@Mathieu, thanks for your work on this.
Regarding the test cases, I think that the second case needs an
additional step:
-- initramfs update --
1) install Ubuntu, using ZFS as a rootfs.
2) change 'MODULES=most' to 'MODULES=dep' in /etc/initramfs-tools/initramfs.conf
3) run "sudo update-initramfs
** Patch added: "mkinitramfs.patch"
https://bugs.launchpad.net/ubuntu/+source/initramfs-tools/+bug/1661629/+attachment/5162606/+files/mkinitramfs.patch
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> It might be easier to resolve this by considering this as "mkinitramfs
fails on ZFS root without /etc/fstab lines for the ZFS filesystems when
MODULES=dep is used".
Yes, that sounds like an accurate summary. I'm not sure I follow how
/etc/fstab is related, though. Looking briefly through
> I'm not particularly familiar with this part of initramfs-tools, but
it seems to me that essentials like the loading of the virtio_pci module
would be short-circuited by your patch.
Yes, you're right, thanks for pointing that out. If the driver isn't
built-in to the kernel, it would be omitted.
Maybe there is something better, but it seems like the simplest change
that would fix this would be something along the lines of the patch
below. This just assumes that if the filesystem type is listed as zfs
then it actually is zfs, and it adds the zfs module. With this change I
was able to build
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