From: Ian Peters-campbell <mahatmamanic@...>
Date: 2008-04-16T06:24:05+09:00
Subject: Re: exec with environment?

Robert Klemme wrote:
> On 12.04.2008 16:23, Marc Heiler wrote:
>> I believe something like
>> ENV['foo'] = 'bar'
>> is enough.
> 
> This is not what the OP asked for IIRC.  He wanted to modify the
> environment of a process started from his Ruby program not the program's
> own environment.  This question was likely inspired by the POSIX C
> function /execle/.
> 
>> You can try it, compile a small GNU configure program via ruby
>> ENV['CFLAGS'] = 'O2'
>> should work, I am quite confident that it will work.
> 
> It will likely work but also affect the program's own environment as
> well as that of all subsequent started sub programs.
> 
> Kind regards
> 
>   robert

Yes, apologies if my original question was not clear.  I have a Ruby 
script which starts a new session D-Bus, and then starts two other 
applications which need to be connected to this new D-Bus.  I have 
control over the source code of one of these applications, and so can 
order it to connect to a bus whose address I pass to it at startup.  The 
second application is effectively a black box though...I can only 
control whether it connects to what it believes to be the system or 
session bus.

Thus, I need a way to clobber its DBUS_SESSION_BUS_ADDRESS at startup. 
I am already setting the ENV value on the parent process, but it is not 
passing the modified environment to the process launched via exec(). 
So...I am looking for a way to push an environment to the "black box" 
process while still managing to retain the PID in the parent (as I still 
need to be able to signal the "black box."

I hope that is more clear, and any help that people can provide would be 
appreciated :)
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