[Bug 1729034] Re: don't short-circuit update-grub kernel postinst hook in containers

[Steve Langasek]

prelim feedback is that update-grub does still fail in a lxd container
with a stock setup; so we will need to work around this in livecd-rootfs
instead.

** Package changed: grub2 (Ubuntu) => livecd-rootfs (Ubuntu)

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https://bugs.launchpad.net/bugs/1729034

Title:
  don't short-circuit update-grub kernel postinst hook in containers

Status in livecd-rootfs package in Ubuntu:
  Fix Committed
Status in livecd-rootfs source package in Xenial:
  New

Bug description:
  LP: #1060404 was addressed by making the update-grub kernel postinst
  hook a no-op when running in containers.

  We now do all of our livefs builds in containers in Launchpad; this
  means livefses no longer get a grub config automatically generated
  with the correct contents when installing a kernel in the target, as
  they did previously.

  The change for LP: #1060404 was described by Colin as a "temporary
  fix".

  We know that update-grub itself now succeeds in containers, because we
  have several points in livefs builds where we are invoking it directly
  and it does what we expect.

  We should check that running update-grub in a stock lxd container
  works as expected, and that this isn't due to some sort of launchpad
  sauce.  Provided it does work, we should remove the container check
  from the kernel postinst hook.

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