[Bug 1882794] Re: do-release-upgrade should allow other tools to block or warn before upgrades

[Nick Rosbrook]

** Changed in: ubuntu-release-upgrader (Ubuntu)
       Status: New => Invalid

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https://bugs.launchpad.net/bugs/1882794

Title:
  do-release-upgrade should allow other tools to block or warn before
  upgrades

Status in ubuntu-release-upgrader package in Ubuntu:
  Invalid

Bug description:
  do-release-upgrade should allow other tools to block or warn before it
  proceeds.

  A few use cases for this:

   1) Juju managed machines - Juju requires the user to run
      'upgrade-series X prepare' before the upgrade starts.  This allows
      charms running on the machine to prepare for the upcoming Ubuntu upgrade.

   2) Paranoid/careful sysadmins (c.f. the 'molly-guard' package)

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