$ git clone -n https://src.fedoraproject.org/rpms/python-ujson.git /var/lib/mock/f40-build-2204528-51963/root/chroot_tmpdir/scmroot/python-ujson
Cloning into '/var/lib/mock/f40-build-2204528-51963/root/chroot_tmpdir/scmroot/python-ujson'...
$ git fetch origin d8faab0823dffa31d2a8a0f44914dbe4eb3a5419:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/python-ujson
 * [new ref]         d8faab0823dffa31d2a8a0f44914dbe4eb3a5419 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d8faab0 Update to 5.9.0 (close RHBZ#2253921)