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option.go
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option.go
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// Copyright 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 cli
import (
"github.com/spf13/pflag"
"github.com/spf13/viper"
v1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/client-go/tools/clientcmd"
"istio.io/istio/pkg/ptr"
)
const (
FlagKubeConfig = "kubeconfig"
FlagContext = "context"
FlagNamespace = "namespace"
FlagIstioNamespace = "istioNamespace"
)
type RootFlags struct {
kubeconfig *string
configContext *string
namespace *string
istioNamespace *string
defaultNamespace string
}
func AddRootFlags(flags *pflag.FlagSet) *RootFlags {
r := &RootFlags{
kubeconfig: ptr.Of[string](""),
configContext: ptr.Of[string](""),
namespace: ptr.Of[string](""),
istioNamespace: ptr.Of[string](""),
}
flags.StringVarP(r.kubeconfig, FlagKubeConfig, "c", "",
"Kubernetes configuration file")
flags.StringVar(r.configContext, FlagContext, "",
"Kubernetes configuration context")
flags.StringVarP(r.namespace, FlagNamespace, "n", v1.NamespaceAll,
"Kubernetes namespace")
flags.StringVarP(r.istioNamespace, FlagIstioNamespace, "i", viper.GetString(FlagIstioNamespace),
"Istio system namespace")
return r
}
// Namespace returns the namespace flag value.
func (r *RootFlags) Namespace() string {
return *r.namespace
}
// IstioNamespace returns the istioNamespace flag value.
func (r *RootFlags) IstioNamespace() string {
return *r.istioNamespace
}
// DefaultNamespace returns the default namespace to use.
func (r *RootFlags) DefaultNamespace() string {
if r.defaultNamespace == "" {
r.configureDefaultNamespace()
}
return r.defaultNamespace
}
func (r *RootFlags) configureDefaultNamespace() {
configAccess := clientcmd.NewDefaultPathOptions()
kubeconfig := *r.kubeconfig
if kubeconfig != "" {
// use specified kubeconfig file for the location of the
// config to read
configAccess.GlobalFile = kubeconfig
}
// gets existing kubeconfig or returns new empty config
config, err := configAccess.GetStartingConfig()
if err != nil {
r.defaultNamespace = v1.NamespaceDefault
return
}
// If a specific context was specified, use that. Otherwise, just use the current context from the kube config.
selectedContext := config.CurrentContext
if *r.configContext != "" {
selectedContext = *r.configContext
}
// Use the namespace associated with the selected context as default, if the context has one
context, ok := config.Contexts[selectedContext]
if !ok {
r.defaultNamespace = v1.NamespaceDefault
return
}
if context.Namespace == "" {
r.defaultNamespace = v1.NamespaceDefault
return
}
r.defaultNamespace = context.Namespace
}