You can invoke ubuntu-image for a classic image build right now. Yes,
you need a specific gadget tree, but it doesn't require any additional
special infrastructure to get such a gadget tree prepared. For instance,
for testing purposes we already use a custom gadget tree that's
available https://github.com/sil2100/pc-amd64-gadget . I would not like
to block 1.2 on something that is not required for ubuntu-image to work.
Yes, it would be more convenient to have livecd-rootfs do the gadget
tree setup for people, but ubuntu-image is designed such that one can
just run it by hand with a selected gadget tree and get the resulting
image.

For instance, with the current livecd-rootfs you get a working classic image if 
you run this:
sudo ./ubuntu-image classic --project ubuntu-cpc 
https://github.com/sil2100/pc-amd64-gadget.git

I see it this way: for snap-based images we also don't require people to
run ubuntu-image through livecd-rootfs, manually you also have to
somehow 'fetch' by yourself a fitting model assertion and feed it to the
command. In this case you need to give it a specific gadget tree, but
that's all doable.

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https://bugs.launchpad.net/bugs/1730642

Title:
  Support generating a rootfs tree only

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