Getting a stable virtual env

[P J]

Hi ppl,

I'm trying to figure out the whole virtualenv story.
Right now I'm using it to creating an environment for our upcoming debian
upgrade to squeeze.

I'm doing some tests in our current distrib (python 2.5).
I have come to realize that a lot of packages in the version I'm interested
in are not available anymore on pypi. The pip installer fails a lot.

Squeeze features python 2.7 so I'm pretty sure that everything will work
fine. I've actually tested it. The question is, how do I protect myself
from future package removal ?
Do I absolutely need to run a local pypi server (I've seen some python
package doing this), and mirror all the packages I'm interested in ?

cheers,

JM
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