[Bug 1828118] Re: docker tarballs contain /dev/null

[Michael Hudson-Doyle]

Uploads done for all series. Turns out we never backported the change
that regressed here to bionic but I uploaded the new version of the fix
to bionic UNAPPROVED anyway, it's definitely something we want done
there in general.

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Title:
  docker tarballs contain /dev/null

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

Bug description:
  [impact]

  This causes problems for some users as reported in
  https://github.com/tianon/docker-brew-ubuntu-core/issues/62. We don't
  want to regress those users.

  [test case]
  Build a livefs with PROJECT=ubuntu-base SUBPROJECT=minimized. Check that /dev is empty in the resulting tarball.

  [regression potential]
  The change pretty clearly only affects ubuntu-base:minimized builds, so checking that all of /var/cache/apt, /var/lib/apt/lists and /dev are empty should be sufficient, no other build types should regress.

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