cli

type Deployer interface {
	// Carries reports the non-asset parts this provider can deliver (every
	// provider delivers the assets themselves). The common layer assembles a
	// bundle without knowing the destination, so this is how it learns what a
	// destination can and cannot take.
	Carries() []deployPart

	// Deploy sends the bundle to the destination. progress receives short
	// human-readable lines so the caller can print them. It returns the site's
	// live URL when the provider knows it ("" when it can't — e.g. an SFTP/FTPS
	// host whose public URL depends on the owner's domain).
	Deploy(b deployBundle, progress func(string)) (url string, err error)
}