How to get bundle_path from rbenv setting in Capistrano deploy.rb?

Question

Since I have require capistrano-bundler and capistrano-rbenv gems, and have set as follow in deploy.rb file:

    # rbenv
    set :rbenv_type, :user
    set :rbenv_ruby, '2.0.0-p645'
    set :rbenv_prefix, "RBENV_ROOT=#{fetch(:rbenv_path)} RBENV_VERSION=#{fetch(:rbenv_ruby)} #{fetch(:rbenv_path)}/bin/rbenv exec"
    set :rbenv_map_bins, %w{rake gem bundle ruby rails}

    # bundler
    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('Gemfile') }        # default: nil
    set :bundle_path, -> { shared_path.join('bundle') }             # this is default
    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

Clearly bundle_path is not in shared subpath, it should be /home/deploy/.rbenv/shims/bundle . So how can I get that path after I have set rbenv's settings. I struggle for a long time but found nothing both on github or google.com .

Thx.

Answer 1

To get rbenv's gem path you can do rbenv exec gem environment gemdir .

However, I think the problem comes from the combination of the :bundle_path , :bundle_flags settings, and how bundler interacts with rbenv.

Because of the --deployment option (set in :bundle_flags ), the installed gems won't install their binaries in rbenv's system gemdir, but on app/shared/bundle , so you won't get them in your $PATH .

To fix this, you need to add your command to both :rbenv_map_bins and :bundle_bins so that it is properly prefixed.

For example, for jekyll, you need to set:

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

This makes the command executed by capistrano to be something like

RBENV_ROOT=#{fetch(:rbenv_path)} RBENV_VERSION=#{fetch(:rbenv_ruby)} #{fetch(:rbenv_path)}/bin/rbenv exec bundle exec jekyll

which will work because bundle is in :rbenv_map_bins and bundle install --deployment creates a .bundler/config file that sets the path to app/share/bundle