Release v3.5.3 (#1376)

* Add support for sparse checkouts

* sparse-checkout: optionally turn off cone mode

While it _is_ true that cone mode is the default nowadays (mainly for
performance reasons: code mode is much faster than non-cone mode), there
_are_ legitimate use cases where non-cone mode is really useful.

Let's add a flag to optionally disable cone mode.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>

* Verify minimum Git version for sparse checkout

The `git sparse-checkout` command is available only since Git version
v2.25.0. The `actions/checkout` Action actually supports older Git
versions than that; As of time of writing, the minimum version is
v2.18.0.

Instead of raising this minimum version even for users who do not
require a sparse checkout, only check for this minimum version
specifically when a sparse checkout was asked for.

Suggested-by: Tingluo Huang <tingluohuang@github.com>
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>

* Support sparse checkout/LFS better

Instead of fetching all the LFS objects present in the current revision
in a sparse checkout, whether they are needed inside the sparse cone or
not, let's instead only pull the ones that are actually needed.

To do that, let's avoid running that preemptive `git lfs fetch` call in
case of a sparse checkout.

An alternative that was considered during the development of this patch
(and ultimately rejected) was to use `git lfs pull --include <path>...`,
but it turned out to be too inflexible because it requires exact paths,
not the patterns that are available via the sparse checkout definition,
and that risks running into command-line length limitations.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>

---------

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Co-authored-by: Daniel <daniel.fernandez@feverup.com>

.github/workflows/test.yml

@@ -72,6 +72,33 @@ jobs:
         shell: bash
         run: __test__/verify-side-by-side.sh
 
+      # Sparse checkout
+      - name: Sparse checkout
+        uses: ./
+        with:
+          sparse-checkout: |
+            __test__
+            .github
+            dist
+          path: sparse-checkout
+
+      - name: Verify sparse checkout
+        run: __test__/verify-sparse-checkout.sh
+
+      # Sparse checkout (non-cone mode)
+      - name: Sparse checkout (non-cone mode)
+        uses: ./
+        with:
+          sparse-checkout: |
+            /__test__/
+            /.github/
+            /dist/
+          sparse-checkout-cone-mode: false
+          path: sparse-checkout-non-cone-mode
+
+      - name: Verify sparse checkout (non-cone mode)
+        run: __test__/verify-sparse-checkout-non-cone-mode.sh
+
       # LFS
       - name: Checkout LFS
         uses: ./

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

@@ -1,5 +1,5 @@
 name: Update Main Version
-run-name: Move ${{ github.event.inputs.main_version }} to ${{ github.event.inputs.target }}
+run-name: Move ${{ github.event.inputs.major_version }} to ${{ github.event.inputs.target }}
 
 on:
   workflow_dispatch:
@@ -7,11 +7,12 @@ on:
       target:
         description: The tag or reference to use
         required: true
-      main_version:
+      major_version:
         type: choice
-        description: The main version to update
+        description: The major version to update
         options:
           - v3
+          - v2
 
 jobs:
   tag:
@@ -25,6 +26,6 @@ jobs:
         git config user.name github-actions
         git config user.email github-actions@github.com
     - name: Tag new target
-      run: git tag -f ${{ github.event.inputs.main_version }} ${{ github.event.inputs.target }}
+      run: git tag -f ${{ github.event.inputs.major_version }} ${{ github.event.inputs.target }}
     - name: Push new tag
-      run: git push origin ${{ github.event.inputs.main_version }} --force
+      run: git push origin ${{ github.event.inputs.major_version }} --force

CHANGELOG.md

@@ -1,5 +1,19 @@
 # Changelog
 
+## v3.5.3
+- [Fix: Checkout fail in self-hosted runners when faulty submodule are checked-in](https://github.com/actions/checkout/pull/1196)
+- [Fix typos found by codespell](https://github.com/actions/checkout/pull/1287)
+- [Add support for sparse checkouts](https://github.com/actions/checkout/pull/1369)
+
+## v3.5.2
+- [Fix api endpoint for GHES](https://github.com/actions/checkout/pull/1289)
+
+## v3.5.1
+- [Fix slow checkout on Windows](https://github.com/actions/checkout/pull/1246)
+
+## v3.5.0
+* [Add new public key for known_hosts](https://github.com/actions/checkout/pull/1237)
+
 ## v3.4.0
 - [Upgrade codeql actions to v2](https://github.com/actions/checkout/pull/1209)
 - [Upgrade dependencies](https://github.com/actions/checkout/pull/1210)

README.md

@@ -74,6 +74,15 @@ When Git 2.18 or higher is not in your PATH, falls back to the REST API to downl
     # Default: true
     clean: ''
 
+    # Do a sparse checkout on given patterns. Each pattern should be separated with
+    # new lines
+    # Default: null
+    sparse-checkout: ''
+
+    # Specifies whether to use cone-mode when doing a sparse checkout.
+    # Default: true
+    sparse-checkout-cone-mode: ''
+
     # Number of commits to fetch. 0 indicates all history for all branches and tags.
     # Default: 1
     fetch-depth: ''
@@ -106,6 +115,9 @@ When Git 2.18 or higher is not in your PATH, falls back to the REST API to downl
 
 # Scenarios
 
+- [Fetch only the root files](#Fetch-only-the-root-files)
+- [Fetch only the root files and `.github` and `src` folder](#Fetch-only-the-root-files-and-github-and-src-folder)
+- [Fetch only a single file](#Fetch-only-a-single-file)
 - [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)
@@ -116,6 +128,34 @@ When Git 2.18 or higher is not in your PATH, falls back to the REST API to downl
 - [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 only the root files
+
+```yaml
+- uses: actions/checkout@v3
+  with:
+    sparse-checkout: .
+```
+
+## Fetch only the root files and `.github` and `src` folder
+
+```yaml
+- uses: actions/checkout@v3
+  with:
+    sparse-checkout: |
+      .github
+      src
+```
+
+## Fetch only a single file
+
+```yaml
+- uses: actions/checkout@v3
+  with:
+    sparse-checkout: |
+      README.md
+    sparse-checkout-cone-mode: false
+```
+
 ## Fetch all history for all tags and branches
 
 ```yaml

__test__/git-auth-helper.test.ts

@@ -727,6 +727,8 @@ async function setup(testName: string): Promise<void> {
     branchDelete: jest.fn(),
     branchExists: jest.fn(),
     branchList: jest.fn(),
+    sparseCheckout: jest.fn(),
+    sparseCheckoutNonConeMode: jest.fn(),
     checkout: jest.fn(),
     checkoutDetach: jest.fn(),
     config: jest.fn(
@@ -770,6 +772,9 @@ async function setup(testName: string): Promise<void> {
       return ''
     }),
     submoduleSync: jest.fn(),
+    submoduleStatus: jest.fn(async () => {
+      return true
+    }),
     submoduleUpdate: jest.fn(),
     tagExists: jest.fn(),
     tryClean: jest.fn(),
@@ -797,6 +802,8 @@ async function setup(testName: string): Promise<void> {
     authToken: 'some auth token',
     clean: true,
     commit: '',
+    sparseCheckout: [],
+    sparseCheckoutConeMode: true,
     fetchDepth: 1,
     lfs: false,
     submodules: false,

__test__/git-command-manager.test.ts

@@ -39,7 +39,12 @@ describe('git-auth-helper tests', () => {
     jest.spyOn(exec, 'exec').mockImplementation(mockExec)
     const workingDirectory = 'test'
     const lfs = false
-    git = await commandManager.createCommandManager(workingDirectory, lfs)
+    const doSparseCheckout = false
+    git = await commandManager.createCommandManager(
+      workingDirectory,
+      lfs,
+      doSparseCheckout
+    )
 
     let branches = await git.branchList(false)
 
@@ -70,7 +75,12 @@ describe('git-auth-helper tests', () => {
     jest.spyOn(exec, 'exec').mockImplementation(mockExec)
     const workingDirectory = 'test'
     const lfs = false
-    git = await commandManager.createCommandManager(workingDirectory, lfs)
+    const doSparseCheckout = false
+    git = await commandManager.createCommandManager(
+      workingDirectory,
+      lfs,
+      doSparseCheckout
+    )
 
     let branches = await git.branchList(false)
 

__test__/git-directory-helper.test.ts

@@ -281,6 +281,65 @@ describe('git-directory-helper tests', () => {
     expect(git.branchDelete).toHaveBeenCalledWith(false, 'local-branch-2')
   })
 
+  const cleanWhenSubmoduleStatusIsFalse =
+    'cleans when submodule status is false'
+
+  it(cleanWhenSubmoduleStatusIsFalse, async () => {
+    // Arrange
+    await setup(cleanWhenSubmoduleStatusIsFalse)
+    await fs.promises.writeFile(path.join(repositoryPath, 'my-file'), '')
+
+    //mock bad submodule
+
+    const submoduleStatus = git.submoduleStatus as jest.Mock<any, any>
+    submoduleStatus.mockImplementation(async (remote: boolean) => {
+      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()
+  })
+
+  const doesNotCleanWhenSubmoduleStatusIsTrue =
+    'does not clean when submodule status is true'
+
+  it(doesNotCleanWhenSubmoduleStatusIsTrue, async () => {
+    // Arrange
+    await setup(doesNotCleanWhenSubmoduleStatusIsTrue)
+    await fs.promises.writeFile(path.join(repositoryPath, 'my-file'), '')
+
+    const submoduleStatus = git.submoduleStatus as jest.Mock<any, any>
+    submoduleStatus.mockImplementation(async (remote: boolean) => {
+      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.tryClean).toHaveBeenCalled()
+  })
+
   const removesLockFiles = 'removes lock files'
   it(removesLockFiles, async () => {
     // Arrange
@@ -403,6 +462,8 @@ async function setup(testName: string): Promise<void> {
     branchList: jest.fn(async () => {
       return []
     }),
+    sparseCheckout: jest.fn(),
+    sparseCheckoutNonConeMode: jest.fn(),
     checkout: jest.fn(),
     checkoutDetach: jest.fn(),
     config: jest.fn(),
@@ -423,6 +484,9 @@ async function setup(testName: string): Promise<void> {
     submoduleForeach: jest.fn(),
     submoduleSync: jest.fn(),
     submoduleUpdate: jest.fn(),
+    submoduleStatus: jest.fn(async () => {
+      return true
+    }),
     tagExists: jest.fn(),
     tryClean: jest.fn(async () => {
       return true

__test__/input-helper.test.ts

@@ -79,6 +79,8 @@ describe('input-helper tests', () => {
     expect(settings.clean).toBe(true)
     expect(settings.commit).toBeTruthy()
     expect(settings.commit).toBe('1234567890123456789012345678901234567890')
+    expect(settings.sparseCheckout).toBe(undefined)
+    expect(settings.sparseCheckoutConeMode).toBe(true)
     expect(settings.fetchDepth).toBe(1)
     expect(settings.lfs).toBe(false)
     expect(settings.ref).toBe('refs/heads/some-ref')

__test__/verify-sparse-checkout-non-cone-mode.sh

@@ -0,0 +1,51 @@
+#!/bin/sh
+
+# Verify .git folder
+if [ ! -d "./sparse-checkout-non-cone-mode/.git" ]; then
+  echo "Expected ./sparse-checkout-non-cone-mode/.git folder to exist"
+  exit 1
+fi
+
+# Verify sparse-checkout (non-cone-mode)
+cd sparse-checkout-non-cone-mode
+
+ENABLED=$(git config --local --get-all core.sparseCheckout)
+
+if [ "$?" != "0" ]; then
+    echo "Failed to verify that sparse-checkout is enabled"
+    exit 1
+fi
+
+# Check that sparse-checkout is enabled
+if [ "$ENABLED" != "true" ]; then
+  echo "Expected sparse-checkout to be enabled (is: $ENABLED)"
+  exit 1
+fi
+
+SPARSE_CHECKOUT_FILE=$(git rev-parse --git-path info/sparse-checkout)
+
+if [ "$?" != "0" ]; then
+    echo "Failed to validate sparse-checkout"
+    exit 1
+fi
+
+# Check that sparse-checkout list is not empty
+if [ ! -f "$SPARSE_CHECKOUT_FILE" ]; then
+  echo "Expected sparse-checkout file to exist"
+  exit 1
+fi
+
+# Check that all folders from sparse-checkout exists
+for pattern in $(cat "$SPARSE_CHECKOUT_FILE")
+do
+  if [ ! -d "${pattern#/}" ]; then
+    echo "Expected directory '${pattern#/}' to exist"
+    exit 1
+  fi
+done
+
+# Verify that the root directory is not checked out
+if [ -f README.md ]; then
+  echo "Expected top-level files not to exist"
+  exit 1
+fi

__test__/verify-sparse-checkout.sh

@@ -0,0 +1,63 @@
+#!/bin/sh
+
+# Verify .git folder
+if [ ! -d "./sparse-checkout/.git" ]; then
+  echo "Expected ./sparse-checkout/.git folder to exist"
+  exit 1
+fi
+
+# Verify sparse-checkout
+cd sparse-checkout
+
+SPARSE=$(git sparse-checkout list)
+
+if [ "$?" != "0" ]; then
+    echo "Failed to validate sparse-checkout"
+    exit 1
+fi
+
+# Check that sparse-checkout list is not empty
+if [ -z "$SPARSE" ]; then
+  echo "Expected sparse-checkout list to not be empty"
+  exit 1
+fi
+
+# Check that all folders of the sparse checkout exist
+for pattern in $SPARSE
+do
+  if [ ! -d "$pattern" ]; then
+    echo "Expected directory '$pattern' to exist"
+    exit 1
+  fi
+done
+
+checkSparse () {
+  if [ ! -d "./$1" ]; then
+    echo "Expected directory '$1' to exist"
+    exit 1
+  fi
+
+  for file in $(git ls-tree -r --name-only HEAD $1)
+  do
+    if [ ! -f "$file" ]; then
+      echo "Expected file '$file' to exist"
+      exit 1
+    fi
+  done
+}
+
+# Check that all folders and their children have been checked out
+checkSparse __test__
+checkSparse .github
+checkSparse dist
+
+# Check that only sparse-checkout folders have been checked out
+for pattern in $(git ls-tree --name-only HEAD)
+do
+  if [ -d "$pattern" ]; then
+    if [[ "$pattern" != "__test__" && "$pattern" != ".github" && "$pattern" != "dist" ]]; then
+      echo "Expected directory '$pattern' to not exist"
+      exit 1
+    fi
+  fi
+done

action.yml

@@ -53,6 +53,15 @@ inputs:
   clean:
     description: 'Whether to execute `git clean -ffdx && git reset --hard HEAD` before fetching'
     default: true
+  sparse-checkout:
+    description: >
+      Do a sparse checkout on given patterns.
+      Each pattern should be separated with new lines
+    default: null
+  sparse-checkout-cone-mode:
+    description: >
+      Specifies whether to use cone-mode when doing a sparse checkout.
+    default: true
   fetch-depth:
     description: 'Number of commits to fetch. 0 indicates all history for all branches and tags.'
     default: 1

adrs/0153-checkout-v2.md

@@ -181,7 +181,7 @@ GITHUB_WORKSPACE=/home/runner/work/foo/foo
 RUNNER_WORKSPACE=/home/runner/work/foo
 ```
 
-V2 introduces a new contraint on the checkout path. The location must now be under `github.workspace`. Whereas the checkout@v1 constraint was one level up, under `runner.workspace`.
+V2 introduces a new constraint on the checkout path. The location must now be under `github.workspace`. Whereas the checkout@v1 constraint was one level up, under `runner.workspace`.
 
 V2 no longer changes `github.workspace` to follow wherever the self repo is checked-out.
 
@@ -287,4 +287,4 @@ Note:
 - Update samples to consume `actions/checkout@v2`
 - Job containers now require git in the PATH for checkout, otherwise fallback to REST API
 - Minimum git version 2.18
-- Update problem matcher logic regarding source file verification (runner)
+- Update problem matcher logic regarding source file verification (runner)

package.json

@@ -1,6 +1,6 @@
 {
   "name": "checkout",
-  "version": "3.2.0",
+  "version": "3.5.3",
   "description": "checkout action",
   "main": "lib/main.js",
   "scripts": {
@@ -30,7 +30,7 @@
   "dependencies": {
     "@actions/core": "^1.10.0",
     "@actions/exec": "^1.0.1",
-    "@actions/github": "^2.2.0",
+    "@actions/github": "^5.0.0",
     "@actions/io": "^1.1.3",
     "@actions/tool-cache": "^1.1.2",
     "uuid": "^3.3.3"

src/git-auth-helper.ts

@@ -247,7 +247,7 @@ class GitAuthHelper {
     if (this.settings.sshKnownHosts) {
       knownHosts += `# Begin from input known hosts\n${this.settings.sshKnownHosts}\n# end from input known hosts\n`
     }
-    knownHosts += `# Begin implicitly added github.com\ngithub.com ssh-rsa AAAAB3NzaC1yc2EAAAABIwAAAQEAq2A7hRGmdnm9tUDbO9IDSwBK6TbQa+PXYPCPy6rbTrTtw7PHkccKrpp0yVhp5HdEIcKr6pLlVDBfOLX9QUsyCOV0wzfjIJNlGEYsdlLJizHhbn2mUjvSAHQqZETYP81eFzLQNnPHt4EVVUh7VfDESU84KezmD5QlWpXLmvU31/yMf+Se8xhHTvKSCZIFImWwoG6mbUoWf9nzpIoaSjB+weqqUUmpaaasXVal72J+UX2B+2RPW3RcT0eOzQgqlJL3RKrTJvdsjE3JEAvGq3lGHSZXy28G3skua2SmVi/w4yCE6gbODqnTWlg7+wC604ydGXA8VJiS5ap43JXiUFFAaQ==\n# End implicitly added github.com\n`
+    knownHosts += `# Begin implicitly added github.com\ngithub.com ssh-rsa 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\n# End implicitly added github.com\n`
     this.sshKnownHostsPath = path.join(runnerTemp, `${uniqueId}_known_hosts`)
     stateHelper.setSshKnownHostsPath(this.sshKnownHostsPath)
     await fs.promises.writeFile(this.sshKnownHostsPath, knownHosts)

src/git-command-manager.ts

@@ -1,5 +1,6 @@
 import * as core from '@actions/core'
 import * as exec from '@actions/exec'
+import * as fs from 'fs'
 import * as fshelper from './fs-helper'
 import * as io from '@actions/io'
 import * as path from 'path'
@@ -16,6 +17,8 @@ export interface IGitCommandManager {
   branchDelete(remote: boolean, branch: string): Promise<void>
   branchExists(remote: boolean, pattern: string): Promise<boolean>
   branchList(remote: boolean): Promise<string[]>
+  sparseCheckout(sparseCheckout: string[]): Promise<void>
+  sparseCheckoutNonConeMode(sparseCheckout: string[]): Promise<void>
   checkout(ref: string, startPoint: string): Promise<void>
   checkoutDetach(): Promise<void>
   config(
@@ -25,7 +28,13 @@ export interface IGitCommandManager {
     add?: boolean
   ): Promise<void>
   configExists(configKey: string, globalConfig?: boolean): Promise<boolean>
-  fetch(refSpec: string[], fetchDepth?: number): Promise<void>
+  fetch(
+    refSpec: string[],
+    options: {
+      filter?: string
+      fetchDepth?: number
+    }
+  ): Promise<void>
   getDefaultBranch(repositoryUrl: string): Promise<string>
   getWorkingDirectory(): string
   init(): Promise<void>
@@ -41,6 +50,7 @@ export interface IGitCommandManager {
   submoduleForeach(command: string, recursive: boolean): Promise<string>
   submoduleSync(recursive: boolean): Promise<void>
   submoduleUpdate(fetchDepth: number, recursive: boolean): Promise<void>
+  submoduleStatus(): Promise<boolean>
   tagExists(pattern: string): Promise<boolean>
   tryClean(): Promise<boolean>
   tryConfigUnset(configKey: string, globalConfig?: boolean): Promise<boolean>
@@ -51,9 +61,14 @@ export interface IGitCommandManager {
 
 export async function createCommandManager(
   workingDirectory: string,
-  lfs: boolean
+  lfs: boolean,
+  doSparseCheckout: boolean
 ): Promise<IGitCommandManager> {
-  return await GitCommandManager.createCommandManager(workingDirectory, lfs)
+  return await GitCommandManager.createCommandManager(
+    workingDirectory,
+    lfs,
+    doSparseCheckout
+  )
 }
 
 class GitCommandManager {
@@ -63,6 +78,7 @@ class GitCommandManager {
   }
   private gitPath = ''
   private lfs = false
+  private doSparseCheckout = false
   private workingDirectory = ''
 
   // Private constructor; use createCommandManager()
@@ -153,6 +169,27 @@ class GitCommandManager {
     return result
   }
 
+  async sparseCheckout(sparseCheckout: string[]): Promise<void> {
+    await this.execGit(['sparse-checkout', 'set', ...sparseCheckout])
+  }
+
+  async sparseCheckoutNonConeMode(sparseCheckout: string[]): Promise<void> {
+    await this.execGit(['config', 'core.sparseCheckout', 'true'])
+    const output = await this.execGit([
+      'rev-parse',
+      '--git-path',
+      'info/sparse-checkout'
+    ])
+    const sparseCheckoutPath = path.join(
+      this.workingDirectory,
+      output.stdout.trimRight()
+    )
+    await fs.promises.appendFile(
+      sparseCheckoutPath,
+      `\n${sparseCheckout.join('\n')}\n`
+    )
+  }
+
   async checkout(ref: string, startPoint: string): Promise<void> {
     const args = ['checkout', '--progress', '--force']
     if (startPoint) {
@@ -201,15 +238,23 @@ class GitCommandManager {
     return output.exitCode === 0
   }
 
-  async fetch(refSpec: string[], fetchDepth?: number): Promise<void> {
+  async fetch(
+    refSpec: string[],
+    options: {filter?: string; fetchDepth?: number}
+  ): Promise<void> {
     const args = ['-c', 'protocol.version=2', 'fetch']
     if (!refSpec.some(x => x === refHelper.tagsRefSpec)) {
       args.push('--no-tags')
     }
 
     args.push('--prune', '--progress', '--no-recurse-submodules')
-    if (fetchDepth && fetchDepth > 0) {
+
-      args.push(`--depth=${fetchDepth}`)
+    if (options.filter) {
+      args.push(`--filter=${options.filter}`)
+    }
+
+    if (options.fetchDepth && options.fetchDepth > 0) {
+      args.push(`--depth=${options.fetchDepth}`)
     } else if (
       fshelper.fileExistsSync(
         path.join(this.workingDirectory, '.git', 'shallow')
@@ -357,6 +402,12 @@ class GitCommandManager {
     await this.execGit(args)
   }
 
+  async submoduleStatus(): Promise<boolean> {
+    const output = await this.execGit(['submodule', 'status'], true)
+    core.debug(output.stdout)
+    return output.exitCode === 0
+  }
+
   async tagExists(pattern: string): Promise<boolean> {
     const output = await this.execGit(['tag', '--list', pattern])
     return !!output.stdout.trim()
@@ -416,10 +467,15 @@ class GitCommandManager {
 
   static async createCommandManager(
     workingDirectory: string,
-    lfs: boolean
+    lfs: boolean,
+    doSparseCheckout: boolean
   ): Promise<GitCommandManager> {
     const result = new GitCommandManager()
-    await result.initializeCommandManager(workingDirectory, lfs)
+    await result.initializeCommandManager(
+      workingDirectory,
+      lfs,
+      doSparseCheckout
+    )
     return result
   }
 
@@ -469,7 +525,8 @@ class GitCommandManager {
 
   private async initializeCommandManager(
     workingDirectory: string,
-    lfs: boolean
+    lfs: boolean,
+    doSparseCheckout: boolean
   ): Promise<void> {
     this.workingDirectory = workingDirectory
 
@@ -532,6 +589,16 @@ 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)) {
+        throw new Error(
+          `Minimum Git version required for sparse checkout is ${minimumGitSparseCheckoutVersion}. Your git ('${this.gitPath}') is ${gitVersion}`
+        )
+      }
+    }
     // Set the user agent
     const gitHttpUserAgent = `git/${gitVersion} (github-actions-checkout)`
     core.debug(`Set git useragent to: ${gitHttpUserAgent}`)

src/git-directory-helper.ts

@@ -81,12 +81,18 @@ export async function prepareExistingDirectory(
       }
       core.endGroup()
 
+      // Check for submodules and delete any existing files if submodules are present
+      if (!(await git.submoduleStatus())) {
+        remove = true
+        core.info('Bad Submodules found, removing existing files')
+      }
+
       // Clean
       if (clean) {
         core.startGroup('Cleaning the repository')
         if (!(await git.tryClean())) {
           core.debug(
-            `The clean command failed. This might be caused by: 1) path too long, 2) permission issue, or 3) file in use. For futher investigation, manually run 'git clean -ffdx' on the directory '${repositoryPath}'.`
+            `The clean command failed. This might be caused by: 1) path too long, 2) permission issue, or 3) file in use. For further investigation, manually run 'git clean -ffdx' on the directory '${repositoryPath}'.`
           )
           remove = true
         } else if (!(await git.tryReset())) {

src/git-source-provider.ts

@@ -153,23 +153,26 @@ export async function getSource(settings: IGitSourceSettings): Promise<void> {
 
     // Fetch
     core.startGroup('Fetching the repository')
+    const fetchOptions: {filter?: string; fetchDepth?: number} = {}
+    if (settings.sparseCheckout) fetchOptions.filter = 'blob:none'
     if (settings.fetchDepth <= 0) {
       // Fetch all branches and tags
       let refSpec = refHelper.getRefSpecForAllHistory(
         settings.ref,
         settings.commit
       )
-      await git.fetch(refSpec)
+      await git.fetch(refSpec, fetchOptions)
 
       // When all history is fetched, the ref we're interested in may have moved to a different
       // commit (push or force push). If so, fetch again with a targeted refspec.
       if (!(await refHelper.testRef(git, settings.ref, settings.commit))) {
         refSpec = refHelper.getRefSpec(settings.ref, settings.commit)
-        await git.fetch(refSpec)
+        await git.fetch(refSpec, fetchOptions)
       }
     } else {
+      fetchOptions.fetchDepth = settings.fetchDepth
       const refSpec = refHelper.getRefSpec(settings.ref, settings.commit)
-      await git.fetch(refSpec, settings.fetchDepth)
+      await git.fetch(refSpec, fetchOptions)
     }
     core.endGroup()
 
@@ -185,12 +188,24 @@ export async function getSource(settings: IGitSourceSettings): Promise<void> {
     // LFS fetch
     // Explicit lfs-fetch to avoid slow checkout (fetches one lfs object at a time).
     // Explicit lfs fetch will fetch lfs objects in parallel.
-    if (settings.lfs) {
+    // For sparse checkouts, let `checkout` fetch the needed objects lazily.
+    if (settings.lfs && !settings.sparseCheckout) {
       core.startGroup('Fetching LFS objects')
       await git.lfsFetch(checkoutInfo.startPoint || checkoutInfo.ref)
       core.endGroup()
     }
 
+    // Sparse checkout
+    if (settings.sparseCheckout) {
+      core.startGroup('Setting up sparse checkout')
+      if (settings.sparseCheckoutConeMode) {
+        await git.sparseCheckout(settings.sparseCheckout)
+      } else {
+        await git.sparseCheckoutNonConeMode(settings.sparseCheckout)
+      }
+      core.endGroup()
+    }
+
     // Checkout
     core.startGroup('Checking out the ref')
     await git.checkout(checkoutInfo.ref, checkoutInfo.startPoint)
@@ -261,7 +276,11 @@ export async function cleanup(repositoryPath: string): Promise<void> {
 
   let git: IGitCommandManager
   try {
-    git = await gitCommandManager.createCommandManager(repositoryPath, false)
+    git = await gitCommandManager.createCommandManager(
+      repositoryPath,
+      false,
+      false
+    )
   } catch {
     return
   }
@@ -297,7 +316,8 @@ async function getGitCommandManager(
   try {
     return await gitCommandManager.createCommandManager(
       settings.repositoryPath,
-      settings.lfs
+      settings.lfs,
+      settings.sparseCheckout != null
     )
   } catch (err) {
     // Git is required for LFS

src/git-source-settings.ts

@@ -29,6 +29,16 @@ export interface IGitSourceSettings {
    */
   clean: boolean
 
+  /**
+   * The array of folders to make the sparse checkout
+   */
+  sparseCheckout: string[]
+
+  /**
+   * Indicates whether to use cone mode in the sparse checkout (if any)
+   */
+  sparseCheckoutConeMode: boolean
+
   /**
    * The depth when fetching
    */

src/github-api-helper.ts

@@ -1,12 +1,13 @@
 import * as assert from 'assert'
 import * as core from '@actions/core'
 import * as fs from 'fs'
+import * as github from '@actions/github'
 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 {getOctokit, Octokit} from './octokit-provider'
+import {getServerApiUrl} from './url-helper'
 
 const IS_WINDOWS = process.platform === 'win32'
 
@@ -84,11 +85,13 @@ export async function getDefaultBranch(
 ): Promise<string> {
   return await retryHelper.execute(async () => {
     core.info('Retrieving the default branch name')
-    const octokit = getOctokit(authToken, {baseUrl: baseUrl})
+    const octokit = github.getOctokit(authToken, {
+      baseUrl: getServerApiUrl(baseUrl)
+    })
     let result: string
     try {
       // Get the default branch from the repo info
-      const response = await octokit.repos.get({owner, repo})
+      const response = await octokit.rest.repos.get({owner, repo})
       result = response.data.default_branch
       assert.ok(result, 'default_branch cannot be empty')
     } catch (err) {
@@ -125,19 +128,16 @@ async function downloadArchive(
   commit: string,
   baseUrl?: string
 ): Promise<Buffer> {
-  const octokit = getOctokit(authToken, {baseUrl: baseUrl})
+  const octokit = github.getOctokit(authToken, {
-  const params: Octokit.ReposGetArchiveLinkParams = {
+    baseUrl: getServerApiUrl(baseUrl)
+  })
+  const download = IS_WINDOWS
+    ? octokit.rest.repos.downloadZipballArchive
+    : octokit.rest.repos.downloadTarballArchive
+  const response = await download({
     owner: owner,
     repo: repo,
-    archive_format: IS_WINDOWS ? 'zipball' : 'tarball',
     ref: commit || ref
-  }
+  })
-  const response = await octokit.repos.getArchiveLink(params)
+  return Buffer.from(response.data as ArrayBuffer) // response.data is ArrayBuffer
-  if (response.status != 200) {
-    throw new Error(
-      `Unexpected response from GitHub API. Status: ${response.status}, Data: ${response.data}`
-    )
-  }
-
-  return Buffer.from(response.data) // response.data is ArrayBuffer
 }

src/input-helper.ts

@@ -82,6 +82,17 @@ export async function getInputs(): Promise<IGitSourceSettings> {
   result.clean = (core.getInput('clean') || 'true').toUpperCase() === 'TRUE'
   core.debug(`clean = ${result.clean}`)
 
+  // Sparse checkout
+  const sparseCheckout = core.getMultilineInput('sparse-checkout')
+  if (sparseCheckout.length) {
+    result.sparseCheckout = sparseCheckout
+    core.debug(`sparse checkout = ${result.sparseCheckout}`)
+  }
+
+  result.sparseCheckoutConeMode =
+    (core.getInput('sparse-checkout-cone-mode') || 'true').toUpperCase() ===
+    'TRUE'
+
   // Fetch depth
   result.fetchDepth = Math.floor(Number(core.getInput('fetch-depth') || '1'))
   if (isNaN(result.fetchDepth) || result.fetchDepth < 0) {

src/octokit-provider.ts

@@ -1,23 +0,0 @@
-import * as github from '@actions/github'
-import {Octokit} from '@octokit/rest'
-import {getServerApiUrl} from './url-helper'
-
-// Centralize all Octokit references by re-exporting
-export {Octokit} from '@octokit/rest'
-
-export type OctokitOptions = {
-  baseUrl?: string
-  userAgent?: string
-}
-
-export function getOctokit(authToken: string, opts: OctokitOptions) {
-  const options: Octokit.Options = {
-    baseUrl: getServerApiUrl(opts.baseUrl)
-  }
-
-  if (opts.userAgent) {
-    options.userAgent = opts.userAgent
-  }
-
-  return new github.GitHub(authToken, options)
-}

src/ref-helper.ts

@@ -1,8 +1,7 @@
 import {IGitCommandManager} from './git-command-manager'
 import * as core from '@actions/core'
 import * as github from '@actions/github'
-import {getOctokit} from './octokit-provider'
+import {getServerApiUrl, isGhes} from './url-helper'
-import {isGhes} from './url-helper'
 
 export const tagsRefSpec = '+refs/tags/*:refs/tags/*'
 
@@ -245,15 +244,18 @@ export async function checkCommitInfo(
       core.debug(
         `Expected head sha ${expectedHeadSha}; actual head sha ${actualHeadSha}`
       )
-      const octokit = getOctokit(token, {
+      const octokit = github.getOctokit(token, {
-        baseUrl: baseUrl,
+        baseUrl: getServerApiUrl(baseUrl),
         userAgent: `actions-checkout-tracepoint/1.0 (code=STALE_MERGE;owner=${repositoryOwner};repo=${repositoryName};pr=${fromPayload(
           'number'
         )};run_id=${
           process.env['GITHUB_RUN_ID']
         };expected_head_sha=${expectedHeadSha};actual_head_sha=${actualHeadSha})`
       })
-      await octokit.repos.get({owner: repositoryOwner, repo: repositoryName})
+      await octokit.rest.repos.get({
+        owner: repositoryOwner,
+        repo: repositoryName
+      })
     }
   } catch (err) {
     core.debug(