title: git clone does not work when directory not empty
body: <p>I want to do git clone repo/branch_tag .
  this command don't work because current directory not empty.
  this directory contain only one script:</p>
  
  <pre><code>git clone repo/branch_tag .
  </code></pre>
  
  <p>How can I do it ?
  can I do "<code>git reset --hard tagname</code>" after move to . ? I can't remove script because it invoke this commands.</p>