Bug#486119: Proposed fix to update-grub_lib to stop unwanted 'search --fs-uuid'

[Jim Bray]

   I have just installed grub-pc version  1.96+20080621-1.

   My /etc/default/grub contains:

# Uncomment if you don't want GRUB to pass "root=UUID=xxx" parameter
to Linux
GRUB_DISABLE_LINUX_UUID=true

  'search --fs-uuid' lines should not be generated by update-grub, as I 
have the "GRUB_DISABLE_LINUX_UUID" option set.

   I propose the following change to update-grub_lib:

  # If there's a filesystem UUID that GRUB is capable of identifiing,
use it;
  # otherwise set root as per value in device.map.
  echo "set root=`${grub_probe} --device ${device} --target=drive`"
s/
if fs_uuid="`${grub_probe} --device ${device} --target=fs_uuid 
2/dev/null`" ; then
/
  if [ "x${GRUB_DISABLE_LINUX_UUID}" != "xtrue" ] && 
fs_uuid="`${grub_probe} --device ${device} --target=fs_uuid 2/dev/null`" 
; then
/

    echo "search --fs-uuid --set ${fs_uuid}"
  fi
}