Account for Bundler 4

* Fixes https://github.com/ruby/setup-ruby/issues/827

.github/workflows/test.yml

@@ -17,9 +17,9 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        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 ]
+        os: [ ubuntu-22.04, ubuntu-24.04, ubuntu-22.04-arm, ubuntu-24.04-arm, macos-13, macos-14, macos-15, macos-15-intel, 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,
+          '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', '4.0', ruby-head,
           jruby-9.4, jruby, jruby-head,
           truffleruby, truffleruby-head,
           truffleruby+graalvm, truffleruby+graalvm-head
@@ -79,6 +79,10 @@ jobs:
         - { os: windows-2022, ruby: '1.9' }
         - { os: windows-2025, ruby: '1.9' }
         - { os: windows-11-arm, ruby: '1.9' }
+        # No preview builds on Windows
+        - { os: windows-2022, ruby: '4.0' }
+        - { os: windows-2025, ruby: '4.0' }
+        - { os: windows-11-arm, ruby: '4.0' }
         # TruffleRuby does not support Windows
         - { os: windows-2022, ruby: truffleruby }
         - { os: windows-2025, ruby: truffleruby }

README.md

@@ -15,7 +15,7 @@ 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 |
+| `ruby` | 1.9.3, 2.0.0, 2.1.9, 2.2, all versions from 2.3.0 until 4.0.0-preview2, head, debug, mingw, mswin, ucrt |
 | `jruby` | 9.1.17.0 - 10.0.2.0, head |
 | `truffleruby` | 19.3.0 - 25.0.0, head |
 | `truffleruby+graalvm` | 21.2.0 - 25.0.0, head |

bundler.js

@@ -1,4 +1,5 @@
 const fs = require('fs')
+const os = require('os')
 const path = require('path')
 const core = require('@actions/core')
 const exec = require('@actions/exec')
@@ -66,17 +67,15 @@ export async function installBundler(bundlerVersionInput, rubygemsInputSet, lock
     }
   }
 
-  const floatVersion = common.floatVersion(rubyVersion)
-
   if (bundlerVersion === 'default') {
-    if (common.isBundler2dot2Default(engine, rubyVersion)) {
+    if (common.isBundler2dot2PlusDefault(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}`)
+        console.log(`Using Bundler shipped with ${engine}-${rubyVersion}`)
-        return '2'
+        return common.isBundler4PlusDefault(engine, rubyVersion) ? '4' : '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'`:
@@ -89,8 +88,15 @@ export async function installBundler(bundlerVersionInput, rubygemsInputSet, lock
     }
   }
 
+  const targetRubyVersion = common.targetRubyVersion(engine, rubyVersion)
+
   if (bundlerVersion === 'latest') {
-    bundlerVersion = '2'
+    // Bundler 4 requires Ruby 3.2+
+    if (targetRubyVersion < 3.2) {
+      bundlerVersion = '2'
+    } else {
+      bundlerVersion = '4'
+    }
   }
 
   if (isValidBundlerVersion(bundlerVersion)) {
@@ -99,24 +105,29 @@ export async function installBundler(bundlerVersionInput, rubygemsInputSet, lock
     throw new Error(`Cannot parse bundler input: ${bundlerVersion}`)
   }
 
-  // Use Bundler 1 when we know Bundler 2 does not work
+  // Only use Bundler 4 on Ruby 3.2+
-  if (bundlerVersion.startsWith('2')) {
+  if (common.floatVersion(bundlerVersion) >= 4 && targetRubyVersion < 3.2) {
-    if (engine === 'ruby' && floatVersion <= 2.2) {
+    console.log('Bundler 4 requires Ruby 3.2+, using Bundler 2 instead on Ruby < 3.2')
-      console.log('Bundler 2 requires Ruby 2.3+, using Bundler 1 on Ruby <= 2.2')
+    bundlerVersion = '2'
+  }
+
+  // Use Bundler 1 when we know Bundler 2+ does not work
+  if (common.floatVersion(bundlerVersion) >= 2) {
+    if (engine === 'ruby' && targetRubyVersion <= 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')
+      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 (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'
@@ -136,6 +147,14 @@ export async function installBundler(bundlerVersionInput, rubygemsInputSet, lock
   return bundlerVersion
 }
 
+function bundlerConfigSetArgs(bundlerVersion, key, value) {
+  if (bundlerVersion.startsWith('1')) {
+    return ['config', '--local', key, value]
+  } else {
+    return ['config', 'set', '--local', key, value]
+  }
+}
+
 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')
@@ -143,8 +162,8 @@ export async function bundleInstall(gemfile, lockFile, platform, engine, rubyVer
   }
 
   let envOptions = {}
-  if (bundlerVersion.startsWith('1') && common.isBundler2Default(engine, rubyVersion)) {
+  if (bundlerVersion.startsWith('1') && common.isBundler2PlusDefault(engine, rubyVersion)) {
-    // If Bundler 1 is specified on Rubies which ship with Bundler 2,
+    // 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 } }
@@ -155,10 +174,10 @@ export async function bundleInstall(gemfile, lockFile, platform, engine, rubyVer
   // 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)
+  await exec.exec('bundle', bundlerConfigSetArgs(bundlerVersion, 'path', bundleCachePath), envOptions)
 
   if (fs.existsSync(lockFile)) {
-    await exec.exec('bundle', ['config', '--local', 'deployment', 'true'], envOptions)
+    await exec.exec('bundle', bundlerConfigSetArgs(bundlerVersion, '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.
@@ -193,8 +212,10 @@ export async function bundleInstall(gemfile, lockFile, platform, engine, rubyVer
     console.log(`Found cache for key: ${cachedKey}`)
   }
 
+  // Number of jobs should scale with runner, up to a point
+  const jobs = Math.min(os.availableParallelism(), 8)
   // Always run 'bundle install' to list the gems
-  await exec.exec('bundle', ['install', '--jobs', '4'])
+  await exec.exec('bundle', ['install', '--jobs', `${jobs}`])
 
   // @actions/cache only allows to save for non-existing keys
   if (!common.isExactCacheKeyMatch(key, cachedKey)) {

common.js

@@ -80,7 +80,7 @@ export function isStableVersion(engine, rubyVersion) {
 }
 
 export function hasBundlerDefaultGem(engine, rubyVersion) {
-  return isBundler1Default(engine, rubyVersion) || isBundler2Default(engine, rubyVersion)
+  return isBundler1Default(engine, rubyVersion) || isBundler2PlusDefault(engine, rubyVersion)
 }
 
 export function isBundler1Default(engine, rubyVersion) {
@@ -95,7 +95,7 @@ export function isBundler1Default(engine, rubyVersion) {
   }
 }
 
-export function isBundler2Default(engine, rubyVersion) {
+export function isBundler2PlusDefault(engine, rubyVersion) {
   if (engine === 'ruby') {
     return floatVersion(rubyVersion) >= 2.7
   } else if (engine.startsWith('truffleruby')) {
@@ -107,7 +107,7 @@ export function isBundler2Default(engine, rubyVersion) {
   }
 }
 
-export function isBundler2dot2Default(engine, rubyVersion) {
+export function isBundler2dot2PlusDefault(engine, rubyVersion) {
   if (engine === 'ruby') {
     return floatVersion(rubyVersion) >= 3.0
   } else if (engine.startsWith('truffleruby')) {
@@ -119,6 +119,13 @@ export function isBundler2dot2Default(engine, rubyVersion) {
   }
 }
 
+const UNKNOWN_TARGET_RUBY_VERSION = 9.9
+
+export function isBundler4PlusDefault(engine, rubyVersion) {
+  const version = targetRubyVersion(engine, rubyVersion)
+  return version != UNKNOWN_TARGET_RUBY_VERSION && version >= 4.0
+}
+
 export function targetRubyVersion(engine, rubyVersion) {
   const version = floatVersion(rubyVersion)
   if (engine === 'ruby') {
@@ -132,6 +139,8 @@ export function targetRubyVersion(engine, rubyVersion) {
       return 2.6
     } else if (version === 9.4) {
       return 3.1
+    } else if (version === 10.0) {
+      return 3.4
     }
   } else if (engine.startsWith('truffleruby')) {
     if (version < 21.0) {
@@ -147,11 +156,11 @@ export function targetRubyVersion(engine, rubyVersion) {
     }
   }
 
-  return 9.9 // unknown, assume recent
+  return UNKNOWN_TARGET_RUBY_VERSION // unknown, assume recent
 }
 
 export function floatVersion(rubyVersion) {
-  const match = rubyVersion.match(/^\d+\.\d+/)
+  const match = rubyVersion.match(/^\d+(\.\d+|$)/)
   if (match) {
     return parseFloat(match[0])
   } else if (isHeadVersion(rubyVersion)) {

ruby-builder-versions.json

@@ -12,9 +12,10 @@
     "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",
+    "3.3.0-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", "3.3.10",
-    "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", "3.4.6",
+    "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", "3.4.6", "3.4.7",
     "3.5.0-preview1",
+    "4.0.0-preview2",
     "head", "debug", "asan", "3.4-asan"
   ],
   "jruby": [

windows-toolchain-versions.json

@@ -236,6 +236,9 @@
   "3.3.9": {
     "x64": "https://github.com/ruby/setup-msys2-gcc/releases/latest/download/msys2-ucrt64.7z"
   },
+  "3.3.10": {
+    "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"
@@ -260,6 +263,10 @@
     "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"
   },
+  "3.4.7": {
+    "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"

windows-versions.json

@@ -236,6 +236,9 @@
   "3.3.9": {
     "x64": "https://github.com/oneclick/rubyinstaller2/releases/download/RubyInstaller-3.3.9-1/rubyinstaller-3.3.9-1-x64.7z"
   },
+  "3.3.10": {
+    "x64": "https://github.com/oneclick/rubyinstaller2/releases/download/RubyInstaller-3.3.10-1/rubyinstaller-3.3.10-1-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"
@@ -260,6 +263,10 @@
     "arm64": "https://github.com/oneclick/rubyinstaller2/releases/download/RubyInstaller-3.4.6-1/rubyinstaller-3.4.6-1-arm.7z",
     "x64": "https://github.com/oneclick/rubyinstaller2/releases/download/RubyInstaller-3.4.6-1/rubyinstaller-3.4.6-1-x64.7z"
   },
+  "3.4.7": {
+    "arm64": "https://github.com/oneclick/rubyinstaller2/releases/download/RubyInstaller-3.4.7-1/rubyinstaller-3.4.7-1-arm.7z",
+    "x64": "https://github.com/oneclick/rubyinstaller2/releases/download/RubyInstaller-3.4.7-1/rubyinstaller-3.4.7-1-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"