pxssh submit su commands = very very slow

[gert]

This works but after the su command you have to wait like 2 minutes
before each command gets executed ?
What did i do wrong ?

import pxssh

try:
s = pxssh.pxssh()
s.login ('127.0.0.1', 'gert', '123')
s.sendline ('uptime')
s.prompt()
print s.before
s.sendline ('ls -l')
s.prompt()
print s.before
s.sendline ('df')
s.prompt()
print s.before
s.sendline ('su')
s.expect('Passw ord:')
s.sendline ('123')
s.prompt()
print s.before
s.sendline ('df')
s.prompt()
print s.before
s.sendline ('exit')
s.logout()

except pxssh.Exception Pxssh, e:
print "pxssh failed on login."
print str(e)

[Neil Hodgson]

Re: pxssh submit su commands = very very slow

gert:

This works but after the su command you have to wait like 2 minutes
before each command gets executed ?
s.sendline ('su')
s.expect('Passw ord:')

A common idiom seems to be to omit the start of the expected reply
since it may not be grabbed quickly enough. Then the prompt has to time
out. Try
s.expect('asswo rd:')

Neil

[gert]

Re: pxssh submit su commands = very very slow

On Jun 29, 1:19 am, Neil Hodgson <nyamatongwe+th un...@gmail.com >
wrote:

gert:
>

This works but after the su command you have to wait like 2 minutes
before each command gets executed ?
            s.sendline ('su')
            s.expect('Passw ord:')

>
    A common idiom seems to be to omit the start of the expected reply
since it may not be grabbed quickly enough. Then the prompt has to time
out. Try
              s.expect('asswo rd:')
>

I tested, but it has the same result. Each command after the su
command needs 2 minutes before pxssh display's its output.
Could there be a expat loop in pxssh or something ?

[gert]

Re: pxssh submit su commands = very very slow

On Jun 29, 1:44 am, gert <gert.cuyk...@g mail.comwrote:

On Jun 29, 1:19 am, Neil Hodgson <nyamatongwe+th un...@gmail.com >
wrote:
>

gert:

>

This works but after the su command you have to wait like 2 minutes
before each command gets executed ?
            s.sendline ('su')
            s.expect('Passw ord:')

>

    A common idiom seems to be to omit the start of the expected reply
since it may not be grabbed quickly enough. Then the prompt has to time
out. Try
              s.expect('asswo rd:')

>
I tested, but it has the same result. Each command after the su
command needs 2 minutes before pxssh display's its output.
Could there be a expat loop in pxssh or something ?

I am pretty sure it has to do with the prompt changing from $ to #

[Grant Edwards]

Re: pxssh submit su commands = very very slow

On 2008-06-28, Neil Hodgson <nyamatongwe+th under@gmail.com wrote:

gert:

>This works but after the su command you have to wait like 2 minutes
>before each command gets executed ?
> s.sendline ('su')
> s.expect('Passw ord:')

>
A common idiom seems to be to omit the start of the
expected reply since it may not be grabbed quickly enough.
Then the prompt has to time out. Try s.expect('asswo rd:')

I don't see why the first letter of the password prompt would
be dropped. Tty drivers have buffered data for as long as I've
been using Unix (25+ years). After writing the username you
can wait for an hour before calling read(), and you'll still
see the entire password prompt. I always assumed it was done
that way so the script would work for either "password:" or
"Password:" .

--
Grant Edwards grante Yow! Edwin Meese made me
at wear CORDOVANS!!
visi.com

[gert]

Re: pxssh submit su commands = very very slow

this does the same except 100 times faster ?

I don't understand the logic about the prompt, its not the same as the
output from the bash shell ?

root@r12276:~# cat ssh2.py
import pexpect
import sys

child = pexpect.spawn(" ssh gert@127.0.0.1" )
#child.logfile = sys.stdout

i = child.expect(['assword:', r'yes/no'],timeout=120)
if i==0:
child.sendline( '123')
elif i==1:
child.sendline( 'yes')
child.expect('a ssword:', timeout=120)
child.sendline( '123')
child.expect('g ert@rxxxx.ovh.n et: ~')
print child.before

child.sendline( 'ls -l')
child.expect('g ert@rxxxx.ovh.n et:')
print child.before

child.sendline( 'su')
child.expect('a ssword:')
child.sendline( '123')
child.expect('g ert@rxxxx.ovh.n et: /srv/www/gert')
print child.before

child.sendline( 'ls -l')
child.expect('r oot@rxxxx.ovh.n et:')
print child.before

[Dan Stromberg]

Re: pxssh submit su commands = very very slow

On Sat, 28 Jun 2008 19:08:59 -0700, gert wrote:

this does the same except 100 times faster ?
>
I don't understand the logic about the prompt, its not the same as the
output from the bash shell ?
>
root@r12276:~# cat ssh2.py
import pexpect
import sys
>
child = pexpect.spawn(" ssh gert@127.0.0.1" ) #child.logfile = sys.stdout
>
i = child.expect(['assword:', r'yes/no'],timeout=120) if i==0:
child.sendline( '123')
elif i==1:
child.sendline( 'yes')
child.expect('a ssword:', timeout=120) child.sendline( '123')
child.expect('g ert@rxxxx.ovh.n et: ~') print child.before
>
child.sendline( 'ls -l')
child.expect('g ert@rxxxx.ovh.n et:')
print child.before
>
child.sendline( 'su')
child.expect('a ssword:')
child.sendline( '123')
child.expect('g ert@rxxxx.ovh.n et: /srv/www/gert') print child.before
>
child.sendline( 'ls -l')
child.expect('r oot@rxxxx.ovh.n et:')
print child.before

You could try changing the prompt (pxssh appears to have a way of doing
that), but I prefer to set up passwordless, passphraseless ssh and do
each command separately. For the rootly portions, you might look into
passwordless sudo if you go that route.

Here's something about setting up passwordless, passphraseless ssh:

http://stromberg.dnsalias.org/~strombrg/ssh-keys.html

[gert]

Re: pxssh submit su commands = very very slow

On Jun 29, 4:45 am, Dan Stromberg <dstrombergli.. .@gmail.comwrot e:

On Sat, 28 Jun 2008 19:08:59 -0700, gert wrote:

this does the same except 100 times faster ?

>

I don't understand the logic about the prompt, its not the same as the
output from the bash shell ?

>

root@r12276:~# cat ssh2.py
import pexpect
import sys

>

child = pexpect.spawn(" ssh g...@127.0.0.1" ) #child.logfile = sys.stdout

>

i = child.expect(['assword:', r'yes/no'],timeout=120) if i==0:
    child.sendline( '123')
elif i==1:
    child.sendline( 'yes')
    child.expect('a ssword:', timeout=120) child.sendline( '123')
child.expect('g ...@rxxxx.ovh.n et: ~') print child.before

>

child.sendline( 'ls -l')
child.expect('g ...@rxxxx.ovh.n et:')
print child.before

>

child.sendline( 'su')
child.expect('a ssword:')
child.sendline( '123')
child.expect('g ...@rxxxx.ovh.n et: /srv/www/gert') print child.before

>

child.sendline( 'ls -l')
child.expect('r ...@rxxxx.ovh.n et:')
print child.before

>
You could try changing the prompt (pxssh appears to have a way of doing
that), but I prefer to set up passwordless, passphraseless ssh and do
each command separately.  For the rootly portions, you might look into
passwordless sudo if you go that route.
>
Here's something about setting up passwordless, passphraseless ssh:
>
http://stromberg.dnsalias.org/~strombrg/ssh-keys.html

My boss does not allow me to cp a key on the phone server. I only have
a email with some commands and passwords.