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Re: private debian pools

On Mon, 2002-12-09 at 02:09, Nick Phillips wrote:

> On Monday, December 9, 2002, at 12:03  pm, Scott James Remnant wrote:
> > I disagree that this is needed, not for any of the usual reasons, but
> > for the simple reason that this functionality already exists.
> In part; it's not visible to the user, and it's not possible for a 
> package to specify that it depends on a version of a package from a 
> particular release/distribution/origin.
It's entirely visible to the user!

When all else fails, apt-cache policy tells you everything you might
want in your preferences file.

> > The namespace of an apt repository is its URL, and any information
> > available in a "Release" file at that URL.
> Which is inadequate; how do you tell whether the following lines access 
> the same
> distribution?
> deb http://debian.lemon-computing.com/debian/ stable main contrib 
> non-free
> deb http://debian.otago.ac.nz/debian/ stable main contrib non-free
A "Release" file is present for both distributions, in which the
following line exists:

	Origin: Debian

Then you can put something like:

	Pin: release o=Debian

in your preferences file to refer to it.  If Origin were "Ximian" for
example, you'd put this instead:

	Pin: release o=Ximian

> > I imagine the problem you had was that the system had all the Ximian
> > GNOME debs installed, and you wanted to use those from Debian instead.
> > That could have been easily solved by putting the following in
> > /etc/apt/preferences:
> > 	Package: *
> > 	Pin: release o=Debian
> > 	Pin-Priority: 1000
> >
> > 	Package: *
> > 	Pin: origin ftp.ximian.com
> > 	Pin-Priority: -1
> >
> > In effect, "Debian packages can force a downgrade of anything, do not
> > consider Ximian packages for installation at all"
> This is great, but it doesn't enable *packages* to specify what they 
> need. Which is where the logic needs to be, if we really want to avoid 
> problems.
Why?  I would say that this is the last thing you want to do?  A package
shouldn't care that Ximian's version of libgal is installed, just that
"libgal" is installed - I (as the user) should then be able to choose
which package I install.

Scott James Remnant     Have you ever, ever felt like this?  Had strange
http://netsplit.com/      things happen?  Are you going round the twist?

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