[Bug 1229738] Re: grub doesn't boot with efi and md raid root

[Marcus Tomlinson]

This release of Ubuntu is no longer receiving maintenance updates. If
this is still an issue on a maintained version of Ubuntu please let us
know.

** Changed in: grub2 (Ubuntu)
       Status: Triaged => Incomplete

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Title:
  grub doesn't boot with efi and md raid root

Status in grub2 package in Ubuntu:
  Incomplete

Bug description:
  dick at reordberend:/tmp$ lsb_release -rd
  Description:	Ubuntu 12.04.3 LTS
  Release:	12.04

  dick at reordberend:/tmp$ apt-cache policy grub-efi-amd64
  grub-efi-amd64:
    Installed: 1.99-21ubuntu3.10
    Candidate: 1.99-21ubuntu3.10

  
  Installed 12.04.3 LTS Server using md raid1 for root partition on x86-64 box using EFI boot.

  
  Grub installs its EFI app correctly, and it launches at boot.  However, grub can't find the root partition.  Inspecting grub's config shows that it has prefix and root set to the EFI boot partition.  Manually setting those to the raid1 root partition at the grub prompt and running normal allows booting to proceed correctly (ie following the instructions at http://www.gnu.org/software/grub/manual/html_node/GRUB-only-offers-a-rescue-shell.html works).

  
  In EFI mode, grub seems to expect its grub.cfg and modules to be in the EFI partition.  However, they are all installed in the root filesystem.  The problem can be solved in the grub-install script by giving an embedded config to grub-mkimage (http://www.gnu.org/software/grub/manual/html_node/Embedded-configuration.html).  grub-install already has support for this, but it fails if the root partition is raided.

  Inside grub-install, if devabstraction_module is set (and with md as
  the root partition it will be) then config_opt_file is never set.  The
  attached patch solves the bug for me but will doubtless require
  refining to be generally applicable.

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