ault implementation assumes that openArchive() did the parsing,
so it creates a dummy rootdir if none was set (write mode, or no '/' in the archive).
Reimplement this to provide parsing/listing on demand.
<dl class="return" compact><dt><b>Returns:</b></dt><dd> the root directory
</dd></dl>
</p></div></div><a class="anchor" name="setDevice"></a>
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<td class="memname"> setDevice</td>
<td>(</td>
<td class="paramtype">&nbsp;<em>self</em>, </