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Date: Fri, 02 Jan 2009 20:59:10 -0500
From: Eric Hui <erichui AT speakeasy DOT net>
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To: cygwin AT cygwin DOT com
Subject: Re: Re: 1.5.25: Cygwin, LAPACK, and ssh -- output "swallowed"
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Jim Kramer wrote:
> 
> Eric Hui wrote:
>> Jim Kramer wrote:
>>
>>> Concise problem description:
>>> A C/C++ program that incorporates LAPACK functions "swallows" program 
>>> output when run (as a command) over an ssh connection.
>> This may be an issue with your path.  In your example 1, try
>>
>> ssh hollyberry echo '$PATH'
>>
>> The LAPACK dll is in /usr/lib/lapack/, so that will need to be in 
>> your path.
>>
>>
> 
> Yes, thank you, that resolved it. To be sure I understand why it wasn't
> working as I expected:
> 
> When sending a command via ssh, no shell is started and therefore the cygwin
> environment (in this case, the library path) is not fully configured. So,
> the appropriate path needs to be added someplace such that *Windows* (not
> Cygwin) can find it (e.g., the Windows PATH environment variable). Do I have
> that right?

Not completely.  I believe that the issue is whether or not it is 
a login shell.  On my system, when a login shell (bash) is 
started, it sources /etc/profile, which in turn sources 
/etc/profile.d/lapack.sh, which adds the appropriate directory to 
the path.

If bash is not run as a login shell (as in your example 1), it 
does not source /etc/profile.

> Also, a follow-up question: is there another method for setting paths that
> would work under these circumstances? For instance, symbolic links to the
> LAPACK library?

Not sure what the recommended method would be.  You could just 
have your .bashrc add the path to the PATH.  It would mean that 
login shells have the path added twice, but it doesn't appear to 
really harm anything.

Perhaps a preferable method might be to wrap your executable with 
a script that sets up the path prior to invoking the executable. 
Then, just invoke the script from ssh.

-- 
-------------------------------------------
Eric C. Hui
-------------------------------------------


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