[Bug 1271141] Re: 30_os-prober fails in make_timeout() when using GRUB_BUTTON_CMOS_ADDRESS

[Colin Watson]

Could you try 2.02~beta2-*, now in trusty?  The timeout code looks
rather different there, and shouldn't suffer from this.

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https://bugs.launchpad.net/bugs/1271141

Title:
  30_os-prober fails in make_timeout() when using
  GRUB_BUTTON_CMOS_ADDRESS

Status in “grub2” package in Ubuntu:
  Triaged

Bug description:
  I've been configuring the alternate OS boot functionality and
  discovered that "30_os-prober" causes a syntax error in the generated
  "grub.cfg.new" when GRUB_BUTTON_CMOS_ADDRESS is defined. The bad
  generated code is:

  if cmostest 85:3; then
  else
  fi

  It is obviously missing any statements inside the conditional blocks.

  The cause  is make_timeout() only generating output when
  "$found_other_os" is empty. In the case of using
  GRUB_BUTTON_CMOS_ADDRESS its entire purpose is to use the alternative
  OS boot button that some PCs have.

  I'll do a merge request later but the quick-fix to "/etc/grub/30_os-
  prober" is:

  make_timeout() {
    if [ "x${found_other_os}" = "x" -o "x${GRUB_BUTTON_CMOS_ADDRESS}" != "x" ]; then

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