title: r shiny - get user computer volumes for dirGetter and shinyDirChoose when app on server
body: <p>While writing the app on my own computer, <code>getVolumes()</code> does what I want it to do: starting <code>shinyDirChoose</code> off at the root of my computer. This allows to browse to any folder on my computer.</p>
  
  <p>After upload to shinyapps.io, however, I get the server's volumes.</p>
  
  <p>How can I still get the local, user volumes instead of the server's, even when running the app from the server? If not possible, maybe the C: drive?</p>
  
  <pre><code>volumes &lt;- getVolumes()
  shinyDirChoose(input, 'directory', roots=volumes, session=session)
  </code></pre>