[Bug 1060404] Re: update-grub runs and fails in containers

[Serge Hallyn]

@Andreas,

it needs to be fixed in grub.  However the fix in raring should be
SRUable.

** Changed in: grub2 (Ubuntu Precise)
   Importance: Undecided => High

** No longer affects: upstart (Ubuntu)

** No longer affects: upstart (Ubuntu Precise)

** No longer affects: upstart (Ubuntu Quantal)

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Title:
  update-grub runs and fails in containers

Status in “grub2” package in Ubuntu:
  Fix Released
Status in “lxc” package in Ubuntu:
  Fix Released
Status in “grub2” source package in Precise:
  Confirmed
Status in “lxc” source package in Precise:
  Triaged
Status in “grub2” source package in Quantal:
  Fix Released
Status in “lxc” source package in Quantal:
  Fix Released

Bug description:
  [XXX edit - removed the SRU justification for lxc part.  The proposed solution
  was not safe, and was undone in a later commit.  devtmpfs cannot be mounted
  in a container, because changes under the container's /dev are then
  reflected in the host's /dev.

  If grub is installed in a container (as happens, for instance, with
  the ubuntu-cloud template) then an update of grub or linux-image will
  cause update-grub to be run.  It tries, finds it can't access the root
  device, fails, and causes the update to fail.

  It would be better for update-grub to detect that it is in a container
  and simply exit 0, so that the apt-get can succeed.  I'm attaching a
  debdiff which does that.

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