Enable suppression of /EndEntire message

[Lauren Brock]

Many Ubuntu Core customers require a boot sequence that displays a custom splash image up until ubuntu-frame loads. Unfortunately, GRUB often (if not always) interrupts this process, printing two "/EndEntire" messages to the display. Ideally, this should be able to be suppressed via configuration, at least on devices running Ubuntu Core, as it likely desirable behavior on Classic systems.

[Mate Kukri (mkukri)]

Are you sure that this is printed by GRUB? I think it is systemd-stub that is printing this, which isn't used in classic at all.

[Lauren Brock (lauren-brock)]

Hi Mate,

Pretty certain -- I double-checked the systemd-stub codebase, and was unable to find "EndEntire" anywhere, but it definitely exists in GRUB:

lauren@gemini ~/w/grub2 (ubuntu/devel)> rg EndEntire
grub-core/kern/efi/efi.c
588: grub_printf ("/EndEntire\n");

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Mate Kukri (mkukri)]

Yeah looks like it is very much a grub thing

[Mate Kukri (mkukri)]

Looks like this is Oracular, Noble, Jammy and Focal job all in one.
One fix in Oracular, and 3 SRUs. I'm somewhat skeptical that this change fully satisfies SRU policy, but I'll try to make a case for this.

[Mate Kukri (mkukri)]

Ah the reason I thought this wasn't a thing is because *only* the chainloader command prints it, not the linux command, which GRUB 2.12 can use to boot UKIs....

Either way this message should be gated behind some kind of debug flag, so I am on it.

[Launchpad Janitor (janitor)]

This bug was fixed in the package grub2 - 2.12-5ubuntu4

---------------
grub2 (2.12-5ubuntu4) oracular; urgency=medium

  * Merge from Debian unstable; remaining changes:
    - Add Ubuntu sbat data
    - build-efi-images: do not produce -installer.efi.signed. LP #1863994
    - grub-common: Install canonical-uefi-ca.crt
    - Check signatures
    - Support installing to multiple ESP (LP #1871821)
    - Split out unsigned artefacts into grub2-unsigned
    - Vcs-Git: Point to ubuntu packaging branch
    - Relax dependencies on grub-common and grub2-common
    - UBUNTU: Do not link grub-efi-*-unsigned docs to grub-common
    - UBUNTU: Default timeout changes
    - UBUNTU: Replace grub-install-extra-removable
    - UBUNTU: Revert "Add jfs module to signed UEFI images. Closes: #950959"
    - UBUNTU: Revert "Add f2fs module to signed UEFI images"
    - UBUNTU: Drop luks2
    - Install grub-initrd-fallback.service again
    - Build using -O1 on s390x to avoid misoptimization
    - grub-check-signatures: Support gzip compressed kernels
    - forward port fix for LP #1926748
    - Forward port the fix for LP #1930742 and make it conditional (xenial/bionic only)
    - Build grub2-unsigned packages with xz compression
    - Drop i386 from grub-efi-amd64*
    - Turn depends on grub-efi-amd64/arm64 unversioned
    - Revert "Have -bin packages Break pre-2.12 -signed packages"
    - Install grub-sort-version
    - rules: Add DPKG_BUILDPACKAGE_OPTIONS to generate-grub2-unsigned
    - d/postinst.in: Make empty "grub-pc/install_devices" non-fatal in "noninteractive" mode
    - Add debconf options "grub-{efi,pc}/cloud_style_installation"
    - grub-common.service: Add After/Requires=boot-complete.target (LP #1992643)
    - d/postinst.in: Remove upgrade check for GRUB version we can no longer upgrade from
    - Removed patches:
      + install-signed.patch with
      + grub-install-extra-removable.patch
      + grub-install-removable-shim.patch
    - Added patches:
      + ubuntu-install-signed.patch
      + ubuntu-grub-install-extra-removable.patch
      + ubuntu-zfs-enhance-support.patch
      + ubuntu-zfs-mkconfig-ubuntu-recovery.patch
      + ubuntu-zfs-mkconfig-ubuntu-distributor.patch
      + ubuntu-zfs-mkconfig-signed-kernel.patch
      + ubuntu-zfs-gfxpayload-keep-default.patch
      + ubuntu-zfs-gfxpayload-dynamic.patch
      + ubuntu-zfs-vt-handoff.patch
      + ubuntu-zfs-mkconfig-recovery-title.patch
      + ubuntu-zfs-insmod-xzio-and-lzopio-on-xen.patch
      + ubuntu-support-initrd-less-boot.patch
      + ubuntu-shorter-version-info.patch
      + ubuntu-add-initrd-less-boot-fallback.patch
      + ubuntu-mkconfig-leave-breadcrumbs.patch
      + ubuntu-fix-lzma-decompressor-objcopy.patch
      + ubuntu-add-devicetree-command-support.patch
      + ubuntu-boot-from-multipath-dependent-symlink.patch
      + ubuntu-resilient-boot-ignore-alternative-esps.patch
      + ubuntu-resilient-boot-boot-order.patch
      + ubuntu-speed-zsys-history.patch
      + ubuntu-dont-verify-loopback-images.patch
      + ubuntu-recovery-dis_ucode_ldr.patch
      + ubuntu-add-initrd-less-boot-messages.patch
      + rhboot-f34-make-exit-take-a-return-code.patch
      + rhboot-...