By placing the kernel in minimal, we can achieve the following
improvements:
1. Space savings - there are redundant packages present in the ship-live
pool and in the live layer. Adding the kernel to minimal means that
the kernel is already in the live layer, and we don't then also need
it in the pool.
2. Time savings - informal vm testing suggests more than a minute
improvement to have the kernel preinstalled over installing it at
runtime.
As always, there is a cost tradeoff:
1. If a different kernel is desired, we need to be able to remove this
preinstalled kernel. Relevant curtin and subiquity changes are
already landed.
2. When installing that other kernel, it'll take longer than today due
to still needing to install a kernel at runtime + the time cost of
removing the preinstalled kernel.
unminimize is currently present at /usr/local/sbin/unminimize,
which is spit out by livecd-rootfs currently. We'd like to switch
that to use the packaged unminimize, which will be at
/usr/bin/unminimize instead.
There was a change made by me in https://code.launchpad.net/~philroche/livecd-rootfs/+git/livecd-rootfs/+merge/466388
as part of LP: #2066905 to remove references to LXD in the unminimize scripts
but I also removed the calls to `unminimize` in error.
This still needs to run but without any references to LXD which no longer
needs to be `unminimized` via snap installation.
The LXD snap is no longer seeded in any images since Noble+ so the LXD related unminimize logic in
./live-build/auto/build?h=ubuntu/noble and ./live-build/ubuntu-server/hooks/01-unminimize.chroot_early
is no longer required.
lxd-installer can remain installed.
The unminimize script will try to install the lxd snap using the shim script
`/usr/sbin/lxd` from the lxd-installer package.
Previously `unminimize` was using `snap`
to install `lxd` directly which was being diverted by diverting the `snap` command.
This is no longer the case so we can remove `/usr/sbin/lxd` from the lxd-installer package
if it exists and then redirect any calls to `/usr/sbin/lxd` to `/bin/true`
This is a cherry pick forward port from Jammy livecd-rootfs version 2.765.37.
(cherry picked from commit 8b83212372)
/etc/hosts in an installed system comes from one of several places:
- the netbase package which ships a sane default
- scripts/casper-bottom/18hostname, which is mostly identical to the netbase
one but sets a hostname to the flavor name
- the installer which writes one to the target fs
- chroot includes in livecd-rootfs
A chroot include is only needed for images that don't include netbase (so
don't inherit from the minimal seed), don't boot casper, and don't run an
installer.
NONE of these conditions are true for the ubuntu-server live image. And in
addition, the /etc/hosts here differs from the others.
So, remove it.
live-build/auto/config:
- for Ubuntu Server live images and the arm64+tegra full arch, build a
tegra variant with linux-nvidia-tegra as the flavor and
linux-nvidia-tegra as the kernel meta-package
- default to nvidia-$SUBARCH as the kernel flavor for all images using
arm64+tegra as full arch
hooks/03-kernel-metapkg.chroot_early:
- use linux-nvidia-tegra as kernel meta-package for the nvidia-tegra
flavor
* Fix some issues with the netboot tarballs:
- Include the signed shim (oops).
- Make the kernel path on disk and in the bootloader config match (more
oops).
- Make paths more architecture dependent as the code in grubnetXXX.efi to
probe a platform dependent path first doesn't work.
At this point all of the custom final_message is now obsolete.
Remove it, letting us instead use the default final_message.
Leave a note about the above.
Dan Bungert
Utkarsh Gupta
Philip Roche
Łukasz 'sil2100' Zemczak
Steve Langasek
Michael Hudson-Doyle
Loïc Minier