$ git clone -n https://src.fedoraproject.org/rpms/mapnik.git /var/lib/mock/f38-build-718630-96745/root/chroot_tmpdir/scmroot/mapnik
Cloning into '/var/lib/mock/f38-build-718630-96745/root/chroot_tmpdir/scmroot/mapnik'...
$ git fetch origin df38c5306b3af03c529539660fb4db17b3948c01:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/mapnik
 * [new ref]         df38c5306b3af03c529539660fb4db17b3948c01 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at df38c53 Add missing cstdint include