[Bug 1776706] Re: clean_loops can't be called multiple times with set -u

[Brian Murray]

** Also affects: livecd-rootfs (Ubuntu Bionic)
   Importance: Undecided
       Status: New

** Also affects: livecd-rootfs (Ubuntu Xenial)
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1776706

Title:
  clean_loops can't be called multiple times with set -u

Status in livecd-rootfs package in Ubuntu:
  In Progress
Status in livecd-rootfs source package in Xenial:
  New
Status in livecd-rootfs source package in Bionic:
  New

Bug description:
  In live-build/functions, clean_loops calls `unset backing_img`; if you
  call clean_loops again, the "if [ -n "${backing_img}" ]; then" line
  then causes the script to exit if you're running with `set -u`.

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