$ git clone -n https://src.fedoraproject.org/rpms/jsoncpp.git /var/lib/mock/f40-build-2219226-52636/root/chroot_tmpdir/scmroot/jsoncpp
Cloning into '/var/lib/mock/f40-build-2219226-52636/root/chroot_tmpdir/scmroot/jsoncpp'...
$ git fetch origin 6aa610d4ecce42e8c24e95487b13c696e2c6ceff:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/jsoncpp
 * [new ref]         6aa610d4ecce42e8c24e95487b13c696e2c6ceff -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6aa610d Migrate to SPDX license