On Wed, Sep 19, 2012 at 6:13 PM, eryksun <[email protected]> wrote:
>
> cmd = 'python remote.py "%s" "%s" "%s"' % (arg1, arg2, arg3)
>
> try:
> out = subprocess.check_output(['ssh', '%s@%s' % (user, hostname),
> cmd])
I forgot you need to escape special characters in the arguments. You
can add quoting and escape special characters at the same time with
the undocumented function pipes.quote:
import pipes
args = tuple(pipes.quote(arg) for arg in (arg1, arg2, arg3))
cmd = 'python test.py %s %s %s' % args
Notice there are no longer quotes around each %s in cmd. Python 3.3
will have shlex.quote:
http://docs.python.org/dev/library/shlex.html#shlex.quote
Also, if you don't care about the output, use subprocess.check_call()
instead. However, the connection still waits for the remote shell's
stdout to close. If remote.py is long-running, redirect its stdout to
a log file or /dev/null and start the process in the background (&).
For example:
cmd = 'python remote.py %s %s %s >/dev/null &' % args
With this command remote.py is put in the background, stdout closes,
the forked sshd daemon on the server exits, and ssh on the client
immediately returns.
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