RE: [Slashcode-development] Running multiple Slash versions on a single box

[Howell, M. <ho...@ra...>]

To make this work, I modified my build process as such:

1. I created a directory named /usr/local/slashVERSION/perl

2. I created a build script that runs (from the slash source directory):
$ make install PREFIX=/usr/local/slashVERSION/perl
SLASH_PREFIX=/usr/local/slashVERSION

This will make the build process install perl modules into the
/usr/local/slashVERSION/perl directory.  Each subsequent site that I have
from a different source code version will have it's own value for VERSION
and thus, it's own set of Slash perl modules.

3. I modified each Apache startup script to contain the following line:
PERL5LIB="/usr/local/slashVERSION/perl/lib/perl5/site_perl/5.6.1"

Unfortunately, mod_perl will only load the first instance of a module found
in @INC, and there is no way to separate different versions of Slash from
within the same instance.  I toyed around with the 'only' module, but that
was not the solution that I was looking for.  Therefore, in order to run
multiple versions of Slash, there must be multiple instances of
Apache/mod_perl running, one for each version.



My conclusions are based on findings from the perl faq.

In perlfaq8 (see: 'man perlfaq8'), near the bottom, I found:

  How do I keep my own module/library directory?

       When you build modules, use the PREFIX option when generating
Makefiles:

           perl Makefile.PL PREFIX=/u/mydir/perl

       then either set the PERL5LIB environment variable before you run
scripts that
       use the modules/libraries (see the perlrun manpage) or say

           use lib '/u/mydir/perl';

       This is almost the same as

           BEGIN {
               unshift(@INC, '/u/mydir/perl');
           }

       except that the lib module checks for machine-dependent
subdirectories.  See
       Perl's the lib manpage for more information.

  How do I add the directory my program lives in to the module/library
search
  path?

           use FindBin;
           use lib "$FindBin::Bin";
           use your_own_modules;

  How do I add a directory to my include path at runtime?

       Here are the suggested ways of modifying your include path:

           the PERLLIB environment variable
           the PERL5LIB environment variable
           the perl -Idir command line flag
           the use lib pragma, as in
               use lib "$ENV{HOME}/myown_perllib";

       The latter is particularly useful because it knows about machine
dependent
       architectures.  The lib.pm pragmatic module was first included with
the 5.002
       release of Perl.



So far, both sites appear to be running fine.

-Mark

-----Original Message-----
From: Vl...@ge... [mailto:vl...@ge...]
Sent: Thursday, May 01, 2003 7:18 PM
To: Howell, Mark
Subject: RE: [Slashcode-development] Running multiple Slash versions on
a single box



> -----Original Message-----
> From: sla...@li...
> [mailto:sla...@li...]On Behalf Of
> Howell, Mark
> Sent: Thursday, May 01, 2003 2:29 PM
> To: sla...@li...
> Subject: [Slashcode-development] Running multiple Slash versions on a
> single box
>
>
> Hello All,
>
> I am attempting to install and run multiple versions of
> Slashcode on the
> same machine.


Good luck.  I for one do not believe this can be done.  We have just 2
versions of perl on our box, and have a large number of problems as a result
(Psst!  Jamie, are you still willing to log in and look at that for us?  :-)
and are trying to get down to JUST the version that slash is supposed to be
using.

I think the only way you could really do this would be to jail perl, apache,
mysql, etc - in short, you'd have to waste a BOAT LOAD of space for each
site.

Scott



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