[packagekit] Privileges handling in complex situations

[Sebastian Heinlein]

Hello,

The Simulate* methods now allow to preview complex transactions, which
e.g. require additional removals next to an installation.

But how should we handle the privileges?

Here are some use cases:

- User is allowed to install, but not to remove software. User
  wants to install postfix, which would remove exim.

  How should the backend know about the missing privilege?

- User A and B are allowed to install software. User A queues an
  installation, e.g. exim. User B also queues an installation shortly
  before the previous installation was processed, e.g. postfix. 

  Currently privileges are only checked at transaction init time, but
  not afterwards anymore.

How do you plan to solve this in your aptcc backend, Dantti?

Cheers,

Sebastian

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