$ git clone -n https://src.fedoraproject.org/rpms/mapnik.git /var/lib/mock/f41-build-1702126-24562/root/chroot_tmpdir/scmroot/mapnik
Cloning into '/var/lib/mock/f41-build-1702126-24562/root/chroot_tmpdir/scmroot/mapnik'...
$ git fetch origin 96bf927770546842f609370961b8157356cee9a3:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/mapnik
 * [new ref]         96bf927770546842f609370961b8157356cee9a3 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 96bf927 convert GPLv2+ license to SPDX