$ git clone -n https://src.fedoraproject.org/rpms/openshadinglanguage.git /var/lib/mock/f39-build-1807317-41825/root/chroot_tmpdir/scmroot/openshadinglanguage
Cloning into '/var/lib/mock/f39-build-1807317-41825/root/chroot_tmpdir/scmroot/openshadinglanguage'...
$ git fetch origin dd80c4b0d3d06085855ec613607341cf5d41af53:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/openshadinglanguage
 * [new ref]         dd80c4b0d3d06085855ec613607341cf5d41af53 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at dd80c4b Update to 1.12.14.0 (rhbz#2247779)