2010/8/6 Jax cybercorecentre@gmail.com:
We won't release the code since it's not GPL
Regards, Wikipedia Staff
This person is not associated with WMF in any way, so please ignore their message.
The code that creates the tarballs is right there in ExtensionDistributory_body.php , line 208 and below. Simply grepping the source for 'tar' would've shown that.
Interestingly, none of the ExtensionDistributor files have GPL headers. This should probably be fixed.
Roan Kattouw (Catrope)