Merge pull request #5761 from SvenDowideit/pr_out_tell_the_user_not_to_run_from_osx

tell the user not to run -d from OSX
Upstream-commit: 704e9f9ff0e5af18938085298a0f6f69262d693a
Component: engine

components/engine/docker/docker.go

@@ -98,6 +98,9 @@ func main() {
 	}
 
 	if *flDaemon {
+		if runtime.GOOS != "linux" {
+			log.Fatalf("The Docker daemon is only supported on linux")
+		}
 		if os.Geteuid() != 0 {
 			log.Fatalf("The Docker daemon needs to be run as root")
 		}