$ git clone -n https://src.fedoraproject.org/rpms/highfive.git /var/lib/mock/f40-build-2146151-50883/root/chroot_tmpdir/scmroot/highfive
Cloning into '/var/lib/mock/f40-build-2146151-50883/root/chroot_tmpdir/scmroot/highfive'...
$ git fetch origin 39e67e0689444c53ae440116c7b798788e3200f1:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/highfive
 * [new ref]         39e67e0689444c53ae440116c7b798788e3200f1 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 39e67e0 Update to 2.8.0 (close RHBZ#2247726)