$ git clone -n https://src.fedoraproject.org/rpms/polymake.git /var/lib/mock/f40-build-795643-140214/root/chroot_tmpdir/scmroot/polymake
Cloning into '/var/lib/mock/f40-build-795643-140214/root/chroot_tmpdir/scmroot/polymake'...
$ git fetch origin d5e8dc8aa1563205a880879e0a2f4c990ee02fbb:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/polymake
 * [new ref]         d5e8dc8aa1563205a880879e0a2f4c990ee02fbb -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d5e8dc8 Build with soplex and scip support