[Bug 2077572] Re: Latest in main branch creates too small images for UC

[Alfonso Sanchez-Beato]

It looks like what is missing in the disk are 16MiB minus 34 sectors
(size of the GPT header?). Maybe it is worth exploring if it is the same
size for different partition definitions or if one of the partitions has
not been considered in the calculations.

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Title:
  Latest in main branch creates too small images for UC

Status in Ubuntu Image:
  In Progress

Bug description:
  When building from https://github.com/canonical/ubuntu-
  image/commit/43771d1c02c35c2f78da1022274f8d7c2e47e4cc , I get this
  when creating an image with simple command:

  $ ubuntu-image snap <model>

  when running it:

  Aug 21 18:28:08 qemuname snapd[1675]: Device     Start     End Sectors  Size Type
  Aug 21 18:28:08 qemuname snapd[1675]: /dev/vda1   2048    4095    2048    1M BIOS boot
  Aug 21 18:28:08 qemuname snapd[1675]: /dev/vda2   4096 2461695 2457600  1.2G EFI System
  Aug 21 18:28:08 qemuname snapd[1675]: /dev/vda3: Created a new partition 3 of type 'Linux filesystem' and of size 750 MiB.
  Aug 21 18:28:08 qemuname snapd[1675]: /dev/vda4: Created a new partition 4 of type 'Linux filesystem' and of size 32 MiB.
  Aug 21 18:28:08 qemuname snapd[1675]: /dev/vda5: The last usable GPT sector is 6127649, but 6160383 is requested.
  Aug 21 18:28:08 qemuname snapd[1675]: Failed to add #5 partition: Invalid argument
  Aug 21 18:28:08 qemuname snapd[1675]: Leaving.
  Aug 21 18:28:08 qemuname snapd[1675]: -----

  so it seems that created images are slightly smaller than they should
  to be able to run normally.

  Furthermore, I see this warning when running the tool:

  WARNING: No mkfs configuration found for this series: 16.04. Will
  fallback on the default one.

  while I am actually running on 22.04. I wonder if the "series" of the
  model (that is always 16) is being taken as the distro version, which
  should be deducted from the model base instead.

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