$ git clone -n https://src.fedoraproject.org/rpms/plasma-nano.git /var/lib/mock/f42-bootstrap-3533965-46428/root/chroot_tmpdir/scmroot/plasma-nano
Cloning into '/var/lib/mock/f42-bootstrap-3533965-46428/root/chroot_tmpdir/scmroot/plasma-nano'...
$ git fetch origin 4cc86af9f3de48c11162536b93cd42f0272c32f2:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/plasma-nano
 * [new ref]         4cc86af9f3de48c11162536b93cd42f0272c32f2 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4cc86af 6.3.5