Bug#1102160: upgrade-reports: Bookworm to Trixie [amd64][EFI] initramfs unpacking failed invalid magic at start of compressed archive

[Martin-Éric Racine]

Hey Felix,

pe 18.4.2025 klo 19.39 Felix Zielcke (fzielcke at z-51.de) kirjoitti:
>
> Am Freitag, dem 18.04.2025 um 19:10 +0300 schrieb Martin-Éric Racine:
> > The Debian changelog suggests what caused this:
> >
> > Someone enabled compiling GRUB with FUSE3 to enhance QEMU support.
> > The problem with FUSE3 is that it only has very basic support for
> > btrfs, lacking among other things support for subvolumes. This is a
> > serious issue considering how widely spread btrfs has become and how
> > debian-installer uses subvolumes by default whenever someone selects
> > brtfs as the filesystem type. Rendering hosts unbootable is a big
> > no-no. I would really hope the release team to step in on this one.

> FUSE support in GRUB 2 is only used for the grub-mount binary. And not
> at all in the actual booting code loaded from EFI/BIOS.
>
> You could though test the fs drivers of it with grub-mount:
>
> grub-mount /dev/sda2 /mnt (replace sda2 with your / partition)
> sha1sum /mnt/@rootfs/boot/initrd.img-6.12.20-amd64
> sha1sum /@rootfs/boot/initrd.img-6.12.20-amd64
>
> both commands should output the same hash sum.
> And yes, this is safe with a mounted fs because the GRUB fs code is
> 100% complete read-only.

Exactly how does the above address the issue I reported?

Martin-Éric