$ git clone -n https://src.fedoraproject.org/rpms/plasma-nm.git /var/lib/mock/f42-build-side-1-3578426-46814/root/chroot_tmpdir/scmroot/plasma-nm
Cloning into '/var/lib/mock/f42-build-side-1-3578426-46814/root/chroot_tmpdir/scmroot/plasma-nm'...
$ git fetch origin d0e775d9c1361e697660c6a98312f95f93274aea:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/plasma-nm
 * [new ref]         d0e775d9c1361e697660c6a98312f95f93274aea -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d0e775d 6.4.1