mirror of https://github.com/k3s-io/k3s
95 lines
3.1 KiB
Go
95 lines
3.1 KiB
Go
/*
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Copyright 2018 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package options
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import (
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"fmt"
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"io/ioutil"
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"os"
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"k8s.io/klog"
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"k8s.io/apimachinery/pkg/runtime"
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"k8s.io/component-base/codec"
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kubeschedulerconfig "k8s.io/kubernetes/pkg/scheduler/apis/config"
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kubeschedulerscheme "k8s.io/kubernetes/pkg/scheduler/apis/config/scheme"
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kubeschedulerconfigv1alpha1 "k8s.io/kubernetes/pkg/scheduler/apis/config/v1alpha1"
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kubeschedulerconfigv1alpha2 "k8s.io/kubernetes/pkg/scheduler/apis/config/v1alpha2"
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)
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func loadConfigFromFile(file string) (*kubeschedulerconfig.KubeSchedulerConfiguration, error) {
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data, err := ioutil.ReadFile(file)
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if err != nil {
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return nil, err
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}
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return loadConfig(data)
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}
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func loadConfig(data []byte) (*kubeschedulerconfig.KubeSchedulerConfiguration, error) {
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// The UniversalDecoder runs defaulting and returns the internal type by default.
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obj, gvk, err := kubeschedulerscheme.Codecs.UniversalDecoder().Decode(data, nil, nil)
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if err != nil {
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// Try strict decoding first. If that fails decode with a lenient
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// decoder, which has only v1alpha1 registered, and log a warning.
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// The lenient path is to be dropped when support for v1alpha1 is dropped.
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if !runtime.IsStrictDecodingError(err) {
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return nil, err
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}
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var lenientErr error
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_, lenientCodecs, lenientErr := codec.NewLenientSchemeAndCodecs(
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kubeschedulerconfig.AddToScheme,
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kubeschedulerconfigv1alpha1.AddToScheme,
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)
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if lenientErr != nil {
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return nil, lenientErr
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}
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obj, gvk, lenientErr = lenientCodecs.UniversalDecoder().Decode(data, nil, nil)
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if lenientErr != nil {
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return nil, err
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}
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klog.Warningf("using lenient decoding as strict decoding failed: %v", err)
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}
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if cfgObj, ok := obj.(*kubeschedulerconfig.KubeSchedulerConfiguration); ok {
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return cfgObj, nil
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}
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return nil, fmt.Errorf("couldn't decode as KubeSchedulerConfiguration, got %s: ", gvk)
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}
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// WriteConfigFile writes the config into the given file name as YAML.
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func WriteConfigFile(fileName string, cfg *kubeschedulerconfig.KubeSchedulerConfiguration) error {
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const mediaType = runtime.ContentTypeYAML
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info, ok := runtime.SerializerInfoForMediaType(kubeschedulerscheme.Codecs.SupportedMediaTypes(), mediaType)
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if !ok {
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return fmt.Errorf("unable to locate encoder -- %q is not a supported media type", mediaType)
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}
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encoder := kubeschedulerscheme.Codecs.EncoderForVersion(info.Serializer, kubeschedulerconfigv1alpha2.SchemeGroupVersion)
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configFile, err := os.Create(fileName)
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if err != nil {
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return err
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}
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defer configFile.Close()
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if err := encoder.Encode(cfg, configFile); err != nil {
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return err
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}
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return nil
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}
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