Carmel at YAPC::EU 2015

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Carmel Yet another CPAN dependencies management tool Tatsuhiko Miyagawa YAPC::EU 2015

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Me • MIYAGAWA, @miyagawa • San Francisco, CA, United States • Perl, Ruby

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Agenda • Why manage CPAN dependencies • Introduction of tools • Demo • Future Plans

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Carton Bundler(-ish) for Perl

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(quick recap)

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@local> cpanm Poles Installed Poles-‐1.0.tar.gz @remote> cpanm Poles Installed Poles-‐2.1.tar.gz

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“Updating CPAN modules broke my app”

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Takeaway • CPAN dependencies = Your app • Describe it • Manage it • Version Control it

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cpanﬁle

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cpanfile • DSL to describe CPAN dependencies • Version Range, Phases • a la Gemfile • Module::CPANfile • Supported by many tools (cpanm)

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requires 'Plack', '1.001'; requires 'Mojolicious', '== 6.17'; on 'develop' => sub { requires 'Devel::NYTProf'; }; on 'test' => sub { requires 'Test::More'; requires 'Test::mysql'; };

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requires 'Plack', '1.001'; requires 'Mojolicious', '== 6.17'; on 'develop' => sub { requires 'Devel::NYTProf'; }; on 'test' => sub { requires 'Test::More'; requires 'Test::mysql'; };

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requires 'Plack', '1.001'; requires 'Mojolicious', '== 6.17'; on 'develop' => sub { requires 'Devel::NYTProf'; }; on 'test' => sub { requires 'Test::More'; requires 'Test::mysql'; };

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> cpanm -‐-‐installdeps .

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cpanm + cpanﬁle • Grabs latest versions that satisfy ranges • '== version' can pin versions • cpanmetadb/MetaCPAN SPOF

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Carton Bundler(-ish) for Perl

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Carton + cpanﬁle • Installs into ./local • Creates cpanﬁle.snapshot • Git friendly • carton install -‐-‐deployment

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requires 'Poles', '1.0';

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@local> carton install Installed Poles-‐1.0.tar.gz @remote> carton install -‐-‐deployment Installed Poles-‐1.0.tar.gz

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Carton 1.0 released in late 2013 1.1 was in the development

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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

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Carmel Yet another Bundler for Perl

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Carmel • Same UI/UX with Carton • Different internals • Rewritten from scratch • Deeper understandings of how Bundler works • Fast and Reliable

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blib The core of Carmel

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How to build a CPAN module • Conﬁgure • Build • Test (Optional) • Install

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How to build a CPAN module • perl Makefile.PL • make • make test • make install

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➜ 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

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blib/{lib,arch} Can be pushed to @INC CPAN.pm does it for ages

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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

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Carmel Written in a few hours as a hack. Turned into a module at Berlin QA Hackathon.

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DEMO

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Commands • carmel install • carmel list/tree • carmel exec • carmel package • carmel rollout • carmel inject

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Tools • carmel exec • Carmel::Setup • Carmel::Preload

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Current status • pre-1.0 • Usable (I use it on cpanmetadb production) • Snapshot support in development

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> cpanm Carmel

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> cpanm Carmel Successfully installed Menlo-‐1.9001 Successfully installed Carmel-‐v0.1.25 2 distributions installed

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> cpanm Carmel Successfully installed Menlo-‐1.9001 Successfully installed Carmel-‐v0.1.25 2 distributions installed

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Menlo

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Menlo "cpanm 2.0"

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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

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Menlo • Modular, Scriptable, Object-Oriented APIs • Plugin Hooks • uses CPAN::Common::* • Extracts the common bits (e.g. HTTP::Tinyish) • Still bootstrappable with fatpack/vendoring

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> cpanm Menlo > cpanm-‐menlo Plack

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Current status • github.com/miyagawa/cpanminus @ menlo • New features (static installs) • Pre big refactoring • No plugins

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2.0 planned for QAH 2016 ... but with continuous 1.9x releases

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github.com/miyagawa

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irc.perl.org #cpanm

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Thank you. Questions?

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FAQ • Why Carmel/Menlo? • 1.0/2.0 ETA? • Is Carton deprecated? • What's the purple thing in your avatar?