Is there any way to remotely fetch the current live version of an application?

[kj]

I would like to write a script that prevents me from deploying the app if the version is the same as the current live version. I see that appcfg has a "list_versions" command but that just returns a list of all the upload versions. I'd like to see what is the currently deployed live version.

[kj]

I couldn't find any way to do this, even using the remote API. The SystemProperty properties all come back with null values.

I ended up writing a little servlet that just returns the version:

public class VersionServlet extends HttpServlet 

{

    @Override

    public void doGet(HttpServletRequest req, HttpServletResponse res)

        throws IOException

    {

    res.getOutputStream().print(SystemProperty.applicationVersion.get());