$ git clone -n https://src.fedoraproject.org/rpms/python-mapnik.git /var/lib/mock/f41-build-814849-149217/root/chroot_tmpdir/scmroot/python-mapnik
Cloning into '/var/lib/mock/f41-build-814849-149217/root/chroot_tmpdir/scmroot/python-mapnik'...
$ git fetch origin f7f22be42fd398f59761a6f120804f074d7118e1:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/python-mapnik
 * [new ref]         f7f22be42fd398f59761a6f120804f074d7118e1 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f7f22be Update to new upstream snapshot