title: post-commit hook failed with error code:255 in svn
body: <p>When i commit the file</p>
  
  <p>post-commit hook failed (exit code 255) with no output.</p>
  
  <p>My post commit hook for svn is</p>
  
  <pre><code>REPOS="$1"
  REV="$2"
  
  #mailer.py commit "$REPOS" "$REV" /path/to/mailer.conf
  /usr/bin/svn update --force /xxx/xxx/xxxx/xxx &gt;&gt; /xxx/xxx/xxx/xxx/logs/repos.log
  </code></pre>
  
  <p>by this error i have to update it manually only.please guide me for proper post commit for auto checkout.advance thanks </p>