[Bug 1791370] Re: update database on each boot, not just on package install

[Julian Andres Klode]

Patch for review

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https://bugs.launchpad.net/bugs/1791370

Title:
  update database on each boot, not just on package install

Status in secureboot-db package in Ubuntu:
  In Progress

Bug description:
  Currently the secureboot databases are only updated at the time the
  secureboot-db package is installed or upgraded, but this may not be
  the point in time that the firmware needs to be updated.

  - New OS install: the secureboot-db package was installed during the image mastering, not when Ubuntu is written to the target disk.
  - Package installed while the system is booted in BIOS mode, later switched to UEFI mode
  - Hard drive moved to a new computer which doesn't yet have the updates

  We should ship a systemd unit to re-apply these revocations as
  necessary on each boot.

  The unit should be
  ConditionPathExists=/sys/firmware/efi/efivars/db-d719b2cb-3d3a-4596-a3bc-dad00e67656f

  (don't use dbx for the condition, since if dbx is empty this variable
  may be absent.)

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