title: git annex / ssh : ControlPath too long
body: <p>when running the command : git annex sync, I get the following error:</p>
  
  <pre><code>ControlPath too long
  Command ssh ["-S","&lt;local path to git repo&gt;/.git/annex/ssh/git@&lt;git url&gt;","-o","ControlMaster=auto","-o","ControlPersist=yes","git@&lt;git url&gt;","git-annex-shell 'configlist' '&lt;local path to git repo&gt;'"] failed; exit code 255
  </code></pre>
  
  <p>according to <a href="https://forums.openshift.com/solved-git-clone-or-other-git-command-exits-with-error-controlpath-too-long">this</a> , the issue is not git but ssh (but the solution proposed there did not work).</p>
  
  <p>Anything I could to to avoid this issue ?</p>