96 lines
3 KiB
Go
96 lines
3 KiB
Go
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/*
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Copyright 2017 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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"flag"
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"fmt"
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"os"
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"os/user"
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"path/filepath"
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"k8s.io/client-go/rest"
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"k8s.io/client-go/tools/clientcmd"
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logf "sigs.k8s.io/controller-runtime/pkg/runtime/log"
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)
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var (
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kubeconfig, masterURL string
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log = logf.KBLog.WithName("client").WithName("config")
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)
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func init() {
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// TODO: Fix this to allow double vendoring this library but still register flags on behalf of users
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flag.StringVar(&kubeconfig, "kubeconfig", "",
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"Paths to a kubeconfig. Only required if out-of-cluster.")
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flag.StringVar(&masterURL, "master", "",
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"The address of the Kubernetes API server. Overrides any value in kubeconfig. "+
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"Only required if out-of-cluster.")
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}
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// GetConfig creates a *rest.Config for talking to a Kubernetes apiserver.
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// If --kubeconfig is set, will use the kubeconfig file at that location. Otherwise will assume running
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// in cluster and use the cluster provided kubeconfig.
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//
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// Config precedence
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//
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// * --kubeconfig flag pointing at a file
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//
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// * KUBECONFIG environment variable pointing at a file
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//
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// * In-cluster config if running in cluster
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//
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// * $HOME/.kube/config if exists
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func GetConfig() (*rest.Config, error) {
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// If a flag is specified with the config location, use that
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if len(kubeconfig) > 0 {
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return clientcmd.BuildConfigFromFlags(masterURL, kubeconfig)
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}
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// If an env variable is specified with the config locaiton, use that
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if len(os.Getenv("KUBECONFIG")) > 0 {
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return clientcmd.BuildConfigFromFlags(masterURL, os.Getenv("KUBECONFIG"))
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}
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// If no explicit location, try the in-cluster config
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if c, err := rest.InClusterConfig(); err == nil {
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return c, nil
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}
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// If no in-cluster config, try the default location in the user's home directory
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if usr, err := user.Current(); err == nil {
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if c, err := clientcmd.BuildConfigFromFlags(
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"", filepath.Join(usr.HomeDir, ".kube", "config")); err == nil {
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return c, nil
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}
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}
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return nil, fmt.Errorf("could not locate a kubeconfig")
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}
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// GetConfigOrDie creates a *rest.Config for talking to a Kubernetes apiserver.
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// If --kubeconfig is set, will use the kubeconfig file at that location. Otherwise will assume running
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// in cluster and use the cluster provided kubeconfig.
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//
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// Will log an error and exit if there is an error creating the rest.Config.
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func GetConfigOrDie() *rest.Config {
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config, err := GetConfig()
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if err != nil {
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log.Error(err, "unable to get kubeconfig")
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os.Exit(1)
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}
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return config
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}
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