$ git clone -n https://src.fedoraproject.org/rpms/fast-cdr.git /var/lib/mock/f40-build-2207842-52101/root/chroot_tmpdir/scmroot/fast-cdr
Cloning into '/var/lib/mock/f40-build-2207842-52101/root/chroot_tmpdir/scmroot/fast-cdr'...
$ git fetch origin ac13ea97a092c5ce320ead47c361f704d6e004b9:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/fast-cdr
 * [new ref]         ac13ea97a092c5ce320ead47c361f704d6e004b9 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ac13ea9 Add gtest dep