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

[Chad Miller]

Okay, so making grub ask for zfs details using a new, nonstandard
command-line parameter is bad because I can't depend on zfs version Foo
in grub, and I don't want to Conflict on older versions, and I don't
want zfs zpool status to fail on an unknown parameter.

So, this makes zfs zpool peek at the environment for an optional
variable "WITH_FULL_PATHS" and not truncate the emitted path names if it
is set. This change is compatible with everyone.

** Patch added: "zfs-linux patch to emit full paths"
   https://bugs.launchpad.net/ubuntu/+source/zfs-linux/+bug/1527727/+attachment/4572907/+files/zfs-linux__0.6.5.4-0ubuntu2__0.6.5.4-0ubuntu3.debdiff

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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:
  In Progress
Status in zfs-linux package in Ubuntu:
  In Progress

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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