On Tue, Oct 20, 2009 at 11:11 AM, Nathan Farrar <nathan.far...@gmail.com>wrote:
> I haven't been able to find any real examples of pexpect usage, nor
> documentation. Just little bits here and there, so I'm kind of
> struggling through.
>
> I've got the follow bit of code I'm working with:
>
> def main():
> try:
> print 'attempting to spawn connection ... '
> session = pexpect.spawn('ssh usern...@x.x.x.x')
> except:
> print 'couldn\'t spawn connection ... '
>
> print 'waiting for password prompt ... '
> session.expect('password:')
> print 'received password prompt ... '
>
> try:
> print 'attempting to send password ... '
> session.sendline(password)
> except:
> print 'error sending password ... '
>
> print 'waiting for command prompt ... '
> session.expect(command_prompt)
> print 'received command prompt ... '
>
> try:
> print 'attempting to issue \'show version\' command ... '
> session.sendline([expect.TIMEOUT=1, 'show version'])
> except:
> print 'error issuing \'show version\' command ... '
>
> print 'waiting for command prompt ... '
> session.expect(command_prompt)
> print 'received command prompt ... '
>
> print 'attempting to print command results ... '
> print session.before
>
> print 'closing session ... '
> session.close()
>
> if __name__=='__main__':
> main()
>
> When I run this against a cisco device, it times out waiting for the
> command prompt after issuing the show version command. However, if I
> change 'show version' to something like 'blah blah' it doesn't time
> out, and I get the results of the command (an error message that is
> much shorter in length).
>
> I believe that the results of the show version command are simply too
> large. I think I may need to increase the size of maxread &
> searchwindowsize & set the timeout to something lower than the
> default, but I haven't been able to figure out how to do this
> correctly yet.
>
> Any help would be greatly appreciated. I'm pulling my hair out. Thank
> you.
>
> --
> "The presence of those seeking the truth is infinitely to be preferred
> to the presence of those who think they've found it."
>
> –Terry Pratchett
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Looks like you are trying to end multiple commands to the sendline and not
expect
you can specify the timeout on the expect line
try this code:
#================================================
def main():
try:
print 'attempting to spawn connection ... '
session = pexpect.spawn('ssh usern...@x.x.x.x')
except:
print 'couldn\'t spawn connection ... '
print 'waiting for password prompt ... '
session.expect('password:')
print 'received password prompt ... '
try:
print 'attempting to send password ... '
session.sendline(password)
except:
print 'error sending password ... '
print 'waiting for command prompt ... '
session.expect(command_prompt)
print 'received command prompt ... '
try:
print 'attempting to issue \'show version\' command ... '
session.sendline('show version') #: send only command
except:
print 'error issuing \'show version\' command ... '
print 'waiting for command prompt ... '
session.expect(command_prompt, timeout=1) #: set the timeout here
print 'received command prompt ... '
print 'attempting to print command results ... '
print session.before
print 'closing session ... '
session.close()
if __name__=='__main__':
main()
#==============================
Vince
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