Re: When you change Perl versions, how do you resync all the CPAN modules you have installed [tag://sysadmin,cpan,modules,upgrade]

[snoopy]

At all times, I maintain a Module::Build's OO interface to produce a report of required modules. This can be used in any situation where I need to rebuild/upgrade/recover in a hurry.

For example:

#!/usr/bin/perl
use common::sense;
use Module::Build;
use Sys::Hostname qw/hostname/;

my $build = Module::Build->new
(
 module_name => 'DLS',
 license  => 'perl',
 requires => {
     'perl'            => '5.8.0',

     'CGI'           => '3.11',
     'ACME::EyeDrops'  => '1.23',
 },

 dist_version => 0.1,
);

print "CPAN Dependencies for ".hostname()."\n";
print "=============================================\n";
print $build->prereq_report;

Then on my target machine:

snoopy@snoopy-laptop:~$ perl cpan_deps.pl 2>/dev/null
Checking prerequisites...
CPAN Dependencies for snoopy-laptop
=====================================

requires:
    Module              Need     Have
    -----------------+---------+----------
  ! ACME::EyeDrops      1.23      <none>
    CGI                 3.11      3.42
    perl                5.8.0     5.10.0