[Bug 1843288] Re: grub-ieee1275 installs to an arbitrary PReP partition when more than one is available

[Launchpad Bug Tracker]

** Merge proposal unlinked:
   https://code.launchpad.net/~legovini/curtin/+git/curtin/+merge/369085

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https://bugs.launchpad.net/bugs/1843288

Title:
  grub-ieee1275 installs to an arbitrary PReP partition when more than
  one is available

Status in grub2 package in Ubuntu:
  New

Bug description:
  When the grub-ieee1275 package is installed or upgraded the grub-
  ieee1275.postinst script uses the prep-bootdev helper to find a PReP
  partition to install grub to via grub-install. When there is a single
  PReP partition on the system this is fine, however when more than one
  is present it's difficult to tell which one prep-bootdev will pick,
  and if it will always pick the same one.

  We hit this on a test system where the partition layout is the one in
  the attached file. As you can see there are two PReP partitions:

  Device        Start      End Sectors Size Type
  /dev/vda4  10487808 10504191   16384   8M PowerPC PReP boot

  Device       Start     End Sectors Size Type
  /dev/vde2  2099200 2115583   16384   8M PowerPC PReP boot

  In this case prep-bootdev chose /dev/vde2 to install grub to. This was
  unexpected.

  I don't have a sensible alternative to propose here, as we want to
  keep grub guessing what is reasonable to guess and we don't want to
  break existing systems or workflows. Still the current behavior is
  less than ideal.

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