$ git clone -n https://src.fedoraproject.org/rpms/polymake.git /var/lib/mock/f40-build-2630332-65651/root/chroot_tmpdir/scmroot/polymake
Cloning into '/var/lib/mock/f40-build-2630332-65651/root/chroot_tmpdir/scmroot/polymake'...
$ git fetch origin f7c0a6396eb5ed8eebe4ba74d463ceae284d6629:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/polymake
 * [new ref]         f7c0a6396eb5ed8eebe4ba74d463ceae284d6629 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f7c0a63 Rebuild for flint 3.1.0, soplex 7.0.0, and scip 9.0.0