This commit at https://anonscm.debian.org/cgit/d-i/debootstrap.git/diff/functions?id=5518b79792dd93a416464c0744b87eb1a32ff770
appears to 100% of the time invoke setup_devices_simple function; which means pre-existing paths can never execute. at worst this led to an issue w/ crouton an installer for ubuntu chroots tailored for chrome os: https://github.com/dnschneid/crouton/issues/2387 and at best - it yields dead code; a sign of sloppy development. if it cannot execute it should be removed.
