** Description changed:

  update-grub runs /usr/sbin/grub-probe
  
  /usr/sbin/grub-probe runs ["zpool", "status", poolname]
  
  zpool responds with device names as used at pool creation time. Often,
- this is /dev/disk/by-id/... names.
+ 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'.

** Description changed:

  update-grub runs /usr/sbin/grub-probe
  
  /usr/sbin/grub-probe runs ["zpool", "status", poolname]
  
- zpool responds with device names as used at pool creation time. Often,
- this is /dev/disk/by-id/... names, without the path.
+ 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'.

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

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

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