[Bug 1855354] Re: lb chroot_archives eats apt preferences files

[Francis Ginther]

** Tags added: id-5de5ca6eb07b3c125672fe4e

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Title:
  lb chroot_archives eats apt preferences files

Status in livecd-rootfs package in Ubuntu:
  Fix Released
Status in livecd-rootfs source package in Trusty:
  Fix Released
Status in livecd-rootfs source package in Xenial:
  Fix Committed
Status in livecd-rootfs source package in Bionic:
  Fix Committed

Bug description:
  [impact]
  This breaks apt update in a trusty docker image that does not have ESM enabled.

  [test case]
  for trusty:

  Build a livefs with image_format=plain, project=ubuntu-base. Unpack
  it, do the usual pre-chroot setup dance (copy resolv.conf, bind mount
  proc and dev) chroot into it and run apt update.

  for the newer releases:
  We have no seeded package that create apt preferences in their postinst yet, so let's just check the autopkgtest results.

  [regression potential]
  The change could conceivably leave apt preference files we want deleted in an image. But this seems very unlikely.

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