As a part of the Stable Release Updates quality process a search for
Launchpad bug reports using the version of grub2 from xenial-proposed
was performed and bug 1750732 was found.  Please investigate this bug
report to ensure that a regression will not be created by this SRU. In
the event that this is not a regression remove the "verification-failed-
xenial" tag from this bug report and add the tag "bot-stop-nagging" to
bug 1750732 (not this bug). Thanks!

** Tags added: verification-failed-xenial

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  grub-probe for zfs assumes all devices prefix with /dev, ignoring

Status in grub:
Status in grub2 package in Ubuntu:
  Fix Released
Status in grub2-signed package in Ubuntu:
  Fix Released
Status in zfs-linux package in Ubuntu:
  Fix Released
Status in grub2 source package in Xenial:
  Fix Committed
Status in grub2-signed source package in Xenial:
  Fix Committed
Status in zfs-linux source package in Xenial:
  Fix Released

Bug description:
  Installs over ZFS where a ZFS disk is expected to be used as a root device.

  [Test case]
  - Run update-grub on a system with a ZFS root filesystem.

  [Regression Potential]
  Installs relying on the current broken behavior to avoid listing other 
operating systems in grub menu may find that new entries are added.


  update-grub runs /usr/sbin/grub-probe

  Without libzfslinux support compiled in, /usr/sbin/grub-probe runs
  ["zpool", "status", poolname] to find out ZFS info.

  zpool responds with device names as used at (I think!) pool creation
  time. Often, this is /dev/disk/by-id/... names, without the path.

  grub-probe then parses the output, and takes the names of devices, and
  if they do not start with a "/", it prepends "/dev/".

  It then tests the existence of the path name of the device. it fails.

  grub-probe then returns  something like

  /usr/sbin/grub-probe: error: failed to get canonical path of `/dev

  The actual path is of course /dev/disk/by-

  It can prepend smarter than "/dev" or it can understand ZFS natively,
  to fix the problem.

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