Automatically install libxml2-dev libxslt-dev on TruffleRuby if needed

* This is a special case, because TruffleRuby needs an extra system
  dependency that other Rubies do not, and GitHub runners do not have
  these packages installed by default, while TravisCI has them.

.github/workflows/test.yml

@@ -108,8 +108,8 @@ jobs:
     - uses: ./
       with:
         ruby-version: 2.6
-        bundler: 2.1.4
+        bundler: 2.2.3
-    - run: bundle --version | grep -F "Bundler version 2.1.4"
+    - run: bundle --version | grep -F "Bundler version 2.2.3"
 
   testDependencyOnBundler1:
     name: "Test gemfile depending on Bundler 1"
@@ -142,6 +142,19 @@ jobs:
           bundler-cache: true
       - run: bundle exec rails --version
 
+  testTruffleRubyNokogiri:
+    name: "Test installing a Gemfile with nokogiri on TruffleRuby"
+    runs-on: ubuntu-latest
+    env:
+      BUNDLE_GEMFILE: gemfiles/nokogiri.gemfile
+    steps:
+      - uses: actions/checkout@v2
+      - uses: ./
+        with:
+          ruby-version: truffleruby-head
+          bundler-cache: true
+      - run: bundle list | grep nokogiri
+
   lint:
     runs-on: ubuntu-20.04
     steps:

bundler.js

@@ -0,0 +1,196 @@
+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')
+
+// 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 && /^\d+/.test(nextLine.trim())) {
+        const bundlerVersion = nextLine.trim()
+        console.log(`Using Bundler ${bundlerVersion} from ${lockFile} BUNDLED WITH ${bundlerVersion}`)
+        return bundlerVersion
+      }
+    }
+  }
+  return null
+}
+
+async function afterLockFile(lockFile, platform, engine) {
+  if (engine === 'truffleruby' && platform.startsWith('ubuntu-')) {
+    const contents = fs.readFileSync(lockFile, 'utf8')
+    if (contents.includes('nokogiri')) {
+      await common.measure('Installing libxml2-dev libxslt-dev, required to install nokogiri on TruffleRuby', async () =>
+          exec.exec('sudo', ['apt-get', '-yqq', 'install', 'libxml2-dev', 'libxslt-dev'], { silent: true }))
+    }
+  }
+}
+
+export async function installBundler(bundlerVersionInput, lockFile, platform, rubyPrefix, engine, rubyVersion) {
+  let bundlerVersion = bundlerVersionInput
+
+  if (bundlerVersion === 'default' || bundlerVersion === 'Gemfile.lock') {
+    bundlerVersion = readBundledWithFromGemfileLock(lockFile)
+
+    if (!bundlerVersion) {
+      bundlerVersion = 'latest'
+    }
+  }
+
+  if (bundlerVersion === 'latest') {
+    bundlerVersion = '2'
+  }
+
+  if (/^\d+/.test(bundlerVersion)) {
+    // OK
+  } else {
+    throw new Error(`Cannot parse bundler input: ${bundlerVersion}`)
+  }
+
+  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')) {
+    console.log('Ruby 2.3 has a bug with Bundler 2 (https://github.com/rubygems/rubygems/issues/3570), using Bundler 1 instead on Ruby 2.3')
+    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'
+  }
+
+  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.startsWith('1')) {
+    console.log(`Using Bundler 1 shipped with ${engine}`)
+  } else {
+    const gem = path.join(rubyPrefix, 'bin', 'gem')
+    const bundlerVersionConstraint = bundlerVersion.match(/^\d+\.\d+\.\d+/) ? bundlerVersion : `~> ${bundlerVersion}`
+    await exec.exec(gem, ['install', 'bundler', '-v', bundlerVersionConstraint, '--no-document'])
+  }
+
+  return bundlerVersion
+}
+
+export async function bundleInstall(gemfile, lockFile, platform, engine, rubyVersion, bundlerVersion) {
+  if (gemfile === null) {
+    console.log('Could not determine gemfile path, skipping "bundle install" and caching')
+    return false
+  }
+
+  let envOptions = {}
+  if (bundlerVersion.startsWith('1') && common.isBundler2Default(engine, rubyVersion)) {
+    // If Bundler 1 is specified on Rubies which ship with Bundler 2,
+    // we need to specify which Bundler version to use explicitly until the lockfile exists.
+    console.log(`Setting BUNDLER_VERSION=${bundlerVersion} for "bundle config|lock" commands below to ensure Bundler 1 is used`)
+    envOptions = { env: { ...process.env, BUNDLER_VERSION: bundlerVersion } }
+  }
+
+  // config
+  const cachePath = 'vendor/bundle'
+  // An absolute path, so it is reliably under $PWD/vendor/bundle, and not relative to the gemfile's directory
+  const bundleCachePath = path.join(process.cwd(), cachePath)
+
+  await exec.exec('bundle', ['config', '--local', 'path', bundleCachePath], envOptions)
+
+  if (fs.existsSync(lockFile)) {
+    await exec.exec('bundle', ['config', '--local', 'deployment', 'true'], envOptions)
+  } else {
+    // Generate the lockfile so we can use it to compute the cache key.
+    // This will also automatically pick up the latest gem versions compatible with the Gemfile.
+    await exec.exec('bundle', ['lock'], envOptions)
+  }
+
+  await afterLockFile(lockFile, platform, engine)
+
+  // cache key
+  const paths = [cachePath]
+  const baseKey = await computeBaseKey(platform, engine, rubyVersion, lockFile)
+  const key = `${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}-`]
+  console.log(`Cache key: ${key}`)
+
+  // restore cache & install
+  let cachedKey = null
+  try {
+    cachedKey = await cache.restoreCache(paths, 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: ${cachedKey}`)
+  }
+
+  // Always run 'bundle install' to list the gems
+  await exec.exec('bundle', ['install', '--jobs', '4'])
+
+  // @actions/cache only allows to save for non-existing keys
+  if (cachedKey !== key) {
+    if (cachedKey) { // existing cache but Gemfile.lock differs, clean old gems
+      await exec.exec('bundle', ['clean'])
+    }
+
+    // Error handling from https://github.com/actions/cache/blob/master/src/save.ts
+    console.log('Saving cache')
+    try {
+      await cache.saveCache(paths, key)
+    } catch (error) {
+      if (error.name === cache.ValidationError.name) {
+        throw error;
+      } else if (error.name === cache.ReserveCacheError.name) {
+        core.info(error.message);
+      } else {
+        core.info(`[warning]${error.message}`)
+      }
+    }
+  }
+
+  return true
+}
+
+async function computeBaseKey(platform, engine, version, lockFile) {
+  let key = `setup-ruby-bundler-cache-v3-${platform}-${engine}-${version}`
+
+  if (engine !== 'jruby' && common.isHeadVersion(version)) {
+    let revision = '';
+    await exec.exec('ruby', ['-e', 'print RUBY_REVISION'], {
+      silent: true,
+      listeners: {
+        stdout: (data) => {
+          revision += data.toString();
+        }
+      }
+    });
+    key += `-revision-${revision}`
+  }
+
+  key += `-${lockFile}`
+  return key
+}

common.js

@@ -19,8 +19,10 @@ export function partition(string, separator) {
   return [string.slice(0, i), string.slice(i + separator.length, string.length)]
 }
 
+let inGroup = false
+
 export async function measure(name, block) {
-  return await core.group(name, async () => {
+  const body = async () => {
     const start = performance.now()
     try {
       return await block()
@@ -29,7 +31,20 @@ export async function measure(name, block) {
       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
+    }
+  }
 }
 
 export function isHeadVersion(rubyVersion) {

dist/index.js

@@ -3029,7 +3029,7 @@ var os = __webpack_require__(87);
 var stream = __webpack_require__(413);
 var fs = __webpack_require__(747);
 var util = __webpack_require__(669);
-var crypto = __webpack_require__(373);
+var crypto = __webpack_require__(417);
 var events = __webpack_require__(614);
 var coreTracing = __webpack_require__(175);
 var coreLro = __webpack_require__(94);
@@ -23220,7 +23220,7 @@ Object.defineProperty(exports, "__esModule", {
 });
 exports.default = void 0;
 
-var _crypto = _interopRequireDefault(__webpack_require__(373));
+var _crypto = _interopRequireDefault(__webpack_require__(417));
 
 function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
 
@@ -28783,7 +28783,7 @@ Object.defineProperty(exports, "__esModule", { value: true });
 const core = __importStar(__webpack_require__(186));
 const http_client_1 = __webpack_require__(320);
 const auth_1 = __webpack_require__(93);
-const crypto = __importStar(__webpack_require__(373));
+const crypto = __importStar(__webpack_require__(417));
 const fs = __importStar(__webpack_require__(747));
 const url_1 = __webpack_require__(835);
 const utils = __importStar(__webpack_require__(518));
@@ -32589,12 +32589,7 @@ exports.Store = Store;
 /* 370 */,
 /* 371 */,
 /* 372 */,
-/* 373 */
+/* 373 */,
-/***/ (function(module) {
-
-module.exports = require("crypto");
-
-/***/ }),
 /* 374 */,
 /* 375 */,
 /* 376 */
@@ -32748,7 +32743,7 @@ Object.defineProperty(exports, "__esModule", {
 });
 exports.default = void 0;
 
-var _crypto = _interopRequireDefault(__webpack_require__(373));
+var _crypto = _interopRequireDefault(__webpack_require__(417));
 
 function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
 
@@ -32800,7 +32795,7 @@ const path = __webpack_require__(622)
 const fs = __webpack_require__(747)
 const util = __webpack_require__(669)
 const stream = __webpack_require__(413)
-const crypto = __webpack_require__(373)
+const crypto = __webpack_require__(417)
 const core = __webpack_require__(186)
 const { performance } = __webpack_require__(630)
 
@@ -32816,8 +32811,10 @@ function partition(string, separator) {
   return [string.slice(0, i), string.slice(i + separator.length, string.length)]
 }
 
+let inGroup = false
+
 async function measure(name, block) {
-  return await core.group(name, async () => {
+  const body = async () => {
     const start = performance.now()
     try {
       return await block()
@@ -32826,7 +32823,20 @@ async function measure(name, block) {
       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
+    }
+  }
 }
 
 function isHeadVersion(rubyVersion) {
@@ -33198,67 +33208,7 @@ function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { de
 /* 417 */
 /***/ (function(module) {
 
-"use strict";
+module.exports = require("crypto");
-
-module.exports = balanced;
-function balanced(a, b, str) {
-  if (a instanceof RegExp) a = maybeMatch(a, str);
-  if (b instanceof RegExp) b = maybeMatch(b, str);
-
-  var r = range(a, b, str);
-
-  return r && {
-    start: r[0],
-    end: r[1],
-    pre: str.slice(0, r[0]),
-    body: str.slice(r[0] + a.length, r[1]),
-    post: str.slice(r[1] + b.length)
-  };
-}
-
-function maybeMatch(reg, str) {
-  var m = str.match(reg);
-  return m ? m[0] : null;
-}
-
-balanced.range = range;
-function range(a, b, str) {
-  var begs, beg, left, right, result;
-  var ai = str.indexOf(a);
-  var bi = str.indexOf(b, ai + 1);
-  var i = ai;
-
-  if (ai >= 0 && bi > 0) {
-    begs = [];
-    left = str.length;
-
-    while (i >= 0 && !result) {
-      if (i == ai) {
-        begs.push(i);
-        ai = str.indexOf(a, i + 1);
-      } else if (begs.length == 1) {
-        result = [ begs.pop(), bi ];
-      } else {
-        beg = begs.pop();
-        if (beg < left) {
-          left = beg;
-          right = bi;
-        }
-
-        bi = str.indexOf(b, i + 1);
-      }
-
-      i = ai < bi && ai >= 0 ? ai : bi;
-    }
-
-    if (begs.length) {
-      result = [ left, right ];
-    }
-  }
-
-  return result;
-}
-
 
 /***/ }),
 /* 418 */
@@ -44576,7 +44526,213 @@ module.exports = require("net");
 /* 638 */,
 /* 639 */,
 /* 640 */,
-/* 641 */,
+/* 641 */
+/***/ (function(__unusedmodule, __webpack_exports__, __webpack_require__) {
+
+"use strict";
+__webpack_require__.r(__webpack_exports__);
+/* harmony export (binding) */ __webpack_require__.d(__webpack_exports__, "detectGemfiles", function() { return detectGemfiles; });
+/* harmony export (binding) */ __webpack_require__.d(__webpack_exports__, "installBundler", function() { return installBundler; });
+/* harmony export (binding) */ __webpack_require__.d(__webpack_exports__, "bundleInstall", function() { return bundleInstall; });
+const fs = __webpack_require__(747)
+const path = __webpack_require__(622)
+const core = __webpack_require__(186)
+const exec = __webpack_require__(514)
+const cache = __webpack_require__(799)
+const common = __webpack_require__(390)
+
+// The returned gemfile is guaranteed to exist, the lockfile might not exist
+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 && /^\d+/.test(nextLine.trim())) {
+        const bundlerVersion = nextLine.trim()
+        console.log(`Using Bundler ${bundlerVersion} from ${lockFile} BUNDLED WITH ${bundlerVersion}`)
+        return bundlerVersion
+      }
+    }
+  }
+  return null
+}
+
+async function afterLockFile(lockFile, platform, engine) {
+  if (engine === 'truffleruby' && platform.startsWith('ubuntu-')) {
+    const contents = fs.readFileSync(lockFile, 'utf8')
+    if (contents.includes('nokogiri')) {
+      await common.measure('Installing libxml2-dev libxslt-dev, required to install nokogiri on TruffleRuby', async () =>
+          exec.exec('sudo', ['apt-get', '-yqq', 'install', 'libxml2-dev', 'libxslt-dev'], { silent: true }))
+    }
+  }
+}
+
+async function installBundler(bundlerVersionInput, lockFile, platform, rubyPrefix, engine, rubyVersion) {
+  let bundlerVersion = bundlerVersionInput
+
+  if (bundlerVersion === 'default' || bundlerVersion === 'Gemfile.lock') {
+    bundlerVersion = readBundledWithFromGemfileLock(lockFile)
+
+    if (!bundlerVersion) {
+      bundlerVersion = 'latest'
+    }
+  }
+
+  if (bundlerVersion === 'latest') {
+    bundlerVersion = '2'
+  }
+
+  if (/^\d+/.test(bundlerVersion)) {
+    // OK
+  } else {
+    throw new Error(`Cannot parse bundler input: ${bundlerVersion}`)
+  }
+
+  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')) {
+    console.log('Ruby 2.3 has a bug with Bundler 2 (https://github.com/rubygems/rubygems/issues/3570), using Bundler 1 instead on Ruby 2.3')
+    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'
+  }
+
+  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.startsWith('1')) {
+    console.log(`Using Bundler 1 shipped with ${engine}`)
+  } else {
+    const gem = path.join(rubyPrefix, 'bin', 'gem')
+    const bundlerVersionConstraint = bundlerVersion.match(/^\d+\.\d+\.\d+/) ? bundlerVersion : `~> ${bundlerVersion}`
+    await exec.exec(gem, ['install', 'bundler', '-v', bundlerVersionConstraint, '--no-document'])
+  }
+
+  return bundlerVersion
+}
+
+async function bundleInstall(gemfile, lockFile, platform, engine, rubyVersion, bundlerVersion) {
+  if (gemfile === null) {
+    console.log('Could not determine gemfile path, skipping "bundle install" and caching')
+    return false
+  }
+
+  let envOptions = {}
+  if (bundlerVersion.startsWith('1') && common.isBundler2Default(engine, rubyVersion)) {
+    // If Bundler 1 is specified on Rubies which ship with Bundler 2,
+    // we need to specify which Bundler version to use explicitly until the lockfile exists.
+    console.log(`Setting BUNDLER_VERSION=${bundlerVersion} for "bundle config|lock" commands below to ensure Bundler 1 is used`)
+    envOptions = { env: { ...process.env, BUNDLER_VERSION: bundlerVersion } }
+  }
+
+  // config
+  const cachePath = 'vendor/bundle'
+  // An absolute path, so it is reliably under $PWD/vendor/bundle, and not relative to the gemfile's directory
+  const bundleCachePath = path.join(process.cwd(), cachePath)
+
+  await exec.exec('bundle', ['config', '--local', 'path', bundleCachePath], envOptions)
+
+  if (fs.existsSync(lockFile)) {
+    await exec.exec('bundle', ['config', '--local', 'deployment', 'true'], envOptions)
+  } else {
+    // Generate the lockfile so we can use it to compute the cache key.
+    // This will also automatically pick up the latest gem versions compatible with the Gemfile.
+    await exec.exec('bundle', ['lock'], envOptions)
+  }
+
+  await afterLockFile(lockFile, platform, engine)
+
+  // cache key
+  const paths = [cachePath]
+  const baseKey = await computeBaseKey(platform, engine, rubyVersion, lockFile)
+  const key = `${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}-`]
+  console.log(`Cache key: ${key}`)
+
+  // restore cache & install
+  let cachedKey = null
+  try {
+    cachedKey = await cache.restoreCache(paths, 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: ${cachedKey}`)
+  }
+
+  // Always run 'bundle install' to list the gems
+  await exec.exec('bundle', ['install', '--jobs', '4'])
+
+  // @actions/cache only allows to save for non-existing keys
+  if (cachedKey !== key) {
+    if (cachedKey) { // existing cache but Gemfile.lock differs, clean old gems
+      await exec.exec('bundle', ['clean'])
+    }
+
+    // Error handling from https://github.com/actions/cache/blob/master/src/save.ts
+    console.log('Saving cache')
+    try {
+      await cache.saveCache(paths, key)
+    } catch (error) {
+      if (error.name === cache.ValidationError.name) {
+        throw error;
+      } else if (error.name === cache.ReserveCacheError.name) {
+        core.info(error.message);
+      } else {
+        core.info(`[warning]${error.message}`)
+      }
+    }
+  }
+
+  return true
+}
+
+async function computeBaseKey(platform, engine, version, lockFile) {
+  let key = `setup-ruby-bundler-cache-v3-${platform}-${engine}-${version}`
+
+  if (engine !== 'jruby' && common.isHeadVersion(version)) {
+    let revision = '';
+    await exec.exec('ruby', ['-e', 'print RUBY_REVISION'], {
+      silent: true,
+      listeners: {
+        stdout: (data) => {
+          revision += data.toString();
+        }
+      }
+    });
+    key += `-revision-${revision}`
+  }
+
+  key += `-${lockFile}`
+  return key
+}
+
+
+/***/ }),
 /* 642 */,
 /* 643 */,
 /* 644 */,
@@ -47446,7 +47602,72 @@ exports.default = _default;
 /***/ }),
 /* 758 */,
 /* 759 */,
-/* 760 */,
+/* 760 */
+/***/ (function(module) {
+
+"use strict";
+
+module.exports = balanced;
+function balanced(a, b, str) {
+  if (a instanceof RegExp) a = maybeMatch(a, str);
+  if (b instanceof RegExp) b = maybeMatch(b, str);
+
+  var r = range(a, b, str);
+
+  return r && {
+    start: r[0],
+    end: r[1],
+    pre: str.slice(0, r[0]),
+    body: str.slice(r[0] + a.length, r[1]),
+    post: str.slice(r[1] + b.length)
+  };
+}
+
+function maybeMatch(reg, str) {
+  var m = str.match(reg);
+  return m ? m[0] : null;
+}
+
+balanced.range = range;
+function range(a, b, str) {
+  var begs, beg, left, right, result;
+  var ai = str.indexOf(a);
+  var bi = str.indexOf(b, ai + 1);
+  var i = ai;
+
+  if (ai >= 0 && bi > 0) {
+    begs = [];
+    left = str.length;
+
+    while (i >= 0 && !result) {
+      if (i == ai) {
+        begs.push(i);
+        ai = str.indexOf(a, i + 1);
+      } else if (begs.length == 1) {
+        result = [ begs.pop(), bi ];
+      } else {
+        beg = begs.pop();
+        if (beg < left) {
+          left = beg;
+          right = bi;
+        }
+
+        bi = str.indexOf(b, i + 1);
+      }
+
+      i = ai < bi && ai >= 0 ? ai : bi;
+    }
+
+    if (begs.length) {
+      result = [ left, right ];
+    }
+  }
+
+  return result;
+}
+
+
+/***/ }),
 /* 761 */
 /***/ (function(module) {
 
@@ -48853,7 +49074,7 @@ exports.safeTrimTrailingSeparator = safeTrimTrailingSeparator;
 /***/ (function(module, __unusedexports, __webpack_require__) {
 
 var concatMap = __webpack_require__(891);
-var balanced = __webpack_require__(417);
+var balanced = __webpack_require__(760);
 
 module.exports = expandTop;
 
@@ -49141,7 +49362,7 @@ exports.TraceAPI = TraceAPI;
 // Unique ID creation requires a high quality random # generator.  In node.js
 // this is pretty straight-forward - we use the crypto API.
 
-var crypto = __webpack_require__(373);
+var crypto = __webpack_require__(417);
 
 module.exports = function nodeRNG() {
   return crypto.randomBytes(16);
@@ -51831,9 +52052,8 @@ const os = __webpack_require__(87)
 const fs = __webpack_require__(747)
 const path = __webpack_require__(622)
 const core = __webpack_require__(186)
-const exec = __webpack_require__(514)
-const cache = __webpack_require__(799)
 const common = __webpack_require__(390)
+const bundler = __webpack_require__(641)
 
 const windows = common.windows
 
@@ -51890,36 +52110,20 @@ async function setupRuby(options = {}) {
   }
 
   if (inputs['bundler'] !== 'none') {
-    const [gemfile, lockFile] = detectGemfiles()
+    const [gemfile, lockFile] = bundler.detectGemfiles()
 
     const bundlerVersion = await common.measure('Installing Bundler', async () =>
-      installBundler(inputs['bundler'], lockFile, platform, rubyPrefix, engine, version))
+        bundler.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, bundlerVersion))
+          bundler.bundleInstall(gemfile, lockFile, platform, engine, version, bundlerVersion))
     }
   }
 
   core.setOutput('ruby-prefix', rubyPrefix)
 }
 
-// The returned gemfile is guaranteed to exist, the lockfile might not exist
-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 parseRubyEngineAndVersion(rubyVersion) {
   if (rubyVersion === 'default') {
     if (fs.existsSync('.ruby-version')) {
@@ -52003,168 +52207,6 @@ function envPreInstall() {
   }
 }
 
-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 && /^\d+/.test(nextLine.trim())) {
-        const bundlerVersion = nextLine.trim()
-        console.log(`Using Bundler ${bundlerVersion} from ${lockFile} BUNDLED WITH ${bundlerVersion}`)
-        return bundlerVersion
-      }
-    }
-  }
-  return null
-}
-
-async function installBundler(bundlerVersionInput, lockFile, platform, rubyPrefix, engine, rubyVersion) {
-  let bundlerVersion = bundlerVersionInput
-
-  if (bundlerVersion === 'default' || bundlerVersion === 'Gemfile.lock') {
-    bundlerVersion = readBundledWithFromGemfileLock(lockFile)
-
-    if (!bundlerVersion) {
-      bundlerVersion = 'latest'
-    }
-  }
-
-  if (bundlerVersion === 'latest') {
-    bundlerVersion = '2'
-  }
-
-  if (/^\d+/.test(bundlerVersion)) {
-    // OK
-  } else {
-    throw new Error(`Cannot parse bundler input: ${bundlerVersion}`)
-  }
-
-  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')) {
-    console.log('Ruby 2.3 has a bug with Bundler 2 (https://github.com/rubygems/rubygems/issues/3570), using Bundler 1 instead on Ruby 2.3')
-    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'
-  }
-
-  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.startsWith('1')) {
-    console.log(`Using Bundler 1 shipped with ${engine}`)
-  } else {
-    const gem = path.join(rubyPrefix, 'bin', 'gem')
-    const bundlerVersionConstraint = bundlerVersion.match(/^\d+\.\d+\.\d+/) ? bundlerVersion : `~> ${bundlerVersion}`
-    await exec.exec(gem, ['install', 'bundler', '-v', bundlerVersionConstraint, '--no-document'])
-  }
-
-  return bundlerVersion
-}
-
-async function bundleInstall(gemfile, lockFile, platform, engine, rubyVersion, bundlerVersion) {
-  if (gemfile === null) {
-    console.log('Could not determine gemfile path, skipping "bundle install" and caching')
-    return false
-  }
-
-  let envOptions = {}
-  if (bundlerVersion.startsWith('1') && common.isBundler2Default(engine, rubyVersion)) {
-    // If Bundler 1 is specified on Rubies which ship with Bundler 2,
-    // we need to specify which Bundler version to use explicitly until the lockfile exists.
-    console.log(`Setting BUNDLER_VERSION=${bundlerVersion} for "bundle config|lock" commands below to ensure Bundler 1 is used`)
-    envOptions = { env: { ...process.env, BUNDLER_VERSION: bundlerVersion } }
-  }
-
-  // config
-  const cachePath = 'vendor/bundle'
-  // An absolute path, so it is reliably under $PWD/vendor/bundle, and not relative to the gemfile's directory
-  const bundleCachePath = path.join(process.cwd(), cachePath)
-
-  await exec.exec('bundle', ['config', '--local', 'path', bundleCachePath], envOptions)
-
-  if (fs.existsSync(lockFile)) {
-    await exec.exec('bundle', ['config', '--local', 'deployment', 'true'], envOptions)
-  } else {
-    // Generate the lockfile so we can use it to compute the cache key.
-    // This will also automatically pick up the latest gem versions compatible with the Gemfile.
-    await exec.exec('bundle', ['lock'], envOptions)
-  }
-
-  // cache key
-  const paths = [cachePath]
-  const baseKey = await computeBaseKey(platform, engine, rubyVersion, lockFile)
-  const key = `${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}-`]
-  console.log(`Cache key: ${key}`)
-
-  // restore cache & install
-  let cachedKey = null
-  try {
-    cachedKey = await cache.restoreCache(paths, 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: ${cachedKey}`)
-  }
-
-  // Always run 'bundle install' to list the gems
-  await exec.exec('bundle', ['install', '--jobs', '4'])
-
-  // @actions/cache only allows to save for non-existing keys
-  if (cachedKey !== key) {
-    if (cachedKey) { // existing cache but Gemfile.lock differs, clean old gems
-      await exec.exec('bundle', ['clean'])
-    }
-
-    // Error handling from https://github.com/actions/cache/blob/master/src/save.ts
-    console.log('Saving cache')
-    try {
-      await cache.saveCache(paths, key)
-    } catch (error) {
-      if (error.name === cache.ValidationError.name) {
-        throw error;
-      } else if (error.name === cache.ReserveCacheError.name) {
-        core.info(error.message);
-      } else {
-        core.info(`[warning]${error.message}`)
-      }
-    }
-  }
-
-  return true
-}
-
-async function computeBaseKey(platform, engine, version, lockFile) {
-  let key = `setup-ruby-bundler-cache-v3-${platform}-${engine}-${version}`
-
-  if (engine !== 'jruby' && common.isHeadVersion(version)) {
-    let revision = '';
-    await exec.exec('ruby', ['-e', 'print RUBY_REVISION'], {
-      silent: true,
-      listeners: {
-        stdout: (data) => {
-          revision += data.toString();
-        }
-      }
-    });
-    key += `-revision-${revision}`
-  }
-
-  key += `-${lockFile}`
-  return key
-}
-
 if (__filename.endsWith('index.js')) { run() }
 
 
@@ -53979,7 +54021,7 @@ Object.defineProperty(exports, "__esModule", {
 });
 exports.default = rng;
 
-var _crypto = _interopRequireDefault(__webpack_require__(373));
+var _crypto = _interopRequireDefault(__webpack_require__(417));
 
 function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
 

gemfiles/nokogiri.gemfile

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

index.js

@@ -2,9 +2,8 @@ const os = require('os')
 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')
+const bundler = require('./bundler')
 
 const windows = common.windows
 
@@ -61,36 +60,20 @@ export async function setupRuby(options = {}) {
   }
 
   if (inputs['bundler'] !== 'none') {
-    const [gemfile, lockFile] = detectGemfiles()
+    const [gemfile, lockFile] = bundler.detectGemfiles()
 
     const bundlerVersion = await common.measure('Installing Bundler', async () =>
-      installBundler(inputs['bundler'], lockFile, platform, rubyPrefix, engine, version))
+        bundler.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, bundlerVersion))
+          bundler.bundleInstall(gemfile, lockFile, platform, engine, version, bundlerVersion))
     }
   }
 
   core.setOutput('ruby-prefix', rubyPrefix)
 }
 
-// The returned gemfile is guaranteed to exist, the lockfile might not exist
-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 parseRubyEngineAndVersion(rubyVersion) {
   if (rubyVersion === 'default') {
     if (fs.existsSync('.ruby-version')) {
@@ -174,166 +157,4 @@ function envPreInstall() {
   }
 }
 
-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 && /^\d+/.test(nextLine.trim())) {
-        const bundlerVersion = nextLine.trim()
-        console.log(`Using Bundler ${bundlerVersion} from ${lockFile} BUNDLED WITH ${bundlerVersion}`)
-        return bundlerVersion
-      }
-    }
-  }
-  return null
-}
-
-async function installBundler(bundlerVersionInput, lockFile, platform, rubyPrefix, engine, rubyVersion) {
-  let bundlerVersion = bundlerVersionInput
-
-  if (bundlerVersion === 'default' || bundlerVersion === 'Gemfile.lock') {
-    bundlerVersion = readBundledWithFromGemfileLock(lockFile)
-
-    if (!bundlerVersion) {
-      bundlerVersion = 'latest'
-    }
-  }
-
-  if (bundlerVersion === 'latest') {
-    bundlerVersion = '2'
-  }
-
-  if (/^\d+/.test(bundlerVersion)) {
-    // OK
-  } else {
-    throw new Error(`Cannot parse bundler input: ${bundlerVersion}`)
-  }
-
-  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')) {
-    console.log('Ruby 2.3 has a bug with Bundler 2 (https://github.com/rubygems/rubygems/issues/3570), using Bundler 1 instead on Ruby 2.3')
-    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'
-  }
-
-  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.startsWith('1')) {
-    console.log(`Using Bundler 1 shipped with ${engine}`)
-  } else {
-    const gem = path.join(rubyPrefix, 'bin', 'gem')
-    const bundlerVersionConstraint = bundlerVersion.match(/^\d+\.\d+\.\d+/) ? bundlerVersion : `~> ${bundlerVersion}`
-    await exec.exec(gem, ['install', 'bundler', '-v', bundlerVersionConstraint, '--no-document'])
-  }
-
-  return bundlerVersion
-}
-
-async function bundleInstall(gemfile, lockFile, platform, engine, rubyVersion, bundlerVersion) {
-  if (gemfile === null) {
-    console.log('Could not determine gemfile path, skipping "bundle install" and caching')
-    return false
-  }
-
-  let envOptions = {}
-  if (bundlerVersion.startsWith('1') && common.isBundler2Default(engine, rubyVersion)) {
-    // If Bundler 1 is specified on Rubies which ship with Bundler 2,
-    // we need to specify which Bundler version to use explicitly until the lockfile exists.
-    console.log(`Setting BUNDLER_VERSION=${bundlerVersion} for "bundle config|lock" commands below to ensure Bundler 1 is used`)
-    envOptions = { env: { ...process.env, BUNDLER_VERSION: bundlerVersion } }
-  }
-
-  // config
-  const cachePath = 'vendor/bundle'
-  // An absolute path, so it is reliably under $PWD/vendor/bundle, and not relative to the gemfile's directory
-  const bundleCachePath = path.join(process.cwd(), cachePath)
-
-  await exec.exec('bundle', ['config', '--local', 'path', bundleCachePath], envOptions)
-
-  if (fs.existsSync(lockFile)) {
-    await exec.exec('bundle', ['config', '--local', 'deployment', 'true'], envOptions)
-  } else {
-    // Generate the lockfile so we can use it to compute the cache key.
-    // This will also automatically pick up the latest gem versions compatible with the Gemfile.
-    await exec.exec('bundle', ['lock'], envOptions)
-  }
-
-  // cache key
-  const paths = [cachePath]
-  const baseKey = await computeBaseKey(platform, engine, rubyVersion, lockFile)
-  const key = `${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}-`]
-  console.log(`Cache key: ${key}`)
-
-  // restore cache & install
-  let cachedKey = null
-  try {
-    cachedKey = await cache.restoreCache(paths, 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: ${cachedKey}`)
-  }
-
-  // Always run 'bundle install' to list the gems
-  await exec.exec('bundle', ['install', '--jobs', '4'])
-
-  // @actions/cache only allows to save for non-existing keys
-  if (cachedKey !== key) {
-    if (cachedKey) { // existing cache but Gemfile.lock differs, clean old gems
-      await exec.exec('bundle', ['clean'])
-    }
-
-    // Error handling from https://github.com/actions/cache/blob/master/src/save.ts
-    console.log('Saving cache')
-    try {
-      await cache.saveCache(paths, key)
-    } catch (error) {
-      if (error.name === cache.ValidationError.name) {
-        throw error;
-      } else if (error.name === cache.ReserveCacheError.name) {
-        core.info(error.message);
-      } else {
-        core.info(`[warning]${error.message}`)
-      }
-    }
-  }
-
-  return true
-}
-
-async function computeBaseKey(platform, engine, version, lockFile) {
-  let key = `setup-ruby-bundler-cache-v3-${platform}-${engine}-${version}`
-
-  if (engine !== 'jruby' && common.isHeadVersion(version)) {
-    let revision = '';
-    await exec.exec('ruby', ['-e', 'print RUBY_REVISION'], {
-      silent: true,
-      listeners: {
-        stdout: (data) => {
-          revision += data.toString();
-        }
-      }
-    });
-    key += `-revision-${revision}`
-  }
-
-  key += `-${lockFile}`
-  return key
-}
-
 if (__filename.endsWith('index.js')) { run() }