drivers/google/google.go
func (d *Driver) GetState() (state.State, error) {
	c, err := newComputeUtil(d)
	if err != nil {
		return state.None, err
	}

	// All we care about is whether the disk exists, so we just check disk for a nil value.
	// There will be no error if disk is not nil.
	instance, _ := c.instance()
	if instance == nil {
		disk, _ := c.disk()
		if disk == nil {
			return state.None, nil
		}
		return state.Stopped, nil
	}

	switch instance.Status {
	case "PROVISIONING", "STAGING":
		return state.Starting, nil
	case "RUNNING":
		return state.Running, nil
	case "STOPPING", "STOPPED", "TERMINATED":
		return state.Stopped, nil
	}
	return state.None, nil
}
func (d *Driver) GetState() (state.State, error) {
	c, err := newComputeUtil(d)
	if err != nil {
		return state.None, err
	}

	// All we care about is whether the disk exists, so we just check disk for a nil value.
	// There will be no error if disk is not nil.
	instance, _ := c.instance()
	if instance == nil {
		disk, _ := c.disk()
		if disk == nil {
			return state.None, nil
		}
		return state.Stopped, nil
	}

	switch instance.Status {
	case "PROVISIONING", "STAGING":
		return state.Starting, nil
	case "RUNNING":
		return state.Running, nil
	case "STOPPING", "STOPPED", "TERMINATED":
		return state.Stopped, nil
	}
	return state.None, nil
}
// GetState returns a docker.hosts.state.State value representing the current state of the host.