SSH Connection with Python 3.0

Question

How can I make an SSH connection in Python 3.0? I want to save a file on a remote computer where I have password-less SSH set up.

Answer 1

It might take a little work because "twisted:conch" does not appear to have a 3.0 variant.

Answer 2

I recommend calling ssh as a subprocess. It's reliable and portable.

import subprocess
proc = subprocess.Popen(['ssh', 'user@host', 'cat > %s' % filename],
                        stdin=subprocess.PIPE)
proc.communicate(file_contents)
if proc.retcode != 0:
    ...

You'd have to worry about quoting the destination filename. If you want more flexibility, you could even do this:

import subprocess
import tarfile
import io
tardata = io.BytesIO()
tar = tarfile.open(mode='w:gz', fileobj=tardata)
... put stuff in tar ...
proc = subprocess.Popen(['ssh', 'user@host', 'tar xz'],
                        stdin=subprocess.PIPE)
proc.communicate(tardata)
if proc.retcode != 0:
    ...

Answer 3

You want all of the ssh-functionality implemented as a python library? Have a look at paramiko, although I think it's not ported to Python 3.0 (yet?).

If you can use an existing ssh installation you can use the subprocess way Dietrich described, or (another way) you could also use pexcept (website here).

Answer 4

Have you looked at Paramiko?