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kubeconfig.go
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kubeconfig.go
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/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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 test
import (
"fmt"
"os"
"k8s.io/client-go/tools/clientcmd"
clientcmdapi "k8s.io/client-go/tools/clientcmd/api"
)
const (
tempKubeEnvConfig = "/tmp/.kube/config"
)
// OverrideDefaultKubeConfigEmptyContext same as OverrideDefaultKubeConfigWithNamespace, but sets default namespace to "default"
func OverrideDefaultKubeConfigEmptyContext() (kubeconfigfile string, rollbackEnvOverride func()) {
return OverrideDefaultKubeConfigWithNamespace("default")
}
// OverrideDefaultKubeConfigWithNamespace overrides the env var variable meant to point to the kube config file with a temporary file to be used in tests
// You must call defer with rollbackEnvOverride func to switch back to the original value and not jeopardize the local configuration
func OverrideDefaultKubeConfigWithNamespace(namespace string) (kubeconfigfile string, rollbackEnvOverride func()) {
defaultConfig := clientcmdapi.NewConfig()
defaultConfig.CurrentContext = namespace + "/cluster:8080/user"
defaultConfig.Contexts[defaultConfig.CurrentContext] = clientcmdapi.NewContext()
defaultConfig.Contexts[defaultConfig.CurrentContext].Namespace = namespace
defaultConfig.Contexts[defaultConfig.CurrentContext].Cluster = "cluster:8080"
defaultConfig.Contexts[defaultConfig.CurrentContext].AuthInfo = "user"
if err := clientcmd.WriteToFile(*defaultConfig, tempKubeEnvConfig); err != nil {
panic(fmt.Errorf("Impossible to write default kubeclient config: %s ", err))
}
return OverrideDefaultKubeConfig()
}
// OverrideDefaultKubeConfig overrides the default KUBECONFIG env var to point to a temporary file, does not create any context.
func OverrideDefaultKubeConfig() (kubeconfigfile string, rollbackEnvOverride func()) {
oldEnvVar := os.Getenv(clientcmd.RecommendedConfigPathEnvVar)
os.Setenv(clientcmd.RecommendedConfigPathEnvVar, tempKubeEnvConfig)
return tempKubeEnvConfig, func() {
if err := os.Remove(tempKubeEnvConfig); err != nil {
if !os.IsNotExist(err) {
panic(fmt.Errorf("Impossible to remove file %s: %s ", tempKubeEnvConfig, err))
}
}
os.Setenv(clientcmd.RecommendedConfigPathEnvVar, oldEnvVar)
}
}