gocage/cmd/console.go

package cmd

import (
	"os"
	"fmt"
	"log"
	"errors"
	"strconv"
	"syscall"
)

func ShellJail(args []string) error {
	// We cant shell more than one jail bc we replace gocage execution with jexec, so there wont be no return to gocage
	if len(args) > 0 {
		cj, err := getJailFromArray(args[0], []string{"basejail", "jail"}, gJails)
		if err != nil {
			fmt.Printf("Error getting jail %s: %v\n", args[0], err)
			return err
		}
		if err := shellJail(cj); err != nil {
			fmt.Printf("%v\n", err)
			return err
		}
	}
	
	return nil
}

func shellJail(jail *Jail) error {
	if false == jail.Running {
		return errors.New("Jail is not running")
	}

	jid := strconv.Itoa(jail.JID)

	err := syscall.Exec("/usr/sbin/jexec", []string{"jexec", jid, "login", "-f", "root"}, os.Environ())

	// We should never get here, as syscall.Exec replace the gocage binary execution with jexec
	// This means the moment syscall.Exec fires, gocage execution halt.
	if err != nil {
		log.Printf("Exec returned %v\n", err)
	}

	return nil
}