$ git clone -n https://src.fedoraproject.org/rpms/openshadinglanguage.git /var/lib/mock/f40-build-1179280-21865/root/chroot_tmpdir/scmroot/openshadinglanguage
Cloning into '/var/lib/mock/f40-build-1179280-21865/root/chroot_tmpdir/scmroot/openshadinglanguage'...
$ git fetch origin 3db67bda614c58aa1f159b38a1143ad5a1f32299:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/openshadinglanguage
 * [new ref]         3db67bda614c58aa1f159b38a1143ad5a1f32299 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3db67bd Update to 1.13.7.0 (rhbz#2261430)