title: Git push error '[remote rejected] master -> master (branch is currently checked out)'
body: <p>Yesterday, I posted a question on how to clone a <a href="http://en.wikipedia.org/wiki/Git_%28software%29" rel="noreferrer">Git</a> repository from one of my machines to another, <em><a href="https://stackoverflow.com/questions/2808177/how-can-i-git-clone-from-another-machine/2809612#2809612">How can I 'git clone' from another machine?</a></em>.</p>
  
  <p>I am now able to successfully clone a Git repository from my source (192.168.1.2) to my destination (192.168.1.1).</p>
  
  <p>But when I did an edit to a file, a <code>git commit -a -m "test"</code> and a <code>git push</code>, I get this error on my destination (192.168.1.1):</p>
  
  <pre><code>git push                                                
  hap@192.168.1.2's password: 
  Counting objects: 21, done.
  Compressing objects: 100% (11/11), done.
  Writing objects: 100% (11/11), 1010 bytes, done.
  Total 11 (delta 9), reused 0 (delta 0)
  error: refusing to update checked out branch: refs/heads/master
  error: By default, updating the current branch in a non-bare repository
  error: is denied, because it will make the index and work tree inconsistent
  error: with what you pushed, and will require 'git reset --hard' to match
  error: the work tree to HEAD.
  error: 
  error: You can set 'receive.denyCurrentBranch' configuration variable to
  error: 'ignore' or 'warn' in the remote repository to allow pushing into
  error: its current branch; however, this is not recommended unless you
  error: arranged to update its work tree to match what you pushed in some
  error: other way.
  error: 
  error: To squelch this message and still keep the default behaviour, set
  error: 'receive.denyCurrentBranch' configuration variable to 'refuse'.
  To git+ssh://hap@192.168.1.2/media/LINUXDATA/working
  ! [remote rejected] master -&gt; master (branch is currently checked out)
  error: failed to push some refs to 'git+ssh://hap@192.168.1.2/media/LINUXDATA/working'
  </code></pre>
  
  <p>I'm using two different versions of Git (1.7 on the remote and 1.5 on the local machine). Is that a possible reason?</p>