[Bug 1834095] Re: update-grub fails on zfs with root and boot datasets

[Didier Roche]

Thanks for the results!

Can you run "zfs get all bpool/BOOT/ubuntu" please?

I'm a little bit puzzled about this line:
bpool/BOOT/ubuntu      121M   246M   120M  legacy
legacy means you have a manual mountpoint set on this dataset. How do you mount it? Can you paste your /etc/fstab (I guess you put it there?)

I wonder if <pool>/BOOT/ was hardcoded in some way and it had a way to
detect dataset was mounted.

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Title:
  update-grub fails on zfs with root and boot datasets

Status in grub2 package in Ubuntu:
  Incomplete

Bug description:
  This issue was encountered on a virtual machine installation of Ubuntu
  19.10 running zfs.  After reloading several times from backup and
  placing the original version of grub2 on hold it was verified that
  upgrading to the newer version of grub caused update-grub to
  improperly detect the two zfs datasets, bpool (boot pool) and rpool
  (root pool).

  To recap:
  1) lsb_release -rd
  Description:    Ubuntu Eoan Ermine (development branch)
  Release:        19.10
  2) apt-cache policy grub-pc
  grub-pc:
    Installed: 2.02+dfsg1-12ubuntu2
    Candidate: 2.02+dfsg1-12ubuntu3 (version with issue in this report)
    Version table:
       2.02+dfsg1-12ubuntu3 500
          500 http://archive.ubuntu.com/ubuntu eoan/main amd64 Packages
   *** 2.02+dfsg1-12ubuntu2 100
          100 /var/lib/dpkg/status
  3) What I expected to happen: update-grub runs without error
  4) What happened instead: update-grub did not run correctly, resulting in unbootable system (only entries for memtest86+ in grub menu).

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