Remove workaround for old truffleruby version from 2021

Updated examples to use checkout v5

.eslintrc.json

@@ -1,17 +0,0 @@
-{
-    "env": {
-        "commonjs": true,
-        "es6": true,
-        "node": true
-    },
-    "extends": "eslint:recommended",
-    "globals": {
-        "Atomics": "readonly",
-        "SharedArrayBuffer": "readonly"
-    },
-    "parserOptions": {
-        "ecmaVersion": 2018
-    },
-    "rules": {
-    }
-}

.github/FUNDING.yml

@@ -0,0 +1 @@
+github: [eregon]

.github/ISSUE_TEMPLATE/bug_report.yml

@@ -0,0 +1,43 @@
+name: Bug report
+description: Create a report to help us improve
+body:
+- type: markdown
+  attributes:
+    value: |
+      First, take some time to think whether this is really an issue of ruby/setup-ruby and whether it is fixable in this action.
+      This action basically just downloads a prebuilt Ruby and adds it to `PATH`, so it is unlikely the bug is in this action.
+      Give some thoughts whether it could be an issue in your workflow, in the gems you use, in GitHub Actions, in Ruby, RubyGems, Bundler, etc.
+      This is NOT the place to ask help about your workflow failing (ask that on [GitHub Community](https://github.com/orgs/community/discussions/categories/actions) or [Discussions](https://github.com/ruby/setup-ruby/discussions) instead), it is only to report issues about ruby/setup-ruby.
+      Please note we will close your issue without comment if you do not fill out the requested information.
+- type: checkboxes
+  attributes:
+    label: Ensure the following before filing this issue
+    options:
+    - label: |
+        I verified it reproduces with the latest version with `- uses: ruby/setup-ruby@v1` (see [Versioning policy](https://github.com/ruby/setup-ruby/blob/master/README.md#versioning))
+      required: true
+    - label: |
+        I tried to reproduce the issue locally by following the workflow steps (including all commands done by `ruby/setup-ruby`, except for `Downloading Ruby` & `Extracting Ruby`),
+        and it did not reproduce locally (if it does reproduce locally, it's not a ruby/setup-ruby issue)
+      required: true
+    # - label: |
+    #     If the issue happens on JRuby or TruffleRuby, and does not happen on CRuby (please check), file an issue there instead. It's very unlikely ruby/setup-ruby is the cause.
+    #   required: true
+- type: dropdown
+  attributes:
+    label: Are you running on a GitHub-hosted runner or a self-hosted runner?
+    options:
+      - GitHub-hosted runner
+      - self-hosted runner
+  validations:
+    required: true
+- type: input
+  attributes:
+    label: Link to the failed workflow job (must be a public workflow job, so the necessary information is available)
+  validations:
+    required: true
+- type: textarea
+  attributes:
+    label: Any other notes?
+  validations:
+    required: false

.github/ISSUE_TEMPLATE/config.yml

@@ -0,0 +1 @@
+blank_issues_enabled: false

.github/ISSUE_TEMPLATE/other-issue--not-a-bug-.md

@@ -0,0 +1,10 @@
+---
+name: Other issue (not a bug)
+about: Feature requests, etc
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+

.github/dependabot.yml

@@ -0,0 +1,6 @@
+version: 2
+updates:
+  - package-ecosystem: 'github-actions'
+    directory: '/'
+    schedule:
+      interval: 'weekly'

.github/workflows/release.yml

@@ -0,0 +1,24 @@
+name: Create a Release
+on:
+  workflow_dispatch:
+permissions:
+  contents: write # for creating release
+
+jobs:
+  release:
+    runs-on: ubuntu-latest
+    env:
+      GH_TOKEN: ${{ github.token }}
+      GH_REPO: ${{ github.repository }}
+    steps:
+    - uses: actions/checkout@v5
+      with:
+        fetch-depth: 0
+    - uses: ./
+      with:
+        ruby-version: '3.3'
+    - run: ruby release.rb
+    # The same as the update-v1-branch.yml workflow.
+    # That workflow is not triggered by the release created above because of
+    # https://docs.github.com/en/actions/security-guides/automatic-token-authentication#using-the-github_token-in-a-workflow
+    - run: git push origin HEAD:v1

.github/workflows/test.yml

@@ -1,17 +1,426 @@
 name: Test this action
-on: [push]
+on:
+  pull_request:
+  push:
+    branches-ignore:
+    - v1
+    tags-ignore:
+    - '*'
+    paths-ignore:
+    - README.md
+  workflow_dispatch:
+permissions:
+  contents: read
+
 jobs:
   test:
     strategy:
       fail-fast: false
       matrix:
-        os: [ ubuntu-16.04, ubuntu-18.04, macos-latest ]
-        ruby: [ ruby-2.4, 2.5, ruby-2.6.5, 2.7.0, truffleruby, jruby ]
+        os: [ ubuntu-22.04, ubuntu-24.04, ubuntu-22.04-arm, ubuntu-24.04-arm, macos-13, macos-14, macos-15, windows-2022, windows-2025, windows-11-arm ]
+        ruby: [
+          '1.9', '2.0', '2.1', '2.2', '2.3', '2.4', '2.5', '2.6', '2.7', '3.0', '3.1', '3.2', '3.3', '3.4', ruby-head,
+          jruby, jruby-head,
+          truffleruby, truffleruby-head,
+          truffleruby+graalvm, truffleruby+graalvm-head
+        ]
+        include:
+        - { os: windows-2022, ruby: mingw }
+        - { os: windows-2022, ruby: mswin }
+        - { os: windows-2022, ruby: ucrt  }
+        - { os: windows-2025, ruby: mingw }
+        - { os: windows-2025, ruby: mswin }
+        - { os: windows-2025, ruby: ucrt  }
+        - { os: ubuntu-24.04, ruby: asan }
+        - { os: ubuntu-24.04, ruby: 3.4-asan }
+        exclude:
+        # https://github.com/ruby/setup-ruby/issues/496
+        - { os: ubuntu-22.04, ruby: '2.2' }
+        - { os: ubuntu-24.04, ruby: '1.9' }
+        - { os: ubuntu-24.04, ruby: '2.2' }
+        # These old Rubies fail to compile on macOS arm64
+        - { os: macos-14, ruby: '1.9' }
+        - { os: macos-14, ruby: '2.0' }
+        - { os: macos-14, ruby: '2.1' }
+        - { os: macos-14, ruby: '2.2' }
+        - { os: macos-14, ruby: '2.3' }
+        - { os: macos-14, ruby: '2.4' }
+        - { os: macos-14, ruby: '2.5' }
+        - { os: macos-15, ruby: '1.9' }
+        - { os: macos-15, ruby: '2.0' }
+        - { os: macos-15, ruby: '2.1' }
+        - { os: macos-15, ruby: '2.2' }
+        - { os: macos-15, ruby: '2.3' }
+        - { os: macos-15, ruby: '2.4' }
+        - { os: macos-15, ruby: '2.5' }
+        # These old Rubies fail to compile or segfault on Linux arm64
+        - { os: ubuntu-22.04-arm, ruby: '1.9' }
+        - { os: ubuntu-22.04-arm, ruby: '2.0' }
+        - { os: ubuntu-22.04-arm, ruby: '2.1' }
+        - { os: ubuntu-22.04-arm, ruby: '2.2' }
+        - { os: ubuntu-24.04-arm, ruby: '1.9' }
+        - { os: ubuntu-24.04-arm, ruby: '2.0' }
+        - { os: ubuntu-24.04-arm, ruby: '2.1' }
+        - { os: ubuntu-24.04-arm, ruby: '2.2' }
+        # RubyInstaller windows-arm64 builds only exist for Ruby 3.4+
+        - { os: windows-11-arm, ruby: '2.0' }
+        - { os: windows-11-arm, ruby: '2.1' }
+        - { os: windows-11-arm, ruby: '2.2' }
+        - { os: windows-11-arm, ruby: '2.3' }
+        - { os: windows-11-arm, ruby: '2.4' }
+        - { os: windows-11-arm, ruby: '2.5' }
+        - { os: windows-11-arm, ruby: '2.6' }
+        - { os: windows-11-arm, ruby: '2.7' }
+        - { os: windows-11-arm, ruby: '3.0' }
+        - { os: windows-11-arm, ruby: '3.1' }
+        - { os: windows-11-arm, ruby: '3.2' }
+        - { os: windows-11-arm, ruby: '3.3' }
+        # RubyInstaller has no 64-bit builds of 1.9 on Windows
+        - { os: windows-2022, ruby: '1.9' }
+        - { os: windows-2025, ruby: '1.9' }
+        - { os: windows-11-arm, ruby: '1.9' }
+        # TruffleRuby does not support Windows
+        - { os: windows-2022, ruby: truffleruby }
+        - { os: windows-2025, ruby: truffleruby }
+        - { os: windows-11-arm, ruby: truffleruby }
+        - { os: windows-2022, ruby: truffleruby-head }
+        - { os: windows-2025, ruby: truffleruby-head }
+        - { os: windows-11-arm, ruby: truffleruby-head }
+        - { os: windows-2022, ruby: truffleruby+graalvm }
+        - { os: windows-2025, ruby: truffleruby+graalvm }
+        - { os: windows-11-arm, ruby: truffleruby+graalvm }
+        - { os: windows-2022, ruby: truffleruby+graalvm-head }
+        - { os: windows-2025, ruby: truffleruby+graalvm-head }
+        - { os: windows-11-arm, ruby: truffleruby+graalvm-head }
+
+    name: ${{ matrix.os }} ${{ matrix.ruby }}
     runs-on: ${{ matrix.os }}
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v5
+
     - uses: ./
       with:
         ruby-version: ${{ matrix.ruby }}
+        bundler-cache: true
     - run: ruby -v
-    - run: ruby -ropen-uri -e 'puts open("https://rubygems.org/") { |f| f.read(2014) }'
+    - name: PATH
+      shell: pwsh
+      run: |
+        # Show PATH with Powershell
+        $f, $r = $env:PATH.split([IO.Path]::PathSeparator); $r
+
+    - name: build compiler
+      run: |
+        ruby -e "puts 'build compiler: ' + RbConfig::CONFIG.fetch('CC_VERSION_MESSAGE', 'unknown').lines.first"
+    - name: gcc and ridk version (mingw)
+      if: startsWith(matrix.os, 'windows')
+      run: |
+        $abi, $plat = $(ruby -e "STDOUT.write RbConfig::CONFIG['ruby_version'] + ' ' + RUBY_PLATFORM").split(' ')
+        if ($plat.Contains('mingw')) {
+          gcc --version
+          if ($abi -ge '2.4') {
+            ridk version
+          } else {
+            echo 'ridk is unavailable'
+          }
+        } elseif ($plat.Contains('mswin')) {
+          Get-ChildItem "$env:VCPKG_INSTALLATION_ROOT\installed\vcpkg\info"
+        }
+    - name: RbConfig::CONFIG
+      run: ruby -rrbconfig -rpp -e 'pp RbConfig::CONFIG'
+    - name: RbConfig::MAKEFILE_CONFIG
+      run: ruby -rrbconfig -rpp -e 'pp RbConfig::MAKEFILE_CONFIG'
+
+    - name: Subprocess test
+      run: ruby test_subprocess.rb
+    - name: OpenSSL compiled version
+      run: ruby -ropenssl -e 'puts OpenSSL::OPENSSL_VERSION'
+    - name: OpenSSL loaded version
+      run: ruby -ropenssl -e 'puts OpenSSL::OPENSSL_LIBRARY_VERSION'
+      if: matrix.ruby != '1.9'
+    - name: OpenSSL test
+      run: ruby -ropen-uri -e 'puts URI.send(:open, %{https://rubygems.org/}) { |f| f.read(1024) }'
+
+    - run: gem env
+    - name: C extension test
+      run: gem install json -v 2.2.0
+    - run: bundle --version
+    # This step is redundant with `bundler-cache: true` but is there to check a redundant `bundle install` still works
+    - run: bundle install
+    - run: bundle exec rake --version
+    - run: bundle exec rake
+
+    # Ensure the same bundle commands work in bash on Windows
+    - name: bundle install (bash)
+      run: bundle install
+      shell: bash
+      if: startsWith(matrix.os, 'windows')
+    - name: bundle exec rake --version (bash)
+      run: bundle exec rake --version
+      shell: bash
+      if: startsWith(matrix.os, 'windows')
+    - name: bundle exec rake (bash)
+      run: bundle exec rake
+      shell: bash
+      if: startsWith(matrix.os, 'windows')
+
+    - name: Test `gem github:` in a Gemfile
+      run: bundle install
+      env:
+        BUNDLE_GEMFILE: ${{ github.workspace }}/gemfiles/gem_from_github.gemfile
+
+    - name: which ruby
+      shell: bash
+      run: which -a ruby
+    - name: which bundle
+      shell: bash
+      run: which -a bundle
+      # https://github.com/ruby/setup-ruby/issues/658
+      if: "matrix.ruby != 'mingw' && matrix.ruby != 'mswin' && matrix.ruby != 'ucrt'"
+    - name: which rake
+      run: which -a rake
+      if: "!startsWith(matrix.os, 'windows')"
+    - name: where ruby, rake, bundle
+      if: startsWith(matrix.os, 'windows')
+      run: |
+        $ErrorActionPreference = 'Continue'
+        $where = 'ruby', 'rake', 'bundle'
+        foreach ($e in $where) {
+          $rslt = where.exe $e 2>&1 | Out-String
+          if ($rslt.contains($e)) { echo $rslt.Trim() }
+          else { echo "Can't find $e" }
+          echo ''
+        }
+    - name: bash test
+      shell: bash
+      run: echo ~ && bundle install
+    - name: Windows JRuby
+      # Should be startsWith(matrix.ruby, 'jruby') but broken on jruby-head: https://github.com/jruby/jruby/issues/8623
+      if: startsWith(matrix.os, 'windows') && matrix.ruby == 'jruby'
+      run: gem install sassc
+
+  testDotRubyVersion:
+    name: "Test .ruby-version"
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v5
+      - run: echo "ruby-3.4.0" > .ruby-version
+      - uses: ./
+      - run: ruby -v | grep -F "ruby 3.4.0"
+
+  testToolVersions:
+    name: "Test .tool-versions"
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v5
+      - run: echo -e "nodejs 16.0.0\nruby   3.4.0" > .tool-versions
+      - uses: ./
+      - run: ruby -v | grep -F "ruby 3.4.0"
+
+  testMise:
+    name: "Test mise.toml"
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v5
+      - run: echo -e "[tools]\nnode = '18'\nruby = '3.4.0'" > mise.toml
+      - uses: ./
+      - run: ruby -v | grep -F "ruby 3.4.0"
+
+  testNoGemfile:
+    name: "Test with no Gemfile"
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v5
+      - run: rm Gemfile
+      - uses: ./
+        with:
+          ruby-version: '2.6'
+      - run: ruby -v
+
+  testNoGemfileWithBundlerCache:
+    name: "Test with no Gemfile but with bundler-cache"
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v5
+      - run: rm Gemfile
+      - uses: ./
+        with:
+          ruby-version: '2.6'
+          bundler-cache: true
+      - run: ruby -v
+
+  testLatestRubygemsVersion:
+    name: "Test rubygems: latest on ${{ matrix.ruby }}"
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        include:
+        - { ruby: '3.2', expected_rubygems_version: '3.6.1'  }
+        - { ruby: '3.0', expected_rubygems_version: '3.5.23' }
+        - { ruby: '2.7', expected_rubygems_version: '3.4.22' }
+        - { ruby: '2.6', expected_rubygems_version: '3.4.22' }
+        - { ruby: '2.5', expected_rubygems_version: '3.3.27' }
+        - { ruby: '2.3', expected_rubygems_version: '3.3.27' }
+        - { ruby: '2.0', expected_rubygems_version: '2.7.11' }
+    steps:
+    - uses: actions/checkout@v5
+    - uses: ./
+      with:
+        ruby-version: ${{ matrix.ruby }}
+        rubygems: latest
+    - run: ruby -e 'puts Gem::VERSION; exit(Gem.rubygems_version >= Gem::Version.new("${{ matrix.expected_rubygems_version }}"))'
+
+  testFixedRubygemsVersionUpgrades:
+    name: "Test rubygems: version upgrades RubyGems to that version if the default is older"
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v5
+    - uses: ./
+      with:
+        ruby-version: '2.6'
+        rubygems: 3.2.3
+    - run: gem --version | grep -F "3.2.3"
+
+  testFixedRubygemsVersionNoop:
+    name: "Test rubygems: version noops if the default is newer"
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v5
+    - uses: ./
+      with:
+        ruby-version: '3.1.0'
+        rubygems: 3.2.3
+    - run: gem --version | grep -F "3.3.3"
+
+  testUseBundlerFromRubyGemsUpdate:
+    name: "Test rubygems: version uses the Bundler installed by the rubygems update"
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v5
+      - uses: ./
+        with:
+          ruby-version: '3.1.0'
+          rubygems: 3.4.0
+      - run: gem --version | grep -F "3.4.0"
+      - run: bundle --version | grep -F "2.4.0"
+
+  testFixedBundlerVersionForOldRuby:
+    name: "Test bundler: 1.x for old Ruby"
+    runs-on: ubuntu-22.04
+    steps:
+      - uses: actions/checkout@v5
+      - uses: ./
+        with:
+          ruby-version: '2.3'
+          bundler: 1.16.6
+      - run: bundle --version | grep -F "1.16.6" # And not 1.17.x from ~> 1
+
+  testMajorBundlerVersion:
+    name: "Test with a major Bundler version"
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v5
+    - uses: ./
+      with:
+        ruby-version: '2.6'
+        bundler: 2
+    - run: bundle --version | grep -P "Bundler version 2\.\d+\.\d+"
+
+  testMinorBundlerVersion:
+    name: "Test with a minor Bundler version"
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v5
+    - uses: ./
+      with:
+        ruby-version: '2.6'
+        bundler: 2.2
+    - run: bundle --version | grep -P "Bundler version 2\.2\.\d+"
+
+  testExactBundlerVersion:
+    name: "Test with an exact Bundler version"
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v5
+    - uses: ./
+      with:
+        ruby-version: '2.6'
+        bundler: 2.2.3
+    - run: bundle --version | grep -F "Bundler version 2.2.3"
+
+  testBundlerPre:
+    name: "Test with a Bundler pre/rc version"
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v5
+      - uses: ./
+        with:
+          ruby-version: '2.6'
+          bundler: 2.2.0.rc.2
+      - run: bundle --version | grep -F "Bundler version 2.2.0.rc.2"
+
+  testBundlerDev:
+    name: "Test BUNDLED WITH Bundler dev"
+    runs-on: ubuntu-latest
+    env:
+      BUNDLE_GEMFILE: ${{ github.workspace }}/gemfiles/bundler-dev.gemfile
+    steps:
+      - uses: actions/checkout@v5
+      - uses: ./
+        with:
+          ruby-version: ruby-head
+          bundler-cache: true
+
+  testDependencyOnBundler1:
+    name: "Test gemfile depending on Bundler 1"
+    runs-on: ubuntu-latest
+    env:
+      BUNDLE_GEMFILE: ${{ github.workspace }}/gemfiles/bundler1.gemfile
+    steps:
+      - uses: actions/checkout@v5
+      - uses: ./
+        with:
+          ruby-version: '2.7'
+          bundler: 1
+          bundler-cache: true
+      - run: bundle --version | grep -F "Bundler version 1."
+
+  testGemfileMatrix:
+    strategy:
+      fail-fast: false
+      matrix:
+        gemfile: [ rails7, rails8 ]
+    name: "Test with ${{ matrix.gemfile }} gemfile"
+    runs-on: ubuntu-latest
+    env:
+      BUNDLE_GEMFILE: ${{ github.workspace }}/gemfiles/${{ matrix.gemfile }}.gemfile
+    steps:
+      - uses: actions/checkout@v5
+      - uses: ./
+        with:
+          ruby-version: '3.2'
+          bundler-cache: true
+      - run: bundle exec rails --version
+
+  testWindowsToolchain:
+    name: "Test windows-toolchain: none"
+    runs-on: windows-latest
+    steps:
+      - uses: actions/checkout@v5
+      - uses: ./
+        with:
+          ruby-version: '2.7'
+          windows-toolchain: none
+          bundler: none
+      - name: C:/msys64/mingw64/bin/gcc.exe not installed
+        run: ruby -e "abort if File.exist?('C:/msys64/mingw64/bin/gcc.exe')"
+
+  lint:
+    runs-on: ubuntu-22.04
+    steps:
+    - uses: actions/checkout@v5
+    - run: yarn install
+    - run: yarn run package
+    - name: Check generated files are up to date
+      run: git diff --exit-code

.github/workflows/update-v1-branch.yml

@@ -0,0 +1,15 @@
+name: Update the v1 branch when a release is published manually
+on:
+  release:
+    types: [published]
+permissions:
+  contents: write # for git push
+
+jobs:
+  update_branch:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v5
+      with:
+        fetch-depth: 0
+    - run: git push origin HEAD:v1

CONTRIBUTING.md

@@ -0,0 +1,30 @@
+# Contributing
+
+## Installing dependencies
+
+```bash
+$ yarn install
+```
+
+`npm` doesn't install the correct dependencies for `eslint` so we use `yarn`.
+
+## Regenerating dist/index.js
+
+```bash
+$ yarn run package
+```
+
+It is recommended to add this as a `git` `pre-commit` hook:
+
+```bash
+$ cp pre-commit .git/hooks/pre-commit
+```
+
+## Adding a new Ruby version
+
+This is entirely automated now since [this issue](https://github.com/ruby/setup-ruby/issues/254).
+If you do not see a new version more than 24 hours after it was released feel free to file an issue.
+
+## Release
+
+Maintainers can create a release automatically by running [this workflow](https://github.com/ruby/setup-ruby/actions/workflows/release.yml).

Gemfile

@@ -0,0 +1,6 @@
+# Used for testing
+source 'https://rubygems.org'
+
+gem "rake"
+gem "path"
+gem "json", "2.2.0"

README.md

@@ -1,16 +1,69 @@
-# use-ruby
+# setup-ruby
 
-This action downloads a prebuilt ruby and adds it to `$PATH`.
+This action downloads a prebuilt ruby and adds it to the `PATH`.
 
-It currently supports the latest stable versions of MRI, JRuby and TruffleRuby.
+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.
 
-See https://github.com/eregon/ruby-install-builder/blob/metadata/versions.json
-for the available Ruby versions.
+**Important:** Prefer `ruby/setup-ruby@v1`.
+If you pin to a commit or release, only the Ruby versions available at the time of the commit
+will be available, and you will need to update it to use newer Ruby versions, see [Versioning](#versioning).
 
-The action works for the `ubuntu-16.04`, `ubuntu-18.04` and `macos-latest` GitHub-hosted runners.  
-`windows-latest` is not yet supported.
+### Supported Versions
 
-The prebuilt rubies are generated by https://github.com/eregon/ruby-install-builder.
+This action currently supports these versions of MRI, JRuby and TruffleRuby:
+
+| Interpreter | Versions |
+| ----------- | -------- |
+| `ruby` | 1.9.3, 2.0.0, 2.1.9, 2.2, all versions from 2.3.0 until 3.5.0-preview1, head, debug, mingw, mswin, ucrt |
+| `jruby` | 9.1.17.0 - 10.0.2.0, head |
+| `truffleruby` | 19.3.0 - 24.2.1, head |
+| `truffleruby+graalvm` | 21.2.0 - 24.2.1, head |
+
+`ruby-debug` is the same as `ruby-head` but with assertions enabled (`-DRUBY_DEBUG=1`).
+
+`ruby-asan` is the same as `ruby-head` but with AddressSanitizer (ASan) enabled, helpful for finding memory issues in native extensions.
+Native extensions are automatically compiled with AddressSanitizer when using `ruby-asan`.
+`ruby-asan` is currently only available on `ubuntu-24.04`.
+
+`ruby-3.4-asan` is similar to `ruby-asan` but built from the latest stable 3.4 release tag.
+Like `ruby-asan`, it's currently only available on `ubuntu-24.04`.
+
+Regarding Windows ruby master builds, `mingw` is a MSYS2/MinGW build, `head` & `ucrt` are MSYS2/UCRT64
+builds, and `mswin` is a MSVC/VS 2022 build.
+
+Preview and RC versions of Ruby might be available too on Ubuntu and macOS (not on Windows).
+However, it is recommended to test against `ruby-head` rather than previews,
+as it provides more useful feedback for the Ruby core team and for upcoming changes.
+
+Only release versions published by [RubyInstaller](https://rubyinstaller.org/downloads/archives/)
+are available on Windows.  Due to that, Ruby 2.2 resolves to 2.2.6 on Windows and 2.2.10
+on other platforms. Ruby 2.3 on Windows only has builds for 2.3.0, 2.3.1 and 2.3.3.
+
+Note that Ruby ≤ 2.4 and the OpenSSL version it needs (1.0.2) are both end-of-life,
+which means Ruby ≤ 2.4 is unmaintained and considered insecure.
+
+### Supported Platforms
+
+The action works on these [GitHub-hosted runners](https://docs.github.com/en/actions/reference/runners/github-hosted-runners) images. Runner images not listed below are not supported yet. `$OS-latest` just alias to one of these images.
+
+| Operating System | Supported |
+| ---------------- | --------- |
+| Ubuntu  | `ubuntu-22.04`, `ubuntu-24.04`, `ubuntu-22.04-arm`, `ubuntu-24.04-arm` |
+| macOS   | `macos-13` and newer versions |
+| Windows | `windows-2022`, `windows-2025`, `windows-11-arm` |
+
+Not all combinations of runner images and versions are supported.
+The list of available Ruby versions can be seen in [ruby-builder-versions.json](ruby-builder-versions.json) for Ubuntu and macOS
+(although some combinations are not available, see [the full list](https://github.com/ruby/ruby-builder/releases/tag/toolcache))
+and in [windows-versions.json](windows-versions.json) for Windows.
+
+The prebuilt releases are generated by [ruby-builder](https://github.com/ruby/ruby-builder)
+and on Windows by [RubyInstaller2](https://github.com/oneclick/rubyinstaller2).
+The `mingw`, `ucrt` and `mswin` builds are generated by [ruby-loco](https://github.com/MSP-Greg/ruby-loco).
+`ruby-head` is generated by [ruby-dev-builder](https://github.com/ruby/ruby-dev-builder),
+`jruby-head` is generated by [jruby-dev-builder](https://github.com/ruby/jruby-dev-builder),
+`truffleruby-head` and `truffleruby+graalvm-head` are generated by [truffleruby-dev-builder](https://github.com/ruby/truffleruby-dev-builder).
 
 ## Usage
 
@@ -18,75 +71,219 @@ The prebuilt rubies are generated by https://github.com/eregon/ruby-install-buil
 
 ```yaml
 name: My workflow
-on: [push]
+on: [push, pull_request]
 jobs:
   test:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v2
-    - uses: eregon/use-ruby-action@master
+    - uses: actions/checkout@v5
+    - uses: ruby/setup-ruby@v1
       with:
-        ruby-version: ruby-2.6
-    - run: ruby -v
+        ruby-version: '3.4' # Not needed with a .ruby-version, .tool-versions or mise.toml
+        bundler-cache: true # runs 'bundle install' and caches installed gems automatically
+    - run: bundle exec rake
 ```
 
-### Matrix
+### Matrix of Ruby Versions
+
+This matrix tests all stable releases and `head` versions of MRI, JRuby and TruffleRuby on Ubuntu and macOS.
 
 ```yaml
 name: My workflow
-on: [push]
+on: [push, pull_request]
 jobs:
   test:
     strategy:
       fail-fast: false
       matrix:
-        os: [ ubuntu-latest, macos-latest ]
-        ruby: [ ruby-2.6, ruby-2.7, truffleruby-19.3.0, jruby-9.2.9.0 ]
+        os: [ubuntu-latest, macos-latest]
+        # Due to https://github.com/actions/runner/issues/849, we have to use quotes for '3.0'
+        ruby: ['2.7', '3.0', '3.1', '3.2', '3.3', '3.4', head, jruby, jruby-head, truffleruby, truffleruby-head]
     runs-on: ${{ matrix.os }}
     steps:
-    - uses: actions/checkout@v2
-    - uses: eregon/use-ruby-action@master
+    - uses: actions/checkout@v5
+    - uses: ruby/setup-ruby@v1
       with:
         ruby-version: ${{ matrix.ruby }}
-    - run: ruby -v
+        bundler-cache: true # runs 'bundle install' and caches installed gems automatically
+    - run: bundle exec rake
 ```
 
+### Matrix of Gemfiles
+
+```yaml
+name: My workflow
+on: [push, pull_request]
+jobs:
+  test:
+    strategy:
+      fail-fast: false
+      matrix:
+        gemfile: [ rails7, rails8 ]
+    runs-on: ubuntu-latest
+    env: # $BUNDLE_GEMFILE must be set at the job level, so it is set for all steps
+      BUNDLE_GEMFILE: ${{ github.workspace }}/gemfiles/${{ matrix.gemfile }}.gemfile
+    steps:
+      - uses: actions/checkout@v5
+      - uses: ruby/setup-ruby@v1
+        with:
+          ruby-version: '3.4'
+          bundler-cache: true # runs 'bundle install' and caches installed gems automatically
+      - run: bundle exec rake
+```
+
+See the GitHub Actions documentation for more details about the
+[workflow syntax](https://help.github.com/en/actions/reference/workflow-syntax-for-github-actions)
+and the [condition and expression syntax](https://help.github.com/en/actions/reference/context-and-expression-syntax-for-github-actions).
+
 ### Supported Version 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
+* short version like `'2.6'`, automatically using the latest release matching that version (`2.6.10`)
+* version only like `'2.6.5'`, assumes MRI for the engine
+* engine only like `ruby` and `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
+* `mise.toml` reads from the project's `mise.toml` file
+* If the `ruby-version` input is not specified, `.ruby-version` is tried first, followed by `.tool-versions`, followed by `mise.toml`
 
-### All Stable Versions
+### Working Directory
 
-With that, we can test on all stable releases of MRI, JRuby and TruffleRuby with:
+The `working-directory` input can be set to resolve `.ruby-version`, `.tool-versions`, `mise.toml` and `Gemfile.lock`
+if they are not at the root of the repository, see [action.yml](action.yml) for details.
 
+### RubyGems
+
+By default, the default RubyGems version that comes with each Ruby is used.
+However, users can optionally customize the RubyGems version that they want by
+setting the `rubygems` input.
+
+See [action.yml](action.yml) for more details about the `rubygems` input.
+
+If you're running into `ArgumentError: wrong number of arguments (given 4,
+expected 1)` errors with a stacktrace including Psych and RubyGems entries, you
+should be able to fix them by setting `rubygems: 3.0.0` or higher.
+
+### Bundler
+
+By default, Bundler is installed as follows:
+
+* If there is a `Gemfile.lock` file (or `$BUNDLE_GEMFILE.lock` or `gems.locked`) with a `BUNDLED WITH` section,
+  that version of Bundler will be installed and used.
+* If the Ruby ships with Bundler 2.2+ (as a default gem), that version is used.
+* Otherwise, the latest compatible Bundler version is installed (Bundler 2 on Ruby >= 2.3, Bundler 1 on Ruby < 2.3).
+
+This behavior can be customized, see [action.yml](action.yml) for more details about the `bundler` input.
+
+### Caching `bundle install` automatically
+
+This action provides a way to automatically run `bundle install` and cache the result:
 ```yaml
-name: My workflow
-on: [push]
-jobs:
-  test:
-    strategy:
-      fail-fast: false
-      matrix:
-        os: [ ubuntu-latest, macos-latest ]
-        ruby: [ 2.4, 2.5, 2.6, 2.7, truffleruby, jruby ]
-    runs-on: ${{ matrix.os }}
-    steps:
-    - uses: actions/checkout@v2
-    - uses: eregon/use-ruby-action@master
+    - uses: ruby/setup-ruby@v1
       with:
-        ruby-version: ${{ matrix.ruby }}
-    - run: ruby -v
+        bundler-cache: true
 ```
 
-## Efficiency
+Note that any step doing `bundle install` (for the root `Gemfile`) or `gem install bundler` can be removed with `bundler-cache: true`.
 
-It takes about 5 seconds to setup the given Ruby.
+This caching speeds up installing gems significantly and avoids too many requests to RubyGems.org.  
+It needs a `Gemfile` (or `$BUNDLE_GEMFILE` or `gems.rb`) under the [`working-directory`](#working-directory).  
+If there is a `Gemfile.lock` (or `$BUNDLE_GEMFILE.lock` or `gems.locked`), `bundle config --local deployment true` is used.
 
-## Limitations
+To use a `Gemfile` which is not at the root or has a different name, set `BUNDLE_GEMFILE` in the `env` at the job level
+as shown in the [example](#matrix-of-gemfiles).
 
-* Currently does not work on Windows since the builder doesn't build on Windows.
-  https://github.com/MSP-Greg/actions-ruby is an alternative on Windows.
-* This action currently only works with GitHub-hosted runners, not private runners.
+#### bundle config
+
+When using `bundler-cache: true` you might notice there is no good place to run `bundle config ...` commands.
+These can be replaced by `BUNDLE_*` environment variables, which are also faster.
+They should be set in the `env` at the job level as shown in the [example](#matrix-of-gemfiles).
+To find the correct the environment variable name, see the [Bundler docs](https://bundler.io/man/bundle-config.1.html) or look at `.bundle/config` after running `bundle config --local KEY VALUE` locally.
+You might need to `"`-quote the environment variable name in YAML if it has unusual characters like `/`.
+
+To perform caching, this action will use `bundle config --local path $PWD/vendor/bundle`.  
+Therefore, the Bundler `path` should not be changed in your workflow for the cache to work (no `bundle config path`).
+
+#### How it Works
+
+When there is no lockfile, one is generated with `bundle lock`, which is the same as `bundle install` would do first before actually fetching any gem.
+In other words, it works exactly like `bundle install`.
+The hash of the generated lockfile is then used for caching, which is the only correct approach.
+
+#### Dealing with a corrupted cache
+
+In some rare scenarios (like using gems with C extensions whose functionality depends on libraries found on the system
+at the time of the gem's build) it may be necessary to ignore contents of the cache and get and build all the gems anew.
+In order to achieve this, set the `cache-version` option to any value other than `0` (or change it to a new unique value
+if you have already used it before.)
+
+```yaml
+    - uses: ruby/setup-ruby@v1
+      with:
+        bundler-cache: true
+        cache-version: 1
+```
+
+#### Caching `bundle install` manually
+
+It is also possible to cache gems manually, but this is not recommended because it is verbose and *very difficult* to do correctly.
+There are many concerns which means using `actions/cache` is never enough for caching gems (e.g., incomplete cache key, cleaning old gems when restoring from another key, correctly hashing the lockfile if not checked in, OS versions, ABI compatibility for `ruby-head`, etc).
+So, please use `bundler-cache: true` instead and report any issue.
+
+## Windows
+
+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.
+
+* Use Bundler 2.2.18+ on Windows (older versions have [bugs](https://github.com/ruby/setup-ruby/issues/209#issuecomment-889064123)) by not setting the `bundler:` input and ensuring there is no `BUNDLED WITH 1.x.y` in a checked-in `Gemfile.lock`.
+* The default shell on Windows is not Bash but [PowerShell](https://help.github.com/en/actions/automating-your-workflow-with-github-actions/workflow-syntax-for-github-actions#using-a-specific-shell).
+  This can lead issues such as multi-line scripts [not working as expected](https://github.com/ruby/setup-ruby/issues/13).
+* The `PATH` contains [multiple compiler toolchains](https://github.com/ruby/setup-ruby/issues/19). 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`.
+* Use JRuby 9.2.20+ on Windows (older versions have [bugs](https://github.com/ruby/setup-ruby/issues/18#issuecomment-889072695)).
+* JRuby on Windows has multiple issues ([jruby/jruby#7106](https://github.com/jruby/jruby/issues/7106), [jruby/jruby#7182](https://github.com/jruby/jruby/issues/7182)).
+* When compiling extension code, note that the packages required to build Ruby are included when using Windows 2022. Additional packages can be installed with [setup-ruby-pkgs](https://github.com/ruby/setup-ruby-pkgs) or via MSYS2's `pacman`. These packages may be required when installing or updating Ruby stdlib extension gems.
+
+## Versioning
+
+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](https://github.com/actions/toolkit/blob/master/docs/action-versioning.md) of GitHub Actions.
+
+## Using self-hosted runners
+
+This action might work with [self-hosted runners](https://docs.github.com/en/actions/hosting-your-own-runners/about-self-hosted-runners)
+if the [Runner Image](https://github.com/actions/runner-images) is very similar to the ones used by GitHub runners. Notably:
+
+* Make sure to use the same operating system and version.
+* Make sure to use the same version of libssl.
+* Make sure that the operating system has `libyaml-0` and [`libgmp`](https://stackoverflow.com/questions/26555902/ruby-v-dyld-library-not-loaded-usr-local-lib-libgmp-10-dylib) installed
+* The default tool cache directory (`/opt/hostedtoolcache` on Linux, `/Users/runner/hostedtoolcache` on macOS,
+  `C:/hostedtoolcache/windows` on Windows) must be writable by the `runner` user.
+  This is necessary since the Ruby builds embed the install path when built and cannot be moved around.
+* `/home/runner` must be writable by the `runner` user.
+
+In other cases, you will need to install Ruby in the runner tool cache as shown by the action when it detects that case
+(run it so it will show you where to install Ruby).
+You could of course also not use this action and e.g. use Ruby from a system package or use a Docker image instead.
+
+See also the [`self-hosted:` input](action.yml).
+You can set it to `true` if you want to use custom-built Rubies in your self-hosted toolcache instead of prebuild Rubies.
+
+## History
+
+This action used to be at `eregon/use-ruby-action` and was moved to the `ruby` organization.
+Please [update](https://github.com/ruby/setup-ruby/releases/tag/v1.13.0) if you are using `eregon/use-ruby-action`.
+
+## Credits
+
+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.

Rakefile

@@ -0,0 +1,3 @@
+task :default do
+  puts "Hello World from Rake"
+end

action.yml

@@ -1,16 +1,53 @@
 name: 'Setup Ruby, JRuby and TruffleRuby'
-description: 'Download a prebuilt Ruby and add it to $PATH in 5 seconds'
+description: 'Download a prebuilt Ruby and add it to the PATH in 5 seconds'
 author: 'Benoit Daloze'
 branding:
   color: red
   icon: download
 inputs:
   ruby-version:
-    description: 'Engine and version to use in the format "myruby-X.Y.Z"'
-    required: true
+    description: 'Engine and version to use, see the syntax in the README. Reads from .ruby-version, .tool-versions or mise.toml if unset.'
+    default: 'default'
+  rubygems:
+    description: |
+      The version of RubyGems to use. Either 'default' (the default), 'latest', or a version number (e.g., 3.3.5).
+      For 'default', no action is taken and the version of RubyGems that comes with Ruby by default is used.
+      For 'latest', `gem update --system` is run to update to the latest compatible RubyGems version.
+      Ruby head/master builds will not be updated.
+      Similarly, if a version number is given, `gem update --system <version>` is run to update to that version of RubyGems, as long as that version is newer than the one provided by default.
+  bundler:
+    description: |
+      The version of Bundler to install. Either 'Gemfile.lock' (the default), 'default', 'latest', 'none', or a version number (e.g., 1, 2, 2.1, 2.1.4).
+      For 'Gemfile.lock', the version of the BUNDLED WITH section from the Gemfile.lock if it exists. If the file or section does not exist then the same as 'default'.
+      For 'default', if the Ruby ships with Bundler 2.2+ as a default gem, that version is used, otherwise the same as 'latest'.
+      For 'latest', the latest compatible Bundler version is installed (Bundler 2 on Ruby >= 2.3, Bundler 1 on Ruby < 2.3).
+      For 'none', nothing is done.
+  bundler-cache:
+    description: 'Run "bundle install", and cache the result automatically. Either true or false.'
+    default: 'false'
+  working-directory:
+    description: 'The working directory to use for resolving paths for .ruby-version, .tool-versions, mise.toml and Gemfile.lock.'
+  cache-version:
+    description: |
+      Arbitrary string that will be added to the cache key of the bundler cache. Set or change it if you need
+      to invalidate the cache.
+  self-hosted:
+    description: |
+      Consider the runner as a self-hosted runner, which means not using prebuilt Ruby binaries which only work
+      on GitHub-hosted runners or self-hosted runners with a very similar image to the ones used by GitHub runners.
+      The default is to detect this automatically based on the OS, OS version and architecture.
+  windows-toolchain:
+    description: |
+      This input allows to override the default toolchain setup on Windows.
+      The default setting ('default') installs a toolchain based on the selected Ruby.
+      Specifically, it installs MSYS2 if not already there and installs mingw/ucrt/mswin build tools and packages.
+      It also sets environment variables using 'ridk' or 'vcvars64.bat' based on the selected Ruby.
+      At present, the only other setting than 'default' is 'none', which only adds Ruby to PATH.
+      No build tools or packages are installed, nor are any ENV setting changed to activate them.
+
 outputs:
   ruby-prefix:
     description: 'The prefix of the installed ruby'
 runs:
-  using: 'node12'
+  using: 'node20'
   main: 'dist/index.js'

bundler.js

@@ -0,0 +1,249 @@
+const fs = require('fs')
+const path = require('path')
+const core = require('@actions/core')
+const exec = require('@actions/exec')
+const cache = require('@actions/cache')
+const common = require('./common')
+
+export const DEFAULT_CACHE_VERSION = '0'
+
+function isValidBundlerVersion(bundlerVersion) {
+  return /^\d+(?:\.\d+){0,2}/.test(bundlerVersion) && !bundlerVersion.endsWith('.dev')
+}
+
+// The returned gemfile is guaranteed to exist, the lockfile might not exist
+export function detectGemfiles() {
+  const gemfilePath = process.env['BUNDLE_GEMFILE'] || 'Gemfile'
+  if (fs.existsSync(gemfilePath)) {
+    return [gemfilePath, `${gemfilePath}.lock`]
+  } else if (process.env['BUNDLE_GEMFILE']) {
+    throw new Error(`$BUNDLE_GEMFILE is set to ${gemfilePath} but does not exist`)
+  }
+
+  if (fs.existsSync("gems.rb")) {
+    return ["gems.rb", "gems.locked"]
+  }
+
+  return [null, null]
+}
+
+function readBundledWithFromGemfileLock(lockFile) {
+  if (lockFile !== null && fs.existsSync(lockFile)) {
+    const contents = fs.readFileSync(lockFile, 'utf8')
+    const lines = contents.split(/\r?\n/)
+    const bundledWithLine = lines.findIndex(line => /^BUNDLED WITH$/.test(line.trim()))
+    if (bundledWithLine !== -1) {
+      const nextLine = lines[bundledWithLine+1]
+      if (nextLine) {
+        const bundlerVersion = nextLine.trim()
+        if (isValidBundlerVersion(bundlerVersion)) {
+          console.log(`Using Bundler ${bundlerVersion} from ${lockFile} BUNDLED WITH ${bundlerVersion}`)
+          return bundlerVersion
+        } else {
+          console.log(`Could not parse BUNDLED WITH version as a valid Bundler release, ignoring it: ${bundlerVersion}`)
+        }
+      }
+    }
+  }
+  return null
+}
+
+export async function installBundler(bundlerVersionInput, rubygemsInputSet, lockFile, platform, rubyPrefix, engine, rubyVersion) {
+  let bundlerVersion = bundlerVersionInput
+
+  if (rubygemsInputSet && (bundlerVersion === 'default' || bundlerVersion === 'Gemfile.lock')) {
+    console.log('Using the Bundler installed by updating RubyGems')
+    return 'unknown'
+  }
+
+  if (bundlerVersion === 'Gemfile.lock') {
+    let bundlerVersionFromGemfileLock = readBundledWithFromGemfileLock(lockFile)
+
+    if (bundlerVersionFromGemfileLock) {
+      bundlerVersion = bundlerVersionFromGemfileLock
+    } else {
+      bundlerVersion = 'default'
+    }
+  }
+
+  const floatVersion = common.floatVersion(rubyVersion)
+
+  if (bundlerVersion === 'default') {
+    if (common.isBundler2dot2Default(engine, rubyVersion)) {
+      if (common.windows && engine === 'ruby' && (common.isStableVersion(engine, rubyVersion) || rubyVersion === 'head')) {
+        // https://github.com/ruby/setup-ruby/issues/371
+        console.log(`Installing latest Bundler for ${engine}-${rubyVersion} on Windows because bin/bundle does not work in bash otherwise`)
+        bundlerVersion = 'latest'
+      } else {
+        console.log(`Using Bundler 2 shipped with ${engine}-${rubyVersion}`)
+        return '2'
+      }
+    } else if (common.hasBundlerDefaultGem(engine, rubyVersion)) {
+      // Those Rubies have a old Bundler default gem < 2.2 which does not work well for `gem 'foo', github: 'foo/foo'`:
+      // https://github.com/ruby/setup-ruby/issues/358#issuecomment-1195899304
+      // Also, Ruby 2.6 would get Bundler 1 yet Ruby 2.3 - 2.5 get latest Bundler 2 which might be unexpected.
+      console.log(`Using latest Bundler for ${engine}-${rubyVersion} because the default Bundler gem is too old for that Ruby version`)
+      bundlerVersion = 'latest'
+    } else {
+      bundlerVersion = 'latest'
+    }
+  }
+
+  if (bundlerVersion === 'latest') {
+    bundlerVersion = '2'
+  }
+
+  if (isValidBundlerVersion(bundlerVersion)) {
+    // OK - input is a 1, 2, or 3 part version number
+  } else {
+    throw new Error(`Cannot parse bundler input: ${bundlerVersion}`)
+  }
+
+  // Use Bundler 1 when we know Bundler 2 does not work
+  if (bundlerVersion.startsWith('2')) {
+    if (engine === 'ruby' && floatVersion <= 2.2) {
+      console.log('Bundler 2 requires Ruby 2.3+, using Bundler 1 on Ruby <= 2.2')
+      bundlerVersion = '1'
+    } else if (engine === 'ruby' && /^2\.3\.[01]/.test(rubyVersion)) {
+      console.log('Ruby 2.3.0 and 2.3.1 have shipped with an old rubygems that only works with Bundler 1')
+      bundlerVersion = '1'
+    } else if (engine === 'jruby' && rubyVersion.startsWith('9.1')) { // JRuby 9.1 targets Ruby 2.3, treat it the same
+      console.log('JRuby 9.1 has a bug with Bundler 2 (https://github.com/ruby/setup-ruby/issues/108), using Bundler 1 instead on JRuby 9.1')
+      bundlerVersion = '1'
+    }
+  }
+
+  const targetRubyVersion = common.targetRubyVersion(engine, rubyVersion)
+  // Use Bundler 2.3 when we use Ruby 2.3.2 - 2.5
+  // Use Bundler 2.4 when we use Ruby 2.6-2.7
+  if (bundlerVersion == '2') {
+    if (targetRubyVersion <= 2.5) { // < 2.3.2 already handled above
+      console.log('Ruby 2.3.2 - 2.5 only works with Bundler 2.3')
+      bundlerVersion = '2.3'
+    } else if (targetRubyVersion <= 2.7) {
+      console.log('Ruby 2.6-2.7 only works with Bundler 2.4')
+      bundlerVersion = '2.4'
+    }
+  }
+
+  const gem = path.join(rubyPrefix, 'bin', 'gem')
+
+  const versionParts = [...bundlerVersion.matchAll(/\d+/g)].length
+  const bundlerVersionConstraint = versionParts >= 3 ? bundlerVersion : `~> ${bundlerVersion}.0`
+
+  await exec.exec(gem, ['install', 'bundler', '-v', bundlerVersionConstraint])
+
+  return bundlerVersion
+}
+
+export async function bundleInstall(gemfile, lockFile, platform, engine, rubyVersion, bundlerVersion, cacheVersion) {
+  if (gemfile === null) {
+    console.log('Could not determine gemfile path, skipping "bundle install" and caching')
+    return false
+  }
+
+  let envOptions = {}
+  if (bundlerVersion.startsWith('1') && common.isBundler2Default(engine, rubyVersion)) {
+    // If Bundler 1 is specified on Rubies which ship with Bundler 2,
+    // we need to specify which Bundler version to use explicitly until the lockfile exists.
+    console.log(`Setting BUNDLER_VERSION=${bundlerVersion} for "bundle config|lock" commands below to ensure Bundler 1 is used`)
+    envOptions = { env: { ...process.env, BUNDLER_VERSION: bundlerVersion } }
+  }
+
+  // config
+  const cachePath = 'vendor/bundle'
+  // An absolute path, so it is reliably under $PWD/vendor/bundle, and not relative to the gemfile's directory
+  const bundleCachePath = path.join(process.cwd(), cachePath)
+
+  await exec.exec('bundle', ['config', '--local', 'path', bundleCachePath], envOptions)
+
+  if (fs.existsSync(lockFile)) {
+    await exec.exec('bundle', ['config', '--local', 'deployment', 'true'], envOptions)
+  } else {
+    // Generate the lockfile so we can use it to compute the cache key.
+    // This will also automatically pick up the latest gem versions compatible with the Gemfile.
+    await exec.exec('bundle', ['lock'], envOptions)
+  }
+
+  // cache key
+  const paths = [cachePath]
+  const baseKey = await computeBaseKey(engine, rubyVersion, lockFile, cacheVersion)
+  const key = `${baseKey}-${await common.hashFile(lockFile)}`
+  // If only Gemfile.lock changes we can reuse part of the cache, and clean old gem versions below
+  const restoreKeys = [`${baseKey}-`]
+  console.log(`Cache key: ${key}`)
+
+  // restore cache & install
+  let cachedKey = null
+  try {
+    // .slice() to workaround https://github.com/actions/toolkit/issues/1377
+    cachedKey = await cache.restoreCache(paths.slice(), key, restoreKeys)
+  } catch (error) {
+    if (error.name === cache.ValidationError.name) {
+      throw error;
+    } else {
+      core.info(`[warning] There was an error restoring the cache ${error.message}`)
+    }
+  }
+
+  if (cachedKey) {
+    console.log(`Found cache for key: ${cachedKey}`)
+  }
+
+  // Always run 'bundle install' to list the gems
+  await exec.exec('bundle', ['install', '--jobs', '4'])
+
+  // @actions/cache only allows to save for non-existing keys
+  if (!common.isExactCacheKeyMatch(key, cachedKey)) {
+    if (cachedKey) { // existing cache but Gemfile.lock differs, clean old gems
+      await exec.exec('bundle', ['clean'])
+    }
+
+    // Error handling from https://github.com/actions/cache/blob/master/src/save.ts
+    console.log('Saving cache')
+    try {
+      await cache.saveCache(paths, key)
+    } catch (error) {
+      if (error.name === cache.ValidationError.name) {
+        throw error;
+      } else if (error.name === cache.ReserveCacheError.name) {
+        core.info(error.message);
+      } else {
+        core.info(`[warning]${error.message}`)
+      }
+    }
+  }
+
+  return true
+}
+
+async function computeBaseKey(engine, version, lockFile, cacheVersion) {
+  const cwd = process.cwd()
+  const bundleWith = process.env['BUNDLE_WITH'] || ''
+  const bundleWithout = process.env['BUNDLE_WITHOUT'] || ''
+  const bundleOnly = process.env['BUNDLE_ONLY'] || ''
+  let key = `setup-ruby-bundler-cache-v6-${common.getOSNameVersionArch()}-${engine}-${version}-wd-${cwd}-with-${bundleWith}-without-${bundleWithout}-only-${bundleOnly}`
+
+  if (cacheVersion !== DEFAULT_CACHE_VERSION) {
+    key += `-v-${cacheVersion}`
+  }
+
+  if (common.isHeadVersion(version)) {
+    if (engine !== 'jruby') {
+      let print_abi = "print RbConfig::CONFIG['ruby_version']"
+      let abi = ''
+      await exec.exec('ruby', ['-e', print_abi], {
+        silent: true,
+        listeners: {
+          stdout: (data) => {
+            abi += data.toString();
+          }
+        }
+      });
+      key += `-ABI-${abi}`
+    }
+  }
+
+  key += `-${lockFile}`
+  return key
+}

common.js

@@ -0,0 +1,431 @@
+const os = require('os')
+const path = require('path')
+const fs = require('fs')
+const util = require('util')
+const stream = require('stream')
+const crypto = require('crypto')
+const core = require('@actions/core')
+const tc = require('@actions/tool-cache')
+const exec = require('@actions/exec')
+const { performance } = require('perf_hooks')
+const linuxOSInfo = require('linux-os-info')
+
+export const windows = (os.platform() === 'win32')
+// Extract to SSD on Windows, see https://github.com/ruby/setup-ruby/pull/14
+export const drive = (windows ? (process.env['RUNNER_TEMP'] || 'C')[0] : undefined)
+
+export const inputs = {
+  selfHosted: undefined
+}
+
+export function partition(string, separator) {
+  const i = string.indexOf(separator)
+  if (i === -1) {
+    throw new Error(`No separator ${separator} in string ${string}`)
+  }
+  return [string.slice(0, i), string.slice(i + separator.length, string.length)]
+}
+
+let inGroup = false
+
+export async function measure(name, block) {
+  const body = async () => {
+    const start = performance.now()
+    try {
+      return await block()
+    } finally {
+      const end = performance.now()
+      const duration = (end - start) / 1000.0
+      console.log(`Took ${duration.toFixed(2).padStart(6)} seconds`)
+    }
+  }
+
+  if (inGroup) {
+    // Nested groups are not yet supported on GitHub Actions
+    console.log(`> ${name}`)
+    return await body()
+  } else {
+    inGroup = true
+    try {
+      return await core.group(name, body)
+    } finally {
+      inGroup = false
+    }
+  }
+}
+
+// Same as mesaure() but without the group, and no time shown on error
+export async function time(name, block) {
+  console.log(`> ${name}`)
+  const start = performance.now()
+  const value = await block()
+  const end = performance.now()
+
+  const duration = (end - start) / 1000.0
+  console.log(`Took ${duration.toFixed(2).padStart(6)} seconds`)
+  return value
+}
+
+export function isHeadVersion(rubyVersion) {
+  // 3.4-asan counts as "head" because the version cannot be selected -- you can only get whatever's latest
+  return ['head', 'debug',  'mingw', 'mswin', 'ucrt', 'asan', '3.4-asan'].includes(rubyVersion)
+}
+
+export function isStableVersion(engine, rubyVersion) {
+  if (engine.startsWith('truffleruby')) {
+    return /^\d+(\.\d+)*(-preview\d+)?$/.test(rubyVersion)
+  } else {
+    return /^\d+(\.\d+)*$/.test(rubyVersion)
+  }
+}
+
+export function hasBundlerDefaultGem(engine, rubyVersion) {
+  return isBundler1Default(engine, rubyVersion) || isBundler2Default(engine, rubyVersion)
+}
+
+export function isBundler1Default(engine, rubyVersion) {
+  if (engine === 'ruby') {
+    return floatVersion(rubyVersion) >= 2.6 && floatVersion(rubyVersion) < 2.7
+  } else if (engine.startsWith('truffleruby')) {
+    return floatVersion(rubyVersion) < 21.0
+  } else if (engine === 'jruby') {
+    return false
+  } else {
+    return false
+  }
+}
+
+export function isBundler2Default(engine, rubyVersion) {
+  if (engine === 'ruby') {
+    return floatVersion(rubyVersion) >= 2.7
+  } else if (engine.startsWith('truffleruby')) {
+    return floatVersion(rubyVersion) >= 21.0
+  } else if (engine === 'jruby') {
+    return floatVersion(rubyVersion) >= 9.3
+  } else {
+    return false
+  }
+}
+
+export function isBundler2dot2Default(engine, rubyVersion) {
+  if (engine === 'ruby') {
+    return floatVersion(rubyVersion) >= 3.0
+  } else if (engine.startsWith('truffleruby')) {
+    return floatVersion(rubyVersion) >= 22.0
+  } else if (engine === 'jruby') {
+    return floatVersion(rubyVersion) >= 9.3
+  } else {
+    return false
+  }
+}
+
+export function targetRubyVersion(engine, rubyVersion) {
+  const version = floatVersion(rubyVersion)
+  if (engine === 'ruby') {
+    return version
+  } else if (engine === 'jruby') {
+    if (version === 9.1) {
+      return 2.3
+    } else if (version === 9.2) {
+      return 2.5
+    } else if (version === 9.3) {
+      return 2.6
+    } else if (version === 9.4) {
+      return 3.1
+    }
+  } else if (engine.startsWith('truffleruby')) {
+    if (version < 21.0) {
+      return 2.6
+    } else if (version < 22.0) {
+      return 2.7
+    } else if (version < 23.0) {
+      return 3.0
+    } else if (version < 23.1) {
+      return 3.1
+    } else if (version < 24.2) {
+      return 3.2
+    }
+  }
+
+  return 9.9 // unknown, assume recent
+}
+
+export function floatVersion(rubyVersion) {
+  const match = rubyVersion.match(/^\d+\.\d+/)
+  if (match) {
+    return parseFloat(match[0])
+  } else if (isHeadVersion(rubyVersion)) {
+    return 999.999
+  } else {
+    throw new Error(`Could not convert version ${rubyVersion} to a float`)
+  }
+}
+
+export async function hashFile(file) {
+  // See https://github.com/actions/runner/blob/master/src/Misc/expressionFunc/hashFiles/src/hashFiles.ts
+  const hash = crypto.createHash('sha256')
+  const pipeline = util.promisify(stream.pipeline)
+  await pipeline(fs.createReadStream(file), hash)
+  return hash.digest('hex')
+}
+
+// macos is not listed explicitly, see below
+const GitHubHostedPlatforms = [
+  'ubuntu-22.04-x64',
+  'ubuntu-22.04-arm64',
+  'ubuntu-24.04-x64',
+  'ubuntu-24.04-arm64',
+  'windows-2022-x64',
+  'windows-2025-x64',
+  'windows-11-arm64'
+]
+
+// Precisely: whether we have builds for that platform and there are GitHub-hosted runners to test it
+function isSupportedPlatform() {
+  const platform = getOSName()
+  switch (platform) {
+    case 'ubuntu':
+      return GitHubHostedPlatforms.includes(getOSNameVersionArch())
+    case 'macos':
+      // See https://github.com/ruby/ruby-builder/blob/master/README.md#naming
+      // 13 on arm64 because of old macos-arm-oss runners
+      return (os.arch() === 'x64' && parseInt(getOSVersion()) >= 13) ||
+          (os.arch() === 'arm64' && parseInt(getOSVersion()) >= 13)
+    case 'windows':
+      return GitHubHostedPlatforms.includes(getOSNameVersionArch())
+  }
+}
+
+// Actually a self-hosted runner for which the OS and OS version does not correspond to a GitHub-hosted runner image,
+export function isSelfHostedRunner() {
+  if (inputs.selfHosted === undefined) {
+    throw new Error('inputs.selfHosted should have been already set')
+  }
+
+  return inputs.selfHosted === 'true' || !isSupportedPlatform()
+}
+
+export function selfHostedRunnerReason() {
+  if (inputs.selfHosted === 'true') {
+    return 'the self-hosted input was set'
+  } else if (!isSupportedPlatform()) {
+    return 'the platform does not match a GitHub-hosted runner image (or that image is deprecated and no longer supported)'
+  } else {
+    return 'unknown reason'
+  }
+}
+
+let osName = undefined
+let osVersion = undefined
+
+export function getOSName() {
+  if (osName !== undefined) {
+    return osName
+  }
+
+  const platform = os.platform()
+  if (platform === 'linux') {
+    const info = linuxOSInfo({mode: 'sync'})
+    osName = info.id
+  } else if (platform === 'darwin') {
+    osName = 'macos'
+  } else if (platform === 'win32') {
+    osName = 'windows'
+  } else {
+    throw new Error(`Unknown platform ${platform}`)
+  }
+
+  return osName
+}
+
+export function getOSVersion() {
+  if (osVersion !== undefined) {
+    return osVersion
+  }
+
+  const platform = os.platform()
+  if (platform === 'linux') {
+    const info = linuxOSInfo({mode: 'sync'})
+    osVersion = info.version_id
+  } else if (platform === 'darwin') {
+    // See https://github.com/sindresorhus/macos-release/blob/main/index.js
+    const darwinVersion = parseInt(os.release().match(/^\d+/)[0])
+    osVersion = `${darwinVersion - 9}`
+  } else if (platform === 'win32') {
+    osVersion = findWindowsVersion()
+  } else {
+    throw new Error(`Unknown platform ${platform}`)
+  }
+
+  return osVersion
+}
+
+export function getOSNameVersion() {
+  return `${getOSName()}-${getOSVersion()}`
+}
+
+export function getOSNameVersionArch() {
+  return `${getOSName()}-${getOSVersion()}-${os.arch()}`
+}
+
+function findWindowsVersion() {
+  const version = os.version()
+  const match = version.match(/^Windows(?: Server)? (\d+) (?:Datacenter|Enterprise)/)
+  if (match) {
+    return match[1]
+  } else {
+    throw new Error('Could not find Windows version')
+  }
+}
+
+export function shouldUseToolCache(engine, version) {
+  return (engine === 'ruby' && !isHeadVersion(version)) || isSelfHostedRunner()
+}
+
+export function getToolCachePath() {
+  if (isSelfHostedRunner()) {
+    return getRunnerToolCache()
+  } else {
+    // Rubies prebuilt by this action embed this path rather than using $RUNNER_TOOL_CACHE
+    // so use that path if not isSelfHostedRunner()
+    return getDefaultToolCachePath()
+  }
+}
+
+export function getRunnerToolCache() {
+  const runnerToolCache = process.env['RUNNER_TOOL_CACHE']
+  if (!runnerToolCache) {
+    throw new Error('$RUNNER_TOOL_CACHE must be set')
+  }
+  return runnerToolCache
+}
+
+// Rubies prebuilt by this action embed this path rather than using $RUNNER_TOOL_CACHE
+function getDefaultToolCachePath() {
+  const platform = getOSName()
+  switch (platform) {
+    case 'ubuntu':
+      return '/opt/hostedtoolcache'
+    case 'macos':
+      return '/Users/runner/hostedtoolcache'
+    case 'windows':
+      return 'C:\\hostedtoolcache\\windows'
+  }
+}
+
+// tc.find() but using RUNNER_TOOL_CACHE=getToolCachePath()
+export function toolCacheFind(engine, version) {
+  const originalToolCache = getToolCachePath()
+  process.env['RUNNER_TOOL_CACHE'] = getToolCachePath()
+  try {
+    return tc.find(engineToToolCacheName(engine), version)
+  } finally {
+    process.env['RUNNER_TOOL_CACHE'] = originalToolCache
+  }
+}
+
+function engineToToolCacheName(engine) {
+  return {
+    ruby: 'Ruby',
+    jruby: 'JRuby',
+    truffleruby: 'TruffleRuby',
+    "truffleruby+graalvm": 'TruffleRubyGraalVM'
+  }[engine]
+}
+
+export function getToolCacheRubyPrefix(_platform, engine, version) {
+  const toolCache = getToolCachePath()
+  return path.join(toolCache, engineToToolCacheName(engine), version, os.arch())
+}
+
+export function toolCacheCompleteFile(toolCacheRubyPrefix) {
+  return `${toolCacheRubyPrefix}.complete`
+}
+
+export function createToolCacheCompleteFile(toolCacheRubyPrefix) {
+  fs.writeFileSync(toolCacheCompleteFile(toolCacheRubyPrefix), '')
+}
+
+// convert windows path like C:\Users\runneradmin to /c/Users/runneradmin
+export function win2nix(path) {
+  if (/^[A-Z]:/i.test(path)) {
+    // path starts with drive
+    path = `/${path[0].toLowerCase()}${partition(path, ':')[1]}`
+  }
+  return path.replace(/\\/g, '/').replace(/ /g, '\\ ')
+}
+
+export function setupPath(newPathEntries) {
+  const envPath = windows ? 'Path' : 'PATH'
+  const originalPath = process.env[envPath].split(path.delimiter)
+  let cleanPath = originalPath.filter(entry => !/\bruby\b/i.test(entry))
+
+  core.group(`Modifying ${envPath}`, async () => {
+    // First remove the conflicting path entries
+    if (cleanPath.length !== originalPath.length) {
+      console.log(`Entries removed from ${envPath} to avoid conflicts with default Ruby:`)
+      for (const entry of originalPath) {
+        if (!cleanPath.includes(entry)) {
+          console.log(`  ${entry}`)
+        }
+      }
+      core.exportVariable(envPath, cleanPath.join(path.delimiter))
+    }
+
+    console.log(`Entries added to ${envPath} to use selected Ruby:`)
+    for (const entry of newPathEntries) {
+      console.log(`  ${entry}`)
+    }
+  })
+
+  core.addPath(newPathEntries.join(path.delimiter))
+}
+
+export async function setupJavaHome(rubyPrefix) {
+  await measure("Modifying JAVA_HOME for JRuby", async () => {
+    console.log("attempting to run with existing JAVA_HOME")
+
+    const javaHome = process.env['JAVA_HOME']
+    let java = javaHome ? path.join(javaHome, 'bin/java') : 'java'
+    let ret = await exec.exec(java, ['-jar', path.join(rubyPrefix, 'lib/jruby.jar'), '--version'], {ignoreReturnCode: true})
+
+    if (ret === 0) {
+      console.log("JRuby successfully starts, using existing JAVA_HOME")
+    } else {
+      console.log("JRuby failed to start, try Java 21 envs")
+
+      let arch = os.arch()
+      if (arch === "arm64" && os.platform() === "win32") {
+        arch = "AARCH64"
+      } else if (arch === "x64" || os.platform() !== "darwin") {
+        arch = "X64"
+      }
+
+      // JAVA_HOME_21_AARCH64 - https://github.com/actions/partner-runner-images/blob/main/images/arm-windows-11-image.md#java
+      // JAVA_HOME_21_arm64 - https://github.com/actions/runner-images/blob/main/images/macos/macos-15-arm64-Readme.md#java
+      // JAVA_HOME_21_X64 - https://github.com/actions/runner-images/blob/main/images/ubuntu/Ubuntu2404-Readme.md#java
+      let newHomeVar = `JAVA_HOME_21_${arch}`
+      let newHome = process.env[newHomeVar]
+
+      if (newHome === "undefined") {
+        throw new Error(`JAVA_HOME is not Java 21+ needed for JRuby and \$${newHomeVar} is not defined`)
+      }
+
+      console.log(`Setting JAVA_HOME to ${newHomeVar} path ${newHome}`)
+
+      core.exportVariable("JAVA_HOME", newHome)
+    }
+  })
+}
+
+// Determines if two keys are an exact match for the purposes of cache matching
+// Specifically, this is a case-insensitive match that ignores accents
+// From actions/cache@v3 src/utils/actionUtils.ts (MIT)
+export function isExactCacheKeyMatch(key, cacheKey) {
+  return !!(
+      cacheKey &&
+      cacheKey.localeCompare(key, undefined, {
+          sensitivity: 'accent'
+      }) === 0
+  );
+}

gemfiles/bundler-dev.gemfile

@@ -0,0 +1,3 @@
+source 'https://rubygems.org'
+
+gem "path"

gemfiles/bundler-dev.gemfile.lock

@@ -0,0 +1,13 @@
+GEM
+  remote: https://rubygems.org/
+  specs:
+    path (2.0.1)
+
+PLATFORMS
+  x86_64-linux
+
+DEPENDENCIES
+  path
+
+BUNDLED WITH
+   2.4.0.dev

gemfiles/bundler1.gemfile

@@ -0,0 +1,3 @@
+source 'https://rubygems.org'
+
+gem "bundler", "~> 1.0"

gemfiles/gem_from_github.gemfile

@@ -0,0 +1,12 @@
+source "https://rubygems.org"
+
+# Ruby < 2.3 only support Bundler 1, which no longer works with gem github:
+if RUBY_VERSION >= '2.3'
+  unless Gem::Version.new(Bundler::VERSION) >= Gem::Version.new("2.2.0")
+    raise "Expected Bundler 2.2+ is used on Ruby >= 2.3"
+  end
+
+  # From https://github.com/ruby/setup-ruby/issues/358#issuecomment-1195899304
+  # Tests using github: and the repository uses a non-master default branch.
+  gem 'rack-test', github: 'rack/rack-test'
+end

gemfiles/rails7.gemfile

@@ -0,0 +1,3 @@
+source "https://rubygems.org"
+
+gem "rails", "~> 7.2.0"

gemfiles/rails8.gemfile

@@ -0,0 +1,3 @@
+source "https://rubygems.org"
+
+gem "rails", "~> 8.0.0"

generate-windows-versions.rb

@@ -0,0 +1,93 @@
+require 'open-uri'
+require 'yaml'
+require 'json'
+
+min_requirements = ['~> 2.0.0', '~> 2.1.9', '>= 2.2.6'].map { |req| Gem::Requirement.new(req) }
+
+url = 'https://raw.githubusercontent.com/oneclick/rubyinstaller.org-website/master/_data/downloads.yaml'
+entries = YAML.load(URI.open(url, &:read), symbolize_names: true)
+
+versions = entries.select { |entry|
+  entry[:filetype] == 'rubyinstaller7z' and
+  entry[:name].include?('(x64)') || entry[:name].include?('(arm)')
+}.group_by { |entry|
+  entry[:name][/Ruby (\d+\.\d+\.\d+)/, 1]
+}.map { |version, builds_by_version|
+  builds = builds_by_version.group_by { |entry|
+    entry[:name][/\((x64|arm)\)/, 1]
+  }.map { |arch, builds_by_arch|
+    arch = 'arm64' if arch == 'arm'
+    unless builds_by_arch.sort_by { |build| build[:name] } == builds_by_arch.reverse
+      raise "not sorted as expected for #{version}"
+    end
+    [arch, builds_by_arch.first[:href]]
+  }.sort_by { |arch, builds|
+    arch
+  }.to_h
+  [version, builds]
+}.sort_by { |version, entry|
+  Gem::Version.new(version)
+}.select { |version, entry|
+  min_requirements.any? { |req| req.satisfied_by?(Gem::Version.new(version)) }
+}.to_h
+
+latest_version = Gem::Version.new(versions.keys.last)
+head_version = Gem::Version.new("#{latest_version.bump}.0dev")
+
+versions['head'] = {
+  'arm64' => 'https://github.com/oneclick/rubyinstaller2/releases/download/rubyinstaller-head/rubyinstaller-head-arm.7z',
+  'x64' => 'https://github.com/oneclick/rubyinstaller2/releases/download/rubyinstaller-head/rubyinstaller-head-x64.7z'
+}
+versions['mingw'] = {
+  'x64' => 'https://github.com/MSP-Greg/ruby-loco/releases/download/ruby-master/ruby-mingw.7z'
+}
+versions['mswin'] = {
+  'x64' => 'https://github.com/MSP-Greg/ruby-loco/releases/download/ruby-master/ruby-mswin.7z'
+}
+versions['ucrt'] = {
+  'x64' => 'https://github.com/MSP-Greg/ruby-loco/releases/download/ruby-master/ruby-ucrt.7z'
+}
+
+File.binwrite 'windows-versions.json', "#{JSON.pretty_generate(versions)}\n"
+
+base_url = 'https://github.com/ruby/setup-msys2-gcc/releases/latest/download/windows-toolchain.json'
+windows_toolchain = JSON.parse(URI.open(base_url, &:read), symbolize_names: true)
+
+versions.each do |raw_version, archs|
+  version = Gem::Version.correct?(raw_version) ? Gem::Version.new(raw_version) : head_version
+
+  archs.each_key do |raw_arch|
+    arch = raw_arch == 'arm64' ? 'aarch64' : raw_arch
+
+    platform =
+      case raw_version
+      when 'head', 'ucrt'
+        "#{arch}-mingw-ucrt"
+      when 'mingw'
+        "#{arch}-mingw32"
+      when 'mswin'
+        "#{arch}-mswin64"
+      else
+        if version >= Gem::Version.new('3.1.0.dev')
+          "#{arch}-mingw-ucrt"
+        else
+          "#{arch}-mingw32"
+        end
+      end
+
+    toolchain =
+      windows_toolchain.select do |pkg|
+        pkg[:platform] == platform && pkg[:required_ruby_version].any? do |requirement|
+          Gem::Requirement.new(requirement).satisfied_by?(version)
+        end
+      end
+
+    unless toolchain.one?
+      raise "#{toolchain.empty? ? 'no' : 'multiple'} toolchains found for #{raw_version} #{raw_arch}: #{toolchain}"
+    end
+
+    archs[raw_arch] = URI.join(base_url, toolchain.first[:href])
+  end
+end
+
+File.binwrite 'windows-toolchain-versions.json', "#{JSON.pretty_generate(versions)}\n"

index.js

@@ -1,94 +1,232 @@
 const os = require('os')
 const fs = require('fs')
+const path = require('path')
 const core = require('@actions/core')
-const io = require('@actions/io')
-const tc = require('@actions/tool-cache')
-const axios = require('axios')
+const exec = require('@actions/exec')
+const common = require('./common')
+const rubygems = require('./rubygems')
+const bundler = require('./bundler')
 
-const releasesURL = 'https://github.com/eregon/ruby-install-builder/releases'
-const metadataURL = 'https://raw.githubusercontent.com/eregon/ruby-install-builder/metadata'
+const windows = common.windows
 
-async function run() {
+const inputDefaults = {
+  'ruby-version': 'default',
+  'rubygems': 'default',
+  'bundler': 'Gemfile.lock',
+  'bundler-cache': 'false',
+  'working-directory': '.',
+  'cache-version': bundler.DEFAULT_CACHE_VERSION,
+  'self-hosted': 'false',
+  'windows-toolchain': 'default',
+}
+
+// entry point when this action is run on its own
+export async function run() {
   try {
-    const ruby = await getRubyEngineAndVersion(core.getInput('ruby-version'))
-
-    const rubiesDir = `${process.env.HOME}/.rubies`
-    await io.mkdirP(rubiesDir)
-
-    const platform = getVirtualEnvironmentName()
-    const tag = await getLatestReleaseTag()
-    const url = `${releasesURL}/download/${tag}/${ruby}-${platform}.tar.gz`
-    console.log(url)
-
-    const downloadPath = await tc.downloadTool(url)
-    await tc.extractTar(downloadPath, rubiesDir)
-
-    const rubyPrefix = `${rubiesDir}/${ruby}`
-    core.addPath(`${rubyPrefix}/bin`)
-    core.setOutput('ruby-prefix', rubyPrefix)
+    await setupRuby()
   } catch (error) {
-    core.setFailed(error.message)
+    if (/\bprocess\b.+\bfailed\b/.test(error.message)) {
+      core.setFailed(error.message)
+    } else {
+      core.setFailed(error.stack)
+    }
   }
+  // Explicit process.exit() to not wait hanging promises,
+  // see https://github.com/ruby/setup-ruby/issues/543
+  process.exit()
 }
 
-async function getLatestReleaseTag() {
-  const response = await axios.get(`${metadataURL}/latest_release.tag`)
-  return response.data.trim()
+// entry point when this action is run from other actions
+export async function setupRuby(options = {}) {
+  const inputs = { ...options }
+  for (const key in inputDefaults) {
+    if (!Object.prototype.hasOwnProperty.call(inputs, key)) {
+      inputs[key] = core.getInput(key) || inputDefaults[key]
+    }
+  }
+  common.inputs.selfHosted = inputs['self-hosted']
+
+  process.chdir(inputs['working-directory'])
+
+  const platform = common.getOSNameVersion()
+  const [engine, parsedVersion] = parseRubyEngineAndVersion(inputs['ruby-version'])
+
+  let installer
+  if (platform.startsWith('windows-') && engine === 'ruby' && !common.isSelfHostedRunner()) {
+    installer = require('./windows')
+  } else {
+    installer = require('./ruby-builder')
+  }
+
+  let version
+  if (common.isSelfHostedRunner()) {
+    // The list of available Rubies in the hostedtoolcache is unrelated to getAvailableVersions()
+    version = parsedVersion
+  } else {
+    const engineVersions = installer.getAvailableVersions(platform, engine)
+    version = validateRubyEngineAndVersion(platform, engineVersions, engine, parsedVersion)
+  }
+
+  createGemRC(engine, version)
+  envPreInstall()
+
+  const rubyPrefix = await installer.install(platform, engine, version)
+
+  await common.measure('Print Ruby version', async () =>
+    await exec.exec('ruby', ['--version']))
+
+  const rubygemsInputSet = inputs['rubygems'] !== 'default'
+  if (rubygemsInputSet) {
+    await common.measure('Updating RubyGems', async () =>
+      rubygems.rubygemsUpdate(inputs['rubygems'], rubyPrefix, platform, engine, version))
+  }
+
+  // When setup-ruby is used by other actions, this allows code in them to run
+  // before 'bundle install'.  Installed dependencies may require additional
+  // libraries & headers, build tools, etc.
+  if (inputs['afterSetupPathHook'] instanceof Function) {
+    await inputs['afterSetupPathHook']({ platform, rubyPrefix, engine, version })
+  }
+
+  const [gemfile, lockFile] = bundler.detectGemfiles()
+  let bundlerVersion = 'unknown'
+
+  if (inputs['bundler'] !== 'none') {
+    bundlerVersion = await common.measure('Installing Bundler', async () =>
+      bundler.installBundler(inputs['bundler'], rubygemsInputSet, lockFile, platform, rubyPrefix, engine, version))
+  }
+
+  if (inputs['bundler-cache'] === 'true') {
+    await common.time('bundle install', async () =>
+      bundler.bundleInstall(gemfile, lockFile, platform, engine, version, bundlerVersion, inputs['cache-version']))
+
+    if (lockFile !== null && fs.existsSync(lockFile)) {
+      await core.group(`Print lockfile`, async () =>
+        await exec.exec('cat', [lockFile]))
+    }
+  }
+
+  core.setOutput('ruby-prefix', rubyPrefix)
 }
 
-async function getRubyEngineAndVersion(rubyVersion) {
+function parseRubyEngineAndVersion(rubyVersion) {
+  if (rubyVersion === 'default') {
+    if (fs.existsSync('.ruby-version')) {
+      rubyVersion = '.ruby-version'
+    } else if (fs.existsSync('.tool-versions')) {
+      rubyVersion = '.tool-versions'
+    } else if (fs.existsSync('mise.toml')) {
+      rubyVersion = 'mise.toml'
+    } else {
+      throw new Error('input ruby-version needs to be specified if no .ruby-version or .tool-versions file exists')
+    }
+  }
+
+  if (rubyVersion === '.ruby-version') { // Read from .ruby-version
+    rubyVersion = fs.readFileSync('.ruby-version', 'utf8').trim()
+    console.log(`Using ${rubyVersion} as input from file .ruby-version`)
+  } else if (rubyVersion === '.tool-versions') { // Read from .tool-versions
+    const toolVersions = fs.readFileSync('.tool-versions', 'utf8').trim()
+    const regexp = /^ruby\s+(\S+)/
+    const rubyLine = toolVersions.split(/\r?\n/).filter(e => regexp.test(e))[0]
+    rubyVersion = rubyLine.match(regexp)[1]
+    console.log(`Using ${rubyVersion} as input from file .tool-versions`)
+  } else if (rubyVersion === 'mise.toml') { // Read from mise.toml
+    const toolVersions = fs.readFileSync('mise.toml', 'utf8').trim()
+    const regexp = /^ruby\s*=\s*['"](.+)['"]$/
+    const rubyLine = toolVersions.split(/\r?\n/).filter(e => regexp.test(e))[0]
+    rubyVersion = rubyLine.match(regexp)[1]
+    console.log(`Using ${rubyVersion} as input from file mise.toml`)
+  }
+
   let engine, version
-  if (rubyVersion.match(/^\d+/)) { // X.Y.Z => ruby-X.Y.Z
+  if (/^(\d+)/.test(rubyVersion) || common.isHeadVersion(rubyVersion)) { // X.Y.Z => ruby-X.Y.Z
     engine = 'ruby'
     version = rubyVersion
   } else if (!rubyVersion.includes('-')) { // myruby -> myruby-stableVersion
     engine = rubyVersion
-    version = '' // Let the logic below find the version
+    version = '' // Let the logic in validateRubyEngineAndVersion() find the version
   } else { // engine-X.Y.Z
-    [engine, version] = rubyVersion.split('-', 2)
+    [engine, version] = common.partition(rubyVersion, '-')
   }
 
-  const response = await axios.get(`${metadataURL}/versions.json`)
-  const stableVersions = response.data
-  const engineVersions = stableVersions[engine]
+  return [engine, version]
+}
+
+function validateRubyEngineAndVersion(platform, engineVersions, engine, parsedVersion) {
   if (!engineVersions) {
-    throw new Error(`Unknown engine ${engine} (${rubyVersion})`)
+    throw new Error(`Unknown engine ${engine} on ${platform}`)
   }
 
-  if (!engineVersions.includes(version)) {
-    engineVersions.reverse() // inplace!
-    let found = engineVersions.find(v => v.startsWith(version))
+  let version = parsedVersion
+  if (!engineVersions.includes(parsedVersion)) {
+    const latestToFirstVersion = engineVersions.slice().reverse()
+    // Try to match stable versions first, so an empty version (engine-only) matches the latest stable version
+    let found = latestToFirstVersion.find(v => common.isStableVersion(engine, v) && v.startsWith(parsedVersion))
+    if (!found) {
+      // Exclude head versions, they must be exact matches
+      found = latestToFirstVersion.find(v => !common.isHeadVersion(v) && v.startsWith(parsedVersion))
+    }
+
     if (found) {
       version = found
     } else {
-      throw new Error(`Unknown version ${version} (${rubyVersion})`)
+      throw new Error(`Unknown version ${parsedVersion} for ${engine} on ${platform}
+        Available versions for ${engine} on ${platform}: ${engineVersions.join(', ')}
+        Make sure you use the latest version of the action with - uses: ruby/setup-ruby@v1`)
     }
   }
 
-  return engine + '-' + version
+  // Well known version-platform combinations which do not work:
+  if (engine === 'ruby' && platform.startsWith('macos') && os.arch() === 'arm64' && common.floatVersion(version) < 2.6) {
+    throw new Error(`CRuby < 2.6 does not support macos-arm64.
+        Either use a newer Ruby version or use a macOS image running on amd64, e.g., macos-13.
+        Note that GitHub changed the meaning of macos-latest from macos-12 (amd64) to macos-14 (arm64):
+        https://github.blog/changelog/2024-04-01-macos-14-sonoma-is-generally-available-and-the-latest-macos-runner-image/
+
+        If you are using a matrix of Ruby versions, a good solution is to run only < 2.6 on amd64, like so:
+        matrix:
+          ruby: ['2.4', '2.5', '2.6', '2.7', '3.0', '3.1', '3.2', '3.3']
+          os: [ ubuntu-latest, macos-latest ]
+          # CRuby < 2.6 does not support macos-arm64, so test those on amd64 instead
+          exclude:
+          - { os: macos-latest, ruby: '2.4' }
+          - { os: macos-latest, ruby: '2.5' }
+          include:
+          - { os: macos-13, ruby: '2.4' }
+          - { os: macos-13, ruby: '2.5' }
+
+        But of course you should consider dropping support for these long-EOL Rubies, which cannot even be built on recent macOS machines.`)
+  } else if (engine === 'truffleruby' && platform.startsWith('windows')) {
+    throw new Error('TruffleRuby does not currently support Windows.')
+  }
+
+  return version
 }
 
-function getVirtualEnvironmentName() {
-  const platform = os.platform()
-  if (platform == 'linux') {
-    return `ubuntu-${findUbuntuVersion()}`
-  } else if (platform == 'darwin') {
-    return 'macos-latest'
-  } else if (platform == 'win32') {
-    return 'windows-latest'
-  } else {
-    throw new Error(`Unknown platform ${platform}`)
+function createGemRC(engine, version) {
+  const gemrc = path.join(os.homedir(), '.gemrc')
+  if (!fs.existsSync(gemrc)) {
+    if (engine === 'ruby' && common.floatVersion(version) < 2.0) {
+      fs.writeFileSync(gemrc, `install: --no-rdoc --no-ri${os.EOL}update: --no-rdoc --no-ri${os.EOL}`)
+    } else {
+      fs.writeFileSync(gemrc, `gem: --no-document${os.EOL}`)
+    }
   }
 }
 
-function findUbuntuVersion() {
-  const lsb_release = fs.readFileSync('/etc/lsb-release', 'utf8')
-  const match = lsb_release.match(/^DISTRIB_RELEASE=(\d+\.\d+)$/m)
-  if (match) {
-    return match[1]
-  } else {
-    throw new Error('Could not find Ubuntu version')
+// sets up ENV variables
+// currently only used on Windows runners
+function envPreInstall() {
+  const ENV = process.env
+  if (windows) {
+    // puts normal Ruby temp folder on SSD
+    core.exportVariable('TMPDIR', ENV['RUNNER_TEMP'])
+    // bash - sets home to match native windows, normally C:\Users\<user name>
+    core.exportVariable('HOME', ENV['HOMEDRIVE'] + ENV['HOMEPATH'])
+    // bash - needed to maintain Path from Windows
+    core.exportVariable('MSYS2_PATH_TYPE', 'inherit')
   }
 }
 
-run()
+if (__filename.endsWith('index.js')) { run() }

new-versions.rb

@@ -0,0 +1,62 @@
+versions = ARGV.fetch(0).split(',').map(&:strip)
+p versions
+
+versions.each do |engine_version|
+  puts engine_version
+  engine, version = engine_version.split('-', 2)
+  p [engine, version]
+
+  if engine == 'windows'
+    require_relative 'generate-windows-versions'
+    exit
+  end
+
+  match = case engine
+  when 'ruby', 'jruby'
+    /^\d+\.\d+\./
+  when 'truffleruby', 'truffleruby+graalvm'
+    /^\d+\./
+  end
+
+  raise engine_version unless version[match]
+
+  # Update ruby-builder-versions.json
+  file = "#{__dir__}/ruby-builder-versions.json"
+  lines = File.readlines(file, chomp: true)
+
+  from = lines.index { |line| line.include?(%{"#{engine}": [}) }
+  raise "Could not find start of #{engine}" unless from
+  to = from
+  to += 1 until lines[to].include?(']')
+
+  from += 1 # [
+  to -= 2 # head, ]
+
+  puts lines[from..to]
+
+  release_line = lines[from..to].find { |line|
+    v = line[/"([^"]+)"/, 1] and v[match] == version[match]
+  }
+
+  if release_line
+    append = " #{version.inspect},"
+    release_line << append unless release_line.end_with?(append)
+  else
+    lines.insert to+1, "    #{version.inspect},"
+  end
+
+  File.write(file, lines.join("\n") + "\n")
+
+  # Update README.md
+  file = "#{__dir__}/README.md"
+  lines = File.readlines(file)
+  engine_line = lines.find { |line| line.start_with?("| `#{engine}`") }
+  engine_line.sub!(/(.+ (?:-|until)) (\d+(?:\.\d+)+(?:-\w+)?)/) do
+    if Gem::Version.new(version) > Gem::Version.new($2)
+      "#{$1} #{version}"
+    else
+      $&
+    end
+  end
+  File.write(file, lines.join)
+end

package.json

@@ -1,15 +1,15 @@
 {
-  "name": "use-ruby-action",
+  "name": "setup-ruby",
   "version": "0.1.0",
-  "description": "Download a prebuilt ruby and add it to $PATH",
+  "description": "Download a prebuilt Ruby and add it to the PATH in 5 seconds",
   "main": "index.js",
+  "license": "MIT",
   "scripts": {
-    "lint": "eslint index.js",
     "package": "ncc build index.js -o dist"
   },
   "repository": {
     "type": "git",
-    "url": "git+https://github.com/eregon/use-ruby-action.git"
+    "url": "git+https://github.com/ruby/setup-ruby.git"
   },
   "keywords": [
     "GitHub",
@@ -17,19 +17,20 @@
     "Ruby"
   ],
   "author": "Benoit Daloze",
-  "license": "MIT",
   "bugs": {
-    "url": "https://github.com/eregon/use-ruby-action/issues"
+    "url": "https://github.com/ruby/setup-ruby/issues"
   },
-  "homepage": "https://github.com/eregon/use-ruby-action",
+  "homepage": "https://github.com/ruby/setup-ruby",
   "dependencies": {
-    "@actions/core": "^1.1.1",
-    "@actions/io": "^1.0.1",
-    "@actions/tool-cache": "^1.1.2",
-    "axios": "^0.19.0"
+    "@actions/cache": "^4.0.3",
+    "@actions/core": "^1.11.1",
+    "@actions/exec": "^1.1.1",
+    "@actions/io": "^1.1.3",
+    "@actions/tool-cache": "^2",
+    "linux-os-info": "^2.0.0",
+    "semver": "^7.7.2"
   },
   "devDependencies": {
-    "@zeit/ncc": "^0.20.5",
-    "eslint": "^6.3.0"
+    "@vercel/ncc": "^0.38.3"
   }
 }

pre-commit

@@ -0,0 +1,8 @@
+#!/bin/sh
+set -e
+
+if [ "$(dirname "$0")" != ".git/hooks" ] || git diff --cached --name-only | grep -E '.(js|json)$|yarn.lock'; then
+  yarn install
+  yarn run package
+  exec git add dist/index.js
+fi

release.rb

@@ -0,0 +1,17 @@
+require 'json'
+
+def run(command_line)
+  puts "$ #{command_line}"
+  output = `#{command_line}`
+  puts output
+  raise $?.inspect unless $?.success?
+  output
+end
+
+latest_release_tag = run 'gh release view --json tagName'
+latest_release_tag = JSON.load(latest_release_tag).fetch('tagName')
+
+raise latest_release_tag unless latest_release_tag =~ /\Av(\d+).(\d+).(\d+)\z/
+tag = "v#{$1}.#{Integer($2)+1}.0"
+
+run "gh release create --generate-notes --latest #{tag}"

ruby-builder-versions.json

@@ -0,0 +1,44 @@
+{
+  "ruby": [
+    "1.9.3-p551",
+    "2.0.0-p648",
+    "2.1.9",
+    "2.2.10",
+    "2.3.0", "2.3.1", "2.3.2", "2.3.3", "2.3.4", "2.3.5", "2.3.6", "2.3.7", "2.3.8",
+    "2.4.0", "2.4.1", "2.4.2", "2.4.3", "2.4.4", "2.4.5", "2.4.6", "2.4.7", "2.4.9", "2.4.10",
+    "2.5.0", "2.5.1", "2.5.2", "2.5.3", "2.5.4", "2.5.5", "2.5.6", "2.5.7", "2.5.8", "2.5.9",
+    "2.6.0", "2.6.1", "2.6.2", "2.6.3", "2.6.4", "2.6.5", "2.6.6", "2.6.7", "2.6.8", "2.6.9", "2.6.10",
+    "2.7.0", "2.7.1", "2.7.2", "2.7.3", "2.7.4", "2.7.5", "2.7.6", "2.7.7", "2.7.8",
+    "3.0.0-preview1", "3.0.0-preview2", "3.0.0-rc1", "3.0.0", "3.0.1", "3.0.2", "3.0.3", "3.0.4", "3.0.5", "3.0.6", "3.0.7",
+    "3.1.0-preview1", "3.1.0", "3.1.1", "3.1.2", "3.1.3", "3.1.4", "3.1.5", "3.1.6", "3.1.7",
+    "3.2.0-preview1", "3.2.0-preview2", "3.2.0-preview3", "3.2.0-rc1", "3.2.0", "3.2.1", "3.2.2", "3.2.3", "3.2.4", "3.2.5", "3.2.6", "3.2.7", "3.2.8", "3.2.9",
+    "3.3.0-preview1", "3.3.0-preview2", "3.3.0-preview3", "3.3.0-rc1", "3.3.0", "3.3.1", "3.3.2", "3.3.3", "3.3.4", "3.3.5", "3.3.6", "3.3.7", "3.3.8", "3.3.9",
+    "3.4.0-preview1", "3.4.0-preview2", "3.4.0-rc1", "3.4.0", "3.4.1", "3.4.2", "3.4.3", "3.4.4", "3.4.5",
+    "3.5.0-preview1",
+    "head", "debug", "asan", "3.4-asan"
+  ],
+  "jruby": [
+    "9.1.17.0",
+    "9.2.9.0", "9.2.10.0", "9.2.11.0", "9.2.11.1", "9.2.12.0", "9.2.13.0", "9.2.14.0", "9.2.15.0", "9.2.16.0", "9.2.17.0", "9.2.18.0", "9.2.19.0", "9.2.20.0", "9.2.20.1", "9.2.21.0",
+    "9.3.0.0", "9.3.1.0", "9.3.2.0", "9.3.3.0", "9.3.4.0", "9.3.6.0", "9.3.7.0", "9.3.8.0", "9.3.9.0", "9.3.10.0", "9.3.11.0", "9.3.13.0", "9.3.14.0", "9.3.15.0",
+    "9.4.0.0", "9.4.1.0", "9.4.2.0", "9.4.3.0", "9.4.4.0", "9.4.5.0", "9.4.6.0", "9.4.7.0", "9.4.8.0", "9.4.9.0", "9.4.10.0", "9.4.11.0", "9.4.12.0", "9.4.12.1", "9.4.13.0", "9.4.14.0",
+    "10.0.0.0", "10.0.0.1", "10.0.1.0", "10.0.2.0",
+    "head"
+  ],
+  "truffleruby": [
+    "19.3.0", "19.3.1",
+    "20.0.0", "20.1.0", "20.2.0", "20.3.0",
+    "21.0.0", "21.1.0", "21.2.0", "21.2.0.1", "21.3.0",
+    "22.0.0.2", "22.1.0", "22.2.0", "22.3.0", "22.3.1",
+    "23.0.0-preview1", "23.0.0", "23.1.0", "23.1.1", "23.1.2",
+    "24.0.0", "24.0.1", "24.0.2", "24.1.0", "24.1.1", "24.1.2", "24.2.0", "24.2.1",
+    "head"
+  ],
+  "truffleruby+graalvm": [
+    "21.2.0", "21.3.0",
+    "22.0.0.2", "22.1.0", "22.2.0", "22.3.0", "22.3.1",
+    "23.0.0-preview1", "23.0.0", "23.1.0", "23.1.1", "23.1.2",
+    "24.0.0", "24.0.1", "24.0.2", "24.1.0", "24.1.1", "24.1.2", "24.2.0", "24.2.1",
+    "head"
+  ]
+}

ruby-builder.js

@@ -0,0 +1,144 @@
+const os = require('os')
+const fs = require('fs')
+const path = require('path')
+const core = require('@actions/core')
+const exec = require('@actions/exec')
+const io = require('@actions/io')
+const tc = require('@actions/tool-cache')
+const common = require('./common')
+const rubyBuilderVersions = require('./ruby-builder-versions')
+
+const builderReleaseTag = 'toolcache'
+const releasesURL = 'https://github.com/ruby/ruby-builder/releases'
+
+const windows = common.windows
+
+export function getAvailableVersions(platform, engine) {
+  return rubyBuilderVersions[engine]
+}
+
+export async function install(platform, engine, version) {
+  let rubyPrefix, inToolCache
+  if (common.shouldUseToolCache(engine, version)) {
+    inToolCache = common.toolCacheFind(engine, version)
+    if (inToolCache) {
+      rubyPrefix = inToolCache
+    } else {
+      const toolCacheRubyPrefix = common.getToolCacheRubyPrefix(platform, engine, version)
+      if (common.isSelfHostedRunner()) {
+        const rubyBuildDefinition = engine === 'ruby' ? version : `${engine}-${version}`
+        core.error(
+          `The current runner (${common.getOSNameVersionArch()}) was detected as self-hosted because ${common.selfHostedRunnerReason()}.\n` +
+          `In such a case, you should install Ruby in the $RUNNER_TOOL_CACHE yourself, for example using https://github.com/rbenv/ruby-build\n` +
+          `You can take inspiration from this workflow for more details: https://github.com/ruby/ruby-builder/blob/master/.github/workflows/build.yml\n` +
+          `$ ruby-build ${rubyBuildDefinition} ${toolCacheRubyPrefix}\n` +
+          `Once that completes successfully, mark it as complete with:\n` +
+          `$ touch ${common.toolCacheCompleteFile(toolCacheRubyPrefix)}\n` +
+          `It is your responsibility to ensure installing Ruby like that is not done in parallel.\n`)
+        process.exit(1)
+      } else {
+        rubyPrefix = toolCacheRubyPrefix
+      }
+    }
+  } else if (windows) {
+    rubyPrefix = path.join(`${common.drive}:`, `${engine}-${version}`)
+  } else {
+    rubyPrefix = path.join(os.homedir(), '.rubies', `${engine}-${version}`)
+  }
+
+  const paths = [path.join(rubyPrefix, 'bin')]
+
+  // JRuby can use compiled extension code via ffi, so make sure gcc exists.
+  if (platform.startsWith('windows') && engine === 'jruby') {
+    paths.push(...await require('./windows').installJRubyTools())
+  }
+
+  // Set the PATH now, so the MSYS2 'tar' is in Path on Windows
+  common.setupPath(paths)
+
+  if (!inToolCache) {
+    await io.mkdirP(rubyPrefix)
+    await downloadAndExtract(platform, engine, version, rubyPrefix)
+  }
+
+  // Ensure JRuby has minimum Java version to run
+  if (engine === "jruby") {
+    await common.setupJavaHome(rubyPrefix)
+  }
+
+  return rubyPrefix
+}
+
+async function downloadAndExtract(platform, engine, version, rubyPrefix) {
+  const parentDir = path.dirname(rubyPrefix)
+
+  const downloadPath = await common.measure('Downloading Ruby', async () => {
+    const url = getDownloadURL(platform, engine, version)
+    console.log(url)
+    try {
+      return await tc.downloadTool(url)
+    } catch (error) {
+      if (error.message.includes('404')) {
+        throw new Error(`Unavailable version ${version} for ${engine} on ${platform}
+          You can request it at https://github.com/ruby/setup-ruby/issues
+          Cause: ${error.message}`)
+      } else {
+        throw error
+      }
+    }
+  })
+
+  await common.measure('Extracting  Ruby', async () => {
+    if (windows) {
+      // Windows 2016 doesn't have system tar, use MSYS2's, it needs unix style paths
+      await exec.exec('tar', ['-xz', '-C', common.win2nix(parentDir), '-f', common.win2nix(downloadPath)])
+    } else {
+      await exec.exec('tar', ['-xz', '-C', parentDir, '-f', downloadPath])
+    }
+  })
+
+  if (common.shouldUseToolCache(engine, version)) {
+    common.createToolCacheCompleteFile(rubyPrefix)
+  }
+}
+
+function getDownloadURL(platform, engine, version) {
+  let builderPlatform = null
+  if (platform.startsWith('windows-')) {
+    if (os.arch() === 'x64') {
+      builderPlatform = 'windows-latest'
+    } else if (os.arch() === 'arm64') {
+      builderPlatform = 'windows-arm64'
+    }
+  } else if (platform.startsWith('macos-')) {
+    if (os.arch() === 'x64') {
+      builderPlatform = 'macos-latest'
+    } else if (os.arch() === 'arm64') {
+      builderPlatform = 'macos-13-arm64'
+    }
+  } else if (platform.startsWith('ubuntu-')) {
+    if (os.arch() === 'x64') {
+      builderPlatform = platform
+    } else if (os.arch() === 'arm64') {
+      builderPlatform = `${platform}-arm64`
+    }
+  }
+
+  if (builderPlatform === null) {
+    throw new Error(`Unknown download URL for platform ${platform}`)
+  }
+
+  if (common.isHeadVersion(version)) {
+    return getLatestHeadBuildURL(builderPlatform, engine, version)
+  } else {
+    return `${releasesURL}/download/${builderReleaseTag}/${engine}-${version}-${builderPlatform}.tar.gz`
+  }
+}
+
+function getLatestHeadBuildURL(platform, engine, version) {
+  var repo = `${engine}-dev-builder`
+  if (engine === 'truffleruby+graalvm') {
+    repo = 'truffleruby-dev-builder'
+  }
+  return `https://github.com/ruby/${repo}/releases/latest/download/${engine}-${version}-${platform}.tar.gz`
+}

rubygems.js

@@ -0,0 +1,62 @@
+const common = require('./common')
+const path = require('path')
+const exec = require('@actions/exec')
+const semver = require('semver')
+
+export async function rubygemsUpdate(rubygemsVersionInput, rubyPrefix, platform, engine, rubyVersion) {
+  const gem = path.join(rubyPrefix, 'bin', 'gem')
+
+  let gemVersion = ''
+
+  await exec.exec(gem, ['--version'], {
+    listeners: {
+      stdout: (data) => (gemVersion += data.toString()),
+    }
+  });
+
+  gemVersion = semver.coerce(gemVersion.trim())
+  console.log(`Default RubyGems version is ${gemVersion}`)
+
+  if (rubygemsVersionInput === 'latest') {
+    console.log('Updating RubyGems to latest version')
+    await rubygemsLatest(gem, platform, engine, rubyVersion)
+  } else if (semver.gt(rubygemsVersionInput, gemVersion)) {
+    console.log(`Updating RubyGems to ${rubygemsVersionInput}`)
+    await exec.exec(gem, ['update', '--system', rubygemsVersionInput])
+  } else {
+    console.log(`Skipping RubyGems update because the given version (${rubygemsVersionInput}) is not newer than the default version (${gemVersion})`)
+  }
+
+  return true
+}
+
+// Older RubyGems versions do not account for 'required_ruby_version' when
+// running 'gem update --system', so we have to force a compatible version of
+// rubygems-update.  See https://github.com/ruby/setup-ruby/pull/551 and
+// https://github.com/rubygems/rubygems/issues/7329
+async function rubygemsLatest(gem, platform, engine, rubyVersion) {
+  if (engine === 'ruby') {
+    const floatVersion = common.floatVersion(rubyVersion)
+    if (common.isHeadVersion(rubyVersion)) {
+      console.log('Ruby master builds use included RubyGems')
+    } else if (floatVersion >= 3.2) {
+      await exec.exec(gem, ['update', '--system'])
+    } else if (floatVersion >= 3.1) {
+      await exec.exec(gem, ['update', '--system', '3.6.9'])
+    } else if (floatVersion >= 3.0) {
+      await exec.exec(gem, ['update', '--system', '3.5.23'])
+    } else if (floatVersion >= 2.6) {
+      await exec.exec(gem, ['update', '--system', '3.4.22'])
+    } else if (floatVersion >= 2.3) {
+      await exec.exec(gem, ['update', '--system', '3.3.27'])
+    } else if (floatVersion >= 1.9) {
+      await exec.exec(`${gem} install rubygems-update -v 2.7.11 --no-document`)
+      await exec.exec('update_rubygems')
+    } else {
+      console.log(`Cannot update RubyGems for Ruby version ${rubyVersion}`)
+    }
+  } else {
+    // non MRI Rubies (TruffleRuby and JRuby)
+    await exec.exec(gem, ['update', '--system'])
+  }
+}

test_subprocess.rb

@@ -0,0 +1,13 @@
+require 'rbconfig'
+require 'stringio'
+
+puts "CPPFLAGS: #{RbConfig::CONFIG["CPPFLAGS"]}"
+
+$stderr = StringIO.new
+begin
+  system RbConfig.ruby, "-e", "p :OK"
+  out = $stderr.string
+ensure
+  $stderr = STDERR
+end
+abort out unless out.empty?

versions-strings-for-builder.rb

@@ -0,0 +1,33 @@
+require 'json'
+hash = File.read('ruby-builder-versions.json')
+versions = JSON.load(hash).transform_keys(&:to_sym)
+
+ONLY_LATEST_PATCH = ENV['ONLY_LATEST_PATCH']
+
+def filter(versions)
+  versions -= %w[head]
+  if ONLY_LATEST_PATCH
+    versions = versions.group_by { |v| v[/^\d+\.\d+/] }.map { _2.last }
+  end
+  versions
+end
+
+if ONLY_LATEST_PATCH
+  puts filter(versions[:ruby]).map { |v| "ruby-#{v}" }.join(', ')
+else
+  by_minor = versions[:ruby].group_by { |v| v[/^\d+\.\d+/] }
+  by_minor.each_pair do |minor, versions|
+    puts versions.map { |v| "ruby-#{v}" }.join(', ') if minor
+  end
+end
+
+puts
+puts filter(versions[:truffleruby]).map { |v| "truffleruby-#{v}" }.join(', ')
+
+puts
+puts filter(versions[:"truffleruby+graalvm"]).map { |v| "truffleruby+graalvm-#{v}" }.join(', ')
+
+puts
+puts filter(versions[:jruby]).map { |v| "jruby-#{v}" }.join(', ')
+puts "For Windows:"
+puts filter(versions[:jruby]).join(', ')

windows-toolchain-versions.json

@@ -0,0 +1,272 @@
+{
+  "2.0.0": {
+    "x64": "https://github.com/oneclick/rubyinstaller/releases/download/devkit-4.7.2/DevKit-mingw64-64-4.7.2-20130224-1432-sfx.exe"
+  },
+  "2.1.9": {
+    "x64": "https://github.com/oneclick/rubyinstaller/releases/download/devkit-4.7.2/DevKit-mingw64-64-4.7.2-20130224-1432-sfx.exe"
+  },
+  "2.2.6": {
+    "x64": "https://github.com/oneclick/rubyinstaller/releases/download/devkit-4.7.2/DevKit-mingw64-64-4.7.2-20130224-1432-sfx.exe"
+  },
+  "2.3.0": {
+    "x64": "https://github.com/oneclick/rubyinstaller/releases/download/devkit-4.7.2/DevKit-mingw64-64-4.7.2-20130224-1432-sfx.exe"
+  },
+  "2.3.1": {
+    "x64": "https://github.com/oneclick/rubyinstaller/releases/download/devkit-4.7.2/DevKit-mingw64-64-4.7.2-20130224-1432-sfx.exe"
+  },
+  "2.3.3": {
+    "x64": "https://github.com/oneclick/rubyinstaller/releases/download/devkit-4.7.2/DevKit-mingw64-64-4.7.2-20130224-1432-sfx.exe"
+  },
+  "2.4.1": {
+    "x64": "https://github.com/ruby/setup-msys2-gcc/releases/latest/download/msys2-mingw64-mingw-w64@r688-gcc@14-openssl@1.1.7z"
+  },
+  "2.4.2": {
+    "x64": "https://github.com/ruby/setup-msys2-gcc/releases/latest/download/msys2-mingw64-mingw-w64@r688-gcc@14-openssl@1.1.7z"
+  },
+  "2.4.3": {
+    "x64": "https://github.com/ruby/setup-msys2-gcc/releases/latest/download/msys2-mingw64-mingw-w64@r688-gcc@14-openssl@1.1.7z"
+  },
+  "2.4.4": {
+    "x64": "https://github.com/ruby/setup-msys2-gcc/releases/latest/download/msys2-mingw64-mingw-w64@r688-gcc@14-openssl@1.1.7z"
+  },
+  "2.4.5": {
+    "x64": "https://github.com/ruby/setup-msys2-gcc/releases/latest/download/msys2-mingw64-mingw-w64@r688-gcc@14-openssl@1.1.7z"
+  },
+  "2.4.6": {
+    "x64": "https://github.com/ruby/setup-msys2-gcc/releases/latest/download/msys2-mingw64-mingw-w64@r688-gcc@14-openssl@1.1.7z"
+  },
+  "2.4.7": {
+    "x64": "https://github.com/ruby/setup-msys2-gcc/releases/latest/download/msys2-mingw64-mingw-w64@r688-gcc@14-openssl@1.1.7z"
+  },
+  "2.4.9": {
+    "x64": "https://github.com/ruby/setup-msys2-gcc/releases/latest/download/msys2-mingw64-mingw-w64@r688-gcc@14-openssl@1.1.7z"
+  },
+  "2.4.10": {
+    "x64": "https://github.com/ruby/setup-msys2-gcc/releases/latest/download/msys2-mingw64-mingw-w64@r688-gcc@14-openssl@1.1.7z"
+  },
+  "2.5.0": {
+    "x64": "https://github.com/ruby/setup-msys2-gcc/releases/latest/download/msys2-mingw64-mingw-w64@r688-gcc@14-openssl@1.1.7z"
+  },
+  "2.5.1": {
+    "x64": "https://github.com/ruby/setup-msys2-gcc/releases/latest/download/msys2-mingw64-mingw-w64@r688-gcc@14-openssl@1.1.7z"
+  },
+  "2.5.3": {
+    "x64": "https://github.com/ruby/setup-msys2-gcc/releases/latest/download/msys2-mingw64-mingw-w64@r688-gcc@14-openssl@1.1.7z"
+  },
+  "2.5.5": {
+    "x64": "https://github.com/ruby/setup-msys2-gcc/releases/latest/download/msys2-mingw64-mingw-w64@r688-gcc@14-openssl@1.1.7z"
+  },
+  "2.5.6": {
+    "x64": "https://github.com/ruby/setup-msys2-gcc/releases/latest/download/msys2-mingw64-mingw-w64@r688-gcc@14-openssl@1.1.7z"
+  },
+  "2.5.7": {
+    "x64": "https://github.com/ruby/setup-msys2-gcc/releases/latest/download/msys2-mingw64-mingw-w64@r688-gcc@14-openssl@1.1.7z"
+  },
+  "2.5.8": {
+    "x64": "https://github.com/ruby/setup-msys2-gcc/releases/latest/download/msys2-mingw64-mingw-w64@r688-gcc@14-openssl@1.1.7z"
+  },
+  "2.5.9": {
+    "x64": "https://github.com/ruby/setup-msys2-gcc/releases/latest/download/msys2-mingw64-mingw-w64@r688-gcc@14-openssl@1.1.7z"
+  },
+  "2.6.0": {
+    "x64": "https://github.com/ruby/setup-msys2-gcc/releases/latest/download/msys2-mingw64-mingw-w64@r688-gcc@14-openssl@1.1.7z"
+  },
+  "2.6.1": {
+    "x64": "https://github.com/ruby/setup-msys2-gcc/releases/latest/download/msys2-mingw64-mingw-w64@r688-gcc@14-openssl@1.1.7z"
+  },
+  "2.6.2": {
+    "x64": "https://github.com/ruby/setup-msys2-gcc/releases/latest/download/msys2-mingw64-mingw-w64@r688-gcc@14-openssl@1.1.7z"
+  },
+  "2.6.3": {
+    "x64": "https://github.com/ruby/setup-msys2-gcc/releases/latest/download/msys2-mingw64-mingw-w64@r688-gcc@14-openssl@1.1.7z"
+  },
+  "2.6.4": {
+    "x64": "https://github.com/ruby/setup-msys2-gcc/releases/latest/download/msys2-mingw64-mingw-w64@r688-gcc@14-openssl@1.1.7z"
+  },
+  "2.6.5": {
+    "x64": "https://github.com/ruby/setup-msys2-gcc/releases/latest/download/msys2-mingw64-mingw-w64@r688-gcc@14-openssl@1.1.7z"
+  },
+  "2.6.6": {
+    "x64": "https://github.com/ruby/setup-msys2-gcc/releases/latest/download/msys2-mingw64-mingw-w64@r688-gcc@14-openssl@1.1.7z"
+  },
+  "2.6.7": {
+    "x64": "https://github.com/ruby/setup-msys2-gcc/releases/latest/download/msys2-mingw64-mingw-w64@r688-gcc@14-openssl@1.1.7z"
+  },
+  "2.6.8": {
+    "x64": "https://github.com/ruby/setup-msys2-gcc/releases/latest/download/msys2-mingw64-mingw-w64@r688-gcc@14-openssl@1.1.7z"
+  },
+  "2.6.9": {
+    "x64": "https://github.com/ruby/setup-msys2-gcc/releases/latest/download/msys2-mingw64-mingw-w64@r688-gcc@14-openssl@1.1.7z"
+  },
+  "2.6.10": {
+    "x64": "https://github.com/ruby/setup-msys2-gcc/releases/latest/download/msys2-mingw64-mingw-w64@r688-gcc@14-openssl@1.1.7z"
+  },
+  "2.7.0": {
+    "x64": "https://github.com/ruby/setup-msys2-gcc/releases/latest/download/msys2-mingw64-mingw-w64@r688-gcc@14-openssl@1.1.7z"
+  },
+  "2.7.1": {
+    "x64": "https://github.com/ruby/setup-msys2-gcc/releases/latest/download/msys2-mingw64-mingw-w64@r688-gcc@14-openssl@1.1.7z"
+  },
+  "2.7.2": {
+    "x64": "https://github.com/ruby/setup-msys2-gcc/releases/latest/download/msys2-mingw64-mingw-w64@r688-gcc@14-openssl@1.1.7z"
+  },
+  "2.7.3": {
+    "x64": "https://github.com/ruby/setup-msys2-gcc/releases/latest/download/msys2-mingw64-mingw-w64@r688-gcc@14-openssl@1.1.7z"
+  },
+  "2.7.4": {
+    "x64": "https://github.com/ruby/setup-msys2-gcc/releases/latest/download/msys2-mingw64-mingw-w64@r688-gcc@14-openssl@1.1.7z"
+  },
+  "2.7.5": {
+    "x64": "https://github.com/ruby/setup-msys2-gcc/releases/latest/download/msys2-mingw64-mingw-w64@r688-gcc@14-openssl@1.1.7z"
+  },
+  "2.7.6": {
+    "x64": "https://github.com/ruby/setup-msys2-gcc/releases/latest/download/msys2-mingw64-mingw-w64@r688-gcc@14-openssl@1.1.7z"
+  },
+  "2.7.7": {
+    "x64": "https://github.com/ruby/setup-msys2-gcc/releases/latest/download/msys2-mingw64-mingw-w64@r688-gcc@14-openssl@1.1.7z"
+  },
+  "2.7.8": {
+    "x64": "https://github.com/ruby/setup-msys2-gcc/releases/latest/download/msys2-mingw64-mingw-w64@r688-gcc@14-openssl@1.1.7z"
+  },
+  "3.0.0": {
+    "x64": "https://github.com/ruby/setup-msys2-gcc/releases/latest/download/msys2-mingw64-mingw-w64@r688-gcc@14-openssl@1.1.7z"
+  },
+  "3.0.1": {
+    "x64": "https://github.com/ruby/setup-msys2-gcc/releases/latest/download/msys2-mingw64-mingw-w64@r688-gcc@14-openssl@1.1.7z"
+  },
+  "3.0.2": {
+    "x64": "https://github.com/ruby/setup-msys2-gcc/releases/latest/download/msys2-mingw64-mingw-w64@r688-gcc@14-openssl@1.1.7z"
+  },
+  "3.0.3": {
+    "x64": "https://github.com/ruby/setup-msys2-gcc/releases/latest/download/msys2-mingw64-mingw-w64@r688-gcc@14-openssl@1.1.7z"
+  },
+  "3.0.4": {
+    "x64": "https://github.com/ruby/setup-msys2-gcc/releases/latest/download/msys2-mingw64-mingw-w64@r688-gcc@14-openssl@1.1.7z"
+  },
+  "3.0.5": {
+    "x64": "https://github.com/ruby/setup-msys2-gcc/releases/latest/download/msys2-mingw64-mingw-w64@r688-gcc@14-openssl@1.1.7z"
+  },
+  "3.0.6": {
+    "x64": "https://github.com/ruby/setup-msys2-gcc/releases/latest/download/msys2-mingw64-mingw-w64@r688-gcc@14-openssl@1.1.7z"
+  },
+  "3.0.7": {
+    "x64": "https://github.com/ruby/setup-msys2-gcc/releases/latest/download/msys2-mingw64-mingw-w64@r688-gcc@14-openssl@1.1.7z"
+  },
+  "3.1.0": {
+    "x64": "https://github.com/ruby/setup-msys2-gcc/releases/latest/download/msys2-ucrt64-mingw-w64@r688-gcc@14-openssl@1.1.7z"
+  },
+  "3.1.1": {
+    "x64": "https://github.com/ruby/setup-msys2-gcc/releases/latest/download/msys2-ucrt64-mingw-w64@r688-gcc@14-openssl@1.1.7z"
+  },
+  "3.1.2": {
+    "x64": "https://github.com/ruby/setup-msys2-gcc/releases/latest/download/msys2-ucrt64-mingw-w64@r688-gcc@14-openssl@1.1.7z"
+  },
+  "3.1.3": {
+    "x64": "https://github.com/ruby/setup-msys2-gcc/releases/latest/download/msys2-ucrt64-mingw-w64@r688-gcc@14-openssl@1.1.7z"
+  },
+  "3.1.4": {
+    "x64": "https://github.com/ruby/setup-msys2-gcc/releases/latest/download/msys2-ucrt64-mingw-w64@r688-gcc@14-openssl@1.1.7z"
+  },
+  "3.1.5": {
+    "x64": "https://github.com/ruby/setup-msys2-gcc/releases/latest/download/msys2-ucrt64-mingw-w64@r688-gcc@14-openssl@1.1.7z"
+  },
+  "3.1.6": {
+    "x64": "https://github.com/ruby/setup-msys2-gcc/releases/latest/download/msys2-ucrt64-mingw-w64@r688-gcc@14-openssl@1.1.7z"
+  },
+  "3.1.7": {
+    "x64": "https://github.com/ruby/setup-msys2-gcc/releases/latest/download/msys2-ucrt64-mingw-w64@r688-gcc@14-openssl@1.1.7z"
+  },
+  "3.2.0": {
+    "x64": "https://github.com/ruby/setup-msys2-gcc/releases/latest/download/msys2-ucrt64-mingw-w64@r688-gcc@14.7z"
+  },
+  "3.2.1": {
+    "x64": "https://github.com/ruby/setup-msys2-gcc/releases/latest/download/msys2-ucrt64-mingw-w64@r688-gcc@14.7z"
+  },
+  "3.2.2": {
+    "x64": "https://github.com/ruby/setup-msys2-gcc/releases/latest/download/msys2-ucrt64-mingw-w64@r688-gcc@14.7z"
+  },
+  "3.2.3": {
+    "x64": "https://github.com/ruby/setup-msys2-gcc/releases/latest/download/msys2-ucrt64-mingw-w64@r688-gcc@14.7z"
+  },
+  "3.2.4": {
+    "x64": "https://github.com/ruby/setup-msys2-gcc/releases/latest/download/msys2-ucrt64-mingw-w64@r688-gcc@14.7z"
+  },
+  "3.2.5": {
+    "x64": "https://github.com/ruby/setup-msys2-gcc/releases/latest/download/msys2-ucrt64-mingw-w64@r688-gcc@14.7z"
+  },
+  "3.2.6": {
+    "x64": "https://github.com/ruby/setup-msys2-gcc/releases/latest/download/msys2-ucrt64-mingw-w64@r688-gcc@14.7z"
+  },
+  "3.2.7": {
+    "x64": "https://github.com/ruby/setup-msys2-gcc/releases/latest/download/msys2-ucrt64-mingw-w64@r688-gcc@14.7z"
+  },
+  "3.2.8": {
+    "x64": "https://github.com/ruby/setup-msys2-gcc/releases/latest/download/msys2-ucrt64-mingw-w64@r688-gcc@14.7z"
+  },
+  "3.2.9": {
+    "x64": "https://github.com/ruby/setup-msys2-gcc/releases/latest/download/msys2-ucrt64.7z"
+  },
+  "3.3.0": {
+    "x64": "https://github.com/ruby/setup-msys2-gcc/releases/latest/download/msys2-ucrt64-mingw-w64@r688-gcc@14.7z"
+  },
+  "3.3.1": {
+    "x64": "https://github.com/ruby/setup-msys2-gcc/releases/latest/download/msys2-ucrt64-mingw-w64@r688-gcc@14.7z"
+  },
+  "3.3.2": {
+    "x64": "https://github.com/ruby/setup-msys2-gcc/releases/latest/download/msys2-ucrt64-mingw-w64@r688-gcc@14.7z"
+  },
+  "3.3.3": {
+    "x64": "https://github.com/ruby/setup-msys2-gcc/releases/latest/download/msys2-ucrt64-mingw-w64@r688-gcc@14.7z"
+  },
+  "3.3.4": {
+    "x64": "https://github.com/ruby/setup-msys2-gcc/releases/latest/download/msys2-ucrt64-mingw-w64@r688-gcc@14.7z"
+  },
+  "3.3.5": {
+    "x64": "https://github.com/ruby/setup-msys2-gcc/releases/latest/download/msys2-ucrt64-mingw-w64@r688-gcc@14.7z"
+  },
+  "3.3.6": {
+    "x64": "https://github.com/ruby/setup-msys2-gcc/releases/latest/download/msys2-ucrt64-mingw-w64@r688-gcc@14.7z"
+  },
+  "3.3.7": {
+    "x64": "https://github.com/ruby/setup-msys2-gcc/releases/latest/download/msys2-ucrt64-mingw-w64@r688-gcc@14.7z"
+  },
+  "3.3.8": {
+    "x64": "https://github.com/ruby/setup-msys2-gcc/releases/latest/download/msys2-ucrt64-mingw-w64@r688-gcc@14.7z"
+  },
+  "3.3.9": {
+    "x64": "https://github.com/ruby/setup-msys2-gcc/releases/latest/download/msys2-ucrt64.7z"
+  },
+  "3.4.1": {
+    "arm64": "https://github.com/ruby/setup-msys2-gcc/releases/latest/download/msys2-clangarm64-mingw-w64@r688.7z",
+    "x64": "https://github.com/ruby/setup-msys2-gcc/releases/latest/download/msys2-ucrt64-mingw-w64@r688-gcc@14.7z"
+  },
+  "3.4.2": {
+    "arm64": "https://github.com/ruby/setup-msys2-gcc/releases/latest/download/msys2-clangarm64-mingw-w64@r688.7z",
+    "x64": "https://github.com/ruby/setup-msys2-gcc/releases/latest/download/msys2-ucrt64-mingw-w64@r688-gcc@14.7z"
+  },
+  "3.4.3": {
+    "arm64": "https://github.com/ruby/setup-msys2-gcc/releases/latest/download/msys2-clangarm64-mingw-w64@r688.7z",
+    "x64": "https://github.com/ruby/setup-msys2-gcc/releases/latest/download/msys2-ucrt64-mingw-w64@r688-gcc@14.7z"
+  },
+  "3.4.4": {
+    "arm64": "https://github.com/ruby/setup-msys2-gcc/releases/latest/download/msys2-clangarm64.7z",
+    "x64": "https://github.com/ruby/setup-msys2-gcc/releases/latest/download/msys2-ucrt64.7z"
+  },
+  "3.4.5": {
+    "arm64": "https://github.com/ruby/setup-msys2-gcc/releases/latest/download/msys2-clangarm64.7z",
+    "x64": "https://github.com/ruby/setup-msys2-gcc/releases/latest/download/msys2-ucrt64.7z"
+  },
+  "head": {
+    "arm64": "https://github.com/ruby/setup-msys2-gcc/releases/latest/download/msys2-clangarm64.7z",
+    "x64": "https://github.com/ruby/setup-msys2-gcc/releases/latest/download/msys2-ucrt64.7z"
+  },
+  "mingw": {
+    "x64": "https://github.com/ruby/setup-msys2-gcc/releases/latest/download/msys2-mingw64.7z"
+  },
+  "mswin": {
+    "x64": "https://github.com/ruby/setup-msys2-gcc/releases/latest/download/vcpkg-x64-windows.7z"
+  },
+  "ucrt": {
+    "x64": "https://github.com/ruby/setup-msys2-gcc/releases/latest/download/msys2-ucrt64.7z"
+  }
+}

windows-versions.json

@@ -0,0 +1,272 @@
+{
+  "2.0.0": {
+    "x64": "https://github.com/oneclick/rubyinstaller/releases/download/ruby-2.0.0-p648/ruby-2.0.0-p648-x64-mingw32.7z"
+  },
+  "2.1.9": {
+    "x64": "https://github.com/oneclick/rubyinstaller/releases/download/ruby-2.1.9/ruby-2.1.9-x64-mingw32.7z"
+  },
+  "2.2.6": {
+    "x64": "https://github.com/oneclick/rubyinstaller/releases/download/ruby-2.2.6/ruby-2.2.6-x64-mingw32.7z"
+  },
+  "2.3.0": {
+    "x64": "https://github.com/oneclick/rubyinstaller/releases/download/ruby-2.3.0/ruby-2.3.0-x64-mingw32.7z"
+  },
+  "2.3.1": {
+    "x64": "https://github.com/oneclick/rubyinstaller/releases/download/ruby-2.3.1/ruby-2.3.1-x64-mingw32.7z"
+  },
+  "2.3.3": {
+    "x64": "https://github.com/oneclick/rubyinstaller/releases/download/ruby-2.3.3/ruby-2.3.3-x64-mingw32.7z"
+  },
+  "2.4.1": {
+    "x64": "https://github.com/oneclick/rubyinstaller2/releases/download/2.4.1-2/rubyinstaller-2.4.1-2-x64.7z"
+  },
+  "2.4.2": {
+    "x64": "https://github.com/oneclick/rubyinstaller2/releases/download/rubyinstaller-2.4.2-2/rubyinstaller-2.4.2-2-x64.7z"
+  },
+  "2.4.3": {
+    "x64": "https://github.com/oneclick/rubyinstaller2/releases/download/rubyinstaller-2.4.3-2/rubyinstaller-2.4.3-2-x64.7z"
+  },
+  "2.4.4": {
+    "x64": "https://github.com/oneclick/rubyinstaller2/releases/download/rubyinstaller-2.4.4-2/rubyinstaller-2.4.4-2-x64.7z"
+  },
+  "2.4.5": {
+    "x64": "https://github.com/oneclick/rubyinstaller2/releases/download/rubyinstaller-2.4.5-1/rubyinstaller-2.4.5-1-x64.7z"
+  },
+  "2.4.6": {
+    "x64": "https://github.com/oneclick/rubyinstaller2/releases/download/RubyInstaller-2.4.6-1/rubyinstaller-2.4.6-1-x64.7z"
+  },
+  "2.4.7": {
+    "x64": "https://github.com/oneclick/rubyinstaller2/releases/download/RubyInstaller-2.4.7-1/rubyinstaller-2.4.7-1-x64.7z"
+  },
+  "2.4.9": {
+    "x64": "https://github.com/oneclick/rubyinstaller2/releases/download/RubyInstaller-2.4.9-1/rubyinstaller-2.4.9-1-x64.7z"
+  },
+  "2.4.10": {
+    "x64": "https://github.com/oneclick/rubyinstaller2/releases/download/RubyInstaller-2.4.10-1/rubyinstaller-2.4.10-1-x64.7z"
+  },
+  "2.5.0": {
+    "x64": "https://github.com/oneclick/rubyinstaller2/releases/download/rubyinstaller-2.5.0-2/rubyinstaller-2.5.0-2-x64.7z"
+  },
+  "2.5.1": {
+    "x64": "https://github.com/oneclick/rubyinstaller2/releases/download/rubyinstaller-2.5.1-2/rubyinstaller-2.5.1-2-x64.7z"
+  },
+  "2.5.3": {
+    "x64": "https://github.com/oneclick/rubyinstaller2/releases/download/rubyinstaller-2.5.3-1/rubyinstaller-2.5.3-1-x64.7z"
+  },
+  "2.5.5": {
+    "x64": "https://github.com/oneclick/rubyinstaller2/releases/download/RubyInstaller-2.5.5-1/rubyinstaller-2.5.5-1-x64.7z"
+  },
+  "2.5.6": {
+    "x64": "https://github.com/oneclick/rubyinstaller2/releases/download/RubyInstaller-2.5.6-1/rubyinstaller-2.5.6-1-x64.7z"
+  },
+  "2.5.7": {
+    "x64": "https://github.com/oneclick/rubyinstaller2/releases/download/RubyInstaller-2.5.7-1/rubyinstaller-2.5.7-1-x64.7z"
+  },
+  "2.5.8": {
+    "x64": "https://github.com/oneclick/rubyinstaller2/releases/download/RubyInstaller-2.5.8-2/rubyinstaller-2.5.8-2-x64.7z"
+  },
+  "2.5.9": {
+    "x64": "https://github.com/oneclick/rubyinstaller2/releases/download/RubyInstaller-2.5.9-1/rubyinstaller-2.5.9-1-x64.7z"
+  },
+  "2.6.0": {
+    "x64": "https://github.com/oneclick/rubyinstaller2/releases/download/RubyInstaller-2.6.0-1/rubyinstaller-2.6.0-1-x64.7z"
+  },
+  "2.6.1": {
+    "x64": "https://github.com/oneclick/rubyinstaller2/releases/download/RubyInstaller-2.6.1-1/rubyinstaller-2.6.1-1-x64.7z"
+  },
+  "2.6.2": {
+    "x64": "https://github.com/oneclick/rubyinstaller2/releases/download/RubyInstaller-2.6.2-1/rubyinstaller-2.6.2-1-x64.7z"
+  },
+  "2.6.3": {
+    "x64": "https://github.com/oneclick/rubyinstaller2/releases/download/RubyInstaller-2.6.3-1/rubyinstaller-2.6.3-1-x64.7z"
+  },
+  "2.6.4": {
+    "x64": "https://github.com/oneclick/rubyinstaller2/releases/download/RubyInstaller-2.6.4-1/rubyinstaller-2.6.4-1-x64.7z"
+  },
+  "2.6.5": {
+    "x64": "https://github.com/oneclick/rubyinstaller2/releases/download/RubyInstaller-2.6.5-1/rubyinstaller-2.6.5-1-x64.7z"
+  },
+  "2.6.6": {
+    "x64": "https://github.com/oneclick/rubyinstaller2/releases/download/RubyInstaller-2.6.6-2/rubyinstaller-2.6.6-2-x64.7z"
+  },
+  "2.6.7": {
+    "x64": "https://github.com/oneclick/rubyinstaller2/releases/download/RubyInstaller-2.6.7-1/rubyinstaller-2.6.7-1-x64.7z"
+  },
+  "2.6.8": {
+    "x64": "https://github.com/oneclick/rubyinstaller2/releases/download/RubyInstaller-2.6.8-1/rubyinstaller-2.6.8-1-x64.7z"
+  },
+  "2.6.9": {
+    "x64": "https://github.com/oneclick/rubyinstaller2/releases/download/RubyInstaller-2.6.9-1/rubyinstaller-2.6.9-1-x64.7z"
+  },
+  "2.6.10": {
+    "x64": "https://github.com/oneclick/rubyinstaller2/releases/download/RubyInstaller-2.6.10-1/rubyinstaller-2.6.10-1-x64.7z"
+  },
+  "2.7.0": {
+    "x64": "https://github.com/oneclick/rubyinstaller2/releases/download/RubyInstaller-2.7.0-1/rubyinstaller-2.7.0-1-x64.7z"
+  },
+  "2.7.1": {
+    "x64": "https://github.com/oneclick/rubyinstaller2/releases/download/RubyInstaller-2.7.1-1/rubyinstaller-2.7.1-1-x64.7z"
+  },
+  "2.7.2": {
+    "x64": "https://github.com/oneclick/rubyinstaller2/releases/download/RubyInstaller-2.7.2-1/rubyinstaller-2.7.2-1-x64.7z"
+  },
+  "2.7.3": {
+    "x64": "https://github.com/oneclick/rubyinstaller2/releases/download/RubyInstaller-2.7.3-1/rubyinstaller-2.7.3-1-x64.7z"
+  },
+  "2.7.4": {
+    "x64": "https://github.com/oneclick/rubyinstaller2/releases/download/RubyInstaller-2.7.4-1/rubyinstaller-2.7.4-1-x64.7z"
+  },
+  "2.7.5": {
+    "x64": "https://github.com/oneclick/rubyinstaller2/releases/download/RubyInstaller-2.7.5-1/rubyinstaller-2.7.5-1-x64.7z"
+  },
+  "2.7.6": {
+    "x64": "https://github.com/oneclick/rubyinstaller2/releases/download/RubyInstaller-2.7.6-1/rubyinstaller-2.7.6-1-x64.7z"
+  },
+  "2.7.7": {
+    "x64": "https://github.com/oneclick/rubyinstaller2/releases/download/RubyInstaller-2.7.7-1/rubyinstaller-2.7.7-1-x64.7z"
+  },
+  "2.7.8": {
+    "x64": "https://github.com/oneclick/rubyinstaller2/releases/download/RubyInstaller-2.7.8-1/rubyinstaller-2.7.8-1-x64.7z"
+  },
+  "3.0.0": {
+    "x64": "https://github.com/oneclick/rubyinstaller2/releases/download/RubyInstaller-3.0.0-1/rubyinstaller-3.0.0-1-x64.7z"
+  },
+  "3.0.1": {
+    "x64": "https://github.com/oneclick/rubyinstaller2/releases/download/RubyInstaller-3.0.1-1/rubyinstaller-3.0.1-1-x64.7z"
+  },
+  "3.0.2": {
+    "x64": "https://github.com/oneclick/rubyinstaller2/releases/download/RubyInstaller-3.0.2-1/rubyinstaller-3.0.2-1-x64.7z"
+  },
+  "3.0.3": {
+    "x64": "https://github.com/oneclick/rubyinstaller2/releases/download/RubyInstaller-3.0.3-1/rubyinstaller-3.0.3-1-x64.7z"
+  },
+  "3.0.4": {
+    "x64": "https://github.com/oneclick/rubyinstaller2/releases/download/RubyInstaller-3.0.4-1/rubyinstaller-3.0.4-1-x64.7z"
+  },
+  "3.0.5": {
+    "x64": "https://github.com/oneclick/rubyinstaller2/releases/download/RubyInstaller-3.0.5-1/rubyinstaller-3.0.5-1-x64.7z"
+  },
+  "3.0.6": {
+    "x64": "https://github.com/oneclick/rubyinstaller2/releases/download/RubyInstaller-3.0.6-1/rubyinstaller-3.0.6-1-x64.7z"
+  },
+  "3.0.7": {
+    "x64": "https://github.com/oneclick/rubyinstaller2/releases/download/RubyInstaller-3.0.7-1/rubyinstaller-3.0.7-1-x64.7z"
+  },
+  "3.1.0": {
+    "x64": "https://github.com/oneclick/rubyinstaller2/releases/download/RubyInstaller-3.1.0-1/rubyinstaller-3.1.0-1-x64.7z"
+  },
+  "3.1.1": {
+    "x64": "https://github.com/oneclick/rubyinstaller2/releases/download/RubyInstaller-3.1.1-1/rubyinstaller-3.1.1-1-x64.7z"
+  },
+  "3.1.2": {
+    "x64": "https://github.com/oneclick/rubyinstaller2/releases/download/RubyInstaller-3.1.2-1/rubyinstaller-3.1.2-1-x64.7z"
+  },
+  "3.1.3": {
+    "x64": "https://github.com/oneclick/rubyinstaller2/releases/download/RubyInstaller-3.1.3-1/rubyinstaller-3.1.3-1-x64.7z"
+  },
+  "3.1.4": {
+    "x64": "https://github.com/oneclick/rubyinstaller2/releases/download/RubyInstaller-3.1.4-1/rubyinstaller-3.1.4-1-x64.7z"
+  },
+  "3.1.5": {
+    "x64": "https://github.com/oneclick/rubyinstaller2/releases/download/RubyInstaller-3.1.5-1/rubyinstaller-3.1.5-1-x64.7z"
+  },
+  "3.1.6": {
+    "x64": "https://github.com/oneclick/rubyinstaller2/releases/download/RubyInstaller-3.1.6-1/rubyinstaller-3.1.6-1-x64.7z"
+  },
+  "3.1.7": {
+    "x64": "https://github.com/oneclick/rubyinstaller2/releases/download/RubyInstaller-3.1.7-1/rubyinstaller-3.1.7-1-x64.7z"
+  },
+  "3.2.0": {
+    "x64": "https://github.com/oneclick/rubyinstaller2/releases/download/RubyInstaller-3.2.0-1/rubyinstaller-3.2.0-1-x64.7z"
+  },
+  "3.2.1": {
+    "x64": "https://github.com/oneclick/rubyinstaller2/releases/download/RubyInstaller-3.2.1-1/rubyinstaller-3.2.1-1-x64.7z"
+  },
+  "3.2.2": {
+    "x64": "https://github.com/oneclick/rubyinstaller2/releases/download/RubyInstaller-3.2.2-1/rubyinstaller-3.2.2-1-x64.7z"
+  },
+  "3.2.3": {
+    "x64": "https://github.com/oneclick/rubyinstaller2/releases/download/RubyInstaller-3.2.3-1/rubyinstaller-3.2.3-1-x64.7z"
+  },
+  "3.2.4": {
+    "x64": "https://github.com/oneclick/rubyinstaller2/releases/download/RubyInstaller-3.2.4-1/rubyinstaller-3.2.4-1-x64.7z"
+  },
+  "3.2.5": {
+    "x64": "https://github.com/oneclick/rubyinstaller2/releases/download/RubyInstaller-3.2.5-1/rubyinstaller-3.2.5-1-x64.7z"
+  },
+  "3.2.6": {
+    "x64": "https://github.com/oneclick/rubyinstaller2/releases/download/RubyInstaller-3.2.6-1/rubyinstaller-3.2.6-1-x64.7z"
+  },
+  "3.2.7": {
+    "x64": "https://github.com/oneclick/rubyinstaller2/releases/download/RubyInstaller-3.2.7-1/rubyinstaller-3.2.7-1-x64.7z"
+  },
+  "3.2.8": {
+    "x64": "https://github.com/oneclick/rubyinstaller2/releases/download/RubyInstaller-3.2.8-1/rubyinstaller-3.2.8-1-x64.7z"
+  },
+  "3.2.9": {
+    "x64": "https://github.com/oneclick/rubyinstaller2/releases/download/RubyInstaller-3.2.9-1/rubyinstaller-3.2.9-1-x64.7z"
+  },
+  "3.3.0": {
+    "x64": "https://github.com/oneclick/rubyinstaller2/releases/download/RubyInstaller-3.3.0-1/rubyinstaller-3.3.0-1-x64.7z"
+  },
+  "3.3.1": {
+    "x64": "https://github.com/oneclick/rubyinstaller2/releases/download/RubyInstaller-3.3.1-1/rubyinstaller-3.3.1-1-x64.7z"
+  },
+  "3.3.2": {
+    "x64": "https://github.com/oneclick/rubyinstaller2/releases/download/RubyInstaller-3.3.2-1/rubyinstaller-3.3.2-1-x64.7z"
+  },
+  "3.3.3": {
+    "x64": "https://github.com/oneclick/rubyinstaller2/releases/download/RubyInstaller-3.3.3-1/rubyinstaller-3.3.3-1-x64.7z"
+  },
+  "3.3.4": {
+    "x64": "https://github.com/oneclick/rubyinstaller2/releases/download/RubyInstaller-3.3.4-1/rubyinstaller-3.3.4-1-x64.7z"
+  },
+  "3.3.5": {
+    "x64": "https://github.com/oneclick/rubyinstaller2/releases/download/RubyInstaller-3.3.5-1/rubyinstaller-3.3.5-1-x64.7z"
+  },
+  "3.3.6": {
+    "x64": "https://github.com/oneclick/rubyinstaller2/releases/download/RubyInstaller-3.3.6-2/rubyinstaller-3.3.6-2-x64.7z"
+  },
+  "3.3.7": {
+    "x64": "https://github.com/oneclick/rubyinstaller2/releases/download/RubyInstaller-3.3.7-1/rubyinstaller-3.3.7-1-x64.7z"
+  },
+  "3.3.8": {
+    "x64": "https://github.com/oneclick/rubyinstaller2/releases/download/RubyInstaller-3.3.8-1/rubyinstaller-3.3.8-1-x64.7z"
+  },
+  "3.3.9": {
+    "x64": "https://github.com/oneclick/rubyinstaller2/releases/download/RubyInstaller-3.3.9-1/rubyinstaller-3.3.9-1-x64.7z"
+  },
+  "3.4.1": {
+    "arm64": "https://github.com/oneclick/rubyinstaller2/releases/download/RubyInstaller-3.4.1-2/rubyinstaller-3.4.1-2-arm.7z",
+    "x64": "https://github.com/oneclick/rubyinstaller2/releases/download/RubyInstaller-3.4.1-2/rubyinstaller-3.4.1-2-x64.7z"
+  },
+  "3.4.2": {
+    "arm64": "https://github.com/oneclick/rubyinstaller2/releases/download/RubyInstaller-3.4.2-1/rubyinstaller-3.4.2-1-arm.7z",
+    "x64": "https://github.com/oneclick/rubyinstaller2/releases/download/RubyInstaller-3.4.2-1/rubyinstaller-3.4.2-1-x64.7z"
+  },
+  "3.4.3": {
+    "arm64": "https://github.com/oneclick/rubyinstaller2/releases/download/RubyInstaller-3.4.3-1/rubyinstaller-3.4.3-1-arm.7z",
+    "x64": "https://github.com/oneclick/rubyinstaller2/releases/download/RubyInstaller-3.4.3-1/rubyinstaller-3.4.3-1-x64.7z"
+  },
+  "3.4.4": {
+    "arm64": "https://github.com/oneclick/rubyinstaller2/releases/download/RubyInstaller-3.4.4-2/rubyinstaller-3.4.4-2-arm.7z",
+    "x64": "https://github.com/oneclick/rubyinstaller2/releases/download/RubyInstaller-3.4.4-2/rubyinstaller-3.4.4-2-x64.7z"
+  },
+  "3.4.5": {
+    "arm64": "https://github.com/oneclick/rubyinstaller2/releases/download/RubyInstaller-3.4.5-1/rubyinstaller-3.4.5-1-arm.7z",
+    "x64": "https://github.com/oneclick/rubyinstaller2/releases/download/RubyInstaller-3.4.5-1/rubyinstaller-3.4.5-1-x64.7z"
+  },
+  "head": {
+    "arm64": "https://github.com/oneclick/rubyinstaller2/releases/download/rubyinstaller-head/rubyinstaller-head-arm.7z",
+    "x64": "https://github.com/oneclick/rubyinstaller2/releases/download/rubyinstaller-head/rubyinstaller-head-x64.7z"
+  },
+  "mingw": {
+    "x64": "https://github.com/MSP-Greg/ruby-loco/releases/download/ruby-master/ruby-mingw.7z"
+  },
+  "mswin": {
+    "x64": "https://github.com/MSP-Greg/ruby-loco/releases/download/ruby-master/ruby-mswin.7z"
+  },
+  "ucrt": {
+    "x64": "https://github.com/MSP-Greg/ruby-loco/releases/download/ruby-master/ruby-ucrt.7z"
+  }
+}

windows.js

@@ -0,0 +1,238 @@
+// 7z arguments
+//   -aoa overwrite existing, -bd disable progress indicator
+
+const fs = require('fs')
+const os = require('os')
+const path = require('path')
+const cp = require('child_process')
+const core = require('@actions/core')
+const exec = require('@actions/exec')
+const tc = require('@actions/tool-cache')
+const common = require('./common')
+const rubyInstallerVersions = require('./windows-versions.json')
+const toolchainVersions = require('./windows-toolchain-versions.json')
+
+export function getAvailableVersions(_platform, engine) {
+  if (engine === 'ruby') {
+    return Object.keys(rubyInstallerVersions).filter(version => os.arch() in rubyInstallerVersions[version])
+  } else {
+    return undefined
+  }
+}
+
+export async function install(platform, engine, version) {
+  const url = rubyInstallerVersions[version][os.arch()]
+
+  if (!url.endsWith('.7z')) {
+    throw new Error(`URL should end in .7z: ${url}`)
+  }
+  const base = path.posix.basename(url, '.7z')
+
+  let rubyPrefix, inToolCache
+  if (common.shouldUseToolCache(engine, version)) {
+    inToolCache = common.toolCacheFind(engine, version)
+    if (inToolCache) {
+      rubyPrefix = inToolCache
+    } else {
+      rubyPrefix = common.getToolCacheRubyPrefix(platform, engine, version)
+    }
+  } else {
+    rubyPrefix = `${common.drive}:\\${base}`
+  }
+
+  if (!inToolCache) {
+    await downloadAndExtract(engine, version, url, base, rubyPrefix);
+  }
+
+  const paths = [`${rubyPrefix}\\bin`]
+  const windowsToolchain = core.getInput('windows-toolchain')
+  if (windowsToolchain === 'none') {
+    common.setupPath(paths)
+    return rubyPrefix
+  }
+
+  const toolchainUrl = toolchainVersions[version][os.arch()]
+
+  // Examples:
+  // - DevKit-mingw64-64-4.7.2-20130224-1432-sfx.exe
+  // - msys2-clangarm64.7z
+  // - vcpkg-x64-windows.7z
+  const toolchainName = path.posix.basename(toolchainUrl).split('-')[0].toLowerCase()
+
+  if (toolchainName === 'msys2') {
+    paths.push(...await installMSYS2(toolchainUrl, rubyPrefix))
+  } else {
+    if (toolchainName === 'vcpkg') {
+      paths.push(...await installVCPKG(toolchainUrl))
+    } else if (toolchainName === 'devkit') {
+      paths.push(...await installMSYS1(toolchainUrl))
+    } else {
+      throw new Error(`Unknown toolchain type: ${toolchainUrl}`)
+    }
+
+    // Install msys2 for other rubies to provide better command line tools
+    paths.push(...await installMSYS2(toolchainVersions['head'][os.arch()]))
+  }
+
+  common.setupPath(paths)
+  return rubyPrefix
+}
+
+async function downloadAndExtract(engine, version, url, base, rubyPrefix) {
+  const downloadPath = await common.measure('Downloading Ruby', async () => {
+    console.log(url)
+    return await tc.downloadTool(url)
+  })
+
+  const extractPath = process.env.RUNNER_TEMP
+  await common.measure('Extracting  Ruby', async () =>
+    // -xr extract but exclude share\doc files
+    exec.exec('7z', ['x', downloadPath, '-bd', `-xr!${base}\\share\\doc`, `-o${extractPath}`], { silent: true }))
+
+  const parentDir = path.dirname(rubyPrefix)
+  if (!fs.existsSync(parentDir)) {
+    fs.mkdirSync(parentDir, { recursive: true })
+  }
+
+  const extractedPath = path.join(extractPath, base)
+  if (extractedPath[0] === rubyPrefix[0]) {
+    fs.renameSync(extractedPath, rubyPrefix)
+  } else {
+    fs.symlinkSync(extractedPath, rubyPrefix, 'junction')
+  }
+
+  if (common.shouldUseToolCache(engine, version)) {
+    common.createToolCacheCompleteFile(rubyPrefix)
+  }
+}
+
+export async function installJRubyTools() {
+  return await installMSYS2(toolchainVersions['head'][os.arch()])
+}
+
+async function installMSYS2(url, rubyPrefix = process.env.RUNNER_TEMP) {
+  const downloadPath = await common.measure('Downloading msys2 build tools', async () => {
+    console.log(url)
+    return await tc.downloadTool(url)
+  })
+
+  const extractPath = path.join(process.env.RUNNER_TEMP, 'msys64')
+  await common.measure('Extracting  msys2 build tools', async () =>
+    exec.exec('7z', ['x', downloadPath, '-aoa', '-bd', `-o${extractPath}`], { silent: true }))
+
+  // https://github.com/oneclick/rubyinstaller2/blob/HEAD/lib/ruby_installer/build/msys2_installation.rb
+  //
+  // ri2 searches for msys64 in the following order:
+  // - ENV["MSYS2_PATH"]
+  // - File.join(RbConfig::TOPDIR, "msys64")
+  // - File.join(File.dirname(RbConfig::TOPDIR), "msys64")
+  // - "C:\msys64"
+  // - ...
+  //
+  // The first option ENV["MSYS2_PATH"] is only supported in ruby >=3.0.7.
+  // Therefore we use the second option to avoid conflict with existing "C:\msys64"
+  const msys2Path = path.join(rubyPrefix, 'msys64')
+  if (extractPath !== msys2Path) {
+    fs.symlinkSync(extractPath, msys2Path, 'junction')
+  }
+
+  const ridk = `${rubyPrefix}\\bin\\ridk.cmd`
+  if (fs.existsSync(ridk)) {
+    await common.measure('Setting up ridk environment', async () => exportCommandEnv(`set "MAKE=make" && "${ridk}" enable`))
+  }
+
+  // Examples:
+  // - msys2-clangarm64.7z
+  // - msys2-ucrt64-gcc@14.7z
+  // - msys2-mingw64-gcc@14-openssl@1.1.7z
+  const msys2Type = path.posix.basename(url).split(/[-.]/)[1]
+  return [`${msys2Path}\\${msys2Type}\\bin`, `${msys2Path}\\usr\\bin`]
+}
+
+async function installMSYS1(url) {
+  const certFile = [
+    'C:\\Program Files\\Git\\mingw64\\etc\\ssl\\cert.pem',
+    'C:\\Program Files\\Git\\mingw64\\ssl\\cert.pem',
+  ].find(file => fs.existsSync(file))
+  if (certFile === undefined) {
+    throw new Error("Cannot find Git's cert file")
+  }
+
+  const downloadPath = await common.measure('Downloading msys1 build tools', async () => {
+    console.log(url)
+    return await tc.downloadTool(url)
+  })
+
+  const msys1Path = `${common.drive}:\\DevKit64`
+  await common.measure('Extracting  msys1 build tools', async () =>
+    exec.exec('7z', ['x', downloadPath, '-aoa', '-bd', `-o${msys1Path}`], { silent: true }))
+
+  await common.measure('Setting up DevKit environment', async () => {
+    // ssl dlls cause issues with msys1 Rubies
+    const sys32 = 'C:\\Windows\\System32\\'
+    const badFiles = [`${sys32}libcrypto-1_1-x64.dll`, `${sys32}libssl-1_1-x64.dll`]
+    const existing = badFiles.filter((dll) => fs.existsSync(dll))
+    if (existing.length > 0) {
+      core.warning(`Renaming ${existing.join(' and ')} to avoid dll resolution conflicts on Ruby < 2.4`)
+      existing.forEach(dll => fs.renameSync(dll, `${dll}_`))
+    }
+
+    exportEnv({
+      CC: 'gcc',
+      CPP: 'cpp',
+      CXX: 'g++',
+      MAKE: 'make',
+      RI_DEVKIT: msys1Path,
+      SSL_CERT_FILE: certFile
+    })
+  })
+
+  return [`${msys1Path}\\mingw\\x86_64-w64-mingw32\\bin`, `${msys1Path}\\mingw\\bin`, `${msys1Path}\\bin`]
+}
+
+/* Sets MSVC environment for use in Actions
+ *   allows steps to run without running vcvars*.bat, also for PowerShell
+ *   this assumes a single Visual Studio version being available in the Windows images */
+async function installVCPKG(url) {
+  const downloadPath = await common.measure('Downloading mswin vcpkg packages', async () => {
+    console.log(url)
+    return await tc.downloadTool(url)
+  })
+
+  const extractPath = process.env.VCPKG_INSTALLATION_ROOT
+  await common.measure('Extracting  mswin vcpkg packages', async () =>
+    exec.exec('7z', ['x', downloadPath, '-aoa', '-bd', `-o${extractPath}`], { silent: true }))
+
+  return await common.measure('Setting up MSVC environment', async () => {
+    const cmd = 'vswhere -latest -property installationPath'
+    const vcVarsBat = os.arch() === 'arm64' ? 'vcvarsarm64.bat' : 'vcvars64.bat'
+    const vcVars = `${cp.execSync(cmd).toString().trim()}\\VC\\Auxiliary\\Build\\${vcVarsBat}`
+
+    if (!fs.existsSync(vcVars)) {
+      throw new Error(`Missing vcVars file: ${vcVars}`)
+    }
+
+    return exportCommandEnv(`set "MAKE=nmake" && "${vcVars}"`)
+  })
+}
+
+// Run a cmd command, export its environment, and return new paths
+function exportCommandEnv(command) {
+  const cmd = `cmd.exe /s /c "${command} >NUL && "${process.execPath}" -e console.log(JSON.stringify(process.env))"`
+  const env = JSON.parse(cp.execSync(cmd).toString())
+
+  const paths = env.Path.replace(`${path.delimiter}${process.env.Path}`, '').split(path.delimiter)
+  delete env.Path
+
+  exportEnv(env)
+  return paths
+}
+
+function exportEnv(env) {
+  for (const [k, v] of Object.entries(env)) {
+    if (process.env[k] !== v) {
+      console.log(`${k}=${v}`)
+      core.exportVariable(k, v)
+    }
+  }
+}