Automatically purging non-official packages

[Nikolaus Rath <Nikolaus@rath.org>]

Hello,

Ubuntu has a "ppa-purge" script that not just removes Launchpad PPAs
from sources.list, but also automatically reverts any packages installed
from that PPA to the versions available in the official archives.

Has anyone ever written something similar for Debian? I'm thinking of a
script that deletes all packages that are not retrievable from any of
the registered sources, and downgrades (or upgrades) all packages to the
most recent version available.


Best,

   -Nikolaus

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