group.of.nepali.translators team mailing list archive

[Steve Langasek <steve.langasek@xxxxxxxxxxxxx>]

Hello Chris, or anyone else affected,

Accepted grub2-signed into xenial-proposed. The package will build now
and be available at
https://launchpad.net/ubuntu/+source/grub2-signed/1.66.8 in a few hours,
and then in the -proposed repository.

Please help us by testing this new package.  See
https://wiki.ubuntu.com/Testing/EnableProposed for documentation on how
to enable and use -proposed.Your feedback will aid us getting this
update out to other Ubuntu users.

If this package fixes the bug for you, please add a comment to this bug,
mentioning the version of the package you tested, and change the tag
from verification-needed to verification-done. If it does not fix the
bug for you, please add a comment stating that, and change the tag to
verification-failed.  In either case, details of your testing will help
us make a better decision.

Further information regarding the verification process can be found at
https://wiki.ubuntu.com/QATeam/PerformingSRUVerification .  Thank you in
advance!

** Also affects: grub2-signed (Ubuntu)
   Importance: Undecided
       Status: New

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

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https://bugs.launchpad.net/bugs/1640878

Title:
  grub2 cannot currently generate configuration without initrd

Status in grub2 package in Ubuntu:
  Fix Released
Status in grub2-signed package in Ubuntu:
  Fix Released
Status in grub2 source package in Xenial:
  Fix Committed

Bug description:
  As it currently stands grub2 cannot create grub.cfg menu entries that do not use an initrd image if one is present but the user does not desire to use it.
  Furthermore, root= entries only support UUID and LABEL, but neither is an option if booting the kernel without an initrd.

  Suggestion:

  Allow grub2 to create configuration files without an "initrd" line and
  passing PARTUUID as root= entry by adding configuration knobs.

  [SRU Justification]
  A lot of time is wasted across the many, many instances of Ubuntu loading initramfs when booting.  It's a measurable savings of CPU time and electricity to skip loading an initramfs at boot if it's not required.

  [Test case]
  1. cp /boot/grub/grub.cfg /tmp/grub.cfg
  2. install the grub packages from -proposed.
  3. cmp /boot/grub/grub.cfg /tmp/grub.cfg || echo 'fail'
  4. as root, configure /etc/default/grub to mount the root disk directly and bypass the initramfs:
    echo GRUB_DISABLE_INITRD=true >> /etc/default/grub
    root=$(awk </etc/fstab '$2 == "/" { print $1 }')
    case $root in
        LABEL=*|UUID=*)
            dev="-l -t $root"
            ;;
        *)
            dev=$root
            ;;
    esac
    partuuid=$(blkid -s PARTUUID -o value $dev)
    if [ -z "$partuuid" ]; then
        echo "Error: cannot get partuuid for $root."
    else
        echo GRUB_FORCE_PARTUUID=$partuuid >> /etc/default/grub
    fi
  5. If a partuuid has been found, run update-grub.  Note that this will only work if your root device is a partition on a GPT-formatted disk.
  6. Check that /boot/grub/grub.cfg now contains entries that don't specify an initramfs, and do include root=PARTUUID=* on the kernel commandline.

  [Regression potential]
  This upload introduces no behavior changes unless the user updates /etc/default/grub to configure the use of the new feature, so there should be no regressions here.  The SRU test case verifies that /boot/grub/grub.cfg remains unchanged with the new version.

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