centos mockbuild mock usreのメモ。というか、引用。

http://wiki.centos.org/FAQ/General/RebuildReleaseProcess

CentOS uses a mock buildroot environment (a separate chroot for each package), not unlike what is being done for Fedora or Scientific Linux. 
SL has been reported to use mock directly. Fedora uses mock with a program called koji CentOS uses mock via a program called plague All 3 solutions produce the same type of RPMS as rpmbuild is the underlying builder in each instance.

chrootと関係ないもので、Fedore または、Scientific Linux と似てなくないものが、使う？

rootの代わりにつかわれるらしい。