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ns-shell.go
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ns-shell.go
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package mify
import (
"context"
"encoding/base64"
"fmt"
// "os/exec"
"strings"
"sync"
"time"
"github.com/AlecAivazis/survey/v2"
"github.com/mify-io/mify/internal/mify/util"
)
func askForKey(ctx *CliContext) (string, error) {
sshkey := ""
prompt := &survey.Input{
Message: "Paste your public SSH key here",
}
err := survey.AskOne(prompt, &sshkey)
return sshkey, err
}
func decodeKey(ctx *CliContext, key string) (string, bool) {
sshkeyBytes, err := base64.StdEncoding.DecodeString(key)
if err != nil {
return "", false
}
return string(sshkeyBytes), true
}
func getSSHKey(ctx *CliContext) (string, error) {
for {
var sshkey string
if len(ctx.Config.SSHPublicKey) > 0 {
if key, ok := decodeKey(ctx, ctx.Config.SSHPublicKey); ok {
sshkey = key
}
}
var err error
if len(sshkey) == 0 {
sshkey, err = askForKey(ctx)
if err != nil {
return "", err
}
}
res, err := util.NewCommand(ctx.GetCtx(), "ssh-keygen", "-l", "-f", "-").
DisableStdout().
StdinFromString(sshkey).Run()
if err != nil && res.IsOtherError {
return "", fmt.Errorf("failed to verify ssh key: %w", err)
}
if res.ExitCode == 255 {
ctx.Config.SSHPublicKey = ""
continue
}
ctx.Config.SSHPublicKey = base64.StdEncoding.EncodeToString([]byte(sshkey))
return sshkey, nil
}
}
func NsShell(ctx *CliContext, env string, forwardProxy string, listenPort string) error {
sshkey, err := getSSHKey(ctx)
if err != nil {
return err
}
k8sContext, err := getKubeContextName(ctx, env)
if err != nil {
return err
}
goCtx, cancel := context.WithCancel(ctx.GetCtx())
defer cancel()
res, err := util.NewCommand(goCtx,
"kubectl", "--context="+k8sContext,
"get", "pods", "-l", "app=ns-shell",
"-o", "custom-columns=:metadata.name", "--no-headers").StdoutToString().Run()
if err != nil {
return err
}
podName := strings.TrimSpace(res.Stdout)
res, err = util.NewCommand(goCtx,
"kubectl", "--context="+k8sContext,
"exec", podName, "--",
"/bin/sh", "-c",
fmt.Sprintf(
"grep -q -F \"%s\" ~/.ssh/authorized_keys 2>/dev/null || echo \"%s\" >> ~/.ssh/authorized_keys",
sshkey, sshkey),
).StdoutToString().Run()
if err != nil {
return err
}
var wg sync.WaitGroup
var fwdRes util.CommandResult
var fwdErr error
wg.Add(1)
go func() {
defer wg.Done()
fwdRes, fwdErr = util.NewCommand(goCtx,
"kubectl", "--context="+k8sContext,
"port-forward", podName, listenPort+":22",
).DisableStderr().DisableStdout().Run()
}()
attemps := 10
for {
res, err := util.NewCommand(goCtx, "ssh", "-q", "-p", listenPort, "user@localhost", "exit").Run()
if err == nil {
break
}
if res.ExitCode == 255 {
if _, err := util.NewCommand(goCtx, "ssh-keygen", "-R", "[localhost]:"+listenPort).DisableStderr().Run(); err != nil {
return err
}
}
if err != nil && attemps == 0 {
return fmt.Errorf("failed to connect to pod via ssh, please check your public key configuration: %w", err)
}
attemps -= 1
time.Sleep(100 * time.Millisecond)
}
sshArgs := []string{"-p", listenPort}
if forwardProxy != "" {
sshArgs = append(sshArgs, "-L", forwardProxy)
}
fmt.Printf("You can now connect to pod via ssh, run this command to create additional sessions:\n")
fmt.Printf("$ ssh -p %s user@localhost\n", listenPort)
fmt.Printf("============================\n")
sshArgs = append(sshArgs, "user@localhost")
res, err = util.NewCommand(goCtx, "ssh", sshArgs...).Run()
if err != nil && res.IsOtherError {
return err
}
cancel()
wg.Wait()
if fwdErr != nil && fwdRes.IsOtherError {
return fwdErr
}
return nil
}