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kanctl.go
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kanctl.go
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// Copyright 2019 The Kanister 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 kanctl
import (
"os"
"github.com/pkg/errors"
"github.com/spf13/cobra"
"k8s.io/client-go/kubernetes"
"github.com/kanisterio/kanister/pkg/client/clientset/versioned"
"github.com/kanisterio/kanister/pkg/kube"
"github.com/kanisterio/kanister/pkg/log"
"github.com/kanisterio/kanister/pkg/version"
osversioned "github.com/openshift/client-go/apps/clientset/versioned"
)
const (
namespaceFlagName = "namespace"
verboseFlagName = "verbose"
)
var (
// Verbose indicates whether verbose output should be displayed
Verbose bool
)
// Execute adds all child commands to the root command and sets flags appropriately.
// This is called by main.main(). It only needs to happen once to the rootCmd.
func Execute() {
root := newRootCommand()
if err := root.Execute(); err != nil {
if Verbose {
log.WithError(err).Print("Kanctl failed to execute")
}
os.Exit(1)
}
}
func newRootCommand() *cobra.Command {
// RootCmd represents the base command when called without any subcommands
rootCmd := &cobra.Command{
Use: "kanctl [common options...] <command>",
Short: "A set of helpers to help with management of Kanister custom resources",
Version: version.VersionString(),
}
rootCmd.PersistentFlags().StringP(namespaceFlagName, "n", "", "Override namespace obtained from kubectl context")
rootCmd.PersistentFlags().BoolVar(&Verbose, verboseFlagName, false, "Display verbose output")
rootCmd.AddCommand(newValidateCommand())
rootCmd.AddCommand(newCreateCommand())
return rootCmd
}
func resolveNamespace(cmd *cobra.Command) (string, error) {
if ns := cmd.Flag(namespaceFlagName).Value.String(); ns != "" {
return ns, nil
}
return kube.ConfigNamespace()
}
func initializeClients() (kubernetes.Interface, versioned.Interface, osversioned.Interface, error) {
config, err := kube.LoadConfig()
if err != nil {
return nil, nil, nil, err
}
cli, err := kubernetes.NewForConfig(config)
if err != nil {
return nil, nil, nil, errors.Wrap(err, "could not get the kubernetes client")
}
osCli, err := osversioned.NewForConfig(config)
if err != nil {
return nil, nil, nil, errors.Wrapf(err, "could not get openshift client")
}
crCli, err := versioned.NewForConfig(config)
if err != nil {
return nil, nil, nil, errors.Wrap(err, "could not get the CRD client")
}
return cli, crCli, osCli, nil
}