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

[Chad Miller]

Bug confirmed here:

https://github.com/zfsonlinux/grub/issues/5

and step 2 of

https://github.com/zfsonlinux/pkg-zfs/wiki/HOWTO-install-Ubuntu-14.04---
15.04-to-a-Native-ZFS-Root-Filesystem

which advocates some craziness with udev to copy /dev/disk/by-id/ names
to /dev/ .

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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 grub2 package in Ubuntu:
  Confirmed

Bug description:
  update-grub runs /usr/sbin/grub-probe

  /usr/sbin/grub-probe runs ["zpool", "status", poolname]

  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

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