Add Ruby 3.0.0

* See https://github.com/ruby/setup-ruby/issues/131

.github/workflows/test.yml

@@ -111,7 +111,38 @@ jobs:
       with:
         ruby-version: 2.6
         bundler: 2.1.4
-    - run: bundle --version | grep -F 2.1.4
+    - run: bundle --version | grep -F "Bundler version 2.1.4"
+
+  testDependencyOnBundler1:
+    name: "Test gemfile depending on Bundler 1"
+    runs-on: ubuntu-latest
+    env:
+      BUNDLE_GEMFILE: gemfiles/bundler1.gemfile
+    steps:
+      - uses: actions/checkout@v2
+      - uses: ./
+        with:
+          ruby-version: 2.7
+          bundler: 1
+          bundler-cache: true
+      - run: bundle --version | grep -F "Bundler version 1."
+
+  testGemfileMatrix:
+    strategy:
+      fail-fast: false
+      matrix:
+        gemfile: [ rails5, rails6 ]
+    name: "Test with ${{ matrix.gemfile }} gemfile"
+    runs-on: ubuntu-latest
+    env:
+      BUNDLE_GEMFILE: gemfiles/${{ matrix.gemfile }}.gemfile
+    steps:
+      - uses: actions/checkout@v2
+      - uses: ./
+        with:
+          ruby-version: 2.6
+          bundler-cache: true
+      - run: bundle exec rails --version
 
   lint:
     runs-on: ubuntu-20.04

README.md

@@ -14,7 +14,7 @@ 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, 3.0.0,<br/> head, debug, mingw, mswin |
 | `jruby` | 9.1.17.0, 9.2.9.0 - 9.2.13.0, head |
 | `truffleruby` | 19.3.0 - 20.3.0, head |
 
@@ -70,7 +70,7 @@ jobs:
     - run: bundle exec rake
 ```
 
-### Matrix
+### Matrix of Ruby Versions
 
 This matrix tests all stable releases and `head` versions of MRI, JRuby and TruffleRuby on Ubuntu and macOS.
 
@@ -83,7 +83,7 @@ jobs:
       fail-fast: false
       matrix:
         os: [ubuntu-latest, macos-latest]
-        ruby: [2.5, 2.6, 2.7, head, jruby, jruby-head, truffleruby, truffleruby-head]
+        ruby: [2.5, 2.6, 2.7, '3.0', head, jruby, jruby-head, truffleruby, truffleruby-head]
     runs-on: ${{ matrix.os }}
     steps:
     - uses: actions/checkout@v2
@@ -94,6 +94,29 @@ jobs:
     - run: bundle exec rake
 ```
 
+### Matrix of Gemfiles
+
+```yaml
+name: My workflow
+on: [push]
+jobs:
+  test:
+    strategy:
+      fail-fast: false
+      matrix:
+        gemfile: [ rails5, rails6 ]
+    runs-on: ubuntu-latest
+    env: # $BUNDLE_GEMFILE must be set at the job level, so it is set for all steps
+      BUNDLE_GEMFILE: gemfiles/${{ matrix.gemfile }}.gemfile
+    steps:
+      - uses: actions/checkout@v2
+      - uses: ./
+        with:
+          ruby-version: 2.6
+          bundler-cache: true # runs 'bundle install' and caches installed gems automatically
+      - run: bundle exec rake
+```
+
 See the GitHub Actions documentation for more details about the
 [workflow syntax](https://help.github.com/en/actions/reference/workflow-syntax-for-github-actions)
 and the [condition and expression syntax](https://help.github.com/en/actions/reference/context-and-expression-syntax-for-github-actions).
@@ -136,24 +159,10 @@ This caching speeds up installing gems significantly and avoids too many request
 It needs a `Gemfile` (or `$BUNDLE_GEMFILE` or `gems.rb`) under the [`working-directory`](#working-directory).  
 If there is a `Gemfile.lock` (or `$BUNDLE_GEMFILE.lock` or `gems.locked`), `bundle config --local deployment true` is used.
 
-To use a `Gemfile` which is not at the root or has a different name, set `BUNDLE_GEMFILE` in the `env` at the job level, so it is set for all steps:
-```yaml
-jobs:
-  test:
-    runs-on: ubuntu-latest
-    env:
-      BUNDLE_GEMFILE: subdir/mygemfile
-    steps:
-    - uses: actions/checkout@v2
-    - uses: ruby/setup-ruby@v1
-      with:
-        ruby-version: 2.6
-        bundler-cache: true
-    - run: bundle exec rake
-```
-Of course you can also use a matrix of gemfiles if you need to test multiple gemfiles.
+To use a `Gemfile` which is not at the root or has a different name, set `BUNDLE_GEMFILE` in the `env` at the job level
+as shown in the [example](#matrix-of-gemfiles).
 
-To perform caching, this action will use `bundle config --local path vendor/bundle`.  
+To perform caching, this action will use `bundle config --local path $PWD/vendor/bundle`.  
 Therefore, the Bundler `path` should not be changed in your workflow for the cache to work (no `bundle config path`).
 
 ## Windows

dist/index.js

@@ -45192,7 +45192,7 @@ 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-preview2", "3.0.0-rc1",
+      "3.0.0-preview1", "3.0.0-preview2", "3.0.0-rc1", "3.0.0",
       "head", "debug",
     ],
     "jruby": [
@@ -51908,6 +51908,8 @@ 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")) {
@@ -52044,7 +52046,7 @@ async function installBundler(bundlerVersionInput, lockFile, platform, rubyPrefi
   } 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
+  } 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'
   }
@@ -52076,9 +52078,11 @@ async function bundleInstall(gemfile, lockFile, platform, engine, rubyVersion, b
   }
 
   // config
-  const path = 'vendor/bundle'
+  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', path], envOptions)
+  await exec.exec('bundle', ['config', '--local', 'path', bundleCachePath], envOptions)
 
   if (fs.existsSync(lockFile)) {
     await exec.exec('bundle', ['config', '--local', 'deployment', 'true'], envOptions)
@@ -52089,7 +52093,7 @@ async function bundleInstall(gemfile, lockFile, platform, engine, rubyVersion, b
   }
 
   // cache key
-  const paths = [path]
+  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
@@ -52140,7 +52144,7 @@ async function bundleInstall(gemfile, lockFile, platform, engine, rubyVersion, b
 }
 
 async function computeBaseKey(platform, engine, version, lockFile) {
-  let key = `setup-ruby-bundler-cache-v2-${platform}-${engine}-${version}`
+  let key = `setup-ruby-bundler-cache-v3-${platform}-${engine}-${version}`
 
   if (engine !== 'jruby' && common.isHeadVersion(version)) {
     let revision = '';

gemfiles/bundler1.gemfile

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

gemfiles/rails5.gemfile

@@ -0,0 +1,3 @@
+source "https://rubygems.org"
+
+gem "rails", "~> 5.2.0"

gemfiles/rails6.gemfile

@@ -0,0 +1,3 @@
+source "https://rubygems.org"
+
+gem "rails", "~> 6.0.0"

index.js

@@ -80,6 +80,8 @@ 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")) {
@@ -216,7 +218,7 @@ async function installBundler(bundlerVersionInput, lockFile, platform, rubyPrefi
   } 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
+  } 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'
   }
@@ -248,9 +250,11 @@ async function bundleInstall(gemfile, lockFile, platform, engine, rubyVersion, b
   }
 
   // config
-  const path = 'vendor/bundle'
+  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', path], envOptions)
+  await exec.exec('bundle', ['config', '--local', 'path', bundleCachePath], envOptions)
 
   if (fs.existsSync(lockFile)) {
     await exec.exec('bundle', ['config', '--local', 'deployment', 'true'], envOptions)
@@ -261,7 +265,7 @@ async function bundleInstall(gemfile, lockFile, platform, engine, rubyVersion, b
   }
 
   // cache key
-  const paths = [path]
+  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
@@ -312,7 +316,7 @@ async function bundleInstall(gemfile, lockFile, platform, engine, rubyVersion, b
 }
 
 async function computeBaseKey(platform, engine, version, lockFile) {
-  let key = `setup-ruby-bundler-cache-v2-${platform}-${engine}-${version}`
+  let key = `setup-ruby-bundler-cache-v3-${platform}-${engine}-${version}`
 
   if (engine !== 'jruby' && common.isHeadVersion(version)) {
     let revision = '';

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-preview2", "3.0.0-rc1",
+      "3.0.0-preview1", "3.0.0-preview2", "3.0.0-rc1", "3.0.0",
       "head", "debug",
     ],
     "jruby": [