code: func (ctl *Controller) GetJob(c context.Context, id JobID) (*Job, error) {
  	// Even though we could have made getJob public, we want to force API users
  	// to use Controller as a single facade.
  	return getJob(c, id)
  }
docs: // GetJob fetches a previously launched job given its ID.
  //
  // Returns ErrNoSuchJob if not found. All other possible errors are transient
  // and they are marked as such.