Slim down Ubuntu

[mauromorales]

In this PR:

• remove some packages
  • zfs: if we remove then there's no issue with nohang any more, but then we probably want to get rid of the test too? WDYT? 🐛 nohang service fails on Ubuntu 23.10 #2195
• introduce the concept of having an image be built for UKI, this image will not install dracut and will not create an initramfs, it will also not include GRUB (see grub and systemd-boot targets)

Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged):
Relates to #2283

[mauromorales]

Closing because we will go with the other solution that allows to have bigger images

IMO we should still do this despite the new option because:

1. there is no reason to have stuff in the UKI image that is not used there at all
2. we should really evaluate if all the packages we have there are actually required, there were things added that I'm not sure anyone is using and to anyone consuming Kairos they should be adding their packages on top not directly upstream
3. also evaluate in cases like zfs which breaks nohang atm and probably also will in 24.10, and right now we just let it break but what is the point on shipping it like that
4. now that we have a hard constrain is a good time to push some maintenance on our side and on canvos side. Otherwise we don't have that much time for it, even automated PRs don't get easily merged
5. at some point someone will hit the limit, and then we will have to come back and do this work which we already digged into

but obviously not every package needs to be removed here and there's a timeline, so I don't want that to be problematic

[Itxaka]

I would not directly close this, something like the initrd not building on uki images is really valueable! And some of the packages do seem to not be really needed at all!

[Itxaka]

I'm worried about the install suggests as that could bring a package that we need but we don't notice or know lol

[mauromorales]

I'm worried about the install suggests as that could bring a package that we need but we don't notice or know lol

ok, will revert

[mudler]

I think we should have a separate image for ubuntu-trustedboot. We can remove then all grub, dracut, and all the steps that are generating even the initramfs

[mauromorales]

I think we should have a separate image for ubuntu-trustedboot. We can remove then all grub, dracut, and all the steps that are generating even the initramfs

@mudler yes, this is what the systemd-boot vs grub targets do

[mudler]

I think we should have a separate image for ubuntu-trustedboot. We can remove then all grub, dracut, and all the steps that are generating even the initramfs

@mudler yes, this is what the systemd-boot vs grub targets do

sorry, didn't saw the workflow/additional dockerfile so I thought this was going into another direction. All good 👍

[Itxaka]

good for me as long as you disable the zfs job lol :D

[mauromorales]

@Itxaka I ended up keeping zfs for non-UKI so we don't have to decide that now