[Bug 1894824] Update Released

[Steve Langasek]

The verification of the Stable Release Update for grub2-signed has
completed successfully and the package is now being released to
-updates.  Subsequently, the Ubuntu Stable Release Updates Team is being
unsubscribed and will not receive messages about this bug report.  In
the event that you encounter a regression using the package from
-updates please report a new bug using ubuntu-bug and tag the bug report
regression-update so we can easily find any regressions.

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https://bugs.launchpad.net/bugs/1894824

Title:
  compare grub efi during build

Status in grub2-signed package in Ubuntu:
  Fix Released
Status in grub2-signed source package in Focal:
  Fix Released
Status in grub2-signed source package in Groovy:
  Fix Released

Bug description:
  [Impact]

   * When resigning grub in a PPA, one can satisfy the build-depends from the main Ubuntu Archive, without PPA signature ready yet.
   * In such cases, grub2-signed is missbuilt with signature from an old PPA build attached to a newer binary, resulting in validation errors.
   * Add a check to ensure that signed grub & build-depends grub are the same

  [Test Case]

   * Copy grub2 from -updates into PPA and await signing
   * Copy grub2-signed from Ubuntu Archive -proposed into PPA
   * Observe that grub2-signed FTBFS, instead of successfully producing uninstallable/unverifiable debs
   * Copy grub2 from -proposed into PPA, and await signing
   * Retry grub2-signed build, which should now succeed

  [Regression Potential]

   * Only a build-time quickcheck is added, without any other changes of
  how signed grub efi images are assembled.

  [Other Info]
   
   * Previously this issue resulted in miss built UC20 grub copies

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