime:     snap.EndTime.ToTime(),
 		Tags:        snap.Tags,
+		TotalSize:   snap.Stats.TotalFileSize,
 		RootObject: udmrepo.ObjectMetadata{
 			ID:          udmrepo.ID(snap.RootEntry.ObjectID.String()),
 			Type:        udmrepo.ObjectDataTypeMetadata,

pkg/repository/udmrepo/repo.go

@@ -98,6 +98,7 @@ type Snapshot struct {
 	StartTime   time.Time
 	EndTime     time.Time
 	Tags        map[string]string
+	TotalSize   int64
 	RootObject  ObjectMetadata
 }