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Capistrano::Bundler

Bundler specific tasks for Capistrano v3:

$ cap production bundler:install

It also prefixes certain binaries to use bundle exec.

Installation

Add these lines to your application's Gemfile:

gem 'capistrano', '~> 3.6'
gem 'capistrano-bundler', '~> 1.2'

And then execute:

$ bundle

Or install it yourself as:

$ gem install capistrano-bundler

Usage

Require in Capfile to use the default task:

require 'capistrano/bundler'

The task will run before deploy:updated as part of Capistrano's default deploy, or can be run in isolation with cap production bundler:install

By default, the plugin adds bundle exec prefix to common executables listed in bundle_bins option. This currently applies for gem, rake and rails.

You can add any custom executable to this list:

set :bundle_bins, fetch(:bundle_bins, []).push('my_new_binary')

Configurable options:

set :bundle_roles, :all                                         # this is default
set :bundle_servers, -> { release_roles(fetch(:bundle_roles)) } # this is default
set :bundle_binstubs, -> { shared_path.join('bin') }            # default: nil
set :bundle_gemfile, -> { release_path.join('MyGemfile') }      # default: nil
set :bundle_path, -> { shared_path.join('bundle') }             # this is default. set it to nil for skipping the --path flag.
set :bundle_without, %w{development test}.join(' ')             # this is default
set :bundle_flags, '--deployment --quiet'                       # this is default
set :bundle_env_variables, {}                                   # this is default
set :bundle_clean_options, ""                                   # this is default. Use "--dry-run" if you just want to know what gems would be deleted, without actually deleting them

You can parallelize the installation of gems with bundler's jobs feature. Choose a number less or equal than the number of cores your server.

set :bundle_jobs, 4 # default: nil, only available for Bundler >= 1.4

To generate binstubs on each deploy, set :bundle_binstubs path:

set :bundle_binstubs, -> { shared_path.join('bin') }

In the result this would execute the following bundle command on all servers (actual paths depend on the real deploy directory):

$ bundle install \
  --binstubs /my_app/shared/bin \
  --gemfile /my_app/releases/20130623094732/MyGemfile \
  --path /my_app/shared/bundle \
  --without development test \
  --deployment --quiet

If any option is set to nil it will be excluded from the final bundle command.

If you want to clean up gems after a successful deploy, add after 'deploy:published', 'bundler:clean' to config/deploy.rb.

Downsides to cleaning:

  • If a rollback requires rebuilding a Gem with a large compiled binary component, such as Nokogiri, the rollback will take a while.
  • In rare cases, if a gem that was used in the previously deployed version was yanked, rollback would entirely fail.

Environment Variables

The bundle_env_variables option can be used to specify any environment variables you want present when running the bundle command:

# This translates to NOKOGIRI_USE_SYSTEM_LIBRARIES=1 when executed
set :bundle_env_variables, { nokogiri_use_system_libraries: 1 }

Contributing

  1. Fork it
  2. Create your feature branch (git checkout -b my-new-feature)
  3. Commit your changes (git commit -am 'Add some feature')
  4. Push to the branch (git push origin my-new-feature)
  5. Create new Pull Request