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

[Airton José Linhares]

** Changed in: livecd-rootfs (Ubuntu Xenial)
       Status: New => In Progress

** Changed in: livecd-rootfs (Ubuntu Xenial)
     Assignee: (unassigned) => Airton José Linhares (airares559)

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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:
  In Progress
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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