mock and sgid basedir

[Mike McLean]

It seems that mock currently requires /var/lib/mock to be sgid mock, at 
least when run by mortal users. I know that older (perhaps much older) 
versions of mock did not require this.

I have previously seen problems where the sgid bit on directories could 
propagate into built packages. However, a casual attempt to recreate 
this fails. Perhaps there has been a fix in rpm for this. Does anyone 
know for sure?