Grub Unknown File System

[ellisonpatterson]

System information

Distribution Name | Gentoo
Distribution Version | RR
Linux Kernel | 5.1.4
Architecture | amd64
ZFS Version | 0.8.0-r0-gentoo
SPL Version | 0.8.0-r0-gentoo

Describe the problem you're observing

So if I create a volume and enable encryption, regardless of where I nest it in, it causes grub to think it doesn't know the filesystem and if I try to reboot with that encrypted volume still available (not destroyed) it won't boot and goes to grub-rescue, complaining that it doesn't know the file system type. Once I delete it, it's fixed.

Describe how to reproduce the problem

op2 ~ # zfs create -o encryption=aes-256-gcm -o keyformat=passphrase -o keylocation=prompt -o mountpoint=/opt/test rpool/ROOT/test
Enter passphrase:
Re-enter passphrase:
op2 ~ # grub-probe /
grub-probe: error: unknown filesystem.
op2 ~ # zfs destroy rpool/ROOT/test
op2 ~ # grub-probe /
zfs
op2 ~ # echo "wut"

[gmelikov]

Grub doesn't support many of new 0.7 and 0.8 features, you can find useful information for ex. here http://git.savannah.gnu.org/cgit/grub.git/tree/grub-core/fs/zfs/zfs.c#n276 . If you want to use native ZFS encryption - please use other boot method, for ex. UEFI kernel boot.

[misterhsp]

Is there any hope that Grub can do that in the near future? efi-stub doesn't work on my Acer notebook. Entry created with efibootmgr but I don't see anything in the boot menu.

thanks...

[gmelikov]

@misterhsp unfortunately no. If you have problems with other boot methods - just use additional boot pool with minimal features flags activated.