$ git clone -n https://src.fedoraproject.org/rpms/python-jupymake.git /var/lib/mock/f38-build-side-42-init-devel-1035304-29746/root/chroot_tmpdir/scmroot/python-jupymake
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-1035304-29746/root/chroot_tmpdir/scmroot/python-jupymake'...
$ git fetch origin c5607466d7b17402b38212f64b5a522c072e0875:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/python-jupymake
 * [new ref]         c5607466d7b17402b38212f64b5a522c072e0875 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c560746 Rebuild for polymake 4.10