Fix golang download url to go.dev (#469)

* Fix golang download url to go.dev

* Fix const name

* Run `npm run build`

.github/workflows/basic-validation.yml

@@ -15,4 +15,4 @@ jobs:
     name: Basic validation
     uses: actions/reusable-workflows/.github/workflows/basic-validation.yml@main
     with:
-      node-version: '20'
+      node-version: '24.x'

.github/workflows/check-dist.yml

@@ -16,4 +16,4 @@ jobs:
     name: Check dist/
     uses: actions/reusable-workflows/.github/workflows/check-dist.yml@main
     with:
-      node-version: '20'
+      node-version: '24.x'

.github/workflows/publish-immutable-actions.yml

@@ -14,7 +14,7 @@ jobs:
 
     steps:
       - name: Checking out
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
       - name: Publish
         id: publish
         uses: actions/publish-immutable-action@v0.0.4

.github/workflows/release-new-action-version.yml

@@ -22,7 +22,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Update the ${{ env.TAG_NAME }} tag
-        uses: actions/publish-action@v0.3.0
+        uses: actions/publish-action@v0.4.0
         with:
           source-tag: ${{ env.TAG_NAME }}
           slack-webhook: ${{ secrets.SLACK_WEBHOOK }}

.github/workflows/versions.yml

@@ -18,9 +18,9 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: [ubuntu-latest, windows-latest, macos-latest, macos-13]
+        os: [ubuntu-latest, windows-latest, macos-latest, macos-latest-large]
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - name: Setup Go Stable
         uses: ./
         with:
@@ -33,9 +33,9 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: [ubuntu-latest, windows-latest, macos-latest, macos-13]
+        os: [ubuntu-latest, windows-latest, macos-latest, macos-latest-large]
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - name: Setup Go oldStable
         uses: ./
         with:
@@ -48,16 +48,16 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: [ubuntu-latest, windows-latest, macos-latest, macos-13]
+        os: [ubuntu-latest, windows-latest, macos-latest, macos-latest-large]
         version: [stable, oldstable]
         architecture: [x64, x32]
         exclude:
           - os: macos-latest
             architecture: x32
-          - os: macos-13
+          - os: macos-latest-large
             architecture: x32
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - name: Setup Go ${{ matrix.version }} ${{ matrix.architecture }}
         uses: ./
         with:
@@ -72,7 +72,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: [macos-latest, windows-latest, ubuntu-latest, macos-13]
+        os: [macos-latest, windows-latest, ubuntu-latest, macos-latest-large]
         go: [1.21.13, 1.22.8, 1.23.2]
         include:
           - os: windows-latest
@@ -82,7 +82,7 @@ jobs:
             go: 1.23.2
     steps:
       - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       - name: setup-go ${{ matrix.go }}
         uses: ./
@@ -98,10 +98,10 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: [ubuntu-latest, windows-latest, macos-latest, macos-13]
+        os: [ubuntu-latest, windows-latest, macos-latest, macos-latest-large]
         go-version: ['1.20', '1.21', '1.22', '1.23']
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - name: Setup Go and check latest
         uses: ./
         with:
@@ -115,9 +115,9 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: [ubuntu-latest, windows-latest, macos-latest, macos-13]
+        os: [ubuntu-latest, windows-latest, macos-latest, macos-latest-large]
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - name: Setup Go and check latest
         uses: ./
         with:
@@ -131,9 +131,9 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: [ubuntu-latest, windows-latest, macos-latest, macos-13]
+        os: [ubuntu-latest, windows-latest, macos-latest, macos-latest-large]
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - name: Setup Go and check latest
         uses: ./
         with:
@@ -142,16 +142,48 @@ jobs:
         run: __tests__/verify-go.sh 1.21
         shell: bash
 
+  go-version-file-with-tool-versions:
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [ubuntu-latest, windows-latest, macos-latest, macos-latest-large]
+    steps:
+      - uses: actions/checkout@v6
+      - name: Setup Go and check latest
+        uses: ./
+        with:
+          go-version-file: __tests__/data/.tool-versions
+      - name: verify go
+        run: __tests__/verify-go.sh 1.23.2
+        shell: bash
+
+  go-version-file-with-go-version:
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [ubuntu-latest, windows-latest, macos-latest, macos-latest-large]
+    steps:
+      - uses: actions/checkout@v6
+      - name: Setup Go from .go-version file
+        uses: ./
+        with:
+          go-version-file: __tests__/data/.go-version
+      - name: verify go
+        run: __tests__/verify-go.sh 1.22.4
+        shell: bash
+
   setup-versions-from-manifest:
     runs-on: ${{ matrix.os }}
     strategy:
       fail-fast: false
       matrix:
-        os: [macos-latest, windows-latest, ubuntu-latest, macos-13]
+        os: [macos-latest, windows-latest, ubuntu-latest, macos-latest-large]
         go: [1.20.14, 1.21.10, 1.22.8, 1.23.2]
     steps:
       - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       - name: setup-go ${{ matrix.go }}
         uses: ./
@@ -167,11 +199,11 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: [windows-latest, ubuntu-latest, macos-13]
+        os: [windows-latest, ubuntu-latest, macos-latest-large]
         go: [1.11.12]
     steps:
       - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       - name: setup-go ${{ matrix.go }}
         uses: ./
@@ -187,7 +219,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: [ubuntu-latest, windows-latest, macos-latest, macos-13]
+        os: [ubuntu-latest, windows-latest, macos-latest, macos-latest-large]
         go-version: [1.20.14, 1.21, 1.22, 1.23]
         include:
           - os: macos-latest
@@ -196,10 +228,10 @@ jobs:
             architecture: x64
           - os: windows-latest
             architecture: x64
-          - os: macos-13
+          - os: macos-latest-large
             architecture: x64
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - name: Setup Go and check latest
         uses: ./
         with:

.github/workflows/windows-validation.yml

@@ -19,7 +19,7 @@ jobs:
         cache: [false, true]
         go: [1.20.1]
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
 
       - name: 'Setup ${{ matrix.cache }}, cache: ${{ matrix.go }}'
         uses: ./
@@ -88,7 +88,7 @@ jobs:
       matrix:
         cache: [false, true]
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
 
       - name: 'Setup default go, cache: ${{ matrix.cache }}'
         uses: ./
@@ -121,7 +121,7 @@ jobs:
         cache: [false]
         go: [1.20.1]
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
 
       - name: 'Setup ${{ matrix.go }}, cache: ${{ matrix.cache }}'
         uses: ./

README.md

@@ -3,282 +3,478 @@
 [![Basic validation](https://github.com/actions/setup-go/actions/workflows/basic-validation.yml/badge.svg)](https://github.com/actions/setup-go/actions/workflows/basic-validation.yml)
 [![Validate 'setup-go'](https://github.com/actions/setup-go/actions/workflows/versions.yml/badge.svg)](https://github.com/actions/setup-go/actions/workflows/versions.yml)
 
-This action sets up a go environment for use in actions by:
+This action sets up a Go environment for use in GitHub Actions by:
 
-- Optionally downloading and caching a version of Go by version and adding to `PATH`.
-- Registering problem matchers for error output.
+- Optionally downloading and caching a version of Go by version and adding to PATH
+- Registering problem matchers for error output
+- Providing intelligent caching for Go modules and build outputs
 
-# V5
-
-The V5 edition of the action offers:
-
-- Upgraded Node.js runtime from node16 to node20
-
-See full release notes on the [releases page](https://github.com/actions/setup-go/releases).
-
-# V4
-
-The V4 edition of the action offers:
-
- - Enabled caching by default
-
-The action will try to enable caching unless the `cache` input is explicitly set to false.
-
-Please see "[Caching dependency files and build outputs](https://github.com/actions/setup-go#caching-dependency-files-and-build-outputs)" for more information.
-
-# V3
-
-The V3 edition of the action offers:
-
-- Adds `GOBIN` to the `PATH`
-- Proxy support
-- Check latest version
-- Caching packages dependencies
-- stable and oldstable aliases
-- Bug Fixes (including issues around version matching and semver)
-
-The action will first check the local cache for a version match. If a version is not found locally, it will pull it from
-the `main` branch of the [go-versions](https://github.com/actions/go-versions/blob/main/versions-manifest.json)
-repository. On miss or failure, it will fall back to downloading directly
-from [go dist](https://storage.googleapis.com/golang). To change the default behavior, please use
-the [check-latest input](#check-latest-version).
-
-**Note:** The `setup-go` action uses executable binaries which are built by Golang side. The action does not build
-golang from source code.
-
-Matching by [semver spec](https://github.com/npm/node-semver):
+## Quick Start
 
 ```yaml
 steps:
-  - uses: actions/checkout@v4
-  - uses: actions/setup-go@v5
+  - uses: actions/checkout@v6
+  - uses: actions/setup-go@v6
     with:
-      go-version: '^1.13.1' # The Go version to download (if necessary) and use.
+      go-version: '1.23'
+  - run: go version
+```
+
+## Breaking Changes
+
+### V6 Changes
+
+**Node Runtime Upgrade**
+- **Upgraded from Node 20 to Node 24**
+- ⚠️ **Action Required**: Ensure your runner is on version v2.327.1 or later for compatibility
+- See [Release Notes](https://github.com/actions/runner/releases/tag/v2.327.1) for more details
+
+**Enhanced Go Toolchain Management**
+
+V6 introduces significant improvements for reliable and consistent Go version selection. Supports both `go` and `toolchain` directives in `go.mod`. If the `toolchain` directive is present, its version is used; otherwise, the action falls back to the go directive.
+   
+**Cache Key Update**
+
+By default, caching for Go modules now relies on `go.mod`. To use `go.sum`, configure the `cache-dependency-path` input.
+
+For more details, see the [full release notes](https://github.com/actions/setup-go/releases/tag/v6.0.0).
+
+### V5 Changes
+
+- **Upgraded Node.js runtime from node16 to node20**
+- See [full release notes](https://github.com/actions/setup-go/releases) for complete details
+
+## Version Resolution Behavior
+
+The action follows this resolution order:
+1. **Local cache** - Checks for a cached version match
+2. **go-versions repository** - Pulls from the main branch of the [go-versions repository](https://github.com/actions/go-versions/blob/main/versions-manifest.json)
+3. **Direct download** - Falls back to downloading directly from [go.dev](https://go.dev/dl)
+
+To change the default behavior, use the `check-latest` input.
+
+> **Note**: The setup-go action uses executable binaries built by the Golang team. The action does not build golang from source code.
+
+## Usage
+
+### Basic Setup
+
+```yaml
+steps:
+  - uses: actions/checkout@v6
+  - uses: actions/setup-go@v6
+    with:
+      go-version: '1.23'
+  - run: go run hello.go
+```
+
+### Version Specifications
+
+#### Semantic Versioning
+
+```yaml
+steps:
+  - uses: actions/checkout@v6
+  - uses: actions/setup-go@v6
+    with:
+      go-version: '^1.23.1' # The Go version to download (if necessary) and use.
   - run: go version
 ```
 
 ```yaml
 steps:
-  - uses: actions/checkout@v4
-  - uses: actions/setup-go@v5
+  - uses: actions/checkout@v6
+  - uses: actions/setup-go@v6
     with:
-      go-version: '>=1.17.0'
+      go-version: '>=1.22.0'
   - run: go version
 ```
 
-> **Note**: Due to the peculiarities of YAML parsing, it is recommended to wrap the version in single quotation marks:
->
+> **Important**: Due to YAML parsing behavior, always wrap version numbers in single quotes:
 > ```yaml
->   go-version: '1.20'
+> go-version: '1.22'  # Correct
+> go-version: 1.22    # Incorrect - YAML parser interprets as 1.2
 > ```
->
-> The recommendation is based on the YAML parser's behavior, which interprets non-wrapped values as numbers and, in the case of version 1.20, trims it down to 1.2, which may not be very obvious.
 
-Matching an unstable pre-release:
+#### Pre-release Versions
 
 ```yaml
+# RC version
 steps:
-  - uses: actions/checkout@v4
-  - uses: actions/setup-go@v5
+  - uses: actions/checkout@v6
+  - uses: actions/setup-go@v6
     with:
-      go-version: '1.18.0-rc.1' # The Go version to download (if necessary) and use.
+       go-version: '1.24.0-rc.1' # The Go version to download (if necessary) and use
   - run: go version
 ```
 
 ```yaml
+# Beta version
 steps:
-  - uses: actions/checkout@v4
-  - uses: actions/setup-go@v5
+  - uses: actions/checkout@v6
+  - uses: actions/setup-go@v6
     with:
-      go-version: '1.16.0-beta.1' # The Go version to download (if necessary) and use.
+      go-version: '1.23.0-beta.1' # The Go version to download (if necessary) and use
   - run: go version
 ```
 
-# Usage
+#### Version Aliases
 
-See [action.yml](action.yml)
+**Stable Release**
 
-## Basic
+If `stable` is provided, action will get the latest stable version from the [go-versions](https://github.com/actions/go-versions/blob/main/versions-manifest.json) repository manifest.
+```yaml
+steps:
+  - uses: actions/checkout@v6
+  - uses: actions/setup-go@v6
+    with:
+      go-version: 'stable' # Latest stable version
+  - run: go version
+```
+
+**Previous Stable Release**
+
+If `oldstable` is provided, when the current release is 1.23.x, the action will resolve version as 1.22.x, where x is the latest patch release.
+```yaml
+steps:
+  - uses: actions/checkout@v6
+  - uses: actions/setup-go@v6
+    with:
+      go-version: 'oldstable' # Previous stable version
+  - run: go version
+```
+
+> **Note**: Using aliases is equivalent to using the corresponding minor release with `check-latest: true`
+
+### go-version-file
+
+The action can automatically detect the Go version from various project files using the `go-version-file` input. This parameter supports `go.mod`, `go.work`, `.go-version`, and `.tool-versions` files.
+
+> **Note**: If both `go-version` and `go-version-file` are provided, `go-version` takes precedence.
+
+#### go.mod File
+
+Automatically detect the Go version from your project's `go.mod` file:
 
 ```yaml
 steps:
-  - uses: actions/checkout@v4
-  - uses: actions/setup-go@v5
+  - uses: actions/checkout@v6
+  - uses: actions/setup-go@v6
     with:
-      go-version: '1.16.1' # The Go version to download (if necessary) and use.
+      go-version-file: 'go.mod'
+  - run: go version
+```
+
+**Version Resolution from go.mod:**
+1. Uses the `toolchain` directive version if present
+2. Falls back to the `go` directive version
+3. If no patch version is specified, uses the latest available patch
+
+#### go.work File
+
+Use the Go version specified in your `go.work` file:
+
+```yaml
+steps:
+  - uses: actions/checkout@v6
+  - uses: actions/setup-go@v6
+    with:
+      go-version-file: 'go.work'
+  - run: go version
+```
+
+#### .go-version File
+
+Read the Go version from a `.go-version` file:
+
+```yaml
+steps:
+  - uses: actions/checkout@v6
+  - uses: actions/setup-go@v6
+    with:
+      go-version-file: '.go-version'
+  - run: go version
+```
+
+#### .tool-versions File
+
+Use the Go version from an [`.tool-versions`](https://asdf-vm.com/manage/configuration.html#tool-versions) file:
+
+```yaml
+steps:
+  - uses: actions/checkout@v6
+  - uses: actions/setup-go@v6
+    with:
+      go-version-file: '.tool-versions'
+  - run: go version
+```
+
+#### Custom File Paths
+
+The action searches for version files relative to the repository root by default. You can specify a custom path:
+
+```yaml
+steps:
+  - uses: actions/checkout@v6
+  - uses: actions/setup-go@v6
+    with:
+      go-version-file: 'path/to/.go-version'
+  - run: go version
+```
+
+**Supported Version Formats:**
+- Major and minor only: `1.25` (action will use the latest patch version, e.g., `1.25.4`)
+- Major, minor, and patch: `1.25.4` (exact version)
+
+### Check Latest Version
+
+The check-latest flag defaults to false for stability. This ensures your workflow uses a specific, predictable Go version.
+When `check-latest: true`, the action verifies if your cached Go version is the latest available. If not, it downloads and uses the newest version.
+
+```yaml
+steps:
+  - uses: actions/checkout@v6
+  - uses: actions/setup-go@v6
+    with:
+      go-version: '1.23'
+      check-latest: true # Always check for the latest patch release
+  - run: go version
+```
+
+**Performance Considerations:**
+- `check-latest: false` (default) - Uses cached versions for faster builds
+- `check-latest: true` - Downloads the latest version, slower but ensures up-to-date releases
+
+### Caching
+
+The action features integrated caching for Go modules and build outputs. Built on [toolkit/cache](https://github.com/actions/toolkit/tree/main/packages/cache), it simplifies the caching process by requiring fewer configuration options. The cache input is optional, and caching is turned on by default.
+
+#### Automatic Caching
+
+Default behavior: Searches for `go.mod` in the repository root and uses its hash for the cache key.
+
+```yaml
+steps:
+  - uses: actions/checkout@v6
+  - uses: actions/setup-go@v6
+    with:
+      go-version: '1.23'
+      # cache: true (default)
   - run: go run hello.go
 ```
 
-## Check latest version
+#### Advanced Caching Scenarios
 
-The `check-latest` flag defaults to `false`. Use the default or set `check-latest` to `false` if you prefer stability
-and if you want to ensure a specific Go version is always used.
-
-If `check-latest` is set to `true`, the action first checks if the cached version is the latest one. If the locally
-cached version is not the most up-to-date, a Go version will then be downloaded. Set `check-latest` to `true` if you
-want the most up-to-date Go version to always be used.
-
-> Setting `check-latest` to `true` has performance implications as downloading Go versions is slower than using cached
-> versions.
+For advanced scenarios, use `cache-dependency-path` to specify:
+- **Multiple dependency files**: When your project has dependencies in different directories
+- **Custom locations**: When your `go.sum` files are not in the repository root
+- **Monorepos**: When managing multiple Go modules in a single repository
+- **Glob patterns**: For flexible file matching
 
 ```yaml
+# Example: Monorepo with multiple go.sum files
 steps:
-  - uses: actions/checkout@v4
-  - uses: actions/setup-go@v5
+  - uses: actions/checkout@v6
+  - uses: actions/setup-go@v6
     with:
-      go-version: '1.14'
-      check-latest: true
-  - run: go run hello.go
-```
-
-## Using stable/oldstable aliases
-
-If `stable` is provided, action will get the latest stable version from
-the [`go-versions`](https://github.com/actions/go-versions/blob/main/versions-manifest.json) repository manifest.
-
-If `oldstable` is provided, when current release is 1.19.x, action will resolve version as 1.18.x, where x is the latest
-patch release.
-
-**Note:** using these aliases will result in same version as using corresponding minor release with `check-latest` input
-set to `true`
-
-```yaml
-steps:
-  - uses: actions/checkout@v4
-  - uses: actions/setup-go@v5
-    with:
-      go-version: 'stable'
-  - run: go run hello.go
-```
-
-```yaml
-steps:
-  - uses: actions/checkout@v4
-  - uses: actions/setup-go@v5
-    with:
-      go-version: 'oldstable'
-  - run: go run hello.go
-```
-
-## Caching dependency files and build outputs:
-
-The action has a built-in functionality for caching and restoring go modules and build outputs. It
-uses [toolkit/cache](https://github.com/actions/toolkit/tree/main/packages/cache) under the hood but requires less configuration settings.
-The `cache` input is optional, and caching is turned on by default.
-
-The action defaults to search for the dependency file - go.sum in the repository root, and uses its hash as a part of
-the cache key. Use `cache-dependency-path` input for cases when multiple dependency files are used, or they are located
-in different subdirectories. The input supports glob patterns.
-
-If some problem that prevents success caching happens then the action issues the warning in the log and continues the execution of the pipeline.
-
-**Caching in monorepos**
-
-```yaml
-steps:
-  - uses: actions/checkout@v4
-  - uses: actions/setup-go@v5
-    with:
-      go-version: '1.17'
+      go-version: '1.23'
       check-latest: true
       cache-dependency-path: |
-             subdir/go.sum
-             tools/go.sum
-    # cache-dependency-path: "**/*.sum"
-
+        subdir/go.sum
+        tools/go.sum
   - run: go run hello.go
-  ```
+```
 
-## Getting go version from the go.mod file
+```yaml
+# Example: Using glob patterns to match all go.sum files
+steps:
+  - uses: actions/checkout@v6
+  - uses: actions/setup-go@v6
+    with:
+      go-version: '1.23'
+      cache-dependency-path: "**/*.sum"
+  - run: go run hello.go
+```
 
-The `go-version-file` input accepts a path to a `go.mod` file or a `go.work` file that contains the version of Go to be used by a project.
-
-The `go` directive in `go.mod` can specify a patch version or omit it altogether (e.g., `go 1.22.0` or `go 1.22`).  
-If a patch version is specified, that specific patch version will be used.  
-If no patch version is specified, it will search for the latest available patch version in the cache,
-[versions-manifest.json](https://github.com/actions/go-versions/blob/main/versions-manifest.json), and the
-[official Go language website](https://golang.org/dl/?mode=json&include=all), in that order.
-
-If both the `go-version` and the `go-version-file` inputs are provided then the `go-version` input is used.
-> The action will search for the `go.mod` file relative to the repository root
+#### Disable Caching
 
 ```yaml
 steps:
-  - uses: actions/checkout@v4
-  - uses: actions/setup-go@v5
+  - uses: actions/checkout@v6
+  - uses: actions/setup-go@v6
     with:
-      go-version-file: 'path/to/go.mod'
-  - run: go version
+      go-version: '1.23'
+      cache: false
+  - run: go run hello.go
 ```
 
-## Matrix testing
+> **Note**: If caching fails, the action logs a warning but continues execution without interrupting your workflow.
+
+**Restore-Only Cache**
+
+```yaml
+# In some workflows, you may want to restore a cache without saving it. This can help reduce cache writes and storage usage in workflows that only need to read from cache
+jobs:
+    build:
+      runs-on: ${{ matrix.os }}
+      strategy:
+        matrix:
+          os: [ubuntu-latest, macos-latest, windows-latest]
+      steps:
+        - uses: actions/checkout@v6
+        - name: Setup Go
+          id: setup-go
+          uses: actions/setup-go@v6
+          with:
+            go-version: '1.24.10'
+            cache: false
+        # Capture Go cache locations
+        - name: Set Go cache variables (Linux/macOS)
+          if: runner.os != 'Windows'
+          run: |
+            echo "GO_MOD_CACHE=$(go env GOMODCACHE)" >> $GITHUB_ENV
+            echo "GO_BUILD_CACHE=$(go env GOCACHE)" >> $GITHUB_ENV
+        - name: Set Go cache variables (Windows)
+          if: runner.os == 'Windows'
+          shell: pwsh
+          run: |
+            echo "GO_MOD_CACHE=$(go env GOMODCACHE)" | Out-File $env:GITHUB_ENV -Append
+            echo "GO_BUILD_CACHE=$(go env GOCACHE)"   | Out-File $env:GITHUB_ENV -Append
+        # Normalize runner.arch to lowercase to ensure consistent cache keys
+        - name: Normalize runner architecture (Linux/macOS)
+          if: runner.os != 'Windows'
+          shell: bash
+          run: echo "ARCH=$(echo '${{ runner.arch }}' | tr '[:upper:]' '[:lower:]')" >> $GITHUB_ENV
+        - name: Normalize runner architecture (Windows)
+          if: runner.os == 'Windows'
+          shell: pwsh
+          run: |
+            $arch = "${{ runner.arch }}".ToLower()
+            echo "ARCH=$arch" | Out-File $env:GITHUB_ENV -Append
+        - name: Set cache OS suffix for Linux
+          if: runner.os == 'Linux'
+          shell: bash
+          run: echo "CACHE_OS_SUFFIX=$ImageOS-" >> $GITHUB_ENV    
+        - name: Restore Go cache
+          id: go-cache
+          uses: actions/cache/restore@v5
+          with:
+            path: |
+              ${{ env.GO_MOD_CACHE }}
+              ${{ env.GO_BUILD_CACHE }}
+            key: setup-go-${{ runner.os }}-${{ env.ARCH }}-${{ env.CACHE_OS_SUFFIX }}go-${{ steps.setup-go.outputs.go-version }}-${{ hashFiles('**/go.mod') }}
+        - name: Download modules
+          run: go mod download
+        - name: Build
+          run: go build ./...
+```
+> If there are several builds on the same repo it might make sense to create a cache in one build and use it in the
+others. The action [actions/cache/restore](https://github.com/actions/cache/tree/main/restore#only-restore-cache)
+should be used in this case.
+
+### Matrix Testing
+
+Test across multiple Go versions:
 
 ```yaml
 jobs:
-  build:
+  test:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        go: [ '1.14', '1.13' ]
-    name: Go ${{ matrix.go }} sample
+        go-version: ['1.21', '1.22', '1.23']
     steps:
-      - uses: actions/checkout@v4
-      - name: Setup go
-        uses: actions/setup-go@v5
+      - uses: actions/checkout@v6
+      - uses: actions/setup-go@v6
         with:
-          go-version: ${{ matrix.go }}
-      - run: go run hello.go
+          go-version: ${{ matrix.go-version }}
+      - run: go test ./...
 ```
 
-### Supported version syntax
+## Advanced Configuration
+
+### Supported Version Syntax
 
 The `go-version` input supports the following syntax:
 
-- Specific versions: `1.15`, `1.16.1`, `1.17.0-rc.2`, `1.16.0-beta.1`
-- SemVer's version range syntax: `^1.13.1`, `>=1.18.0-rc.1`
+| Syntax Type | Example | Description |
+|-------------|---------|-------------|
+| Specific version | `1.23.2` | Installs this exact version |
+| Semantic range (caret) | `^1.23.0` | Allows newer minor/patch versions (1.24.x, 1.25.x, etc.) |
+| Semantic range (tilde) | `~1.23.0` | Allows newer patch versions only (1.23.1, 1.23.2, etc.) |
+| Comparison (gte) | `>=1.22.0` | Any version equal to or newer than specified |
+| Comparison (lt) | `<1.24.0` | Any version older than specified |
+| Comparison range | `>=1.22.0 <1.24.0` | Any version within the specified range |
+| Wildcard (patch) | `1.23.x` | Latest patch version of the specified minor release |
+| Wildcard (minor) | `1.*` | Latest available version in the major version |
+| Pre-release | `1.24.0-rc.1` | Beta/RC versions for testing upcoming releases |
+| Aliases | `stable`, `oldstable` | Latest stable or previous stable release |
 
-For more information about semantic versioning, please refer to [semver](https://github.com/npm/node-semver)
-documentation.
+For more information about semantic versioning, see the [semver documentation](https://semver.org/).
 
-## Using `setup-go` on GHES
-
-`setup-go` comes pre-installed on the appliance with GHES if Actions is enabled.
-When dynamically downloading Go distributions, `setup-go` downloads distributions from [`actions/go-versions`](https://github.com/actions/go-versions) on github.com (outside of the appliance).
-
-These calls to `actions/go-versions` are made via unauthenticated requests, which are limited to [60 requests per hour per IP](https://docs.github.com/en/rest/overview/resources-in-the-rest-api#rate-limiting).
-If more requests are made within the time frame, then the action leverages the `raw API` to retrieve the version-manifest. This approach does not impose a rate limit and hence facilitates unrestricted consumption. This is particularly beneficial for GHES runners, which often share the same IP, to avoid the quick exhaustion of the unauthenticated rate limit.
-If that fails as well the action will try to download versions directly from https://storage.googleapis.com/golang.
-
-If that fails as well you can get a higher rate limit with [generating a personal access token on github.com](https://github.com/settings/tokens/new) and passing it as the `token` input to the action:
+### Complete Input Reference
 
 ```yaml
-uses: actions/setup-go@v5
-with:
-  token: ${{ secrets.GH_DOTCOM_TOKEN }}
-  go-version: '1.18'
+- uses: actions/setup-go@v6
+  with:
+    # Version or version range of Go to use
+    go-version: '1.23'
+    
+    # Path to go.mod, go.work, .go-version, or .tool-versions file
+    go-version-file: 'go.mod'
+    
+    # Check for latest version
+    check-latest: false
+    
+    # GitHub token for authentication
+    token: ${{ github.token }}
+    
+    # Enable/disable caching
+    cache: true
+    
+    # Path to dependency files for caching
+    cache-dependency-path: 'go.sum'
+    
+    # Architecture to install (auto-detected if not specified)
+    architecture: 'x64'
 ```
 
-If the runner is not able to access github.com, any Go versions requested during a workflow run must come from the runner's tool cache.
-See "[Setting up the tool cache on self-hosted runners without internet access](https://docs.github.com/en/enterprise-server@3.2/admin/github-actions/managing-access-to-actions-from-githubcom/setting-up-the-tool-cache-on-self-hosted-runners-without-internet-access)"
-for more information.
+## Using setup-go on GHES
 
-## Recommended permissions
+setup-go comes pre-installed on GHES when Actions is enabled. For dynamic Go version downloads, the action fetches distributions from the [go-versions repository](https://github.com/actions/go-versions/) on github.com (external to your appliance).
 
-When using the `setup-go` action in your GitHub Actions workflow, it is recommended to set the following permissions to ensure proper functionality:
+These calls to `actions/go-versions` are made via unauthenticated requests, which are limited to 60 requests per hour per IP. If more requests are made within the time frame, then the action leverages the raw API to retrieve the version-manifest. This approach does not impose a rate limit and hence facilitates unrestricted consumption. This is particularly beneficial for GHES runners, which often share the same IP, to avoid the quick exhaustion of the unauthenticated rate limit. If that fails as well the action will try to download versions directly from [go.dev](https://go.dev/dl).
+
+If that fails as well you can get a higher rate limit with generating a personal access token on github.com and passing it as the token input to the action:
+
+```yaml
+uses: actions/setup-go@v6
+with:
+  token: ${{ secrets.GH_DOTCOM_TOKEN }}
+  go-version: '1.23'
+```
+
+### Offline Runners
+
+For runners without github.com access, Go versions must be pre-cached in the runner's tool cache. See "[Setting up the tool cache on self-hosted runners without internet access](https://docs.github.com/en/enterprise-server@3.2/admin/github-actions/managing-access-to-actions-from-githubcom/setting-up-the-tool-cache-on-self-hosted-runners-without-internet-access)".
+
+## Recommended Permissions
+
+When using the setup-go action in your GitHub Actions workflow, it is recommended to set the following permissions to ensure proper functionality:
 
 ```yaml
 permissions:
-  contents: read # access to check out code and install dependencies
+  contents: read # Required to checkout code and install dependencies
 ```
 
-# License
+## License
 
-The scripts and documentation in this project are released under the [MIT License](LICENSE)
+The scripts and documentation in this project are released under the [MIT License](LICENSE).
 
-# Contributions
+## Contributions
 
-Contributions are welcome! See [Contributor's Guide](docs/contributors.md)
+Contributions are welcome! See our [Contributor's Guide](docs/contributors.md) for details.
 
 ## Code of Conduct
 
-:wave: Be nice. See [our code of conduct](CODE_OF_CONDUCT.md)
+👋 Be nice. See our [Code of Conduct](CODE_OF_CONDUCT.md).

__tests__/cache-restore.test.ts

@@ -1,94 +1,83 @@
 import * as cache from '@actions/cache';
 import * as core from '@actions/core';
 import * as glob from '@actions/glob';
+import fs from 'fs';
 
 import * as cacheRestore from '../src/cache-restore';
 import * as cacheUtils from '../src/cache-utils';
 import {PackageManagerInfo} from '../src/package-managers';
 
 describe('restoreCache', () => {
-  //Arrange
-  const hashFilesSpy = jest.spyOn(glob, 'hashFiles');
-  const getCacheDirectoryPathSpy = jest.spyOn(
-    cacheUtils,
-    'getCacheDirectoryPath'
-  );
-  const restoreCacheSpy = jest.spyOn(cache, 'restoreCache');
-  const infoSpy = jest.spyOn(core, 'info');
-  const setOutputSpy = jest.spyOn(core, 'setOutput');
+  let hashFilesSpy: jest.SpyInstance;
+  let getCacheDirectoryPathSpy: jest.SpyInstance;
+  let restoreCacheSpy: jest.SpyInstance;
+  let infoSpy: jest.SpyInstance;
+  let setOutputSpy: jest.SpyInstance;
 
   const versionSpec = '1.13.1';
   const packageManager = 'default';
   const cacheDependencyPath = 'path';
 
+  let originalWorkspace: string | undefined;
+
   beforeEach(() => {
+    originalWorkspace = process.env.GITHUB_WORKSPACE;
+    process.env.GITHUB_WORKSPACE = '/test/workspace';
+    //Arrange
+    hashFilesSpy = jest.spyOn(glob, 'hashFiles');
+    getCacheDirectoryPathSpy = jest.spyOn(cacheUtils, 'getCacheDirectoryPath');
+    restoreCacheSpy = jest.spyOn(cache, 'restoreCache');
+    infoSpy = jest.spyOn(core, 'info');
+    setOutputSpy = jest.spyOn(core, 'setOutput');
+
     getCacheDirectoryPathSpy.mockImplementation(
       (PackageManager: PackageManagerInfo) => {
-        return new Promise<string[]>(resolve => {
-          resolve(['cache_directory_path', 'cache_directory_path']);
-        });
+        return Promise.resolve([
+          'cache_directory_path',
+          'cache_directory_path'
+        ]);
       }
     );
   });
 
-  it('should throw if dependency file path is not valid', async () => {
-    //Arrange
-    hashFilesSpy.mockImplementation((somePath: string) => {
-      return new Promise<string>(resolve => {
-        resolve('');
-      });
-    });
+  afterEach(() => {
+    process.env.GITHUB_WORKSPACE = originalWorkspace;
+    jest.restoreAllMocks();
+  });
 
-    //Act + Assert
-    await expect(async () => {
-      await cacheRestore.restoreCache(
+  it('should throw if dependency file path is not valid', async () => {
+    // Arrange
+    hashFilesSpy.mockImplementation(() => Promise.resolve(''));
+    // Act + Assert
+    await expect(
+      cacheRestore.restoreCache(
         versionSpec,
         packageManager,
         cacheDependencyPath
-      );
-    }).rejects.toThrow(
+      )
+    ).rejects.toThrow(
       'Some specified paths were not resolved, unable to cache dependencies.'
     );
   });
 
-  it('should inform if cache hit is not occured', async () => {
-    //Arrange
-    hashFilesSpy.mockImplementation((somePath: string) => {
-      return new Promise<string>(resolve => {
-        resolve('file_hash');
-      });
-    });
-
-    restoreCacheSpy.mockImplementation(() => {
-      return new Promise<string>(resolve => {
-        resolve('');
-      });
-    });
-
-    //Act + Assert
+  it('should inform if cache hit is not occurred', async () => {
+    // Arrange
+    hashFilesSpy.mockImplementation(() => Promise.resolve('file_hash'));
+    restoreCacheSpy.mockImplementation(() => Promise.resolve(''));
+    // Act + Assert
     await cacheRestore.restoreCache(
       versionSpec,
       packageManager,
       cacheDependencyPath
     );
-    expect(infoSpy).toHaveBeenCalledWith(`Cache is not found`);
+    expect(infoSpy).toHaveBeenCalledWith('Cache is not found');
   });
 
-  it('should set output if cache hit is occured', async () => {
-    //Arrange
-    hashFilesSpy.mockImplementation((somePath: string) => {
-      return new Promise<string>(resolve => {
-        resolve('file_hash');
-      });
-    });
-
-    restoreCacheSpy.mockImplementation(() => {
-      return new Promise<string>(resolve => {
-        resolve('cache_key');
-      });
-    });
-
-    //Act + Assert
+  it('should set output if cache hit is occurred', async () => {
+    // Arrange
+    hashFilesSpy.mockImplementation(() => Promise.resolve('file_hash'));
+    restoreCacheSpy.mockImplementation(() => Promise.resolve('cache_key'));
+    // Act + Assert
     await cacheRestore.restoreCache(
       versionSpec,
       packageManager,
@@ -96,4 +85,18 @@ describe('restoreCache', () => {
     );
     expect(setOutputSpy).toHaveBeenCalledWith('cache-hit', true);
   });
+
+  it('should throw if dependency file is not found in workspace', async () => {
+    jest.spyOn(fs, 'readdirSync').mockReturnValue(['main.go'] as any);
+
+    await expect(
+      cacheRestore.restoreCache(
+        versionSpec,
+        packageManager
+        // No cacheDependencyPath
+      )
+    ).rejects.toThrow(
+      'Dependencies file is not found in /test/workspace. Supported file pattern: go.mod'
+    );
+  });
 });

__tests__/cache-utils.test.ts

@@ -47,7 +47,7 @@ describe('getPackageManagerInfo', () => {
     //Arrange
     const packageManagerName = 'default';
     const expectedResult = {
-      dependencyFilePattern: 'go.sum',
+      dependencyFilePattern: 'go.mod',
       cacheFolderCommandList: ['go env GOMODCACHE', 'go env GOCACHE']
     };
 
@@ -73,7 +73,7 @@ describe('getCacheDirectoryPath', () => {
   const getExecOutputSpy = jest.spyOn(exec, 'getExecOutput');
 
   const validPackageManager: PackageManagerInfo = {
-    dependencyFilePattern: 'go.sum',
+    dependencyFilePattern: 'go.mod',
     cacheFolderCommandList: ['go env GOMODCACHE', 'go env GOCACHE']
   };
 

__tests__/data/.go-version

@@ -0,0 +1 @@
+1.22.4

__tests__/data/.tool-versions

@@ -0,0 +1 @@
+golang 1.23.2

__tests__/setup-go.test.ts

@@ -129,6 +129,9 @@ describe('setup-go', () => {
   });
 
   afterEach(() => {
+    // clear out env var set during 'run'
+    delete process.env[im.GOTOOLCHAIN_ENV_VAR];
+
     //jest.resetAllMocks();
     jest.clearAllMocks();
     //jest.restoreAllMocks();
@@ -285,7 +288,7 @@ describe('setup-go', () => {
     expect(logSpy).toHaveBeenCalledWith(`Setup go version spec 1.13.0`);
   });
 
-  it('does not export any variables for Go versions >=1.9', async () => {
+  it('does not export GOROOT for Go versions >=1.9', async () => {
     inputs['go-version'] = '1.13.0';
     inSpy.mockImplementation(name => inputs[name]);
 
@@ -298,7 +301,7 @@ describe('setup-go', () => {
     });
 
     await main.run();
-    expect(vars).toStrictEqual({});
+    expect(vars).not.toHaveProperty('GOROOT');
   });
 
   it('exports GOROOT for Go versions <1.9', async () => {
@@ -314,9 +317,7 @@ describe('setup-go', () => {
     });
 
     await main.run();
-    expect(vars).toStrictEqual({
-      GOROOT: toolPath
-    });
+    expect(vars).toHaveProperty('GOROOT', toolPath);
   });
 
   it('finds a version of go already in the cache', async () => {
@@ -388,7 +389,7 @@ describe('setup-go', () => {
 
     const expPath = path.win32.join(toolPath, 'bin');
     expect(dlSpy).toHaveBeenCalledWith(
-      'https://storage.googleapis.com/golang/go1.13.1.windows-amd64.zip',
+      'https://go.dev/dl/go1.13.1.windows-amd64.zip',
       'C:\\temp\\go1.13.1.windows-amd64.zip',
       undefined
     );
@@ -865,6 +866,9 @@ exclude example.com/thismodule v1.3.0
 
 use .
 
+`;
+
+    const toolVersionsContents = `golang 1.23
 `;
 
     it('reads version from go.mod', async () => {
@@ -891,6 +895,18 @@ use .
       expect(logSpy).toHaveBeenCalledWith('matching 1.19...');
     });
 
+    it('reads version from .tool-versions', async () => {
+      inputs['go-version-file'] = '.tool-versions';
+      existsSpy.mockImplementation(() => true);
+      readFileSpy.mockImplementation(() => Buffer.from(toolVersionsContents));
+
+      await main.run();
+
+      expect(logSpy).toHaveBeenCalledWith('Setup go version spec 1.23');
+      expect(logSpy).toHaveBeenCalledWith('Attempting to download 1.23...');
+      expect(logSpy).toHaveBeenCalledWith('matching 1.23...');
+    });
+
     it('reads version from .go-version', async () => {
       inputs['go-version-file'] = '.go-version';
       existsSpy.mockImplementation(() => true);
@@ -945,7 +961,7 @@ use .
         const expectedUrl =
           platform === 'win32'
             ? `https://github.com/actions/go-versions/releases/download/${version}/go-${version}-${platform}-${arch}.${fileExtension}`
-            : `https://storage.googleapis.com/golang/go${version}.${osSpec}-${arch}.${fileExtension}`;
+            : `https://go.dev/dl/go${version}.${osSpec}-${arch}.${fileExtension}`;
 
         // ... but not in the local cache
         findSpy.mockImplementation(() => '');
@@ -989,4 +1005,104 @@ use .
       }
     );
   });
+
+  describe('go-version-file-toolchain', () => {
+    const goVersions = ['1.22.0', '1.21rc2', '1.18'];
+    const placeholderVersion = '1.19';
+    const buildGoMod = (
+      goVersion: string,
+      toolchainVersion: string
+    ) => `module example.com/mymodule
+
+go ${goVersion}
+
+toolchain go${toolchainVersion}
+
+require (
+	example.com/othermodule v1.2.3
+	example.com/thismodule v1.2.3
+	example.com/thatmodule v1.2.3
+)
+
+replace example.com/thatmodule => ../thatmodule
+exclude example.com/thismodule v1.3.0
+`;
+
+    const buildGoWork = (
+      goVersion: string,
+      toolchainVersion: string
+    ) => `go 1.19
+
+toolchain go${toolchainVersion}
+
+use .
+
+`;
+
+    goVersions.forEach(version => {
+      [
+        {
+          goVersionfile: 'go.mod',
+          fileContents: Buffer.from(buildGoMod(placeholderVersion, version)),
+          expected_version: version,
+          desc: 'from toolchain directive'
+        },
+        {
+          goVersionfile: 'go.work',
+          fileContents: Buffer.from(buildGoMod(placeholderVersion, version)),
+          expected_version: version,
+          desc: 'from toolchain directive'
+        },
+        {
+          goVersionfile: 'go.mod',
+          fileContents: Buffer.from(buildGoMod(placeholderVersion, version)),
+          gotoolchain_env: 'local',
+          expected_version: placeholderVersion,
+          desc: 'from go directive when GOTOOLCHAIN is local'
+        },
+        {
+          goVersionfile: 'go.work',
+          fileContents: Buffer.from(buildGoMod(placeholderVersion, version)),
+          gotoolchain_env: 'local',
+          expected_version: placeholderVersion,
+          desc: 'from go directive when GOTOOLCHAIN is local'
+        }
+      ].forEach(test => {
+        it(`reads version (${version}) in ${test.goVersionfile} ${test.desc}`, async () => {
+          inputs['go-version-file'] = test.goVersionfile;
+          if (test.gotoolchain_env !== undefined) {
+            process.env[im.GOTOOLCHAIN_ENV_VAR] = test.gotoolchain_env;
+          }
+          existsSpy.mockImplementation(() => true);
+          readFileSpy.mockImplementation(() => Buffer.from(test.fileContents));
+
+          await main.run();
+
+          expect(logSpy).toHaveBeenCalledWith(
+            `Setup go version spec ${test.expected_version}`
+          );
+          expect(logSpy).toHaveBeenCalledWith(
+            `Attempting to download ${test.expected_version}...`
+          );
+          expect(logSpy).toHaveBeenCalledWith(
+            `matching ${test.expected_version}...`
+          );
+        });
+      });
+    });
+  });
+
+  it('exports GOTOOLCHAIN and sets it in current process env', async () => {
+    inputs['go-version'] = '1.21.0';
+    inSpy.mockImplementation(name => inputs[name]);
+
+    const vars: {[key: string]: string} = {};
+    exportVarSpy.mockImplementation((name: string, val: string) => {
+      vars[name] = val;
+    });
+
+    await main.run();
+    expect(vars).toStrictEqual({GOTOOLCHAIN: 'local'});
+    expect(process.env).toHaveProperty('GOTOOLCHAIN', 'local');
+  });
 });

action.yml

@@ -5,7 +5,7 @@ inputs:
   go-version:
     description: 'The Go version to download (if necessary) and use. Supports semver spec and ranges. Be sure to enclose this option in single quotation marks.'
   go-version-file:
-    description: 'Path to the go.mod or go.work file.'
+    description: 'Path to the go.mod, go.work, .go-version, or .tool-versions file.'
   check-latest:
     description: 'Set this option to true if you want the action to always check for the latest available version that satisfies the version spec'
     default: false
@@ -16,7 +16,7 @@ inputs:
     description: Used to specify whether caching is needed. Set to true, if you'd like to enable caching.
     default: true
   cache-dependency-path:
-    description: 'Used to specify the path to a dependency file - go.sum'
+    description: 'Used to specify the path to a dependency file (e.g., go.mod, go.sum)'
   architecture:
     description: 'Target architecture for Go to use. Examples: x86, x64. Will use system architecture by default.'
 outputs:
@@ -25,7 +25,7 @@ outputs:
   cache-hit:
     description: 'A boolean value to indicate if a cache was hit'
 runs:
-  using: 'node20'
+  using: 'node24'
   main: 'dist/setup/index.js'
   post: 'dist/cache-save/index.js'
   post-if: success()

package.json

@@ -1,9 +1,12 @@
 {
   "name": "setup-go",
-  "version": "5.0.0",
+  "version": "6.2.0",
   "private": true,
   "description": "setup go action",
   "main": "lib/setup-go.js",
+  "engines": {
+    "node": ">=24.0.0"
+  },
   "scripts": {
     "build": "tsc && ncc build -o dist/setup src/setup-go.ts && ncc build -o dist/cache-save src/cache-save.ts",
     "format": "prettier --no-error-on-unmatched-pattern --config ./.prettierrc.js --write \"**/*.{ts,yml,yaml}\"",
@@ -25,24 +28,24 @@
   "author": "GitHub",
   "license": "MIT",
   "dependencies": {
-    "@actions/cache": "^4.0.3",
+    "@actions/cache": "^5.0.1",
     "@actions/core": "^1.11.1",
     "@actions/exec": "^1.1.1",
     "@actions/glob": "^0.5.0",
     "@actions/http-client": "^2.2.1",
     "@actions/io": "^1.0.2",
     "@actions/tool-cache": "^2.0.2",
-    "semver": "^7.6.3"
+    "semver": "^7.7.3"
   },
   "devDependencies": {
     "@types/jest": "^29.5.14",
-    "@types/node": "^20.11.28",
-    "@types/semver": "^7.5.8",
+    "@types/node": "^24.1.0",
+    "@types/semver": "^7.7.1",
     "@typescript-eslint/eslint-plugin": "^8.31.1",
     "@typescript-eslint/parser": "^8.35.1",
     "@vercel/ncc": "^0.38.1",
     "eslint": "^8.57.0",
-    "eslint-config-prettier": "^10.0.1",
+    "eslint-config-prettier": "^10.1.8",
     "eslint-plugin-jest": "^29.0.1",
     "eslint-plugin-node": "^11.1.0",
     "jest": "^29.7.0",

src/cache-restore.ts

@@ -55,8 +55,8 @@ const findDependencyFile = (packageManager: PackageManagerInfo) => {
   const workspace = process.env.GITHUB_WORKSPACE!;
   const rootContent = fs.readdirSync(workspace);
 
-  const goSumFileExists = rootContent.includes(dependencyFile);
-  if (!goSumFileExists) {
+  const goModFileExists = rootContent.includes(dependencyFile);
+  if (!goModFileExists) {
     throw new Error(
       `Dependencies file is not found in ${workspace}. Supported file pattern: ${dependencyFile}`
     );

src/cache-save.ts

@@ -15,6 +15,7 @@ process.on('uncaughtException', e => {
 // Added early exit to resolve issue with slow post action step:
 // - https://github.com/actions/setup-node/issues/878
 // https://github.com/actions/cache/pull/1217
+
 export async function run(earlyExit?: boolean) {
   try {
     const cacheInput = core.getBooleanInput('cache');

src/installer.ts

@@ -7,7 +7,10 @@ import * as sys from './system';
 import fs from 'fs';
 import os from 'os';
 import {StableReleaseAlias, isSelfHosted} from './utils';
+import {Architecture} from './types';
 
+export const GOTOOLCHAIN_ENV_VAR = 'GOTOOLCHAIN';
+export const GOTOOLCHAIN_LOCAL_VAL = 'local';
 const MANIFEST_REPO_OWNER = 'actions';
 const MANIFEST_REPO_NAME = 'go-versions';
 const MANIFEST_REPO_BRANCH = 'main';
@@ -15,6 +18,8 @@ const MANIFEST_URL = `https://raw.githubusercontent.com/${MANIFEST_REPO_OWNER}/$
 
 type InstallationType = 'dist' | 'manifest';
 
+const GOLANG_DOWNLOAD_URL = 'https://go.dev/dl/?mode=json&include=all';
+
 export interface IGoVersionFile {
   filename: string;
   // darwin, linux, windows
@@ -39,7 +44,7 @@ export async function getGo(
   versionSpec: string,
   checkLatest: boolean,
   auth: string | undefined,
-  arch = os.arch()
+  arch: Architecture = os.arch() as Architecture
 ) {
   let manifest: tc.IToolRelease[] | undefined;
   const osPlat: string = os.platform();
@@ -151,7 +156,7 @@ async function resolveVersionFromManifest(
   versionSpec: string,
   stable: boolean,
   auth: string | undefined,
-  arch: string,
+  arch: Architecture,
   manifest: tc.IToolRelease[] | undefined
 ): Promise<string | undefined> {
   try {
@@ -353,7 +358,7 @@ export async function getInfoFromManifest(
   versionSpec: string,
   stable: boolean,
   auth: string | undefined,
-  arch = os.arch(),
+  arch: Architecture = os.arch() as Architecture,
   manifest?: tc.IToolRelease[] | undefined
 ): Promise<IGoVersionInfo | null> {
   let info: IGoVersionInfo | null = null;
@@ -379,14 +384,14 @@ export async function getInfoFromManifest(
 
 async function getInfoFromDist(
   versionSpec: string,
-  arch: string
+  arch: Architecture
 ): Promise<IGoVersionInfo | null> {
   const version: IGoVersion | undefined = await findMatch(versionSpec, arch);
   if (!version) {
     return null;
   }
 
-  const downloadUrl = `https://storage.googleapis.com/golang/${version.files[0].filename}`;
+  const downloadUrl = `https://go.dev/dl/${version.files[0].filename}`;
 
   return <IGoVersionInfo>{
     type: 'dist',
@@ -398,7 +403,7 @@ async function getInfoFromDist(
 
 export async function findMatch(
   versionSpec: string,
-  arch = os.arch()
+  arch: Architecture = os.arch() as Architecture
 ): Promise<IGoVersion | undefined> {
   const archFilter = sys.getArch(arch);
   const platFilter = sys.getPlatform();
@@ -406,9 +411,8 @@ export async function findMatch(
   let result: IGoVersion | undefined;
   let match: IGoVersion | undefined;
 
-  const dlUrl = 'https://golang.org/dl/?mode=json&include=all';
   const candidates: IGoVersion[] | null = await module.exports.getVersionsDist(
-    dlUrl
+    GOLANG_DOWNLOAD_URL
   );
   if (!candidates) {
     throw new Error(`golang download url did not return results`);
@@ -495,19 +499,37 @@ export function parseGoVersionFile(versionFilePath: string): string {
     path.basename(versionFilePath) === 'go.mod' ||
     path.basename(versionFilePath) === 'go.work'
   ) {
-    const match = contents.match(/^go (\d+(\.\d+)*)/m);
-    return match ? match[1] : '';
+    // for backwards compatibility: use version from go directive if
+    // 'GOTOOLCHAIN' has been explicitly set
+    if (process.env[GOTOOLCHAIN_ENV_VAR] !== GOTOOLCHAIN_LOCAL_VAL) {
+      // toolchain directive: https://go.dev/ref/mod#go-mod-file-toolchain
+      const matchToolchain = contents.match(
+        /^toolchain go(1\.\d+(?:\.\d+|rc\d+)?)/m
+      );
+      if (matchToolchain) {
+        return matchToolchain[1];
+      }
+    }
+
+    // go directive: https://go.dev/ref/mod#go-mod-file-go
+    const matchGo = contents.match(/^go (\d+(\.\d+)*)/m);
+    return matchGo ? matchGo[1] : '';
+  } else if (path.basename(versionFilePath) === '.tool-versions') {
+    const match = contents.match(/^golang\s+([^\n#]+)/m);
+    return match ? match[1].trim() : '';
   }
 
   return contents.trim();
 }
 
-async function resolveStableVersionDist(versionSpec: string, arch: string) {
+async function resolveStableVersionDist(
+  versionSpec: string,
+  arch: Architecture
+) {
   const archFilter = sys.getArch(arch);
   const platFilter = sys.getPlatform();
-  const dlUrl = 'https://golang.org/dl/?mode=json&include=all';
   const candidates: IGoVersion[] | null = await module.exports.getVersionsDist(
-    dlUrl
+    GOLANG_DOWNLOAD_URL
   );
   if (!candidates) {
     throw new Error(`golang download url did not return results`);

src/main.ts

@@ -8,6 +8,7 @@ import {isCacheFeatureAvailable} from './cache-utils';
 import cp from 'child_process';
 import fs from 'fs';
 import os from 'os';
+import {Architecture} from './types';
 
 export async function run() {
   try {
@@ -16,14 +17,15 @@ export async function run() {
     // If not supplied then problem matchers will still be setup.  Useful for self-hosted.
     //
     const versionSpec = resolveVersionInput();
+    setGoToolchain();
 
     const cache = core.getBooleanInput('cache');
     core.info(`Setup go version spec ${versionSpec}`);
 
-    let arch = core.getInput('architecture');
+    let arch = core.getInput('architecture') as Architecture;
 
     if (!arch) {
-      arch = os.arch();
+      arch = os.arch() as Architecture;
     }
 
     if (versionSpec) {
@@ -160,3 +162,20 @@ function resolveVersionInput(): string {
 
   return version;
 }
+
+function setGoToolchain() {
+  // docs: https://go.dev/doc/toolchain
+  // "local indicates the bundled Go toolchain (the one that shipped with the go command being run)"
+  // this is so any 'go' command is run with the selected Go version
+  // and doesn't trigger a toolchain download and run commands with that
+  // see e.g. issue #424
+  // and a similar discussion: https://github.com/docker-library/golang/issues/472.
+  // Set the value in process env so any `go` commands run as child-process
+  // don't cause toolchain downloads
+  process.env[installer.GOTOOLCHAIN_ENV_VAR] = installer.GOTOOLCHAIN_LOCAL_VAL;
+  // and in the runner env so e.g. a user running `go mod tidy` won't cause it
+  core.exportVariable(
+    installer.GOTOOLCHAIN_ENV_VAR,
+    installer.GOTOOLCHAIN_LOCAL_VAL
+  );
+}

src/package-managers.ts

@@ -9,7 +9,7 @@ export interface PackageManagerInfo {
 
 export const supportedPackageManagers: SupportedPackageManagers = {
   default: {
-    dependencyFilePattern: 'go.sum',
+    dependencyFilePattern: 'go.mod',
     cacheFolderCommandList: ['go env GOMODCACHE', 'go env GOCACHE']
   }
 };

src/system.ts

@@ -1,4 +1,5 @@
 import os from 'os';
+import {Architecture} from './types';
 
 export function getPlatform(): string {
   // darwin and linux match already
@@ -15,7 +16,7 @@ export function getPlatform(): string {
   return plat;
 }
 
-export function getArch(arch: string): string {
+export function getArch(arch: Architecture): string {
   // 'arm', 'arm64', 'ia32', 'mips', 'mipsel', 'ppc', 'ppc64', 's390', 's390x', 'x32', and 'x64'.
 
   // wants amd64, 386, arm64, armv61, ppc641e, s390x

src/types.ts

@@ -0,0 +1,2 @@
+// match what @actions/tool-cache expects
+export type Architecture = string;