cryptsetup does not support ZFS

[Richard Laager]

cryptsetup does not currently support ZFS.

For example, this happens on 16.04:
$ sudo update-initramfs -c -k all
update-initramfs: Generating /boot/initrd.img-4.4.0-34-generic
cryptsetup: WARNING: could not determine root device from /etc/fstab
update-initramfs: Generating /boot/initrd.img-4.4.0-31-generic
cryptsetup: WARNING: could not determine root device from /etc/fstab

The attached patch adds ZFS support to cryptsetup.

[Ubuntu Foundations Team Bug Bot (crichton)]

The attachment "A patch to add ZFS support to cryptsetup." seems to be a debdiff. The ubuntu-sponsors team has been subscribed to the bug report so that they can review and hopefully sponsor the debdiff. If the attachment isn't a patch, please remove the "patch" flag from the attachment, remove the "patch" tag, and if you are member of the ~ubuntu-sponsors, unsubscribe the team.

[This is an automated message performed by a Launchpad user owned by ~brian-murray, for any issue please contact him.]

[Brian Murray (brian-murray)]

You might have a look at debian bug https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=820888 which is also about zfs. Regardless of whether or not it is the same issue it would be good to get the patch you've created into Debian also.

[Richard Laager (rlaager)]

I think that's unrelated, but I'm not sure. I filed Debian bug #838001 for this, with my patch, and linked it here.

[Iain Lane (laney)]

Thanks for forwarding it. Would you please re-subscribe ubuntu-sponsors once the patch is merged upstream at Debian?

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Richard Laager (rlaager)]

This is stalled with Debian. Any chance of seeing this merged for Bionic?

[vvhk (vvhk-deactivatedaccount-deactivatedaccount)]

Other than the warning, are there any ill effects of this? Root on LUKS'd ZFS pool seems to be booting and mounting fine.

[Richard Laager (rlaager)]

You have to add the initramfs option to /etc/crypttab, but otherwise it's just the warning.