ae989d7722
Add support for --container flag, which sets an explicit container name for exec operations. Defaults to `controller`. Signed-off-by: Jacob Henner <code@ventricle.us>
133 lines
4 KiB
Go
133 lines
4 KiB
Go
/*
|
|
Copyright 2019 The Kubernetes 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 kubectl
|
|
|
|
import (
|
|
"bytes"
|
|
"fmt"
|
|
"io"
|
|
"os"
|
|
"os/exec"
|
|
"strings"
|
|
"syscall"
|
|
|
|
apiv1 "k8s.io/api/core/v1"
|
|
"k8s.io/cli-runtime/pkg/genericclioptions"
|
|
)
|
|
|
|
// PodExecString takes a pod and a command, uses kubectl exec to run the command in the pod
|
|
// and returns stdout as a string
|
|
func PodExecString(flags *genericclioptions.ConfigFlags, pod *apiv1.Pod, container string, args []string) (string, error) {
|
|
args = append([]string{"exec", "-n", pod.Namespace, "-c", container, pod.Name}, args...)
|
|
return ExecToString(flags, args)
|
|
}
|
|
|
|
// ExecToString runs a kubectl subcommand and returns stdout as a string
|
|
func ExecToString(flags *genericclioptions.ConfigFlags, args []string) (string, error) {
|
|
kArgs := getKubectlConfigFlags(flags)
|
|
kArgs = append(kArgs, args...)
|
|
|
|
buf := bytes.NewBuffer(make([]byte, 0))
|
|
err := execToWriter(append([]string{"kubectl"}, kArgs...), buf)
|
|
if err != nil {
|
|
return "", err
|
|
}
|
|
return buf.String(), nil
|
|
}
|
|
|
|
// Exec replaces the current process with a kubectl invocation
|
|
func Exec(flags *genericclioptions.ConfigFlags, args []string) error {
|
|
kArgs := getKubectlConfigFlags(flags)
|
|
kArgs = append(kArgs, args...)
|
|
return execCommand(append([]string{"kubectl"}, kArgs...))
|
|
}
|
|
|
|
// Replaces the currently running process with the given command
|
|
func execCommand(args []string) error {
|
|
path, err := exec.LookPath(args[0])
|
|
if err != nil {
|
|
return err
|
|
}
|
|
args[0] = path
|
|
|
|
env := os.Environ()
|
|
return syscall.Exec(path, args, env)
|
|
}
|
|
|
|
// Runs a command and returns stdout
|
|
func execToWriter(args []string, writer io.Writer) error {
|
|
cmd := exec.Command(args[0], args[1:]...)
|
|
|
|
op, err := cmd.StdoutPipe()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
go io.Copy(writer, op)
|
|
err = cmd.Run()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
// getKubectlConfigFlags serializes the parsed flag struct back into a series of command line args
|
|
// that can then be passed to kubectl. The mirror image of
|
|
// https://github.com/kubernetes/cli-runtime/blob/master/pkg/genericclioptions/config_flags.go#L251
|
|
func getKubectlConfigFlags(flags *genericclioptions.ConfigFlags) []string {
|
|
out := []string{}
|
|
o := &out
|
|
|
|
appendStringFlag(o, flags.KubeConfig, "kubeconfig")
|
|
appendStringFlag(o, flags.CacheDir, "cache-dir")
|
|
appendStringFlag(o, flags.CertFile, "client-certificate")
|
|
appendStringFlag(o, flags.KeyFile, "client-key")
|
|
appendStringFlag(o, flags.BearerToken, "token")
|
|
appendStringFlag(o, flags.Impersonate, "as")
|
|
appendStringArrayFlag(o, flags.ImpersonateGroup, "as-group")
|
|
appendStringFlag(o, flags.Username, "username")
|
|
appendStringFlag(o, flags.Password, "password")
|
|
appendStringFlag(o, flags.ClusterName, "cluster")
|
|
appendStringFlag(o, flags.AuthInfoName, "user")
|
|
//appendStringFlag(o, flags.Namespace, "namespace")
|
|
appendStringFlag(o, flags.Context, "context")
|
|
appendStringFlag(o, flags.APIServer, "server")
|
|
appendBoolFlag(o, flags.Insecure, "insecure-skip-tls-verify")
|
|
appendStringFlag(o, flags.CAFile, "certificate-authority")
|
|
appendStringFlag(o, flags.Timeout, "request-timeout")
|
|
|
|
return out
|
|
}
|
|
|
|
func appendStringFlag(out *[]string, in *string, flag string) {
|
|
if in != nil && *in != "" {
|
|
*out = append(*out, fmt.Sprintf("--%v=%v", flag, *in))
|
|
}
|
|
}
|
|
|
|
func appendBoolFlag(out *[]string, in *bool, flag string) {
|
|
if in != nil {
|
|
*out = append(*out, fmt.Sprintf("--%v=%v", flag, *in))
|
|
}
|
|
}
|
|
|
|
func appendStringArrayFlag(out *[]string, in *[]string, flag string) {
|
|
if in != nil && len(*in) > 0 {
|
|
*out = append(*out, fmt.Sprintf("--%v=%v'", flag, strings.Join(*in, ",")))
|
|
}
|
|
}
|