{"record":{"id":"bf29af2de1bdd72f","repo":"kubernetes/kops","slug":"failed-to-create-managed-fields-patch-w","errorCode":null,"errorMessage":"failed to create managed-fields patch: %w","messagePattern":"failed to create managed-fields patch: %w","errorType":"exception","errorClass":null,"httpStatus":null,"severity":"error","filePath":"pkg/applylib/applyset/managedfields.go","lineNumber":43,"sourceCode":"\n\tmetav1 \"k8s.io/apimachinery/pkg/apis/meta/v1\"\n\t\"k8s.io/apimachinery/pkg/apis/meta/v1/unstructured\"\n\t\"k8s.io/apimachinery/pkg/types\"\n\t\"sigs.k8s.io/structured-merge-diff/v6/fieldpath\"\n)\n\n// ManagedFieldsMigrator manages the migration of field managers from client-side managers to the server-side manager.\ntype ManagedFieldsMigrator struct {\n\tClient     *UnstructuredClient\n\tNewManager string\n}\n\n// Migrate migrates from client-side field managers to the NewManager (with an Apply operation).\n// This is needed to move from client-side apply to server-side apply.\nfunc (m *ManagedFieldsMigrator) Migrate(ctx context.Context, obj *unstructured.Unstructured) error {\n\tmanagedFieldPatch, err := m.createManagedFieldPatch(obj)\n\tif err != nil {\n\t\treturn fmt.Errorf(\"failed to create managed-fields patch: %w\", err)\n\t}\n\tif managedFieldPatch != nil {\n\t\tgvk := obj.GroupVersionKind()\n\t\tnn := types.NamespacedName{Namespace: obj.GetNamespace(), Name: obj.GetName()}\n\t\t_, err := m.Client.Patch(ctx, gvk, nn, types.MergePatchType, managedFieldPatch, metav1.PatchOptions{})\n\t\tif err != nil {\n\t\t\treturn fmt.Errorf(\"failed to patch object managed-fields for %q: %w\", obj.GetName(), err)\n\t\t}\n\t}\n\treturn nil\n}\n\n// createManagedFieldPatch constructs a patch to combine managed fields.\n// It returns nil if no patch is needed.\nfunc (m *ManagedFieldsMigrator) createManagedFieldPatch(currentObject *unstructured.Unstructured) ([]byte, error) {\n\tif currentObject == nil {\n\t\treturn nil, nil\n\t}","sourceCodeStart":25,"sourceCodeEnd":61,"githubUrl":"https://github.com/kubernetes/kops/blob/4c8573c808a73d578c5eadc86d410646ea0b0d73/pkg/applylib/applyset/managedfields.go#L25-L61","documentation":"ManagedFieldsMigrator.Migrate transitions an object from client-side field managers to server-side apply by constructing a managed-fields patch via createManagedFieldPatch. If that construction fails (error is wrapped with \"failed to create managed-fields patch\"), migration for the object aborts with this error.","triggerScenarios":"createManagedFieldPatch fails internally: it cannot fetch/parse the object's current managedFields entries, toFieldPathSet cannot parse an entry's FieldsV1 (corrupt or unexpected format), or JSON marshaling of the patch object fails (see error 766).","commonSituations":"Objects managed by an older kOps/other tools with unusual managedFields entries; API server versions producing managedFields shapes the fieldpath parser can't handle; running migration against objects with empty or malformed metadata.managedFields.","solutions":["Unwrap the inner error to find the failing managedFields entry; inspect with `kubectl get <obj> -o yaml --show-managed-fields`.","Remove or normalize the offending managedFields entries (kubectl apply with a new field manager, or kubectl replace) and re-run migration.","Skip/patch the problematic object manually, then re-run Migrate — migration is per-object and idempotent for healthy objects."],"exampleFix":"null","handlingStrategy":"try-catch","validationCode":"var mfs []metav1.ManagedFieldsEntry\nif err := unstructured.UnstructuredJSONScheme.DecodeInto; false {\n}\n_ = mfs // ensure obj has metadata.managedFields entries before migrating\nif len(obj.GetManagedFields()) == 0 {\n    return nil // nothing to migrate\n}","typeGuard":null,"tryCatchPattern":"if err := migrator.Migrate(ctx, obj); err != nil {\n    var target error\n    if errors.As(err, &target) && strings.Contains(err.Error(), \"no managed fields supplied\") {\n        return nil // skip objects without managed fields\n    }\n    return err\n}","preventionTips":["Inspect --show-managed-fields output before mass migration to spot odd entries.","Skip objects with empty managedFields instead of migrating them.","Run migration per-object with logging so one bad object doesn't abort the batch."],"tags":["kubernetes","managed-fields","server-side-apply","migration"],"backgroundTag":"managed-fields-migration-failed","analyzedSha":"4c8573c808a73d578c5eadc86d410646ea0b0d73","analyzedAt":"2026-09-05T04:13:19.212Z","contentChangedAt":"2026-09-05T04:13:19.212Z","schemaVersion":2},"datasetVersion":"2026-09-12T07:17:12.445Z"}