Comment 2 for bug 2045006

Hi Paul,

When CE team release images to customers, we release an image building guide as well. The image build guide will guide customers to set up a build env (VM) based on the version of images. If the image is uc18, the build env will be bionic (18.04) which has u-i 1.x installed.

CE released uc18 images to a customer. The u-i 1.x is used to build uc18 images. The customer would like to use a new feature "--validation=enforce" which u-i 2.x starts to support. Unfortunately, the image built by u-i 2.x doesn't has the GPT backup header. And, the system fails to boot without the GPT backup header.

There are two workarounds:
1. Update gadget.yaml to increase the partition size
2. Increase the image size by u-i parameter (--image-size)

I would like to confirm if the missing GPT backup header is expected when rootfs structure size smaller than actual rootfs contents. If it's an issue, I would expect that it can be fixed on u-i 3 and imagecraft. I haven't tried u-i 3.x. Will try it and get back to you.