Introduction to perlbrew

The perlbrew introduction talk I gave in YAPC::Asia 2011.

Transcript

2. Kang-min Liu @gugod
3. /me @gugod, ཱུ߁ຽ, Kang-min Liu Web programmer CPAN Author for ~100 distributions http://perlbrew.pl
4. /me @gugod, ཱུ߁ຽ, Kang-min Liu { Perl, Ruby, Javascript, HTML, CSS, SQL, Photoshop } programmer CPAN Author for ~100 distributions http://perlbrew.pl
5. perlbrew
6. ←
7. ← /usr/bin/perl /usr/local/bin/perl /opt/local/bin/perl /home/gugod/local/bin/perl
8. ← /usr/bin/perl5.8.8 /usr/bin/perl5.10.0 /usr/bin/perl site_lib is preserved after upgrade @INC gets longer and longer.
9. 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.
10. 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.
11. 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.
12. The err Errors happens at runtime XS errors happens at install / compile time and it is ^%@&* to solve.
13. Worst of all Have to upgrade perl before doing all that. an all-in-ish move
14. Worst of all Dirty state 100 CPAN modules are updated 1 failed Can’t easily revert
15. retreat cp /usr/bin/perl${old} /usr/bin/perl old perl does not contain new site_lib
16. But what if Upgrade perl for... performance bug-fixes evaluation
17. 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
18. !
19. perlbrew A tool to install different versions of perls
20. admin-free perl installation management
21. beer-driven software development
22. rvm 1.8, 1.9, ree, jruby, rubinus, macruby, maglev, ironruby
23. perlbrew 5.8, 5.9, 5.10, 5.11, 5.12, 5.13, 5.14, 5.15
24. Installation # 1 curl -kL http://xrl.us/perlbrewinstall | bash # 2 cpan -i App::perlbrew perlbrew init
25. 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
26. Usage perlbrew use perl-5.14.2 perlbrew use perl-5.15.5 perlbrew switch perl-5.14.2 perlbrew off
27. Usage perlbrew list
28. > 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
29. Usage perlbrew lib
30. 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
31. 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
32. perlbrew use perl-5.10.1@app-awesome
33. perlbrew use perl-5.10.1@app-awesome perl installation name
34. perlbrew use perl-5.10.1@app-awesome local::lib name
35. perlbrew use perl-5.10.1@app-awesome
36. eval `perl -Mlocal::lib=~/.perlbrew/ libs/perl-5.10.1@app-awesome/`
37. % 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
38. perlbrew.pl 0.30
39. Properties isolated perl installations bin, site_lib, local::lib install a new version ≠ upgrade @INC does not include old site_lib
40. Benefits `sudo cpan` is no more easier-to-clean perl environments Nuke the whole thing to clean the mess No old @INC
41. Benefits per-app isolated perl environments setup. avoid, in advance, any possible incompatible issues with other apps. know your libs
42. 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
43. Rationale Don’t mess up vendor perl too much. Learn new stuffs in the dev version of perl. keep up with the fashion
44. Rationale Test modules or apps ... with newer perl ... with older perl
45. Rationale Test perl itself -Dusethreads -Duse64bitall -Duse64bitint Configure -h -D -U -A
46. Rationale spare some guts B, XS Better with a perl built with DEBUGGING
47. Thoughts perlbrew « cpanm, ack, rvm
48. Thoughts One standalone program embed non-core modules very easy distribution runs a tiny bit faster
49. Thoughts rvm bash programming master-piece developer-friendly experiences production uses
50. 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.
51. Further Thoughts Good + Simple toolkit Keep new-comers by not frustrating them Grow the community
52. Simple is Hard
53. Development http://github.com/gugod/App-perlbrew 49 contributors Feedback github issue / pull requests rt.cpan.org #perlbrew on twitter
54. Development http://perlbrew.pl Documentation / Updates A static version of github Wiki
55. Thank You