Update CHANGELOG.md

* Update @actions/core to 1.10.0

* Backport state-helper updates

.eslintignore

@@ -0,0 +1,3 @@
+dist/
+lib/
+node_modules/

.eslintrc.json

@@ -0,0 +1,53 @@
+{
+  "plugins": ["jest", "@typescript-eslint"],
+  "extends": ["plugin:github/recommended"],
+  "parser": "@typescript-eslint/parser",
+  "parserOptions": {
+    "ecmaVersion": 9,
+    "sourceType": "module",
+    "project": "./tsconfig.json"
+  },
+  "rules": {
+    "eslint-comments/no-use": "off",
+    "import/no-namespace": "off",
+    "no-unused-vars": "off",
+    "@typescript-eslint/no-unused-vars": "error",
+    "@typescript-eslint/explicit-member-accessibility": ["error", {"accessibility": "no-public"}],
+    "@typescript-eslint/no-require-imports": "error",
+    "@typescript-eslint/array-type": "error",
+    "@typescript-eslint/await-thenable": "error",
+    "camelcase": "off",
+    "@typescript-eslint/explicit-function-return-type": ["error", {"allowExpressions": true}],
+    "@typescript-eslint/func-call-spacing": ["error", "never"],
+    "@typescript-eslint/no-array-constructor": "error",
+    "@typescript-eslint/no-empty-interface": "error",
+    "@typescript-eslint/no-explicit-any": "error",
+    "@typescript-eslint/no-extraneous-class": "error",
+    "@typescript-eslint/no-floating-promises": "error",
+    "@typescript-eslint/no-for-in-array": "error",
+    "@typescript-eslint/no-inferrable-types": "error",
+    "@typescript-eslint/no-misused-new": "error",
+    "@typescript-eslint/no-namespace": "error",
+    "@typescript-eslint/no-non-null-assertion": "warn",
+    "@typescript-eslint/no-unnecessary-qualifier": "error",
+    "@typescript-eslint/no-unnecessary-type-assertion": "error",
+    "@typescript-eslint/no-useless-constructor": "error",
+    "@typescript-eslint/no-var-requires": "error",
+    "@typescript-eslint/prefer-for-of": "warn",
+    "@typescript-eslint/prefer-function-type": "warn",
+    "@typescript-eslint/prefer-includes": "error",
+    "@typescript-eslint/prefer-string-starts-ends-with": "error",
+    "@typescript-eslint/promise-function-async": "error",
+    "@typescript-eslint/require-array-sort-compare": "error",
+    "@typescript-eslint/restrict-plus-operands": "error",
+    "semi": "off",
+    "@typescript-eslint/semi": ["error", "never"],
+    "@typescript-eslint/type-annotation-spacing": "error",
+    "@typescript-eslint/unbound-method": "error"
+  },
+  "env": {
+    "node": true,
+    "es6": true,
+    "jest/globals": true
+  }
+}

.gitattributes

@@ -0,0 +1 @@
+.licenses/** -diff linguist-generated=true

.github/workflows/check-dist.yml

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+# `dist/index.js` is a special file in Actions.
+# When you reference an action with `uses:` in a workflow,
+# `index.js` is the code that will run.
+# For our project, we generate this file through a build process
+# from other source files.
+# We need to make sure the checked-in `index.js` actually matches what we expect it to be.
+name: Check dist
+
+on:
+  push:
+    branches:
+      - main
+    paths-ignore:
+      - '**.md'
+  pull_request:
+    paths-ignore:
+      - '**.md'
+  workflow_dispatch:
+
+jobs:
+  check-dist:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v2
+
+      - name: Set Node.js 12.x
+        uses: actions/setup-node@v1
+        with:
+          node-version: 12.x
+
+      - name: Install dependencies
+        run: npm ci
+
+      - name: Rebuild the index.js file
+        run: npm run build
+
+      - name: Compare the expected and actual dist/ directories
+        run: |
+          if [ "$(git diff --ignore-space-at-eol dist/ | wc -l)" -gt "0" ]; then
+            echo "Detected uncommitted changes after build.  See status below:"
+            git diff
+            exit 1
+          fi
+
+      # If dist/ was different than expected, upload the expected version as an artifact
+      - uses: actions/upload-artifact@v2
+        if: ${{ failure() && steps.diff.conclusion == 'failure' }}
+        with:
+          name: dist
+          path: dist/

.github/workflows/codeql-analysis.yml

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+# For most projects, this workflow file will not need changing; you simply need
+# to commit it to your repository.
+#
+# You may wish to alter this file to override the set of languages analyzed,
+# or to provide custom queries or build logic.
+#
+# ******** NOTE ********
+# We have attempted to detect the languages in your repository. Please check
+# the `language` matrix defined below to confirm you have the correct set of
+# supported CodeQL languages.
+#
+name: "CodeQL"
+
+on:
+  push:
+    branches: [ main ]
+  pull_request:
+    # The branches below must be a subset of the branches above
+    branches: [ main ]
+  schedule:
+    - cron: '28 9 * * 0'
+
+jobs:
+  analyze:
+    name: Analyze
+    runs-on: ubuntu-latest
+    permissions:
+      actions: read
+      contents: read
+      security-events: write
+
+    strategy:
+      fail-fast: false
+      matrix:
+        language: [ 'javascript' ]
+        # CodeQL supports [ 'cpp', 'csharp', 'go', 'java', 'javascript', 'python' ]
+        # Learn more:
+        # https://docs.github.com/en/free-pro-team@latest/github/finding-security-vulnerabilities-and-errors-in-your-code/configuring-code-scanning#changing-the-languages-that-are-analyzed
+
+    steps:
+    - name: Checkout repository
+      uses: actions/checkout@v2
+
+    - name: Initialize CodeQL
+      uses: github/codeql-action/init@v1
+      with:
+        languages: ${{ matrix.language }}
+        # If you wish to specify custom queries, you can do so here or in a config file.
+        # By default, queries listed here will override any specified in a config file.
+        # Prefix the list here with "+" to use these queries and those in the config file.
+        # queries: ./path/to/local/query, your-org/your-repo/queries@main
+
+    - run: npm ci
+    - run: npm run build
+    - run: rm -rf dist # We want code scanning to analyze lib instead (individual .js files)
+
+    - name: Perform CodeQL Analysis
+      uses: github/codeql-action/analyze@v1

.github/workflows/licensed.yml

@@ -0,0 +1,14 @@
+name: Licensed
+
+on:
+  push: {branches: main}
+  pull_request: {branches: main}
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    name: Check licenses
+    steps:
+      - uses: actions/checkout@v2
+      - run: npm ci
+      - run: npm run licensed-check

.github/workflows/test.yml

@@ -1,18 +1,245 @@
-name: "test-local"
+name: Build and Test
+
 on:
   pull_request:
   push:
     branches:
-      - master
-      - 'releases/*'
+      - main
+      - releases/*
 
 jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/setup-node@v1
+        with:
+          node-version: 12.x
+      - uses: actions/checkout@v2
+      - run: npm ci
+      - run: npm run build
+      - run: npm run format-check
+      - run: npm run lint
+      - run: npm test
+      - name: Verify no unstaged changes
+        run: __test__/verify-no-unstaged-changes.sh
+
   test:
     strategy:
       matrix:
-        os: [windows-latest, ubuntu-latest, macOS-latest]
-    runs-on: ${{ matrix.os }}
+        runs-on: [ubuntu-latest, macos-latest, windows-latest]
+    runs-on: ${{ matrix.runs-on }}
+
     steps:
-    - uses: actions/checkout@master
-    - uses: ./
-    - run: git ls-remote --tags origin
+      # Clone this repo
+      - name: Checkout
+        uses: actions/checkout@v2
+
+      # Basic checkout
+      - name: Checkout basic
+        uses: ./
+        with:
+          ref: test-data/v2/basic
+          path: basic
+      - name: Verify basic
+        shell: bash
+        run: __test__/verify-basic.sh
+
+      # Clean
+      - name: Modify work tree
+        shell: bash
+        run: __test__/modify-work-tree.sh
+      - name: Checkout clean
+        uses: ./
+        with:
+          ref: test-data/v2/basic
+          path: basic
+      - name: Verify clean
+        shell: bash
+        run: __test__/verify-clean.sh
+
+      # Side by side
+      - name: Checkout side by side 1
+        uses: ./
+        with:
+          ref: test-data/v2/side-by-side-1
+          path: side-by-side-1
+      - name: Checkout side by side 2
+        uses: ./
+        with:
+          ref: test-data/v2/side-by-side-2
+          path: side-by-side-2
+      - name: Verify side by side
+        shell: bash
+        run: __test__/verify-side-by-side.sh
+
+      # LFS
+      - name: Checkout LFS
+        uses: ./
+        with:
+          repository: actions/checkout # hardcoded, otherwise doesn't work from a fork
+          ref: test-data/v2/lfs
+          path: lfs
+          lfs: true
+      - name: Verify LFS
+        shell: bash
+        run: __test__/verify-lfs.sh
+
+      # Submodules false
+      - name: Checkout submodules false
+        uses: ./
+        with:
+          ref: test-data/v2/submodule-ssh-url
+          path: submodules-false
+      - name: Verify submodules false
+        run: __test__/verify-submodules-false.sh
+
+      # Submodules one level
+      - name: Checkout submodules true
+        uses: ./
+        with:
+          ref: test-data/v2/submodule-ssh-url
+          path: submodules-true
+          submodules: true
+      - name: Verify submodules true
+        run: __test__/verify-submodules-true.sh
+
+      # Submodules recursive
+      - name: Checkout submodules recursive
+        uses: ./
+        with:
+          ref: test-data/v2/submodule-ssh-url
+          path: submodules-recursive
+          submodules: recursive
+      - name: Verify submodules recursive
+        run: __test__/verify-submodules-recursive.sh
+
+      # Basic checkout using REST API
+      - name: Remove basic
+        if: runner.os != 'windows'
+        run: rm -rf basic
+      - name: Remove basic (Windows)
+        if: runner.os == 'windows'
+        shell: cmd
+        run: rmdir /s /q basic
+      - name: Override git version
+        if: runner.os != 'windows'
+        run: __test__/override-git-version.sh
+      - name: Override git version (Windows)
+        if: runner.os == 'windows'
+        run: __test__\\override-git-version.cmd
+      - name: Checkout basic using REST API
+        uses: ./
+        with:
+          ref: test-data/v2/basic
+          path: basic
+      - name: Verify basic
+        run: __test__/verify-basic.sh --archive
+
+  test-proxy:
+    runs-on: ubuntu-latest
+    container:
+      image: alpine/git:latest
+      options: --dns 127.0.0.1
+    services:
+      squid-proxy:
+        image: datadog/squid:latest
+        ports:
+          - 3128:3128
+    env:
+      https_proxy: http://squid-proxy:3128
+    steps:
+      # Clone this repo
+      - name: Checkout
+        uses: actions/checkout@v2
+
+      # Basic checkout using git
+      - name: Checkout basic
+        uses: ./
+        with:
+          ref: test-data/v2/basic
+          path: basic
+      - name: Verify basic
+        run: __test__/verify-basic.sh
+
+      # Basic checkout using REST API
+      - name: Remove basic
+        run: rm -rf basic
+      - name: Override git version
+        run: __test__/override-git-version.sh
+      - name: Basic checkout using REST API
+        uses: ./
+        with:
+          ref: test-data/v2/basic
+          path: basic
+      - name: Verify basic
+        run: __test__/verify-basic.sh --archive
+
+  test-bypass-proxy:
+    runs-on: ubuntu-latest
+    env:
+      https_proxy: http://no-such-proxy:3128
+      no_proxy: api.github.com,github.com
+    steps:
+      # Clone this repo
+      - name: Checkout
+        uses: actions/checkout@v2
+
+      # Basic checkout using git
+      - name: Checkout basic
+        uses: ./
+        with:
+          ref: test-data/v2/basic
+          path: basic
+      - name: Verify basic
+        run: __test__/verify-basic.sh
+      - name: Remove basic
+        run: rm -rf basic
+
+      # Basic checkout using REST API
+      - name: Override git version
+        run: __test__/override-git-version.sh
+      - name: Checkout basic using REST API
+        uses: ./
+        with:
+          ref: test-data/v2/basic
+          path: basic
+      - name: Verify basic
+        run: __test__/verify-basic.sh --archive
+    
+  test-git-container:
+    runs-on: ubuntu-latest
+    container: bitnami/git:latest
+    steps:
+      # Clone this repo
+      - name: Checkout
+        uses: actions/checkout@v3
+        with:
+          path: v3
+
+      # Basic checkout using git
+      - name: Checkout basic
+        uses: ./v3
+        with:
+          ref: test-data/v2/basic
+      - name: Verify basic
+        run: |
+          if [ ! -f "./basic-file.txt" ]; then
+              echo "Expected basic file does not exist"
+              exit 1
+          fi
+
+          # Verify .git folder
+          if [ ! -d "./.git" ]; then
+            echo "Expected ./.git folder to exist"
+            exit 1
+          fi
+
+          # Verify auth token
+          git config --global --add safe.directory "*"
+          git fetch --no-tags --depth=1 origin +refs/heads/main:refs/remotes/origin/main
+
+      # needed to make checkout post cleanup succeed
+      - name: Fix Checkout v3
+        uses: actions/checkout@v3
+        with:
+          path: v3

.gitignore

@@ -0,0 +1,4 @@
+__test__/_temp
+_temp/
+lib/
+node_modules/

.licensed.yml

@@ -0,0 +1,14 @@
+sources:
+  npm: true
+
+allowed:
+  - apache-2.0
+  - bsd-2-clause
+  - bsd-3-clause
+  - isc
+  - mit
+  - cc0-1.0
+  - unlicense
+
+reviewed:
+  npm:

.prettierignore

@@ -0,0 +1,3 @@
+dist/
+lib/
+node_modules/

.prettierrc.json

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

CHANGELOG.md

@@ -0,0 +1,67 @@
+# Changelog
+
+## v2.5.0
+- [Bump @actions/core to v1.10.0](https://github.com/actions/checkout/pull/962)
+
+## v2.4.2
+- [Add input `set-safe-directory`](https://github.com/actions/checkout/pull/776)
+
+## v2.4.1
+- [Set the safe directory option on git to prevent git commands failing when running in containers](https://github.com/actions/checkout/pull/762)
+
+## v2.3.1
+
+- [Fix default branch resolution for .wiki and when using SSH](https://github.com/actions/checkout/pull/284)
+
+
+## v2.3.0
+
+- [Fallback to the default branch](https://github.com/actions/checkout/pull/278)
+
+## v2.2.0
+
+- [Fetch all history for all tags and branches when fetch-depth=0](https://github.com/actions/checkout/pull/258)
+
+## v2.1.1
+
+- Changes to support GHES ([here](https://github.com/actions/checkout/pull/236) and [here](https://github.com/actions/checkout/pull/248))
+
+## v2.1.0
+
+- [Group output](https://github.com/actions/checkout/pull/191)
+- [Changes to support GHES alpha release](https://github.com/actions/checkout/pull/199)
+- [Persist core.sshCommand for submodules](https://github.com/actions/checkout/pull/184)
+- [Add support ssh](https://github.com/actions/checkout/pull/163)
+- [Convert submodule SSH URL to HTTPS, when not using SSH](https://github.com/actions/checkout/pull/179)
+- [Add submodule support](https://github.com/actions/checkout/pull/157)
+- [Follow proxy settings](https://github.com/actions/checkout/pull/144)
+- [Fix ref for pr closed event when a pr is merged](https://github.com/actions/checkout/pull/141)
+- [Fix issue checking detached when git less than 2.22](https://github.com/actions/checkout/pull/128)
+
+## v2.0.0
+
+- [Do not pass cred on command line](https://github.com/actions/checkout/pull/108)
+- [Add input persist-credentials](https://github.com/actions/checkout/pull/107)
+- [Fallback to REST API to download repo](https://github.com/actions/checkout/pull/104)
+
+## v2 (beta)
+
+- Improved fetch performance
+  - The default behavior now fetches only the SHA being checked-out
+- Script authenticated git commands
+  - Persists `with.token` in the local git config
+  - Enables your scripts to run authenticated git commands
+  - Post-job cleanup removes the token
+  - Coming soon: Opt out by setting `with.persist-credentials` to `false`
+- Creates a local branch
+  - No longer detached HEAD when checking out a branch
+  - A local branch is created with the corresponding upstream branch set
+- Improved layout
+  - `with.path` is always relative to `github.workspace`
+  - Aligns better with container actions, where `github.workspace` gets mapped in
+- Removed input `submodules`
+
+
+## v1
+
+Refer [here](https://github.com/actions/checkout/blob/v1/CHANGELOG.md) for the V1 changelog

CODEOWNERS

@@ -0,0 +1 @@
+* @actions/actions-runtime

README.md

@@ -2,63 +2,240 @@
   <a href="https://github.com/actions/checkout"><img alt="GitHub Actions status" src="https://github.com/actions/checkout/workflows/test-local/badge.svg"></a>
 </p>
 
-# Checkout
+# Checkout V2
 
-This action checks out your repository to `$GITHUB_WORKSPACE`, so that your workflow can access the contents of your repository.
+This action checks-out your repository under `$GITHUB_WORKSPACE`, so your workflow can access it.
 
-By default, this is equivalent to running `git fetch` and `git checkout $GITHUB_SHA`, so that you'll always have your repo contents at the version that triggered the workflow.
-See [here](https://help.github.com/en/articles/events-that-trigger-workflows) to learn what `$GITHUB_SHA` is for different kinds of events.
+Only a single commit is fetched by default, for the ref/SHA that triggered the workflow. Set `fetch-depth: 0` to fetch all history for all branches and tags. Refer [here](https://help.github.com/en/articles/events-that-trigger-workflows) to learn which commit `$GITHUB_SHA` points to for different events.
+
+The auth token is persisted in the local git config. This enables your scripts to run authenticated git commands. The token is removed during post-job cleanup. Set `persist-credentials: false` to opt-out.
+
+When Git 2.18 or higher is not in your PATH, falls back to the REST API to download the files.
+
+# What's new
+
+- Improved performance
+  - Fetches only a single commit by default
+- Script authenticated git commands
+  - Auth token persisted in the local git config
+- Supports SSH
+- Creates a local branch
+  - No longer detached HEAD when checking out a branch
+- Improved layout
+  - The input `path` is always relative to $GITHUB_WORKSPACE
+  - Aligns better with container actions, where $GITHUB_WORKSPACE gets mapped in
+- Fallback to REST API download
+  - When Git 2.18 or higher is not in the PATH, the REST API will be used to download the files
+  - When using a job container, the container's PATH is used
+
+Refer [here](https://github.com/actions/checkout/blob/v1/README.md) for previous versions.
 
 # Usage
 
-See [action.yml](action.yml)
+<!-- start usage -->
+```yaml
+- uses: actions/checkout@v2
+  with:
+    # Repository name with owner. For example, actions/checkout
+    # Default: ${{ github.repository }}
+    repository: ''
 
-Basic:
+    # The branch, tag or SHA to checkout. When checking out the repository that
+    # triggered a workflow, this defaults to the reference or SHA for that event.
+    # Otherwise, uses the default branch.
+    ref: ''
+
+    # Personal access token (PAT) used to fetch the repository. The PAT is configured
+    # with the local git config, which enables your scripts to run authenticated git
+    # commands. The post-job step removes the PAT.
+    #
+    # We recommend using a service account with the least permissions necessary. Also
+    # when generating a new PAT, select the least scopes necessary.
+    #
+    # [Learn more about creating and using encrypted secrets](https://help.github.com/en/actions/automating-your-workflow-with-github-actions/creating-and-using-encrypted-secrets)
+    #
+    # Default: ${{ github.token }}
+    token: ''
+
+    # SSH key used to fetch the repository. The SSH key is configured with the local
+    # git config, which enables your scripts to run authenticated git commands. The
+    # post-job step removes the SSH key.
+    #
+    # We recommend using a service account with the least permissions necessary.
+    #
+    # [Learn more about creating and using encrypted secrets](https://help.github.com/en/actions/automating-your-workflow-with-github-actions/creating-and-using-encrypted-secrets)
+    ssh-key: ''
+
+    # Known hosts in addition to the user and global host key database. The public SSH
+    # keys for a host may be obtained using the utility `ssh-keyscan`. For example,
+    # `ssh-keyscan github.com`. The public key for github.com is always implicitly
+    # added.
+    ssh-known-hosts: ''
+
+    # Whether to perform strict host key checking. When true, adds the options
+    # `StrictHostKeyChecking=yes` and `CheckHostIP=no` to the SSH command line. Use
+    # the input `ssh-known-hosts` to configure additional hosts.
+    # Default: true
+    ssh-strict: ''
+
+    # Whether to configure the token or SSH key with the local git config
+    # Default: true
+    persist-credentials: ''
+
+    # Relative path under $GITHUB_WORKSPACE to place the repository
+    path: ''
+
+    # Whether to execute `git clean -ffdx && git reset --hard HEAD` before fetching
+    # Default: true
+    clean: ''
+
+    # Number of commits to fetch. 0 indicates all history for all branches and tags.
+    # Default: 1
+    fetch-depth: ''
+
+    # Whether to download Git-LFS files
+    # Default: false
+    lfs: ''
+
+    # Whether to checkout submodules: `true` to checkout submodules or `recursive` to
+    # recursively checkout submodules.
+    #
+    # When the `ssh-key` input is not provided, SSH URLs beginning with
+    # `git@github.com:` are converted to HTTPS.
+    #
+    # Default: false
+    submodules: ''
+
+    # Add repository path as safe.directory for Git global config by running `git
+    # config --global --add safe.directory <path>`
+    # Default: true
+    set-safe-directory: ''
+```
+<!-- end usage -->
+
+# Scenarios
+
+- [Fetch all history for all tags and branches](#Fetch-all-history-for-all-tags-and-branches)
+- [Checkout a different branch](#Checkout-a-different-branch)
+- [Checkout HEAD^](#Checkout-HEAD)
+- [Checkout multiple repos (side by side)](#Checkout-multiple-repos-side-by-side)
+- [Checkout multiple repos (nested)](#Checkout-multiple-repos-nested)
+- [Checkout multiple repos (private)](#Checkout-multiple-repos-private)
+- [Checkout pull request HEAD commit instead of merge commit](#Checkout-pull-request-HEAD-commit-instead-of-merge-commit)
+- [Checkout pull request on closed event](#Checkout-pull-request-on-closed-event)
+- [Push a commit using the built-in token](#Push-a-commit-using-the-built-in-token)
+
+## Fetch all history for all tags and branches
 
 ```yaml
-steps:
-- uses: actions/checkout@v1
-- uses: actions/setup-node@v1
+- uses: actions/checkout@v2
   with:
-    node-version: 10.x 
-- run: npm install
-- run: npm test
+    fetch-depth: 0
 ```
 
-By default, the branch or tag ref that triggered the workflow will be checked out, `${{ github.token }}` will be used for any Git server authentication. If you wish to check out a different branch, a different repository or use different token to checkout, specify that using `with.ref`, `with.repository` and `with.token`:
+## Checkout a different branch
 
-Checkout different branch from the workflow repository:
 ```yaml
-- uses: actions/checkout@v1
+- uses: actions/checkout@v2
   with:
-    ref: some-branch
+    ref: my-branch
 ```
 
-Checkout different private repository:
+## Checkout HEAD^
+
 ```yaml
-- uses: actions/checkout@v1
+- uses: actions/checkout@v2
   with:
-    repository: myAccount/myRepository
-    ref: refs/heads/release
-    token: ${{ secrets.GitHub_PAT }} // `GitHub_PAT` is a secret contains your PAT.
+    fetch-depth: 2
+- run: git checkout HEAD^
 ```
 
-Checkout private submodules:
+## Checkout multiple repos (side by side)
+
 ```yaml
-- uses: actions/checkout@v1
+- name: Checkout
+  uses: actions/checkout@v2
   with:
-    submodules: recursive
-    token: ${{ secrets.GitHub_PAT }} // `GitHub_PAT` is a secret contains your PAT.
+    path: main
+
+- name: Checkout tools repo
+  uses: actions/checkout@v2
+  with:
+    repository: my-org/my-tools
+    path: my-tools
 ```
-> - `with.token` will be used as `Basic` authentication header for https requests talk to https://github.com from `git(.exe)`, ensure those private submodules are configured via `https` not `ssh`.
-> - `${{ github.token }}` only has permission to the workflow triggering repository. If the repository contains any submodules that comes from private repository, you will have to add your PAT as secret and use the secret in `with.token` to make `checkout` action work.
 
-For more details, see [Contexts and expression syntax for GitHub Actions](https://help.github.com/en/articles/contexts-and-expression-syntax-for-github-actions) and [Creating and using secrets (encrypted variables)](https://help.github.com/en/articles/virtual-environments-for-github-actions#creating-and-using-secrets-encrypted-variables)
+## Checkout multiple repos (nested)
 
-# Changelog
+```yaml
+- name: Checkout
+  uses: actions/checkout@v2
 
-## v1.1.0 (unreleased)
-- Persist `with.token` or `${{ github.token }}` into checkout repository's git config as `http.https://github.com/.extraheader=AUTHORIZATION: basic ***` to better support scripting git
+- name: Checkout tools repo
+  uses: actions/checkout@v2
+  with:
+    repository: my-org/my-tools
+    path: my-tools
+```
+
+## Checkout multiple repos (private)
+
+```yaml
+- name: Checkout
+  uses: actions/checkout@v2
+  with:
+    path: main
+
+- name: Checkout private tools
+  uses: actions/checkout@v2
+  with:
+    repository: my-org/my-private-tools
+    token: ${{ secrets.GH_PAT }} # `GH_PAT` is a secret that contains your PAT
+    path: my-tools
+```
+
+> - `${{ github.token }}` is scoped to the current repository, so if you want to checkout a different repository that is private you will need to provide your own [PAT](https://help.github.com/en/github/authenticating-to-github/creating-a-personal-access-token-for-the-command-line).
+
+
+## Checkout pull request HEAD commit instead of merge commit
+
+```yaml
+- uses: actions/checkout@v2
+  with:
+    ref: ${{ github.event.pull_request.head.sha }}
+```
+
+## Checkout pull request on closed event
+
+```yaml
+on:
+  pull_request:
+    branches: [main]
+    types: [opened, synchronize, closed]
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+```
+
+## Push a commit using the built-in token
+
+```yaml
+on: push
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - run: |
+          date > generated.txt
+          git config user.name github-actions
+          git config user.email github-actions@github.com
+          git add .
+          git commit -m "generated"
+          git push
+```
 
 # License
 

__test__/git-auth-helper.test.ts

@@ -0,0 +1,810 @@
+import * as core from '@actions/core'
+import * as fs from 'fs'
+import * as gitAuthHelper from '../lib/git-auth-helper'
+import * as io from '@actions/io'
+import * as os from 'os'
+import * as path from 'path'
+import * as stateHelper from '../lib/state-helper'
+import {IGitCommandManager} from '../lib/git-command-manager'
+import {IGitSourceSettings} from '../lib/git-source-settings'
+
+const isWindows = process.platform === 'win32'
+const testWorkspace = path.join(__dirname, '_temp', 'git-auth-helper')
+const originalRunnerTemp = process.env['RUNNER_TEMP']
+const originalHome = process.env['HOME']
+let workspace: string
+let localGitConfigPath: string
+let globalGitConfigPath: string
+let runnerTemp: string
+let tempHomedir: string
+let git: IGitCommandManager & {env: {[key: string]: string}}
+let settings: IGitSourceSettings
+let sshPath: string
+
+describe('git-auth-helper tests', () => {
+  beforeAll(async () => {
+    // SSH
+    sshPath = await io.which('ssh')
+
+    // Clear test workspace
+    await io.rmRF(testWorkspace)
+  })
+
+  beforeEach(() => {
+    // Mock setSecret
+    jest.spyOn(core, 'setSecret').mockImplementation((secret: string) => {})
+
+    // Mock error/warning/info/debug
+    jest.spyOn(core, 'error').mockImplementation(jest.fn())
+    jest.spyOn(core, 'warning').mockImplementation(jest.fn())
+    jest.spyOn(core, 'info').mockImplementation(jest.fn())
+    jest.spyOn(core, 'debug').mockImplementation(jest.fn())
+
+    // Mock state helper
+    jest.spyOn(stateHelper, 'setSshKeyPath').mockImplementation(jest.fn())
+    jest
+      .spyOn(stateHelper, 'setSshKnownHostsPath')
+      .mockImplementation(jest.fn())
+  })
+
+  afterEach(() => {
+    // Unregister mocks
+    jest.restoreAllMocks()
+
+    // Restore HOME
+    if (originalHome) {
+      process.env['HOME'] = originalHome
+    } else {
+      delete process.env['HOME']
+    }
+  })
+
+  afterAll(() => {
+    // Restore RUNNER_TEMP
+    delete process.env['RUNNER_TEMP']
+    if (originalRunnerTemp) {
+      process.env['RUNNER_TEMP'] = originalRunnerTemp
+    }
+  })
+
+  const configureAuth_configuresAuthHeader =
+    'configureAuth configures auth header'
+  it(configureAuth_configuresAuthHeader, async () => {
+    // Arrange
+    await setup(configureAuth_configuresAuthHeader)
+    expect(settings.authToken).toBeTruthy() // sanity check
+    const authHelper = gitAuthHelper.createAuthHelper(git, settings)
+
+    // Act
+    await authHelper.configureAuth()
+
+    // Assert config
+    const configContent = (
+      await fs.promises.readFile(localGitConfigPath)
+    ).toString()
+    const basicCredential = Buffer.from(
+      `x-access-token:${settings.authToken}`,
+      'utf8'
+    ).toString('base64')
+    expect(
+      configContent.indexOf(
+        `http.https://github.com/.extraheader AUTHORIZATION: basic ${basicCredential}`
+      )
+    ).toBeGreaterThanOrEqual(0)
+  })
+
+  const configureAuth_configuresAuthHeaderEvenWhenPersistCredentialsFalse =
+    'configureAuth configures auth header even when persist credentials false'
+  it(
+    configureAuth_configuresAuthHeaderEvenWhenPersistCredentialsFalse,
+    async () => {
+      // Arrange
+      await setup(
+        configureAuth_configuresAuthHeaderEvenWhenPersistCredentialsFalse
+      )
+      expect(settings.authToken).toBeTruthy() // sanity check
+      settings.persistCredentials = false
+      const authHelper = gitAuthHelper.createAuthHelper(git, settings)
+
+      // Act
+      await authHelper.configureAuth()
+
+      // Assert config
+      const configContent = (
+        await fs.promises.readFile(localGitConfigPath)
+      ).toString()
+      expect(
+        configContent.indexOf(
+          `http.https://github.com/.extraheader AUTHORIZATION`
+        )
+      ).toBeGreaterThanOrEqual(0)
+    }
+  )
+
+  const configureAuth_copiesUserKnownHosts =
+    'configureAuth copies user known hosts'
+  it(configureAuth_copiesUserKnownHosts, async () => {
+    if (!sshPath) {
+      process.stdout.write(
+        `Skipped test "${configureAuth_copiesUserKnownHosts}". Executable 'ssh' not found in the PATH.\n`
+      )
+      return
+    }
+
+    // Arange
+    await setup(configureAuth_copiesUserKnownHosts)
+    expect(settings.sshKey).toBeTruthy() // sanity check
+
+    // Mock fs.promises.readFile
+    const realReadFile = fs.promises.readFile
+    jest.spyOn(fs.promises, 'readFile').mockImplementation(
+      async (file: any, options: any): Promise<Buffer> => {
+        const userKnownHostsPath = path.join(
+          os.homedir(),
+          '.ssh',
+          'known_hosts'
+        )
+        if (file === userKnownHostsPath) {
+          return Buffer.from('some-domain.com ssh-rsa ABCDEF')
+        }
+
+        return await realReadFile(file, options)
+      }
+    )
+
+    // Act
+    const authHelper = gitAuthHelper.createAuthHelper(git, settings)
+    await authHelper.configureAuth()
+
+    // Assert known hosts
+    const actualSshKnownHostsPath = await getActualSshKnownHostsPath()
+    const actualSshKnownHostsContent = (
+      await fs.promises.readFile(actualSshKnownHostsPath)
+    ).toString()
+    expect(actualSshKnownHostsContent).toMatch(
+      /some-domain\.com ssh-rsa ABCDEF/
+    )
+    expect(actualSshKnownHostsContent).toMatch(/github\.com ssh-rsa AAAAB3N/)
+  })
+
+  const configureAuth_registersBasicCredentialAsSecret =
+    'configureAuth registers basic credential as secret'
+  it(configureAuth_registersBasicCredentialAsSecret, async () => {
+    // Arrange
+    await setup(configureAuth_registersBasicCredentialAsSecret)
+    expect(settings.authToken).toBeTruthy() // sanity check
+    const authHelper = gitAuthHelper.createAuthHelper(git, settings)
+
+    // Act
+    await authHelper.configureAuth()
+
+    // Assert secret
+    const setSecretSpy = core.setSecret as jest.Mock<any, any>
+    expect(setSecretSpy).toHaveBeenCalledTimes(1)
+    const expectedSecret = Buffer.from(
+      `x-access-token:${settings.authToken}`,
+      'utf8'
+    ).toString('base64')
+    expect(setSecretSpy).toHaveBeenCalledWith(expectedSecret)
+  })
+
+  const setsSshCommandEnvVarWhenPersistCredentialsFalse =
+    'sets SSH command env var when persist-credentials false'
+  it(setsSshCommandEnvVarWhenPersistCredentialsFalse, async () => {
+    if (!sshPath) {
+      process.stdout.write(
+        `Skipped test "${setsSshCommandEnvVarWhenPersistCredentialsFalse}". Executable 'ssh' not found in the PATH.\n`
+      )
+      return
+    }
+
+    // Arrange
+    await setup(setsSshCommandEnvVarWhenPersistCredentialsFalse)
+    settings.persistCredentials = false
+    const authHelper = gitAuthHelper.createAuthHelper(git, settings)
+
+    // Act
+    await authHelper.configureAuth()
+
+    // Assert git env var
+    const actualKeyPath = await getActualSshKeyPath()
+    const actualKnownHostsPath = await getActualSshKnownHostsPath()
+    const expectedSshCommand = `"${sshPath}" -i "$RUNNER_TEMP/${path.basename(
+      actualKeyPath
+    )}" -o StrictHostKeyChecking=yes -o CheckHostIP=no -o "UserKnownHostsFile=$RUNNER_TEMP/${path.basename(
+      actualKnownHostsPath
+    )}"`
+    expect(git.setEnvironmentVariable).toHaveBeenCalledWith(
+      'GIT_SSH_COMMAND',
+      expectedSshCommand
+    )
+
+    // Asserty git config
+    const gitConfigLines = (await fs.promises.readFile(localGitConfigPath))
+      .toString()
+      .split('\n')
+      .filter(x => x)
+    expect(gitConfigLines).toHaveLength(1)
+    expect(gitConfigLines[0]).toMatch(/^http\./)
+  })
+
+  const configureAuth_setsSshCommandWhenPersistCredentialsTrue =
+    'sets SSH command when persist-credentials true'
+  it(configureAuth_setsSshCommandWhenPersistCredentialsTrue, async () => {
+    if (!sshPath) {
+      process.stdout.write(
+        `Skipped test "${configureAuth_setsSshCommandWhenPersistCredentialsTrue}". Executable 'ssh' not found in the PATH.\n`
+      )
+      return
+    }
+
+    // Arrange
+    await setup(configureAuth_setsSshCommandWhenPersistCredentialsTrue)
+    const authHelper = gitAuthHelper.createAuthHelper(git, settings)
+
+    // Act
+    await authHelper.configureAuth()
+
+    // Assert git env var
+    const actualKeyPath = await getActualSshKeyPath()
+    const actualKnownHostsPath = await getActualSshKnownHostsPath()
+    const expectedSshCommand = `"${sshPath}" -i "$RUNNER_TEMP/${path.basename(
+      actualKeyPath
+    )}" -o StrictHostKeyChecking=yes -o CheckHostIP=no -o "UserKnownHostsFile=$RUNNER_TEMP/${path.basename(
+      actualKnownHostsPath
+    )}"`
+    expect(git.setEnvironmentVariable).toHaveBeenCalledWith(
+      'GIT_SSH_COMMAND',
+      expectedSshCommand
+    )
+
+    // Asserty git config
+    expect(git.config).toHaveBeenCalledWith(
+      'core.sshCommand',
+      expectedSshCommand
+    )
+  })
+
+  const configureAuth_writesExplicitKnownHosts = 'writes explicit known hosts'
+  it(configureAuth_writesExplicitKnownHosts, async () => {
+    if (!sshPath) {
+      process.stdout.write(
+        `Skipped test "${configureAuth_writesExplicitKnownHosts}". Executable 'ssh' not found in the PATH.\n`
+      )
+      return
+    }
+
+    // Arrange
+    await setup(configureAuth_writesExplicitKnownHosts)
+    expect(settings.sshKey).toBeTruthy() // sanity check
+    settings.sshKnownHosts = 'my-custom-host.com ssh-rsa ABC123'
+    const authHelper = gitAuthHelper.createAuthHelper(git, settings)
+
+    // Act
+    await authHelper.configureAuth()
+
+    // Assert known hosts
+    const actualSshKnownHostsPath = await getActualSshKnownHostsPath()
+    const actualSshKnownHostsContent = (
+      await fs.promises.readFile(actualSshKnownHostsPath)
+    ).toString()
+    expect(actualSshKnownHostsContent).toMatch(
+      /my-custom-host\.com ssh-rsa ABC123/
+    )
+    expect(actualSshKnownHostsContent).toMatch(/github\.com ssh-rsa AAAAB3N/)
+  })
+
+  const configureAuth_writesSshKeyAndImplicitKnownHosts =
+    'writes SSH key and implicit known hosts'
+  it(configureAuth_writesSshKeyAndImplicitKnownHosts, async () => {
+    if (!sshPath) {
+      process.stdout.write(
+        `Skipped test "${configureAuth_writesSshKeyAndImplicitKnownHosts}". Executable 'ssh' not found in the PATH.\n`
+      )
+      return
+    }
+
+    // Arrange
+    await setup(configureAuth_writesSshKeyAndImplicitKnownHosts)
+    expect(settings.sshKey).toBeTruthy() // sanity check
+    const authHelper = gitAuthHelper.createAuthHelper(git, settings)
+
+    // Act
+    await authHelper.configureAuth()
+
+    // Assert SSH key
+    const actualSshKeyPath = await getActualSshKeyPath()
+    expect(actualSshKeyPath).toBeTruthy()
+    const actualSshKeyContent = (
+      await fs.promises.readFile(actualSshKeyPath)
+    ).toString()
+    expect(actualSshKeyContent).toBe(settings.sshKey + '\n')
+    if (!isWindows) {
+      // Assert read/write for user, not group or others.
+      // Otherwise SSH client will error.
+      expect((await fs.promises.stat(actualSshKeyPath)).mode & 0o777).toBe(
+        0o600
+      )
+    }
+
+    // Assert known hosts
+    const actualSshKnownHostsPath = await getActualSshKnownHostsPath()
+    const actualSshKnownHostsContent = (
+      await fs.promises.readFile(actualSshKnownHostsPath)
+    ).toString()
+    expect(actualSshKnownHostsContent).toMatch(/github\.com ssh-rsa AAAAB3N/)
+  })
+
+  const configureGlobalAuth_configuresUrlInsteadOfWhenSshKeyNotSet =
+    'configureGlobalAuth configures URL insteadOf when SSH key not set'
+  it(configureGlobalAuth_configuresUrlInsteadOfWhenSshKeyNotSet, async () => {
+    // Arrange
+    await setup(configureGlobalAuth_configuresUrlInsteadOfWhenSshKeyNotSet)
+    settings.sshKey = ''
+    const authHelper = gitAuthHelper.createAuthHelper(git, settings)
+
+    // Act
+    await authHelper.configureAuth()
+    await authHelper.configureGlobalAuth()
+
+    // Assert temporary global config
+    expect(git.env['HOME']).toBeTruthy()
+    const configContent = (
+      await fs.promises.readFile(path.join(git.env['HOME'], '.gitconfig'))
+    ).toString()
+    expect(
+      configContent.indexOf(`url.https://github.com/.insteadOf git@github.com`)
+    ).toBeGreaterThanOrEqual(0)
+  })
+
+  const configureGlobalAuth_copiesGlobalGitConfig =
+    'configureGlobalAuth copies global git config'
+  it(configureGlobalAuth_copiesGlobalGitConfig, async () => {
+    // Arrange
+    await setup(configureGlobalAuth_copiesGlobalGitConfig)
+    await fs.promises.writeFile(globalGitConfigPath, 'value-from-global-config')
+    const authHelper = gitAuthHelper.createAuthHelper(git, settings)
+
+    // Act
+    await authHelper.configureAuth()
+    await authHelper.configureGlobalAuth()
+
+    // Assert original global config not altered
+    let configContent = (
+      await fs.promises.readFile(globalGitConfigPath)
+    ).toString()
+    expect(configContent).toBe('value-from-global-config')
+
+    // Assert temporary global config
+    expect(git.env['HOME']).toBeTruthy()
+    const basicCredential = Buffer.from(
+      `x-access-token:${settings.authToken}`,
+      'utf8'
+    ).toString('base64')
+    configContent = (
+      await fs.promises.readFile(path.join(git.env['HOME'], '.gitconfig'))
+    ).toString()
+    expect(
+      configContent.indexOf('value-from-global-config')
+    ).toBeGreaterThanOrEqual(0)
+    expect(
+      configContent.indexOf(
+        `http.https://github.com/.extraheader AUTHORIZATION: basic ${basicCredential}`
+      )
+    ).toBeGreaterThanOrEqual(0)
+  })
+
+  const configureGlobalAuth_createsNewGlobalGitConfigWhenGlobalDoesNotExist =
+    'configureGlobalAuth creates new git config when global does not exist'
+  it(
+    configureGlobalAuth_createsNewGlobalGitConfigWhenGlobalDoesNotExist,
+    async () => {
+      // Arrange
+      await setup(
+        configureGlobalAuth_createsNewGlobalGitConfigWhenGlobalDoesNotExist
+      )
+      await io.rmRF(globalGitConfigPath)
+      const authHelper = gitAuthHelper.createAuthHelper(git, settings)
+
+      // Act
+      await authHelper.configureAuth()
+      await authHelper.configureGlobalAuth()
+
+      // Assert original global config not recreated
+      try {
+        await fs.promises.stat(globalGitConfigPath)
+        throw new Error(
+          `Did not expect file to exist: '${globalGitConfigPath}'`
+        )
+      } catch (err) {
+        if ((err as any)?.code !== 'ENOENT') {
+          throw err
+        }
+      }
+
+      // Assert temporary global config
+      expect(git.env['HOME']).toBeTruthy()
+      const basicCredential = Buffer.from(
+        `x-access-token:${settings.authToken}`,
+        'utf8'
+      ).toString('base64')
+      const configContent = (
+        await fs.promises.readFile(path.join(git.env['HOME'], '.gitconfig'))
+      ).toString()
+      expect(
+        configContent.indexOf(
+          `http.https://github.com/.extraheader AUTHORIZATION: basic ${basicCredential}`
+        )
+      ).toBeGreaterThanOrEqual(0)
+    }
+  )
+
+  const configureSubmoduleAuth_configuresSubmodulesWhenPersistCredentialsFalseAndSshKeyNotSet =
+    'configureSubmoduleAuth configures submodules when persist credentials false and SSH key not set'
+  it(
+    configureSubmoduleAuth_configuresSubmodulesWhenPersistCredentialsFalseAndSshKeyNotSet,
+    async () => {
+      // Arrange
+      await setup(
+        configureSubmoduleAuth_configuresSubmodulesWhenPersistCredentialsFalseAndSshKeyNotSet
+      )
+      settings.persistCredentials = false
+      settings.sshKey = ''
+      const authHelper = gitAuthHelper.createAuthHelper(git, settings)
+      await authHelper.configureAuth()
+      const mockSubmoduleForeach = git.submoduleForeach as jest.Mock<any, any>
+      mockSubmoduleForeach.mockClear() // reset calls
+
+      // Act
+      await authHelper.configureSubmoduleAuth()
+
+      // Assert
+      expect(mockSubmoduleForeach).toBeCalledTimes(1)
+      expect(mockSubmoduleForeach.mock.calls[0][0] as string).toMatch(
+        /unset-all.*insteadOf/
+      )
+    }
+  )
+
+  const configureSubmoduleAuth_configuresSubmodulesWhenPersistCredentialsFalseAndSshKeySet =
+    'configureSubmoduleAuth configures submodules when persist credentials false and SSH key set'
+  it(
+    configureSubmoduleAuth_configuresSubmodulesWhenPersistCredentialsFalseAndSshKeySet,
+    async () => {
+      if (!sshPath) {
+        process.stdout.write(
+          `Skipped test "${configureSubmoduleAuth_configuresSubmodulesWhenPersistCredentialsFalseAndSshKeySet}". Executable 'ssh' not found in the PATH.\n`
+        )
+        return
+      }
+
+      // Arrange
+      await setup(
+        configureSubmoduleAuth_configuresSubmodulesWhenPersistCredentialsFalseAndSshKeySet
+      )
+      settings.persistCredentials = false
+      const authHelper = gitAuthHelper.createAuthHelper(git, settings)
+      await authHelper.configureAuth()
+      const mockSubmoduleForeach = git.submoduleForeach as jest.Mock<any, any>
+      mockSubmoduleForeach.mockClear() // reset calls
+
+      // Act
+      await authHelper.configureSubmoduleAuth()
+
+      // Assert
+      expect(mockSubmoduleForeach).toHaveBeenCalledTimes(1)
+      expect(mockSubmoduleForeach.mock.calls[0][0]).toMatch(
+        /unset-all.*insteadOf/
+      )
+    }
+  )
+
+  const configureSubmoduleAuth_configuresSubmodulesWhenPersistCredentialsTrueAndSshKeyNotSet =
+    'configureSubmoduleAuth configures submodules when persist credentials true and SSH key not set'
+  it(
+    configureSubmoduleAuth_configuresSubmodulesWhenPersistCredentialsTrueAndSshKeyNotSet,
+    async () => {
+      // Arrange
+      await setup(
+        configureSubmoduleAuth_configuresSubmodulesWhenPersistCredentialsTrueAndSshKeyNotSet
+      )
+      settings.sshKey = ''
+      const authHelper = gitAuthHelper.createAuthHelper(git, settings)
+      await authHelper.configureAuth()
+      const mockSubmoduleForeach = git.submoduleForeach as jest.Mock<any, any>
+      mockSubmoduleForeach.mockClear() // reset calls
+
+      // Act
+      await authHelper.configureSubmoduleAuth()
+
+      // Assert
+      expect(mockSubmoduleForeach).toHaveBeenCalledTimes(4)
+      expect(mockSubmoduleForeach.mock.calls[0][0]).toMatch(
+        /unset-all.*insteadOf/
+      )
+      expect(mockSubmoduleForeach.mock.calls[1][0]).toMatch(/http.*extraheader/)
+      expect(mockSubmoduleForeach.mock.calls[2][0]).toMatch(
+        /url.*insteadOf.*git@github.com:/
+      )
+      expect(mockSubmoduleForeach.mock.calls[3][0]).toMatch(
+        /url.*insteadOf.*org-123456@github.com:/
+      )
+    }
+  )
+
+  const configureSubmoduleAuth_configuresSubmodulesWhenPersistCredentialsTrueAndSshKeySet =
+    'configureSubmoduleAuth configures submodules when persist credentials true and SSH key set'
+  it(
+    configureSubmoduleAuth_configuresSubmodulesWhenPersistCredentialsTrueAndSshKeySet,
+    async () => {
+      if (!sshPath) {
+        process.stdout.write(
+          `Skipped test "${configureSubmoduleAuth_configuresSubmodulesWhenPersistCredentialsTrueAndSshKeySet}". Executable 'ssh' not found in the PATH.\n`
+        )
+        return
+      }
+
+      // Arrange
+      await setup(
+        configureSubmoduleAuth_configuresSubmodulesWhenPersistCredentialsTrueAndSshKeySet
+      )
+      const authHelper = gitAuthHelper.createAuthHelper(git, settings)
+      await authHelper.configureAuth()
+      const mockSubmoduleForeach = git.submoduleForeach as jest.Mock<any, any>
+      mockSubmoduleForeach.mockClear() // reset calls
+
+      // Act
+      await authHelper.configureSubmoduleAuth()
+
+      // Assert
+      expect(mockSubmoduleForeach).toHaveBeenCalledTimes(3)
+      expect(mockSubmoduleForeach.mock.calls[0][0]).toMatch(
+        /unset-all.*insteadOf/
+      )
+      expect(mockSubmoduleForeach.mock.calls[1][0]).toMatch(/http.*extraheader/)
+      expect(mockSubmoduleForeach.mock.calls[2][0]).toMatch(/core\.sshCommand/)
+    }
+  )
+
+  const removeAuth_removesSshCommand = 'removeAuth removes SSH command'
+  it(removeAuth_removesSshCommand, async () => {
+    if (!sshPath) {
+      process.stdout.write(
+        `Skipped test "${removeAuth_removesSshCommand}". Executable 'ssh' not found in the PATH.\n`
+      )
+      return
+    }
+
+    // Arrange
+    await setup(removeAuth_removesSshCommand)
+    const authHelper = gitAuthHelper.createAuthHelper(git, settings)
+    await authHelper.configureAuth()
+    let gitConfigContent = (
+      await fs.promises.readFile(localGitConfigPath)
+    ).toString()
+    expect(gitConfigContent.indexOf('core.sshCommand')).toBeGreaterThanOrEqual(
+      0
+    ) // sanity check
+    const actualKeyPath = await getActualSshKeyPath()
+    expect(actualKeyPath).toBeTruthy()
+    await fs.promises.stat(actualKeyPath)
+    const actualKnownHostsPath = await getActualSshKnownHostsPath()
+    expect(actualKnownHostsPath).toBeTruthy()
+    await fs.promises.stat(actualKnownHostsPath)
+
+    // Act
+    await authHelper.removeAuth()
+
+    // Assert git config
+    gitConfigContent = (
+      await fs.promises.readFile(localGitConfigPath)
+    ).toString()
+    expect(gitConfigContent.indexOf('core.sshCommand')).toBeLessThan(0)
+
+    // Assert SSH key file
+    try {
+      await fs.promises.stat(actualKeyPath)
+      throw new Error('SSH key should have been deleted')
+    } catch (err) {
+      if ((err as any)?.code !== 'ENOENT') {
+        throw err
+      }
+    }
+
+    // Assert known hosts file
+    try {
+      await fs.promises.stat(actualKnownHostsPath)
+      throw new Error('SSH known hosts should have been deleted')
+    } catch (err) {
+      if ((err as any)?.code !== 'ENOENT') {
+        throw err
+      }
+    }
+  })
+
+  const removeAuth_removesToken = 'removeAuth removes token'
+  it(removeAuth_removesToken, async () => {
+    // Arrange
+    await setup(removeAuth_removesToken)
+    const authHelper = gitAuthHelper.createAuthHelper(git, settings)
+    await authHelper.configureAuth()
+    let gitConfigContent = (
+      await fs.promises.readFile(localGitConfigPath)
+    ).toString()
+    expect(gitConfigContent.indexOf('http.')).toBeGreaterThanOrEqual(0) // sanity check
+
+    // Act
+    await authHelper.removeAuth()
+
+    // Assert git config
+    gitConfigContent = (
+      await fs.promises.readFile(localGitConfigPath)
+    ).toString()
+    expect(gitConfigContent.indexOf('http.')).toBeLessThan(0)
+  })
+
+  const removeGlobalConfig_removesOverride =
+    'removeGlobalConfig removes override'
+  it(removeGlobalConfig_removesOverride, async () => {
+    // Arrange
+    await setup(removeGlobalConfig_removesOverride)
+    const authHelper = gitAuthHelper.createAuthHelper(git, settings)
+    await authHelper.configureAuth()
+    await authHelper.configureGlobalAuth()
+    const homeOverride = git.env['HOME'] // Sanity check
+    expect(homeOverride).toBeTruthy()
+    await fs.promises.stat(path.join(git.env['HOME'], '.gitconfig'))
+
+    // Act
+    await authHelper.removeGlobalConfig()
+
+    // Assert
+    expect(git.env['HOME']).toBeUndefined()
+    try {
+      await fs.promises.stat(homeOverride)
+      throw new Error(`Should have been deleted '${homeOverride}'`)
+    } catch (err) {
+      if ((err as any)?.code !== 'ENOENT') {
+        throw err
+      }
+    }
+  })
+})
+
+async function setup(testName: string): Promise<void> {
+  testName = testName.replace(/[^a-zA-Z0-9_]+/g, '-')
+
+  // Directories
+  workspace = path.join(testWorkspace, testName, 'workspace')
+  runnerTemp = path.join(testWorkspace, testName, 'runner-temp')
+  tempHomedir = path.join(testWorkspace, testName, 'home-dir')
+  await fs.promises.mkdir(workspace, {recursive: true})
+  await fs.promises.mkdir(runnerTemp, {recursive: true})
+  await fs.promises.mkdir(tempHomedir, {recursive: true})
+  process.env['RUNNER_TEMP'] = runnerTemp
+  process.env['HOME'] = tempHomedir
+
+  // Create git config
+  globalGitConfigPath = path.join(tempHomedir, '.gitconfig')
+  await fs.promises.writeFile(globalGitConfigPath, '')
+  localGitConfigPath = path.join(workspace, '.git', 'config')
+  await fs.promises.mkdir(path.dirname(localGitConfigPath), {recursive: true})
+  await fs.promises.writeFile(localGitConfigPath, '')
+
+  git = {
+    branchDelete: jest.fn(),
+    branchExists: jest.fn(),
+    branchList: jest.fn(),
+    checkout: jest.fn(),
+    checkoutDetach: jest.fn(),
+    config: jest.fn(
+      async (key: string, value: string, globalConfig?: boolean) => {
+        const configPath = globalConfig
+          ? path.join(git.env['HOME'] || tempHomedir, '.gitconfig')
+          : localGitConfigPath
+        await fs.promises.appendFile(configPath, `\n${key} ${value}`)
+      }
+    ),
+    configExists: jest.fn(
+      async (key: string, globalConfig?: boolean): Promise<boolean> => {
+        const configPath = globalConfig
+          ? path.join(git.env['HOME'] || tempHomedir, '.gitconfig')
+          : localGitConfigPath
+        const content = await fs.promises.readFile(configPath)
+        const lines = content
+          .toString()
+          .split('\n')
+          .filter(x => x)
+        return lines.some(x => x.startsWith(key))
+      }
+    ),
+    env: {},
+    fetch: jest.fn(),
+    getDefaultBranch: jest.fn(),
+    getWorkingDirectory: jest.fn(() => workspace),
+    init: jest.fn(),
+    isDetached: jest.fn(),
+    lfsFetch: jest.fn(),
+    lfsInstall: jest.fn(),
+    log1: jest.fn(),
+    remoteAdd: jest.fn(),
+    removeEnvironmentVariable: jest.fn((name: string) => delete git.env[name]),
+    revParse: jest.fn(),
+    setEnvironmentVariable: jest.fn((name: string, value: string) => {
+      git.env[name] = value
+    }),
+    shaExists: jest.fn(),
+    submoduleForeach: jest.fn(async () => {
+      return ''
+    }),
+    submoduleSync: jest.fn(),
+    submoduleUpdate: jest.fn(),
+    tagExists: jest.fn(),
+    tryClean: jest.fn(),
+    tryConfigUnset: jest.fn(
+      async (key: string, globalConfig?: boolean): Promise<boolean> => {
+        const configPath = globalConfig
+          ? path.join(git.env['HOME'] || tempHomedir, '.gitconfig')
+          : localGitConfigPath
+        let content = await fs.promises.readFile(configPath)
+        let lines = content
+          .toString()
+          .split('\n')
+          .filter(x => x)
+          .filter(x => !x.startsWith(key))
+        await fs.promises.writeFile(configPath, lines.join('\n'))
+        return true
+      }
+    ),
+    tryDisableAutomaticGarbageCollection: jest.fn(),
+    tryGetFetchUrl: jest.fn(),
+    tryReset: jest.fn()
+  }
+
+  settings = {
+    authToken: 'some auth token',
+    clean: true,
+    commit: '',
+    fetchDepth: 1,
+    lfs: false,
+    submodules: false,
+    nestedSubmodules: false,
+    persistCredentials: true,
+    ref: 'refs/heads/main',
+    repositoryName: 'my-repo',
+    repositoryOwner: 'my-org',
+    repositoryPath: '',
+    sshKey: sshPath ? 'some ssh private key' : '',
+    sshKnownHosts: '',
+    sshStrict: true,
+    workflowOrganizationId: 123456,
+    setSafeDirectory: true
+  }
+}
+
+async function getActualSshKeyPath(): Promise<string> {
+  let actualTempFiles = (await fs.promises.readdir(runnerTemp))
+    .sort()
+    .map(x => path.join(runnerTemp, x))
+  if (actualTempFiles.length === 0) {
+    return ''
+  }
+
+  expect(actualTempFiles).toHaveLength(2)
+  expect(actualTempFiles[0].endsWith('_known_hosts')).toBeFalsy()
+  return actualTempFiles[0]
+}
+
+async function getActualSshKnownHostsPath(): Promise<string> {
+  let actualTempFiles = (await fs.promises.readdir(runnerTemp))
+    .sort()
+    .map(x => path.join(runnerTemp, x))
+  if (actualTempFiles.length === 0) {
+    return ''
+  }
+
+  expect(actualTempFiles).toHaveLength(2)
+  expect(actualTempFiles[1].endsWith('_known_hosts')).toBeTruthy()
+  expect(actualTempFiles[1].startsWith(actualTempFiles[0])).toBeTruthy()
+  return actualTempFiles[1]
+}

__test__/git-directory-helper.test.ts

@@ -0,0 +1,441 @@
+import * as core from '@actions/core'
+import * as fs from 'fs'
+import * as gitDirectoryHelper from '../lib/git-directory-helper'
+import * as io from '@actions/io'
+import * as path from 'path'
+import {IGitCommandManager} from '../lib/git-command-manager'
+
+const testWorkspace = path.join(__dirname, '_temp', 'git-directory-helper')
+let repositoryPath: string
+let repositoryUrl: string
+let clean: boolean
+let ref: string
+let git: IGitCommandManager
+
+describe('git-directory-helper tests', () => {
+  beforeAll(async () => {
+    // Clear test workspace
+    await io.rmRF(testWorkspace)
+  })
+
+  beforeEach(() => {
+    // Mock error/warning/info/debug
+    jest.spyOn(core, 'error').mockImplementation(jest.fn())
+    jest.spyOn(core, 'warning').mockImplementation(jest.fn())
+    jest.spyOn(core, 'info').mockImplementation(jest.fn())
+    jest.spyOn(core, 'debug').mockImplementation(jest.fn())
+  })
+
+  afterEach(() => {
+    // Unregister mocks
+    jest.restoreAllMocks()
+  })
+
+  const cleansWhenCleanTrue = 'cleans when clean true'
+  it(cleansWhenCleanTrue, async () => {
+    // Arrange
+    await setup(cleansWhenCleanTrue)
+    await fs.promises.writeFile(path.join(repositoryPath, 'my-file'), '')
+
+    // Act
+    await gitDirectoryHelper.prepareExistingDirectory(
+      git,
+      repositoryPath,
+      repositoryUrl,
+      clean,
+      ref
+    )
+
+    // Assert
+    const files = await fs.promises.readdir(repositoryPath)
+    expect(files.sort()).toEqual(['.git', 'my-file'])
+    expect(git.tryClean).toHaveBeenCalled()
+    expect(git.tryReset).toHaveBeenCalled()
+    expect(core.warning).not.toHaveBeenCalled()
+  })
+
+  const checkoutDetachWhenNotDetached = 'checkout detach when not detached'
+  it(checkoutDetachWhenNotDetached, async () => {
+    // Arrange
+    await setup(checkoutDetachWhenNotDetached)
+    await fs.promises.writeFile(path.join(repositoryPath, 'my-file'), '')
+
+    // Act
+    await gitDirectoryHelper.prepareExistingDirectory(
+      git,
+      repositoryPath,
+      repositoryUrl,
+      clean,
+      ref
+    )
+
+    // Assert
+    const files = await fs.promises.readdir(repositoryPath)
+    expect(files.sort()).toEqual(['.git', 'my-file'])
+    expect(git.checkoutDetach).toHaveBeenCalled()
+  })
+
+  const doesNotCheckoutDetachWhenNotAlreadyDetached =
+    'does not checkout detach when already detached'
+  it(doesNotCheckoutDetachWhenNotAlreadyDetached, async () => {
+    // Arrange
+    await setup(doesNotCheckoutDetachWhenNotAlreadyDetached)
+    await fs.promises.writeFile(path.join(repositoryPath, 'my-file'), '')
+    const mockIsDetached = git.isDetached as jest.Mock<any, any>
+    mockIsDetached.mockImplementation(async () => {
+      return true
+    })
+
+    // Act
+    await gitDirectoryHelper.prepareExistingDirectory(
+      git,
+      repositoryPath,
+      repositoryUrl,
+      clean,
+      ref
+    )
+
+    // Assert
+    const files = await fs.promises.readdir(repositoryPath)
+    expect(files.sort()).toEqual(['.git', 'my-file'])
+    expect(git.checkoutDetach).not.toHaveBeenCalled()
+  })
+
+  const doesNotCleanWhenCleanFalse = 'does not clean when clean false'
+  it(doesNotCleanWhenCleanFalse, async () => {
+    // Arrange
+    await setup(doesNotCleanWhenCleanFalse)
+    clean = false
+    await fs.promises.writeFile(path.join(repositoryPath, 'my-file'), '')
+
+    // Act
+    await gitDirectoryHelper.prepareExistingDirectory(
+      git,
+      repositoryPath,
+      repositoryUrl,
+      clean,
+      ref
+    )
+
+    // Assert
+    const files = await fs.promises.readdir(repositoryPath)
+    expect(files.sort()).toEqual(['.git', 'my-file'])
+    expect(git.isDetached).toHaveBeenCalled()
+    expect(git.branchList).toHaveBeenCalled()
+    expect(core.warning).not.toHaveBeenCalled()
+    expect(git.tryClean).not.toHaveBeenCalled()
+    expect(git.tryReset).not.toHaveBeenCalled()
+  })
+
+  const removesContentsWhenCleanFails = 'removes contents when clean fails'
+  it(removesContentsWhenCleanFails, async () => {
+    // Arrange
+    await setup(removesContentsWhenCleanFails)
+    await fs.promises.writeFile(path.join(repositoryPath, 'my-file'), '')
+    let mockTryClean = git.tryClean as jest.Mock<any, any>
+    mockTryClean.mockImplementation(async () => {
+      return false
+    })
+
+    // Act
+    await gitDirectoryHelper.prepareExistingDirectory(
+      git,
+      repositoryPath,
+      repositoryUrl,
+      clean,
+      ref
+    )
+
+    // Assert
+    const files = await fs.promises.readdir(repositoryPath)
+    expect(files).toHaveLength(0)
+    expect(git.tryClean).toHaveBeenCalled()
+    expect(core.warning).toHaveBeenCalled()
+    expect(git.tryReset).not.toHaveBeenCalled()
+  })
+
+  const removesContentsWhenDifferentRepositoryUrl =
+    'removes contents when different repository url'
+  it(removesContentsWhenDifferentRepositoryUrl, async () => {
+    // Arrange
+    await setup(removesContentsWhenDifferentRepositoryUrl)
+    clean = false
+    await fs.promises.writeFile(path.join(repositoryPath, 'my-file'), '')
+    const differentRepositoryUrl =
+      'https://github.com/my-different-org/my-different-repo'
+
+    // Act
+    await gitDirectoryHelper.prepareExistingDirectory(
+      git,
+      repositoryPath,
+      differentRepositoryUrl,
+      clean,
+      ref
+    )
+
+    // Assert
+    const files = await fs.promises.readdir(repositoryPath)
+    expect(files).toHaveLength(0)
+    expect(core.warning).not.toHaveBeenCalled()
+    expect(git.isDetached).not.toHaveBeenCalled()
+  })
+
+  const removesContentsWhenNoGitDirectory =
+    'removes contents when no git directory'
+  it(removesContentsWhenNoGitDirectory, async () => {
+    // Arrange
+    await setup(removesContentsWhenNoGitDirectory)
+    clean = false
+    await io.rmRF(path.join(repositoryPath, '.git'))
+    await fs.promises.writeFile(path.join(repositoryPath, 'my-file'), '')
+
+    // Act
+    await gitDirectoryHelper.prepareExistingDirectory(
+      git,
+      repositoryPath,
+      repositoryUrl,
+      clean,
+      ref
+    )
+
+    // Assert
+    const files = await fs.promises.readdir(repositoryPath)
+    expect(files).toHaveLength(0)
+    expect(core.warning).not.toHaveBeenCalled()
+    expect(git.isDetached).not.toHaveBeenCalled()
+  })
+
+  const removesContentsWhenResetFails = 'removes contents when reset fails'
+  it(removesContentsWhenResetFails, async () => {
+    // Arrange
+    await setup(removesContentsWhenResetFails)
+    await fs.promises.writeFile(path.join(repositoryPath, 'my-file'), '')
+    let mockTryReset = git.tryReset as jest.Mock<any, any>
+    mockTryReset.mockImplementation(async () => {
+      return false
+    })
+
+    // Act
+    await gitDirectoryHelper.prepareExistingDirectory(
+      git,
+      repositoryPath,
+      repositoryUrl,
+      clean,
+      ref
+    )
+
+    // Assert
+    const files = await fs.promises.readdir(repositoryPath)
+    expect(files).toHaveLength(0)
+    expect(git.tryClean).toHaveBeenCalled()
+    expect(git.tryReset).toHaveBeenCalled()
+    expect(core.warning).toHaveBeenCalled()
+  })
+
+  const removesContentsWhenUndefinedGitCommandManager =
+    'removes contents when undefined git command manager'
+  it(removesContentsWhenUndefinedGitCommandManager, async () => {
+    // Arrange
+    await setup(removesContentsWhenUndefinedGitCommandManager)
+    clean = false
+    await fs.promises.writeFile(path.join(repositoryPath, 'my-file'), '')
+
+    // Act
+    await gitDirectoryHelper.prepareExistingDirectory(
+      undefined,
+      repositoryPath,
+      repositoryUrl,
+      clean,
+      ref
+    )
+
+    // Assert
+    const files = await fs.promises.readdir(repositoryPath)
+    expect(files).toHaveLength(0)
+    expect(core.warning).not.toHaveBeenCalled()
+  })
+
+  const removesLocalBranches = 'removes local branches'
+  it(removesLocalBranches, async () => {
+    // Arrange
+    await setup(removesLocalBranches)
+    await fs.promises.writeFile(path.join(repositoryPath, 'my-file'), '')
+    const mockBranchList = git.branchList as jest.Mock<any, any>
+    mockBranchList.mockImplementation(async (remote: boolean) => {
+      return remote ? [] : ['local-branch-1', 'local-branch-2']
+    })
+
+    // Act
+    await gitDirectoryHelper.prepareExistingDirectory(
+      git,
+      repositoryPath,
+      repositoryUrl,
+      clean,
+      ref
+    )
+
+    // Assert
+    const files = await fs.promises.readdir(repositoryPath)
+    expect(files.sort()).toEqual(['.git', 'my-file'])
+    expect(git.branchDelete).toHaveBeenCalledWith(false, 'local-branch-1')
+    expect(git.branchDelete).toHaveBeenCalledWith(false, 'local-branch-2')
+  })
+
+  const removesLockFiles = 'removes lock files'
+  it(removesLockFiles, async () => {
+    // Arrange
+    await setup(removesLockFiles)
+    clean = false
+    await fs.promises.writeFile(
+      path.join(repositoryPath, '.git', 'index.lock'),
+      ''
+    )
+    await fs.promises.writeFile(
+      path.join(repositoryPath, '.git', 'shallow.lock'),
+      ''
+    )
+    await fs.promises.writeFile(path.join(repositoryPath, 'my-file'), '')
+
+    // Act
+    await gitDirectoryHelper.prepareExistingDirectory(
+      git,
+      repositoryPath,
+      repositoryUrl,
+      clean,
+      ref
+    )
+
+    // Assert
+    let files = await fs.promises.readdir(path.join(repositoryPath, '.git'))
+    expect(files).toHaveLength(0)
+    files = await fs.promises.readdir(repositoryPath)
+    expect(files.sort()).toEqual(['.git', 'my-file'])
+    expect(git.isDetached).toHaveBeenCalled()
+    expect(git.branchList).toHaveBeenCalled()
+    expect(core.warning).not.toHaveBeenCalled()
+    expect(git.tryClean).not.toHaveBeenCalled()
+    expect(git.tryReset).not.toHaveBeenCalled()
+  })
+
+  const removesAncestorRemoteBranch = 'removes ancestor remote branch'
+  it(removesAncestorRemoteBranch, async () => {
+    // Arrange
+    await setup(removesAncestorRemoteBranch)
+    await fs.promises.writeFile(path.join(repositoryPath, 'my-file'), '')
+    const mockBranchList = git.branchList as jest.Mock<any, any>
+    mockBranchList.mockImplementation(async (remote: boolean) => {
+      return remote ? ['origin/remote-branch-1', 'origin/remote-branch-2'] : []
+    })
+    ref = 'remote-branch-1/conflict'
+
+    // Act
+    await gitDirectoryHelper.prepareExistingDirectory(
+      git,
+      repositoryPath,
+      repositoryUrl,
+      clean,
+      ref
+    )
+
+    // Assert
+    const files = await fs.promises.readdir(repositoryPath)
+    expect(files.sort()).toEqual(['.git', 'my-file'])
+    expect(git.branchDelete).toHaveBeenCalledTimes(1)
+    expect(git.branchDelete).toHaveBeenCalledWith(
+      true,
+      'origin/remote-branch-1'
+    )
+  })
+
+  const removesDescendantRemoteBranches = 'removes descendant remote branch'
+  it(removesDescendantRemoteBranches, async () => {
+    // Arrange
+    await setup(removesDescendantRemoteBranches)
+    await fs.promises.writeFile(path.join(repositoryPath, 'my-file'), '')
+    const mockBranchList = git.branchList as jest.Mock<any, any>
+    mockBranchList.mockImplementation(async (remote: boolean) => {
+      return remote
+        ? ['origin/remote-branch-1/conflict', 'origin/remote-branch-2']
+        : []
+    })
+    ref = 'remote-branch-1'
+
+    // Act
+    await gitDirectoryHelper.prepareExistingDirectory(
+      git,
+      repositoryPath,
+      repositoryUrl,
+      clean,
+      ref
+    )
+
+    // Assert
+    const files = await fs.promises.readdir(repositoryPath)
+    expect(files.sort()).toEqual(['.git', 'my-file'])
+    expect(git.branchDelete).toHaveBeenCalledTimes(1)
+    expect(git.branchDelete).toHaveBeenCalledWith(
+      true,
+      'origin/remote-branch-1/conflict'
+    )
+  })
+})
+
+async function setup(testName: string): Promise<void> {
+  testName = testName.replace(/[^a-zA-Z0-9_]+/g, '-')
+
+  // Repository directory
+  repositoryPath = path.join(testWorkspace, testName)
+  await fs.promises.mkdir(path.join(repositoryPath, '.git'), {recursive: true})
+
+  // Repository URL
+  repositoryUrl = 'https://github.com/my-org/my-repo'
+
+  // Clean
+  clean = true
+
+  // Ref
+  ref = ''
+
+  // Git command manager
+  git = {
+    branchDelete: jest.fn(),
+    branchExists: jest.fn(),
+    branchList: jest.fn(async () => {
+      return []
+    }),
+    checkout: jest.fn(),
+    checkoutDetach: jest.fn(),
+    config: jest.fn(),
+    configExists: jest.fn(),
+    fetch: jest.fn(),
+    getDefaultBranch: jest.fn(),
+    getWorkingDirectory: jest.fn(() => repositoryPath),
+    init: jest.fn(),
+    isDetached: jest.fn(),
+    lfsFetch: jest.fn(),
+    lfsInstall: jest.fn(),
+    log1: jest.fn(),
+    remoteAdd: jest.fn(),
+    removeEnvironmentVariable: jest.fn(),
+    revParse: jest.fn(),
+    setEnvironmentVariable: jest.fn(),
+    shaExists: jest.fn(),
+    submoduleForeach: jest.fn(),
+    submoduleSync: jest.fn(),
+    submoduleUpdate: jest.fn(),
+    tagExists: jest.fn(),
+    tryClean: jest.fn(async () => {
+      return true
+    }),
+    tryConfigUnset: jest.fn(),
+    tryDisableAutomaticGarbageCollection: jest.fn(),
+    tryGetFetchUrl: jest.fn(async () => {
+      // Sanity check - this function shouldn't be called when the .git directory doesn't exist
+      await fs.promises.stat(path.join(repositoryPath, '.git'))
+      return repositoryUrl
+    }),
+    tryReset: jest.fn(async () => {
+      return true
+    })
+  }
+}

__test__/git-version.test.ts

@@ -0,0 +1,45 @@
+import {GitVersion} from '../lib/git-version'
+
+describe('git-version tests', () => {
+  it('basics', async () => {
+    let version = new GitVersion('')
+    expect(version.isValid()).toBeFalsy()
+
+    version = new GitVersion('asdf')
+    expect(version.isValid()).toBeFalsy()
+
+    version = new GitVersion('1.2')
+    expect(version.isValid()).toBeTruthy()
+    expect(version.toString()).toBe('1.2')
+
+    version = new GitVersion('1.2.3')
+    expect(version.isValid()).toBeTruthy()
+    expect(version.toString()).toBe('1.2.3')
+  })
+
+  it('check minimum', async () => {
+    let version = new GitVersion('4.5')
+    expect(version.checkMinimum(new GitVersion('3.6'))).toBeTruthy()
+    expect(version.checkMinimum(new GitVersion('3.6.7'))).toBeTruthy()
+    expect(version.checkMinimum(new GitVersion('4.4'))).toBeTruthy()
+    expect(version.checkMinimum(new GitVersion('4.5'))).toBeTruthy()
+    expect(version.checkMinimum(new GitVersion('4.5.0'))).toBeTruthy()
+    expect(version.checkMinimum(new GitVersion('4.6'))).toBeFalsy()
+    expect(version.checkMinimum(new GitVersion('4.6.0'))).toBeFalsy()
+    expect(version.checkMinimum(new GitVersion('5.1'))).toBeFalsy()
+    expect(version.checkMinimum(new GitVersion('5.1.2'))).toBeFalsy()
+
+    version = new GitVersion('4.5.6')
+    expect(version.checkMinimum(new GitVersion('3.6'))).toBeTruthy()
+    expect(version.checkMinimum(new GitVersion('3.6.7'))).toBeTruthy()
+    expect(version.checkMinimum(new GitVersion('4.4'))).toBeTruthy()
+    expect(version.checkMinimum(new GitVersion('4.5'))).toBeTruthy()
+    expect(version.checkMinimum(new GitVersion('4.5.5'))).toBeTruthy()
+    expect(version.checkMinimum(new GitVersion('4.5.6'))).toBeTruthy()
+    expect(version.checkMinimum(new GitVersion('4.5.7'))).toBeFalsy()
+    expect(version.checkMinimum(new GitVersion('4.6'))).toBeFalsy()
+    expect(version.checkMinimum(new GitVersion('4.6.0'))).toBeFalsy()
+    expect(version.checkMinimum(new GitVersion('5.1'))).toBeFalsy()
+    expect(version.checkMinimum(new GitVersion('5.1.2'))).toBeFalsy()
+  })
+})

__test__/input-helper.test.ts

@@ -0,0 +1,142 @@
+import * as core from '@actions/core'
+import * as fsHelper from '../lib/fs-helper'
+import * as github from '@actions/github'
+import * as inputHelper from '../lib/input-helper'
+import * as path from 'path'
+import * as workflowContextHelper from '../lib/workflow-context-helper'
+import {IGitSourceSettings} from '../lib/git-source-settings'
+
+const originalGitHubWorkspace = process.env['GITHUB_WORKSPACE']
+const gitHubWorkspace = path.resolve('/checkout-tests/workspace')
+
+// Inputs for mock @actions/core
+let inputs = {} as any
+
+// Shallow clone original @actions/github context
+let originalContext = {...github.context}
+
+describe('input-helper tests', () => {
+  beforeAll(() => {
+    // Mock getInput
+    jest.spyOn(core, 'getInput').mockImplementation((name: string) => {
+      return inputs[name]
+    })
+
+    // Mock error/warning/info/debug
+    jest.spyOn(core, 'error').mockImplementation(jest.fn())
+    jest.spyOn(core, 'warning').mockImplementation(jest.fn())
+    jest.spyOn(core, 'info').mockImplementation(jest.fn())
+    jest.spyOn(core, 'debug').mockImplementation(jest.fn())
+
+    // Mock github context
+    jest.spyOn(github.context, 'repo', 'get').mockImplementation(() => {
+      return {
+        owner: 'some-owner',
+        repo: 'some-repo'
+      }
+    })
+    github.context.ref = 'refs/heads/some-ref'
+    github.context.sha = '1234567890123456789012345678901234567890'
+
+    // Mock ./fs-helper directoryExistsSync()
+    jest
+      .spyOn(fsHelper, 'directoryExistsSync')
+      .mockImplementation((path: string) => path == gitHubWorkspace)
+
+    // Mock ./workflowContextHelper getOrganizationId()
+    jest
+      .spyOn(workflowContextHelper, 'getOrganizationId')
+      .mockImplementation(() => Promise.resolve(123456))
+
+    // GitHub workspace
+    process.env['GITHUB_WORKSPACE'] = gitHubWorkspace
+  })
+
+  beforeEach(() => {
+    // Reset inputs
+    inputs = {}
+  })
+
+  afterAll(() => {
+    // Restore GitHub workspace
+    delete process.env['GITHUB_WORKSPACE']
+    if (originalGitHubWorkspace) {
+      process.env['GITHUB_WORKSPACE'] = originalGitHubWorkspace
+    }
+
+    // Restore @actions/github context
+    github.context.ref = originalContext.ref
+    github.context.sha = originalContext.sha
+
+    // Restore
+    jest.restoreAllMocks()
+  })
+
+  it('sets defaults', async () => {
+    const settings: IGitSourceSettings = await inputHelper.getInputs()
+    expect(settings).toBeTruthy()
+    expect(settings.authToken).toBeFalsy()
+    expect(settings.clean).toBe(true)
+    expect(settings.commit).toBeTruthy()
+    expect(settings.commit).toBe('1234567890123456789012345678901234567890')
+    expect(settings.fetchDepth).toBe(1)
+    expect(settings.lfs).toBe(false)
+    expect(settings.ref).toBe('refs/heads/some-ref')
+    expect(settings.repositoryName).toBe('some-repo')
+    expect(settings.repositoryOwner).toBe('some-owner')
+    expect(settings.repositoryPath).toBe(gitHubWorkspace)
+    expect(settings.setSafeDirectory).toBe(true)
+  })
+
+  it('qualifies ref', async () => {
+    let originalRef = github.context.ref
+    try {
+      github.context.ref = 'some-unqualified-ref'
+      const settings: IGitSourceSettings = await inputHelper.getInputs()
+      expect(settings).toBeTruthy()
+      expect(settings.commit).toBe('1234567890123456789012345678901234567890')
+      expect(settings.ref).toBe('refs/heads/some-unqualified-ref')
+    } finally {
+      github.context.ref = originalRef
+    }
+  })
+
+  it('requires qualified repo', async () => {
+    inputs.repository = 'some-unqualified-repo'
+    try {
+      await inputHelper.getInputs()
+      throw 'should not reach here'
+    } catch (err) {
+      expect(`(${(err as any).message}`).toMatch(
+        "Invalid repository 'some-unqualified-repo'"
+      )
+    }
+  })
+
+  it('roots path', async () => {
+    inputs.path = 'some-directory/some-subdirectory'
+    const settings: IGitSourceSettings = await inputHelper.getInputs()
+    expect(settings.repositoryPath).toBe(
+      path.join(gitHubWorkspace, 'some-directory', 'some-subdirectory')
+    )
+  })
+
+  it('sets ref to empty when explicit sha', async () => {
+    inputs.ref = '1111111111222222222233333333334444444444'
+    const settings: IGitSourceSettings = await inputHelper.getInputs()
+    expect(settings.ref).toBeFalsy()
+    expect(settings.commit).toBe('1111111111222222222233333333334444444444')
+  })
+
+  it('sets sha to empty when explicit ref', async () => {
+    inputs.ref = 'refs/heads/some-other-ref'
+    const settings: IGitSourceSettings = await inputHelper.getInputs()
+    expect(settings.ref).toBe('refs/heads/some-other-ref')
+    expect(settings.commit).toBeFalsy()
+  })
+
+  it('sets workflow organization ID', async () => {
+    const settings: IGitSourceSettings = await inputHelper.getInputs()
+    expect(settings.workflowOrganizationId).toBe(123456)
+  })
+})

__test__/modify-work-tree.sh

@@ -0,0 +1,10 @@
+#!/bin/bash
+
+if [ ! -f "./basic/basic-file.txt" ]; then
+    echo "Expected basic file does not exist"
+    exit 1
+fi
+
+echo hello >> ./basic/basic-file.txt
+echo hello >> ./basic/new-file.txt
+git -C ./basic status

__test__/override-git-version.cmd

@@ -0,0 +1,6 @@
+
+mkdir override-git-version
+cd override-git-version
+echo @echo override git version 1.2.3 > git.cmd
+echo "%CD%" >> $GITHUB_PATH
+cd ..

__test__/override-git-version.sh

@@ -0,0 +1,9 @@
+#!/bin/sh
+
+mkdir override-git-version
+cd override-git-version
+echo "#!/bin/sh" > git
+echo "echo override git version 1.2.3" >> git
+chmod +x git
+echo "$(pwd)" >> $GITHUB_PATH
+cd ..

__test__/ref-helper.test.ts

@@ -0,0 +1,170 @@
+import * as assert from 'assert'
+import * as refHelper from '../lib/ref-helper'
+import {IGitCommandManager} from '../lib/git-command-manager'
+
+const commit = '1234567890123456789012345678901234567890'
+let git: IGitCommandManager
+
+describe('ref-helper tests', () => {
+  beforeEach(() => {
+    git = ({} as unknown) as IGitCommandManager
+  })
+
+  it('getCheckoutInfo requires git', async () => {
+    const git = (null as unknown) as IGitCommandManager
+    try {
+      await refHelper.getCheckoutInfo(git, 'refs/heads/my/branch', commit)
+      throw new Error('Should not reach here')
+    } catch (err) {
+      expect((err as any)?.message).toBe('Arg git cannot be empty')
+    }
+  })
+
+  it('getCheckoutInfo requires ref or commit', async () => {
+    try {
+      await refHelper.getCheckoutInfo(git, '', '')
+      throw new Error('Should not reach here')
+    } catch (err) {
+      expect((err as any)?.message).toBe(
+        'Args ref and commit cannot both be empty'
+      )
+    }
+  })
+
+  it('getCheckoutInfo sha only', async () => {
+    const checkoutInfo = await refHelper.getCheckoutInfo(git, '', commit)
+    expect(checkoutInfo.ref).toBe(commit)
+    expect(checkoutInfo.startPoint).toBeFalsy()
+  })
+
+  it('getCheckoutInfo refs/heads/', async () => {
+    const checkoutInfo = await refHelper.getCheckoutInfo(
+      git,
+      'refs/heads/my/branch',
+      commit
+    )
+    expect(checkoutInfo.ref).toBe('my/branch')
+    expect(checkoutInfo.startPoint).toBe('refs/remotes/origin/my/branch')
+  })
+
+  it('getCheckoutInfo refs/pull/', async () => {
+    const checkoutInfo = await refHelper.getCheckoutInfo(
+      git,
+      'refs/pull/123/merge',
+      commit
+    )
+    expect(checkoutInfo.ref).toBe('refs/remotes/pull/123/merge')
+    expect(checkoutInfo.startPoint).toBeFalsy()
+  })
+
+  it('getCheckoutInfo refs/tags/', async () => {
+    const checkoutInfo = await refHelper.getCheckoutInfo(
+      git,
+      'refs/tags/my-tag',
+      commit
+    )
+    expect(checkoutInfo.ref).toBe('refs/tags/my-tag')
+    expect(checkoutInfo.startPoint).toBeFalsy()
+  })
+
+  it('getCheckoutInfo unqualified branch only', async () => {
+    git.branchExists = jest.fn(async (remote: boolean, pattern: string) => {
+      return true
+    })
+
+    const checkoutInfo = await refHelper.getCheckoutInfo(git, 'my/branch', '')
+
+    expect(checkoutInfo.ref).toBe('my/branch')
+    expect(checkoutInfo.startPoint).toBe('refs/remotes/origin/my/branch')
+  })
+
+  it('getCheckoutInfo unqualified tag only', async () => {
+    git.branchExists = jest.fn(async (remote: boolean, pattern: string) => {
+      return false
+    })
+    git.tagExists = jest.fn(async (pattern: string) => {
+      return true
+    })
+
+    const checkoutInfo = await refHelper.getCheckoutInfo(git, 'my-tag', '')
+
+    expect(checkoutInfo.ref).toBe('refs/tags/my-tag')
+    expect(checkoutInfo.startPoint).toBeFalsy()
+  })
+
+  it('getCheckoutInfo unqualified ref only, not a branch or tag', async () => {
+    git.branchExists = jest.fn(async (remote: boolean, pattern: string) => {
+      return false
+    })
+    git.tagExists = jest.fn(async (pattern: string) => {
+      return false
+    })
+
+    try {
+      await refHelper.getCheckoutInfo(git, 'my-ref', '')
+      throw new Error('Should not reach here')
+    } catch (err) {
+      expect((err as any)?.message).toBe(
+        "A branch or tag with the name 'my-ref' could not be found"
+      )
+    }
+  })
+
+  it('getRefSpec requires ref or commit', async () => {
+    assert.throws(
+      () => refHelper.getRefSpec('', ''),
+      /Args ref and commit cannot both be empty/
+    )
+  })
+
+  it('getRefSpec sha + refs/heads/', async () => {
+    const refSpec = refHelper.getRefSpec('refs/heads/my/branch', commit)
+    expect(refSpec.length).toBe(1)
+    expect(refSpec[0]).toBe(`+${commit}:refs/remotes/origin/my/branch`)
+  })
+
+  it('getRefSpec sha + refs/pull/', async () => {
+    const refSpec = refHelper.getRefSpec('refs/pull/123/merge', commit)
+    expect(refSpec.length).toBe(1)
+    expect(refSpec[0]).toBe(`+${commit}:refs/remotes/pull/123/merge`)
+  })
+
+  it('getRefSpec sha + refs/tags/', async () => {
+    const refSpec = refHelper.getRefSpec('refs/tags/my-tag', commit)
+    expect(refSpec.length).toBe(1)
+    expect(refSpec[0]).toBe(`+${commit}:refs/tags/my-tag`)
+  })
+
+  it('getRefSpec sha only', async () => {
+    const refSpec = refHelper.getRefSpec('', commit)
+    expect(refSpec.length).toBe(1)
+    expect(refSpec[0]).toBe(commit)
+  })
+
+  it('getRefSpec unqualified ref only', async () => {
+    const refSpec = refHelper.getRefSpec('my-ref', '')
+    expect(refSpec.length).toBe(2)
+    expect(refSpec[0]).toBe('+refs/heads/my-ref*:refs/remotes/origin/my-ref*')
+    expect(refSpec[1]).toBe('+refs/tags/my-ref*:refs/tags/my-ref*')
+  })
+
+  it('getRefSpec refs/heads/ only', async () => {
+    const refSpec = refHelper.getRefSpec('refs/heads/my/branch', '')
+    expect(refSpec.length).toBe(1)
+    expect(refSpec[0]).toBe(
+      '+refs/heads/my/branch:refs/remotes/origin/my/branch'
+    )
+  })
+
+  it('getRefSpec refs/pull/ only', async () => {
+    const refSpec = refHelper.getRefSpec('refs/pull/123/merge', '')
+    expect(refSpec.length).toBe(1)
+    expect(refSpec[0]).toBe('+refs/pull/123/merge:refs/remotes/pull/123/merge')
+  })
+
+  it('getRefSpec refs/tags/ only', async () => {
+    const refSpec = refHelper.getRefSpec('refs/tags/my-tag', '')
+    expect(refSpec.length).toBe(1)
+    expect(refSpec[0]).toBe('+refs/tags/my-tag:refs/tags/my-tag')
+  })
+})

__test__/retry-helper.test.ts

@@ -0,0 +1,87 @@
+import * as core from '@actions/core'
+import {RetryHelper} from '../lib/retry-helper'
+
+let info: string[]
+let retryHelper: any
+
+describe('retry-helper tests', () => {
+  beforeAll(() => {
+    // Mock @actions/core info()
+    jest.spyOn(core, 'info').mockImplementation((message: string) => {
+      info.push(message)
+    })
+
+    retryHelper = new RetryHelper(3, 0, 0)
+  })
+
+  beforeEach(() => {
+    // Reset info
+    info = []
+  })
+
+  afterAll(() => {
+    // Restore
+    jest.restoreAllMocks()
+  })
+
+  it('first attempt succeeds', async () => {
+    const actual = await retryHelper.execute(async () => {
+      return 'some result'
+    })
+    expect(actual).toBe('some result')
+    expect(info).toHaveLength(0)
+  })
+
+  it('second attempt succeeds', async () => {
+    let attempts = 0
+    const actual = await retryHelper.execute(() => {
+      if (++attempts == 1) {
+        throw new Error('some error')
+      }
+
+      return Promise.resolve('some result')
+    })
+    expect(attempts).toBe(2)
+    expect(actual).toBe('some result')
+    expect(info).toHaveLength(2)
+    expect(info[0]).toBe('some error')
+    expect(info[1]).toMatch(/Waiting .+ seconds before trying again/)
+  })
+
+  it('third attempt succeeds', async () => {
+    let attempts = 0
+    const actual = await retryHelper.execute(() => {
+      if (++attempts < 3) {
+        throw new Error(`some error ${attempts}`)
+      }
+
+      return Promise.resolve('some result')
+    })
+    expect(attempts).toBe(3)
+    expect(actual).toBe('some result')
+    expect(info).toHaveLength(4)
+    expect(info[0]).toBe('some error 1')
+    expect(info[1]).toMatch(/Waiting .+ seconds before trying again/)
+    expect(info[2]).toBe('some error 2')
+    expect(info[3]).toMatch(/Waiting .+ seconds before trying again/)
+  })
+
+  it('all attempts fail succeeds', async () => {
+    let attempts = 0
+    let error: Error = (null as unknown) as Error
+    try {
+      await retryHelper.execute(() => {
+        throw new Error(`some error ${++attempts}`)
+      })
+    } catch (err) {
+      error = err as Error
+    }
+    expect(error.message).toBe('some error 3')
+    expect(attempts).toBe(3)
+    expect(info).toHaveLength(4)
+    expect(info[0]).toBe('some error 1')
+    expect(info[1]).toMatch(/Waiting .+ seconds before trying again/)
+    expect(info[2]).toBe('some error 2')
+    expect(info[3]).toMatch(/Waiting .+ seconds before trying again/)
+  })
+})

__test__/verify-basic.sh

@@ -0,0 +1,24 @@
+#!/bin/sh
+
+if [ ! -f "./basic/basic-file.txt" ]; then
+    echo "Expected basic file does not exist"
+    exit 1
+fi
+
+if [ "$1" = "--archive" ]; then
+  # Verify no .git folder
+  if [ -d "./basic/.git" ]; then
+    echo "Did not expect ./basic/.git folder to exist"
+    exit 1
+  fi
+else
+  # Verify .git folder
+  if [ ! -d "./basic/.git" ]; then
+    echo "Expected ./basic/.git folder to exist"
+    exit 1
+  fi
+
+  # Verify auth token
+  cd basic
+  git fetch --no-tags --depth=1 origin +refs/heads/main:refs/remotes/origin/main
+fi

__test__/verify-clean.sh

@@ -0,0 +1,13 @@
+#!/bin/bash
+
+if [[ "$(git -C ./basic status --porcelain)" != "" ]]; then
+    echo ----------------------------------------
+    echo git status
+    echo ----------------------------------------
+    git status
+    echo ----------------------------------------
+    echo git diff
+    echo ----------------------------------------
+    git diff
+    exit 1
+fi

__test__/verify-lfs.sh

@@ -0,0 +1,11 @@
+#!/bin/bash
+
+if [ ! -f "./lfs/regular-file.txt" ]; then
+    echo "Expected regular file does not exist"
+    exit 1
+fi
+
+if [ ! -f "./lfs/lfs-file.bin" ]; then
+    echo "Expected lfs file does not exist"
+    exit 1
+fi

__test__/verify-no-unstaged-changes.sh

@@ -0,0 +1,17 @@
+#!/bin/bash
+
+if [[ "$(git status --porcelain)" != "" ]]; then
+    echo ----------------------------------------
+    echo git status
+    echo ----------------------------------------
+    git status
+    echo ----------------------------------------
+    echo git diff
+    echo ----------------------------------------
+    git diff
+    echo ----------------------------------------
+    echo Troubleshooting
+    echo ----------------------------------------
+    echo "::error::Unstaged changes detected. Locally try running: git clean -ffdx && npm ci && npm run format && npm run build"
+    exit 1
+fi

__test__/verify-side-by-side.sh

@@ -0,0 +1,11 @@
+#!/bin/bash
+
+if [ ! -f "./side-by-side-1/side-by-side-test-file-1.txt" ]; then
+    echo "Expected file 1 does not exist"
+    exit 1
+fi
+
+if [ ! -f "./side-by-side-2/side-by-side-test-file-2.txt" ]; then
+    echo "Expected file 2 does not exist"
+    exit 1
+fi

__test__/verify-submodules-false.sh

@@ -0,0 +1,11 @@
+#!/bin/bash
+
+if [ ! -f "./submodules-false/regular-file.txt" ]; then
+    echo "Expected regular file does not exist"
+    exit 1
+fi
+
+if [ -f "./submodules-false/submodule-level-1/submodule-file.txt" ]; then
+    echo "Unexpected submodule file exists"
+    exit 1
+fi

__test__/verify-submodules-recursive.sh

@@ -0,0 +1,26 @@
+#!/bin/bash
+
+if [ ! -f "./submodules-recursive/regular-file.txt" ]; then
+    echo "Expected regular file does not exist"
+    exit 1
+fi
+
+if [ ! -f "./submodules-recursive/submodule-level-1/submodule-file.txt" ]; then
+    echo "Expected submodule file does not exist"
+    exit 1
+fi
+
+if [ ! -f "./submodules-recursive/submodule-level-1/submodule-level-2/nested-submodule-file.txt" ]; then
+    echo "Expected nested submodule file does not exists"
+    exit 1
+fi
+
+echo "Testing persisted credential"
+pushd ./submodules-recursive/submodule-level-1/submodule-level-2
+git config --local --name-only --get-regexp http.+extraheader && git fetch
+if [ "$?" != "0" ]; then
+    echo "Failed to validate persisted credential"
+    popd
+    exit 1
+fi
+popd

__test__/verify-submodules-true.sh

@@ -0,0 +1,26 @@
+#!/bin/bash
+
+if [ ! -f "./submodules-true/regular-file.txt" ]; then
+    echo "Expected regular file does not exist"
+    exit 1
+fi
+
+if [ ! -f "./submodules-true/submodule-level-1/submodule-file.txt" ]; then
+    echo "Expected submodule file does not exist"
+    exit 1
+fi
+
+if [ -f "./submodules-true/submodule-level-1/submodule-level-2/nested-submodule-file.txt" ]; then
+    echo "Unexpected nested submodule file exists"
+    exit 1
+fi
+
+echo "Testing persisted credential"
+pushd ./submodules-true/submodule-level-1
+git config --local --name-only --get-regexp http.+extraheader && git fetch
+if [ "$?" != "0" ]; then
+    echo "Failed to validate persisted credential"
+    popd
+    exit 1
+fi
+popd