On Monday, 9 February 2026 19:56:00 CET Christian Schoenebeck wrote:
> grub-probe fails on encrypted zfs pools, causing $rpool variable
> to be empty. Therefore check variables $rpool and $bootfs to
> be both non-empty strings before assembling LINUX_ROOT_DEVICE.
>
> If one of the two variables is empty, use "zfs list" as fallback
> for detecting the zfs root dataset instead.
>
> Signed-off-by: Christian Schoenebeck <[email protected]>
> ---
> util/grub.d/10_linux.in | 8 +++++++-
> 1 file changed, 7 insertions(+), 1 deletion(-)
Ping, anyone?
/Christian
> diff --git a/util/grub.d/10_linux.in b/util/grub.d/10_linux.in
> index 07649cd3b..acbd2ab64 100644
> --- a/util/grub.d/10_linux.in
> +++ b/util/grub.d/10_linux.in
> @@ -75,7 +75,13 @@ case x"$GRUB_FS" in
> xzfs)
> rpool=`${grub_probe} --device ${GRUB_DEVICE} --target=fs_label
> 2>/dev/null || zdb -l ${GRUB_DEVICE} | awk -F \' '/ name/ { print $2 }'`
> bootfs="`make_system_path_relative_to_its_root / | sed -e "s,@$,,"`"
> - LINUX_ROOT_DEVICE="ZFS=${rpool}${bootfs%/}"
> + # grub-probe fails on encrypted zfs pools, use zfs list as fallback
> + if [ -n "$rpool" ] && [ -n "$bootfs" ]; then
> + LINUX_ROOT_DEVICE="ZFS=${rpool}${bootfs%/}"
> + else
> + root_dataset=`zfs list -Ho mountpoint,name | grep '^/[[:space:]]'
> | tail -n1 | cut -f 2 2>/dev/null || true`
> + LINUX_ROOT_DEVICE="ZFS=${root_dataset}"
> + fi
> ;;
> esac
>
> --
> 2.47.3
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