[Merge] ~xypron/grub:efivarfs into ~ubuntu-core-dev/grub/+git/ubuntu:ubuntu

[Heinrich Schuchardt]

Heinrich Schuchardt has proposed merging ~xypron/grub:efivarfs into ~ubuntu-core-dev/grub/+git/ubuntu:ubuntu.

Commit message:
efivar: check that efivarfs is writeable

Some UEFI implementations (notably U-Boot) don't implement the 
SetVariable() runtime service. On these systems the GRUB installation
must be completed manually. Write a warning in this case but avoid
throwing an error.

Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt at canonical.com>

Requested reviews:
  Ubuntu Core Development Team (ubuntu-core-dev)

For more details, see:
https://code.launchpad.net/~xypron/grub/+git/grub/+merge/417181
-- 
Your team Ubuntu Core Development Team is requested to review the proposed merge of ~xypron/grub:efivarfs into ~ubuntu-core-dev/grub/+git/ubuntu:ubuntu.
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