$ git clone -n https://src.fedoraproject.org/rpms/python-graph-tool.git /var/lib/mock/f40-build-731381-103859/root/chroot_tmpdir/scmroot/python-graph-tool
Cloning into '/var/lib/mock/f40-build-731381-103859/root/chroot_tmpdir/scmroot/python-graph-tool'...
$ git fetch origin 61ababa09df0e7ba86a6fc8ea6db1e853c426f72:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/python-graph-tool
 * [new ref]         61ababa09df0e7ba86a6fc8ea6db1e853c426f72 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 61ababa Update to 2.58 (close RHBZ#2232687)