$ git clone -n https://src.fedoraproject.org/rpms/polymake.git /var/lib/mock/f45-build-53659-928/root/chroot_tmpdir/scmroot/polymake
Cloning into '/var/lib/mock/f45-build-53659-928/root/chroot_tmpdir/scmroot/polymake'...
$ git fetch origin c8c4a19558eeea91291ec17e35070fbcf331e139:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/polymake
 * [new ref]         c8c4a19558eeea91291ec17e35070fbcf331e139 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c8c4a19 Rebuild for scip 10.1.0