NAME

       Carton - Perl module dependency manager (aka Bundler for Perl)

SYNOPSIS

         # On your development environment
         > cat cpanfile
         requires 'Plack', '0.9980';
         requires 'Starman', '0.2000';

         > carton install
         > git add cpanfile cpanfile.snapshot
         > git commit -m "add Plack and Starman"

         # Other developer's machine, or on a deployment box
         > carton install
         > carton exec starman -p 8080 myapp.psgi

AVAILABILITY

       Carton only works with perl installation with the complete set of core modules. If you use
       perl installed by a vendor package with modules stripped from core, Carton is not expected
       to work correctly.

       Also, Carton requires you to run your command/application with "carton exec" command,
       which means it's difficult or impossible to run in an embedded perl use case such as
       mod_perl.

DESCRIPTION

       carton is a command line tool to track the Perl module dependencies for your Perl
       application. Dependencies are declared using cpanfile format, and the managed dependencies
       are tracked in a cpanfile.snapshot file, which is meant to be version controlled, and the
       snapshot file allows other developers of your application will have the exact same
       versions of the modules.

       For "cpanfile" syntax, see cpanfile documentation.

TUTORIAL

   Initializing the environment
       carton will use the local directory to install modules into. You're recommended to exclude
       these directories from the version control system.

         > echo local/ >> .gitignore
         > git add cpanfile cpanfile.snapshot
         > git commit -m "Start using carton"

   Tracking the dependencies
       You can manage the dependencies of your application via "cpanfile".

         # cpanfile
         requires 'Plack', '0.9980';
         requires 'Starman', '0.2000';

       And then you can install these dependencies via:

         > carton install

       The modules are installed into your local directory, and the dependencies tree and version
       information are analyzed and saved into cpanfile.snapshot in your directory.

       Make sure you add cpanfile and cpanfile.snapshot to your version controlled repository and
       commit changes as you update dependencies. This will ensure that other developers on your
       app, as well as your deployment environment, use exactly the same versions of the modules
       you just installed.

         > git add cpanfile cpanfile.snapshot
         > git commit -m "Added Plack and Starman"

   Deploying your application
       Once you've done installing all the dependencies, you can push your application directory
       to a remote machine (excluding local and .carton) and run the following command:

         > carton install --deployment

       This will look at the cpanfile.snapshot and install the exact same versions of the
       dependencies into local, and now your application is ready to run.

       The "--deployment" flag makes sure that carton will only install modules and versions
       available in your snapshot, and won't fallback to query for CPAN Meta DB for missing
       modules.

   Bundling modules
       carton can bundle all the tarballs for your dependencies into a directory so that you can
       even install dependencies that are not available on CPAN, such as internal distribution
       aka DarkPAN.

         > carton bundle

       will bundle these tarballs into vendor/cache directory, and

         > carton install --cached

       will install modules using this local cache. Combined with "--deployment" option, you can
       avoid querying for a database like CPAN Meta DB or downloading files from CPAN mirrors
       upon deployment time.

PERL VERSIONS

       When you take a snapshot in one perl version and deploy on another (different) version,
       you might have troubles with core modules.

       The simplest solution, which might not work for everybody, is to use the same version of
       perl in the development and deployment.

       To enforce that, you're recommended to use plenv and ".perl-version" to lock perl versions
       in development.

       You can also specify the minimum perl required in "cpanfile":

         requires 'perl', '5.16.3';

       and carton (and cpanm) will give you errors when deployed on hosts with perl lower than
       the specified version.

COMMUNITY

       <https://github.com/miyagawa/carton>
           Code repository, Wiki and Issue Tracker

       <irc://irc.perl.org/#carton>
           IRC chat room

AUTHOR

       Tatsuhiko Miyagawa

COPYRIGHT

       Tatsuhiko Miyagawa 2011-

LICENSE

       This software is licensed under the same terms as Perl itself.

SEE ALSO

       cpanm

       cpanfile

       Bundler <http://gembundler.com/>

       pip <http://pypi.python.org/pypi/pip>

       npm <http://npmjs.org/>

       perlrocks <https://github.com/gugod/perlrocks>

       only