title: svn-git : git cat-file "not a valid object name" bad named file unfindable
body: <p>As you may have understood i am trying to put a SVN repo on Git, and i need to keep the history.
  I use this command to do it :</p>
  <blockquote>
  <p>git svn clone $1  --no-metadata -A authors_git.txt --stdlayout ~/temp</p>
  </blockquote>
  <p>But sadly an error occurred, there is a tag with a space in his name and git cat-file doesn't really like it, i know that i have to replace it with &quot;%20&quot; but the file is not at the path given by git cat-file.</p>
  <blockquote>
  <p>fatal: Not a valid object name refs/remotes/tags/5.0.2 Mercanet</p>
  <p>cat-file commit refs/remotes/tags/5.0.2 Mercanet: command returned error: 128</p>
  </blockquote>
  <p>So i did some researches (i am a trainee and i am doing it for the enterprise i am working for) and i discovered that this tag has been removed, but it is still in the history of the SVN repo (and the history is huge...) .</p>
  <p>So here are some questions i have :</p>
  <ol>
  <li>How can i have access to this file ?</li>
  <li>How can i change its name ? (does a simple rename or cp works?)</li>
  <li>Do i have to change the name for each SVN revision ?</li>
  </ol>
  <p>Sorry for the bad english and thanks for reading (and maybe answering) ! Have a nice day !</p>