[Bug 1699913] Re: /var/lib/apt/lists has content in partner-images/Docker tarballs, which becomes stale quickly

[Michael Hudson-Doyle]

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

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https://bugs.launchpad.net/bugs/1699913

Title:
  /var/lib/apt/lists has content in partner-images/Docker tarballs,
  which becomes stale quickly

Status in cloud-images:
  New
Status in livecd-rootfs package in Ubuntu:
  New

Bug description:
  In the Docker builds, we explicitly include "rm -rf
  /var/lib/apt/lists/*" to remove the APT list files, because they're
  quite large, and they get stale very quickly.

  We instead recommend users always couple "apt-get update" with their
  "apt-get install" lines (see https://docs.docker.com/engine/userguide
  /eng-image/dockerfile_best-practices/#apt-get).

  Is there any chance of getting those files excluded or removed from
  the tarballs themselves?  Uncompressed, this would result in a ~30MB
  size decrease (obviously likely less dramatic for the compressed
  tarballs).  The user-facing result is that users are forced to run
  "apt-get update" before they can "apt-get install" (which for the
  Docker images, we already do, so there will be no user-facing effect
  except that the on-disk image layers will be ~30MB smaller).

  See also https://github.com/tianon/docker-brew-ubuntu-core/issues/90
  for more discussion on this (which is what led to filing this issue).
  :)

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