composer/composer — pull request #1338 by chEbba (2012-11-18 20:58:17+00:00)
Title: Use local mirror of git repository in GitDownloader

Simple Implementation of #1323

Clone repository from mirrored local one instead of remote.

I tested few scenarios and got the following results on my linux VM with symfony-standard dev project:
* current composer version: ~196s for composer install
* mirror + reference: ~57s
* mirror + direct clone from mirror: ~25s

Does anyone see any drawbacks of this type of solution?
Any comments about using GitDriver in downloader?