Managing Perl Libraries

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Overview

Maintaining Perl modules across our server farm can be a time consuming and tedious task because of the heterogeneity of our setup. Further, we often need to maintain unique sets of libraries for different applications with collisions.

To solve these problems, I maintain local copies of libraries for each application. Typically, these are found at

 /path/to/application/extlib

Installing a local CPAN repository

I maintain a local mirror of CPAN. This makes installing our web application significantly faster.

$ sudo perl -MCPAN -e shell
$ cpan> install CPAN::Mini

Create a ~/.minicpanrc file:

# CPAN::Mini configuration file
# to set up our local WormBase CPAN

local: /usr/local/wormbase/minicpan
remote: http://mirror.rit.edu/CPAN/
exact_mirror: 1

Set up your CPAN to use the local mirror:

$ cpan
cpan> o conf urllist file:///usr/local/wormbase/minicpan/
cpan> o conf commit

Don't forget cpanplus:

$ cpanp
$ CPAN Terminal> s reconfigure
$ select the System configuration, then the mirror option, custom, and as above. Save and quit.

Set up the minicpan to run once a day:

  • 3 * * * minicpan

Required Perl modules

See the Makefile.PL for a complete list of required Perl modules.

Installation Paths

By convention, 3rd party Perl modules are maintained in an "extlib" directory within each version of the site. This enables us to keep unique sets of libraries for each website.

website/production/extlib - The current production version of the website
website/tharris/extlib - My private development space

To set up your environment, copy the wormbase.env.template file to wormbase.env. Change the $APP variable to match your directory (ie tharris'). Then:

$ source wormbase.env

local::lib

The wormbase.env file uses local::lib to easily set up a local library path. local::lib is already installed into the system Perl path:

 sudo perl -MCPAN -e install 'local::lib'

local::lib dispenses with the need to maintain multiple CPAN configurations or manual tweaks to your environment variables in order to recognize already installed modules.

To set a local installation environment, you would:

$ cd /usr/local/wormbase/website/tharris/extlib
$ perl -Mlocal::lib=./
export MODULEBUILDRC="/usr/local/wormbase/website/tharris/extlib/.modulebuildrc"
export PERL_MM_OPT="INSTALL_BASE=/usr/local/wormbase/website/tharris/extlib"
export PERL5LIB="/usr/local/wormbase/website/tharris/extlib/lib/perl5:/usr/local/wormbase/website/tharris/extlib/lib/perl5/x86_64-linux-gnu-thread-multi:$PERL5LIB"
export PATH="/usr/local/wormbase/website/tharris/extlib/bin:$PATH"
$ eval $(perl -Mlocal::lib=--self-contained,./)

To install a module

$ perl -MCPAN -Mlocal::lib=--self-contained -e 'CPAN::install(MODULE)'

Installing a module without using local::lib

You may on occasion need to install something without using local::lib. For EUMM modules, use

 perl -I/usr/local/wormbase/[PROJECT]/extlib Makefile.PL INSTALL_BASE=/usr/local/wormbase/[PROECT]/extlib

And for Module::Build

 perl -I/usr/local/wormbase/[PROJECT]/extlib Makefile.PL --install_base /usr/local/wormbase/[PROJECT]/extlib 

Alternatively, you can manually edit ~/.cpan/CPAN/MyConfig.pm

Installing WebApp Dependencies

Build all requirements is as easy as:

$ cd /usr/local/wormbase/website/$APP
$ source wormbase.env
$ perl Makefile.PL
$ make installdeps

Note: the wormbase.env should ensure local::lib use /usr/local/wormbase/extlib/ as installation path for packages.

Tips and Tricks

ACePerl

Adjust the values below as necessary for your

[tharris@wb-dev: AcePerl-1.92-BlHove]> sudo perl Makefile.PL

What do you want to build?

 1) Interface to Ace socket server and local databases (pure Perl)
 2) The above plus XS optimizations (requires C compiler)
 3) The above plus RPC server interface (requires C compiler)

Enter your choice: [1] 3

Do you want to install Ace::Browser? [n] y

You have installed Ace::Browser before, using old settings for defaults. Directory for the site-specific configuration files (~username ok): [/usr/local/wormbase/website/tharris/conf/ace] Directory for the acebrowser CGI scripts (~username ok): [/usr/local/wormbase/website/tharris/root/cgi-bin/ace] Directory for the acebrowser HTML files and images (~username ok): [/usr/local/wormbase/website/tharris/root/static/ace]


Some modules may require a little TLC. After running the script you can find source at ~/.cpan/build/module-*

BioPerl

Instead of building BioPerl from CPAN, it might be necessary to build from SVN:

 $ cd /usr/local/wormbase/build
 $ svn co svn+ssh://USERNAME@dev.open-bio.org/home/svn-repositories/bioperl/bioperl-live/trunk bioperl-live
 $ mv bioperl-live bioperl-live-tharris
 $ cd bioperl-live-tharris
 $ perl ./Build.PL install_base /usr/local/wormbase/extlib
 $ ./Build test
 $ ./Build install

DBD::mysql

You will need to specify a test user and test password for tests to pass.

Updating Modules

To show all modules that are out-of-date with those on CPAN:

$ cd /path/to/extlib
$ perl -Mlocal::lib=./
$ eval $(perl -Mlocal::lib=--self-contained,./)
$ perl -MCPAN -e 'CPAN::Shell->r'

To update all of these modules at once:

$ perl -MCPAN -e 'CPAN::Shell->install(CPAN::Shell->r)'

Managing libraries across architectures

Via CPAN bundles

# Create a bundle
$ cd /path/to/extlib
$ perl -Mlocal::lib=./
$ eval $(perl -Mlocal::lib=--self-contained,./)
$ perl -MCPAN -e autobundle   # The bundle is (typically) in extlib
# To reinstall:
$ perl -MCPAN -e 'install Bundle::Snapshot_YYYY_MM_DD_00'

(Or just use the install script).