$ git clone -n https://src.fedoraproject.org/rpms/python-ujson.git /var/lib/mock/f41-build-856142-167459/root/chroot_tmpdir/scmroot/python-ujson
Cloning into '/var/lib/mock/f41-build-856142-167459/root/chroot_tmpdir/scmroot/python-ujson'...
$ git fetch origin 4e652833994f15cc5b51f144ace5922ba026d61e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/python-ujson
 * [new ref]         4e652833994f15cc5b51f144ace5922ba026d61e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4e65283 Update to 5.10.0