plugin: sftp transport

[Robey Pointer]

Here's a plugin for SFTP branch support using paramiko.  It works as  
of at least bzr.dev at 1310, but the Transport interface seems to be in  
flux so... "Past performance does not guarantee future results." ;)

It requires at least verison 1.4 of paramiko, though 1.5 is probably  
better:
     http://www.lag.net/paramiko/

I implemented the write support, too, but did NOT test it yet, since  
I'm not sure that part of the Transport API is really shaken out yet  
(does anything use it?).  It works at least well enough for me to do:

$ bzr branch sftp://robey@example.com/foo/bar/stuff

Read and write locks aren't supported, just like with HTTP.  There's  
probably something clever I can do there, assuming we only care about  
read/write locking against other bzr-over-sftp instances, but I  
haven't put much thought into it.

You should just be able to stick this file into your ~/.bazaar/ 
plugins/.  If there's demand, I'll make a bzr branch for holding it,  
but it's pretty small right now.

Oh yeah, this is mostly just ported from my last version, except  
using the new Transport API (which has been cleaned up a lot --  
thanks).  I think probably the 'stat' call should go away and be  
replaced by more specific calls -- there's no way you're going to get  
'stat' to work over HTTP. :)

robey
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