Re: [PATCH] zfs: fix root dataset detection on encrypted pools

[Christian Schoenebeck via Grub-devel <grub-devel@gnu.org>]

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 <linux_oss@crudebyte.com>
> ---
>  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



_______________________________________________
Grub-devel mailing list
Grub-devel@gnu.org
https://lists.gnu.org/mailman/listinfo/grub-devel