Replace mdev with udev:

[jacobweinstock]

Description

This gets us persistent network interface naming.

@rpardini , you did a bunch of work creating images/hook-mdev/persistent-storage.sh, when/if you have some cycles, would you mind checking this out and verifying if you see the same functionality?

Why is this needed

Fixes: #

How Has This Been Tested?

How are existing users impacted? What migration steps/scripts do we need?

Checklist:

I have:

• updated the documentation and/or roadmap (if required)
• added unit or e2e tests
• provided instructions on how to upgrade

[rpardini]

Tested, seems to work fine -- being an actual systemd container it does disk/by-id et al "correctly", which is was what I was trying to emulate in persistent-storage.sh, so win all around in my eyes.

The only downside is that the thing is quite large, including glibc and systemd etc amounting to around 116mb of stuff.
Only hook-docker is bigger at 215mb.

All that said I'd rather have this than the mdev prone-to-fail dance we had before -- and this opens up the path for a (fully) systemd-based thing in the future.

Thanks!

[jacobweinstock]

Thanks for reviewing and testing this, @rpardini ! Yeah, I tried to find a way to slim it down but couldn't find anything that worked. With the new Tink Agent supporting containerd we can move to that and get rid of Docker entirely from Hook. That should get us back all the space and more.