ansible-playbook for installing Ruby via rbenv on Debian7 system. This playbook was first published by @mmoya on http://mmoya.org/blog/2013/02/22/installing-rubyrbenv-with-ansible/

files_gemrc

---
:sources:
- http://gems.rubyforge.org
- http://gems.github.com
gem: --no-ri --no-rdoc

main.yml

---
- hosts: apps-ruby-test
  sudo: yes
  vars:
    - rbenv_root: /usr/local/rbenv
    - ruby_version: 2.0.0-p353

  tasks:
    - name: rbenv | install build depends
      apt: pkg={{ item }} state=latest install_recommends=no
      with_items:
        - build-essential
        - git
        - libcurl4-openssl-dev
        - libmysqlclient-dev
        - libsqlite3-dev
        - libpq-dev
        - libreadline6-dev
        - libssl-dev
        - libxml2-dev
        - libxslt1-dev
        - zlib1g-dev
        - libc6-dev
        - libyaml-dev

    - name: rbenv | update rbenv repo
      git: repo=git://github.com/sstephenson/rbenv.git dest={{ rbenv_root }} version=v0.4.0

    - name: rbenv | add rbenv to path
      file: path=/usr/local/bin/rbenv src={{ rbenv_root }}/bin/rbenv state=link

    - name: rbenv | add rbenv initialization to profile
      template: src=templates/rbenv.sh.j2 dest=/etc/profile.d/rbenv.sh owner=root group=root mode=0755

    - name: rbenv | check ruby-build installed
      command: test -x /usr/local/bin/ruby-build
      register: rbuild_present
      ignore_errors: yes

    - name: rbenv | create temporary directory
      command: mktemp -d
      register: tempdir
      when: rbuild_present|failed

    - name: rbenv | clone ruby-build repo
      git: repo=git://github.com/sstephenson/ruby-build.git dest={{tempdir.stdout}}/ruby-build
      when: rbuild_present|failed

    - name: rbenv | install ruby-build
      command: ./install.sh chdir={{tempdir.stdout}}/ruby-build
      when: rbuild_present|failed

    - name: rbenv | remove temporary directory
      file: path={{tempdir.stdout}} state=absent
      when: rbuild_present|failed

    - name: rbenv | check ruby ruby_version installed
      shell: RBENV_ROOT={{rbenv_root}} rbenv versions | grep {{ruby_version}}
      register: ruby_installed
      ignore_errors: yes

    - name: rbenv | install ruby ruby_version
      shell: RBENV_ROOT={{rbenv_root}} rbenv install {{ruby_version}}
      when: ruby_installed|failed

    - name: rbenv | set global ruby {{ruby_version}}
      shell: RBENV_ROOT={{rbenv_root}} rbenv global {{ruby_version}}
      when: ruby_installed|failed

    - name: rbenv | rehash
      shell: RBENV_ROOT={{rbenv_root}} rbenv rehash
      when: ruby_installed|failed

    - name: rbenv | set gemrc
      copy: src=files/gemrc dest=/root/.gemrc owner=root group=root mode=0644

templates_rbenv.sh.j2

export RBENV_ROOT="{{ rbenv_root }}"
eval "$(rbenv init -)"