Confusing conflicts with CPAN and core perl

Bug #394481 reported by Evan Carroll on 2009-07-01
This bug affects 1 person
Affects Status Importance Assigned to Milestone
libio-compress-zlib-perl (Ubuntu)
perl (Debian)
Fix Released
perl (Ubuntu)

Bug Description

Binary package hint: libio-compress-zlib-perl

Firstly, this same file is provided in two packages, perl, and libcompress-raw-zlib-perl

root@rda:/srv/DM/DM-Model# apt-file search Compress/Raw/
libcompress-raw-zlib-perl: /usr/lib/perl5/Compress/Raw/
perl: /usr/lib/perl/5.10.0/Compress/Raw/

Ironically, if you use CPANPLUS to upgrade Compress::Raw::Zlib, it will dump over the perl file, this is because of an upstream bug I filed earlier with the way CPANPLUS is packaged in debian. Unlike CPAN, CPANPLUS is not yet configured properly by Debian. An upgrade to a core module will override any existing module packaged by perl. As if this wasn't bad enough, that module that was overriden will sit lower in the @INC stream.

So CPANPLUS will override a base-perl module with no means of brining it back, and perl won't be able to find it anyway because the perl module installed by libcompress-raw-zlib-perl will override it.

libcompress-raw-zlib-perl: /usr/lib/perl5/Compress/Raw/
(version 2.011)
perl: /usr/lib/perl/5.10.0/Compress/Raw/
(version 2.020)

Evan Carroll (evancarroll) wrote :
Changed in perl (Debian):
status: Unknown → Confirmed
Changed in perl (Debian):
status: Confirmed → Fix Released
Evan Carroll (evancarroll) wrote :

There is an non-issue very similar you can get if the distro updates these files to something newer than cpan. I had an old copy of Compress::Base::Common version (2.015) in /usr/local/lib/perl/5.10.0/IO/Compress/Base/ that I aparently installed (guessing here).

## A quick test to see if your affected by the issue
$ perl -MCompress::Zlib -e1
IO::Compress::Base::Common version 2.02 required--this is only version 2.015 at t line 11.
BEGIN failed--compilation aborted at /usr/share/perl5/Compress/ line 11.
Compilation failed in require.
BEGIN failed--compilation aborted.

Deleting /usr/local/lib/perl/5.10.0/IO/Compress/Base/ fixed this like-issue. (not the same one but it can return similar errors)

Evan Carroll (evancarroll) wrote :

If that above non-error happens just
rm -rf /usr/local/lib/perl/5.10.0/IO /usr/local/lib/perl/5.10.0/Compress

You will /have/ to do this if you upgrade to karmic and you have a version less than 2.020 installed on the time you upgrade.

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