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kubecli.go
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kubecli.go
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/*
* This file is part of the KubeVirt project
*
* 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.
*
* Copyright 2018 Red Hat, Inc.
* Copyright 2018 The Kubernetes Authors.
*
*/
package kubecli
import (
"flag"
"k8s.io/apimachinery/pkg/runtime"
"k8s.io/apimachinery/pkg/runtime/serializer"
"k8s.io/client-go/kubernetes"
"k8s.io/client-go/kubernetes/scheme"
"k8s.io/client-go/rest"
restclient "k8s.io/client-go/rest"
"k8s.io/client-go/tools/clientcmd"
"os"
"github.com/spf13/pflag"
"kubevirt.io/kubevirt/pkg/api/v1"
)
var (
kubeconfig string
master string
)
func init() {
flag.StringVar(&kubeconfig, "kubeconfig", "", "absolute path to the kubeconfig file")
flag.StringVar(&master, "master", "", "master url")
}
func GetKubevirtSubresourceClientFromFlags(master string, kubeconfig string) (KubevirtClient, error) {
config, err := clientcmd.BuildConfigFromFlags(master, kubeconfig)
if err != nil {
return nil, err
}
config.GroupVersion = &v1.SubresourceGroupVersion
config.NegotiatedSerializer = serializer.DirectCodecFactory{CodecFactory: scheme.Codecs}
config.APIPath = "/apis"
config.ContentType = runtime.ContentTypeJSON
restClient, err := rest.RESTClientFor(config)
if err != nil {
return nil, err
}
coreClient, err := kubernetes.NewForConfig(config)
if err != nil {
return nil, err
}
return &kubevirt{master, kubeconfig, restClient, config, coreClient}, nil
}
// DefaultClientConfig creates a clientcmd.ClientConfig with the following hierarchy:
// 1. Use the kubeconfig builder. The number of merges and overrides here gets a little crazy. Stay with me.
// 1. Merge the kubeconfig itself. This is done with the following hierarchy rules:
// 1. CommandLineLocation - this parsed from the command line, so it must be late bound. If you specify this,
// then no other kubeconfig files are merged. This file must exist.
// 2. If $KUBECONFIG is set, then it is treated as a list of files that should be merged.
// 3. HomeDirectoryLocation
// Empty filenames are ignored. Files with non-deserializable content produced errors.
// The first file to set a particular value or map key wins and the value or map key is never changed.
// This means that the first file to set CurrentContext will have its context preserved. It also means
// that if two files specify a "red-user", only values from the first file's red-user are used. Even
// non-conflicting entries from the second file's "red-user" are discarded.
// 2. Determine the context to use based on the first hit in this chain
// 1. command line argument - again, parsed from the command line, so it must be late bound
// 2. CurrentContext from the merged kubeconfig file
// 3. Empty is allowed at this stage
// 3. Determine the cluster info and auth info to use. At this point, we may or may not have a context. They
// are built based on the first hit in this chain. (run it twice, once for auth, once for cluster)
// 1. command line argument
// 2. If context is present, then use the context value
// 3. Empty is allowed
// 4. Determine the actual cluster info to use. At this point, we may or may not have a cluster info. Build
// each piece of the cluster info based on the chain:
// 1. command line argument
// 2. If cluster info is present and a value for the attribute is present, use it.
// 3. If you don't have a server location, bail.
// 5. Auth info is build using the same rules as cluster info, EXCEPT that you can only have one authentication
// technique per auth info. The following conditions result in an error:
// 1. If there are two conflicting techniques specified from the command line, fail.
// 2. If the command line does not specify one, and the auth info has conflicting techniques, fail.
// 3. If the command line specifies one and the auth info specifies another, honor the command line technique.
// 2. Use default values and potentially prompt for auth information
//
// However, if it appears that we're running in a kubernetes cluster
// container environment, then run with the auth info kubernetes mounted for
// us. Specifically:
// The env vars KUBERNETES_SERVICE_HOST and KUBERNETES_SERVICE_PORT are
// set, and the file /var/run/secrets/kubernetes.io/serviceaccount/token
// exists and is not a directory.
// Initially copied from https://github.com/kubernetes/kubernetes/blob/09f321c80bfc9bca63a5530b56d7a1a3ba80ba9b/pkg/kubectl/cmd/util/factory_client_access.go#L174
func DefaultClientConfig(flags *pflag.FlagSet) clientcmd.ClientConfig {
loadingRules := clientcmd.NewDefaultClientConfigLoadingRules()
// use the standard defaults for this client command
// DEPRECATED: remove and replace with something more accurate
loadingRules.DefaultClientConfig = &clientcmd.DefaultClientConfig
flags.StringVar(&loadingRules.ExplicitPath, "kubeconfig", "", "Path to the kubeconfig file to use for CLI requests.")
overrides := &clientcmd.ConfigOverrides{ClusterDefaults: clientcmd.ClusterDefaults}
flagNames := clientcmd.RecommendedConfigOverrideFlags("")
// short flagnames are disabled by default. These are here for compatibility with existing scripts
flagNames.ClusterOverrideFlags.APIServer.ShortName = "s"
clientcmd.BindOverrideFlags(overrides, flags, flagNames)
clientConfig := clientcmd.NewInteractiveDeferredLoadingClientConfig(loadingRules, overrides, os.Stdin)
return clientConfig
}
// this function is defined as a closure so iut could be overwritten by unit tests
var GetKubevirtClientFromClientConfig = func(cmdConfig clientcmd.ClientConfig) (KubevirtClient, error) {
config, err := cmdConfig.ClientConfig()
if err != nil {
return nil, err
}
return GetKubevirtClientFromRESTConfig(config)
}
func GetKubevirtClientFromRESTConfig(config *rest.Config) (KubevirtClient, error) {
config.GroupVersion = &v1.GroupVersion
config.NegotiatedSerializer = serializer.DirectCodecFactory{CodecFactory: scheme.Codecs}
config.APIPath = "/apis"
config.ContentType = runtime.ContentTypeJSON
restClient, err := rest.RESTClientFor(config)
if err != nil {
return nil, err
}
coreClient, err := kubernetes.NewForConfig(config)
if err != nil {
return nil, err
}
return &kubevirt{master, kubeconfig, restClient, config, coreClient}, nil
}
func GetKubevirtClientFromFlags(master string, kubeconfig string) (KubevirtClient, error) {
config, err := clientcmd.BuildConfigFromFlags(master, kubeconfig)
if err != nil {
return nil, err
}
return GetKubevirtClientFromRESTConfig(config)
}
func GetKubevirtClient() (KubevirtClient, error) {
return GetKubevirtClientFromFlags(master, kubeconfig)
}
func GetKubevirtSubresourceClient() (KubevirtClient, error) {
return GetKubevirtSubresourceClientFromFlags(master, kubeconfig)
}
func GetConfig() (*restclient.Config, error) {
return clientcmd.BuildConfigFromFlags(master, kubeconfig)
}
func GetKubevirtClientConfig() (*rest.Config, error) {
config, err := clientcmd.BuildConfigFromFlags(master, kubeconfig)
if err != nil {
return nil, err
}
return config, nil
}