[Bug 1907085] Re: Regression in backup-and-restore patch.

[Łukasz Zemczak]

Hello Dimitri, or anyone else affected,

Accepted grub2 into groovy-proposed. The package will build now and be
available at https://launchpad.net/ubuntu/+source/grub2/2.04-1ubuntu35.2
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, what testing has been
performed on the package and change the tag from verification-needed-
groovy to verification-done-groovy. If it does not fix the bug for you,
please add a comment stating that, and change the tag to verification-
failed-groovy. In either case, without details of your testing we will
not be able to proceed.

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

N.B. The updated package will be released to -updates after the bug(s)
fixed by this package have been verified and the package has been in
-proposed for a minimum of 7 days.

** Changed in: grub2 (Ubuntu Groovy)
       Status: New => Fix Committed

** Tags added: verification-needed verification-needed-groovy

** Changed in: grub2 (Ubuntu Focal)
       Status: New => Fix Committed

** Tags added: verification-needed-focal

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https://bugs.launchpad.net/bugs/1907085

Title:
  Regression in backup-and-restore patch.

Status in grub2 package in Ubuntu:
  Fix Released
Status in grub2 source package in Bionic:
  New
Status in grub2 source package in Focal:
  Fix Committed
Status in grub2 source package in Groovy:
  Fix Committed
Status in grub2 source package in Hirsute:
  Fix Released

Bug description:
  [Impact]

   * A regression was identified in the backup & restore patch on some
  architectures, which results in garbage filenames to be created in
  /boot/grub.

  The issue is reported on linux-ext4 mailing list https://marc.info/?l
  =linux-ext4&m=160709231522785&w=2

  [Test Case]

   * Execute grub-install --target pc-i386 on i386 machine against a
  nonexistent drive. Such that, backup & restore is triggered.

   * Observe that the restored modules names in /boot/grub do not have
  garbage file endings.

  [Where problems could occur]

   * The generated garbage file endings will remain on disk across
  future upgrade and will need to be cleaned up manually. I am pondering
  if I can clean them up somehow automatically. However the scope of the
  affected machines should be very small and limited to i386.

  [Other Info]
   
   * Reported on linux-ext4 mailing list & debugged by / patch provided by colin watson.

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