Re: Interactive Expect from bash Script

[Esben Stien]

Mike Frysinger <vapier@gentoo.org> writes:

> you could accomplish all of this with python alone.  are you aware of
> the pexepct module ? http://pexpect.sourceforge.net/

The implementation below is in python using pexepect and it works
fine. It still doesn't answer the question why this doesn't work in bash?

> if you're still set on this amalgamation, then might i suggest looking
> into the expect-lite package ? http://expect-lite.sourceforge.net/

expect-lite is still expect, so why do you recommend using this instead
of what I'm using now?

The following is the code in python: 

#!/usr/bin/env python
import pexpect
import struct, fcntl, os, sys, signal
import urlparse

def sigwinch_passthrough (sig, data):
    # Check for buggy platforms (see pexpect.setwinsize()).
    if 'TIOCGWINSZ' in dir(termios):
        TIOCGWINSZ = termios.TIOCGWINSZ
    else:
        TIOCGWINSZ = 1074295912 # assume
    s = struct.pack ("HHHH", 0, 0, 0, 0)
    a = struct.unpack ('HHHH', fcntl.ioctl(sys.stdout.fileno(), TIOCGWINSZ , s))
    global global_pexpect_instance
    global_pexpect_instance.setwinsize(a[0],a[1])


url = urlparse.urlparse(sys.argv[1]);

ssh_newkey = 'Are you sure you want to continue connecting'
p=pexpect.spawn('ssh'+' '+url.username+':'+url.password+'@'+url.hostname)
i=p.expect([ssh_newkey,'password:',pexpect.EOF,pexpect.TIMEOUT],1)
if i==0:
    print "I say yes"
    p.sendline('yes')
    i=p.expect([ssh_newkey,'password:',pexpect.EOF])
if i==1:
    #print "I give password",
    p.sendline(url.password)
elif i==2:
    print "I either got key or connection timeout"
    pass
elif i==3: #timeout
    pass
p.sendline("\r")
global global_pexpect_instance
global_pexpect_instance = p
signal.signal(signal.SIGWINCH, sigwinch_passthrough)

try:
    p.interact()
    sys.exit(0)
except:
    sys.exit(1)


-- 
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