Hi,
I just released new version of Mock.
The release notes:
https://fedoraproject.org/wiki/1.2.15
Biggest changes:
* Fedora 24 chroot configs (and Fedora 21 was removed).
* ccache plugin is by default off - to copy behavior of Koji and Copr.
* ~/.config/mock.cfg is parsed too (beside ~/.mock/user.cfg).
Mirek