[Bug 557144] Re: update-grub2 does not honor the right boot device

[Thomas Schweikle]

** Changed in: grub2 (Ubuntu)
       Status: New => Fix Released

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https://bugs.launchpad.net/bugs/557144

Title:
  update-grub2 does not honor the right boot device

Status in “grub2” package in Ubuntu:
  Fix Released

Bug description:
  Assume grub installed on its own partition, the kernel and initrd in "/boot". fstab looks like:
  <pre>
  UUID=cd4782ce-cbe5-46bb-a1ca-0ef613d65be1 /                ext4        errors=remount-ro                                 0       1
  UUID=ffa76c51-70ca-4557-ac26-798e64ff9502 /boot/grub       ext3        errors=remount-ro                                 0       2
  </pre>

  update-grub now generates:
  <pre>
  ### BEGIN /etc/grub.d/10_linux ###
  menuentry "Ubuntu, mit Linux 2.6.32-19-generic" --class ubuntu --class gnu-linux --class gnu --class os {
          recordfail
          insmod ext2
          set root='(hd0,1)'
          search --no-floppy --fs-uuid --set ffa76c51-70ca-4557-ac26-798e64ff9502
          linux   /vmlinuz-2.6.32-19-generic root=UUID=cd4782ce-cbe5-46bb-a1ca-0ef613d65be1 ro   quiet splash
          initrd  /initrd.img-2.6.32-19-generic
  }
  menuentry "Ubuntu, mit Linux 2.6.32-19-generic (Wiederherstellungsmodus)" --class ubuntu --class gnu-linux --class gnu --class os {
          recordfail
          insmod ext2
          set root='(hd0,1)'
          search --no-floppy --fs-uuid --set ffa76c51-70ca-4557-ac26-798e64ff9502
          echo    Linux 2.6.32-19-generic wird geladen …
          linux   /vmlinuz-2.6.32-19-generic root=UUID=cd4782ce-cbe5-46bb-a1ca-0ef613d65be1 ro single
          echo    Initiale Ramdisk wird geladen …
          initrd  /initrd.img-2.6.32-19-generic
  }
  ### END /etc/grub.d/10_linux ###
  </pre>

  The UUID of the grub-partition is used to set the root device, leading
  to error "File not found. You must load a kernel first..." while
  booting. update-grub should have instead used UUID of the partition
  kernel and initrd are on.

  The relevant part is in "/etc/grub.d/10_linux":
  <pre>
      50  if [ "x${GRUB_DEVICE_UUID}" = "x" ] || [ "x${GRUB_DISABLE_LINUX_UUID}" = "xtrue" ] \
      51      || ! test -e "/dev/disk/by-uuid/${GRUB_DEVICE_UUID}" \
      52      || [ "`grub-probe -t abstraction --device ${GRUB_DEVICE} | sed -e 's,.*\(lvm\).*,\1,'`" = "lvm"  ] ; then
      53    LINUX_ROOT_DEVICE=${GRUB_DEVICE}
      54  else
      55    LINUX_ROOT_DEVICE=UUID=${GRUB_DEVICE_UUID}
      56  fi
  </pre>

  This code should not refer to GRUB_DEVICE_UUID. It should refer to
  KERNEL_DEVICE_UUID instead.

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