[Bug 1549064] Re: grub-ieee1275 should not change boot-device for every upgrade

[Mathieu Trudel-Lapierre]

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

** Changed in: grub2-signed (Ubuntu Trusty)
       Status: New => In Progress

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https://bugs.launchpad.net/bugs/1549064

Title:
  grub-ieee1275 should not change boot-device for every upgrade

Status in grub2 package in Ubuntu:
  In Progress
Status in grub2-signed package in Ubuntu:
  New
Status in grub2 source package in Trusty:
  Fix Committed
Status in grub2-signed source package in Trusty:
  In Progress

Bug description:
  [Impact]
  This affects all ppc64el users whenever they upgrade grub.

  [Test case]
  1) run 'nvram --print-config=boot-device'
  2) upgrade grub-ieee1275
  2) run 'nvram --print-config=boot-device'

  The value should not change between runs, it should also not be touched at all (even if it's set to the same value).
  This can be further verified by modifying boot-device to an arbitrary value before running the grub upgrade.

  [Regression potential]
  This has minimal potential for regression. It removes a code path which might otherwise break booting after upgrading grub on the affected systems. One possibility for regression is that if code paths are subsequently added to register openfirmware devices, this should be guarded with an 'if (update_nvram)' test to make sure it only ever happens when the --no-nvram flag is *NOT* passed to grub-install.

  ---

  grub-ieee1275 should call grub-install with --no-nvram in postinst, so
  as not to modify boot-device in OpenFirmware everytime the grub
  package is updated.

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