[Bug 1067332] [NEW] 'dkpg-reconfigure' conflates user existing for vhost existing

[John A Meinel]

Public bug reported:

If something happens and you delete the rabbitmq user 'maas_workers' or
the vhost '/mass_workers' and then run 'dpkg-reconfigure' to fix things.

However, the test in postinst is 'if user exists: change_user_password()
else: create user, create vhost, set permissions on vhost".

Which means that if you delete the user, then it tries to create a vhost
that may already exist. Or if you delete the vhost, then it doesn't
recreate it if the user exists.

** Affects: maas (Ubuntu)
     Importance: Undecided
         Status: New

** Also affects: maas (Ubuntu)
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1067332

Title:
  'dkpg-reconfigure' conflates user existing for vhost existing

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