Add Ref and Commit outputs

Signed-off-by: Luca Comellini <luca.com@gmail.com>

.github/dependabot.yml

@@ -0,0 +1,20 @@
+---
+version: 2
+
+updates:
+- package-ecosystem: "npm"
+  directory: "/"
+  schedule:
+    interval: "weekly"
+  groups:
+    minor-npm-dependencies:
+      # NPM: Only group minor and patch updates (we want to carefully review major updates)
+      update-types: [minor, patch]
+- package-ecosystem: "github-actions"
+  directory: "/"
+  schedule:
+    interval: "weekly"
+  groups:
+    minor-actions-dependencies:
+      # GitHub Actions: Only group minor and patch updates (we want to carefully review major updates)
+      update-types: [minor, patch]

.github/workflows/check-dist.yml

@@ -25,7 +25,7 @@ jobs:
       - uses: actions/checkout@v3
 
       - name: Set Node.js 20.x
-        uses: actions/setup-node@v1
+        uses: actions/setup-node@v4
         with:
           node-version: 20.x
 
@@ -44,7 +44,7 @@ jobs:
           fi
 
       # If dist/ was different than expected, upload the expected version as an artifact
-      - uses: actions/upload-artifact@v2
+      - uses: actions/upload-artifact@v4
         if: ${{ failure() && steps.diff.conclusion == 'failure' }}
         with:
           name: dist

.github/workflows/codeql-analysis.yml

@@ -42,7 +42,7 @@ jobs:
       uses: actions/checkout@v3
 
     - name: Initialize CodeQL
-      uses: github/codeql-action/init@v2
+      uses: github/codeql-action/init@v3
       with:
         languages: ${{ matrix.language }}
         # If you wish to specify custom queries, you can do so here or in a config file.
@@ -55,4 +55,4 @@ jobs:
     - run: rm -rf dist # We want code scanning to analyze lib instead (individual .js files)
 
     - name: Perform CodeQL Analysis
-      uses: github/codeql-action/analyze@v2
+      uses: github/codeql-action/analyze@v3

.github/workflows/test.yml

@@ -7,11 +7,16 @@ on:
       - main
       - releases/*
 
+
+# Note that when you see patterns like "ref: test-data/v2/basic" within this workflow,
+# these refer to "test-data" branches on this actions/checkout repo.
+# (For example, test-data/v2/basic -> https://github.com/actions/checkout/tree/test-data/v2/basic)
+
 jobs:
   build:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/setup-node@v1
+      - uses: actions/setup-node@v4
         with:
           node-version: 20.x
       - uses: actions/checkout@v3
@@ -32,7 +37,7 @@ jobs:
     steps:
       # Clone this repo
       - name: Checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4.1.1
 
       # Basic checkout
       - name: Checkout basic
@@ -95,6 +100,16 @@ jobs:
       - name: Verify sparse checkout
         run: __test__/verify-sparse-checkout.sh
 
+      # Disabled sparse checkout in existing checkout
+      - name: Disabled sparse checkout
+        uses: ./
+        with:
+          path: sparse-checkout
+
+      - name: Verify disabled sparse checkout
+        shell: bash
+        run: set -x && ls -l sparse-checkout/src/git-command-manager.ts
+
       # Sparse checkout (non-cone mode)
       - name: Sparse checkout (non-cone mode)
         uses: ./
@@ -175,7 +190,7 @@ jobs:
   test-proxy:
     runs-on: ubuntu-latest
     container:
-      image: alpine/git:latest
+      image: ghcr.io/actions/test-ubuntu-git:main.20240221.114913.703z
       options: --dns 127.0.0.1
     services:
       squid-proxy:
@@ -242,7 +257,7 @@ jobs:
           path: basic
       - name: Verify basic
         run: __test__/verify-basic.sh --archive
-    
+
   test-git-container:
     runs-on: ubuntu-latest
     container: bitnami/git:latest
@@ -279,4 +294,33 @@ jobs:
       - name: Fix Checkout v3
         uses: actions/checkout@v3
         with:
-          path: v3
+          path: v3
+
+  test-output:
+    runs-on: ubuntu-latest
+    steps:
+      # Clone this repo
+      - name: Checkout
+        uses: actions/checkout@v3
+
+      # Basic checkout using git
+      - name: Checkout basic
+        id: checkout
+        uses: ./
+        with:
+          ref: test-data/v2/basic
+
+      # Verify output
+      - name: Verify output
+        run: |
+          echo "Commit: ${{ steps.checkout.outputs.commit }}"
+          echo "Ref: ${{ steps.checkout.outputs.ref }}"
+
+          if [ "${{ steps.checkout.outputs.ref }}" != "test-data/v2/basic" ]; then
+            echo "Expected ref to be test-data/v2/basic"
+            exit 1
+          fi
+
+      # needed to make checkout post cleanup succeed
+      - name: Fix Checkout
+        uses: actions/checkout@v3

.github/workflows/update-main-version.yml

@@ -19,13 +19,16 @@ jobs:
   tag:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v3
+    # Note this update workflow can also be used as a rollback tool.
+    # For that reason, it's best to pin `actions/checkout` to a known, stable version
+    # (typically, about two releases back).
+    - uses: actions/checkout@v4.1.1
       with:
         fetch-depth: 0
     - name: Git config
       run: |
-        git config user.name github-actions
-        git config user.email github-actions@github.com
+        git config user.name "github-actions[bot]"
+        git config user.email "41898282+github-actions[bot]@users.noreply.github.com"
     - name: Tag new target
       run: git tag -f ${{ github.event.inputs.major_version }} ${{ github.event.inputs.target }}
     - name: Push new tag

.github/workflows/update-test-ubuntu-git.yml

@@ -0,0 +1,59 @@
+name: Publish test-ubuntu-git Container
+
+on:
+  # Use an on demand workflow trigger.  
+  # (Forked copies of actions/checkout won't have permission to update GHCR.io/actions, 
+  #  so avoid trigger events that run automatically.)
+  workflow_dispatch:
+    inputs:
+      publish:
+        description:  'Publish to ghcr.io? (main branch only)'
+        type: boolean
+        required: true
+        default: false
+
+env:
+  REGISTRY: ghcr.io
+  IMAGE_NAME: actions/test-ubuntu-git
+
+jobs:
+  build-and-push-image:
+    runs-on: ubuntu-latest
+    # Sets the permissions granted to the `GITHUB_TOKEN` for the actions in this job.
+    permissions:
+      contents: read
+      packages: write
+ 
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      # Use `docker/login-action` to log in to GHCR.io. 
+      # Once published, the packages are scoped to the account defined here.
+      - name: Log in to the ghcr.io container registry
+        uses: docker/login-action@v3.1.0
+        with:
+          registry: ${{ env.REGISTRY }}
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Format Timestamp
+        id: timestamp
+        # Use `date` with a custom format to achieve the key=value format GITHUB_OUTPUT expects.
+        run: date -u "+now=%Y%m%d.%H%M%S.%3NZ" >> "$GITHUB_OUTPUT"
+
+      - name: Issue Image Publish Warning
+        if:  ${{ inputs.publish && github.ref_name != 'main' }}
+        run: echo "::warning::test-ubuntu-git images can only be published from the actions/checkout 'main' branch.  Workflow will continue with push/publish disabled."
+
+      # Use `docker/build-push-action` to build (and optionally publish) the image. 
+      - name: Build Docker Image (with optional Push)
+        uses: docker/build-push-action@v5.3.0
+        with:
+          context: .
+          file: images/test-ubuntu-git.Dockerfile
+          # For now, attempts to push to ghcr.io must target the `main` branch.
+          # In the future, consider also allowing attempts from `releases/*` branches.
+          push: ${{ inputs.publish && github.ref_name == 'main' }}
+          tags: |
+            ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}:${{ github.ref_name }}.${{ steps.timestamp.outputs.now }}

CHANGELOG.md

@@ -1,5 +1,23 @@
 # Changelog
 
+## v4.1.4
+- Disable `extensions.worktreeConfig` when disabling `sparse-checkout` by @jww3 in https://github.com/actions/checkout/pull/1692
+- Add dependabot config by @cory-miller in https://github.com/actions/checkout/pull/1688
+- Bump the minor-actions-dependencies group with 2 updates by @dependabot in https://github.com/actions/checkout/pull/1693
+- Bump word-wrap from 1.2.3 to 1.2.5 by @dependabot in https://github.com/actions/checkout/pull/1643
+
+## v4.1.3
+- Check git version before attempting to disable `sparse-checkout` by @jww3 in https://github.com/actions/checkout/pull/1656
+- Add SSH user parameter by @cory-miller in https://github.com/actions/checkout/pull/1685
+- Update `actions/checkout` version in `update-main-version.yml` by @jww3 in https://github.com/actions/checkout/pull/1650
+
+## v4.1.2
+- Fix: Disable sparse checkout whenever `sparse-checkout` option is not present @dscho in https://github.com/actions/checkout/pull/1598
+
+## v4.1.1
+- Correct link to GitHub Docs by @peterbe in https://github.com/actions/checkout/pull/1511
+- Link to release page from what's new section by @cory-miller in https://github.com/actions/checkout/pull/1514
+
 ## v4.1.0
 - [Add support for partial checkout filters](https://github.com/actions/checkout/pull/1396)
 

README.md

@@ -62,6 +62,11 @@ Please refer to the [release page](https://github.com/actions/checkout/releases/
     # Default: true
     ssh-strict: ''
 
+    # The user to use when connecting to the remote SSH host. By default 'git' is
+    # used.
+    # Default: git
+    ssh-user: ''
+
     # Whether to configure the token or SSH key with the local git config
     # Default: true
     persist-credentials: ''
@@ -274,8 +279,9 @@ jobs:
       - uses: actions/checkout@v4
       - run: |
           date > generated.txt
-          git config user.name github-actions
-          git config user.email github-actions@github.com
+          # Note: the following account information will not work on GHES
+          git config user.name "github-actions[bot]"
+          git config user.email "41898282+github-actions[bot]@users.noreply.github.com"
           git add .
           git commit -m "generated"
           git push

__test__/git-auth-helper.test.ts

@@ -169,8 +169,9 @@ describe('git-auth-helper tests', () => {
 
     // Mock fs.promises.readFile
     const realReadFile = fs.promises.readFile
-    jest.spyOn(fs.promises, 'readFile').mockImplementation(
-      async (file: any, options: any): Promise<Buffer> => {
+    jest
+      .spyOn(fs.promises, 'readFile')
+      .mockImplementation(async (file: any, options: any): Promise<Buffer> => {
         const userKnownHostsPath = path.join(
           os.homedir(),
           '.ssh',
@@ -181,8 +182,7 @@ describe('git-auth-helper tests', () => {
         }
 
         return await realReadFile(file, options)
-      }
-    )
+      })
 
     // Act
     const authHelper = gitAuthHelper.createAuthHelper(git, settings)
@@ -727,6 +727,7 @@ async function setup(testName: string): Promise<void> {
     branchDelete: jest.fn(),
     branchExists: jest.fn(),
     branchList: jest.fn(),
+    disableSparseCheckout: jest.fn(),
     sparseCheckout: jest.fn(),
     sparseCheckoutNonConeMode: jest.fn(),
     checkout: jest.fn(),
@@ -795,7 +796,8 @@ async function setup(testName: string): Promise<void> {
     ),
     tryDisableAutomaticGarbageCollection: jest.fn(),
     tryGetFetchUrl: jest.fn(),
-    tryReset: jest.fn()
+    tryReset: jest.fn(),
+    version: jest.fn()
   }
 
   settings = {
@@ -819,6 +821,7 @@ async function setup(testName: string): Promise<void> {
     sshKey: sshPath ? 'some ssh private key' : '',
     sshKnownHosts: '',
     sshStrict: true,
+    sshUser: '',
     workflowOrganizationId: 123456,
     setSafeDirectory: true,
     githubServerUrl: githubServerUrl

__test__/git-directory-helper.test.ts

@@ -462,6 +462,7 @@ async function setup(testName: string): Promise<void> {
     branchList: jest.fn(async () => {
       return []
     }),
+    disableSparseCheckout: jest.fn(),
     sparseCheckout: jest.fn(),
     sparseCheckoutNonConeMode: jest.fn(),
     checkout: jest.fn(),
@@ -500,6 +501,7 @@ async function setup(testName: string): Promise<void> {
     }),
     tryReset: jest.fn(async () => {
       return true
-    })
+    }),
+    version: jest.fn()
   }
 }

__test__/git-version.test.ts

@@ -1,4 +1,5 @@
-import {GitVersion} from '../lib/git-version'
+import {GitVersion} from '../src/git-version'
+import {MinimumGitSparseCheckoutVersion} from '../src/git-command-manager'
 
 describe('git-version tests', () => {
   it('basics', async () => {
@@ -42,4 +43,44 @@ describe('git-version tests', () => {
     expect(version.checkMinimum(new GitVersion('5.1'))).toBeFalsy()
     expect(version.checkMinimum(new GitVersion('5.1.2'))).toBeFalsy()
   })
+
+  it('sparse checkout', async () => {
+    const minSparseVer = MinimumGitSparseCheckoutVersion
+    expect(new GitVersion('1.0').checkMinimum(minSparseVer)).toBeFalsy()
+    expect(new GitVersion('1.99').checkMinimum(minSparseVer)).toBeFalsy()
+    expect(new GitVersion('2.0').checkMinimum(minSparseVer)).toBeFalsy()
+    expect(new GitVersion('2.24').checkMinimum(minSparseVer)).toBeFalsy()
+    expect(new GitVersion('2.24.0').checkMinimum(minSparseVer)).toBeFalsy()
+    expect(new GitVersion('2.24.9').checkMinimum(minSparseVer)).toBeFalsy()
+    expect(new GitVersion('2.25').checkMinimum(minSparseVer)).toBeFalsy()
+    expect(new GitVersion('2.25.0').checkMinimum(minSparseVer)).toBeFalsy()
+    expect(new GitVersion('2.25.1').checkMinimum(minSparseVer)).toBeFalsy()
+    expect(new GitVersion('2.25.9').checkMinimum(minSparseVer)).toBeFalsy()
+    expect(new GitVersion('2.26').checkMinimum(minSparseVer)).toBeFalsy()
+    expect(new GitVersion('2.26.0').checkMinimum(minSparseVer)).toBeFalsy()
+    expect(new GitVersion('2.26.1').checkMinimum(minSparseVer)).toBeFalsy()
+    expect(new GitVersion('2.26.9').checkMinimum(minSparseVer)).toBeFalsy()
+    expect(new GitVersion('2.27').checkMinimum(minSparseVer)).toBeFalsy()
+    expect(new GitVersion('2.27.0').checkMinimum(minSparseVer)).toBeFalsy()
+    expect(new GitVersion('2.27.1').checkMinimum(minSparseVer)).toBeFalsy()
+    expect(new GitVersion('2.27.9').checkMinimum(minSparseVer)).toBeFalsy()
+    //                             /---------------------------------------
+    //         ^^^ before         /         after vvv
+    // --------------------------/
+    expect(new GitVersion('2.28').checkMinimum(minSparseVer)).toBeTruthy()
+    expect(new GitVersion('2.28.0').checkMinimum(minSparseVer)).toBeTruthy()
+    expect(new GitVersion('2.28.1').checkMinimum(minSparseVer)).toBeTruthy()
+    expect(new GitVersion('2.28.9').checkMinimum(minSparseVer)).toBeTruthy()
+    expect(new GitVersion('2.29').checkMinimum(minSparseVer)).toBeTruthy()
+    expect(new GitVersion('2.29.0').checkMinimum(minSparseVer)).toBeTruthy()
+    expect(new GitVersion('2.29.1').checkMinimum(minSparseVer)).toBeTruthy()
+    expect(new GitVersion('2.29.9').checkMinimum(minSparseVer)).toBeTruthy()
+    expect(new GitVersion('2.99').checkMinimum(minSparseVer)).toBeTruthy()
+    expect(new GitVersion('3.0').checkMinimum(minSparseVer)).toBeTruthy()
+    expect(new GitVersion('3.99').checkMinimum(minSparseVer)).toBeTruthy()
+    expect(new GitVersion('4.0').checkMinimum(minSparseVer)).toBeTruthy()
+    expect(new GitVersion('4.99').checkMinimum(minSparseVer)).toBeTruthy()
+    expect(new GitVersion('5.0').checkMinimum(minSparseVer)).toBeTruthy()
+    expect(new GitVersion('5.99').checkMinimum(minSparseVer)).toBeTruthy()
+  })
 })

__test__/ref-helper.test.ts

@@ -7,11 +7,11 @@ let git: IGitCommandManager
 
 describe('ref-helper tests', () => {
   beforeEach(() => {
-    git = ({} as unknown) as IGitCommandManager
+    git = {} as unknown as IGitCommandManager
   })
 
   it('getCheckoutInfo requires git', async () => {
-    const git = (null as unknown) as IGitCommandManager
+    const git = null as unknown as IGitCommandManager
     try {
       await refHelper.getCheckoutInfo(git, 'refs/heads/my/branch', commit)
       throw new Error('Should not reach here')

__test__/retry-helper.test.ts

@@ -68,7 +68,7 @@ describe('retry-helper tests', () => {
 
   it('all attempts fail succeeds', async () => {
     let attempts = 0
-    let error: Error = (null as unknown) as Error
+    let error: Error = null as unknown as Error
     try {
       await retryHelper.execute(() => {
         throw new Error(`some error ${++attempts}`)

__test__/verify-basic.sh

@@ -18,6 +18,20 @@ else
     exit 1
   fi
 
+  # Verify that sparse-checkout is disabled.
+  SPARSE_CHECKOUT_ENABLED=$(git -C ./basic config --local --get-all core.sparseCheckout)
+  if [ "$SPARSE_CHECKOUT_ENABLED" != "" ]; then
+    echo "Expected sparse-checkout to be disabled (discovered: $SPARSE_CHECKOUT_ENABLED)"
+    exit 1
+  fi
+
+  # Verify git configuration shows worktreeConfig is effectively disabled
+  WORKTREE_CONFIG_ENABLED=$(git -C ./basic config --local --get-all extensions.worktreeConfig)
+  if [[ "$WORKTREE_CONFIG_ENABLED" != "" ]]; then
+    echo "Expected extensions.worktreeConfig (boolean) to be disabled in git config.  This could be an artifact of sparse checkout functionality."
+    exit 1
+  fi
+
   # Verify auth token
   cd basic
   git fetch --no-tags --depth=1 origin +refs/heads/main:refs/remotes/origin/main

action.yml

@@ -45,6 +45,10 @@ inputs:
       and `CheckHostIP=no` to the SSH command line. Use the input `ssh-known-hosts` to
       configure additional hosts.
     default: true
+  ssh-user:
+    description: >
+      The user to use when connecting to the remote SSH host. By default 'git' is used.
+    default: git
   persist-credentials:
     description: 'Whether to configure the token or SSH key with the local git config'
     default: true
@@ -94,6 +98,11 @@ inputs:
   github-server-url:
     description: The base URL for the GitHub instance that you are trying to clone from, will use environment defaults to fetch from the same instance that the workflow is running from unless specified. Example URLs are https://github.com or https://my-ghes-server.example.com
     required: false
+outputs:
+  ref:
+    description: 'The branch, tag or SHA that was checked out'
+  commit:
+    description: 'The commit SHA that was checked out'
 runs:
   using: node20
   main: dist/index.js

images/test-ubuntu-git.Dockerfile

@@ -0,0 +1,12 @@
+# Defines the test-ubuntu-git Container Image.
+# Consumed by actions/checkout CI/CD validation workflows.
+
+FROM ubuntu:latest
+
+RUN apt update
+RUN apt install -y git
+
+LABEL org.opencontainers.image.title="Ubuntu + git (validation image)"
+LABEL org.opencontainers.image.description="Ubuntu image with git pre-installed. Intended primarily for testing `actions/checkout` during CI/CD workflows."
+LABEL org.opencontainers.image.documentation="https://github.com/actions/checkout/tree/main/images/test-ubuntu-git.md"
+LABEL org.opencontainers.image.licenses=MIT

images/test-ubuntu-git.md

@@ -0,0 +1,15 @@
+# `test-ubuntu-git` Container Image
+
+[![Publish test-ubuntu-git Container](https://github.com/actions/checkout/actions/workflows/update-test-ubuntu-git.yml/badge.svg)](https://github.com/actions/checkout/actions/workflows/update-test-ubuntu-git.yml)
+
+## Purpose
+
+`test-ubuntu-git` is a container image hosted on the GitHub Container Registry, `ghcr.io`.  
+
+It is intended primarily for testing the [`actions/checkout` repository](https://github.com/actions/checkout) as part of `actions/checkout`'s CI/CD workflows.
+
+The composition of `test-ubuntu-git` is intentionally minimal.  It is comprised of [git](https://git-scm.com/) installed on top of a [base-level ubuntu image](https://hub.docker.com/_/ubuntu/tags).
+
+# License
+
+`test-ubuntu-git` is released under the [MIT License](/LICENSE).

jest.config.js

@@ -1,5 +1,6 @@
 module.exports = {
   clearMocks: true,
+  fakeTimers: {},
   moduleFileExtensions: ['js', 'ts'],
   testEnvironment: 'node',
   testMatch: ['**/*.test.ts'],

package.json

@@ -1,6 +1,6 @@
 {
   "name": "checkout",
-  "version": "4.1.0",
+  "version": "4.1.4",
   "description": "checkout action",
   "main": "lib/main.js",
   "scripts": {
@@ -28,28 +28,28 @@
   },
   "homepage": "https://github.com/actions/checkout#readme",
   "dependencies": {
-    "@actions/core": "^1.10.0",
-    "@actions/exec": "^1.0.1",
-    "@actions/github": "^5.0.0",
+    "@actions/core": "^1.10.1",
+    "@actions/exec": "^1.1.1",
+    "@actions/github": "^6.0.0",
     "@actions/io": "^1.1.3",
-    "@actions/tool-cache": "^1.1.2",
-    "uuid": "^3.3.3"
+    "@actions/tool-cache": "^2.0.1",
+    "uuid": "^9.0.1"
   },
   "devDependencies": {
-    "@types/jest": "^27.0.2",
-    "@types/node": "^20.5.3",
-    "@types/uuid": "^3.4.6",
-    "@typescript-eslint/eslint-plugin": "^5.45.0",
-    "@typescript-eslint/parser": "^5.45.0",
-    "@vercel/ncc": "^0.36.1",
-    "eslint": "^7.32.0",
-    "eslint-plugin-github": "^4.3.2",
-    "eslint-plugin-jest": "^25.7.0",
-    "jest": "^27.3.0",
-    "jest-circus": "^27.3.0",
-    "js-yaml": "^3.13.1",
-    "prettier": "^1.19.1",
-    "ts-jest": "^27.0.7",
-    "typescript": "^4.4.4"
+    "@types/jest": "^29.5.12",
+    "@types/node": "^20.12.7",
+    "@types/uuid": "^9.0.8",
+    "@typescript-eslint/eslint-plugin": "^7.7.1",
+    "@typescript-eslint/parser": "^7.7.1",
+    "@vercel/ncc": "^0.38.1",
+    "eslint": "^8.57.0",
+    "eslint-plugin-github": "^4.10.2",
+    "eslint-plugin-jest": "^28.2.0",
+    "jest": "^29.7.0",
+    "jest-circus": "^29.7.0",
+    "js-yaml": "^4.1.0",
+    "prettier": "^3.2.5",
+    "ts-jest": "^29.1.2",
+    "typescript": "^5.4.5"
   }
-}
+}

src/fs-helper.ts

@@ -18,8 +18,9 @@ export function directoryExistsSync(path: string, required?: boolean): boolean {
     }
 
     throw new Error(
-      `Encountered an error when checking whether path '${path}' exists: ${(error as any)
-        ?.message ?? error}`
+      `Encountered an error when checking whether path '${path}' exists: ${
+        (error as any)?.message ?? error
+      }`
     )
   }
 
@@ -45,8 +46,9 @@ export function existsSync(path: string): boolean {
     }
 
     throw new Error(
-      `Encountered an error when checking whether path '${path}' exists: ${(error as any)
-        ?.message ?? error}`
+      `Encountered an error when checking whether path '${path}' exists: ${
+        (error as any)?.message ?? error
+      }`
     )
   }
 
@@ -67,8 +69,9 @@ export function fileExistsSync(path: string): boolean {
     }
 
     throw new Error(
-      `Encountered an error when checking whether path '${path}' exists: ${(error as any)
-        ?.message ?? error}`
+      `Encountered an error when checking whether path '${path}' exists: ${
+        (error as any)?.message ?? error
+      }`
     )
   }
 

src/git-auth-helper.ts

@@ -8,7 +8,7 @@ import * as path from 'path'
 import * as regexpHelper from './regexp-helper'
 import * as stateHelper from './state-helper'
 import * as urlHelper from './url-helper'
-import {default as uuid} from 'uuid/v4'
+import {v4 as uuid} from 'uuid'
 import {IGitCommandManager} from './git-command-manager'
 import {IGitSourceSettings} from './git-source-settings'
 
@@ -49,7 +49,7 @@ class GitAuthHelper {
     gitSourceSettings: IGitSourceSettings | undefined
   ) {
     this.git = gitCommandManager
-    this.settings = gitSourceSettings || (({} as unknown) as IGitSourceSettings)
+    this.settings = gitSourceSettings || ({} as unknown as IGitSourceSettings)
 
     // Token auth header
     const serverUrl = urlHelper.getServerUrl(this.settings.githubServerUrl)

src/git-command-manager.ts

@@ -11,12 +11,15 @@ import {GitVersion} from './git-version'
 
 // Auth header not supported before 2.9
 // Wire protocol v2 not supported before 2.18
+// sparse-checkout not [well-]supported before 2.28 (see https://github.com/actions/checkout/issues/1386)
 export const MinimumGitVersion = new GitVersion('2.18')
+export const MinimumGitSparseCheckoutVersion = new GitVersion('2.28')
 
 export interface IGitCommandManager {
   branchDelete(remote: boolean, branch: string): Promise<void>
   branchExists(remote: boolean, pattern: string): Promise<boolean>
   branchList(remote: boolean): Promise<string[]>
+  disableSparseCheckout(): Promise<void>
   sparseCheckout(sparseCheckout: string[]): Promise<void>
   sparseCheckoutNonConeMode(sparseCheckout: string[]): Promise<void>
   checkout(ref: string, startPoint: string): Promise<void>
@@ -59,6 +62,7 @@ export interface IGitCommandManager {
   tryDisableAutomaticGarbageCollection(): Promise<boolean>
   tryGetFetchUrl(): Promise<string>
   tryReset(): Promise<boolean>
+  version(): Promise<GitVersion>
 }
 
 export async function createCommandManager(
@@ -82,6 +86,7 @@ class GitCommandManager {
   private lfs = false
   private doSparseCheckout = false
   private workingDirectory = ''
+  private gitVersion: GitVersion = new GitVersion()
 
   // Private constructor; use createCommandManager()
   private constructor() {}
@@ -171,6 +176,12 @@ class GitCommandManager {
     return result
   }
 
+  async disableSparseCheckout(): Promise<void> {
+    await this.execGit(['sparse-checkout', 'disable'])
+    // Disabling 'sparse-checkout` leaves behind an undesirable side-effect in config (even in a pristine environment).
+    await this.tryConfigUnset('extensions.worktreeConfig', false)
+  }
+
   async sparseCheckout(sparseCheckout: string[]): Promise<void> {
     await this.execGit(['sparse-checkout', 'set', ...sparseCheckout])
   }
@@ -475,6 +486,10 @@ class GitCommandManager {
     return output.exitCode === 0
   }
 
+  async version(): Promise<GitVersion> {
+    return this.gitVersion
+  }
+
   static async createCommandManager(
     workingDirectory: string,
     lfs: boolean,
@@ -551,23 +566,23 @@ class GitCommandManager {
 
     // Git version
     core.debug('Getting git version')
-    let gitVersion = new GitVersion()
+    this.gitVersion = new GitVersion()
     let gitOutput = await this.execGit(['version'])
     let stdout = gitOutput.stdout.trim()
     if (!stdout.includes('\n')) {
       const match = stdout.match(/\d+\.\d+(\.\d+)?/)
       if (match) {
-        gitVersion = new GitVersion(match[0])
+        this.gitVersion = new GitVersion(match[0])
       }
     }
-    if (!gitVersion.isValid()) {
+    if (!this.gitVersion.isValid()) {
       throw new Error('Unable to determine git version')
     }
 
     // Minimum git version
-    if (!gitVersion.checkMinimum(MinimumGitVersion)) {
+    if (!this.gitVersion.checkMinimum(MinimumGitVersion)) {
       throw new Error(
-        `Minimum required git version is ${MinimumGitVersion}. Your git ('${this.gitPath}') is ${gitVersion}`
+        `Minimum required git version is ${MinimumGitVersion}. Your git ('${this.gitPath}') is ${this.gitVersion}`
       )
     }
 
@@ -601,16 +616,14 @@ class GitCommandManager {
 
     this.doSparseCheckout = doSparseCheckout
     if (this.doSparseCheckout) {
-      // The `git sparse-checkout` command was introduced in Git v2.25.0
-      const minimumGitSparseCheckoutVersion = new GitVersion('2.25')
-      if (!gitVersion.checkMinimum(minimumGitSparseCheckoutVersion)) {
+      if (!this.gitVersion.checkMinimum(MinimumGitSparseCheckoutVersion)) {
         throw new Error(
-          `Minimum Git version required for sparse checkout is ${minimumGitSparseCheckoutVersion}. Your git ('${this.gitPath}') is ${gitVersion}`
+          `Minimum Git version required for sparse checkout is ${MinimumGitSparseCheckoutVersion}. Your git ('${this.gitPath}') is ${this.gitVersion}`
         )
       }
     }
     // Set the user agent
-    const gitHttpUserAgent = `git/${gitVersion} (github-actions-checkout)`
+    const gitHttpUserAgent = `git/${this.gitVersion} (github-actions-checkout)`
     core.debug(`Set git useragent to: ${gitHttpUserAgent}`)
     this.gitEnv['GIT_HTTP_USER_AGENT'] = gitHttpUserAgent
   }

src/git-source-provider.ts

@@ -9,7 +9,10 @@ import * as path from 'path'
 import * as refHelper from './ref-helper'
 import * as stateHelper from './state-helper'
 import * as urlHelper from './url-helper'
-import {IGitCommandManager} from './git-command-manager'
+import {
+  MinimumGitSparseCheckoutVersion,
+  IGitCommandManager
+} from './git-command-manager'
 import {IGitSourceSettings} from './git-source-settings'
 
 export async function getSource(settings: IGitSourceSettings): Promise<void> {
@@ -208,7 +211,13 @@ export async function getSource(settings: IGitSourceSettings): Promise<void> {
     }
 
     // Sparse checkout
-    if (settings.sparseCheckout) {
+    if (!settings.sparseCheckout) {
+      let gitVersion = await git.version()
+      // no need to disable sparse-checkout if the installed git runtime doesn't even support it.
+      if (gitVersion.checkMinimum(MinimumGitSparseCheckoutVersion)) {
+        await git.disableSparseCheckout()
+      }
+    } else {
       core.startGroup('Setting up sparse checkout')
       if (settings.sparseCheckoutConeMode) {
         await git.sparseCheckout(settings.sparseCheckout)
@@ -252,7 +261,8 @@ export async function getSource(settings: IGitSourceSettings): Promise<void> {
     const commitInfo = await git.log1()
 
     // Log commit sha
-    await git.log1("--format='%H'")
+    const commitSHA = await git.log1('--format=%H')
+    core.setOutput('commit', commitSHA.trim())
 
     // Check for incorrect pull request merge commit
     await refHelper.checkCommitInfo(

src/git-source-settings.ts

@@ -94,6 +94,11 @@ export interface IGitSourceSettings {
    */
   sshStrict: boolean
 
+  /**
+   * The SSH user to login as
+   */
+  sshUser: string
+
   /**
    * Indicates whether to persist the credentials on disk to enable scripting authenticated git commands
    */

src/github-api-helper.ts

@@ -6,7 +6,7 @@ import * as io from '@actions/io'
 import * as path from 'path'
 import * as retryHelper from './retry-helper'
 import * as toolCache from '@actions/tool-cache'
-import {default as uuid} from 'uuid/v4'
+import {v4 as uuid} from 'uuid'
 import {getServerApiUrl} from './url-helper'
 
 const IS_WINDOWS = process.platform === 'win32'

src/input-helper.ts

@@ -6,7 +6,7 @@ import * as workflowContextHelper from './workflow-context-helper'
 import {IGitSourceSettings} from './git-source-settings'
 
 export async function getInputs(): Promise<IGitSourceSettings> {
-  const result = ({} as unknown) as IGitSourceSettings
+  const result = {} as unknown as IGitSourceSettings
 
   // GitHub workspace
   let githubWorkspacePath = process.env['GITHUB_WORKSPACE']
@@ -143,13 +143,15 @@ export async function getInputs(): Promise<IGitSourceSettings> {
   result.sshKnownHosts = core.getInput('ssh-known-hosts')
   result.sshStrict =
     (core.getInput('ssh-strict') || 'true').toUpperCase() === 'TRUE'
+  result.sshUser = core.getInput('ssh-user')
 
   // Persist credentials
   result.persistCredentials =
     (core.getInput('persist-credentials') || 'false').toUpperCase() === 'TRUE'
 
   // Workflow organization ID
-  result.workflowOrganizationId = await workflowContextHelper.getOrganizationId()
+  result.workflowOrganizationId =
+    await workflowContextHelper.getOrganizationId()
 
   // Set safe.directory in git global config.
   result.setSafeDirectory =

src/main.ts

@@ -19,6 +19,7 @@ async function run(): Promise<void> {
 
       // Get sources
       await gitSourceProvider.getSource(sourceSettings)
+      core.setOutput('ref', sourceSettings.ref)
     } finally {
       // Unregister problem matcher
       coreCommand.issueCommand('remove-matcher', {owner: 'checkout-git'}, '')

src/misc/generate-docs.ts

@@ -20,7 +20,7 @@ function updateUsage(
   }
 
   // Load the action.yml
-  const actionYaml = yaml.safeLoad(fs.readFileSync(actionYamlPath).toString())
+  const actionYaml = yaml.load(fs.readFileSync(actionYamlPath).toString())
 
   // Load the README
   const originalReadme = fs.readFileSync(readmePath).toString()

src/ref-helper.ts

@@ -23,7 +23,7 @@ export async function getCheckoutInfo(
     throw new Error('Args ref and commit cannot both be empty')
   }
 
-  const result = ({} as unknown) as ICheckoutInfo
+  const result = {} as unknown as ICheckoutInfo
   const upperRef = (ref || '').toUpperCase()
 
   // SHA only

src/url-helper.ts

@@ -12,7 +12,8 @@ export function getFetchUrl(settings: IGitSourceSettings): string {
   const encodedOwner = encodeURIComponent(settings.repositoryOwner)
   const encodedName = encodeURIComponent(settings.repositoryName)
   if (settings.sshKey) {
-    return `git@${serviceUrl.hostname}:${encodedOwner}/${encodedName}.git`
+    const user = settings.sshUser.length > 0 ? settings.sshUser : 'git'
+    return `${user}@${serviceUrl.hostname}:${encodedOwner}/${encodedName}.git`
   }
 
   // "origin" is SCHEME://HOSTNAME[:PORT]

src/workflow-context-helper.ts

@@ -23,8 +23,9 @@ export async function getOrganizationId(): Promise<number | undefined> {
     return id as number
   } catch (err) {
     core.debug(
-      `Unable to load organization ID from GITHUB_EVENT_PATH: ${(err as any)
-        .message || err}`
+      `Unable to load organization ID from GITHUB_EVENT_PATH: ${
+        (err as any).message || err
+      }`
     )
   }
 }