issue 7094: fallback to full backup if previous snapshot is not found

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

changelogs/unreleased/7097-Lyndon-Li

@@ -0,0 +1 @@
+Fix issue #7094, fallback to full backup if previous snapshot is not found

pkg/uploader/kopia/snapshot.go

@@ -236,10 +236,10 @@ func SnapshotSource(
 
 			mani, err := loadSnapshotFunc(ctx, rep, manifest.ID(parentSnapshot))
 			if err != nil {
-				return "", 0, errors.Wrapf(err, "Failed to load previous snapshot %v from kopia", parentSnapshot)
+				log.WithError(err).Warnf("Failed to load previous snapshot %v from kopia, fallback to full backup", parentSnapshot)
+			} else {
+				previous = append(previous, mani)
 			}
-
-			previous = append(previous, mani)
 		} else {
 			log.Infof("Searching for parent snapshot")
 

pkg/uploader/kopia/snapshot_test.go

@@ -112,7 +112,7 @@ func TestSnapshotSource(t *testing.T) {
 			notError: true,
 		},
 		{
-			name: "failed to load snapshot",
+			name: "failed to load snapshot, should fallback to full backup and not error",
 			args: []mockArgs{
 				{methodName: "LoadSnapshot", returns: []interface{}{manifest, errors.New("failed to load snapshot")}},
 				{methodName: "SaveSnapshot", returns: []interface{}{manifest.ID, nil}},
@@ -122,7 +122,7 @@ func TestSnapshotSource(t *testing.T) {
 				{methodName: "Upload", returns: []interface{}{manifest, nil}},
 				{methodName: "Flush", returns: []interface{}{nil}},
 			},
-			notError: false,
+			notError: true,
 		},
 		{
 			name: "failed to save snapshot",