[Bug 1238347] Re: Invalid grub.cfg generated if root on RAID1 btrfs

[Toby Corkindale]

>From /usr/sbin/grub-mkconfig
Note the addition of the "head -n 1" to the pipeline. Not a great fix, but does work.

# Device containing our userland.  Typically used for root= parameter.
GRUB_DEVICE="`${grub_probe} --target=device / | head -n 1`"
GRUB_DEVICE_UUID="`${grub_probe} --device ${GRUB_DEVICE} --target=fs_uuid 2> /dev/null`" || true

# Device containing our /boot partition.  Usually the same as GRUB_DEVICE.
GRUB_DEVICE_BOOT="`${grub_probe} --target=device /boot | head -n 1`"

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https://bugs.launchpad.net/bugs/1238347

Title:
  Invalid grub.cfg generated if root on RAID1 btrfs

Status in “grub2” package in Ubuntu:
  New

Bug description:
  If Ubuntu Saucy is installed onto a btrfs root device, which is
  configured to be a RAID1 mirror (or probably other configurations)
  then the grub.cfg is generated with invalid entries.

  This is because /etc/grub.d/10_linux gets *both* device names from
  btrfs, with a newline between them, and then just sticks that
  everywhere in the config file where it was expecting just one device.
  The newline in the middle prematurely truncates lines and then starts
  new invalid ones.

  To reproduce, create your btrfs device something like this during install:
  mkfs.btrfs -d raid1 -m raid1 /dev/sda1 /dev/sdb1

  ProblemType: Bug
  DistroRelease: Ubuntu 13.10
  Package: grub-common 2.00-19ubuntu1 [modified: usr/sbin/grub-mkconfig usr/share/grub/grub-mkconfig_lib]
  ProcVersionSignature: Ubuntu 3.11.0-11.17-generic 3.11.3
  Uname: Linux 3.11.0-11-generic x86_64
  NonfreeKernelModules: nvidia
  ApportVersion: 2.12.5-0ubuntu1
  Architecture: amd64
  Date: Fri Oct 11 12:21:17 2013
  InstallationDate: Installed on 2013-10-09 (1 days ago)
  InstallationMedia: Ubuntu 13.10 "Saucy Salamander" - Beta amd64 (20130925.1)
  MarkForUpload: True
  SourcePackage: grub2
  UpgradeStatus: No upgrade log present (probably fresh install)
  modified.conffile..etc.grub.d.10.linux: [modified]
  mtime.conffile..etc.grub.d.10.linux: 2013-10-11T12:18:01.364605

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