[Bug 1582811] [NEW] update-grub produces broken grub.cfg with ZFS mirror volume

[Will Rouesnel]

Public bug reported:

When running update-grub on Xenial with an mirrored ZFS root, broken
grub.cfg files are consistently produced due to the root= line being
formatted with block devices and a newline inserted.

Specifically I get a line like so:
	linux	/ROOT/mint-13@/boot/vmlinuz-4.6.0-040600-generic root=/dev/sdj1
/dev/sdi3 ro   nomdmonddf nomdmonisw

The newline is what's included.

** Affects: grub2 (Ubuntu)
     Importance: Undecided
         Status: New

** Attachment added: "Example broken cfg"
   https://bugs.launchpad.net/bugs/1582811/+attachment/4664788/+files/grub.cfg

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https://bugs.launchpad.net/bugs/1582811

Title:
  update-grub produces broken grub.cfg with ZFS mirror volume

Status in grub2 package in Ubuntu:
  New

Bug description:
  When running update-grub on Xenial with an mirrored ZFS root, broken
  grub.cfg files are consistently produced due to the root= line being
  formatted with block devices and a newline inserted.

  Specifically I get a line like so:
  	linux	/ROOT/mint-13@/boot/vmlinuz-4.6.0-040600-generic root=/dev/sdj1
  /dev/sdi3 ro   nomdmonddf nomdmonisw

  The newline is what's included.

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