$ git clone -n https://src.fedoraproject.org/rpms/plasma-nm.git /var/lib/mock/f42-build-side-1-3566286-46733/root/chroot_tmpdir/scmroot/plasma-nm
Cloning into '/var/lib/mock/f42-build-side-1-3566286-46733/root/chroot_tmpdir/scmroot/plasma-nm'...
$ git fetch origin c3a718fef9e627b10b4298e5de420126d35f28cc:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/plasma-nm
 * [new ref]         c3a718fef9e627b10b4298e5de420126d35f28cc -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c3a718f 6.4.0