$ git clone -n https://src.fedoraproject.org/rpms/cln.git /var/lib/mock/f45-build-4031-329/root/chroot_tmpdir/scmroot/cln
Cloning into '/var/lib/mock/f45-build-4031-329/root/chroot_tmpdir/scmroot/cln'...
$ git fetch origin 6b9d16c50f50a0eb5f8c0a0c58744fd2135d9d07:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/cln
 * [new ref]         6b9d16c50f50a0eb5f8c0a0c58744fd2135d9d07 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6b9d16c Update to 1.3.7 (rhbz#2259544)