Print the OpenSSL version

* Which uses a newer OpenSSL for Ruby 2.3 on Ubuntu and macOS.

.eslintrc.json

@@ -10,7 +10,8 @@
         "SharedArrayBuffer": "readonly"
     },
     "parserOptions": {
-        "ecmaVersion": 2018
+        "ecmaVersion": 2018,
+        "sourceType": "module"
     },
     "rules": {
     }

.github/workflows/test.yml

@@ -1,17 +1,45 @@
 name: Test this action
-on: [push]
+on:
+  push:
+    paths-ignore:
+    - README.md
 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-16.04, ubuntu-18.04, macos-latest, windows-latest ]
+        # Use various version syntaxes here for testing
+        ruby: [ .ruby-version, 2.3, ruby-2.4, 2.5, ruby-2.6.5, 2.7.0, jruby, truffleruby ]
+        exclude:
+        - os: windows-latest
+          ruby: 2.3
+        - os: windows-latest
+          ruby: jruby
+        - os: windows-latest
+          ruby: truffleruby
     runs-on: ${{ matrix.os }}
     steps:
     - uses: actions/checkout@v2
     - uses: ./
       with:
         ruby-version: ${{ matrix.ruby }}
-    - run: ruby -v
-    - run: ruby -ropen-uri -e 'puts open("https://rubygems.org/") { |f| f.read(2014) }'
+    - run: ruby --version
+    - run: ridk version
+      if: matrix.os == 'windows-latest'
+    - run: ruby -ropenssl -e 'puts OpenSSL::OPENSSL_LIBRARY_VERSION'
+    - name: OpenSSL test
+      run: ruby -ropen-uri -e 'puts open(%{https://rubygems.org/}) { |f| f.read(1024) }'
+    - name: C extension test
+      run: gem install json --no-document
+    - name: Check that Bundler is installed
+      run: bundle --version
+    - name: Check that Bundler works
+      run: bundle install
+
+  lint:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v2
+    - run: yarn install
+    - run: yarn run lint

.ruby-version

@@ -0,0 +1 @@
+ruby-2.6.5

Gemfile

@@ -0,0 +1,5 @@
+# Used for testing
+source 'https://rubygems.org'
+
+gem "path"
+gem "json"

README.md

@@ -1,16 +1,41 @@
-# use-ruby
+# use-ruby-action
 
-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.
+### Supported Versions
 
-The action works for the `ubuntu-16.04`, `ubuntu-18.04` and `macos-latest` GitHub-hosted runners.  
-`windows-latest` is not yet supported.
+This action currently supports these versions of MRI, JRuby and TruffleRuby:
 
-The prebuilt rubies are generated by https://github.com/eregon/ruby-install-builder.
+| Interpreter | Versions |
+| ----------- | -------- |
+| Ruby | 2.3.0 - 2.3.8, 2.4.0 - 2.4.9, 2.5.0 - 2.5.7, 2.6.0 - 2.6.5, 2.7.0 |
+| JRuby | 9.2.9.0 |
+| TruffleRuby  | 19.3.0, 19.3.1 |
+
+See [versions.json](https://github.com/eregon/ruby-install-builder/blob/metadata/versions.json)
+for the always up-to-date list of available Ruby versions.
+
+Note that Ruby 2.3 and the OpenSSL version it needs (1.0.2) are both end-of-life,
+which means Ruby 2.3 is unmaintained and considered insecure.
+On Windows, Ruby 2.4 uses OpenSSL 1.0.2, which is no longer maintained.
+
+### Supported Platforms
+
+The action works for all [GitHub-hosted runners](https://help.github.com/en/actions/automating-your-workflow-with-github-actions/virtual-environments-for-github-hosted-runners).
+
+| Operating System | Versions |
+| ----------- | -------- |
+| Ubuntu  | `ubuntu-latest` (= `ubuntu-18.04`), `ubuntu-16.04` |
+| macOS   | `macos-latest` |
+| Windows | `windows-latest` |
+
+Ruby 2.3, JRuby and TruffleRuby are not yet supported on `windows-latest`.
+
+The prebuilt rubies are generated by [eregon/ruby-install-builder](https://github.com/eregon/ruby-install-builder)
+and on Windows by [RubyInstaller2](https://github.com/oneclick/rubyinstaller2).
 
 ## Usage
 
@@ -24,14 +49,16 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - uses: actions/checkout@v2
-    - uses: eregon/use-ruby-action@master
+    - uses: eregon/use-ruby-action@v1
       with:
-        ruby-version: ruby-2.6
+        ruby-version: 2.6
     - run: ruby -v
 ```
 
 ### Matrix
 
+This matrix tests all stable releases of MRI, JRuby and TruffleRuby on Ubuntu and macOS.
+
 ```yaml
 name: My workflow
 on: [push]
@@ -41,11 +68,11 @@ jobs:
       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 ]
+        ruby: [ 2.4, 2.5, 2.6, 2.7, jruby, truffleruby ]
     runs-on: ${{ matrix.os }}
     steps:
     - uses: actions/checkout@v2
-    - uses: eregon/use-ruby-action@master
+    - uses: eregon/use-ruby-action@v1
       with:
         ruby-version: ${{ matrix.ruby }}
     - run: ruby -v
@@ -57,36 +84,47 @@ jobs:
 * short version like `2.6`, automatically using the latest release matching that version (`2.6.5`)
 * version only like `2.6.5`, assumes MRI for the engine
 * engine only like `truffleruby`, uses the latest stable release of that implementation
+* `.ruby-version` (also the default value) reads from the project's `.ruby-version` file
 
-### All Stable Versions
+### Bundler
 
-With that, we can test on all stable releases of MRI, JRuby and TruffleRuby with:
+Currently, Bundler is guaranteed to be installed for all versions.
+If the Ruby ships with Bundler (Ruby >= 2.6), that version is used.
+Otherwise (Ruby < 2.6), Bundler 1 is installed when that Ruby was built.
+
+### Caching `bundle install`
+
+You can cache the installed gems with these two steps:
 
 ```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: actions/cache@v1
       with:
-        ruby-version: ${{ matrix.ruby }}
-    - run: ruby -v
+        path: vendor/bundle
+        key: bundle-use-ruby-${{ matrix.os }}-${{ matrix.ruby }}-${{ hashFiles('**/Gemfile.lock') }}
+        restore-keys: |
+          bundle-use-ruby-${{ matrix.os }}-${{ matrix.ruby }}-
+    - name: Bundle install
+      run: |
+        bundle config path vendor/bundle
+        bundle install --jobs 4 --retry 3
 ```
 
-## Efficiency
+When using a single job with a Ruby version, replace `${{ matrix.ruby }}` with the Ruby version.  
+When using `.ruby-version`, replace `${{ matrix.ruby }}` with `${{ hashFiles('.ruby-version') }}`.
 
-It takes about 5 seconds to setup the given Ruby.
+This uses the [cache action](https://github.com/actions/cache).
+The code above is a more complete version of the [Ruby - Gem example](https://github.com/actions/cache/blob/master/examples.md#ruby---gem).
+Make sure to include `use-ruby` in the `key` to avoid conflicting with previous caches.
 
 ## Limitations
 
-* 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.
+
+## Versioning
+
+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.
+
+## Credits
+
+Most of the Windows logic is from https://github.com/MSP-Greg/actions-ruby by MSP-Greg.

action.yml

@@ -1,13 +1,13 @@
 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 if unset.'
+    default: '.ruby-version'
 outputs:
   ruby-prefix:
     description: 'The prefix of the installed ruby'

dist/index.js

@@ -36,6 +36,8 @@ module.exports =
 /******/ 		// Load entry module and return exports
 /******/ 		return __webpack_require__(104);
 /******/ 	};
+/******/ 	// initialize runtime
+/******/ 	runtime(__webpack_require__);
 /******/
 /******/ 	// run startup
 /******/ 	return startup();
@@ -1383,39 +1385,53 @@ const core = __webpack_require__(470)
 const io = __webpack_require__(1)
 const tc = __webpack_require__(533)
 const axios = __webpack_require__(53)
+const windows = __webpack_require__(664)
 
+const builderReleaseTag = 'builds-newer-openssl'
 const releasesURL = 'https://github.com/eregon/ruby-install-builder/releases'
 const metadataURL = 'https://raw.githubusercontent.com/eregon/ruby-install-builder/metadata'
 
 async function run() {
   try {
+    const platform = getVirtualEnvironmentName()
     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`)
+    let rubyPrefix
+    if (platform === 'windows-latest') {
+      rubyPrefix = await windows.downloadExtractAndSetPATH(ruby)
+    } else {
+      if (ruby.startsWith('jruby')) {
+        // Workaround for https://github.com/actions/virtual-environments/issues/242
+        core.exportVariable('CLASSPATH', '')
+      }
+      rubyPrefix = await downloadAndExtract(platform, ruby)
+      core.addPath(`${rubyPrefix}/bin`)
+    }
     core.setOutput('ruby-prefix', rubyPrefix)
   } catch (error) {
     core.setFailed(error.message)
   }
 }
 
-async function getLatestReleaseTag() {
-  const response = await axios.get(`${metadataURL}/latest_release.tag`)
-  return response.data.trim()
+async function downloadAndExtract(platform, ruby) {
+  const rubiesDir = `${process.env.HOME}/.rubies`
+  await io.mkdirP(rubiesDir)
+
+  const url = `${releasesURL}/download/${builderReleaseTag}/${ruby}-${platform}.tar.gz`
+  console.log(url)
+
+  const downloadPath = await tc.downloadTool(url)
+  await tc.extractTar(downloadPath, rubiesDir)
+
+  return `${rubiesDir}/${ruby}`
 }
 
 async function getRubyEngineAndVersion(rubyVersion) {
+  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`)
+  }
+
   let engine, version
   if (rubyVersion.match(/^\d+/)) { // X.Y.Z => ruby-X.Y.Z
     engine = 'ruby'
@@ -1431,16 +1447,19 @@ async function getRubyEngineAndVersion(rubyVersion) {
   const stableVersions = response.data
   const engineVersions = stableVersions[engine]
   if (!engineVersions) {
-    throw new Error(`Unknown engine ${engine} (${rubyVersion})`)
+    throw new Error(`Unknown engine ${engine} (input: ${rubyVersion})`)
   }
 
   if (!engineVersions.includes(version)) {
-    engineVersions.reverse() // inplace!
-    let found = engineVersions.find(v => v.startsWith(version))
+    const latestToFirstVersion = engineVersions.slice().reverse()
+    const found = latestToFirstVersion.find(v => v.startsWith(version))
     if (found) {
       version = found
     } else {
-      throw new Error(`Unknown version ${version} (${rubyVersion})`)
+      throw new Error(`Unknown version ${version} for ${engine}
+        input: ${rubyVersion}
+        available versions for ${engine}: ${engineVersions.join(', ')}
+        File an issue at https://github.com/eregon/use-ruby-action/issues if would like support for a new version`)
     }
   }
 
@@ -6437,6 +6456,84 @@ function plural(ms, n, name) {
 }
 
 
+/***/ }),
+
+/***/ 664:
+/***/ (function(__unusedmodule, __webpack_exports__, __webpack_require__) {
+
+"use strict";
+__webpack_require__.r(__webpack_exports__);
+/* harmony export (binding) */ __webpack_require__.d(__webpack_exports__, "downloadExtractAndSetPATH", function() { return downloadExtractAndSetPATH; });
+// Most of this logic is from
+// https://github.com/MSP-Greg/actions-ruby/blob/master/lib/main.js
+
+const fs = __webpack_require__(747)
+const core = __webpack_require__(470)
+const exec = __webpack_require__(986)
+const tc = __webpack_require__(533)
+
+const releasesURL = 'https://github.com/oneclick/rubyinstaller2/releases'
+
+async function downloadExtractAndSetPATH(ruby) {
+  const version = ruby.split('-', 2)[1]
+  if (!ruby.startsWith('ruby-') || version.startsWith('2.3')) {
+    throw new Error(`Only ruby >= 2.4 is supported on Windows currently (input: ${ruby})`)
+  }
+  const tag = `RubyInstaller-${version}-1`
+  const base = `${tag.toLowerCase()}-x64`
+
+  const url = `${releasesURL}/download/${tag}/${base}.7z`
+  console.log(url)
+
+  const downloadPath = await tc.downloadTool(url)
+  await exec.exec(`7z x ${downloadPath} -xr!${base}\\share\\doc -oC:\\`)
+  const rubyPrefix = `C:\\${base}`
+
+  const msys2 = await linkMSYS2()
+  const newPath = setupPath(msys2, rubyPrefix)
+  core.exportVariable('PATH', newPath)
+
+  if (!fs.existsSync(`${rubyPrefix}\\bin\\bundle.cmd`)) {
+    await exec.exec(`${rubyPrefix}\\bin\\gem install bundler -v "~> 1" --no-document`)
+  }
+
+  return rubyPrefix
+}
+
+async function linkMSYS2() {
+  const toolCacheVersions = tc.findAllVersions('Ruby')
+  toolCacheVersions.sort()
+  if (toolCacheVersions.length == 0) {
+    throw new Error('Could not find MSYS2 in the toolcache')
+  }
+  const latestVersion = toolCacheVersions.slice(-1)[0]
+  const latestHostedRuby = tc.find('Ruby', latestVersion)
+
+  const hostedMSYS2 = `${latestHostedRuby}\\msys64`
+  const msys2 = 'C:\\msys64'
+  await exec.exec(`cmd /c mklink /D ${msys2} ${hostedMSYS2}`)
+  return msys2
+}
+
+function setupPath(msys2, rubyPrefix) {
+  let path = process.env['PATH'].split(';')
+
+  // Remove conflicting dev tools from PATH
+  path = path.filter(e => !e.match(/\b(Chocolatey|CMake|mingw64|OpenSSL|Strawberry)\b/))
+
+  // Remove default Ruby in PATH
+  path = path.filter(e => !e.match(/\bRuby\b/))
+
+  // Add MSYS2 in PATH
+  path.unshift(`${msys2}\\mingw64\\bin`, `${msys2}\\usr\\bin`)
+
+  // Add the downloaded Ruby in PATH
+  path.unshift(`${rubyPrefix}\\bin`)
+
+  return path.join(';')
+}
+
+
 /***/ }),
 
 /***/ 669:
@@ -8759,4 +8856,31 @@ exports.exec = exec;
 
 /***/ })
 
-/******/ });
+/******/ },
+/******/ function(__webpack_require__) { // webpackRuntimeModules
+/******/ 	"use strict";
+/******/ 
+/******/ 	/* webpack/runtime/make namespace object */
+/******/ 	!function() {
+/******/ 		// define __esModule on exports
+/******/ 		__webpack_require__.r = function(exports) {
+/******/ 			if(typeof Symbol !== 'undefined' && Symbol.toStringTag) {
+/******/ 				Object.defineProperty(exports, Symbol.toStringTag, { value: 'Module' });
+/******/ 			}
+/******/ 			Object.defineProperty(exports, '__esModule', { value: true });
+/******/ 		};
+/******/ 	}();
+/******/ 	
+/******/ 	/* webpack/runtime/define property getter */
+/******/ 	!function() {
+/******/ 		// define getter function for harmony exports
+/******/ 		var hasOwnProperty = Object.prototype.hasOwnProperty;
+/******/ 		__webpack_require__.d = function(exports, name, getter) {
+/******/ 			if(!hasOwnProperty.call(exports, name)) {
+/******/ 				Object.defineProperty(exports, name, { enumerable: true, get: getter });
+/******/ 			}
+/******/ 		};
+/******/ 	}();
+/******/ 	
+/******/ }
+);

index.js

@@ -4,39 +4,53 @@ const core = require('@actions/core')
 const io = require('@actions/io')
 const tc = require('@actions/tool-cache')
 const axios = require('axios')
+const windows = require('./windows')
 
+const builderReleaseTag = 'builds-newer-openssl'
 const releasesURL = 'https://github.com/eregon/ruby-install-builder/releases'
 const metadataURL = 'https://raw.githubusercontent.com/eregon/ruby-install-builder/metadata'
 
 async function run() {
   try {
+    const platform = getVirtualEnvironmentName()
     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`)
+    let rubyPrefix
+    if (platform === 'windows-latest') {
+      rubyPrefix = await windows.downloadExtractAndSetPATH(ruby)
+    } else {
+      if (ruby.startsWith('jruby')) {
+        // Workaround for https://github.com/actions/virtual-environments/issues/242
+        core.exportVariable('CLASSPATH', '')
+      }
+      rubyPrefix = await downloadAndExtract(platform, ruby)
+      core.addPath(`${rubyPrefix}/bin`)
+    }
     core.setOutput('ruby-prefix', rubyPrefix)
   } catch (error) {
     core.setFailed(error.message)
   }
 }
 
-async function getLatestReleaseTag() {
-  const response = await axios.get(`${metadataURL}/latest_release.tag`)
-  return response.data.trim()
+async function downloadAndExtract(platform, ruby) {
+  const rubiesDir = `${process.env.HOME}/.rubies`
+  await io.mkdirP(rubiesDir)
+
+  const url = `${releasesURL}/download/${builderReleaseTag}/${ruby}-${platform}.tar.gz`
+  console.log(url)
+
+  const downloadPath = await tc.downloadTool(url)
+  await tc.extractTar(downloadPath, rubiesDir)
+
+  return `${rubiesDir}/${ruby}`
 }
 
 async function getRubyEngineAndVersion(rubyVersion) {
+  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`)
+  }
+
   let engine, version
   if (rubyVersion.match(/^\d+/)) { // X.Y.Z => ruby-X.Y.Z
     engine = 'ruby'
@@ -52,16 +66,19 @@ async function getRubyEngineAndVersion(rubyVersion) {
   const stableVersions = response.data
   const engineVersions = stableVersions[engine]
   if (!engineVersions) {
-    throw new Error(`Unknown engine ${engine} (${rubyVersion})`)
+    throw new Error(`Unknown engine ${engine} (input: ${rubyVersion})`)
   }
 
   if (!engineVersions.includes(version)) {
-    engineVersions.reverse() // inplace!
-    let found = engineVersions.find(v => v.startsWith(version))
+    const latestToFirstVersion = engineVersions.slice().reverse()
+    const found = latestToFirstVersion.find(v => v.startsWith(version))
     if (found) {
       version = found
     } else {
-      throw new Error(`Unknown version ${version} (${rubyVersion})`)
+      throw new Error(`Unknown version ${version} for ${engine}
+        input: ${rubyVersion}
+        available versions for ${engine}: ${engineVersions.join(', ')}
+        File an issue at https://github.com/eregon/use-ruby-action/issues if would like support for a new version`)
     }
   }
 

package.json

@@ -1,10 +1,10 @@
 {
   "name": "use-ruby-action",
   "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",
   "scripts": {
-    "lint": "eslint index.js",
+    "lint": "eslint *.js",
     "package": "ncc build index.js -o dist"
   },
   "repository": {

windows.js

@@ -0,0 +1,68 @@
+// Most of this logic is from
+// https://github.com/MSP-Greg/actions-ruby/blob/master/lib/main.js
+
+const fs = require('fs')
+const core = require('@actions/core')
+const exec = require('@actions/exec')
+const tc = require('@actions/tool-cache')
+
+const releasesURL = 'https://github.com/oneclick/rubyinstaller2/releases'
+
+export async function downloadExtractAndSetPATH(ruby) {
+  const version = ruby.split('-', 2)[1]
+  if (!ruby.startsWith('ruby-') || version.startsWith('2.3')) {
+    throw new Error(`Only ruby >= 2.4 is supported on Windows currently (input: ${ruby})`)
+  }
+  const tag = `RubyInstaller-${version}-1`
+  const base = `${tag.toLowerCase()}-x64`
+
+  const url = `${releasesURL}/download/${tag}/${base}.7z`
+  console.log(url)
+
+  const downloadPath = await tc.downloadTool(url)
+  await exec.exec(`7z x ${downloadPath} -xr!${base}\\share\\doc -oC:\\`)
+  const rubyPrefix = `C:\\${base}`
+
+  const msys2 = await linkMSYS2()
+  const newPath = setupPath(msys2, rubyPrefix)
+  core.exportVariable('PATH', newPath)
+
+  if (!fs.existsSync(`${rubyPrefix}\\bin\\bundle.cmd`)) {
+    await exec.exec(`${rubyPrefix}\\bin\\gem install bundler -v "~> 1" --no-document`)
+  }
+
+  return rubyPrefix
+}
+
+async function linkMSYS2() {
+  const toolCacheVersions = tc.findAllVersions('Ruby')
+  toolCacheVersions.sort()
+  if (toolCacheVersions.length == 0) {
+    throw new Error('Could not find MSYS2 in the toolcache')
+  }
+  const latestVersion = toolCacheVersions.slice(-1)[0]
+  const latestHostedRuby = tc.find('Ruby', latestVersion)
+
+  const hostedMSYS2 = `${latestHostedRuby}\\msys64`
+  const msys2 = 'C:\\msys64'
+  await exec.exec(`cmd /c mklink /D ${msys2} ${hostedMSYS2}`)
+  return msys2
+}
+
+function setupPath(msys2, rubyPrefix) {
+  let path = process.env['PATH'].split(';')
+
+  // Remove conflicting dev tools from PATH
+  path = path.filter(e => !e.match(/\b(Chocolatey|CMake|mingw64|OpenSSL|Strawberry)\b/))
+
+  // Remove default Ruby in PATH
+  path = path.filter(e => !e.match(/\bRuby\b/))
+
+  // Add MSYS2 in PATH
+  path.unshift(`${msys2}\\mingw64\\bin`, `${msys2}\\usr\\bin`)
+
+  // Add the downloaded Ruby in PATH
+  path.unshift(`${rubyPrefix}\\bin`)
+
+  return path.join(';')
+}