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

[Will Rouesnel]

The problem seems to be that grub-mkconfig doesn't account for grub-
probe producing a multiple lines of output with a ZFS root device:

/usr/sbin/grub-probe --target=device /
/dev/sdj1
/dev/sdi3

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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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