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Using RVM with Capistrano

Benefits of integration

Integrating RVM with Capistrano provides the normal benefits of RVM when operating in the context of Capistrano deployment tasks. These include:

Integration choices

There are four choices, listed below from newest to oldest. The first is preferred because it reduces configuration and does not contain hardcoded paths.

Use the rvm-capistrano gem

Please refer to the gem. Note that in this configuration RVM will not be automatically loaded as a shell function, although the executable will be available in the PATH. For the differences between the situations, please see scripting.

Use the built-in capistrano plugin (outdated)

RVM >= 1.0.1 includes a built-in plugin (not a gem) for capistrano support. This configuration is nearly identical to the gem approach above, except that an extra line is required to add RVM's lib directory to the load path so that the plugin can be found:

# Choose a Ruby explicitly, or read from an environment variable.
set :rvm_ruby_string, 'ree@rails3'
# set :rvm_ruby_string, ENV['GEM_HOME'].gsub(/.*\//,'') 

# Add RVM's lib directory to the load path.
$:.unshift(File.expand_path('./lib', ENV['rvm_path']))

# Load RVM's capistrano plugin.
require 'rvm/capistrano'

Please note, by default the plugin uses a system installation of RVM, which is the exact opposite of the gem's default installation mode. To instead set it to use a per-user (non-root) install, add the following to either your Capfile or deploy.rb :

set :rvm_type, :user  # Literal ":user"

Use the Capistrano :default_environment setting (hardcore)

For this option, add the following line in your deploy.rb file, adjusting to your particular rvm ruby of course:

set :default_environment, {
  'PATH' => "/path/to/.rvm/gems/ree/1.8.7/bin:/path/to/.rvm/bin:/path/to/.rvm/ree-1.8.7-2009.10/bin:$PATH",
  'RUBY_VERSION' => 'ruby 1.8.7',
  'GEM_HOME'     => '/path/to/.rvm/gems/ree-1.8.7-2010.01',
  'GEM_PATH'     => '/path/to/.rvm/gems/ree-1.8.7-2010.01',
  'BUNDLE_PATH'  => '/path/to/.rvm/gems/ree-1.8.7-2010.01'  # If you are using bundler.
}

To get the accurate locations have a look inside ~/.rvm/config/default

To configure Capistrano to automatically trust project .rvmrc files on deployment, add the following to your config/deploy.rb :

namespace :rvm do
  task :trust_rvmrc do
    run "rvm rvmrc trust #{release_path}"
  end
end

And then use Capistrano's hooks capabilities, by adding an after hook to launch it.

after "deploy", "rvm:trust_rvmrc"