$ git clone -n https://src.fedoraproject.org/rpms/python-maxminddb.git /var/lib/mock/f40-build-2213900-52353/root/chroot_tmpdir/scmroot/python-maxminddb
Cloning into '/var/lib/mock/f40-build-2213900-52353/root/chroot_tmpdir/scmroot/python-maxminddb'...
$ git fetch origin b312a84e3b42f638c00d22c8bbbaacd7c6b317fb:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/python-maxminddb
 * [new ref]         b312a84e3b42f638c00d22c8bbbaacd7c6b317fb -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b312a84 Update to 2.5.1 (rhbz#2248764)