$ git clone -n https://src.fedoraproject.org/rpms/python-graph-tool.git /var/lib/mock/f42-build-3465130-45737/root/chroot_tmpdir/scmroot/python-graph-tool
Cloning into '/var/lib/mock/f42-build-3465130-45737/root/chroot_tmpdir/scmroot/python-graph-tool'...
$ git fetch origin ad0f5fe9fc7f3ba8c6191b437b232dd256d825f0:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/python-graph-tool
 * [new ref]         ad0f5fe9fc7f3ba8c6191b437b232dd256d825f0 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ad0f5fe Update to 2.96 (close RHBZ#2356124)