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

[Dan Streetman]

** Also affects: grub2 (Ubuntu Eoan)
   Importance: Undecided
       Status: New

** Also affects: grub2 (Ubuntu Bionic)
   Importance: Undecided
       Status: New

** Also affects: grub2 (Ubuntu Xenial)
   Importance: Undecided
       Status: New

** Also affects: grub2 (Ubuntu Focal)
   Importance: Undecided
       Status: Confirmed

** Also affects: grub2 (Ubuntu Disco)
   Importance: Undecided
       Status: New

** Changed in: grub2 (Ubuntu Eoan)
       Status: New => Confirmed

** Changed in: grub2 (Ubuntu Disco)
       Status: New => Confirmed

** Changed in: grub2 (Ubuntu Bionic)
       Status: New => Confirmed

** Changed in: grub2 (Ubuntu Xenial)
       Status: New => Confirmed

** Changed in: grub2 (Ubuntu Focal)
   Importance: Undecided => High

** Changed in: grub2 (Ubuntu Eoan)
   Importance: Undecided => High

** Changed in: grub2 (Ubuntu Bionic)
   Importance: Undecided => High

** Changed in: grub2 (Ubuntu Disco)
   Importance: Undecided => High

** Changed in: grub2 (Ubuntu Xenial)
   Importance: Undecided => High

** Changed in: grub2 (Ubuntu Eoan)
   Importance: High => Medium

** Changed in: grub2 (Ubuntu Focal)
   Importance: High => Medium

** Changed in: grub2 (Ubuntu Bionic)
   Importance: High => Medium

** Changed in: grub2 (Ubuntu Xenial)
   Importance: High => Medium

** Changed in: grub2 (Ubuntu Disco)
   Importance: High => Medium

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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:
  Confirmed
Status in grub2 source package in Xenial:
  Confirmed
Status in grub2 source package in Bionic:
  Confirmed
Status in grub2 source package in Disco:
  Confirmed
Status in grub2 source package in Eoan:
  Confirmed
Status in grub2 source package in Focal:
  Confirmed

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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