$ git clone -n https://src.fedoraproject.org/rpms/plasma5support.git /var/lib/mock/f42-build-side-1-3566301-46733/root/chroot_tmpdir/scmroot/plasma5support
Cloning into '/var/lib/mock/f42-build-side-1-3566301-46733/root/chroot_tmpdir/scmroot/plasma5support'...
$ git fetch origin 980e577edb3508f2c55a8ebdc969b30a96d309cf:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/plasma5support
 * [new ref]         980e577edb3508f2c55a8ebdc969b30a96d309cf -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 980e577 6.4.0