Downgrading packages after removing a repository

[C de-Avillez]

On Thu, 2009-08-06 at 01:08 +0300, Dmitrijs Ledkovs wrote:
> 2009/8/1 Andrew Sayers <andrew-ubuntu-devel at pileofstuff.org>:
> > When you add a repository to your computer, then remove that repository,
> > it's not obvious how to downgrade packages that are no longer available.
> >
> 
> https://edge.launchpad.net/~xorg-edgers/+archive/ppa/+files/ppa-purge_0.2.2~jaunty.dsc
> 
> Removes a ppa and downgrades that was pulled from it.
> 
> AWESOME =)

Indeed Dima!

Seb had also pointed me to it today. But, still, Michael's observations
still apply: we must be careful on downgrading, pretty much like we are
careful when upgrading, possibly even more: differences on configuration
files, or how data is handled, may cause serious problems.

It *is* possible, and the ppa-purge script shows it. But... much more
care will have to be taken to get from this point to something that can
be provided to not-so-experienced-users-if-at-all.

But I was really happy to see that we (up to now, Andrew, Michael,
myself, and you; well, and Sebastien) were not the only ones thinking
about it (even if Seb, like Michael, is unsure).

Hell, *I* am unsure! But it would really be nice. In my case, I am
usually on the road, so I only have my personal laptop as a testbed.
Being able to test/try something, and revert back with minimal effort,
is a really good gain.

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