gocage/cmd/console.go

package cmd

import (
	"os"
	"fmt"
	"log"
	"strconv"
	"strings"
	"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 {
		for _, cj := range gJails {
			if strings.EqualFold(cj.Name, args[0]) {
				shellJail(cj)
			}
		}
	}

	fmt.Printf("Jail not found: %s\n", args[0])

	return nil
}

func shellJail(jail Jail) {
	jid := strconv.Itoa(jail.JID)

	err := syscall.Exec("/usr/sbin/jexec", []string{"jexec", jid, "/bin/csh"}, 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
}