From: Moritz Reiter <mo@...>
Date: 2007-01-03T05:50:12+09:00
Subject: Re: "su user -c 'command'" from within ruby

ara.t.howard@noaa.gov wrote:
>> pid = %x{pgrep -f #{pattern}}
>> %x{kill #{pid}} if pid != 0 and pid != nil and pid != ""
> 
> #
> # use Process.kill
> #
> 
>>
>> cmd = "su #{USER} -c \"ssh -f -N -L \
>> #{port}:#{@site.synergy_server}:#{port} #{@site.synergy_server}\""
> 
> #
> # use Net::SSH
> #

That makes me look like a complete newbie, eh? Actually I am. So thanks
for the hints! :)

>>
>> # this one gets executed but nothing afterwards...
>> %x{#{cmd}}
> 
> this is probably blocking and asking for password.  perhaps you don't have
> keys or your agent running properly?  because you are using backticks/%x
> any
> stdout, such as a password prompt, will be lost.  just by changing this to
> 'system' you should be able to see if this is the case.
> 
> in any case i'm guessing this is a env/ssh issue rather than a ruby one.

It works when I use 'system' instead of %x{} but it doesn't prompt for a
password either. I have the public ssh keys exchanged. So it most
probably is an environment issue. In any case: You helped me a lot,
thank you!

Regards,
Moritz