On Thu, 25 Apr 2019 16:36:38 +0200
Petr Pisar <ppisar(a)redhat.com> wrote:
It was a long time ago I wrote to this list. I'm thinking about
changing site paths.
Now, perl configures site paths to:
so that anyone installing distributions from CPAN in a system-wide
manner will install his modules there. These two paths are listed
before core and vendor path used by Fedora packages in order to allow
users to override Perl modules coming with Fedora.
This layout has the nice feature that user's code is available across
Fedora upgrades. However, this feature is also bad because perl tends
to change ABI and as a result XS modules stop working and becuse the
site location precedence they can hinder even Fedora's Perl code.
Then inexperienced users report bugs for perl that Perl stopped
working after upgrade Fedora.
My proposal is make the two paths changing with every new
incompatible Perl release (that happens every year with a new minor
Perl version). Example:
As a result when users upgrade to Perl 5.30, their locally installed
modules become unavailable and thus they won't be able to affect the
new system. Also the user immediatelly recongnizes that his locally
installed code "disappeared" instead of receiving some cryptic error
message from XSLoader few days later when some optional XS module
Having seen a few of these bugs, I think this is a good idea.
So if we conclude that this change is good and should be
the only uncertainity is the issue of aestetic: How exactly should
the paths be named? I can see these posibilities:
The first two keep all Perl files under one directory, while the
third one proliferates directories right under /usr/local/share. It
also is backward compatible for people who back up or NFS-mount the
paths. The last two makes the path a little bit shorter. While the
first and last resembles a soname we already give to libperl.so
(/usr/lib64/libperl.so.5.30). The first two have also a very tiny
posibility of a clash with Perl modules namespaced into "5.30::" or
"30::" that could survive from current days (installed
into /usr/local/share/perl5). I like the first option.
Any opinions? Should we go with this change? Wich format do you like
I like the first one too.