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

[James Troup]

Public bug reported:

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)

** Affects: ubuntu-release-upgrader (Ubuntu)
     Importance: Undecided
         Status: New

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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:
  New

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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