[Bug 1527727] Re: grub-probe for zfs assumes all devices prefix with /dev, ignoring /dev/disk/...

[Chad Miller]

What it looks like without this patch:

Setting up grub-efi-amd64 (2.02~beta2-36) ...
Installing for x86_64-efi platform.
grub-install: error: failed to get canonical path of `/dev/ata-ST31000333AS_XXXXXXXX-part1'.
Failed: grub-install --target=x86_64-efi --force-extra-removable
WARNING: Bootloader is not properly installed, system may not be bootable
/usr/sbin/grub-probe: error: failed to get canonical path of `/dev/ata-ST31000333AS_XXXXXXXX-part1'.
dpkg: error processing package grub-efi-amd64 (--configure):
 subprocess installed post-installation script returned error exit status 1
dpkg: dependency problems prevent configuration of linux-image-extra-4.4.0-4-generic:
 linux-image-extra-4.4.0-4-generic depends on linux-image-4.4.0-4-generic; however:
  Package linux-image-4.4.0-4-generic is not configured yet.

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https://bugs.launchpad.net/bugs/1527727

Title:
  grub-probe for zfs assumes all devices prefix with /dev, ignoring
  /dev/disk/...

Status in grub:
  Unknown
Status in grub2 package in Ubuntu:
  Confirmed

Bug description:
  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
  /ata-ST31000333AS_99999999-part1'.

  The actual path is of course /dev/disk/by-
  id/ST31000333AS_99999999-part1

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

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