Carmel at YAPC::EU 2015

Transcript

1. Carmel Yet another CPAN dependencies management tool Tatsuhiko Miyagawa YAPC::EU 2015
2. Me • MIYAGAWA, @miyagawa • San Francisco, CA, United States • Perl, Ruby
3. Agenda • Why manage CPAN dependencies • Introduction of tools • Demo • Future Plans
4. Carton Bundler(-ish) for Perl
6. (quick recap)
7.  @local>  cpanm  Poles   Installed  Poles-­‐1.0.tar.gz   @remote>  cpanm  Poles   Installed  Poles-­‐2.1.tar.gz
9. “Updating CPAN modules broke my app”
10. Takeaway • CPAN dependencies = Your app • Describe it • Manage it • Version Control it
11. cpanfile
12. cpanfile • DSL to describe CPAN dependencies • Version Range, Phases • a la Gemfile • Module::CPANfile • Supported by many tools (cpanm)
13. requires  'Plack',  '1.001';   requires  'Mojolicious',  '==  6.17';   on  'develop'  =>  sub  {      requires  'Devel::NYTProf';   };   on  'test'  =>  sub  {      requires  'Test::More';      requires  'Test::mysql';   };
14. requires  'Plack',  '1.001';   requires  'Mojolicious',  '==  6.17';   on  'develop'  =>  sub  {      requires  'Devel::NYTProf';   };   on  'test'  =>  sub  {      requires  'Test::More';      requires  'Test::mysql';   };
15. requires  'Plack',  '1.001';   requires  'Mojolicious',  '==  6.17';   on  'develop'  =>  sub  {      requires  'Devel::NYTProf';   };   on  'test'  =>  sub  {      requires  'Test::More';      requires  'Test::mysql';   };
16. >  cpanm  -­‐-­‐installdeps  .
17. cpanm + cpanfile • Grabs latest versions that satisfy ranges • '== version' can pin versions • cpanmetadb/MetaCPAN SPOF
18. Carton Bundler(-ish) for Perl
19. Carton + cpanfile • Installs into ./local • Creates cpanfile.snapshot • Git friendly • carton  install  -­‐-­‐deployment
20. requires  'Poles',  '1.0';  
21.  @local>  carton  install   Installed  Poles-­‐1.0.tar.gz   @remote>  carton  install  -­‐-­‐deployment   Installed  Poles-­‐1.0.tar.gz
23. Carton 1.0 released in late 2013 1.1 was in the development
25. Carton • Slow for large installs • Relies on cpanm internals • Git support is hard • Update/Rollback is unreliable • -­‐-­‐deployment is confusing • carton  exec doesn't check on development
26. Carmel Yet another Bundler for Perl
27. Carmel • Same UI/UX with Carton • Different internals • Rewritten from scratch • Deeper understandings of how Bundler works • Fast and Reliable
28. blib The core of Carmel
29. How to build a CPAN module • Configure • Build • Test (Optional) • Install
30. How to build a CPAN module • perl  Makefile.PL   • make   • make  test   • make  install
31. ➜  perl  Makefile.PL     Checking  if  your  kit  is  complete...   Looks  good   Generating  a  Unix-­‐style  Makefile   Writing  Makefile  for  Try::Tiny   Writing  MYMETA.yml  and  MYMETA.json   ➜  make   cp  lib/Try/Tiny.pm  blib/lib/Try/Tiny.pm   Manifying  1  pod  document  
32. ➜  perl  Makefile.PL     Checking  if  your  kit  is  complete...   Looks  good   Generating  a  Unix-­‐style  Makefile   Writing  Makefile  for  Try::Tiny   Writing  MYMETA.yml  and  MYMETA.json   ➜  make   cp  lib/Try/Tiny.pm  blib/lib/Try/Tiny.pm   Manifying  1  pod  document  
33. blib/{lib,arch} Can be pushed to @INC   CPAN.pm does it for ages
34. The idea • Builds all modules without installing them • Manages these "blib"s (call them artifacts) • Chooses artifact paths dynamically on dev • Freezes artifact paths statically on prod
35. Carmel Written in a few hours as a hack. Turned into a module at Berlin QA Hackathon.
36. DEMO
37. Commands • carmel install • carmel list/tree • carmel exec • carmel package • carmel rollout • carmel inject <Module>
38. Tools • carmel exec • Carmel::Setup • Carmel::Preload
40. Current status • pre-1.0 • Usable (I use it on cpanmetadb production) • Snapshot support in development
41. >  cpanm  Carmel  
42. >  cpanm  Carmel   Successfully  installed  Menlo-­‐1.9001   Successfully  installed  Carmel-­‐v0.1.25   2  distributions  installed  
43. >  cpanm  Carmel   Successfully  installed  Menlo-­‐1.9001   Successfully  installed  Carmel-­‐v0.1.25   2  distributions  installed  
44. Menlo
45. Menlo "cpanm 2.0"
46. cpanm • Loved by the users • Mixed feelings by the developer (me) • God class, Hard to refactor • Grown out of a pre-fatpack single script • Not extensible
47. Menlo • Modular, Scriptable, Object-Oriented APIs • Plugin Hooks • uses CPAN::Common::* • Extracts the common bits (e.g. HTTP::Tinyish) • Still bootstrappable with fatpack/vendoring
48. >  cpanm  Menlo   >  cpanm-­‐menlo  Plack
49. Current status • github.com/miyagawa/cpanminus @ menlo • New features (static installs) • Pre big refactoring • No plugins
50. 2.0 planned for QAH 2016 ... but with continuous 1.9x releases
51. github.com/miyagawa
52. irc.perl.org #cpanm
53. Thank you. Questions?
54. FAQ • Why Carmel/Menlo? • 1.0/2.0 ETA? • Is Carton deprecated? • What's the purple thing in your avatar?