Re: [Fab-user] How set shell to none

[Chris Vest]

So you say this works:

echo "<cmd>" | ssh address@hidden:port

Does this work?

ssh address@hidden:port "<cmd>"

Fabric (assuming my info is current) uses the command sub-protocol of ssh, not the shell sub-protocol, which I'm guessing is what happens when you pipe to ssh.

Chris

On 10/04/2013, at 16.51, Zhigang Wang <address@hidden> wrote:

Thanks very much. However, it doesn't work.

I think this issue may live in the paramiko side: don't know anyone familiar with the difference between:

1. ssh address@hidden:port <cmd>

2. echo "<cmd>" | ssh address@hidden:port

The second one works. So maybe we can emulate that behavior in paramiko/fabric.

Thanks,

Zhigang

On Tue, Apr 9, 2013 at 9:52 PM, Jeff Forcier <address@hidden> wrote:

Pro tip:

* Read up on what ssh -T does (it disables allocation of a remote pty)
* Search Fabric docs for "pty"
* Find out you can set env.always_use_pty=False to disable use of a remote pty
* Hopefully discover that this fixes the problem (?)

On Tue, Apr 9, 2013 at 7:16 PM, Zhigang Wang <address@hidden> wrote:
> Thanks.
>
> Currently I hit this:
> http://net-ssh.lighthouseapp.com/projects/36253/tickets/32-sun-ilom-wont-accept-commands-even-after-successful-login
>
> Maybe a ILOM bug, but they have workaround:
>
> Doesnt' work:
>
> $ ssh -t address@hidden "show /SYS"
>
> Warning: Permanently added 'ca-dev33m,10.211.2.238' (RSA) to the list of
> known hosts.
> Password:
> shell: Invalid credentials
>
>
> Connection to ca-dev33m closed.
>
> Works:
>
> $ echo "show /SYS" | ssh -T address@hidden
>
> How to clone the same behavior in fabric?
>
> Using our fabric:
>
> # python ilom.py -s address@hidden -p changeme
> /usr/lib64/python2.6/site-packages/Crypto/Util/number.py:57:
> PowmInsecureWarning: Not using mpz_powm_sec.  You should rebuild using
> libgmp >= 5 to avoid timing attack vulnerability.
>   _warn("Not using mpz_powm_sec.  You should rebuild using libgmp >= 5 to
> avoid timing attack vulnerability.", PowmInsecureWarning)
> address@hidden Executing task 'ilom_get_mac'
> address@hidden run: show /System ilom_mac_address
> INFO:paramiko.transport:Connected (version 2.0, client OpenSSH_5.1)
> INFO:paramiko.transport:Authentication (keyboard-interactive) successful!
> INFO:paramiko.transport:Secsh channel 1 opened.
> address@hidden out: shell: Invalid credentials
> address@hidden out:
> address@hidden out:
> address@hidden out:
>
> Disconnecting from ca-dev33m... done.
> shell: Invalid credentials
>
>
> From here:
> https://groups.google.com/group/mailing.unix.openssh-dev/tree/browse_frm/month/2009-07?_done=%2Fgroup%2Fmailing.unix.openssh-dev%2Fbrowse_frm%2Fmonth%2F2009-07%3F&
>
> It may related to the buffersize? How can I enlarge the buffersize for
> fabric?
>
> I tried env.linewise=True, it doesn't help.
>
> I will continue debugging on it.
>
> Thanks,
>
> Zhigang
>
>
> On Tue, Apr 9, 2013 at 6:55 PM, Jeff Forcier <address@hidden> wrote:
>>
>> Try setting env.use_shell = False:
>>
>>     http://docs.fabfile.org/en/1.6/usage/env.html#use-shell
>>
>> On Tue, Apr 9, 2013 at 6:40 PM, Zhigang Wang <address@hidden> wrote:
>> > Hi Jeff and all,
>> >
>> > I want to use fabric for ilom, a ssh configuration interface. Currently
>> > it
>> > doesn't work because the ilom system doesn't have a shell there. How can
>> > set
>> > env.shell to none? Or is it supported?
>> >
>> > The ilom shell:
>> >
>> > $ ssh address@hidden
>> > Warning: Permanently added 'ca-dev33m,10.211.2.238' (RSA) to the list of
>> > known hosts.
>> > Password:
>> >
>> > Oracle(R) Integrated Lights Out Manager
>> >
>> > Version 3.1.2.10 r74387
>> >
>> > Copyright (c) 2012, Oracle and/or its affiliates. All rights reserved.
>> >
>> > Warning: password is set to factory default.
>> >
>> > -> help
>> > The help command is used to view information about commands and targets
>> >
>> > Usage: help [-format wrap|nowrap] [-o|-output terse|verbose]
>> > [<command>|legal|targets|<target>|<target> <property>]
>> >
>> > Special characters used in the help command are
>> > []   encloses optional keywords or options
>> > <>   encloses a description of the keyword
>> >      (If <> is not present, an actual keyword is indicated)
>> > |    indicates a choice of keywords or options
>> >
>> > help <target>              displays description if this target and its
>> > properties
>> > help <target> <property>   displays description of this property of this
>> > target
>> > help targets               displays a list of targets
>> > help legal                 displays the product legal notice
>> >
>> > Commands are:
>> > cd
>> > create
>> > delete
>> > dump
>> > exit
>> > help
>> > load
>> > reset
>> > set
>> > show
>> > start
>> > stop
>> > version
>> >
>> > -> sh
>> > Invalid command 'sh' - type help for a list of commands.
>> >
>> > -> bash
>> > Invalid command 'bash' - type help for a list of commands.
>> >
>> > Thanks,
>> >
>> > Zhigang
>>
>>
>>
>> --
>> Jeff Forcier
>> Unix sysadmin; Python/Ruby engineer
>> http://bitprophet.org
>
>



--
Jeff Forcier
Unix sysadmin; Python/Ruby engineer
http://bitprophet.org

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