os/cmd/control/recovery_init.go

package control

import (
	"os"
	"os/exec"
	"syscall"

	log "github.com/Sirupsen/logrus"
	"github.com/codegangsta/cli"
)

func recoveryInitAction(c *cli.Context) error {
	if err := writeRespawn("root", false); err != nil {
		log.Error(err)
	}

	os.Setenv("TERM", "linux")
	os.Setenv("PS1", `[Recovery Console: \l \u@\h \W]\$`)

	respawnBinPath, err := exec.LookPath("respawn")
	if err != nil {
		return err
	}

	return syscall.Exec(respawnBinPath, []string{"respawn", "-f", "/etc/respawn.conf"}, os.Environ())
}