$ git clone -n https://src.fedoraproject.org/rpms/polymake.git /var/lib/mock/f41-build-858977-168512/root/chroot_tmpdir/scmroot/polymake
Cloning into '/var/lib/mock/f41-build-858977-168512/root/chroot_tmpdir/scmroot/polymake'...
$ git fetch origin 7c36fb8e622705f8f4b5ca49772bd8b9f9c15ddd:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/polymake
 * [new ref]         7c36fb8e622705f8f4b5ca49772bd8b9f9c15ddd -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 7c36fb8 Rebuild for normaliz 3.10.4