Remove comparator references in the migrator

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

@@ -20,7 +20,6 @@ import (
 
 type Migration struct {
 	runtimeMigrator migration.Migrator
-	runtimeVerifier migration.Verifier
 	kcpClient       client.Client
 	shootClient     gardener_types.ShootInterface
 	outputWriter    migration.OutputWriter
@@ -40,7 +39,6 @@ func NewMigration(migratorConfig initialisation.Config, converterConfig config.C
 
 	return Migration{
 		runtimeMigrator: migration.NewMigrator(migratorConfig, kubeconfigProvider, kcpClient),
-		runtimeVerifier: migration.NewVerifier(converterConfig, auditLogConfig),
 		kcpClient:       kcpClient,
 		shootClient:     shootClient,
 		outputWriter:    outputWriter,
@@ -69,17 +67,6 @@ func (m Migration) Do(ctx context.Context, runtimeIDs []string) error {
 		slog.Error(msg, "runtimeID", runtimeID)
 	}
 
-	reportValidationError := func(runtimeID, shootName string, msg string, err error) {
-		errorMsg := fmt.Sprintf("%s: %v", msg, err)
-		results.ValidationErrorOccurred(runtimeID, shootName, errorMsg)
-		slog.Error(msg, "runtimeID", runtimeID)
-	}
-
-	reportUnwantedUpdateDetected := func(runtimeID, shootName string, msg string) {
-		results.ValidationDetectedUnwantedUpdate(runtimeID, shootName)
-		slog.Warn(msg, "runtimeID", runtimeID)
-	}
-
 	reportSuccess := func(runtimeID, shootName string, msg string) {
 		results.OperationSucceeded(runtimeID, shootName)
 		slog.Info(msg, "runtimeID", runtimeID)
@@ -113,23 +100,6 @@ func (m Migration) Do(ctx context.Context, runtimeIDs []string) error {
 			return
 		}
 
-		shootComparisonResult, err := m.runtimeVerifier.Do(runtime, *shootToMigrate)
-		if err != nil {
-			reportValidationError(runtimeID, shootToMigrate.Name, "Failed to verify runtime", err)
-			return
-		}
-
-		if !shootComparisonResult.IsEqual() {
-			err = m.outputWriter.SaveComparisonResult(shootComparisonResult)
-			if err != nil {
-				reportError(runtimeID, shootToMigrate.Name, "Failed to save comparison result", err)
-				return
-			}
-
-			reportUnwantedUpdateDetected(runtimeID, shootToMigrate.Name, "Runtime CR can cause unwanted update in Gardener")
-			return
-		}
-
 		if m.isDryRun {
 			reportSuccess(runtimeID, shootToMigrate.Name, "Runtime processed successfully (dry-run)")
 		} else {

hack/runtime-migrator/internal/migration/output.go

@@ -66,53 +66,6 @@ func (ow OutputWriter) SaveRuntimeCR(runtime v1.Runtime) error {
 	return saveYaml(runtime, fmt.Sprintf("%s/%s.yaml", ow.RuntimeDir, runtime.Name))
 }
 
-func (ow OutputWriter) SaveComparisonResult(comparisonResult ShootComparisonResult) error {
-	comparisonResultsForRuntimeDir := path.Join(ow.ComparisonResultsDir, comparisonResult.RuntimeID)
-	err := os.MkdirAll(comparisonResultsForRuntimeDir, os.ModePerm)
-	if err != nil {
-		return err
-	}
-
-	if comparisonResult.Diff != nil {
-		err = writeResultsToDiffFile(comparisonResult.OriginalShoot.Name, comparisonResult.Diff, comparisonResultsForRuntimeDir)
-		if err != nil {
-			return err
-		}
-	}
-
-	err = saveYaml(comparisonResult.OriginalShoot, path.Join(comparisonResultsForRuntimeDir, "original-shoot.yaml"))
-	if err != nil {
-		return err
-	}
-
-	return saveYaml(comparisonResult.ConvertedShoot, path.Join(comparisonResultsForRuntimeDir, "converted-shoot.yaml"))
-}
-
-func writeResultsToDiffFile(shootName string, difference *Difference, resultsDir string) error {
-	writeAndCloseFunc := func(filePath string, text string) error {
-		file, err := os.Create(filePath)
-		if err != nil {
-			return err
-		}
-		defer func() {
-			if file != nil {
-				err := file.Close()
-				if err != nil {
-					fmt.Printf("failed to close file: %v", err)
-				}
-			}
-		}()
-
-		_, err = file.Write([]byte(text))
-
-		return err
-	}
-
-	diffFile := path.Join(resultsDir, fmt.Sprintf("%s.diff", shootName))
-
-	return writeAndCloseFunc(diffFile, string(*difference))
-}
-
 func saveYaml[T any](object T, path string) error {
 	yamlBytes, err := yaml.Marshal(object)
 	if err != nil {