custom-kube-scheduler/kubernetes-v1.15.4/cmd/kubeadm/app/util/config/strict/strict.go

/*
Copyright 2018 The Kubernetes Authors.

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/

package strict

import (
	"github.com/pkg/errors"

	"k8s.io/apimachinery/pkg/runtime/schema"
	"k8s.io/klog"
	"k8s.io/kubernetes/cmd/kubeadm/app/apis/kubeadm/scheme"
	"k8s.io/kubernetes/cmd/kubeadm/app/componentconfigs"
	"sigs.k8s.io/yaml"
)

// VerifyUnmarshalStrict takes a YAML byte slice and a GroupVersionKind and verifies if the YAML
// schema is known and if it unmarshals with strict mode.
//
// TODO(neolit123): The returned error here is currently ignored everywhere and a klog warning is thrown instead.
// We don't want to turn this into an actual error yet. Eventually this can be controlled with an optional CLI flag.
func VerifyUnmarshalStrict(bytes []byte, gvk schema.GroupVersionKind) error {

	var (
		iface interface{}
		err   error
	)

	iface, err = scheme.Scheme.New(gvk)
	if err != nil {
		iface, err = componentconfigs.Scheme.New(gvk)
		if err != nil {
			err := errors.Errorf("unknown configuration %#v for scheme definitions in %q and %q",
				gvk, scheme.Scheme.Name(), componentconfigs.Scheme.Name())
			klog.Warning(err.Error())
			return err
		}
	}

	if err := yaml.UnmarshalStrict(bytes, iface); err != nil {
		err := errors.Wrapf(err, "error unmarshaling configuration %#v", gvk)
		klog.Warning(err.Error())
		return err
	}
	return nil
}