$ git clone -n https://src.fedoraproject.org/rpms/python-jupymake.git /var/lib/mock/f41-build-814840-149211/root/chroot_tmpdir/scmroot/python-jupymake
Cloning into '/var/lib/mock/f41-build-814840-149211/root/chroot_tmpdir/scmroot/python-jupymake'...
$ git fetch origin 7f82c41cd0e9276896d39f535387284407c45df1:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/python-jupymake
 * [new ref]         7f82c41cd0e9276896d39f535387284407c45df1 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 7f82c41 Rebuild for polymake 4.12