drivers/vmwarefusion/fusion_darwin.go
func (d *Driver) PreCreateCheck() error {
	// Downloading boot2docker to cache should be done here to make sure
	// that a download failure will not leave a machine half created.
	b2dutils := mcnutils.NewB2dUtils(d.StorePath)

	return b2dutils.UpdateISOCache(d.Boot2DockerURL)
}
func (d *Driver) PreCreateCheck() error {
	// Downloading boot2docker to cache should be done here to make sure
	// that a download failure will not leave a machine half created.
	b2dutils := mcnutils.NewB2dUtils(d.StorePath)

	return b2dutils.UpdateISOCache(d.Boot2DockerURL)
}
// PreCreateCheck checks that the machine creation process can be started safely.