$ git clone -n https://src.fedoraproject.org/rpms/libdnf.git /var/lib/mock/f40-build-1932761-25125/root/chroot_tmpdir/scmroot/libdnf
Cloning into '/var/lib/mock/f40-build-1932761-25125/root/chroot_tmpdir/scmroot/libdnf'...
$ git fetch origin 78712a4c0e0ad98e9ffeb9789e2fad37bcf65452:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libdnf
 * [new ref]         78712a4c0e0ad98e9ffeb9789e2fad37bcf65452 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 78712a4 Update to 0.73.2