[Bug 1814403] Re: Latest update causes 30 sec. menu delay timeout

[Luke]

I just encountered the issue that the parameter GRUB_TIMEOUT in
/etc/default/grub does not reduce the timeout for uefi boot anymore. I
was able to pinpoint the issue in the grub config to line 98 [1]. From
your issue here I understand that this is the way it is supposed to
work.

This should be documented somewhere as the documentation does not
mention that this setting does not work for uefi boot [2].

As a workaround you could edit /etc/grub.d/00_header to check in line
387 if the timeout is less than 5 [3].

[1]
/etc/default/grub ~
GRUB_TIMEOUT=5
/boot/grub/grub.cfg:98 ~
if [ $grub_platform = efi ]; then
  set timeout=30 # this value is the issue
  if [ x$feature_timeout_style = xy ] ; then
    set timeout_style=menu
  fi
fi

[2]
info -f grub -n 'Simple configuration' ~
'GRUB_TIMEOUT'
     Boot the default entry this many seconds after the menu is
     displayed, unless a key is pressed.  The default is '5'.  Set to
     '0' to boot immediately without displaying the menu, or to '-1' to
     wait indefinitely.

[3]
/etc/grub.d/00_header:387 ~
- set timeout=${GRUB_RECORDFAIL_TIMEOUT:-30}
+ set timeout=${$(if (( $GRUB_TIMEOUT < 5 )); then echo "5"; else echo "$GRUB_TIMEOUT"; fi):-30}

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https://bugs.launchpad.net/bugs/1814403

Title:
  Latest update causes 30 sec. menu delay timeout

Status in grub2 package in Ubuntu:
  Fix Released
Status in grub2-signed package in Ubuntu:
  Fix Released
Status in grub2 source package in Bionic:
  Fix Released
Status in grub2-signed source package in Bionic:
  Fix Released
Status in grub2 source package in Cosmic:
  Fix Released
Status in grub2-signed source package in Cosmic:
  Fix Released

Bug description:
  [SRU Justification]
  There is a behavior regression on non-EFI systems with the latest SRU of grub2 which causes unnecessary boot delays.

  [Test case]
  1. Install a system using BIOS mode with /boot on LVM.
  2. Reboot and verify that the boot menu is shown for 30 seconds at boot.
  3. Install grub* from -proposed.
  4. Reboot and verify that the boot menu is not shown.
  5. Install a system using UEFI mode with /boot on LVM.
  6. Reboot and verify that the boot menu is shown for 30 second at boot.
  7. Install grub* from -proposed.
  8. Reboot and verify that the boot menu is still shown.

  [Regression potential]
  The test case is sufficient to verify all possible paths work correctly after the SRU.

  
  KDEneon LTS user edition 5.12, Release 18.04

  grub-common 2.02-2ubuntu8.10 from Ubuntu updates

  Since latest update near the end of Jan. 2019 (29th?), grub menu has
  30 second delay every reboot as though recordfail is set. It did not
  do this before the update.

  After messing with grubenv and recordfails settings, I found this
  paragraph in 00_header in 18.04 that is not in 16.04:

  if lsefi; then
    set timeout=30
    if [ x$feature_timeout_style = xy ] ; then
      set timeout_style=menu
    fi
  fi

  Note "timeout=30" which is the same as the recordfail timeout. As a
  test, I edited /boot/grub/grub.cfg and changed the 30 to 17 and sure
  enough, that's the source of the timeout.

  Here's the paragraph from 00_header:

  if lsefi; then  set timeout=${GRUB_RECORDFAIL_TIMEOUT:-30}
    if [ x\$feature_timeout_style = xy ] ; then
      set timeout_style=menu
    fi
  fi

  One odd thing is the 00_header file is from Jan 9th but this bug has
  just appeared so it must be related to grub-common not the the header
  file.

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