implement kernel hook

[stapelberg]

• /out/vmlinuz needs to be copied to /boot/vmlinuz-<pkg-version>
• build initramfs in /boot/initramfs-<pkg-version>.img
• PKG_CONFIG_PATH=/ro/systemd-amd64-239-7/out/share/pkgconfig/ dracut --debug --force /boot/initramfs-5.1.9.img 5.1.9
• when exactly should it be built? dracut copies a bunch of packages which may be good to update first in their entirety? i.e. defer the hook (add atexit hook list to cmd/distri/distri.go) instead of running it immediately?
• run grub-mkconfig via /etc/update-grub (created by distri pack)
• run grub-install (maybe from /etc/update-grub)?
• remove the files when gc removes the package

[stapelberg]

Only the gc item is left, demoting from release-blocker to enhancement.

[stapelberg]

We need to run /etc/update-grub after the initrd was generated.

[stapelberg]

This can be fixed after the release because updates first install distri1 updates. Removing release-blocker label.

[miniBill]

From experience with Debian, you want initrd build/cleanup to happen atexit, otherwise you get to the paradoxical and slow situation where it gets rebuilt n times if you update kernel, firmware, and VirtualBox at the same time

[stapelberg]

Yep, we already do this :)

[miniBill]

Sorry, I misread the subitem in the original post as not done yet =)
Godspeed!