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

[Didier Roche]

Hey, thanks for reporting this bug and help to make ubuntu better.

Can you please post the following so that we can debug what went wrong. Outputs of:
* zpool list
* zfs list
for each dataset:
* zfs get all <datasetname>

That way, we can find why your datasets and boot pools were not detected
and add a test case for it.

Also, the output of update-grub would be excellent to ensure there was
no failure.


** Changed in: grub2 (Ubuntu)
       Status: New => Incomplete

** Changed in: grub2 (Ubuntu)
     Assignee: (unassigned) => Didier Roche (didrocks)

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https://bugs.launchpad.net/bugs/1834095

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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