[Bug 1771177] Update Released

[Łukasz Zemczak]

The verification of the Stable Release Update for livecd-rootfs has
completed successfully and the package has now been released to
-updates.  Subsequently, the Ubuntu Stable Release Updates Team is being
unsubscribed and will not receive messages about this bug report.  In
the event that you encounter a regression using the package from
-updates please report a new bug using ubuntu-bug and tag the bug report
regression-update so we can easily find any regressions.

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https://bugs.launchpad.net/bugs/1771177

Title:
  support preseeding snaps in 16.04

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

Bug description:
  [Impact]
  Customized images built for 16.04

  [Test case]
  1) Install livecd-rootfs
  2) Take a copy of the code tree for livecd-rootfs.
  3) Prepare a project/subproject tree for hooks:
  $ mkdir -p live-build/xyz/hooks/
  $ echo <<EOF > live-build/xyz/hooks/000-snap-preseed.binary
  #!/bin/sh

  . config/functions

  snap_preseed telegram
  EOF

  3) Build the image using livecd-rootfs:
  $ PROJECT=xyz SUBPROJECT=snapped lb config
  $ PROJECT=xyz SUBPROJECT=snapped lb build

  4) Validate that the image contains the preseeded snap as intended.

  [Regression potential]
  Make sure any unexpected build behavior for images is investigated as a potential regression: the addition of config/functions (live-build/functions) in the build may lead to image builds failing, or could otherwise break the behavior of a part of the image build such that components of build images are missing. All images regularly built from livecd-rootfs should be tested to ensure they are equivalent to those previously built.

  ---

  18.04 builds can included preseeded snaps; but 16.04 can't.

  Please backport the relevant functions of livecd-rootfs, so while
  (ubuntu seed)-based preseeding of snaps can't be done yet (changing
  seeds might otherwise change image contents), customized images can
  include their own snaps as necessary by calling the right functions in
  hook scripts.

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