Add debconf logic for GRUB_DISABLE_OS_PROBER to make it easier to
control things here. Particularly useful for the installer.
Closes: #1031594, #1012865.

Fix Secure Boot on arm64 with patch
arm64-handover-to-kernel-if-sb-enabled.patch.

Fix: #1033657

- disk/cryptodisk: When cheatmounting, use the sector info of the cheat
  device
- osdep/devmapper/getroot: Have devmapper recognize LUKS2
- osdep/devmapper/getroot: Set up cheated LUKS2 cryptodisk mount from DM
  parameters

Thanks for tracking this down Antoine!

I've mostly retired from GRUB maintenance since early 2022, so I think
it would be better if I weren't listed as an uploader in bookworm.
Thanks to Steve and Julian for picking up the torch!

Closes: #1030846

Closes: #1026915. Thanks to Pascal Hambourg for the patch.

It only causes problems. Closes: #1016737

Fixes #845683

to install onto devices

Apply patch from upstream,

Closes: #1001414

Closes: #1026092

Also needs backports from upstream commits to fix warnings/errors
from using gcc 12:

be8eb0eed util/mkimage: Fix dangling pointer may be used error
acffb8148 build: Fix -Werror=array-bounds array subscript 0 is outside array bounds
3ce13d974 lib/reed_solomon: Fix array subscript 0 is outside array bounds

Closes: #1021846. Thanks to программист некто for helping to debug the
problem!

Make font fallback handling work!

Due to a mistake in the buster update that left the CVE-2022-2601 bugs
in place, we need to bump SBAT for all of the Debian GRUB binaries. :-(

The previous security updates disallowed loading unsigned fonts when
in SB mode. To make things work again:

 * Embed the "unicode" font into the embedded memdisk image so it can
   be loaded.
 * Add the memdisk to our normal grubx64.efi loader too
 * Add a patch from Chris Coulson to make the font loader look for
   fonts in the memdisk whenever they're loaded.

Closes: #1024395, #1025352, #1024447

CVE-2022-2601, CVE-2022-3775

Bump SBAT level to 3 for grub-efi packages

In some filesystem utils like mksquashfs, it will silently change
behaviour and cause timestamps to unexpectedly change. Reproducible
builds are good and useful for shipped artifacts, but this causes
build-time tests to fail.

Closes: #1017944. Thanks to Valentin Kleibel for the patch.

it's apparently not needed. Closes: #1013698

to /etc/default/grub to make it easier for users to turn os-prober
back on if they want it. Closes: #1013797

As used in Ubuntu and possibly other downstreams (maybe Debian one day),
as that breaks the build.