[CentOS] Pulling Hair Out - TWiki 4.2 on CentOS 5

Les Mikesell lesmikesell at gmail.com
Thu Jun 19 12:41:14 UTC 2008

Chuck wrote:
> Once I build a system and bring it to our defined baseline, I rarely use rpm
> from that point forward...I custom roll almost everything -- especially
> apache. (red hat's layout makes my skin crawl) When did CPAN become so bad?
> It was the defacto standard and source of truth for perl modules 10 years
> ago. I trust CPAN over any rpm provided by red hat. Maybe things have
> changed, it has been several years since I got down and dirty with perl
> modules...

It isn't that CPAN is bad - after all, that's where the packaged 
verisions originate too.  It is that module features and dependencies 
change over time and you need a consistent snapshot to work together. 
When you install an RPM package it keeps the version and dependencies in 
the RPM database and won't make changes that break any dependencies. 
When you install via CPAN it sort-of figures things out during the 
install but only for the perl portions and doesn't update your RPM 
database so a subsequent 'yum update' will happily overwrite your CPAN 
installed modules with something much older (just newer than the 
previous RPM).  If some other module needed the newer features, things 
are now mysteriously broken.  The fact that you can get away with this 
at all indicates how compatible how backwards-compatible they try to 
keep things in perl, but once in a while - ikely in the long lifespan of 
Centos - there are some changes that will break things.

   Les Mikesell
    lesmikesell at gmail.com

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