Add test checking using an exact Bundler version works

* So the mapping to `engine-version` versions is clearer.

.github/workflows/test.yml

@@ -102,6 +102,17 @@ jobs:
       if: startsWith(matrix.os, 'windows') && startsWith(matrix.ruby, 'jruby')
       run: gem install sassc -N
 
+  testExactBundlerVersion:
+    name: "Test with an exact Bundler version"
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v2
+    - uses: ./
+      with:
+        ruby-version: 2.6
+        bundler: 2.1.4
+    - run: bundle --version | grep -F 2.1.4
+
   lint:
     runs-on: ubuntu-20.04
     steps:

README.md

@@ -14,9 +14,9 @@ This action currently supports these versions of MRI, JRuby and TruffleRuby:
 
 | Interpreter | Versions |
 | ----------- | -------- |
-| Ruby | 2.1.9, 2.2, 2.3.0 - 2.3.8, 2.4.0 - 2.4.10, 2.5.0 - 2.5.8, 2.6.0 - 2.6.6, 2.7.2, head, debug, mingw, mswin |
+| `ruby` | 2.1.9, 2.2, 2.3.0 - 2.3.8, 2.4.0 - 2.4.10, 2.5.0 - 2.5.8, 2.6.0 - 2.6.6, 2.7.2, head, debug, mingw, mswin |
-| JRuby | 9.1.17.0, 9.2.9.0 - 9.2.13.0, head |
+| `jruby` | 9.1.17.0, 9.2.9.0 - 9.2.13.0, head |
-| TruffleRuby | 19.3.0 - 20.3.0, head |
+| `truffleruby` | 19.3.0 - 20.3.0, head |
 
 `ruby-debug` is the same as `ruby-head` but with assertions enabled (`-DRUBY_DEBUG=1`).  
 On Windows, `mingw` and `mswin` are `ruby-head` builds using the MSYS2/MinGW and the MSVC toolchains respectively.

action.yml

@@ -11,7 +11,7 @@ inputs:
     default: 'default'
   bundler:
     description: |
-      The version of Bundler to install. Either 'none', 1, 2, 'latest' or 'Gemfile.lock'.
+      The version of Bundler to install. Either 'none', 'latest', 'Gemfile.lock', or a version number (e.g., 1, 2, 2.1.4).
       For 'Gemfile.lock', the version is determined based on the BUNDLED WITH section from the file Gemfile.lock, $BUNDLE_GEMFILE.lock or gems.locked.
       Defaults to 'Gemfile.lock' if the file exists and 'latest' otherwise.
     required: false

common.js

@@ -40,6 +40,25 @@ export function isStableVersion(rubyVersion) {
   return /^\d+(\.\d+)*$/.test(rubyVersion)
 }
 
+export function isBundler2Default(engine, rubyVersion) {
+  if (engine === 'ruby') {
+    return isHeadVersion(rubyVersion) || floatVersion(rubyVersion) >= 2.7
+  } else if (engine === 'truffleruby') {
+    return isHeadVersion(rubyVersion)
+  } else {
+    return false
+  }
+}
+
+export function floatVersion(rubyVersion) {
+  const match = rubyVersion.match(/^\d+\.\d+/)
+  if (match) {
+    return parseFloat(match[0])
+  } else {
+    return 0.0
+  }
+}
+
 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')
@@ -77,7 +96,7 @@ export function getVirtualEnvironmentName() {
   throw new Error(`Unknown ImageOS ${imageOS}`)
 }
 
-export function shouldExtractInToolCache(engine, version) {
+export function shouldUseToolCache(engine, version) {
   return engine === 'ruby' && !isHeadVersion(version)
 }
 
@@ -99,6 +118,11 @@ export function getToolCacheRubyPrefix(platform, version) {
   return path.join(toolCache, 'Ruby', version, 'x64')
 }
 
+export function createToolCacheCompleteFile(toolCacheRubyPrefix) {
+  const completeFile = `${toolCacheRubyPrefix}.complete`
+  fs.writeFileSync(completeFile, '')
+}
+
 // convert windows path like C:\Users\runneradmin to /c/Users/runneradmin
 export function win2nix(path) {
   if (/^[A-Z]:/i.test(path)) {

dist/index.js

@@ -27712,18 +27712,32 @@ async function install(platform, engine, version) {
   }
   const base = url.slice(url.lastIndexOf('/') + 1, url.length - '.7z'.length)
 
-  let rubyPrefix
+  let rubyPrefix, inToolCache
-  if (common.shouldExtractInToolCache(engine, version)) {
+  if (common.shouldUseToolCache(engine, version)) {
-    rubyPrefix = common.getToolCacheRubyPrefix(platform, version)
+    inToolCache = tc.find('Ruby', version)
+    if (inToolCache) {
+      rubyPrefix = inToolCache
+    } else {
+      rubyPrefix = common.getToolCacheRubyPrefix(platform, version)
+    }
   } else {
     rubyPrefix = `${drive}:\\${base}`
   }
-  const parentDir = path.dirname(rubyPrefix)
 
   let toolchainPaths = (version === 'mswin') ? await setupMSWin() : await setupMingw(version)
 
   common.setupPath([`${rubyPrefix}\\bin`, ...toolchainPaths])
 
+  if (!inToolCache) {
+    await downloadAndExtract(engine, version, url, base, rubyPrefix);
+  }
+
+  return rubyPrefix
+}
+
+async function downloadAndExtract(engine, version, url, base, rubyPrefix) {
+  const parentDir = path.dirname(rubyPrefix)
+
   const downloadPath = await common.measure('Downloading Ruby', async () => {
     console.log(url)
     return await tc.downloadTool(url)
@@ -27736,7 +27750,9 @@ async function install(platform, engine, version) {
     await io.mv(path.join(parentDir, base), rubyPrefix)
   }
 
-  return rubyPrefix
+  if (common.shouldUseToolCache(engine, version)) {
+    common.createToolCacheCompleteFile(rubyPrefix)
+  }
 }
 
 async function setupMingw(version) {
@@ -32098,10 +32114,13 @@ __webpack_require__.r(__webpack_exports__);
 /* harmony export (binding) */ __webpack_require__.d(__webpack_exports__, "measure", function() { return measure; });
 /* harmony export (binding) */ __webpack_require__.d(__webpack_exports__, "isHeadVersion", function() { return isHeadVersion; });
 /* harmony export (binding) */ __webpack_require__.d(__webpack_exports__, "isStableVersion", function() { return isStableVersion; });
+/* harmony export (binding) */ __webpack_require__.d(__webpack_exports__, "isBundler2Default", function() { return isBundler2Default; });
+/* harmony export (binding) */ __webpack_require__.d(__webpack_exports__, "floatVersion", function() { return floatVersion; });
 /* harmony export (binding) */ __webpack_require__.d(__webpack_exports__, "hashFile", function() { return hashFile; });
 /* harmony export (binding) */ __webpack_require__.d(__webpack_exports__, "getVirtualEnvironmentName", function() { return getVirtualEnvironmentName; });
-/* harmony export (binding) */ __webpack_require__.d(__webpack_exports__, "shouldExtractInToolCache", function() { return shouldExtractInToolCache; });
+/* harmony export (binding) */ __webpack_require__.d(__webpack_exports__, "shouldUseToolCache", function() { return shouldUseToolCache; });
 /* harmony export (binding) */ __webpack_require__.d(__webpack_exports__, "getToolCacheRubyPrefix", function() { return getToolCacheRubyPrefix; });
+/* harmony export (binding) */ __webpack_require__.d(__webpack_exports__, "createToolCacheCompleteFile", function() { return createToolCacheCompleteFile; });
 /* harmony export (binding) */ __webpack_require__.d(__webpack_exports__, "win2nix", function() { return win2nix; });
 /* harmony export (binding) */ __webpack_require__.d(__webpack_exports__, "setupPath", function() { return setupPath; });
 const os = __webpack_require__(87)
@@ -32146,6 +32165,25 @@ function isStableVersion(rubyVersion) {
   return /^\d+(\.\d+)*$/.test(rubyVersion)
 }
 
+function isBundler2Default(engine, rubyVersion) {
+  if (engine === 'ruby') {
+    return isHeadVersion(rubyVersion) || floatVersion(rubyVersion) >= 2.7
+  } else if (engine === 'truffleruby') {
+    return isHeadVersion(rubyVersion)
+  } else {
+    return false
+  }
+}
+
+function floatVersion(rubyVersion) {
+  const match = rubyVersion.match(/^\d+\.\d+/)
+  if (match) {
+    return parseFloat(match[0])
+  } else {
+    return 0.0
+  }
+}
+
 async function hashFile(file) {
   // See https://github.com/actions/runner/blob/master/src/Misc/expressionFunc/hashFiles/src/hashFiles.ts
   const hash = crypto.createHash('sha256')
@@ -32183,7 +32221,7 @@ function getVirtualEnvironmentName() {
   throw new Error(`Unknown ImageOS ${imageOS}`)
 }
 
-function shouldExtractInToolCache(engine, version) {
+function shouldUseToolCache(engine, version) {
   return engine === 'ruby' && !isHeadVersion(version)
 }
 
@@ -32205,6 +32243,11 @@ function getToolCacheRubyPrefix(platform, version) {
   return path.join(toolCache, 'Ruby', version, 'x64')
 }
 
+function createToolCacheCompleteFile(toolCacheRubyPrefix) {
+  const completeFile = `${toolCacheRubyPrefix}.complete`
+  fs.writeFileSync(completeFile, '')
+}
+
 // convert windows path like C:\Users\runneradmin to /c/Users/runneradmin
 function win2nix(path) {
   if (/^[A-Z]:/i.test(path)) {
@@ -44540,7 +44583,7 @@ function getVersions(platform) {
       "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",
       "2.6.0", "2.6.1", "2.6.2", "2.6.3", "2.6.4", "2.6.5", "2.6.6",
       "2.7.0", "2.7.1", "2.7.2",
-      "3.0.0-preview1",
+      "3.0.0-preview1", "3.0.0-preview2",
       "head", "debug",
     ],
     "jruby": [
@@ -51235,12 +51278,12 @@ async function setupRuby(options = {}) {
   if (inputs['bundler'] !== 'none') {
     const [gemfile, lockFile] = detectGemfiles()
 
-    await common.measure('Installing Bundler', async () =>
+    const bundlerVersion = await common.measure('Installing Bundler', async () =>
       installBundler(inputs['bundler'], lockFile, platform, rubyPrefix, engine, version))
 
     if (inputs['bundler-cache'] === 'true') {
       await common.measure('bundle install', async () =>
-          bundleInstall(gemfile, lockFile, platform, engine, version))
+          bundleInstall(gemfile, lockFile, platform, engine, version, bundlerVersion))
     }
   }
 
@@ -51353,9 +51396,8 @@ function readBundledWithFromGemfileLock(lockFile) {
       const nextLine = lines[bundledWithLine+1]
       if (nextLine && /^\d+/.test(nextLine.trim())) {
         const bundlerVersion = nextLine.trim()
-        const majorVersion = bundlerVersion.match(/^\d+/)[0]
+        console.log(`Using Bundler ${bundlerVersion} from ${lockFile} BUNDLED WITH ${bundlerVersion}`)
-        console.log(`Using Bundler ${majorVersion} from ${lockFile} BUNDLED WITH ${bundlerVersion}`)
+        return bundlerVersion
-        return majorVersion
       }
     }
   }
@@ -51383,7 +51425,7 @@ async function installBundler(bundlerVersionInput, lockFile, platform, rubyPrefi
     throw new Error(`Cannot parse bundler input: ${bundlerVersion}`)
   }
 
-  if (engine === 'ruby' && rubyVersion.match(/^2\.[12]/)) {
+  if (engine === 'ruby' && rubyVersion.match(/^2\.[012]/)) {
     console.log('Bundler 2 requires Ruby 2.3+, using Bundler 1 on Ruby <= 2.2')
     bundlerVersion = '1'
   } else if (engine === 'ruby' && rubyVersion.startsWith('2.3')) {
@@ -51394,40 +51436,48 @@ async function installBundler(bundlerVersionInput, lockFile, platform, rubyPrefi
     bundlerVersion = '1'
   }
 
-  if ((engine === 'ruby' || engine === 'truffleruby') && common.isHeadVersion(rubyVersion) && bundlerVersion === '2') {
+  if (common.isHeadVersion(rubyVersion) && common.isBundler2Default(engine, rubyVersion) && bundlerVersion.startsWith('2')) {
     console.log(`Using Bundler 2 shipped with ${engine}-${rubyVersion}`)
-  } else if (engine === 'truffleruby' && !common.isHeadVersion(rubyVersion) && bundlerVersion === '1') {
+  } else if (engine === 'truffleruby' && !common.isHeadVersion(rubyVersion) && bundlerVersion.startsWith('1')) {
     console.log(`Using Bundler 1 shipped with ${engine}`)
   } else {
     const gem = path.join(rubyPrefix, 'bin', 'gem')
     await exec.exec(gem, ['install', 'bundler', '-v', `~> ${bundlerVersion}`, '--no-document'])
   }
 
-  core.exportVariable('BUNDLER_VERSION', bundlerVersion)
+  return bundlerVersion
 }
 
-async function bundleInstall(gemfile, lockFile, platform, engine, version) {
+async function bundleInstall(gemfile, lockFile, platform, engine, rubyVersion, bundlerVersion) {
   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 path = 'vendor/bundle'
 
-  await exec.exec('bundle', ['config', '--local', 'path', path])
+  await exec.exec('bundle', ['config', '--local', 'path', path], envOptions)
 
   if (fs.existsSync(lockFile)) {
-    await exec.exec('bundle', ['config', '--local', 'deployment', 'true'])
+    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'])
+    await exec.exec('bundle', ['lock'], envOptions)
   }
 
   // cache key
   const paths = [path]
-  const baseKey = await computeBaseKey(platform, engine, version, lockFile)
+  const baseKey = await computeBaseKey(platform, engine, rubyVersion, lockFile)
   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}-`]
@@ -52910,7 +52960,6 @@ __webpack_require__.r(__webpack_exports__);
 /* harmony export (binding) */ __webpack_require__.d(__webpack_exports__, "install", function() { return install; });
 const os = __webpack_require__(87)
 const path = __webpack_require__(622)
-const core = __webpack_require__(186)
 const exec = __webpack_require__(514)
 const io = __webpack_require__(436)
 const tc = __webpack_require__(188)
@@ -52927,24 +52976,33 @@ function getAvailableVersions(platform, engine) {
 }
 
 async function install(platform, engine, version) {
-  return await downloadAndExtract(platform, engine, version)
+  let rubyPrefix, inToolCache
-}
+  if (common.shouldUseToolCache(engine, version)) {
-
+    inToolCache = tc.find('Ruby', version)
-async function downloadAndExtract(platform, engine, version) {
+    if (inToolCache) {
-  let rubyPrefix
+      rubyPrefix = inToolCache
-  if (common.shouldExtractInToolCache(engine, version)) {
+    } else {
-    rubyPrefix = common.getToolCacheRubyPrefix(platform, version)
+      rubyPrefix = common.getToolCacheRubyPrefix(platform, version)
+    }
   } else if (windows) {
     rubyPrefix = path.join(`${common.drive}:`, `${engine}-${version}`)
   } else {
     rubyPrefix = path.join(os.homedir(), '.rubies', `${engine}-${version}`)
   }
 
-  const parentDir = path.dirname(rubyPrefix)
-
   // Set the PATH now, so the MSYS2 'tar' is in Path on Windows
   common.setupPath([path.join(rubyPrefix, 'bin')])
 
+  if (!inToolCache) {
+    await downloadAndExtract(platform, engine, version, rubyPrefix);
+  }
+
+  return rubyPrefix
+}
+
+async function downloadAndExtract(platform, engine, version, rubyPrefix) {
+  const parentDir = path.dirname(rubyPrefix)
+
   await io.rmRF(rubyPrefix)
   await io.mkdirP(parentDir)
 
@@ -52957,13 +53015,15 @@ async function downloadAndExtract(platform, engine, version) {
   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) ])
+      await exec.exec('tar', ['-xz', '-C', common.win2nix(parentDir), '-f', common.win2nix(downloadPath)])
     } else {
-      await exec.exec('tar', [ '-xz', '-C', parentDir, '-f',  downloadPath ])
+      await exec.exec('tar', ['-xz', '-C', parentDir, '-f', downloadPath])
     }
   })
 
-  return rubyPrefix
+  if (common.shouldUseToolCache(engine, version)) {
+    common.createToolCacheCompleteFile(rubyPrefix)
+  }
 }
 
 function getDownloadURL(platform, engine, version) {

index.js

@@ -63,12 +63,12 @@ export async function setupRuby(options = {}) {
   if (inputs['bundler'] !== 'none') {
     const [gemfile, lockFile] = detectGemfiles()
 
-    await common.measure('Installing Bundler', async () =>
+    const bundlerVersion = await common.measure('Installing Bundler', async () =>
       installBundler(inputs['bundler'], lockFile, platform, rubyPrefix, engine, version))
 
     if (inputs['bundler-cache'] === 'true') {
       await common.measure('bundle install', async () =>
-          bundleInstall(gemfile, lockFile, platform, engine, version))
+          bundleInstall(gemfile, lockFile, platform, engine, version, bundlerVersion))
     }
   }
 
@@ -181,9 +181,8 @@ function readBundledWithFromGemfileLock(lockFile) {
       const nextLine = lines[bundledWithLine+1]
       if (nextLine && /^\d+/.test(nextLine.trim())) {
         const bundlerVersion = nextLine.trim()
-        const majorVersion = bundlerVersion.match(/^\d+/)[0]
+        console.log(`Using Bundler ${bundlerVersion} from ${lockFile} BUNDLED WITH ${bundlerVersion}`)
-        console.log(`Using Bundler ${majorVersion} from ${lockFile} BUNDLED WITH ${bundlerVersion}`)
+        return bundlerVersion
-        return majorVersion
       }
     }
   }
@@ -211,7 +210,7 @@ async function installBundler(bundlerVersionInput, lockFile, platform, rubyPrefi
     throw new Error(`Cannot parse bundler input: ${bundlerVersion}`)
   }
 
-  if (engine === 'ruby' && rubyVersion.match(/^2\.[12]/)) {
+  if (engine === 'ruby' && rubyVersion.match(/^2\.[012]/)) {
     console.log('Bundler 2 requires Ruby 2.3+, using Bundler 1 on Ruby <= 2.2')
     bundlerVersion = '1'
   } else if (engine === 'ruby' && rubyVersion.startsWith('2.3')) {
@@ -222,40 +221,48 @@ async function installBundler(bundlerVersionInput, lockFile, platform, rubyPrefi
     bundlerVersion = '1'
   }
 
-  if ((engine === 'ruby' || engine === 'truffleruby') && common.isHeadVersion(rubyVersion) && bundlerVersion === '2') {
+  if (common.isHeadVersion(rubyVersion) && common.isBundler2Default(engine, rubyVersion) && bundlerVersion.startsWith('2')) {
     console.log(`Using Bundler 2 shipped with ${engine}-${rubyVersion}`)
-  } else if (engine === 'truffleruby' && !common.isHeadVersion(rubyVersion) && bundlerVersion === '1') {
+  } else if (engine === 'truffleruby' && !common.isHeadVersion(rubyVersion) && bundlerVersion.startsWith('1')) {
     console.log(`Using Bundler 1 shipped with ${engine}`)
   } else {
     const gem = path.join(rubyPrefix, 'bin', 'gem')
     await exec.exec(gem, ['install', 'bundler', '-v', `~> ${bundlerVersion}`, '--no-document'])
   }
 
-  core.exportVariable('BUNDLER_VERSION', bundlerVersion)
+  return bundlerVersion
 }
 
-async function bundleInstall(gemfile, lockFile, platform, engine, version) {
+async function bundleInstall(gemfile, lockFile, platform, engine, rubyVersion, bundlerVersion) {
   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 path = 'vendor/bundle'
 
-  await exec.exec('bundle', ['config', '--local', 'path', path])
+  await exec.exec('bundle', ['config', '--local', 'path', path], envOptions)
 
   if (fs.existsSync(lockFile)) {
-    await exec.exec('bundle', ['config', '--local', 'deployment', 'true'])
+    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'])
+    await exec.exec('bundle', ['lock'], envOptions)
   }
 
   // cache key
   const paths = [path]
-  const baseKey = await computeBaseKey(platform, engine, version, lockFile)
+  const baseKey = await computeBaseKey(platform, engine, rubyVersion, lockFile)
   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}-`]

ruby-builder-versions.js

@@ -8,7 +8,7 @@ export function getVersions(platform) {
       "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",
       "2.6.0", "2.6.1", "2.6.2", "2.6.3", "2.6.4", "2.6.5", "2.6.6",
       "2.7.0", "2.7.1", "2.7.2",
-      "3.0.0-preview1",
+      "3.0.0-preview1", "3.0.0-preview2",
       "head", "debug",
     ],
     "jruby": [

ruby-builder.js

@@ -1,6 +1,5 @@
 const os = require('os')
 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')
@@ -17,24 +16,33 @@ export function getAvailableVersions(platform, engine) {
 }
 
 export async function install(platform, engine, version) {
-  return await downloadAndExtract(platform, engine, version)
+  let rubyPrefix, inToolCache
-}
+  if (common.shouldUseToolCache(engine, version)) {
-
+    inToolCache = tc.find('Ruby', version)
-async function downloadAndExtract(platform, engine, version) {
+    if (inToolCache) {
-  let rubyPrefix
+      rubyPrefix = inToolCache
-  if (common.shouldExtractInToolCache(engine, version)) {
+    } else {
-    rubyPrefix = common.getToolCacheRubyPrefix(platform, version)
+      rubyPrefix = common.getToolCacheRubyPrefix(platform, version)
+    }
   } else if (windows) {
     rubyPrefix = path.join(`${common.drive}:`, `${engine}-${version}`)
   } else {
     rubyPrefix = path.join(os.homedir(), '.rubies', `${engine}-${version}`)
   }
 
-  const parentDir = path.dirname(rubyPrefix)
-
   // Set the PATH now, so the MSYS2 'tar' is in Path on Windows
   common.setupPath([path.join(rubyPrefix, 'bin')])
 
+  if (!inToolCache) {
+    await downloadAndExtract(platform, engine, version, rubyPrefix);
+  }
+
+  return rubyPrefix
+}
+
+async function downloadAndExtract(platform, engine, version, rubyPrefix) {
+  const parentDir = path.dirname(rubyPrefix)
+
   await io.rmRF(rubyPrefix)
   await io.mkdirP(parentDir)
 
@@ -47,13 +55,15 @@ async function downloadAndExtract(platform, engine, version) {
   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) ])
+      await exec.exec('tar', ['-xz', '-C', common.win2nix(parentDir), '-f', common.win2nix(downloadPath)])
     } else {
-      await exec.exec('tar', [ '-xz', '-C', parentDir, '-f',  downloadPath ])
+      await exec.exec('tar', ['-xz', '-C', parentDir, '-f', downloadPath])
     }
   })
 
-  return rubyPrefix
+  if (common.shouldUseToolCache(engine, version)) {
+    common.createToolCacheCompleteFile(rubyPrefix)
+  }
 }
 
 function getDownloadURL(platform, engine, version) {

windows.js

@@ -36,18 +36,32 @@ export async function install(platform, engine, version) {
   }
   const base = url.slice(url.lastIndexOf('/') + 1, url.length - '.7z'.length)
 
-  let rubyPrefix
+  let rubyPrefix, inToolCache
-  if (common.shouldExtractInToolCache(engine, version)) {
+  if (common.shouldUseToolCache(engine, version)) {
-    rubyPrefix = common.getToolCacheRubyPrefix(platform, version)
+    inToolCache = tc.find('Ruby', version)
+    if (inToolCache) {
+      rubyPrefix = inToolCache
+    } else {
+      rubyPrefix = common.getToolCacheRubyPrefix(platform, version)
+    }
   } else {
     rubyPrefix = `${drive}:\\${base}`
   }
-  const parentDir = path.dirname(rubyPrefix)
 
   let toolchainPaths = (version === 'mswin') ? await setupMSWin() : await setupMingw(version)
 
   common.setupPath([`${rubyPrefix}\\bin`, ...toolchainPaths])
 
+  if (!inToolCache) {
+    await downloadAndExtract(engine, version, url, base, rubyPrefix);
+  }
+
+  return rubyPrefix
+}
+
+async function downloadAndExtract(engine, version, url, base, rubyPrefix) {
+  const parentDir = path.dirname(rubyPrefix)
+
   const downloadPath = await common.measure('Downloading Ruby', async () => {
     console.log(url)
     return await tc.downloadTool(url)
@@ -60,7 +74,9 @@ export async function install(platform, engine, version) {
     await io.mv(path.join(parentDir, base), rubyPrefix)
   }
 
-  return rubyPrefix
+  if (common.shouldUseToolCache(engine, version)) {
+    common.createToolCacheCompleteFile(rubyPrefix)
+  }
 }
 
 async function setupMingw(version) {