add node default so it will compile

ruby.rb

# ruby-install
ruby_install_version = node["ruby_install"]["version"]
ruby_install_url     = "https://github.com/postmodern/ruby-install/archive/v#{ruby_install_version}.tar.gz"
ruby_install_dir     = "ruby-install-#{ruby_install_version}"
ruby_install_tar     = "#{ruby_install_dir}.tar.gz"

execute "Install ruby-install" do
  cwd "/tmp"
  command <<-EOC
    curl -Lo #{ruby_install_tar} #{ruby_install_url} &&
    tar -xzvf #{ruby_install_tar} &&
    cd #{ruby_install_dir} &&
    make install
  EOC
  creates "/usr/local/bin/ruby-install"
end


# chruby
chruby_version = node["chruby"]["version"]
chruby_url     = "https://github.com/postmodern/chruby/archive/v#{chruby_version}.tar.gz"
chruby_dir     = "chruby-#{chruby_version}"
chruby_tar     = "#{chruby_dir}.tar.gz"

execute "Install chruby" do
  cwd "/tmp"
  command <<-EOC
    curl -Lo #{chruby_tar} #{chruby_url} &&
    tar -xzvf #{chruby_tar} &&
    cd #{chruby_dir} &&
    make install
  EOC
  creates "/usr/local/bin/chruby-exec"
end

# load chruby globally and enable auto-switch
file "/etc/profile.d/chruby.sh" do
  owner "root"
  group "root"
  mode "0755"
  action :create_if_missing
  content <<-EOS
    source /usr/local/share/chruby/chruby.sh
    source /usr/local/share/chruby/auto.sh
  EOS
end


# where the ruby attrs look something like this (engine => array of versions)
# chruby: {
#   rubies: {
#     "ruby" => ["2.0.0-p247"]
#   }
# }

# need to specify default node value or code below won't compile
node.default["chruby"]["rubies"] = {ruby: []}

node["chruby"]["rubies"].each do |ruby_vm, ruby_versions|
  ruby_versions.each do |ruby_version|
    execute "Install #{ruby_vm} #{ruby_version}" do
      command "ruby-install #{ruby_vm} #{ruby_version}"
      creates "/opt/rubies/#{ruby_vm}-#{ruby_version}/bin/ruby"
    end
  end
end