====== RVM(Ruby Version Manager)によるRubyのインストール ======

===== RVM(Ruby Version Manager) のインストール =====
<code>
$ gpg2 --recv-keys 409B6B1796C275462A1703113804BB82D39DC0E3 7D2BAF1CF37B13E2069D6956105BD0E739499BDB
$ \curl -sSL https://get.rvm.io | bash -s stable
</code>
<code>
# tomoyan,
#
#   Thank you for using RVM!
#   We sincerely hope that RVM helps to make your life easier and more enjoyable!!!
#
# ~Wayne, Michal & team.

In case of problems: http://rvm.io/help and https://twitter.com/rvm_io

Upgrade Notes:


  * WARNING: You have '~/.profile' file, you might want to load it,
    to do that add the following line to '/home/tomoyan/.bash_profile':

      source ~/.profile

  * No new notes to display.

</code>
インストールが完了したら rvm を読み込む。
<code>
$ source ~/.bash_profile
$ rvm version
</code>
<code>
rvm 1.26.11 (latest) by Wayne E. Seguin <wayneeseguin@gmail.com>, Michal Papis <mpapis@gmail.com> [https://rvm.io/]
</code>

===== Ruby のビルドに必要なパッケージのインストール =====
<code>
$ mkdir ~/work
$ cd ~/work
$ yumdownloader --source ruby
$ sudo yum-builddep ruby-2.2.2-40.fc22.src.rpm
</code>

===== Ruby のインストール =====
<code>
$ rvm install 2.2.2
</code>
<code>
$ rvm install 2.2.2
Searching for binary rubies, this might take some time.
No binary rubies available for: fedora/22/x86_64/ruby-2.2.2.
Continuing with compilation. Please read 'rvm help mount' to get more information on binary rubies.
Checking requirements for fedora.
Installing requirements for fedora.
Installing required packages: libtool, bison..tomoyan password required for 'yum install -y libtool bison': 
.....
Requirements installation successful.
Installing Ruby from source to: /home/tomoyan/.rvm/rubies/ruby-2.2.2, this may take a while depending on your cpu(s)...
ruby-2.2.2 - #downloading ruby-2.2.2, this may take a while depending on your connection...
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100 12.6M  100 12.6M    0     0   131k      0  0:01:39  0:01:39 --:--:--  247k
No checksum for downloaded archive, recording checksum in user configuration.
ruby-2.2.2 - #extracting ruby-2.2.2 to /home/tomoyan/.rvm/src/ruby-2.2.2....
ruby-2.2.2 - #configuring.........................................................
ruby-2.2.2 - #post-configuration..
ruby-2.2.2 - #compiling................................................................................
ruby-2.2.2 - #installing..................
ruby-2.2.2 - #making binaries executable..
ruby-2.2.2 - #downloading rubygems-2.4.8
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100  437k  100  437k    0     0   179k      0  0:00:02  0:00:02 --:--:--  179k
No checksum for downloaded archive, recording checksum in user configuration.
ruby-2.2.2 - #extracting rubygems-2.4.8....
ruby-2.2.2 - #removing old rubygems.........
ruby-2.2.2 - #installing rubygems-2.4.8......................
ruby-2.2.2 - #gemset created /home/tomoyan/.rvm/gems/ruby-2.2.2@global
ruby-2.2.2 - #importing gemset /home/tomoyan/.rvm/gemsets/global.gems...............................................
ruby-2.2.2 - #generating global wrappers........
ruby-2.2.2 - #gemset created /home/tomoyan/.rvm/gems/ruby-2.2.2
ruby-2.2.2 - #importing gemsetfile /home/tomoyan/.rvm/gemsets/default.gems evaluated to empty gem list
ruby-2.2.2 - #generating default wrappers........
ruby-2.2.2 - #adjusting #shebangs for (gem irb erb ri rdoc testrb rake).
Install of ruby-2.2.2 - #complete 
Ruby was built without documentation, to build it run: rvm docs generate-ri
</code>

===== Ruby バージョンの切り替え =====
Ruby 2.2.2 をデフォルトにする。
<code>
$ rvm use 2.2.2 --default
Using /home/tomoyan/.rvm/gems/ruby-2.2.2
$ ruby -v
ruby 2.2.2p95 (2015-04-13 revision 50295) [x86_64-linux]
</code>