source bash config from perl code

[Shlomi Fish]

On Wednesday 30 Sep 2009 17:52:34 Oleg Goldshmidt wrote:
> On Wed, Sep 30, 2009 at 4:48 PM, Alexander Indenbaum
> 
> <alexander.indenbaum at gmail.com> wrote:
> > Hello,
> >
> > I have bash script which alters environment, kind of configuration,
> > let's say config.env.
> >
> > I'd like to import this environment in context of perl script.  How do
> > I do equivalent to 'source config.env' from perl code? I mean I could
> > just run bash in subprocess, but it would not alter perl process
> > environment.
> >
> > Any thoughts?
> 
> My first thought is to create a wrapper bash script that will source
> config.env and call the perl script (or an arbitrary command specified
> as the tail of the command line, if you wish) in case of success. I am
> not an expert in perl but I suspect you can then call the wrapper
> script using system()/exec()/friends from other perl code.
> 
> "There is no problem in computer science that cannot be solved with
> another layer of indirection." Who said that? ;-)
> 

According to http://en.wikipedia.org/wiki/Abstraction_layer :

A famous aphorism of David Wheeler goes: All problems in computer science can 
be solved by another level of indirection;[2] this is often deliberately mis-
quoted with "abstraction" substituted for "indirection". Kevlin Henney's 
corollary to this is, "...except for the problem of too many layers of 
indirection."

This is http://en.wikipedia.org/wiki/David_Wheeler_%28computer_scientist%29 
who passed away at 13 December 2004 . He should not be confused with these two 
other programmers called "David Wheeler" who are still alive and well 
("ve'sheyibadlu lehayim arukim"):

* http://www.dwheeler.com/

* http://search.cpan.org/~dwheeler/ ; http://www.justatheory.com/

Regards,

	Shlomi Fish

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Shlomi Fish       http://www.shlomifish.org/
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