From: ara.t.howard@...
Date: 2007-01-03T03:25:22+09:00
Subject: Re: "su user -c 'command'" from within ruby

On Wed, 3 Jan 2007, Moritz Reiter wrote:

> Wim, thanks for your reply and sorry that it took me so long to reply again.
>
> Wim Vander Schelden wrote:
>> Are you sure your command returns? Maybe it blocks until the process
>> ends? Is there any information you could give on the command you are
>> trying to execute?
>
> This is what I want to do:
>
> port = 24800
> synergy_client = "synergyc"
> pattern = "^ssh.*#{port}"
>
> 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
#

>
> # 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.

regards.

-a
-- 
if you find yourself slandering anybody, first imagine that your mouth is
filled with excrement.  it will break you of the habit quickly enough. - the
dalai lama