$ git clone -n https://src.fedoraproject.org/rpms/polymake.git /var/lib/mock/f41-build-817040-150576/root/chroot_tmpdir/scmroot/polymake
Cloning into '/var/lib/mock/f41-build-817040-150576/root/chroot_tmpdir/scmroot/polymake'...
$ git fetch origin 0739d8171983713f9a5df7215c75c6f46456d0a7:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/polymake
 * [new ref]         0739d8171983713f9a5df7215c75c6f46456d0a7 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 0739d81 Rebuild for soplex 7.1.0 and scip 9.1.0