daemon/graphdriver/register/register_overlay.go - third_party/github.com/moby/moby - Git at Google

 // +build !exclude_graphdriver_overlay,linux

 package register

 import (
 	// register the overlay graphdriver
 	_ "github.com/docker/docker/daemon/graphdriver/overlay"
 )
	// +build !exclude_graphdriver_overlay,linux

	package register

	import (
	// register the overlay graphdriver
	_ "github.com/docker/docker/daemon/graphdriver/overlay"
	)