id	summary	reporter	owner	description	type	status	priority	milestone	component	version	resolution	keywords	cc	launchpad_bug
1811	9P frontend	davidsarah		"[http://9p.cat-v.org/ 9P] is a POSIXish remote filesystem protocol somewhat like SFTP ([http://man.cat-v.org/plan_9/5/intro protocol spec]). This ticket is to write a 9P frontend that would probably be implemented alongside other frontend protocols — web-API, SFTP and FTP — as part of a gateway node.

Just as we do for SFTP, we'd have to deal with the impedence mismatch between Tahoe's access control model and 9P's, by faking permissions sufficient to satisfy 9P clients. It is probably not necessary to distinguish owner, group and world permissions.

There is a [http://mirtchovski.com/p9/py9p/index.php py9p library] we could use to implement the 9P server. It uses blocking socket calls but they're nicely factored into a single short class ([https://bitbucket.org/f2f/py9p/src/5c2eb7c7f28b/py9p/py9p.py#cl-170 py9p.Sock]), so could easily be changed. It also depends on !PyCrypto; again this dependency is fairly nicely factored (into [https://bitbucket.org/f2f/py9p/src/5c2eb7c7f28b/py9p/pki.py py9p.pki] and [https://bitbucket.org/f2f/py9p/src/5c2eb7c7f28b/py9p/sk1.py#cl-61 one method of py9p.sk1]) so could be changed to use pycryptopp, say.

The [https://bitbucket.org/f2f/py9p/src/5c2eb7c7f28b/examples/localsrv.py local filesystem server example code] seems as though it would be reasonably easy to adapt to call into the [https://tahoe-lafs.org/trac/tahoe-lafs/browser/git/src/allmydata/frontends/sftpd.py#L947 SFTP frontend's internal POSIXish interface] (i.e. with the 9P server code taking the place of Twisted's SFTP server) instead of making OS calls."	enhancement	new	major	undecided	code-frontend	1.9.2		9p sftp pycrypto