Interface with remote programs allowing for as many hops as needed

[pdehaye]

see
http://groups.google.com/group/sage-support/browse_thread/thread/b7215f69359ff4c2

Component: interfaces

Issue created by migration from https://trac.sagemath.org/ticket/439

[pdehaye]

comment:4

Attachment: 5771.patch.gz

Just posted a patch. Issues that still need to be resolved:

• could do better when converting with sage() remote objects
• the _remote_tmpfile is defaulted to "/tmp", I am not sure that's a good idea, and if we shouldn't just return an error if (server_tmpdir is None) and not (server is None)

[pdehaye]

comment:5

also, removed expect.tmp as this was confusing:
there ought to be two different temporary files in expect.py. one would be _local_tmpfile and interact with sage/python and the other one _remote_tmpfile and interact with the remote CAS session.
allowing for something named tmp in expect.py is confusing as people who program more interfaces don t tend to think of the distinction needed when doing things remotely, and end up using the same file for both (without scp'ing one to the other if is_remote())

[pdehaye]

comment:6

Trac #160, which will be included before this, might need to be revisited.

[williamstein]

comment:8

Paul has implemented this, sent me a patch, and I've applied it.