66 lines
2.8 KiB
Go
66 lines
2.8 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 config
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import (
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"fmt"
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"io"
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"io/ioutil"
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apierrors "k8s.io/apimachinery/pkg/api/errors"
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metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
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clientset "k8s.io/client-go/kubernetes"
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kubeadmapi "k8s.io/kubernetes/cmd/kubeadm/app/apis/kubeadm"
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"k8s.io/kubernetes/cmd/kubeadm/app/constants"
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)
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// TODO: Add unit tests for this file
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// FetchConfigFromFileOrCluster fetches configuration required for upgrading your cluster from a file (which has precedence) or a ConfigMap in the cluster
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func FetchConfigFromFileOrCluster(client clientset.Interface, w io.Writer, logPrefix, cfgPath string) (*kubeadmapi.MasterConfiguration, error) {
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// Load the configuration from a file or the cluster
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configBytes, err := loadConfigurationBytes(client, w, logPrefix, cfgPath)
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if err != nil {
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return nil, err
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}
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// Take the versioned configuration populated from the file or ConfigMap, convert it to internal, default and validate
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return BytesToInternalConfig(configBytes)
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}
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// loadConfigurationBytes loads the configuration byte slice from either a file or the cluster ConfigMap
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func loadConfigurationBytes(client clientset.Interface, w io.Writer, logPrefix, cfgPath string) ([]byte, error) {
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// The config file has the highest priority
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if cfgPath != "" {
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fmt.Fprintf(w, "[%s] Reading configuration options from a file: %s\n", logPrefix, cfgPath)
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return ioutil.ReadFile(cfgPath)
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}
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fmt.Fprintf(w, "[%s] Reading configuration from the cluster...\n", logPrefix)
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configMap, err := client.CoreV1().ConfigMaps(metav1.NamespaceSystem).Get(constants.MasterConfigurationConfigMap, metav1.GetOptions{})
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if apierrors.IsNotFound(err) {
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// Return the apierror directly so the caller of this function can know what type of error occurred and act based on that
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return []byte{}, err
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} else if err != nil {
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return []byte{}, fmt.Errorf("an unexpected error happened when trying to get the ConfigMap %q in the %s namespace: %v", constants.MasterConfigurationConfigMap, metav1.NamespaceSystem, err)
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}
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fmt.Fprintf(w, "[%s] FYI: You can look at this config file with 'kubectl -n %s get cm %s -oyaml'\n", logPrefix, metav1.NamespaceSystem, constants.MasterConfigurationConfigMap)
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return []byte(configMap.Data[constants.MasterConfigurationConfigMapKey]), nil
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}
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