[Bug 1961760] Re: `disk-image` not granular enough, often builds unused artifacts

[Brian Murray]

Hello Ivan, or anyone else affected,

Accepted livecd-rootfs into bionic-proposed. The package will build now
and be available at https://launchpad.net/ubuntu/+source/livecd-
rootfs/2.525.58 in a few hours, and then in the -proposed repository.

Please help us by testing this new package.  See
https://wiki.ubuntu.com/Testing/EnableProposed for documentation on how
to enable and use -proposed.  Your feedback will aid us getting this
update out to other Ubuntu users.

If this package fixes the bug for you, please add a comment to this bug,
mentioning the version of the package you tested, what testing has been
performed on the package and change the tag from verification-needed-
bionic to verification-done-bionic. If it does not fix the bug for you,
please add a comment stating that, and change the tag to verification-
failed-bionic. In either case, without details of your testing we will
not be able to proceed.

Further information regarding the verification process can be found at
https://wiki.ubuntu.com/QATeam/PerformingSRUVerification .  Thank you in
advance for helping!

N.B. The updated package will be released to -updates after the bug(s)
fixed by this package have been verified and the package has been in
-proposed for a minimum of 7 days.

** Changed in: livecd-rootfs (Ubuntu Bionic)
       Status: New => Fix Committed

** Tags added: verification-needed-bionic

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https://bugs.launchpad.net/bugs/1961760

Title:
  `disk-image` not granular enough, often builds unused artifacts

Status in livecd-rootfs package in Ubuntu:
  Fix Released
Status in livecd-rootfs source package in Bionic:
  Fix Committed
Status in livecd-rootfs source package in Focal:
  Fix Committed
Status in livecd-rootfs source package in Impish:
  Fix Released

Bug description:
  [Impact]

   * Due to how `disk-image` series file in `ubuntu-cpc` is structured,
  it builds BIOS and UEFI images at the same time. However, certain
  images (e.g., GCE images) require only UEFI image to be built, BIOS
  image is being simply discarded. This results in longer build times.

  [Test Plan]

   * Build any image that depends on `disk-image` (e.g. a GCE image) with `livefs-build` or `ubuntu-bartender`
   * Read build logs and observe what build artifacts are produced: `disk.ext4` is the BIOS image and `disk-uefi.ext4` is the UEFI image

  [Where problems could occur]

   * Due to changes in the `disk-images` series file the order in which
  BIOS and UEFI image are built has changed, if there's something
  sensitive to the order in which those artifacts are built it might
  break

  [Other Info]
   
   * CPC images will be switched from `disk-image` to `disk-image-uefi` once the update is released

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