$ git clone -n https://src.fedoraproject.org/rpms/python-jupymake.git /var/lib/mock/f41-build-side-1-3012220-36868/root/chroot_tmpdir/scmroot/python-jupymake
Cloning into '/var/lib/mock/f41-build-side-1-3012220-36868/root/chroot_tmpdir/scmroot/python-jupymake'...
$ git fetch origin 5b73a4e67bde13a18f6ebfed2ecaa18ab5042669:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/python-jupymake
 * [new ref]         5b73a4e67bde13a18f6ebfed2ecaa18ab5042669 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5b73a4e Rebuild for polymake 4.13