[paramiko] (no subject)

[Kevin Horn]

If I'm reading the API docs correctly, channel.exec_command does not 
appear to have a return value, so (IIRC) it will always evaluate to 
"None" in a boolean expression.

Thus your test will always evaluate to true, whether the command runs or 
not.

Someone a little more familiar with paramiko want to either back me up 
or correct me on this?

Kevin Horn

Dony Pierre wrote:
> Hi all,
> 
> I'm new python and in paramiko, so can you please help me with this
> problem =
> 
> Here is my code  (with cmd = "ls")
> <<<<
> paramiko.util.log_to_file('ssh-cmd.log')
> client = paramiko.Transport((hostname,hostport))
> client.connect(username=username,password=password)
> channel=client.open_session()
> 
> if not channel.exec_command(cmd):
>         raise 'Error:Failed to run command', cmd
> 
> stdout = channel.makefile('rb')
> 
> for line in stdout:
>         print line.strip('\n')
> <<<<<
> gives the following error : 
> 
> Traceback (most recent call last):
>   File "check_brocade1.py", line 32, in ?
>     raise 'Error:Failed to run command', cmd
> Error:Failed to run command: ls
> 
> Output ssh-cmd.log is : 
> 
> DEB [20070123-08:26:28.698] thr=1   paramiko.transport: starting thread
> (client mode): 0xB7C582ECL
> INF [20070123-08:26:28.706] thr=1   paramiko.transport: Connected
> (version 2.0, client OpenSSH_3.9p1)
> DEB [20070123-08:26:28.712] thr=1   paramiko.transport: kex
> algos:['diffie-hellman-group-exchange-sha1',
> 'diffie-hellman-group14-sha1', 'diffie-hellman-group1-sha1'] server
> key:['ssh-rsa', 'ssh-dss'] client encrypt:['aes128-cbc', '3des-cbc',
> 'blowfish-cbc', 'cast128-cbc', 'arcfour', 'aes192-cbc', 'aes256-cbc',
> 'rijndael-cbc at lysator.liu.se', 'aes128-ctr', 'aes192-ctr', 'aes256-ctr']
> server encrypt:['aes128-cbc', '3des-cbc', 'blowfish-cbc', 'cast128-cbc',
> 'arcfour', 'aes192-cbc', 'aes256-cbc', 'rijndael-cbc at lysator.liu.se',
> 'aes128-ctr', 'aes192-ctr', 'aes256-ctr'] client mac:['hmac-md5',
> 'hmac-sha1', 'hmac-ripemd160', 'hmac-ripemd160 at openssh.com',
> 'hmac-sha1-96', 'hmac-md5-96'] server mac:['hmac-md5', 'hmac-sha1',
> 'hmac-ripemd160', 'hmac-ripemd160 at openssh.com', 'hmac-sha1-96',
> 'hmac-md5-96'] client compress:['none', 'zlib'] server compress:['none',
> 'zlib'] client lang:[''] server lang:[''] kex follows?False
> DEB [20070123-08:26:28.712] thr=1   paramiko.transport: Ciphers agreed:
> local=aes128-cbc, remote=aes128-cbc
> DEB [20070123-08:26:28.713] thr=1   paramiko.transport: using kex
> diffie-hellman-group1-sha1; server key type ssh-rsa; cipher: local
> aes128-cbc, remote aes128-cbc; mac: local hmac-sha1, remote hmac-sha1;
> compression: local none, remote none
> DEB [20070123-08:26:28.930] thr=1   paramiko.transport: Switch to new
> keys ...
> DEB [20070123-08:26:28.932] thr=2   paramiko.transport: Attempting
> password auth...
> DEB [20070123-08:26:28.956] thr=1   paramiko.transport: userauth is OK
> INF [20070123-08:26:28.965] thr=1   paramiko.transport: Authentication
> (password) successful!
> DEB [20070123-08:26:28.998] thr=2   paramiko.transport.1: Max packet in:
> 34816 bytes
> DEB [20070123-08:26:29.004] thr=1   paramiko.transport.1: Max packet
> out: 32768 bytes
> INF [20070123-08:26:29.004] thr=1   paramiko.transport: Secsh channel 1
> opened.
> DEB [20070123-08:26:29.016] thr=1   paramiko.transport.1: Sesch channel
> 1 request ok
> 
> 
> Thanks for your help.
> Regards.
> Pierre.
> 
> 
> 
> 
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