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クービックAdvent Calendar 2015

Day 5

itamaeでホームディレクトリにrbenv環境を構築する

Last updated at Posted at 2015-12-04

itamaeでホームディレクトリにrbenv環境を構築する事例がウェブに見当たらなかったので、サロン当日予約アプリPopcorn で採用した方法をご紹介します。

なお、環境は Ubuntu 14.04 ですが、どの OS でも大丈夫なはずです(たぶん)。

完成したレシピ

# cookbooks/ruby/default.rb

include_recipe './attributes/default.rb'

rbenv_dir          = node['rbenv']['root_dir']
rbenv_versions     = node['rbenv']['versions']
rbenv_version      = node['rbenv']['version']
rbenv_owner        = node['rbenv']['owner']
rbenv_group        = node['rbenv']['group']
sudo               = "sudo -u #{rbenv_owner} -i"

git rbenv_dir do
  repository 'git://github.com/sstephenson/rbenv.git'
end

directory "#{rbenv_dir}/plugins" do
  not_if "test -d #{rbenv_dir}/plugins"
end

git "#{rbenv_dir}/plugins/ruby-build" do
  repository "git://github.com/sstephenson/ruby-build.git"
end

execute "chown #{rbenv_dir}" do
  command "chown -R #{rbenv_owner}:#{rbenv_group} #{rbenv_dir}"
end

rbenv_versions.each do |version|
  execute "rbenv install #{version}" do
    command "#{sudo} rbenv install #{version}"
    not_if  "#{sudo} rbenv versions | grep #{version}"
  end
end

execute "rbenv local #{rbenv_version}" do
  command "#{sudo} rbenv local #{rbenv_version}"
end

execute "rbenv global #{rbenv_version}" do
  command "#{sudo} rbenv global #{rbenv_version}"
end

execute "gem install bundler" do
  command "#{sudo} gem install bundler"
  not_if  "#{sudo} gem list | grep bundler"
end

工夫したポイントをいくつかご紹介します。

node attributes

node.reverse_merge! を使って、デフォルトを設定しています。

node.reverse_merge!(
  rbenv: {
    root_dir: '/home/kotaroito/.rbenv',
    owner: 'kotaroito',
    group: 'kotaroito',
    versions: %w(2.1.4),
    version: '2.1.4'
  }
)

詳しくは、itamae作者の荒井さんが http://gihyo.jp/admin/serial/01/itamae/0003 にて説明してくださっています。

sudo

sudo = "sudo -u #{rbenv_owner} -i"

sudo で -u と -i オプションを指定しています。

-i, --login

 Run the shell specified by the target user's password database entry as a login shell. This means that login-specific resource files such as .profile or .login will be read by the shell.  If a command is specified, it is passed to the shell for execution via the shell's -c option.....
-u user, --user=user

  Run the command as a user other than the default target user (usually root )....

これらオプションによって、~/.bash_profile を読み込んでくれるので、rbenv install や gem install bundler を node attributes で指定したユーザで実行することができます。

以上です。

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