<Mac> 色んなバージョンのRubyを使い分けるため「rbenv」をインストールする
やりたいこと
バージョンの異なるRubyを、一つの環境で使い分けたい。
インストール方法
Homebrewを使って、rbenvをインストールする。
$ brew install rbenv Updating Homebrew... ==> Auto-updated Homebrew! Updated 1 tap (homebrew/core). ==> New Formulae gmic jsonlint mfterm minimesos treefrog ttygif twarc ==> Updated Formulae advancecomp generate-json-schema librdkafka runit ammonite-repl git-annex mailutils rust apache-spark goaccess micropython sassc armor grails mkdocs scala ats2-postiats graphite2 mksh sdl_image aws-sdk-cpp gtk-gnutella mlt shellinabox awscli gtkextra msitools skinny bash hebcal node stunnel bitrise heroku node-build sysdig cake homebank oniguruma telegraf calabash imagemagick open-scene-graph terraform citus ios-sim openssl@1.1 tmux cmake jemalloc osmosis tomcat conan jenkins passenger typesafe-activator consul jmxtrans ponyc vim consul-backinator jsdoc3 pre-commit voldemort corectl kapacitor pulledpork wartremover dpkg kotlin pyenv wdc emscripten kubernetes-cli qbs webkitgtk filebeat lbdb quantlib winetricks flow libcec quazip youtube-dl freetds libexosip quilt z3 fuseki liblastfm qxmpp fzf libosip rclone gdb libphonenumber rhash ==> Deleted Formulae bzr-explorer coin czmqpp libechonest libqglviewer ==> Installing dependencies for rbenv: autoconf, pkg-config, openssl, ruby-build ==> Installing rbenv dependency: autoconf ==> Downloading https://homebrew.bintray.com/bottles/autoconf-2.69.sierra.bottle.4.tar.gz ######################################################################## 100.0% ==> Pouring autoconf-2.69.sierra.bottle.4.tar.gz ==> Caveats Emacs Lisp files have been installed to: /usr/local/share/emacs/site-lisp/autoconf ==> Summary 🍺 /usr/local/Cellar/autoconf/2.69: 70 files, 3.0M ==> Installing rbenv dependency: pkg-config ==> Downloading https://homebrew.bintray.com/bottles/pkg-config-0.29.1_2.sierra.bottle.tar.gz ######################################################################## 100.0% ==> Pouring pkg-config-0.29.1_2.sierra.bottle.tar.gz 🍺 /usr/local/Cellar/pkg-config/0.29.1_2: 10 files, 627.4K ==> Installing rbenv dependency: openssl ==> Downloading https://homebrew.bintray.com/bottles/openssl-1.0.2j.sierra.bottle.tar.gz ######################################################################## 100.0% ==> Pouring openssl-1.0.2j.sierra.bottle.tar.gz ==> Using the sandbox ==> Caveats A CA file has been bootstrapped using certificates from the SystemRoots keychain. To add additional certificates (e.g. the certificates added in the System keychain), place .pem files in /usr/local/etc/openssl/certs and run /usr/local/opt/openssl/bin/c_rehash This formula is keg-only, which means it was not symlinked into /usr/local. Apple has deprecated use of OpenSSL in favor of its own TLS and crypto libraries Generally there are no consequences of this for you. If you build your own software and it requires this formula, you'll need to add to your build variables: LDFLAGS: -L/usr/local/opt/openssl/lib CPPFLAGS: -I/usr/local/opt/openssl/include PKG_CONFIG_PATH: /usr/local/opt/openssl/lib/pkgconfig ==> Summary 🍺 /usr/local/Cellar/openssl/1.0.2j: 1,695 files, 12M ==> Installing rbenv dependency: ruby-build ==> Downloading https://github.com/rbenv/ruby-build/archive/v20160913.tar.gz ==> Downloading from https://codeload.github.com/rbenv/ruby-build/tar.gz/v20160913 ######################################################################## 100.0% ==> ./install.sh 🍺 /usr/local/Cellar/ruby-build/20160913: 304 files, 165.1K, built in 10 seconds ==> Installing rbenv ==> Downloading https://homebrew.bintray.com/bottles/rbenv-1.0.0.sierra.bottle.tar.gz ######################################################################## 100.0% ==> Pouring rbenv-1.0.0.sierra.bottle.tar.gz ==> Caveats Rbenv stores data under ~/.rbenv by default. If you absolutely need to store everything under Homebrew's prefix, include this in your profile: export RBENV_ROOT=/usr/local/var/rbenv To enable shims and autocompletion, run this and follow the instructions: rbenv init ==> Summary 🍺 /usr/local/Cellar/rbenv/1.0.0: 36 files, 62K
色んな記事に、ruby-buildをインストールすること、と書かれていますが、すでにインストールされていて不要でした。
$ brew install ruby-build Updating Homebrew... Warning: ruby-build-20160913 already installed
Rubyのインストール先の変更
デフォルトだと ~/.rbenv にインストールされます。ユーザーのホームディレクトリ配下なので特に問題ないのですが（ローカルの共通環境が汚れない）、ここではHomebrewでパッケージを管理するという方針なので、警告（上のCaveats）に従って変更しておきます。
rbenv + ruby-build はどうやって動いているのか - takatoshiono's blog を参考にさせてもらいました。
$ rbenv root /Users/yamadatakaaki/.rbenv $ echo 'export RBENV_ROOT=/usr/local/var/rbenv' >> ~/.bashrc $ echo 'eval "$(rbenv init -)"' >> ~/.bashrc $ source .bashrc $ rbenv root /usr/local/var/rbenv
試しに、Ruby 2.3.1をインストールしてみる
$ rbenv --version # => バージョン確認 rbenv 1.0.0 $ rbenv install --list # => インストール可能なバージョン一覧の表示 （省略） $ rbenv install 2.3.1 # => rubyのインストール （省略） $ rbenv rehash # => rbenv の再読み込み $ rbenv versions # => インストールあれているすべてのRubyを表示 * system (set by /usr/local/var/rbenv/version) 2.3.1 $ rbenv global 2.3.1 # => defaultで使うrubyのバージョン $ ruby --version ruby 2.3.1p112 (2016-04-26 revision 54768) [x86_64-darwin16]
