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rsh.go
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rsh.go
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package cmd
import (
"fmt"
"io"
"io/ioutil"
"os"
"strings"
"github.com/jenkins-x/jx/pkg/log"
"github.com/pkg/errors"
"github.com/spf13/cobra"
"gopkg.in/AlecAivazis/survey.v1/terminal"
"github.com/jenkins-x/jx/pkg/jx/cmd/templates"
"github.com/jenkins-x/jx/pkg/kube"
"github.com/jenkins-x/jx/pkg/util"
corev1 "k8s.io/api/core/v1"
)
const (
DefaultShell = "/bin/sh"
ShellsFile = "/etc/shells"
defaultRshCommand = "bash"
)
type RshOptions struct {
CommonOptions
Container string
Namespace string
Pod string
Executable string
ExecCmd string
DevPod bool
Username string
Environment string
stopCh chan struct{}
}
var (
rsh_long = templates.LongDesc(`
Opens a terminal or runs a command in a pods container
`)
rsh_example = templates.Examples(`
# Open a terminal in the first container of the foo deployment's latest pod
jx rsh foo
# Opens a terminal in the cheese container in the latest pod in the foo deployment
jx rsh -c cheese foo
# To connect to one of your DevPods use:
jx rsh -d
# To execute something in the remote shell (like classic rsh or ssh commands)
jx rsh -e 'do something'
`)
)
func NewCmdRsh(f Factory, in terminal.FileReader, out terminal.FileWriter, errOut io.Writer) *cobra.Command {
options := &RshOptions{
CommonOptions: CommonOptions{
Factory: f,
In: in,
Out: out,
Err: errOut,
},
}
cmd := &cobra.Command{
Use: "rsh [deploymentOrPodName]",
Short: "Opens a terminal in a pod or runs a command in the pod",
Long: rsh_long,
Example: rsh_example,
Aliases: []string{"log"},
Run: func(cmd *cobra.Command, args []string) {
options.Cmd = cmd
options.Args = args
err := options.Run()
CheckErr(err)
},
}
cmd.Flags().StringVarP(&options.Container, "container", "c", "", "The name of the container to log")
cmd.Flags().StringVarP(&options.Namespace, "namespace", "n", "", "the namespace to look for the Deployment. Defaults to the current namespace")
cmd.Flags().StringVarP(&options.Namespace, "pod", "p", "", "the pod name to use")
cmd.Flags().StringVarP(&options.Executable, "shell", "s", "", "Path to the shell command")
cmd.Flags().BoolVarP(&options.DevPod, "devpod", "d", false, "Connect to a DevPod")
cmd.Flags().StringVarP(&options.ExecCmd, "execute", "e", defaultRshCommand, "Execute this command on the remote container")
cmd.Flags().StringVarP(&options.Username, "username", "", "", "The username to create the DevPod. If not specified defaults to the current operating system user or $USER'")
cmd.Flags().StringVarP(&options.Environment, "environment", "", "", "The environment in which to look for the Deployment. Defaults to the current environment")
return cmd
}
func (o *RshOptions) Run() error {
args := o.Args
client, curNs, err := o.KubeClient()
if err != nil {
return err
}
ns := o.Namespace
if ns == "" {
ns = curNs
}
if o.Environment != "" {
ns, err = o.findEnvironmentNamespace(o.Environment)
if err != nil {
return err
}
}
if o.ExecCmd == "" {
o.ExecCmd = defaultRshCommand
}
filter := ""
names := []string{}
podsName := "Pods"
pods := map[string]*corev1.Pod{}
if o.DevPod {
podsName = "DevPods"
userName, err := o.getUsername(o.Username)
if err != nil {
return err
}
names, pods, err = kube.GetDevPodNames(client, ns, userName)
if err != nil {
return err
}
} else {
names, err = kube.GetPodNames(client, ns, "")
if err != nil {
return err
}
}
if len(names) == 0 {
if filter == "" {
return fmt.Errorf("There are no %s", podsName)
} else {
return fmt.Errorf("There are no %s matching filter: %s", podsName, filter)
}
}
name := o.Pod
if len(args) == 0 {
if util.StringArrayIndex(names, name) < 0 {
n, err := util.PickName(names, "Pick Pod:", o.In, o.Out, o.Err)
if err != nil {
return err
}
name = n
}
} else {
name = args[0]
if util.StringArrayIndex(names, name) < 0 {
// lets try use the name as a filter
filteredNames := []string{}
for _, n := range names {
if strings.Contains(n, name) {
filteredNames = append(filteredNames, n)
}
}
n, err := util.PickName(filteredNames, "Pick Pod:", o.In, o.Out, o.Err)
if err != nil {
return err
}
name = n
}
}
if name == "" {
return fmt.Errorf("No pod found for namespace %s with name %s", ns, name)
}
commandArguments := []string{}
if o.Executable == "" {
if o.DevPod {
workingDir := ""
pod := pods[name]
if pod != nil && pod.Annotations != nil {
workingDir = pod.Annotations[kube.AnnotationWorkingDir]
}
if workingDir != "" {
commandArguments = []string{"--", "/bin/sh", "-c", "mkdir -p " + workingDir + "\ncd " + workingDir + "\n" + o.ExecCmd}
} else {
commandArguments = []string{"--", "/bin/sh", "-c", o.ExecCmd}
}
} else {
bash, err := o.detectBash(ns, name, o.Container)
if err != nil {
if o.ExecCmd != "" {
if o.ExecCmd == "bash" {
commandArguments = []string{DefaultShell}
} else {
commandArguments = []string{DefaultShell, "-c", o.ExecCmd}
}
} else {
commandArguments = []string{DefaultShell}
}
} else {
if o.ExecCmd != "" {
if o.ExecCmd == "bash" {
commandArguments = []string{bash}
} else {
commandArguments = []string{"--", bash, "-c", o.ExecCmd}
}
} else {
commandArguments = []string{bash}
}
}
}
}
if len(commandArguments) == 0 {
commandArguments = []string{o.Executable}
}
a := []string{"exec", "-it", "-n", ns}
if o.Container != "" {
a = append(a, "-c", o.Container)
}
a = append(a, name)
if len(args) > 1 {
a = append(a, args[1:]...)
} else if len(commandArguments) > 0 {
a = append(a, commandArguments...)
}
if o.Verbose {
log.Infof("Running command: kubectl %s\n", strings.Join(a, " "))
}
return o.runCommandInteractive(true, "kubectl", a...)
}
func (o *RshOptions) detectBash(ns string, podName string, container string) (string, error) {
fileName := "/tmp/pod_" + podName + "_shells"
args := []string{"cp", ns + "/" + podName + ":" + ShellsFile, fileName}
if container != "" {
args = append(args, "-c", container)
}
err := o.runCommandQuietly("kubectl", args...)
if err != nil {
return "", errors.Wrapf(err, "failed to copy the shell file form POD '%s'", podName)
}
defer os.Remove(fileName)
content, err := ioutil.ReadFile(fileName)
if err != nil {
return "", errors.Wrap(err, "failed to read the copied shell")
}
lines := strings.Split(string(content), "\n")
for _, line := range lines {
if strings.HasSuffix(line, "bash") {
return line, nil
}
}
return "", fmt.Errorf("no bash found in POD '%s'", podName)
}