$ git clone -n https://src.fedoraproject.org/rpms/libre.git /var/lib/mock/f41-build-826530-154920/root/chroot_tmpdir/scmroot/libre
Cloning into '/var/lib/mock/f41-build-826530-154920/root/chroot_tmpdir/scmroot/libre'...
$ git fetch origin 79eb33b206969bb117e0cdfafae7075ed09d1891:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libre
 * [new ref]         79eb33b206969bb117e0cdfafae7075ed09d1891 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 79eb33b Upgrade to 3.14.0 (#2299504)