[Bug 1856684] Update Released

[Łukasz Zemczak]

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https://bugs.launchpad.net/bugs/1856684

Title:
  Populate .disk/info in ubuntu-image built images

Status in Ubuntu CD Images:
  Fix Released
Status in Ubuntu Image:
  Fix Committed
Status in livecd-rootfs package in Ubuntu:
  In Progress
Status in ubuntu-image package in Ubuntu:
  In Progress
Status in livecd-rootfs source package in Bionic:
  Fix Released
Status in ubuntu-image source package in Bionic:
  Fix Committed

Bug description:
  [Impact]

  Our installer-based images (those touched by debian-cd) get a
  .disk/info file written on the rootfs that contains useful information
  such as the build timestamp. We do not have anything like that
  available for our u-i images, while for preinstalled images sometimes
  it is very important to know from which batch of images the given one
  comes.

  We have decided that this will be very useful to have for our 18.04.4
  images.

  [Test Case]

  For ubuntu-image changes:

  Build a classic bionic image with something like:
  ubuntu-image classic -d -p ubuntu-cpc -O out/ -s bionic --cloud-init user-data --disk-info disk-info-file path/to/gadget/prime
  Boot up the image on kvm, check if /.disk/info is populated.

  For all the changes:

  Build a new classic bionic image via cdimage (raspi3 for instance).
  Boot it up (or mount it) and confirm that /.disk/info has the
  corresponding datestamp serial number in it.

  [Regression Potential]

  Besides classic images failing to build on cdimage, I don't think
  there's any other scenario I can think of. Any regression would most
  likely cause a build failure.

  [Other SRU Info]

  I am submitting a bionic ubuntu-image SRU without releasing the same
  changes for focal as I was originally planning to release this feature
  as part of 1.9. The exact same changes are landed in master, and will
  be released with 1.9 when it's ready, so there's certainty that it
  will not be missed. I didn't feel like doing another intermediate
  release for focal is strictly required - but I can do so if someone
  requires it.

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