rootfs structure smaller than contents should be fatal

[Michał Sawicz]

AIUI this warning should be fatal:

WARNING: rootfs structure size 1.17 GiB smaller than actual rootfs contents 1.53 GiB

I wasn't able to boot the image that had the ubuntu-seed volume too small, and it being just a WARNING made me look in the wrong place.

Is there a reason to pass this through? Should this be an explicit option?

[Ruhan van der Berg (ruhansa079)]

Hello, this bug affects me too. Just wanted to make some noise around this.

Generally, resizing the ubuntu-seed partition size to be a little bit bigger than the actual rootfs contents, resolves the issue for me. I'd agree that this must be a "error" and not a "warning". This regression has been here for a while, since I started building Ubuntu Core 16 images, before it was EOL'ed/deprecated.

In the current state, images are bootable on Ubuntu Core builds, but cannot install properly to the storage medium during "recovery".

[Emilio Lopez (lopezem)]

There is an option to add `--image-size` in the `ubuntu-image` command which does set the image size however, it still does not resize the ubuntu-seed partition. There is another bug that marked this very issue as "fixed" in the bug link below:

https://bugs.launchpad.net/ubuntu-image/+bug/1981744

Looking at the change log, in the ubuntu image repo, I can see that this bug was referenced and marked as fixed but this issue still persists today in below link:

https://github.com/canonical/ubuntu-image/blob/1313d059066a164c0365410477b54712927275c1/debian/changelog#L94

There hasn't been any update to fix this since.
This was also referred to here as well:

https://forum.snapcraft.io/t/uc20-image-based-on-reference-amd64-gadget-failing-to-install/21041

[Jonathan Prado (japseabery)]

This bug still persists in ubuntu-image 3.4+snap1

I tested it adding --image-size in the command:

   ubuntu-image snap --image-size=20G ...
   ubuntu-image snap --image-size 20G ...

My model is based on core22

  type: model
  architecture: amd64
  base: core22

but at finish show this warning:

WARNING: rootfs structure size 1.17 GiB smaller than actual rootfs contents 2.33 GiB