Update self-hosted environment validation and bump undici version (#556)

* Fix self-hosted environment check

* Update isSelfHosted logic

.eslintignore

@@ -0,0 +1,6 @@
+# Ignore list
+/*
+
+# Do not ignore these folders:
+!__tests__/
+!src/

.eslintrc.js

@@ -0,0 +1,51 @@
+// This is a reusable configuration file copied from https://github.com/actions/reusable-workflows/tree/main/reusable-configurations. Please don't make changes to this file as it's the subject of an automatic update.
+module.exports = {
+  extends: [
+    'eslint:recommended',
+    'plugin:@typescript-eslint/recommended',
+    'plugin:eslint-plugin-jest/recommended',
+    'eslint-config-prettier'
+  ],
+  parser: '@typescript-eslint/parser',
+  plugins: ['@typescript-eslint', 'eslint-plugin-node', 'eslint-plugin-jest'],
+  rules: {
+    '@typescript-eslint/no-require-imports': 'error',
+    '@typescript-eslint/no-non-null-assertion': 'off',
+    '@typescript-eslint/no-explicit-any': 'off',
+    '@typescript-eslint/no-empty-function': 'off',
+    '@typescript-eslint/ban-ts-comment': [
+      'error',
+      {
+        'ts-ignore': 'allow-with-description'
+      }
+    ],
+    'no-console': 'error',
+    'yoda': 'error',
+    'prefer-const': [
+      'error',
+      {
+        destructuring: 'all'
+      }
+    ],
+    'no-control-regex': 'off',
+    'no-constant-condition': ['error', {checkLoops: false}],
+    'node/no-extraneous-import': 'error'
+  },
+  overrides: [
+    {
+      files: ['**/*{test,spec}.ts'],
+      rules: {
+        '@typescript-eslint/no-unused-vars': 'off',
+        'jest/no-standalone-expect': 'off',
+        'jest/no-conditional-expect': 'off',
+        'no-console': 'off',
+
+      }
+    }
+  ],
+  env: {
+    node: true,
+    es6: true,
+    'jest/globals': true
+  }
+};

.gitattributes

@@ -0,0 +1,2 @@
+* text=auto eol=lf
+.licenses/** -diff linguist-generated=true

.github/ISSUE_TEMPLATE/bug_report.md

@@ -0,0 +1,38 @@
+---
+name: Bug report
+about: Create a bug report
+title: ''
+labels: bug, needs triage
+assignees: ''
+
+---
+
+<!--- Please direct any generic questions related to actions to our support community forum at https://github.community/c/code-to-cloud/github-actions/41 --->
+<!--- Before opening up a new bug report, please make sure to check for similar existing issues -->
+
+**Description:**
+A clear and concise description of what the bug is.
+
+**Action version:**
+Specify the action version
+
+**Platform:**
+- [ ] Ubuntu
+- [ ] macOS
+- [ ] Windows
+
+**Runner type:**
+- [ ] Hosted
+- [ ] Self-hosted
+
+**Tools version:**
+<!--- Please specify go version -->
+
+**Repro steps:**  
+A description with steps to reproduce the issue. If your have a public example or repo to share, please provide the link.
+
+**Expected behavior:**
+A description of what you expected to happen.
+
+**Actual behavior:**
+A description of what is actually happening.

.github/ISSUE_TEMPLATE/config.yml

@@ -0,0 +1 @@
+blank_issues_enabled: false

.github/ISSUE_TEMPLATE/feature_request.md

@@ -0,0 +1,18 @@
+---
+name: Feature request
+about: Suggest an idea for this project
+title: ''
+labels: feature request, needs triage
+assignees: ''
+---
+<!--- Please direct any generic questions related to actions to our support community forum at https://github.community/c/code-to-cloud/github-actions/41 --->
+<!--- Before opening up a new feature request, please make sure to check for similar existing issues and pull requests -->
+
+**Description:**
+Describe your proposal.
+
+**Justification:**
+Justification or a use case for your proposal.
+
+**Are you willing to submit a PR?**
+<!--- We accept contributions! -->

.github/dependabot.yml

@@ -0,0 +1,22 @@
+# To get started with Dependabot version updates, you'll need to specify which
+# package ecosystems to update and where the package manifests are located.
+# Please see the documentation for all configuration options:
+# https://docs.github.com/code-security/dependabot/dependabot-version-updates/configuration-options-for-the-dependabot.yml-file
+
+version: 2
+updates:
+  # Enable version updates for npm
+  - package-ecosystem: 'npm'
+    # Look for `package.json` and `lock` files in the `root` directory
+    directory: '/'
+    # Check the npm registry for updates every day (weekdays)
+    schedule:
+      interval: 'weekly'
+
+  # Enable version updates for GitHub Actions
+  - package-ecosystem: 'github-actions'
+    # Workflow files stored in the default location of `.github/workflows`
+    # You don't need to specify `/.github/workflows` for `directory`. You can use `directory: "/"`.
+    directory: '/'
+    schedule:
+      interval: 'weekly'

.github/go.json

@@ -1,16 +0,0 @@
-{
-    "problemMatcher": [
-        {
-            "owner": "go",
-            "pattern": [
-                {
-                    "regexp": "^([^:]*: )?((.:)?[^:]*):(\\d+)(:(\\d+))?: (.*)$",
-                    "file": 2,
-                    "line": 4,
-                    "column": 6,
-                    "message": 7
-                }
-            ]
-        }
-    ]
-}

.github/pull_request_template.md

@@ -0,0 +1,9 @@
+**Description:**
+Describe your changes.
+
+**Related issue:**
+Add link to the related issue.
+
+**Check list:**
+- [ ] Mark if documentation changes are required.
+- [ ] Mark if tests were added or updated to cover the changes.

.github/workflows/basic-validation.yml

@@ -0,0 +1,18 @@
+name: Basic validation
+
+on:
+  push:
+    branches:
+      - main
+    paths-ignore:
+      - '**.md'
+  pull_request:
+    paths-ignore:
+      - '**.md'
+
+jobs:
+  call-basic-validation:
+    name: Basic validation
+    uses: actions/reusable-workflows/.github/workflows/basic-validation.yml@main
+    with:
+      node-version: '20'

.github/workflows/check-dist.yml

@@ -0,0 +1,19 @@
+name: Check dist/
+
+on:
+  push:
+    branches:
+      - main
+    paths-ignore:
+      - '**.md'
+  pull_request:
+    paths-ignore:
+      - '**.md'
+  workflow_dispatch:
+
+jobs:
+  call-check-dist:
+    name: Check dist/
+    uses: actions/reusable-workflows/.github/workflows/check-dist.yml@main
+    with:
+      node-version: '20'

.github/workflows/codeql-analysis.yml

@@ -0,0 +1,14 @@
+name: CodeQL analysis
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+    branches: [main]
+  schedule:
+    - cron: '0 3 * * 0'
+
+jobs:
+  call-codeQL-analysis:
+    name: CodeQL analysis
+    uses: actions/reusable-workflows/.github/workflows/codeql-analysis.yml@main

.github/workflows/licensed.yml

@@ -0,0 +1,14 @@
+name: Licensed
+
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+    branches:
+      - main
+
+jobs:
+  call-licensed:
+    name: Licensed
+    uses: actions/reusable-workflows/.github/workflows/licensed.yml@main

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

@@ -0,0 +1,20 @@
+name: 'Publish Immutable Action Version'
+
+on:
+  release:
+    types: [published]
+
+jobs:
+  publish:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      id-token: write
+      packages: write
+
+    steps:
+      - name: Checking out
+        uses: actions/checkout@v4
+      - name: Publish
+        id: publish
+        uses: actions/publish-immutable-action@v0.0.4

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

@@ -0,0 +1,28 @@
+name: Release new action version
+
+on:
+  release:
+    types: [released]
+  workflow_dispatch:
+    inputs:
+      TAG_NAME:
+        description: 'Tag name that the major tag will point to'
+        required: true
+
+env:
+  TAG_NAME: ${{ github.event.inputs.TAG_NAME || github.event.release.tag_name }}
+permissions:
+  contents: write
+
+jobs:
+  update_tag:
+    name: Update the major tag to include the ${{ github.event.inputs.TAG_NAME || github.event.release.tag_name }} changes
+    environment:
+      name: releaseNewActionVersion
+    runs-on: ubuntu-latest
+    steps:
+      - name: Update the ${{ env.TAG_NAME }} tag
+        uses: actions/publish-action@v0.3.0
+        with:
+          source-tag: ${{ env.TAG_NAME }}
+          slack-webhook: ${{ secrets.SLACK_WEBHOOK }}

.github/workflows/update-config-files.yml

@@ -0,0 +1,11 @@
+name: Update configuration files
+
+on:
+  schedule:
+    - cron: '0 3 * * 0'
+  workflow_dispatch:
+
+jobs:
+  call-update-configuration-files:
+    name: Update configuration files
+    uses: actions/reusable-workflows/.github/workflows/update-config-files.yml@main

.github/workflows/versions.yml

@@ -0,0 +1,209 @@
+name: Validate 'setup-go'
+
+on:
+  push:
+    branches:
+      - main
+    paths-ignore:
+      - '**.md'
+  pull_request:
+    paths-ignore:
+      - '**.md'
+  schedule:
+    - cron: 0 0 * * *
+
+jobs:
+  stable:
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [ubuntu-latest, windows-latest, macos-latest, macos-13]
+    steps:
+      - uses: actions/checkout@v4
+      - name: Setup Go Stable
+        uses: ./
+        with:
+          go-version: stable
+      - name: Verify Go
+        run: go version
+
+  oldstable:
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [ubuntu-latest, windows-latest, macos-latest, macos-13]
+    steps:
+      - uses: actions/checkout@v4
+      - name: Setup Go oldStable
+        uses: ./
+        with:
+          go-version: oldstable
+      - name: Verify Go
+        run: go version
+
+  aliases-arch:
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [ubuntu-latest, windows-latest, macos-latest, macos-13]
+        version: [stable, oldstable]
+        architecture: [x64, x32]
+        exclude:
+          - os: macos-latest
+            architecture: x32
+          - os: macos-13
+            architecture: x32
+    steps:
+      - uses: actions/checkout@v4
+      - name: Setup Go ${{ matrix.version }} ${{ matrix.architecture }}
+        uses: ./
+        with:
+          go-version: ${{ matrix.version }}
+          architecture: ${{ matrix.architecture }}
+      - name: Verify Go
+        run: go version
+
+  local-cache:
+    name: Setup local-cache version
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [macos-latest, windows-latest, ubuntu-latest, macos-13]
+        go: [1.21.13, 1.22.8, 1.23.2]
+        include:
+          - os: windows-latest
+            go: 1.20.14
+        exclude:
+          - os: windows-latest
+            go: 1.23.2
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: setup-go ${{ matrix.go }}
+        uses: ./
+        with:
+          go-version: ${{ matrix.go }}
+
+      - name: verify go
+        run: __tests__/verify-go.sh ${{ matrix.go }}
+        shell: bash
+
+  check-latest:
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [ubuntu-latest, windows-latest, macos-latest, macos-13]
+        go-version: ['1.20', '1.21', '1.22', '1.23']
+    steps:
+      - uses: actions/checkout@v4
+      - name: Setup Go and check latest
+        uses: ./
+        with:
+          go-version: ${{ matrix.go-version }}
+          check-latest: true
+      - name: Verify Go
+        run: go version
+
+  go-version-file:
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [ubuntu-latest, windows-latest, macos-latest, macos-13]
+    steps:
+      - uses: actions/checkout@v4
+      - name: Setup Go and check latest
+        uses: ./
+        with:
+          go-version-file: __tests__/data/go.mod
+      - name: verify go
+        run: __tests__/verify-go.sh 1.20.14
+        shell: bash
+
+  go-version-file-with-gowork:
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [ubuntu-latest, windows-latest, macos-latest, macos-13]
+    steps:
+      - uses: actions/checkout@v4
+      - name: Setup Go and check latest
+        uses: ./
+        with:
+          go-version-file: __tests__/data/go.work
+      - name: verify go
+        run: __tests__/verify-go.sh 1.21
+        shell: bash
+
+  setup-versions-from-manifest:
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [macos-latest, windows-latest, ubuntu-latest, macos-13]
+        go: [1.20.14, 1.21.10, 1.22.8, 1.23.2]
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: setup-go ${{ matrix.go }}
+        uses: ./
+        with:
+          go-version: ${{ matrix.go }}
+
+      - name: verify go
+        run: __tests__/verify-go.sh ${{ matrix.go }}
+        shell: bash
+
+  setup-versions-from-dist:
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [windows-latest, ubuntu-latest, macos-13]
+        go: [1.11.12]
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: setup-go ${{ matrix.go }}
+        uses: ./
+        with:
+          go-version: ${{ matrix.go }}
+
+      - name: verify go
+        run: __tests__/verify-go.sh ${{ matrix.go }}
+        shell: bash
+
+  architecture:
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [ubuntu-latest, windows-latest, macos-latest, macos-13]
+        go-version: [1.20.14, 1.21, 1.22, 1.23]
+        include:
+          - os: macos-latest
+            architecture: arm64
+          - os: ubuntu-latest
+            architecture: x64
+          - os: windows-latest
+            architecture: x64
+          - os: macos-13
+            architecture: x64
+    steps:
+      - uses: actions/checkout@v4
+      - name: Setup Go and check latest
+        uses: ./
+        with:
+          go-version: ${{ matrix.go-version }}
+          architecture: ${{ matrix.architecture }}
+      - name: Verify Go
+        run: go version

.github/workflows/windows-validation.yml

@@ -0,0 +1,136 @@
+name: Validate Windows installation
+
+on:
+  push:
+    branches:
+      - main
+    paths-ignore:
+      - '**.md'
+  pull_request:
+    paths-ignore:
+      - '**.md'
+
+jobs:
+  create-link-if-not-default:
+    runs-on: windows-latest
+    name: 'Validate if symlink is created'
+    strategy:
+      matrix:
+        cache: [false, true]
+        go: [1.20.1]
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: 'Setup ${{ matrix.cache }}, cache: ${{ matrix.go }}'
+        uses: ./
+        with:
+          go-version: ${{ matrix.go }}
+          cache: ${{ matrix.cache }}
+
+      - name: 'Drive C: should have zero size link'
+        run: |
+          du -m -s 'C:\hostedtoolcache\windows\go\${{ matrix.go }}\x64'
+          # make sure drive c: contains only a link
+          size=$(du -m -s 'C:\hostedtoolcache\windows\go\${{ matrix.go }}\x64'|cut -f1 -d$'\t')
+          if [ $size -ne 0 ];then
+            echo 'Size of the link created on drive c: must be 0'
+            exit 1
+          fi
+        shell: bash
+
+      # Drive D: is small, take care the action does not eat up the space
+      - name: 'Drive D: space usage should be below 1G'
+        run: |
+          du -m -s 'D:\hostedtoolcache\windows\go\${{ matrix.go }}\x64'
+          size=$(du -m -s 'D:\hostedtoolcache\windows\go\${{ matrix.go }}\x64'|cut -f1 -d$'\t')
+          # make sure archive does not take lot of space
+          if [ $size -gt 999 ];then
+            echo 'Size of installed on drive d: go is too big';
+            exit 1
+          fi
+        shell: bash
+
+      # make sure the Go installation has not been changed to the end user
+      - name: Test paths and environments
+        run: |
+          echo $PATH
+          which go
+          go version
+          go env
+          if [ $(which go) != '/c/hostedtoolcache/windows/go/${{ matrix.go }}/x64/bin/go' ];then
+            echo 'which go should return "/c/hostedtoolcache/windows/go/${{ matrix.go }}/x64/bin/go"'
+            exit 1
+          fi
+          if [ $(go env GOROOT) != 'C:\hostedtoolcache\windows\go\${{ matrix.go }}\x64' ];then
+            echo 'go env GOROOT should return "C:\hostedtoolcache\windows\go\${{ matrix.go }}\x64"'
+            exit 1
+          fi
+        shell: bash
+
+  find-default-go:
+    name: 'Find default go version'
+    runs-on: windows-latest
+    outputs:
+      version: ${{ steps.goversion.outputs.version }}
+    steps:
+      - run: |
+          version=`go env GOVERSION|sed s/^go//`
+          echo "default go version: $version"
+          echo "version=$version" >> "$GITHUB_OUTPUT"
+        id: goversion
+        shell: bash
+
+  dont-create-link-if-default:
+    name: 'Validate if symlink is not created for default go'
+    runs-on: windows-latest
+    needs: find-default-go
+    strategy:
+      matrix:
+        cache: [false, true]
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: 'Setup default go, cache: ${{ matrix.cache }}'
+        uses: ./
+        with:
+          go-version: ${{ needs.find-default-go.outputs.version }}
+          cache: ${{ matrix.cache }}
+
+      - name: 'Drive C: should have Go installation, cache: ${{ matrix.cache}}'
+        run: |
+          size=$(du -m -s 'C:\hostedtoolcache\windows\go\${{ needs.find-default-go.outputs.version }}\x64'|cut -f1 -d$'\t')
+          if [ $size -eq 0 ];then
+            echo 'Size of the hosted go installed on drive c: must be above zero'
+            exit 1
+          fi
+        shell: bash
+
+      - name: 'Drive D: should not have Go installation, cache: ${{ matrix.cache }}'
+        run: |
+          if [ -e 'D:\hostedtoolcache\windows\go\${{ needs.find-default-go.outputs.version }}\x64' ];then
+            echo 'D:\hostedtoolcache\windows\go\${{ needs.find-default-go.outputs.version }}\x64 should not exist for hosted version of go';
+            exit 1
+          fi
+        shell: bash
+
+  hostedtoolcache:
+    name: 'Validate if hostedtoolcache works as expected'
+    runs-on: windows-latest
+    strategy:
+      matrix:
+        cache: [false]
+        go: [1.20.1]
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: 'Setup ${{ matrix.go }}, cache: ${{ matrix.cache }}'
+        uses: ./
+        with:
+          go-version: ${{ matrix.go }}
+          cache: ${{ matrix.cache }}
+
+      - name: 'Setup ${{ matrix.go }}, cache: ${{ matrix.cache }} (from hostedtoolcache)'
+        uses: ./
+        with:
+          go-version: ${{ matrix.go }}
+          cache: ${{ matrix.cache }}

.github/workflows/workflow.yml

@@ -1,26 +0,0 @@
-name: Main workflow
-on: [push]
-jobs:
-  run:
-    name: Run
-    runs-on: ${{ matrix.operating-system }}
-    strategy:
-      matrix:
-        operating-system: [ubuntu-latest, windows-latest]
-    steps:
-    - name: Checkout
-      uses: actions/checkout@master
-
-    - name: Set Node.js 10.x
-      uses: actions/setup-node@master
-      with:
-        version: 10.x
-
-    - name: npm install
-      run: npm install
-
-    - name: Lint
-      run: npm run format-check
-
-    - name: npm test
-      run: npm test

.gitignore

@@ -1,6 +1,5 @@
-# Explicitly not ignoring node_modules so that they are included in package downloaded by runner
-!node_modules/
-__tests__/runner/*
+node_modules/
+lib
 
 # Rest of the file pulled from https://github.com/github/gitignore/blob/master/Node.gitignore
 # Logs

.licensed.yml

@@ -0,0 +1,15 @@
+sources:
+  npm: true
+
+allowed:
+  - apache-2.0
+  - bsd-2-clause
+  - bsd-3-clause
+  - isc
+  - mit
+  - cc0-1.0
+  - unlicense
+  - 0bsd
+
+reviewed:
+  npm:

.prettierignore

@@ -0,0 +1,7 @@
+# Ignore list
+/*
+
+# Do not ignore these folders:
+!__tests__/
+!.github/
+!src/

.prettierrc.js

@@ -0,0 +1,11 @@
+// This is a reusable configuration file copied from https://github.com/actions/reusable-workflows/tree/main/reusable-configurations. Please don't make changes to this file as it's the subject of an automatic update.
+module.exports = {
+  printWidth: 80,
+  tabWidth: 2,
+  useTabs: false,
+  semi: true,
+  singleQuote: true,
+  trailingComma: 'none',
+  bracketSpacing: false,
+  arrowParens: 'avoid'
+};

.prettierrc.json

@@ -1,11 +0,0 @@
-{
-    "printWidth": 80,
-    "tabWidth": 2,
-    "useTabs": false,
-    "semi": true,
-    "singleQuote": true,
-    "trailingComma": "none",
-    "bracketSpacing": false,
-    "arrowParens": "avoid",
-    "parser": "typescript"
-  }

CODEOWNERS

@@ -0,0 +1 @@
+* @actions/setup-actions-team

CODE_OF_CONDUCT.md

@@ -0,0 +1,76 @@
+# Contributor Covenant Code of Conduct
+
+## Our Pledge
+
+In the interest of fostering an open and welcoming environment, we as
+contributors and maintainers pledge to make participation in our project and
+our community a harassment-free experience for everyone, regardless of age, body
+size, disability, ethnicity, sex characteristics, gender identity and expression,
+level of experience, education, socio-economic status, nationality, personal
+appearance, race, religion, or sexual identity and orientation.
+
+## Our Standards
+
+Examples of behavior that contributes to creating a positive environment
+include:
+
+* Using welcoming and inclusive language
+* Being respectful of differing viewpoints and experiences
+* Gracefully accepting constructive criticism
+* Focusing on what is best for the community
+* Showing empathy towards other community members
+
+Examples of unacceptable behavior by participants include:
+
+* The use of sexualized language or imagery and unwelcome sexual attention or
+  advances
+* Trolling, insulting/derogatory comments, and personal or political attacks
+* Public or private harassment
+* Publishing others' private information, such as a physical or electronic
+  address, without explicit permission
+* Other conduct which could reasonably be considered inappropriate in a
+  professional setting
+
+## Our Responsibilities
+
+Project maintainers are responsible for clarifying the standards of acceptable
+behavior and are expected to take appropriate and fair corrective action in
+response to any instances of unacceptable behavior.
+
+Project maintainers have the right and responsibility to remove, edit, or
+reject comments, commits, code, wiki edits, issues, and other contributions
+that are not aligned to this Code of Conduct, or to ban temporarily or
+permanently any contributor for other behaviors that they deem inappropriate,
+threatening, offensive, or harmful.
+
+## Scope
+
+This Code of Conduct applies within all project spaces, and it also applies when
+an individual is representing the project or its community in public spaces.
+Examples of representing a project or community include using an official
+project e-mail address, posting via an official social media account, or acting
+as an appointed representative at an online or offline event. Representation of
+a project may be further defined and clarified by project maintainers.
+
+## Enforcement
+
+Instances of abusive, harassing, or otherwise unacceptable behavior may be
+reported by contacting the project team at opensource+actions/setup-go@github.com. All
+complaints will be reviewed and investigated and will result in a response that
+is deemed necessary and appropriate to the circumstances. The project team is
+obligated to maintain confidentiality with regard to the reporter of an incident.
+Further details of specific enforcement policies may be posted separately.
+
+Project maintainers who do not follow or enforce the Code of Conduct in good
+faith may face temporary or permanent repercussions as determined by other
+members of the project's leadership.
+
+## Attribution
+
+This Code of Conduct is adapted from the [Contributor Covenant][homepage], version 1.4,
+available at https://www.contributor-covenant.org/version/1/4/code-of-conduct.html
+
+[homepage]: https://www.contributor-covenant.org
+
+For answers to common questions about this code of conduct, see
+https://www.contributor-covenant.org/faq

README.md

@@ -1,46 +1,276 @@
 # setup-go
 
-<p align="left">
-  <a href="https://github.com/actions/setup-go"><img alt="GitHub Actions status" src="https://github.com/actions/setup-go/workflows/Main%20workflow/badge.svg"></a>
-</p>
+[![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:
 
-- 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.
+
+# 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):
+
+```yaml
+steps:
+  - uses: actions/checkout@v4
+  - uses: actions/setup-go@v5
+    with:
+      go-version: '^1.13.1' # The Go version to download (if necessary) and use.
+  - run: go version
+```
+
+```yaml
+steps:
+  - uses: actions/checkout@v4
+  - uses: actions/setup-go@v5
+    with:
+      go-version: '>=1.17.0'
+  - run: go version
+```
+
+> **Note**: Due to the peculiarities of YAML parsing, it is recommended to wrap the version in single quotation marks:
+>
+> ```yaml
+>   go-version: '1.20'
+> ```
+>
+> 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:
+
+```yaml
+steps:
+  - uses: actions/checkout@v4
+  - uses: actions/setup-go@v5
+    with:
+      go-version: '1.18.0-rc.1' # The Go version to download (if necessary) and use.
+  - run: go version
+```
+
+```yaml
+steps:
+  - uses: actions/checkout@v4
+  - uses: actions/setup-go@v5
+    with:
+      go-version: '1.16.0-beta.1' # The Go version to download (if necessary) and use.
+  - run: go version
+```
 
 # Usage
 
 See [action.yml](action.yml)
 
-Basic:
+## Basic
+
 ```yaml
 steps:
-- uses: actions/checkout@master
-- uses: actions/setup-go@v1
+  - uses: actions/checkout@v4
+  - uses: actions/setup-go@v5
     with:
-    go-version: '1.9.3' # The Go version to download (if necessary) and use.
-- run: go run hello.go
+      go-version: '1.16.1' # The Go version to download (if necessary) and use.
+  - run: go run hello.go
 ```
 
-Matrix Testing:
+## Check latest version
+
+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.
+
+```yaml
+steps:
+  - uses: actions/checkout@v4
+  - uses: actions/setup-go@v5
+    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'
+      check-latest: true
+      cache-dependency-path: |
+             subdir/go.sum
+             tools/go.sum
+    # cache-dependency-path: "**/*.sum"
+
+  - run: go run hello.go
+  ```
+
+## Getting go version from the go.mod file
+
+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
+
+```yaml
+steps:
+  - uses: actions/checkout@v4
+  - uses: actions/setup-go@v5
+    with:
+      go-version-file: 'path/to/go.mod'
+  - run: go version
+```
+
+## Matrix testing
+
 ```yaml
 jobs:
   build:
-    runs-on: ubuntu-16.04
+    runs-on: ubuntu-latest
     strategy:
       matrix:
-        go: [ '1.8', '1.9.3', '1.10.x' ]
+        go: [ '1.14', '1.13' ]
     name: Go ${{ matrix.go }} sample
     steps:
-      - uses: actions/checkout@master
+      - uses: actions/checkout@v4
       - name: Setup go
-        uses: actions/setup-go@v1
+        uses: actions/setup-go@v5
         with:
           go-version: ${{ matrix.go }}
       - run: go run hello.go
 ```
 
+### 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`
+
+For more information about semantic versioning, please refer to [semver](https://github.com/npm/node-semver)
+documentation.
+
+## 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:
+
+```yaml
+uses: actions/setup-go@v5
+with:
+  token: ${{ secrets.GH_DOTCOM_TOKEN }}
+  go-version: '1.18'
+```
+
+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.
+
+## 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
+```
+
 # License
 
 The scripts and documentation in this project are released under the [MIT License](LICENSE)
@@ -48,3 +278,7 @@ The scripts and documentation in this project are released under the [MIT Licens
 # Contributions
 
 Contributions are welcome! See [Contributor's Guide](docs/contributors.md)
+
+## Code of Conduct
+
+:wave: Be nice. See [our code of conduct](CODE_OF_CONDUCT.md)

__tests__/cache-restore.test.ts

@@ -0,0 +1,99 @@
+import * as cache from '@actions/cache';
+import * as core from '@actions/core';
+import * as glob from '@actions/glob';
+
+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');
+
+  const versionSpec = '1.13.1';
+  const packageManager = 'default';
+  const cacheDependencyPath = 'path';
+
+  beforeEach(() => {
+    getCacheDirectoryPathSpy.mockImplementation(
+      (PackageManager: PackageManagerInfo) => {
+        return new Promise<string[]>(resolve => {
+          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('');
+      });
+    });
+
+    //Act + Assert
+    await expect(async () => {
+      await cacheRestore.restoreCache(
+        versionSpec,
+        packageManager,
+        cacheDependencyPath
+      );
+    }).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
+    await cacheRestore.restoreCache(
+      versionSpec,
+      packageManager,
+      cacheDependencyPath
+    );
+    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
+    await cacheRestore.restoreCache(
+      versionSpec,
+      packageManager,
+      cacheDependencyPath
+    );
+    expect(setOutputSpy).toHaveBeenCalledWith('cache-hit', true);
+  });
+});

__tests__/cache-utils.test.ts

@@ -0,0 +1,249 @@
+import * as exec from '@actions/exec';
+import * as cache from '@actions/cache';
+import * as core from '@actions/core';
+import * as cacheUtils from '../src/cache-utils';
+import {PackageManagerInfo} from '../src/package-managers';
+
+describe('getCommandOutput', () => {
+  //Arrange
+  const getExecOutputSpy = jest.spyOn(exec, 'getExecOutput');
+
+  it('should return trimmed stdout in case of successful exit code', async () => {
+    //Arrange
+    const stdoutResult = ' stdout ';
+    const trimmedStdout = stdoutResult.trim();
+
+    getExecOutputSpy.mockImplementation((commandLine: string) => {
+      return new Promise<exec.ExecOutput>(resolve => {
+        resolve({exitCode: 0, stdout: stdoutResult, stderr: ''});
+      });
+    });
+
+    //Act + Assert
+    return cacheUtils
+      .getCommandOutput('command')
+      .then(data => expect(data).toBe(trimmedStdout));
+  });
+
+  it('should return error in case of unsuccessful exit code', async () => {
+    //Arrange
+    const stderrResult = 'error message';
+
+    getExecOutputSpy.mockImplementation((commandLine: string) => {
+      return new Promise<exec.ExecOutput>(resolve => {
+        resolve({exitCode: 10, stdout: '', stderr: stderrResult});
+      });
+    });
+
+    //Act + Assert
+    await expect(async () => {
+      await cacheUtils.getCommandOutput('command');
+    }).rejects.toThrow();
+  });
+});
+
+describe('getPackageManagerInfo', () => {
+  it('should return package manager info in case of valid package manager name', async () => {
+    //Arrange
+    const packageManagerName = 'default';
+    const expectedResult = {
+      dependencyFilePattern: 'go.sum',
+      cacheFolderCommandList: ['go env GOMODCACHE', 'go env GOCACHE']
+    };
+
+    //Act + Assert
+    return cacheUtils
+      .getPackageManagerInfo(packageManagerName)
+      .then(data => expect(data).toEqual(expectedResult));
+  });
+
+  it('should throw the error in case of invalid package manager name', async () => {
+    //Arrange
+    const packageManagerName = 'invalidName';
+
+    //Act + Assert
+    await expect(async () => {
+      await cacheUtils.getPackageManagerInfo(packageManagerName);
+    }).rejects.toThrow();
+  });
+});
+
+describe('getCacheDirectoryPath', () => {
+  //Arrange
+  const getExecOutputSpy = jest.spyOn(exec, 'getExecOutput');
+
+  const validPackageManager: PackageManagerInfo = {
+    dependencyFilePattern: 'go.sum',
+    cacheFolderCommandList: ['go env GOMODCACHE', 'go env GOCACHE']
+  };
+
+  it('should return path to the cache folders which specified package manager uses', async () => {
+    //Arrange
+    getExecOutputSpy.mockImplementation((commandLine: string) => {
+      return new Promise<exec.ExecOutput>(resolve => {
+        resolve({exitCode: 0, stdout: 'path/to/cache/folder', stderr: ''});
+      });
+    });
+
+    const expectedResult = ['path/to/cache/folder', 'path/to/cache/folder'];
+
+    //Act + Assert
+    return cacheUtils
+      .getCacheDirectoryPath(validPackageManager)
+      .then(data => expect(data).toEqual(expectedResult));
+  });
+
+  it('should return path to the cache folder if one command return empty str', async () => {
+    //Arrange
+    getExecOutputSpy.mockImplementationOnce((commandLine: string) => {
+      return new Promise<exec.ExecOutput>(resolve => {
+        resolve({exitCode: 0, stdout: 'path/to/cache/folder', stderr: ''});
+      });
+    });
+
+    getExecOutputSpy.mockImplementationOnce((commandLine: string) => {
+      return new Promise<exec.ExecOutput>(resolve => {
+        resolve({exitCode: 0, stdout: '', stderr: ''});
+      });
+    });
+
+    const expectedResult = ['path/to/cache/folder'];
+
+    //Act + Assert
+    return cacheUtils
+      .getCacheDirectoryPath(validPackageManager)
+      .then(data => expect(data).toEqual(expectedResult));
+  });
+
+  it('should throw if the both commands return empty str', async () => {
+    getExecOutputSpy.mockImplementation((commandLine: string) => {
+      return new Promise<exec.ExecOutput>(resolve => {
+        resolve({exitCode: 10, stdout: '', stderr: ''});
+      });
+    });
+
+    //Act + Assert
+    await expect(async () => {
+      await cacheUtils.getCacheDirectoryPath(validPackageManager);
+    }).rejects.toThrow();
+  });
+
+  it('should throw if the specified package name is invalid', async () => {
+    getExecOutputSpy.mockImplementation((commandLine: string) => {
+      return new Promise<exec.ExecOutput>(resolve => {
+        resolve({exitCode: 10, stdout: '', stderr: 'Error message'});
+      });
+    });
+
+    //Act + Assert
+    await expect(async () => {
+      await cacheUtils.getCacheDirectoryPath(validPackageManager);
+    }).rejects.toThrow();
+  });
+});
+
+describe('isCacheFeatureAvailable', () => {
+  //Arrange
+  const isFeatureAvailableSpy = jest.spyOn(cache, 'isFeatureAvailable');
+  const warningSpy = jest.spyOn(core, 'warning');
+
+  it('should return true when cache feature is available', () => {
+    //Arrange
+    isFeatureAvailableSpy.mockImplementation(() => {
+      return true;
+    });
+
+    //Act
+    const functionResult = cacheUtils.isCacheFeatureAvailable();
+
+    //Assert
+    expect(functionResult).toBeTruthy();
+  });
+
+  it('should warn when cache feature is unavailable and GHES is not used', () => {
+    //Arrange
+    isFeatureAvailableSpy.mockImplementation(() => {
+      return false;
+    });
+
+    process.env['GITHUB_SERVER_URL'] = 'https://github.com';
+
+    const warningMessage =
+      'The runner was not able to contact the cache service. Caching will be skipped';
+
+    //Act
+    cacheUtils.isCacheFeatureAvailable();
+
+    //Assert
+    expect(warningSpy).toHaveBeenCalledWith(warningMessage);
+  });
+
+  it('should return false when cache feature is unavailable', () => {
+    //Arrange
+    isFeatureAvailableSpy.mockImplementation(() => {
+      return false;
+    });
+
+    process.env['GITHUB_SERVER_URL'] = 'https://github.com';
+
+    //Act
+    const functionResult = cacheUtils.isCacheFeatureAvailable();
+
+    //Assert
+    expect(functionResult).toBeFalsy();
+  });
+
+  it('should warn when cache feature is unavailable and GHES is used', () => {
+    //Arrange
+    isFeatureAvailableSpy.mockImplementation(() => {
+      return false;
+    });
+
+    process.env['GITHUB_SERVER_URL'] = 'https://nongithub.com';
+
+    const warningMessage =
+      'Cache action is only supported on GHES version >= 3.5. If you are on version >=3.5 Please check with GHES admin if Actions cache service is enabled or not.';
+
+    //Act + Assert
+    expect(cacheUtils.isCacheFeatureAvailable()).toBeFalsy();
+    expect(warningSpy).toHaveBeenCalledWith(warningMessage);
+  });
+});
+
+describe('isGhes', () => {
+  const pristineEnv = process.env;
+
+  beforeEach(() => {
+    jest.resetModules();
+    process.env = {...pristineEnv};
+  });
+
+  afterAll(() => {
+    process.env = pristineEnv;
+  });
+
+  it('returns false when the GITHUB_SERVER_URL environment variable is not defined', async () => {
+    delete process.env['GITHUB_SERVER_URL'];
+    expect(cacheUtils.isGhes()).toBeFalsy();
+  });
+
+  it('returns false when the GITHUB_SERVER_URL environment variable is set to github.com', async () => {
+    process.env['GITHUB_SERVER_URL'] = 'https://github.com';
+    expect(cacheUtils.isGhes()).toBeFalsy();
+  });
+
+  it('returns false when the GITHUB_SERVER_URL environment variable is set to a GitHub Enterprise Cloud-style URL', async () => {
+    process.env['GITHUB_SERVER_URL'] = 'https://contoso.ghe.com';
+    expect(cacheUtils.isGhes()).toBeFalsy();
+  });
+
+  it('returns false when the GITHUB_SERVER_URL environment variable has a .localhost suffix', async () => {
+    process.env['GITHUB_SERVER_URL'] = 'https://mock-github.localhost';
+    expect(cacheUtils.isGhes()).toBeFalsy();
+  });
+
+  it('returns true when the GITHUB_SERVER_URL environment variable is set to some other URL', async () => {
+    process.env['GITHUB_SERVER_URL'] = 'https://src.onpremise.fabrikam.com';
+    expect(cacheUtils.isGhes()).toBeTruthy();
+  });
+});

__tests__/data/go.mod

@@ -0,0 +1,12 @@
+module example.com/mymodule
+
+go 1.20
+
+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

__tests__/data/go.work

@@ -0,0 +1,3 @@
+go 1.21
+
+use .

__tests__/data/versions-manifest.json

@@ -0,0 +1,102 @@
+[
+    {
+      "version": "1.17.6",
+      "stable": true,
+      "release_url": "https://github.com/actions/go-versions/releases/tag/1.17.6-1668090892",
+      "files": [
+        {
+          "filename": "go-1.17.6-darwin-x64.tar.gz",
+          "arch": "x64",
+          "platform": "darwin",
+          "download_url": "https://github.com/actions/go-versions/releases/download/1.17.6-1668090892/go-1.17.6-darwin-x64.tar.gz"
+        },
+        {
+          "filename": "go-1.17.6-linux-x64.tar.gz",
+          "arch": "x64",
+          "platform": "linux",
+          "download_url": "https://github.com/actions/go-versions/releases/download/1.17.6-1668090892/go-1.17.6-linux-x64.tar.gz"
+        },
+        {
+          "filename": "go-1.17.6-win32-x64.zip",
+          "arch": "x64",
+          "platform": "win32",
+          "download_url": "https://github.com/actions/go-versions/releases/download/1.17.6-1668090892/go-1.17.6-win32-x64.zip"
+        }
+      ]
+    },
+    {
+      "version": "1.12.17",
+      "stable": true,
+      "release_url": "https://github.com/actions/go-versions/releases/tag/1.12.17-20200616.21",
+      "files": [
+        {
+          "filename": "go-1.12.17-darwin-x64.tar.gz",
+          "arch": "x64",
+          "platform": "darwin",
+          "download_url": "https://github.com/actions/go-versions/releases/download/1.12.17-20200616.21/go-1.12.17-darwin-x64.tar.gz"
+        },
+        {
+          "filename": "go-1.12.17-linux-x64.tar.gz",
+          "arch": "x64",
+          "platform": "linux",
+          "download_url": "https://github.com/actions/go-versions/releases/download/1.12.17-20200616.21/go-1.12.17-linux-x64.tar.gz"
+        },
+        {
+          "filename": "go-1.12.17-win32-x64.zip",
+          "arch": "x64",
+          "platform": "win32",
+          "download_url": "https://github.com/actions/go-versions/releases/download/1.12.17-20200616.21/go-1.12.17-win32-x64.zip"
+        }
+      ]
+    },
+    {
+      "version": "1.12.16",
+      "stable": true,
+      "release_url": "https://github.com/actions/go-versions/releases/tag/1.12.16-20200616.20",
+      "files": [
+        {
+          "filename": "go-1.12.16-darwin-x64.tar.gz",
+          "arch": "x64",
+          "platform": "darwin",
+          "download_url": "https://github.com/actions/go-versions/releases/download/1.12.16-20200616.20/go-1.12.16-darwin-x64.tar.gz"
+        },
+        {
+          "filename": "go-1.12.16-linux-x64.tar.gz",
+          "arch": "x64",
+          "platform": "linux",
+          "download_url": "https://github.com/actions/go-versions/releases/download/1.12.16-20200616.20/go-1.12.16-linux-x64.tar.gz"
+        },
+        {
+          "filename": "go-1.12.16-win32-x64.zip",
+          "arch": "x64",
+          "platform": "win32",
+          "download_url": "https://github.com/actions/go-versions/releases/download/1.12.16-20200616.20/go-1.12.16-win32-x64.zip"
+        }
+      ]
+    },
+    {
+      "version": "1.9.7",
+      "stable": true,
+      "release_url": "https://github.com/actions/go-versions/releases/tag/1.9.7-20200616.1",
+      "files": [
+        {
+          "filename": "go-1.9.7-darwin-x64.tar.gz",
+          "arch": "x64",
+          "platform": "darwin",
+          "download_url": "https://github.com/actions/go-versions/releases/download/1.9.7/go-1.9.7-darwin-x64.tar.gz"
+        },
+        {
+          "filename": "go-1.9.7-linux-x64.tar.gz",
+          "arch": "x64",
+          "platform": "linux",
+          "download_url": "https://github.com/actions/go-versions/releases/download/1.9.7/go-1.9.7-linux-x64.tar.gz"
+        },
+        {
+          "filename": "go-1.9.7-win32-x64.zip",
+          "arch": "x64",
+          "platform": "win32",
+          "download_url": "https://github.com/actions/go-versions/releases/download/1.9.7/go-1.9.7-win32-x64.zip"
+        }
+      ]
+    }
+  ]

__tests__/installer.test.ts

@@ -1,125 +0,0 @@
-import io = require('@actions/io');
-import fs = require('fs');
-import os = require('os');
-import path = require('path');
-import nock = require('nock');
-
-const toolDir = path.join(__dirname, 'runner', 'tools');
-const tempDir = path.join(__dirname, 'runner', 'temp');
-const dataDir = path.join(__dirname, 'data');
-
-process.env['RUNNER_TOOL_CACHE'] = toolDir;
-process.env['RUNNER_TEMP'] = tempDir;
-import * as installer from '../src/installer';
-
-const IS_WINDOWS = process.platform === 'win32';
-
-describe('installer tests', () => {
-  beforeAll(async () => {
-    await io.rmRF(toolDir);
-    await io.rmRF(tempDir);
-  }, 100000);
-
-  afterAll(async () => {
-    try {
-      await io.rmRF(toolDir);
-      await io.rmRF(tempDir);
-    } catch {
-      console.log('Failed to remove test directories');
-    }
-  }, 100000);
-
-  it('Acquires version of go if no matching version is installed', async () => {
-    await installer.getGo('1.10.8');
-    const goDir = path.join(toolDir, 'go', '1.10.8', os.arch());
-
-    expect(fs.existsSync(`${goDir}.complete`)).toBe(true);
-    if (IS_WINDOWS) {
-      expect(fs.existsSync(path.join(goDir, 'bin', 'go.exe'))).toBe(true);
-    } else {
-      expect(fs.existsSync(path.join(goDir, 'bin', 'go'))).toBe(true);
-    }
-  }, 100000);
-
-  describe('the latest release of a go version', () => {
-    beforeEach(() => {
-      nock('https://api.github.com')
-        .get('/repos/golang/go/git/refs/tags')
-        .replyWithFile(200, path.join(dataDir, 'golang-tags.json'));
-    });
-
-    afterEach(() => {
-      nock.cleanAll();
-      nock.enableNetConnect();
-    });
-
-    it('Acquires latest release version of go 1.10 if using 1.10 and no matching version is installed', async () => {
-      await installer.getGo('1.10');
-      const goDir = path.join(toolDir, 'go', '1.10.8', os.arch());
-
-      expect(fs.existsSync(`${goDir}.complete`)).toBe(true);
-      if (IS_WINDOWS) {
-        expect(fs.existsSync(path.join(goDir, 'bin', 'go.exe'))).toBe(true);
-      } else {
-        expect(fs.existsSync(path.join(goDir, 'bin', 'go'))).toBe(true);
-      }
-    }, 100000);
-
-    it('Acquires latest release version of go 1.10 if using 1.10.x and no matching version is installed', async () => {
-      await installer.getGo('1.10.x');
-      const goDir = path.join(toolDir, 'go', '1.10.8', os.arch());
-
-      expect(fs.existsSync(`${goDir}.complete`)).toBe(true);
-      if (IS_WINDOWS) {
-        expect(fs.existsSync(path.join(goDir, 'bin', 'go.exe'))).toBe(true);
-      } else {
-        expect(fs.existsSync(path.join(goDir, 'bin', 'go'))).toBe(true);
-      }
-    }, 100000);
-
-    it('Acquires latest release version of go if using 1.x and no matching version is installed', async () => {
-      await installer.getGo('1.x');
-      const goDir = path.join(toolDir, 'go', '1.13.0-beta1', os.arch());
-
-      expect(fs.existsSync(`${goDir}.complete`)).toBe(true);
-      if (IS_WINDOWS) {
-        expect(fs.existsSync(path.join(goDir, 'bin', 'go.exe'))).toBe(true);
-      } else {
-        expect(fs.existsSync(path.join(goDir, 'bin', 'go'))).toBe(true);
-      }
-    }, 100000);
-  });
-
-  it('Throws if no location contains correct go version', async () => {
-    let thrown = false;
-    try {
-      await installer.getGo('1000.0');
-    } catch {
-      thrown = true;
-    }
-    expect(thrown).toBe(true);
-  });
-
-  it('Uses version of go installed in cache', async () => {
-    const goDir: string = path.join(toolDir, 'go', '250.0.0', os.arch());
-    await io.mkdirP(goDir);
-    fs.writeFileSync(`${goDir}.complete`, 'hello');
-    // This will throw if it doesn't find it in the cache (because no such version exists)
-    await installer.getGo('250.0');
-    return;
-  });
-
-  it('Doesnt use version of go that was only partially installed in cache', async () => {
-    const goDir: string = path.join(toolDir, 'go', '251.0.0', os.arch());
-    await io.mkdirP(goDir);
-    let thrown = false;
-    try {
-      // This will throw if it doesn't find it in the cache (because no such version exists)
-      await installer.getGo('251.0');
-    } catch {
-      thrown = true;
-    }
-    expect(thrown).toBe(true);
-    return;
-  });
-});

__tests__/setup-go.test.ts

@@ -0,0 +1,992 @@
+import * as core from '@actions/core';
+import * as io from '@actions/io';
+import * as tc from '@actions/tool-cache';
+import fs from 'fs';
+import cp from 'child_process';
+import osm, {type} from 'os';
+import path from 'path';
+import * as main from '../src/main';
+import * as im from '../src/installer';
+import * as httpm from '@actions/http-client';
+
+import goJsonData from './data/golang-dl.json';
+import matchers from '../matchers.json';
+import goTestManifest from './data/versions-manifest.json';
+const matcherPattern = matchers.problemMatcher[0].pattern[0];
+const matcherRegExp = new RegExp(matcherPattern.regexp);
+const win32Join = path.win32.join;
+const posixJoin = path.posix.join;
+
+jest.setTimeout(10000);
+
+describe('setup-go', () => {
+  let inputs = {} as any;
+  let os = {} as any;
+
+  let inSpy: jest.SpyInstance;
+  let getBooleanInputSpy: jest.SpyInstance;
+  let exportVarSpy: jest.SpyInstance;
+  let findSpy: jest.SpyInstance;
+  let cnSpy: jest.SpyInstance;
+  let logSpy: jest.SpyInstance;
+  let getSpy: jest.SpyInstance;
+  let platSpy: jest.SpyInstance;
+  let archSpy: jest.SpyInstance;
+  let joinSpy: jest.SpyInstance;
+  let dlSpy: jest.SpyInstance;
+  let extractTarSpy: jest.SpyInstance;
+  let extractZipSpy: jest.SpyInstance;
+  let cacheSpy: jest.SpyInstance;
+  let dbgSpy: jest.SpyInstance;
+  let whichSpy: jest.SpyInstance;
+  let existsSpy: jest.SpyInstance;
+  let readFileSpy: jest.SpyInstance;
+  let mkdirpSpy: jest.SpyInstance;
+  let mkdirSpy: jest.SpyInstance;
+  let symlinkSpy: jest.SpyInstance;
+  let execSpy: jest.SpyInstance;
+  let getManifestSpy: jest.SpyInstance;
+  let getAllVersionsSpy: jest.SpyInstance;
+  let httpmGetJsonSpy: jest.SpyInstance;
+
+  beforeAll(async () => {
+    process.env['GITHUB_ENV'] = ''; // Stub out Environment file functionality so we can verify it writes to standard out (toolkit is backwards compatible)
+  }, 100000);
+
+  beforeEach(() => {
+    process.env['GITHUB_PATH'] = ''; // Stub out ENV file functionality so we can verify it writes to standard out
+
+    // @actions/core
+    inputs = {};
+    inSpy = jest.spyOn(core, 'getInput');
+    inSpy.mockImplementation(name => inputs[name]);
+    getBooleanInputSpy = jest.spyOn(core, 'getBooleanInput');
+    getBooleanInputSpy.mockImplementation(name => inputs[name]);
+    exportVarSpy = jest.spyOn(core, 'exportVariable');
+
+    // node
+    os = {};
+    platSpy = jest.spyOn(osm, 'platform');
+    platSpy.mockImplementation(() => os['platform']);
+    archSpy = jest.spyOn(osm, 'arch');
+    archSpy.mockImplementation(() => os['arch']);
+    execSpy = jest.spyOn(cp, 'execSync');
+
+    // switch path join behaviour based on set os.platform
+    joinSpy = jest.spyOn(path, 'join');
+    joinSpy.mockImplementation((...paths: string[]): string => {
+      if (os['platform'] == 'win32') {
+        return win32Join(...paths);
+      }
+
+      return posixJoin(...paths);
+    });
+
+    // @actions/tool-cache
+    findSpy = jest.spyOn(tc, 'find');
+    dlSpy = jest.spyOn(tc, 'downloadTool');
+    extractTarSpy = jest.spyOn(tc, 'extractTar');
+    extractZipSpy = jest.spyOn(tc, 'extractZip');
+    cacheSpy = jest.spyOn(tc, 'cacheDir');
+    getSpy = jest.spyOn(im, 'getVersionsDist');
+    getManifestSpy = jest.spyOn(tc, 'getManifestFromRepo');
+    getAllVersionsSpy = jest.spyOn(im, 'getManifest');
+
+    // httm
+    httpmGetJsonSpy = jest.spyOn(httpm.HttpClient.prototype, 'getJson');
+
+    // io
+    whichSpy = jest.spyOn(io, 'which');
+    existsSpy = jest.spyOn(fs, 'existsSync');
+    readFileSpy = jest.spyOn(fs, 'readFileSync');
+    mkdirpSpy = jest.spyOn(io, 'mkdirP');
+
+    // fs
+    mkdirSpy = jest.spyOn(fs, 'mkdir');
+    symlinkSpy = jest.spyOn(fs, 'symlinkSync');
+    symlinkSpy.mockImplementation(() => {});
+
+    // gets
+    getManifestSpy.mockImplementation(() => <tc.IToolRelease[]>goTestManifest);
+
+    // writes
+    cnSpy = jest.spyOn(process.stdout, 'write');
+    logSpy = jest.spyOn(core, 'info');
+    dbgSpy = jest.spyOn(core, 'debug');
+    getSpy.mockImplementation(() => <im.IGoVersion[] | null>goJsonData);
+    cnSpy.mockImplementation(line => {
+      // uncomment to debug
+      // process.stderr.write('write:' + line + '\n');
+    });
+    logSpy.mockImplementation(line => {
+      // uncomment to debug
+      //process.stderr.write('log:' + line + '\n');
+    });
+    dbgSpy.mockImplementation(msg => {
+      // uncomment to see debug output
+      // process.stderr.write(msg + '\n');
+    });
+  });
+
+  afterEach(() => {
+    //jest.resetAllMocks();
+    jest.clearAllMocks();
+    //jest.restoreAllMocks();
+  });
+
+  afterAll(async () => {
+    jest.restoreAllMocks();
+  }, 100000);
+
+  it('can extract the major.minor.patch version from a given Go version string', async () => {
+    const goVersionOutput = 'go version go1.16.6 darwin/amd64';
+    expect(main.parseGoVersion(goVersionOutput)).toBe('1.16.6');
+  });
+
+  it('can find 1.9.7 from manifest on osx', async () => {
+    os.platform = 'darwin';
+    os.arch = 'x64';
+
+    const match = await im.getInfoFromManifest('1.9.7', true, 'mocktoken');
+    expect(match).toBeDefined();
+    expect(match!.resolvedVersion).toBe('1.9.7');
+    expect(match!.type).toBe('manifest');
+    expect(match!.downloadUrl).toBe(
+      'https://github.com/actions/go-versions/releases/download/1.9.7/go-1.9.7-darwin-x64.tar.gz'
+    );
+  });
+
+  it('should return manifest from repo', async () => {
+    const manifest = await im.getManifest(undefined);
+    expect(manifest).toEqual(goTestManifest);
+  });
+
+  it('should return manifest from raw URL if repo fetch fails', async () => {
+    getManifestSpy.mockRejectedValue(new Error('Fetch failed'));
+    httpmGetJsonSpy.mockResolvedValue({
+      result: goTestManifest
+    });
+    const manifest = await im.getManifest(undefined);
+    expect(httpmGetJsonSpy).toHaveBeenCalled();
+    expect(manifest).toEqual(goTestManifest);
+  });
+
+  it('can find 1.9 from manifest on linux', async () => {
+    os.platform = 'linux';
+    os.arch = 'x64';
+
+    const match = await im.getInfoFromManifest('1.9.7', true, 'mocktoken');
+    expect(match).toBeDefined();
+    expect(match!.resolvedVersion).toBe('1.9.7');
+    expect(match!.type).toBe('manifest');
+    expect(match!.downloadUrl).toBe(
+      'https://github.com/actions/go-versions/releases/download/1.9.7/go-1.9.7-linux-x64.tar.gz'
+    );
+  });
+
+  it('can find 1.9 from manifest on windows', async () => {
+    os.platform = 'win32';
+    os.arch = 'x64';
+
+    const match = await im.getInfoFromManifest('1.9.7', true, 'mocktoken');
+    expect(match).toBeDefined();
+    expect(match!.resolvedVersion).toBe('1.9.7');
+    expect(match!.type).toBe('manifest');
+    expect(match!.downloadUrl).toBe(
+      'https://github.com/actions/go-versions/releases/download/1.9.7/go-1.9.7-win32-x64.zip'
+    );
+  });
+
+  it('finds stable match for exact dot zero version', async () => {
+    os.platform = 'darwin';
+    os.arch = 'x64';
+
+    // spec: 1.13.0 => 1.13
+    const match: im.IGoVersion | undefined = await im.findMatch('1.13.0');
+    expect(match).toBeDefined();
+    const version: string = match ? match.version : '';
+    expect(version).toBe('go1.13');
+    const fileName = match ? match.files[0].filename : '';
+    expect(fileName).toBe('go1.13.darwin-amd64.tar.gz');
+  });
+
+  it('finds latest patch version for minor version spec', async () => {
+    os.platform = 'linux';
+    os.arch = 'x64';
+
+    // spec: 1.13 => 1.13.7 (latest)
+    const match: im.IGoVersion | undefined = await im.findMatch('1.13');
+    expect(match).toBeDefined();
+    const version: string = match ? match.version : '';
+    expect(version).toBe('go1.13.7');
+    const fileName = match ? match.files[0].filename : '';
+    expect(fileName).toBe('go1.13.7.linux-amd64.tar.gz');
+  });
+
+  it('finds latest patch version for caret version spec', async () => {
+    os.platform = 'linux';
+    os.arch = 'x64';
+
+    // spec: ^1.13.6 => 1.13.7
+    const match: im.IGoVersion | undefined = await im.findMatch('^1.13.6');
+    expect(match).toBeDefined();
+    const version: string = match ? match.version : '';
+    expect(version).toBe('go1.13.7');
+    const fileName = match ? match.files[0].filename : '';
+    expect(fileName).toBe('go1.13.7.linux-amd64.tar.gz');
+  });
+
+  it('finds latest version for major version spec', async () => {
+    os.platform = 'win32';
+    os.arch = 'x32';
+
+    // spec: 1 => 1.13.7 (latest)
+    const match: im.IGoVersion | undefined = await im.findMatch('1');
+    expect(match).toBeDefined();
+    const version: string = match ? match.version : '';
+    expect(version).toBe('go1.13.7');
+    const fileName = match ? match.files[0].filename : '';
+    expect(fileName).toBe('go1.13.7.windows-386.zip');
+  });
+
+  it('finds unstable pre-release version', async () => {
+    os.platform = 'linux';
+    os.arch = 'x64';
+
+    // spec: 1.14, stable=false => go1.14rc1
+    const match: im.IGoVersion | undefined = await im.findMatch('1.14.0-rc.1');
+    expect(match).toBeDefined();
+    const version: string = match ? match.version : '';
+    expect(version).toBe('go1.14rc1');
+    const fileName = match ? match.files[0].filename : '';
+    expect(fileName).toBe('go1.14rc1.linux-amd64.tar.gz');
+  });
+
+  it('evaluates to stable with input as true', async () => {
+    inputs['go-version'] = '1.13.0';
+    inputs.stable = 'true';
+
+    const toolPath = path.normalize('/cache/go/1.13.0/x64');
+    findSpy.mockImplementation(() => toolPath);
+    await main.run();
+
+    expect(logSpy).toHaveBeenCalledWith(`Setup go version spec 1.13.0`);
+  });
+
+  it('evaluates to stable with no input', async () => {
+    inputs['go-version'] = '1.13.0';
+
+    inSpy.mockImplementation(name => inputs[name]);
+
+    const toolPath = path.normalize('/cache/go/1.13.0/x64');
+    findSpy.mockImplementation(() => toolPath);
+    await main.run();
+
+    expect(logSpy).toHaveBeenCalledWith(`Setup go version spec 1.13.0`);
+  });
+
+  it('does not export any variables for Go versions >=1.9', async () => {
+    inputs['go-version'] = '1.13.0';
+    inSpy.mockImplementation(name => inputs[name]);
+
+    const toolPath = path.normalize('/cache/go/1.13.0/x64');
+    findSpy.mockImplementation(() => toolPath);
+
+    const vars: {[key: string]: string} = {};
+    exportVarSpy.mockImplementation((name: string, val: string) => {
+      vars[name] = val;
+    });
+
+    await main.run();
+    expect(vars).toStrictEqual({});
+  });
+
+  it('exports GOROOT for Go versions <1.9', async () => {
+    inputs['go-version'] = '1.8';
+    inSpy.mockImplementation(name => inputs[name]);
+
+    const toolPath = path.normalize('/cache/go/1.8.0/x64');
+    findSpy.mockImplementation(() => toolPath);
+
+    const vars: {[key: string]: string} = {};
+    exportVarSpy.mockImplementation((name: string, val: string) => {
+      vars[name] = val;
+    });
+
+    await main.run();
+    expect(vars).toStrictEqual({
+      GOROOT: toolPath
+    });
+  });
+
+  it('finds a version of go already in the cache', async () => {
+    inputs['go-version'] = '1.13.0';
+
+    const toolPath = path.normalize('/cache/go/1.13.0/x64');
+    findSpy.mockImplementation(() => toolPath);
+    await main.run();
+
+    expect(logSpy).toHaveBeenCalledWith(`Found in cache @ ${toolPath}`);
+  });
+
+  it('finds a version in the cache and adds it to the path', async () => {
+    inputs['go-version'] = '1.13.0';
+    const toolPath = path.normalize('/cache/go/1.13.0/x64');
+    findSpy.mockImplementation(() => toolPath);
+    await main.run();
+
+    const expPath = path.join(toolPath, 'bin');
+    expect(cnSpy).toHaveBeenCalledWith(`::add-path::${expPath}${osm.EOL}`);
+  });
+
+  it('handles unhandled error and reports error', async () => {
+    const errMsg = 'unhandled error message';
+    inputs['go-version'] = '1.13.0';
+
+    findSpy.mockImplementation(() => {
+      throw new Error(errMsg);
+    });
+    await main.run();
+    expect(cnSpy).toHaveBeenCalledWith('::error::' + errMsg + osm.EOL);
+  });
+
+  it('downloads a version not in the cache', async () => {
+    os.platform = 'linux';
+    os.arch = 'x64';
+
+    inputs['go-version'] = '1.13.1';
+
+    findSpy.mockImplementation(() => '');
+    dlSpy.mockImplementation(() => '/some/temp/path');
+    const toolPath = path.normalize('/cache/go/1.13.0/x64');
+    extractTarSpy.mockImplementation(() => '/some/other/temp/path');
+    cacheSpy.mockImplementation(() => toolPath);
+    await main.run();
+
+    const expPath = path.join(toolPath, 'bin');
+
+    expect(dlSpy).toHaveBeenCalled();
+    expect(extractTarSpy).toHaveBeenCalled();
+    expect(cnSpy).toHaveBeenCalledWith(`::add-path::${expPath}${osm.EOL}`);
+  });
+
+  it('downloads a version not in the cache (windows)', async () => {
+    os.platform = 'win32';
+    os.arch = 'x64';
+
+    inputs['go-version'] = '1.13.1';
+    process.env['RUNNER_TEMP'] = 'C:\\temp\\';
+
+    findSpy.mockImplementation(() => '');
+    dlSpy.mockImplementation(() => 'C:\\temp\\some\\path');
+    extractZipSpy.mockImplementation(() => 'C:\\temp\\some\\other\\path');
+
+    const toolPath = path.normalize('C:\\cache\\go\\1.13.0\\x64');
+    cacheSpy.mockImplementation(() => toolPath);
+
+    await main.run();
+
+    const expPath = path.win32.join(toolPath, 'bin');
+    expect(dlSpy).toHaveBeenCalledWith(
+      'https://storage.googleapis.com/golang/go1.13.1.windows-amd64.zip',
+      'C:\\temp\\go1.13.1.windows-amd64.zip',
+      undefined
+    );
+    expect(cnSpy).toHaveBeenCalledWith(`::add-path::${expPath}${osm.EOL}`);
+  });
+
+  it('does not find a version that does not exist', async () => {
+    os.platform = 'linux';
+    os.arch = 'x64';
+
+    inputs['go-version'] = '9.99.9';
+
+    findSpy.mockImplementation(() => '');
+    await main.run();
+
+    expect(cnSpy).toHaveBeenCalledWith(
+      `::error::Unable to find Go version '9.99.9' for platform linux and architecture x64.${osm.EOL}`
+    );
+  });
+
+  it('downloads a version from a manifest match', async () => {
+    os.platform = 'linux';
+    os.arch = 'x64';
+
+    const versionSpec = '1.12.16';
+
+    inputs['go-version'] = versionSpec;
+    inputs['token'] = 'faketoken';
+
+    const expectedUrl =
+      'https://github.com/actions/go-versions/releases/download/1.12.16-20200616.20/go-1.12.16-linux-x64.tar.gz';
+
+    // ... but not in the local cache
+    findSpy.mockImplementation(() => '');
+
+    dlSpy.mockImplementation(async () => '/some/temp/path');
+    const toolPath = path.normalize('/cache/go/1.12.16/x64');
+    extractTarSpy.mockImplementation(async () => '/some/other/temp/path');
+    cacheSpy.mockImplementation(async () => toolPath);
+
+    await main.run();
+
+    const expPath = path.join(toolPath, 'bin');
+
+    expect(dlSpy).toHaveBeenCalled();
+    expect(extractTarSpy).toHaveBeenCalled();
+    expect(logSpy).not.toHaveBeenCalledWith(
+      'Not found in manifest.  Falling back to download directly from Go'
+    );
+    expect(logSpy).toHaveBeenCalledWith(
+      `Acquiring 1.12.16 from ${expectedUrl}`
+    );
+
+    expect(logSpy).toHaveBeenCalledWith(`Added go to the path`);
+    expect(cnSpy).toHaveBeenCalledWith(`::add-path::${expPath}${osm.EOL}`);
+  });
+
+  it('downloads a major and minor from a manifest match', async () => {
+    os.platform = 'linux';
+    os.arch = 'x64';
+
+    const versionSpec = '1.12';
+
+    inputs['go-version'] = versionSpec;
+    inputs['token'] = 'faketoken';
+
+    const expectedUrl =
+      'https://github.com/actions/go-versions/releases/download/1.12.17-20200616.21/go-1.12.17-linux-x64.tar.gz';
+
+    // ... but not in the local cache
+    findSpy.mockImplementation(() => '');
+
+    dlSpy.mockImplementation(async () => '/some/temp/path');
+    const toolPath = path.normalize('/cache/go/1.12.17/x64');
+    extractTarSpy.mockImplementation(async () => '/some/other/temp/path');
+    cacheSpy.mockImplementation(async () => toolPath);
+
+    await main.run();
+
+    const expPath = path.join(toolPath, 'bin');
+
+    expect(dlSpy).toHaveBeenCalled();
+    expect(extractTarSpy).toHaveBeenCalled();
+    expect(logSpy).not.toHaveBeenCalledWith(
+      'Not found in manifest.  Falling back to download directly from Go'
+    );
+    expect(logSpy).toHaveBeenCalledWith(
+      `Acquiring 1.12.17 from ${expectedUrl}`
+    );
+
+    expect(logSpy).toHaveBeenCalledWith(`Added go to the path`);
+    expect(cnSpy).toHaveBeenCalledWith(`::add-path::${expPath}${osm.EOL}`);
+  });
+
+  it('falls back to a version from go dist', async () => {
+    os.platform = 'linux';
+    os.arch = 'x64';
+
+    const versionSpec = '1.12.14';
+
+    inputs['go-version'] = versionSpec;
+    inputs['token'] = 'faketoken';
+
+    // ... but not in the local cache
+    findSpy.mockImplementation(() => '');
+
+    dlSpy.mockImplementation(async () => '/some/temp/path');
+    const toolPath = path.normalize('/cache/go/1.12.14/x64');
+    extractTarSpy.mockImplementation(async () => '/some/other/temp/path');
+    cacheSpy.mockImplementation(async () => toolPath);
+
+    await main.run();
+
+    const expPath = path.join(toolPath, 'bin');
+    expect(logSpy).toHaveBeenCalledWith('Setup go version spec 1.12.14');
+    expect(findSpy).toHaveBeenCalled();
+    expect(logSpy).toHaveBeenCalledWith('Attempting to download 1.12.14...');
+    expect(dlSpy).toHaveBeenCalled();
+    expect(logSpy).toHaveBeenCalledWith('matching 1.12.14...');
+    expect(extractTarSpy).toHaveBeenCalled();
+    expect(logSpy).toHaveBeenCalledWith(
+      'Not found in manifest.  Falling back to download directly from Go'
+    );
+    expect(logSpy).toHaveBeenCalledWith(`Install from dist`);
+    expect(logSpy).toHaveBeenCalledWith(`Added go to the path`);
+    expect(cnSpy).toHaveBeenCalledWith(`::add-path::${expPath}${osm.EOL}`);
+  });
+
+  it('reports a failed download', async () => {
+    const errMsg = 'unhandled download message';
+    os.platform = 'linux';
+    os.arch = 'x64';
+
+    inputs['go-version'] = '1.13.1';
+
+    findSpy.mockImplementation(() => '');
+    dlSpy.mockImplementation(() => {
+      throw new Error(errMsg);
+    });
+    await main.run();
+
+    expect(cnSpy).toHaveBeenCalledWith(
+      `::error::Failed to download version 1.13.1: Error: ${errMsg}${osm.EOL}`
+    );
+  });
+
+  it('does not add BIN if go is not in path', async () => {
+    whichSpy.mockImplementation(async () => {
+      return '';
+    });
+    const added = await main.addBinToPath();
+    expect(added).toBeFalsy();
+  });
+
+  it('adds bin if dir not exists', async () => {
+    whichSpy.mockImplementation(async () => {
+      return '/usr/local/go/bin/go';
+    });
+
+    execSpy.mockImplementation(() => {
+      return '/Users/testuser/go';
+    });
+
+    mkdirpSpy.mockImplementation(async () => {});
+    existsSpy.mockImplementation(() => {
+      return false;
+    });
+
+    const added = await main.addBinToPath();
+    expect(added).toBeTruthy();
+  });
+
+  interface Annotation {
+    file: string;
+    line: number;
+    column: number;
+    message: string;
+  }
+
+  //
+  // problem matcher regex pattern tests
+
+  function testMatch(line: string): Annotation {
+    const annotation = <Annotation>{};
+
+    const match = matcherRegExp.exec(line);
+    if (match) {
+      annotation.line = parseInt(match[matcherPattern.line], 10);
+      annotation.column = parseInt(match[matcherPattern.column], 10);
+      annotation.file = match[matcherPattern.file].trim();
+      annotation.message = match[matcherPattern.message].trim();
+    }
+
+    return annotation;
+  }
+
+  it('matches on relative unix path', async () => {
+    const line = './main.go:13:2: undefined: fmt.Printl';
+    const annotation = testMatch(line);
+    expect(annotation).toBeDefined();
+    expect(annotation.line).toBe(13);
+    expect(annotation.column).toBe(2);
+    expect(annotation.file).toBe('./main.go');
+    expect(annotation.message).toBe('undefined: fmt.Printl');
+  });
+
+  it('matches on unix path up the tree', async () => {
+    const line = '../main.go:13:2: undefined: fmt.Printl';
+    const annotation = testMatch(line);
+    expect(annotation).toBeDefined();
+    expect(annotation.line).toBe(13);
+    expect(annotation.column).toBe(2);
+    expect(annotation.file).toBe('../main.go');
+    expect(annotation.message).toBe('undefined: fmt.Printl');
+  });
+
+  it('matches on unix path down the tree', async () => {
+    const line = 'foo/main.go:13:2: undefined: fmt.Printl';
+    const annotation = testMatch(line);
+    expect(annotation).toBeDefined();
+    expect(annotation.line).toBe(13);
+    expect(annotation.column).toBe(2);
+    expect(annotation.file).toBe('foo/main.go');
+    expect(annotation.message).toBe('undefined: fmt.Printl');
+  });
+
+  it('matches on rooted unix path', async () => {
+    const line = '/assert.go:4:1: missing return at end of function';
+    const annotation = testMatch(line);
+    expect(annotation).toBeDefined();
+    expect(annotation.line).toBe(4);
+    expect(annotation.column).toBe(1);
+    expect(annotation.file).toBe('/assert.go');
+    expect(annotation.message).toBe('missing return at end of function');
+  });
+
+  it('matches on unix path with spaces', async () => {
+    const line = '   ./assert.go:5:2: missing return at end of function   ';
+    const annotation = testMatch(line);
+    expect(annotation).toBeDefined();
+    expect(annotation.line).toBe(5);
+    expect(annotation.column).toBe(2);
+    expect(annotation.file).toBe('./assert.go');
+    expect(annotation.message).toBe('missing return at end of function');
+  });
+
+  it('matches on unix path with tabs', async () => {
+    const line = '\t./assert.go:5:2: missing return at end of function   ';
+    const annotation = testMatch(line);
+    expect(annotation).toBeDefined();
+    expect(annotation.line).toBe(5);
+    expect(annotation.column).toBe(2);
+    expect(annotation.file).toBe('./assert.go');
+    expect(annotation.message).toBe('missing return at end of function');
+  });
+
+  it('matches on relative windows path', async () => {
+    const line = '.\\main.go:13:2: undefined: fmt.Printl';
+    const annotation = testMatch(line);
+    expect(annotation).toBeDefined();
+    expect(annotation.line).toBe(13);
+    expect(annotation.column).toBe(2);
+    expect(annotation.file).toBe('.\\main.go');
+    expect(annotation.message).toBe('undefined: fmt.Printl');
+  });
+
+  it('matches on windows path up the tree', async () => {
+    const line = '..\\main.go:13:2: undefined: fmt.Printl';
+    const annotation = testMatch(line);
+    expect(annotation).toBeDefined();
+    expect(annotation.line).toBe(13);
+    expect(annotation.column).toBe(2);
+    expect(annotation.file).toBe('..\\main.go');
+    expect(annotation.message).toBe('undefined: fmt.Printl');
+  });
+
+  // 1.13.1 => 1.13.1
+  // 1.13 => 1.13.0
+  // 1.10beta1 => 1.10.0-beta.1, 1.10rc1 => 1.10.0-rc.1
+  // 1.8.5beta1 => 1.8.5-beta.1, 1.8.5rc1 => 1.8.5-rc.1
+  it('converts prerelease versions', async () => {
+    expect(im.makeSemver('1.10beta1')).toBe('1.10.0-beta.1');
+    expect(im.makeSemver('1.10rc1')).toBe('1.10.0-rc.1');
+  });
+
+  it('converts dot zero versions', async () => {
+    expect(im.makeSemver('1.13')).toBe('1.13.0');
+  });
+
+  it('does not convert exact versions', async () => {
+    expect(im.makeSemver('1.13.1')).toBe('1.13.1');
+  });
+
+  describe('check-latest flag', () => {
+    it("use local version and don't check manifest if check-latest is not specified", async () => {
+      os.platform = 'linux';
+      os.arch = 'x64';
+
+      inputs['go-version'] = '1.16';
+      inputs['check-latest'] = false;
+
+      const toolPath = path.normalize('/cache/go/1.16.1/x64');
+      findSpy.mockReturnValue(toolPath);
+      await main.run();
+
+      expect(logSpy).toHaveBeenCalledWith(`Found in cache @ ${toolPath}`);
+      expect(logSpy).not.toHaveBeenCalledWith(
+        'Attempting to resolve the latest version from the manifest...'
+      );
+    });
+
+    it('check latest version and resolve it from local cache', async () => {
+      os.platform = 'linux';
+      os.arch = 'x64';
+
+      inputs['go-version'] = '1.16';
+      inputs['check-latest'] = true;
+
+      const toolPath = path.normalize('/cache/go/1.16.1/x64');
+      findSpy.mockReturnValue(toolPath);
+      dlSpy.mockImplementation(async () => '/some/temp/path');
+      extractTarSpy.mockImplementation(async () => '/some/other/temp/path');
+      cacheSpy.mockImplementation(async () => toolPath);
+
+      await main.run();
+
+      expect(logSpy).toHaveBeenCalledWith('Setup go version spec 1.16');
+      expect(logSpy).toHaveBeenCalledWith(`Found in cache @ ${toolPath}`);
+    });
+
+    it('check latest version and install it from manifest', async () => {
+      os.platform = 'linux';
+      os.arch = 'x64';
+
+      const versionSpec = '1.17';
+      const patchVersion = '1.17.6';
+      inputs['go-version'] = versionSpec;
+      inputs['stable'] = 'true';
+      inputs['check-latest'] = true;
+
+      findSpy.mockImplementation(() => '');
+      dlSpy.mockImplementation(async () => '/some/temp/path');
+      const toolPath = path.normalize('/cache/go/1.17.6/x64');
+      extractTarSpy.mockImplementation(async () => '/some/other/temp/path');
+      cacheSpy.mockImplementation(async () => toolPath);
+
+      await main.run();
+
+      expect(logSpy).toHaveBeenCalledWith(
+        `Setup go version spec ${versionSpec}`
+      );
+      expect(logSpy).toHaveBeenCalledWith(
+        'Attempting to resolve the latest version from the manifest...'
+      );
+      expect(logSpy).toHaveBeenCalledWith(`Resolved as '${patchVersion}'`);
+      expect(logSpy).toHaveBeenCalledWith(
+        `Attempting to download ${patchVersion}...`
+      );
+      expect(logSpy).toHaveBeenCalledWith('Extracting Go...');
+      expect(logSpy).toHaveBeenCalledWith('Adding to the cache ...');
+      expect(logSpy).toHaveBeenCalledWith('Added go to the path');
+      expect(logSpy).toHaveBeenCalledWith(
+        `Successfully set up Go version ${versionSpec}`
+      );
+    });
+
+    it('fallback to dist if version is not found in manifest', async () => {
+      os.platform = 'linux';
+      os.arch = 'x64';
+
+      const versionSpec = '1.13';
+
+      inputs['go-version'] = versionSpec;
+      inputs['check-latest'] = true;
+      inputs['always-auth'] = false;
+      inputs['token'] = 'faketoken';
+
+      // ... but not in the local cache
+      findSpy.mockImplementation(() => '');
+
+      dlSpy.mockImplementation(async () => '/some/temp/path');
+      const toolPath = path.normalize('/cache/go/1.13.7/x64');
+      extractTarSpy.mockImplementation(async () => '/some/other/temp/path');
+      cacheSpy.mockImplementation(async () => toolPath);
+
+      await main.run();
+
+      const expPath = path.join(toolPath, 'bin');
+
+      expect(dlSpy).toHaveBeenCalled();
+      expect(extractTarSpy).toHaveBeenCalled();
+      expect(logSpy).toHaveBeenCalledWith(
+        'Attempting to resolve the latest version from the manifest...'
+      );
+      expect(logSpy).toHaveBeenCalledWith(
+        `Failed to resolve version ${versionSpec} from manifest`
+      );
+      expect(logSpy).toHaveBeenCalledWith(
+        `Attempting to download ${versionSpec}...`
+      );
+      expect(cnSpy).toHaveBeenCalledWith(`::add-path::${expPath}${osm.EOL}`);
+    });
+
+    it('fallback to dist if manifest is not available', async () => {
+      os.platform = 'linux';
+      os.arch = 'x64';
+
+      const versionSpec = '1.13';
+
+      process.env['GITHUB_PATH'] = '';
+
+      inputs['go-version'] = versionSpec;
+      inputs['check-latest'] = true;
+      inputs['always-auth'] = false;
+      inputs['token'] = 'faketoken';
+
+      // ... but not in the local cache
+      findSpy.mockImplementation(() => '');
+      getManifestSpy.mockImplementation(() => {
+        throw new Error('Unable to download manifest');
+      });
+      httpmGetJsonSpy.mockRejectedValue(
+        new Error('Unable to download manifest from raw URL')
+      );
+      getAllVersionsSpy.mockImplementationOnce(() => undefined);
+
+      dlSpy.mockImplementation(async () => '/some/temp/path');
+      const toolPath = path.normalize('/cache/go/1.13.7/x64');
+      extractTarSpy.mockImplementation(async () => '/some/other/temp/path');
+      cacheSpy.mockImplementation(async () => toolPath);
+
+      await main.run();
+
+      const expPath = path.join(toolPath, 'bin');
+
+      expect(logSpy).toHaveBeenCalledWith(
+        `Failed to resolve version ${versionSpec} from manifest`
+      );
+      expect(dlSpy).toHaveBeenCalled();
+      expect(extractTarSpy).toHaveBeenCalled();
+      expect(logSpy).toHaveBeenCalledWith(
+        'Attempting to resolve the latest version from the manifest...'
+      );
+      expect(logSpy).toHaveBeenCalledWith(
+        'Unable to resolve a version from the manifest...'
+      );
+      expect(logSpy).toHaveBeenCalledWith(
+        `Failed to resolve version ${versionSpec} from manifest`
+      );
+      expect(logSpy).toHaveBeenCalledWith(
+        `Attempting to download ${versionSpec}...`
+      );
+
+      expect(cnSpy).toHaveBeenCalledWith(`::add-path::${expPath}${osm.EOL}`);
+    });
+  });
+
+  describe('go-version-file', () => {
+    const goModContents = `module example.com/mymodule
+
+go 1.14
+
+require (
+	example.com/othermodule v1.2.3
+	example.com/thismodule v1.2.3
+	example.com/thatmodule v1.2.3
+)
+
+replace example.com/thatmodule => ../thatmodule
+exclude example.com/thismodule v1.3.0
+`;
+
+    const goWorkContents = `go 1.19
+
+use .
+
+`;
+
+    it('reads version from go.mod', async () => {
+      inputs['go-version-file'] = 'go.mod';
+      existsSpy.mockImplementation(() => true);
+      readFileSpy.mockImplementation(() => Buffer.from(goModContents));
+
+      await main.run();
+
+      expect(logSpy).toHaveBeenCalledWith('Setup go version spec 1.14');
+      expect(logSpy).toHaveBeenCalledWith('Attempting to download 1.14...');
+      expect(logSpy).toHaveBeenCalledWith('matching 1.14...');
+    });
+
+    it('reads version from go.work', async () => {
+      inputs['go-version-file'] = 'go.work';
+      existsSpy.mockImplementation(() => true);
+      readFileSpy.mockImplementation(() => Buffer.from(goWorkContents));
+
+      await main.run();
+
+      expect(logSpy).toHaveBeenCalledWith('Setup go version spec 1.19');
+      expect(logSpy).toHaveBeenCalledWith('Attempting to download 1.19...');
+      expect(logSpy).toHaveBeenCalledWith('matching 1.19...');
+    });
+
+    it('reads version from .go-version', async () => {
+      inputs['go-version-file'] = '.go-version';
+      existsSpy.mockImplementation(() => true);
+      readFileSpy.mockImplementation(() => Buffer.from(`1.13.0${osm.EOL}`));
+
+      await main.run();
+
+      expect(logSpy).toHaveBeenCalledWith('Setup go version spec 1.13.0');
+      expect(logSpy).toHaveBeenCalledWith('Attempting to download 1.13.0...');
+      expect(logSpy).toHaveBeenCalledWith('matching 1.13.0...');
+    });
+
+    it('is overwritten by go-version', async () => {
+      inputs['go-version'] = '1.13.1';
+      inputs['go-version-file'] = 'go.mod';
+      existsSpy.mockImplementation(() => true);
+      readFileSpy.mockImplementation(() => Buffer.from(goModContents));
+
+      await main.run();
+
+      expect(logSpy).toHaveBeenCalledWith('Setup go version spec 1.13.1');
+      expect(logSpy).toHaveBeenCalledWith('Attempting to download 1.13.1...');
+      expect(logSpy).toHaveBeenCalledWith('matching 1.13.1...');
+    });
+
+    it('reports a read failure', async () => {
+      inputs['go-version-file'] = 'go.mod';
+      existsSpy.mockImplementation(() => false);
+
+      await main.run();
+
+      expect(cnSpy).toHaveBeenCalledWith(
+        `::error::The specified go version file at: go.mod does not exist${osm.EOL}`
+      );
+    });
+
+    it('acquires specified architecture of go', async () => {
+      for (const {arch, version, osSpec} of [
+        {arch: 'amd64', version: '1.13.7', osSpec: 'linux'},
+        {arch: 'armv6l', version: '1.12.2', osSpec: 'linux'}
+      ]) {
+        os.platform = osSpec;
+        os.arch = arch;
+
+        const fileExtension = os.platform === 'win32' ? 'zip' : 'tar.gz';
+
+        const platform = os.platform === 'win32' ? 'win' : os.platform;
+
+        inputs['go-version'] = version;
+        inputs['architecture'] = arch;
+
+        const expectedUrl =
+          platform === 'win32'
+            ? `https://github.com/actions/go-versions/releases/download/${version}/go-${version}-${platform}-${arch}.${fileExtension}`
+            : `https://storage.googleapis.com/golang/go${version}.${osSpec}-${arch}.${fileExtension}`;
+
+        // ... but not in the local cache
+        findSpy.mockImplementation(() => '');
+
+        dlSpy.mockImplementation(async () => '/some/temp/path');
+        const toolPath = path.normalize(`/cache/go/${version}/${arch}`);
+        cacheSpy.mockImplementation(async () => toolPath);
+
+        await main.run();
+
+        expect(logSpy).toHaveBeenCalledWith(
+          `Acquiring go${version} from ${expectedUrl}`
+        );
+      }
+    }, 100000);
+
+    it.each(['stable', 'oldstable'])(
+      'acquires latest go version with %s go-version input',
+      async (alias: string) => {
+        const arch = 'x64';
+        os.platform = 'darwin';
+        os.arch = arch;
+
+        inputs['go-version'] = alias;
+        inputs['architecture'] = os.arch;
+
+        // ... but not in the local cache
+        findSpy.mockImplementation(() => '');
+
+        dlSpy.mockImplementation(async () => '/some/temp/path');
+        const toolPath = path.normalize(`/cache/go/${alias}/${arch}`);
+        cacheSpy.mockImplementation(async () => toolPath);
+
+        await main.run();
+
+        const releaseIndex = alias === 'stable' ? 0 : 1;
+
+        expect(logSpy).toHaveBeenCalledWith(
+          `${alias} version resolved as ${goTestManifest[releaseIndex].version}`
+        );
+      }
+    );
+  });
+});

__tests__/utils.test.ts

@@ -0,0 +1,52 @@
+import {isSelfHosted} from '../src/utils';
+
+describe('utils', () => {
+  describe('isSelfHosted', () => {
+    let AGENT_ISSELFHOSTED: string | undefined;
+    let RUNNER_ENVIRONMENT: string | undefined;
+
+    beforeEach(() => {
+      AGENT_ISSELFHOSTED = process.env['AGENT_ISSELFHOSTED'];
+      delete process.env['AGENT_ISSELFHOSTED'];
+      RUNNER_ENVIRONMENT = process.env['RUNNER_ENVIRONMENT'];
+      delete process.env['RUNNER_ENVIRONMENT'];
+    });
+
+    afterEach(() => {
+      if (AGENT_ISSELFHOSTED === undefined) {
+        delete process.env['AGENT_ISSELFHOSTED'];
+      } else {
+        process.env['AGENT_ISSELFHOSTED'] = AGENT_ISSELFHOSTED;
+      }
+      if (RUNNER_ENVIRONMENT === undefined) {
+        delete process.env['RUNNER_ENVIRONMENT'];
+      } else {
+        process.env['RUNNER_ENVIRONMENT'] = RUNNER_ENVIRONMENT;
+      }
+    });
+
+    it('isSelfHosted should be true if no environment variables set', () => {
+      expect(isSelfHosted()).toBeTruthy();
+    });
+
+    it('isSelfHosted should be true if environment variable is not set to denote GitHub hosted', () => {
+      process.env['RUNNER_ENVIRONMENT'] = 'some';
+      expect(isSelfHosted()).toBeTruthy();
+    });
+
+    it('isSelfHosted should be true if environment variable set to denote Azure Pipelines self hosted', () => {
+      process.env['AGENT_ISSELFHOSTED'] = '1';
+      expect(isSelfHosted()).toBeTruthy();
+    });
+
+    it('isSelfHosted should be false if environment variable set to denote GitHub hosted', () => {
+      process.env['RUNNER_ENVIRONMENT'] = 'github-hosted';
+      expect(isSelfHosted()).toBeFalsy();
+    });
+
+    it('isSelfHosted should be false if environment variable is not set to denote Azure Pipelines self hosted', () => {
+      process.env['AGENT_ISSELFHOSTED'] = 'some';
+      expect(isSelfHosted()).toBeFalsy();
+    });
+  });
+});

__tests__/verify-go.sh

@@ -0,0 +1,14 @@
+  
+#!/bin/sh
+
+if [ -z "$1" ]; then
+  echo "Must supply go version argument"
+  exit 1
+fi
+
+go_version="$(go version)"
+echo "Found go version '$go_version'"
+if [ -z "$(echo $go_version | grep $1)" ]; then
+  echo "Unexpected version"
+  exit 1
+fi

__tests__/windows-toolcache.test.ts

@@ -0,0 +1,62 @@
+import fs from 'fs';
+import * as io from '@actions/io';
+import * as tc from '@actions/tool-cache';
+import path from 'path';
+
+describe('Windows performance workaround', () => {
+  let mkdirSpy: jest.SpyInstance;
+  let symlinkSpy: jest.SpyInstance;
+  let statSpy: jest.SpyInstance;
+  let readdirSpy: jest.SpyInstance;
+  let writeFileSpy: jest.SpyInstance;
+  let rmRFSpy: jest.SpyInstance;
+  let mkdirPSpy: jest.SpyInstance;
+  let cpSpy: jest.SpyInstance;
+
+  let runnerToolCache: string | undefined;
+  beforeEach(() => {
+    mkdirSpy = jest.spyOn(fs, 'mkdir');
+    symlinkSpy = jest.spyOn(fs, 'symlinkSync');
+    statSpy = jest.spyOn(fs, 'statSync');
+    readdirSpy = jest.spyOn(fs, 'readdirSync');
+    writeFileSpy = jest.spyOn(fs, 'writeFileSync');
+    rmRFSpy = jest.spyOn(io, 'rmRF');
+    mkdirPSpy = jest.spyOn(io, 'mkdirP');
+    cpSpy = jest.spyOn(io, 'cp');
+
+    // default implementations
+    // @ts-ignore - not implement unused methods
+    statSpy.mockImplementation(() => ({
+      isDirectory: () => true
+    }));
+    readdirSpy.mockImplementation(() => []);
+    writeFileSpy.mockImplementation(() => {});
+    mkdirSpy.mockImplementation(() => {});
+    symlinkSpy.mockImplementation(() => {});
+    rmRFSpy.mockImplementation(() => Promise.resolve());
+    mkdirPSpy.mockImplementation(() => Promise.resolve());
+    cpSpy.mockImplementation(() => Promise.resolve());
+
+    runnerToolCache = process.env['RUNNER_TOOL_CACHE'];
+  });
+  afterEach(() => {
+    jest.clearAllMocks();
+    process.env['RUNNER_TOOL_CACHE'] = runnerToolCache;
+  });
+  // cacheWindowsToolkitDir depends on implementation of tc.cacheDir
+  // with the assumption that target dir is passed by RUNNER_TOOL_CACHE environment variable
+  // Make sure the implementation has not been changed
+  it('addExecutablesToCache should depend on env[RUNNER_TOOL_CACHE]', async () => {
+    process.env['RUNNER_TOOL_CACHE'] = '/faked-hostedtoolcache1';
+    const cacheDir1 = await tc.cacheDir('/qzx', 'go', '1.2.3', 'arch');
+    expect(cacheDir1).toBe(
+      path.join('/', 'faked-hostedtoolcache1', 'go', '1.2.3', 'arch')
+    );
+
+    process.env['RUNNER_TOOL_CACHE'] = '/faked-hostedtoolcache2';
+    const cacheDir2 = await tc.cacheDir('/qzx', 'go', '1.2.3', 'arch');
+    expect(cacheDir2).toBe(
+      path.join('/', 'faked-hostedtoolcache2', 'go', '1.2.3', 'arch')
+    );
+  });
+});

action.yml

@@ -1,14 +1,31 @@
 name: 'Setup Go environment'
-description: 'Setup a Go environment and add it to the PATH, additionally providing proxy support'
+description: 'Setup a Go environment and add it to the PATH'
 author: 'GitHub'
 inputs:
   go-version:
-    description: 'The Go version to download (if necessary) and use. Example: 1.9.3'
-    default: '1.10'
-# Deprecated option, do not use. Will not be supported after October 1, 2019
-  version:
-    description: 'Deprecated. Use go-version instead. Will not be supported after October 1, 2019'
-    deprecationMessage: 'The version property will not be supported after October 1, 2019. Use go-version instead'
+    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.'
+  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
+  token:
+    description: Used to pull Go distributions from go-versions. Since there's a default, this is typically not supplied by the user. When running this action on github.com, the default value is sufficient. When running on GHES, you can pass a personal access token for github.com if you are experiencing rate limiting.
+    default: ${{ github.server_url == 'https://github.com' && github.token || '' }}
+  cache:
+    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'
+  architecture:
+    description: 'Target architecture for Go to use. Examples: x86, x64. Will use system architecture by default.'
+outputs:
+  go-version:
+    description: 'The installed Go version. Useful when given a version range as input.'
+  cache-hit:
+    description: 'A boolean value to indicate if a cache was hit'
 runs:
-  using: 'node12'
-  main: 'lib/setup-go.js'
+  using: 'node20'
+  main: 'dist/setup/index.js'
+  post: 'dist/cache-save/index.js'
+  post-if: success()