a patch for #308472: show the server version

[Andrew Bennetts]

Stephen Emslie wrote:
>    Here is a patch for bug #308472 that came out of the Bazaar sprint at
>    EuroPython this afternoon.
> 
>    The patch adds the server version number to the output of "bzr info" when
>    connected to a smart server. It could probably use some polish, but gives
>    the general idea.

[...]
> +    from bzrlib.smart.client import _SmartClient
> +    if isinstance(repository._client, _SmartClient):
> +        server_version = repository._client._headers['Software version']
> +        server_info = " (smart server %s)" % server_version

I'm pretty sure this will print the *client's* version, not the server's.
To find out the server's version you need to look at a response the server
sends.

The API for looking at response headers isn't particularly elegant yet, but
there's a simple example in:

    http://bazaar.launchpad.net/~spiv/bzr-ping/trunk/annotate/head%3A/__init__.py

bb:resubmit

-Andrew.