Introduction to perlbrew

by Kang-min Liu

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Kang-min Liu @gugod

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/me @gugod, ཱུ߁ຽ, Kang-min Liu Web programmer CPAN Author for ~100 distributions http://perlbrew.pl

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/me @gugod, ཱུ߁ຽ, Kang-min Liu { Perl, Ruby, Javascript, HTML, CSS, SQL, Photoshop } programmer CPAN Author for ~100 distributions http://perlbrew.pl

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perlbrew

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←

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← /usr/bin/perl /usr/local/bin/perl /opt/local/bin/perl /home/gugod/local/bin/perl

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← /usr/bin/perl5.8.8 /usr/bin/perl5.10.0 /usr/bin/perl site_lib is preserved after upgrade @INC gets longer and longer.

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The awesomeness perl is very backward compatible Ideal for production keep upgrading perl is generally OK don’t necessarily have to upgrade cpan modules following a perl upgrade.

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The huh CPAN modules are not necessarily backward compatible. XS modules might need to be recompiled with new perl Upgrading modules might not be avoidable.

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The hmm The current CPAN architecture sort of encourages upgrading The default is to install the latest version of modules. Upgrading CPAN modules isn’t necessarily smooth.

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The err Errors happens at runtime XS errors happens at install / compile time and it is ^%@&* to solve.

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Worst of all Have to upgrade perl before doing all that. an all-in-ish move

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Worst of all Dirty state 100 CPAN modules are updated 1 failed Can’t easily revert

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retreat cp /usr/bin/perl${old} /usr/bin/perl old perl does not contain new site_lib

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But what if Upgrade perl for... performance bug-fixes evaluation

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Practicals Module authors have to correctly specify module dependencies. Module users have to run tests in order to reveal runtime errors. assuming there are sufficient numbers of tests

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perlbrew A tool to install different versions of perls

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admin-free perl installation management

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beer-driven software development

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rvm 1.8, 1.9, ree, jruby, rubinus, macruby, maglev, ironruby

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perlbrew 5.8, 5.9, 5.10, 5.11, 5.12, 5.13, 5.14, 5.15

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Installation # 1 curl -kL http://xrl.us/perlbrewinstall | bash # 2 cpan -i App::perlbrew perlbrew init

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Usage perlbrew install perl-5.12.2 perlbrew install perl-5.13.5 perlbrew install perl-5.10.1 perlbrew install perl-5.8.8 * Internet connection is required

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Usage perlbrew use perl-5.14.2 perlbrew use perl-5.15.5 perlbrew switch perl-5.14.2 perlbrew off

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Usage perlbrew list

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> perlbrew list perl-5.10.0 perl-5.10.1 perl-5.10.1 perl-5.12.3 perl-5.14.1 * perl-5.14.2 perl-5.14.2@app-awesome perl-5.15.3

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Usage perlbrew lib

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Usage perlbrew lib list perlbrew lib create nobita perlbrew lib create perl-5.14.2@nobita perlbrew use perl-5.14.2@nobita perlbrew lib delete perl-5.12.3@nobita

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cd ~/src/App-Awesome perlbrew use perl-5.10.1@app-awesome perlbrew use perl-5.14.2@app-awesome cd ~/src/Module-Awesome perlbrew use perl-5.10.1@nobita perlbrew use perl-5.14.1@nobita perlbrew use perl-5.14.2@nobita

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perlbrew use perl-5.10.1@app-awesome

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perlbrew use perl-5.10.1@app-awesome perl installation name

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perlbrew use perl-5.10.1@app-awesome local::lib name

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perlbrew use perl-5.10.1@app-awesome

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eval `perl -Mlocal::lib=~/.perlbrew/ libs/perl-5.10.1@app-awesome/`

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% perl -V ... Compiled at Sep 27 2011 14:08:36 %ENV: PERL5LIB="/Users/gugod/.perlbrew/libs/perl-5.14.2@app-awesome/lib/perl5/darwin-2level:/ Users/gugod/.perlbrew/libs/perl-5.14.2@app-awesome/lib/perl5" PERLBREW_BASHRC_VERSION="0.30," PERLBREW_HOME="/Users/gugod/.perlbrew" PERLBREW_LIB="app-awesome" PERLBREW_PATH="/Users/gugod/.perlbrew/libs/perl-5.14.2@app-awesome/bin:/Users/gugod/ perl5/perlbrew/bin:/Users/gugod/perl5/perlbrew/perls/perl-5.14.2/bin" PERLBREW_PERL="perl-5.14.2" PERLBREW_ROOT="/Users/gugod/perl5/perlbrew" PERLBREW_VERSION="0.30" PERL_LOCAL_LIB_ROOT="/Users/gugod/.perlbrew/libs/perl-5.14.2@app-awesome" PERL_MB_OPT="--install_base /Users/gugod/.perlbrew/libs/perl-5.14.2@app-awesome" PERL_MM_OPT="INSTALL_BASE=/Users/gugod/.perlbrew/libs/perl-5.14.2@app-awesome" @INC: /Users/gugod/.perlbrew/libs/perl-5.14.2@app-awesome/lib/perl5/darwin-2level /Users/gugod/.perlbrew/libs/perl-5.14.2@app-awesome/lib/perl5 /Users/gugod/perl5/perlbrew/perls/perl-5.14.2/lib/site_perl/5.14.2/darwin-2level /Users/gugod/perl5/perlbrew/perls/perl-5.14.2/lib/site_perl/5.14.2 /Users/gugod/perl5/perlbrew/perls/perl-5.14.2/lib/5.14.2/darwin-2level /Users/gugod/perl5/perlbrew/perls/perl-5.14.2/lib/5.14.2

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perlbrew.pl 0.30

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Properties isolated perl installations bin, site_lib, local::lib install a new version ≠ upgrade @INC does not include old site_lib

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Benefits `sudo cpan` is no more easier-to-clean perl environments Nuke the whole thing to clean the mess No old @INC

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Benefits per-app isolated perl environments setup. avoid, in advance, any possible incompatible issues with other apps. know your libs

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avoid lib conflicts with what you had install older versions of modules without worries to break other app code. cpanm http://URL.TO/Mo-0.1.tar.gz App::pmuninstall Benefits

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Rationale Don’t mess up vendor perl too much. Learn new stuffs in the dev version of perl. keep up with the fashion

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Rationale Test modules or apps ... with newer perl ... with older perl

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Rationale Test perl itself -Dusethreads -Duse64bitall -Duse64bitint Configure -h -D -U -A

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Rationale spare some guts B, XS Better with a perl built with DEBUGGING

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Thoughts perlbrew « cpanm, ack, rvm

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Thoughts One standalone program embed non-core modules very easy distribution runs a tiny bit faster

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Thoughts rvm bash programming master-piece developer-friendly experiences production uses

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Further Thoughts Deprecate switch/use to external perl Improve multi-user scenario More related tool to help developer identify module upgrade failure, and revert to a good state.

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Further Thoughts Good + Simple toolkit Keep new-comers by not frustrating them Grow the community

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Simple is Hard

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Development http://github.com/gugod/App-perlbrew 49 contributors Feedback github issue / pull requests rt.cpan.org #perlbrew on twitter

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Development http://perlbrew.pl Documentation / Updates A static version of github Wiki

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Thank You