[Bug 1747499] Re: 98-reboot-required and Interaction with livepatch

[Thijs Cadier]

Chiming in a a potential customer:

I can't figure out how to check when a reboot is required when using
livepatch. For example, at the moment a machine I'm testing on has only
"linux-base" in /var/run/reboot-required.pkgs.

Livepatch status says: "patch state: ✓ no livepatches needed for this
kernel yet".

Do I need to reboot now? I can't figure that out. It would be really
helpful if the full decision tree for this was documented.

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https://bugs.launchpad.net/bugs/1747499

Title:
  98-reboot-required and Interaction with livepatch

Status in update-notifier package in Ubuntu:
  Confirmed

Bug description:
  If a system is using canonical livepatch, has it enabled, and patches
  are applied, it could be confusing for a user to receive a "system
  restart required" messages in the MOTD when logging in.

  That message, when present, is printed by 98-reboot-required which
  essentially just cats /var/run/reboot-required to stdout. That file is
  placed by packages that require a reboot so that they are properly
  used in their updated versions. Examples that come to mind are libc
  and the kernel.

  There is a secondary file that can be created which says which
  packages requested the reboot. That would be /var/run/reboot-
  required.pkgs

  Ideally that script should not print out the reboot required message
  if a) livepatch is installed and enabled; b) the only trigger for the
  reboot is a kernel update.

  For (a), one can use the command "ubuntu-advantage is-livepatch-
  enabled" and check $?. That is in the ubuntu-advantage-tools package.

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