Added checks for shoot generation before restore

hack/runtime-migrator/cmd/restore/restore.go

@@ -87,6 +87,20 @@ func (r Restore) Do(ctx context.Context, runtimeIDs []string) error {
 			continue
 		}
 
+		if currentShoot.Generation == objectsToRestore.OriginalShoot.Generation {
+			slog.Warn("Verify the current state of the system. Shoot was not modified after backup was prepared. Skipping.", "runtimeID", runtimeID)
+			r.results.OperationSkipped(runtimeID, currentShoot.Name)
+
+			continue
+		}
+
+		if currentShoot.Generation > objectsToRestore.OriginalShoot.Generation+1 {
+			slog.Warn("Verify the current state of the system. Restore should be performed manually, as the backup may overwrite more that on change.", "runtimeID", runtimeID)
+			r.results.AutomaticRestoreImpossible(runtimeID, currentShoot.Name)
+
+			continue
+		}
+
 		if r.cfg.IsDryRun {
 			slog.Info("Runtime processed successfully (dry-run)", "runtimeID", runtimeID)
 			r.results.OperationSucceeded(runtimeID, currentShoot.Name)
@@ -112,7 +126,7 @@ func (r Restore) Do(ctx context.Context, runtimeIDs []string) error {
 		return err
 	}
 
-	slog.Info(fmt.Sprintf("Restore completed. Successfully restored backups: %d, Failed operations: %d", r.results.Succeeded, r.results.Failed))
+	slog.Info(fmt.Sprintf("Restore completed. Successfully restored backups: %d, Failed operations: %d, Skipped backups: %d, ", r.results.Succeeded, r.results.Failed, r.results.Skipped))
 	slog.Info(fmt.Sprintf("Restore results saved in: %s", resultsFile))
 
 	return nil

hack/runtime-migrator/internal/restore/results.go

@@ -3,8 +3,10 @@ package restore
 type StatusType string
 
 const (
-	StatusSuccess StatusType = "Success"
-	StatusError   StatusType = "Error"
+	StatusSuccess        StatusType = "Success"
+	StatusError          StatusType = "Error"
+	StatusRestoreSkipped            = "Skipped"
+	StatusUpdateDetected            = "UpdateDetected"
 )
 
 type RuntimeResult struct {
@@ -18,6 +20,8 @@ type Results struct {
 	Results         []RuntimeResult
 	Succeeded       int
 	Failed          int
+	Skipped         int
+	UpdateDetected  int
 	OutputDirectory string
 }
 
@@ -50,3 +54,25 @@ func (br *Results) OperationSucceeded(runtimeID string, shootName string) {
 	br.Succeeded++
 	br.Results = append(br.Results, result)
 }
+
+func (br *Results) OperationSkipped(runtimeID string, shootName string) {
+	result := RuntimeResult{
+		RuntimeID: runtimeID,
+		ShootName: shootName,
+		Status:    StatusRestoreSkipped,
+	}
+
+	br.Skipped++
+	br.Results = append(br.Results, result)
+}
+
+func (br *Results) AutomaticRestoreImpossible(runtimeID string, shootName string) {
+	result := RuntimeResult{
+		RuntimeID: runtimeID,
+		ShootName: shootName,
+		Status:    StatusUpdateDetected,
+	}
+
+	br.UpdateDetected++
+	br.Results = append(br.Results, result)
+}