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roles/rbenv/files/rbenv_installer.sh

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+#!/bin/bash
+set -e
+
+homebrew=
+type -p brew >/dev/null && homebrew=1
+
+try_bash_extension() {
+  if [ -x src/configure ]; then
+    src/configure && make -C src || {
+      echo "Optional bash extension failed to build, but things will still work normally."
+    }
+  fi
+}
+
+if ! type -p git >/dev/null; then
+  git() {
+    echo "Error: git is required to proceed. Please install git and try again." >&2
+    exit 1
+  }
+fi
+
+http() {
+  local url="$1"
+  if type -p curl >/dev/null; then
+    curl -fsSL "$url"
+  elif type -p wget >/dev/null; then
+    wget -q "$url" -O-
+  else
+    echo "Error: couldn't download file. No \`curl' or \`wget' found." >&2
+    return 1
+  fi
+}
+
+rbenv="$(command -v rbenv ~/.rbenv/bin/rbenv | head -1)"
+
+if [ -n "$rbenv" ]; then
+  echo "rbenv already seems installed in \`$rbenv'."
+  cd "${rbenv%/*}"
+
+  if [ -x ./brew ]; then
+    echo "Trying to update with Homebrew..."
+    brew update >/dev/null
+    if [ "$(./rbenv --version)" < "1.0.0" ] && brew list rbenv | grep -q rbenv/HEAD; then
+      brew uninstall rbenv
+      brew install rbenv --without-ruby-build
+    else
+      brew upgrade rbenv
+    fi
+  elif git remote -v 2>/dev/null | grep -q rbenv; then
+    echo "Trying to update with git..."
+    git pull --tags origin master
+    cd ..
+    try_bash_extension
+  fi
+else
+  if [ -n "$homebrew" ]; then
+    echo "Installing rbenv with Homebrew..."
+    brew update
+    brew install rbenv --without-ruby-build
+    rbenv="$(brew --prefix)/bin/rbenv"
+  else
+    echo "Installing rbenv with git..."
+    mkdir -p ~/.rbenv
+    cd ~/.rbenv
+    git init
+    git remote add -f -t master origin https://github.com/rbenv/rbenv.git
+    git checkout -b master origin/master
+    try_bash_extension
+    rbenv=~/.rbenv/bin/rbenv
+
+    if [ ! -e versions ] && [ -w /opt/rubies ]; then
+      ln -s /opt/rubies versions
+    fi
+  fi
+fi
+
+rbenv_root="$("$rbenv" root)"
+ruby_build="$(command -v "$rbenv_root"/plugins/*/bin/rbenv-install rbenv-install | head -1)"
+
+echo
+if [ -n "$ruby_build" ]; then
+  echo "\`rbenv install' command already available in \`$ruby_build'."
+  cd "${ruby_build%/*}"
+
+  if [ -x ./brew ]; then
+    echo "Trying to update with Homebrew..."
+    brew update >/dev/null
+    brew upgrade ruby-build
+  elif git remote -v 2>/dev/null | grep -q ruby-build; then
+    echo "Trying to update with git..."
+    git pull origin master
+  fi
+else
+  if [ -n "$homebrew" ]; then
+    echo "Installing ruby-build with Homebrew..."
+    brew update
+    brew install ruby-build
+  else
+    echo "Installing ruby-build with git..."
+    mkdir -p "${rbenv_root}/plugins"
+    git clone https://github.com/rbenv/ruby-build.git "${rbenv_root}/plugins/ruby-build"
+  fi
+fi
+
+# Enable caching of rbenv-install downloads
+mkdir -p "${rbenv_root}/cache"
+
+echo
+echo "Running doctor script to verify installation..."
+http https://github.com/rbenv/rbenv-installer/raw/master/bin/rbenv-doctor | "$BASH"
+
+echo
+echo "All done!"
+echo "Note that this installer doesn't yet configure your shell startup files:"
+i=0
+if [ -x ~/.rbenv/bin ]; then
+  echo "$((++i)). You'll want to ensure that \`~/.rbenv/bin' is added to PATH."
+fi
+echo "$((++i)). Run \`rbenv init' to see instructions how to configure rbenv for your shell."
+echo "$((++i)). Launch a new terminal window to verify that the configuration is correct."
+echo