converter.go

Documentation: helm.sh/helm/v3/pkg/kube

     1  /*
     2  Copyright The Helm Authors.
     3  
     4  Licensed under the Apache License, Version 2.0 (the "License");
     5  you may not use this file except in compliance with the License.
     6  You may obtain a copy of the License at
     7  
     8      http://www.apache.org/licenses/LICENSE-2.0
     9  
    10  Unless required by applicable law or agreed to in writing, software
    11  distributed under the License is distributed on an "AS IS" BASIS,
    12  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    13  See the License for the specific language governing permissions and
    14  limitations under the License.
    15  */
    16  
    17  package kube // import "helm.sh/helm/v3/pkg/kube"
    18  
    19  import (
    20  	"sync"
    21  
    22  	apiextensionsv1 "k8s.io/apiextensions-apiserver/pkg/apis/apiextensions/v1"
    23  	apiextensionsv1beta1 "k8s.io/apiextensions-apiserver/pkg/apis/apiextensions/v1beta1"
    24  	"k8s.io/apimachinery/pkg/api/meta"
    25  	"k8s.io/apimachinery/pkg/runtime"
    26  	"k8s.io/apimachinery/pkg/runtime/schema"
    27  	"k8s.io/cli-runtime/pkg/resource"
    28  	"k8s.io/client-go/kubernetes/scheme"
    29  )
    30  
    31  var k8sNativeScheme *runtime.Scheme
    32  var k8sNativeSchemeOnce sync.Once
    33  
    34  // AsVersioned converts the given info into a runtime.Object with the correct
    35  // group and version set
    36  func AsVersioned(info *resource.Info) runtime.Object {
    37  	return convertWithMapper(info.Object, info.Mapping)
    38  }
    39  
    40  // convertWithMapper converts the given object with the optional provided
    41  // RESTMapping. If no mapping is provided, the default schema versioner is used
    42  func convertWithMapper(obj runtime.Object, mapping *meta.RESTMapping) runtime.Object {
    43  	s := kubernetesNativeScheme()
    44  	var gv = runtime.GroupVersioner(schema.GroupVersions(s.PrioritizedVersionsAllGroups()))
    45  	if mapping != nil {
    46  		gv = mapping.GroupVersionKind.GroupVersion()
    47  	}
    48  	if obj, err := runtime.ObjectConvertor(s).ConvertToVersion(obj, gv); err == nil {
    49  		return obj
    50  	}
    51  	return obj
    52  }
    53  
    54  // kubernetesNativeScheme returns a clean *runtime.Scheme with _only_ Kubernetes
    55  // native resources added to it. This is required to break free of custom resources
    56  // that may have been added to scheme.Scheme due to Helm being used as a package in
    57  // combination with e.g. a versioned kube client. If we would not do this, the client
    58  // may attempt to perform e.g. a 3-way-merge strategy patch for custom resources.
    59  func kubernetesNativeScheme() *runtime.Scheme {
    60  	k8sNativeSchemeOnce.Do(func() {
    61  		k8sNativeScheme = runtime.NewScheme()
    62  		scheme.AddToScheme(k8sNativeScheme)
    63  		// API extensions are not in the above scheme set,
    64  		// and must thus be added separately.
    65  		apiextensionsv1beta1.AddToScheme(k8sNativeScheme)
    66  		apiextensionsv1.AddToScheme(k8sNativeScheme)
    67  	})
    68  	return k8sNativeScheme
    69  }
    70
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