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exec.go
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exec.go
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/*
Copyright 2014 The Kubernetes Authors All rights reserved.
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.
This file was modified by James Munnelly (https://gitlab.com/u/munnerz)
*/
package kubernetes
import (
"fmt"
"io"
"net/url"
log "github.com/Sirupsen/logrus"
"k8s.io/kubernetes/pkg/api"
"k8s.io/kubernetes/pkg/client/restclient"
client "k8s.io/kubernetes/pkg/client/unversioned"
"k8s.io/kubernetes/pkg/client/unversioned/remotecommand"
remotecommandserver "k8s.io/kubernetes/pkg/kubelet/server/remotecommand"
)
// RemoteExecutor defines the interface accepted by the Exec command - provided for test stubbing
type RemoteExecutor interface {
Execute(method string, url *url.URL, config *restclient.Config, stdin io.Reader, stdout, stderr io.Writer, tty bool) error
}
// DefaultRemoteExecutor is the standard implementation of remote command execution
type DefaultRemoteExecutor struct{}
func (*DefaultRemoteExecutor) Execute(method string, url *url.URL, config *restclient.Config, stdin io.Reader, stdout, stderr io.Writer, tty bool) error {
exec, err := remotecommand.NewExecutor(config, method, url)
if err != nil {
return err
}
return exec.Stream(remotecommandserver.SupportedStreamingProtocols, stdin, stdout, stderr, tty)
}
// ExecOptions declare the arguments accepted by the Exec command
type ExecOptions struct {
Namespace string
PodName string
ContainerName string
Stdin bool
Command []string
In io.Reader
Out io.Writer
Err io.Writer
Executor RemoteExecutor
Client *client.Client
Config *restclient.Config
}
// Run executes a validated remote execution against a pod.
func (p *ExecOptions) Run() error {
pod, err := p.Client.Pods(p.Namespace).Get(p.PodName)
if err != nil {
return err
}
if pod.Status.Phase != api.PodRunning {
return fmt.Errorf("pod %s is not running and cannot execute commands; current phase is %s", p.PodName, pod.Status.Phase)
}
containerName := p.ContainerName
if len(containerName) == 0 {
log.Infof("defaulting container name to %s", pod.Spec.Containers[0].Name)
containerName = pod.Spec.Containers[0].Name
}
// TODO: refactor with terminal helpers from the edit utility once that is merged
var stdin io.Reader
if p.Stdin {
stdin = p.In
}
// TODO: consider abstracting into a client invocation or client helper
req := p.Client.RESTClient.Post().
Resource("pods").
Name(pod.Name).
Namespace(pod.Namespace).
SubResource("exec").
Param("container", containerName)
req.VersionedParams(&api.PodExecOptions{
Container: containerName,
Command: p.Command,
Stdin: stdin != nil,
Stdout: p.Out != nil,
Stderr: p.Err != nil,
}, api.ParameterCodec)
return p.Executor.Execute("POST", req.URL(), p.Config, stdin, p.Out, p.Err, false)
}