$ git clone -n https://src.fedoraproject.org/rpms/mysql-mmm.git /var/lib/mock/f42-build-side-1-3578364-46814/root/chroot_tmpdir/scmroot/mysql-mmm
Cloning into '/var/lib/mock/f42-build-side-1-3578364-46814/root/chroot_tmpdir/scmroot/mysql-mmm'...
$ git fetch origin 68283407487c96aa85cd4972490e4f8db8a9f312:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/mysql-mmm
 * [new ref]         68283407487c96aa85cd4972490e4f8db8a9f312 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6828340 Fix for RPM changed patch syntax