[Bug 1905990] Re: UC20 amd64 images are unnecessarily big

[Launchpad Bug Tracker]

This bug was fixed in the package livecd-rootfs - 2.703

---------------
livecd-rootfs (2.703) hirsute; urgency=medium

  * Do not hard-code the UC20 amd64 image size as now ubuntu-image should be
    able to properly calculate the needed size itself (LP: #1905990).

 -- Łukasz 'sil2100' Zemczak <lukasz.zemczak at ubuntu.com>  Fri, 27 Nov
2020 17:39:29 +0100

** Changed in: livecd-rootfs (Ubuntu)
       Status: In Progress => Fix Released

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https://bugs.launchpad.net/bugs/1905990

Title:
  UC20 amd64 images are unnecessarily big

Status in livecd-rootfs package in Ubuntu:
  Fix Released
Status in livecd-rootfs source package in Focal:
  In Progress
Status in livecd-rootfs source package in Groovy:
  Invalid

Bug description:
  [Impact]

  To work-around a bug in ubuntu-image, we hard-coded a `--image-size 8G` in livecd-rootfs for UC20 image builds. The reason for that was that ubuntu-image, in its initial UC20 image build implementation, was skipping yet-to-be-created partitions while calculating the final image size. This was fixed in ubuntu-image 1.10, and now the workaround is no longer required.
  Additionally, the HWE team asked if it would be possible for the amd64 images to be smaller than 8GB as they need them to fit on 4GB storage. Without the hard-coded image size the UC20 images are around 3.1GB in size - which would be perfect for their needs.

  [Test case]

  Build a -proposed based UC20 focal amd64 image via live-build.
  Download the image, decompress it and run `parted <imagefile>`. Print
  the partition table and make sure that the image is now big enough for
  all the contents (so at least 3GB) but smaller than the previous hard-
  coded size (8GB).

  [What could go wrong]

  The only parts I could see regressing is the thing we want to actually
  fix: so ultimately ubuntu-image not calculating the size properly. But
  this was already verified before pushing this SRU. The change only
  affects ubuntu-core focal+ builds, so the regression risk is really
  minimal.

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