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config.go
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config.go
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// Copyright 2017 Istio 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 kube
import (
"os"
"k8s.io/client-go/kubernetes"
"k8s.io/client-go/rest"
"k8s.io/client-go/tools/clientcmd"
clientcmdapi "k8s.io/client-go/tools/clientcmd/api"
)
// BuildClientConfig is a helper function that builds client config from a kubeconfig filepath.
// It overrides the current context with the one provided (empty to use default).
//
// This is a modified version of k8s.io/client-go/tools/clientcmd/BuildConfigFromFlags with the
// difference that it loads default configs if not running in-cluster.
func BuildClientConfig(kubeconfig, context string) (*rest.Config, error) {
if kubeconfig != "" {
info, err := os.Stat(kubeconfig)
if err != nil || info.Size() == 0 {
// If the specified kubeconfig doesn't exists / empty file / any other error
// from file stat, fall back to default
kubeconfig = ""
}
}
//Config loading rules:
// 1. kubeconfig if it not empty string
// 2. In cluster config if running in-cluster
// 3. Config(s) in KUBECONFIG environment variable
// 4. Use $HOME/.kube/config
loadingRules := clientcmd.NewDefaultClientConfigLoadingRules()
loadingRules.DefaultClientConfig = &clientcmd.DefaultClientConfig
loadingRules.ExplicitPath = kubeconfig
configOverrides := &clientcmd.ConfigOverrides{
ClusterDefaults: clientcmd.ClusterDefaults,
CurrentContext: context,
}
return clientcmd.NewNonInteractiveDeferredLoadingClientConfig(loadingRules, configOverrides).ClientConfig()
}
// CreateClientset is a helper function that builds a kubernetes Clienset from a kubeconfig
// filepath. See `BuildClientConfig` for kubeconfig loading rules.
func CreateClientset(kubeconfig, context string) (*kubernetes.Clientset, error) {
c, err := BuildClientConfig(kubeconfig, context)
if err != nil {
return nil, err
}
return kubernetes.NewForConfig(c)
}
// CreateInterfaceFromClusterConfig is a helper function to create Kubernetes interface from in memory cluster config struct
func CreateInterfaceFromClusterConfig(clusterConfig *clientcmdapi.Config) (kubernetes.Interface, error) {
return createInterface(clusterConfig)
}
// createInterface is new function which creates rest config and kubernetes interface
// from passed cluster's config struct
func createInterface(clusterConfig *clientcmdapi.Config) (kubernetes.Interface, error) {
clientConfig := clientcmd.NewDefaultClientConfig(*clusterConfig, &clientcmd.ConfigOverrides{})
rest, err := clientConfig.ClientConfig()
if err != nil {
return nil, err
}
return kubernetes.NewForConfig(rest)
}