This action downloads a prebuilt ruby and adds it to the PATH.

It is very efficient and takes about 5 seconds to download, extract and add the given Ruby to the PATH. No extra packages need to be installed.

Compared to actions/setup-ruby, this actions supports many more versions and features.

This action currently supports these versions of MRI, JRuby and TruffleRuby:

ruby-debug is the same as ruby-head but with assertions enabled (-DRUBY_DEBUG=1).
On Windows, mingw and mswin are ruby-head builds using the MSYS2/MinGW and the MSVC toolchains respectively.

Ruby 2.2 resolves to 2.2.6 on Windows (last build from RubyInstaller) and 2.2.10 otherwise.
Ruby 2.3 on Windows only has builds for 2.3.0, 2.3.1 and 2.3.3 (same as RubyInstaller).

Note that Ruby ≤ 2.3 and the OpenSSL version it needs (1.0.2) are both end-of-life, which means Ruby ≤ 2.3 is unmaintained and considered insecure. On Windows, Ruby 2.4 uses OpenSSL 1.0.2, which is no longer maintained.

The action works for all GitHub-hosted runners, and self-hosted runners, under certain conditions

Rubinius is only available on ubuntu-18.04.

The prebuilt releases are generated by ruby-builder and on Windows by RubyInstaller2. mingw and mswin builds are generated by ruby-loco. ruby-head is generated by ruby-dev-builder, jruby-head is generated by jruby-dev-builder and truffleruby-head is generated by truffleruby-dev-builder. The full list of available Ruby versions can be seen in ruby-builder-versions.js for Ubuntu and macOS and in windows-versions.js for Windows.

name: My workflow
on: [push]
jobs:
  test:
    runs-on: ubuntu-latest
    steps:
    - uses: actions/checkout@v2
    - uses: ruby/setup-ruby@v1
      with:
        ruby-version: 2.6 # Not needed with a .ruby-version file
    - run: bundle install
    - run: bundle exec rake

This matrix tests all stable releases and head versions of MRI, JRuby and TruffleRuby on Ubuntu and macOS.

name: My workflow
on: [push]
jobs:
  test:
    strategy:
      fail-fast: false
      matrix:
        os: [ubuntu, macos]
        ruby: [2.5, 2.6, 2.7, head, debug, jruby, jruby-head, truffleruby, truffleruby-head]
    runs-on: ${{ matrix.os }}-latest
    continue-on-error: ${{ endsWith(matrix.ruby, 'head') || matrix.ruby == 'debug' }}
    steps:
    - uses: actions/checkout@v2
    - uses: ruby/setup-ruby@v1
      with:
        ruby-version: ${{ matrix.ruby }}
    - run: bundle install
    - run: bundle exec rake

See the GitHub Actions documentation for more details about the workflow syntax and the condition and expression syntax.

• engine-version like ruby-2.6.5 and truffleruby-19.3.0
• short version like 2.6, automatically using the latest release matching that version (2.6.5)
• version only like 2.6.5, assumes MRI for the engine
• engine only like truffleruby, uses the latest stable release of that implementation
• .ruby-version reads from the project's .ruby-version file
• .tool-versions reads from the project's .tool-versions file
• If the ruby-version input is not specified, .ruby-version is tried first, followed by .tool-versions

By default, if there is a Gemfile.lock file with a BUNDLED WITH section, the latest version of Bundler with the same major version will be installed. Otherwise, the latest Bundler version is installed (except for Ruby 2.2 and 2.3 where only Bundler 1 is supported).

This behavior can be customized, see action.yml for details about the bundler input.

This action provides a way to automatically run bundle install and cache the result:

    - uses: ruby/setup-ruby@v1
      with:
        bundler-cache: true

This caching speeds up installing gems significantly and avoids too many requests to RubyGems.org.
It needs a Gemfile under the working-directory.
The caching works whether there is a Gemfile.lock or not. If there is a Gemfile.lock, bundle config --local deployment true is used.

To perform caching, this action will use bundle config --local path vendor/bundle.
Therefore, the Bundler path should not be changed in your workflow for the cache to work.

You can also cache gems manually, but this is not recommended because it is verbose and very difficult to use a correct cache key. You can cache the installed gems with these two steps:

    - uses: actions/cache@v2
      with:
        path: vendor/bundle
        key: bundle-use-ruby-${{ matrix.os }}-${{ matrix.ruby }}-${{ hashFiles('**/Gemfile.lock') }}
        restore-keys: |
          bundle-use-ruby-${{ matrix.os }}-${{ matrix.ruby }}-
    - name: bundle install
      run: |
        bundle config deployment true
        bundle config path vendor/bundle
        bundle install --jobs 4

When using a single OS, replace ${{ matrix.os }} with the OS.
When using a single job with a Ruby version, replace ${{ matrix.ruby }} with the Ruby version.
When using .ruby-version, replace ${{ matrix.ruby }} with ${{ hashFiles('.ruby-version') }}.
When using .tool-versions, replace ${{ matrix.ruby }} with ${{ hashFiles('.tool-versions') }}.

This uses the cache action. The code above is a more complete version of the [Ruby - Bundler example](https://github.com/actions/cache/blob/master/examples.md#ruby---\ bundler). Make sure to include use-ruby in the key to avoid conflicting with previous caches.

The working-directory input can be set to resolve .ruby-version, .tool-versions and Gemfile.lock if they are not at the root of the repository, see action.yml for details.

Note that running CI on Windows can be quite challenging if you are not very familiar with Windows. It is recommended to first get your build working on Ubuntu and macOS before trying Windows.

• The default shell on Windows is not Bash but PowerShell. This can lead issues such as multi-line scripts not working as expected.
• The PATH contains multiple compiler toolchains. Use where.exe to debug which tool is used.
• For Ruby ≥ 2.4, MSYS2 is prepended to the Path, similar to what RubyInstaller2 does.
• For Ruby < 2.4, the DevKit MSYS tools are installed and prepended to the Path.
• JRuby on Windows has a known bug that bundle exec rake fails.

It is highly recommended to use ruby/setup-ruby@v1 for the version of this action. This will provide the best experience by automatically getting bug fixes, new Ruby versions and new features.

If you instead choose a specific version (v1.2.3) or a commit sha, there will be no automatic bug fixes and it will be your responsibility to update every time the action no longer works. Make sure to always use the latest release before reporting an issue on GitHub.

This action follows semantic versioning with a moving v1 branch. This follows the recommendations of GitHub Actions.

You must meet the following parameters to use this action with self-hosted runners:

• Make sure that the operating system has libyaml-0 installed
• The runner software is running as user runner with a home directory of /home/runner, or you have created a symlink for the home directory of whatever user that the runner is running as to /home/runner.

This action used to be at eregon/use-ruby-action and was moved to the ruby organization. Please update if you are using eregon/use-ruby-action.

The current maintainer of this action is @eregon. Most of the Windows logic is based on work by MSP-Greg. Many thanks to MSP-Greg and Lars Kanis for the help with Ruby Installer.