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Introduction to perlbrew
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Kang-min Liu
October 13, 2011
Technology
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1.7k
Introduction to perlbrew
The perlbrew introduction talk I gave in YAPC::Asia 2011.
Kang-min Liu
October 13, 2011
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Transcript
None
Kang-min Liu @gugod
/me @gugod, ཱུ߁ຽ, Kang-min Liu Web programmer CPAN Author for
~100 distributions http://perlbrew.pl
/me @gugod, ཱུ߁ຽ, Kang-min Liu { Perl, Ruby, Javascript, HTML,
CSS, SQL, Photoshop } programmer CPAN Author for ~100 distributions http://perlbrew.pl
perlbrew
←
← /usr/bin/perl /usr/local/bin/perl /opt/local/bin/perl /home/gugod/local/bin/perl
← /usr/bin/perl5.8.8 /usr/bin/perl5.10.0 /usr/bin/perl site_lib is preserved after upgrade @INC
gets longer and longer.
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.
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.
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.
The err Errors happens at runtime XS errors happens at
install / compile time and it is ^%@&* to solve.
Worst of all Have to upgrade perl before doing all
that. an all-in-ish move
Worst of all Dirty state 100 CPAN modules are updated
1 failed Can’t easily revert
retreat cp /usr/bin/perl${old} /usr/bin/perl old perl does not contain new
site_lib
But what if Upgrade perl for... performance bug-fixes evaluation
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
!
perlbrew A tool to install different versions of perls
admin-free perl installation management
beer-driven software development
rvm 1.8, 1.9, ree, jruby, rubinus, macruby, maglev, ironruby
perlbrew 5.8, 5.9, 5.10, 5.11, 5.12, 5.13, 5.14, 5.15
Installation # 1 curl -kL http://xrl.us/perlbrewinstall | bash # 2
cpan -i App::perlbrew perlbrew init
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
Usage perlbrew use perl-5.14.2 perlbrew use perl-5.15.5 perlbrew switch perl-5.14.2
perlbrew off
Usage perlbrew list
> 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
Usage perlbrew lib
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
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
perlbrew use perl-5.10.1@app-awesome
perlbrew use perl-5.10.1@app-awesome perl installation name
perlbrew use perl-5.10.1@app-awesome local::lib name
perlbrew use perl-5.10.1@app-awesome
eval `perl -Mlocal::lib=~/.perlbrew/ libs/perl-5.10.1@app-awesome/`
% 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
perlbrew.pl 0.30
Properties isolated perl installations bin, site_lib, local::lib install a new
version ≠ upgrade @INC does not include old site_lib
Benefits `sudo cpan` is no more easier-to-clean perl environments Nuke
the whole thing to clean the mess No old @INC
Benefits per-app isolated perl environments setup. avoid, in advance, any
possible incompatible issues with other apps. know your libs
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
Rationale Don’t mess up vendor perl too much. Learn new
stuffs in the dev version of perl. keep up with the fashion
Rationale Test modules or apps ... with newer perl ...
with older perl
Rationale Test perl itself -Dusethreads -Duse64bitall -Duse64bitint Configure -h -D
-U -A
Rationale spare some guts B, XS Better with a perl
built with DEBUGGING
Thoughts perlbrew « cpanm, ack, rvm
Thoughts One standalone program embed non-core modules very easy distribution
runs a tiny bit faster
Thoughts rvm bash programming master-piece developer-friendly experiences production uses
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.
Further Thoughts Good + Simple toolkit Keep new-comers by not
frustrating them Grow the community
Simple is Hard
Development http://github.com/gugod/App-perlbrew 49 contributors Feedback github issue / pull requests
rt.cpan.org #perlbrew on twitter
Development http://perlbrew.pl Documentation / Updates A static version of github
Wiki
Thank You