$ git clone -n https://src.fedoraproject.org/rpms/plasma-discover.git /var/lib/mock/f42-build-side-1-3510380-46030/root/chroot_tmpdir/scmroot/plasma-discover
Cloning into '/var/lib/mock/f42-build-side-1-3510380-46030/root/chroot_tmpdir/scmroot/plasma-discover'...
$ git fetch origin 71bf56c2642de304ec5397c338223c85b9535a6f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/plasma-discover
 * [new ref]         71bf56c2642de304ec5397c338223c85b9535a6f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 71bf56c 6.3.4