$ git clone -n https://src.fedoraproject.org/rpms/python-jsonstreams.git /var/lib/mock/f39-build-1942415-43164/root/chroot_tmpdir/scmroot/python-jsonstreams
Cloning into '/var/lib/mock/f39-build-1942415-43164/root/chroot_tmpdir/scmroot/python-jsonstreams'...
$ git fetch origin 3bb4f217db0dcae306f298c132c17fc7c45d7295:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/python-jsonstreams
 * [new ref]         3bb4f217db0dcae306f298c132c17fc7c45d7295 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3bb4f21 Initial import