bundle-install-only

#!/usr/bin/env ruby
ENV['BUNDLE_GEMFILE'] ||= File.expand_path('../../Gemfile', __FILE__)
ENV["BUNDLE_IGNORE_CONFIG"] = 'true'

install_only = ARGV.to_a.map(&:to_sym)
install_only = [:host] if install_only.empty?

require 'bundler'

Bundler.configure

gemfile = Pathname.new(Bundler.default_gemfile).expand_path
builder = Bundler::Dsl.new
builder.eval_gemfile(gemfile)

all_groups = builder.dependencies.map(&:groups).flatten.uniq
groups_to_skip = all_groups - install_only
Bundler.settings.without = groups_to_skip
Bundler.settings.with = install_only

definition = builder.to_definition(Bundler.default_lockfile, {})
def definition.lock(*); end # never lock or preserve options
definition.validate_ruby!

Bundler.ui = Bundler::UI::Shell.new

Bundler::Installer.install(Bundler.root, definition, system: true)

module Bundler; module CLI; end; end
def confirm_without_groups
  if Bundler.settings.without.any?
    require 'bundler/cli/common'
    Bundler.ui.confirm Bundler::CLI::Common.without_groups_message
  end
end

def dependencies_count_for(definition)
  count = definition.dependencies.count
  "#{count} Gemfile #{count == 1 ? 'dependency' : 'dependencies'}"
end

def gems_installed_for(definition)
  count = definition.specs.count
  "#{count} #{count == 1 ? 'gem' : 'gems'} now installed"
end

def print_post_install_message(name, msg)
  Bundler.ui.confirm "Post-install message from #{name}:"
  Bundler.ui.info msg
end

Bundler.ui.confirm "Bundle complete! #{dependencies_count_for(definition)}, #{gems_installed_for(definition)}."
confirm_without_groups

Bundler::Installer.post_install_messages.each do |name, message|
  print_post_install_message(name, message)
end

awesome. I think this is exactly what i needed :) Thank you very much.