Merge 14150cf66c into 8e8c483db8

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

.github/copilot-instructions.md

@@ -0,0 +1,121 @@
+# GitHub Actions Checkout - AI Coding Instructions
+
+## Project Overview
+
+This is the official `actions/checkout` GitHub Action for checking out repositories in workflows. It's a TypeScript project that compiles to a single bundled JavaScript file (`dist/index.js`) and supports both git-based and REST API-based repository downloads.
+
+## Architecture & Key Components
+
+### Core Entry Points
+- **`src/main.ts`**: Main entry point with `run()` and `cleanup()` functions, determined by `stateHelper.IsPost`
+- **`src/git-source-provider.ts`**: Primary orchestrator for repository acquisition (git vs REST API fallback)
+- **`src/input-helper.ts`**: Input validation and GitHub Actions input processing
+- **`action.yml`**: Defines the action interface with comprehensive input/output schema
+
+### Critical Data Flow
+1. `main.ts` → `inputHelper.getInputs()` → validates and transforms action inputs
+2. `main.ts` → `gitSourceProvider.getSource(settings)` → orchestrates repository download
+3. `git-source-provider.ts` decides: use Git CLI or fallback to GitHub REST API
+4. State management via `state-helper.ts` for POST action cleanup
+
+### Authentication & Security Patterns
+- **Token-based auth**: Uses `@actions/core` to handle GitHub tokens securely
+- **SSH key management**: Configures temporary SSH keys in `git-auth-helper.ts`
+- **Safe directory**: Automatically configures `git config safe.directory` for container compatibility
+
+## Development Workflow
+
+### Essential Commands
+```bash
+npm ci                    # Install dependencies
+npm run build            # TypeScript → JavaScript + bundle with ncc + generate docs
+npm run format           # Prettier formatting
+npm run lint            # ESLint validation
+npm test                # Jest test suite
+```
+
+### Build Process (Critical!)
+- **`npm run build`** runs: `tsc && ncc build && node lib/misc/generate-docs.js`
+- **Documentation sync**: `src/misc/generate-docs.ts` auto-updates README.md usage section from `action.yml`
+- **Bundling**: Uses `@vercel/ncc` to create single `dist/index.js` file
+- **Always run `npm run build` before commits** - the `dist/` directory must be up-to-date
+
+### Testing Strategy
+- **Unit tests**: Jest tests in `__test__/` for all core modules
+- **Integration tests**: Shell scripts (`__test__/verify-*.sh`) test real git operations
+- **E2E tests**: `.github/workflows/test.yml` tests across OS matrix with actual GitHub repos
+
+## Project-Specific Conventions
+
+### TypeScript Patterns
+- **Interface-driven**: `IGitSourceSettings` centralizes all configuration
+- **Async/await**: All I/O operations use async patterns, not promises
+- **Error handling**: Use `core.setFailed()` for action failures, `core.warning()` for non-critical issues
+
+### Git Operation Patterns
+```typescript
+// Check Git version and fallback pattern
+const git = await getGitCommandManager(settings)
+if (git) {
+  // Use Git CLI
+  await git.fetch(refSpec, fetchDepth)
+} else {
+  // Fallback to REST API
+  await githubApiHelper.downloadRepository(...)
+}
+```
+
+### State Management (Unique Pattern!)
+- **Dual-phase execution**: Same script runs twice (MAIN + POST) determined by `stateHelper.IsPost`
+- **State persistence**: Use `core.saveState()` / `core.getState()` to pass data between phases
+- **Cleanup responsibility**: POST phase cleans up auth tokens, SSH keys, etc.
+
+### Input Validation Approach
+- **GitHub context integration**: Defaults repository from `github.context.repo`
+- **Path safety**: Validates paths are within `GITHUB_WORKSPACE`
+- **Flexible refs**: Handles branches, tags, SHAs, and PR refs uniformly
+
+## Integration Points
+
+### GitHub Actions SDK Usage
+- **`@actions/core`**: Input/output, logging, state management
+- **`@actions/github`**: GitHub context and API access
+- **`@actions/exec`**: Git command execution
+- **`@actions/io`**: File system operations
+
+### Git Integration
+- **Version compatibility**: Minimum Git 2.18, with feature detection for sparse-checkout
+- **Authentication modes**: Token-based (default) or SSH key-based
+- **Advanced features**: LFS, submodules, sparse-checkout, partial clones
+
+### Container Support
+- **Safe directory**: Critical for container workflows - auto-configures git safe.directory
+- **Credential persistence**: Configures git credential helper for authenticated operations
+
+## Common Debugging Patterns
+
+### Enable Debug Logging
+```yaml
+steps:
+  - uses: actions/checkout@v5
+    env:
+      ACTIONS_STEP_DEBUG: true
+```
+
+### REST API Fallback Testing
+```bash
+# Force REST API mode by overriding Git version
+__test__/override-git-version.sh
+```
+
+### Authentication Issues
+- Check `GITHUB_TOKEN` permissions: needs `contents: read`
+- For private repos: requires PAT with repo access
+- Container issues: verify safe.directory configuration
+
+## Key Files for Understanding
+- `src/git-source-provider.ts` - Main orchestration logic
+- `src/input-helper.ts` - Action interface and validation
+- `src/git-auth-helper.ts` - Authentication and credential management
+- `action.yml` - Complete input/output specification
+- `.github/workflows/test.yml` - Comprehensive test scenarios

.github/workflows/deno.yml

@@ -0,0 +1,41 @@
+# This workflow uses actions that are not certified by GitHub.
+# They are provided by a third-party and are governed by
+# separate terms of service, privacy policy, and support
+# documentation.
+
+# This workflow will install Deno then run `deno lint` and `deno test`.
+# For more information see: https://github.com/denoland/setup-deno
+
+name: Deno
+
+on:
+  push:
+    branches: ["main"]
+  pull_request:
+    branches: ["main"]
+
+permissions:
+  contents: read
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Setup repo
+        uses: actions/checkout@v4
+
+      - name: Setup Deno
+        uses: denoland/setup-deno@v1.1.2
+        with:
+          deno-version: v1.x
+
+      # Uncomment this step to verify the use of 'deno fmt' on each commit.
+      # - name: Verify formatting
+      #   run: deno fmt --check
+
+      - name: Run linter
+        run: deno lint
+
+      - name: Run tests
+        run: deno test -A

.github/workflows/test.yml

@@ -87,17 +87,6 @@ jobs:
       - name: Verify fetch filter
         run: __test__/verify-fetch-filter.sh
 
-      # Fetch tags
-      - name: Checkout with fetch-tags
-        uses: ./
-        with:
-          ref: test-data/v2/basic
-          path: fetch-tags-test
-          fetch-tags: true
-      - name: Verify fetch-tags
-        shell: bash
-        run: __test__/verify-fetch-tags.sh
-
       # Sparse checkout
       - name: Sparse checkout
         uses: ./

CHANGELOG.md

@@ -1,15 +1,5 @@
 # Changelog
 
-## v6.0.3
-* Fix checkout init for SHA-256 repositories by @yaananth in https://github.com/actions/checkout/pull/2439
-* fix: expand merge commit SHA regex and add SHA-256 test cases by @yaananth in https://github.com/actions/checkout/pull/2414
-
-## v6.0.2
-* Fix tag handling: preserve annotations and explicit fetch-tags by @ericsciple in https://github.com/actions/checkout/pull/2356
-
-## v6.0.1
-* Add worktree support for persist-credentials includeIf by @ericsciple in https://github.com/actions/checkout/pull/2327
-
 ## v6.0.0
 * Persist creds to a separate file by @ericsciple in https://github.com/actions/checkout/pull/2286
 * Update README to include Node.js 24 support details and requirements by @salmanmkc in https://github.com/actions/checkout/pull/2248

LICENSE

@@ -1,22 +1,201 @@
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README.md

@@ -160,15 +160,6 @@ Please refer to the [release page](https://github.com/actions/checkout/releases/
     # running from unless specified. Example URLs are https://github.com or
     # https://my-ghes-server.example.com
     github-server-url: ''
-
-    # Required to check out fork pull request code from a workflow triggered by
-    # `pull_request_target` or `workflow_run`. These workflows run with the base
-    # repository's GITHUB_TOKEN, secrets, default-branch cache scope, and runner
-    # access; fetching and executing a fork's code in that trusted context commonly
-    # leads to "pwn request" vulnerabilities. Set to `true` only after reviewing the
-    # risks at https://gh.io/securely-using-pull_request_target.
-    # Default: false
-    allow-unsafe-pr-checkout: ''
 ```
 <!-- end usage -->
 

__test__/git-auth-helper.test.ts

@@ -1173,8 +1173,7 @@ async function setup(testName: string): Promise<void> {
     sshUser: '',
     workflowOrganizationId: 123456,
     setSafeDirectory: true,
-    githubServerUrl: githubServerUrl,
-    allowUnsafePrCheckout: false
+    githubServerUrl: githubServerUrl
   }
 }
 

__test__/git-command-manager.test.ts

@@ -108,7 +108,7 @@ describe('Test fetchDepth and fetchTags options', () => {
     jest.restoreAllMocks()
   })
 
-  it('should call execGit with the correct arguments when fetchDepth is 0', async () => {
+  it('should call execGit with the correct arguments when fetchDepth is 0 and fetchTags is true', async () => {
     jest.spyOn(exec, 'exec').mockImplementation(mockExec)
     const workingDirectory = 'test'
     const lfs = false
@@ -122,7 +122,45 @@ describe('Test fetchDepth and fetchTags options', () => {
     const refSpec = ['refspec1', 'refspec2']
     const options = {
       filter: 'filterValue',
-      fetchDepth: 0
+      fetchDepth: 0,
+      fetchTags: true
+    }
+
+    await git.fetch(refSpec, options)
+
+    expect(mockExec).toHaveBeenCalledWith(
+      expect.any(String),
+      [
+        '-c',
+        'protocol.version=2',
+        'fetch',
+        '--prune',
+        '--no-recurse-submodules',
+        '--filter=filterValue',
+        'origin',
+        'refspec1',
+        'refspec2'
+      ],
+      expect.any(Object)
+    )
+  })
+
+  it('should call execGit with the correct arguments when fetchDepth is 0 and fetchTags is false', async () => {
+    jest.spyOn(exec, 'exec').mockImplementation(mockExec)
+
+    const workingDirectory = 'test'
+    const lfs = false
+    const doSparseCheckout = false
+    git = await commandManager.createCommandManager(
+      workingDirectory,
+      lfs,
+      doSparseCheckout
+    )
+    const refSpec = ['refspec1', 'refspec2']
+    const options = {
+      filter: 'filterValue',
+      fetchDepth: 0,
+      fetchTags: false
     }
 
     await git.fetch(refSpec, options)
@@ -145,45 +183,7 @@ describe('Test fetchDepth and fetchTags options', () => {
     )
   })
 
-  it('should call execGit with the correct arguments when fetchDepth is 0 and refSpec includes tags', async () => {
-    jest.spyOn(exec, 'exec').mockImplementation(mockExec)
-
-    const workingDirectory = 'test'
-    const lfs = false
-    const doSparseCheckout = false
-    git = await commandManager.createCommandManager(
-      workingDirectory,
-      lfs,
-      doSparseCheckout
-    )
-    const refSpec = ['refspec1', 'refspec2', '+refs/tags/*:refs/tags/*']
-    const options = {
-      filter: 'filterValue',
-      fetchDepth: 0
-    }
-
-    await git.fetch(refSpec, options)
-
-    expect(mockExec).toHaveBeenCalledWith(
-      expect.any(String),
-      [
-        '-c',
-        'protocol.version=2',
-        'fetch',
-        '--no-tags',
-        '--prune',
-        '--no-recurse-submodules',
-        '--filter=filterValue',
-        'origin',
-        'refspec1',
-        'refspec2',
-        '+refs/tags/*:refs/tags/*'
-      ],
-      expect.any(Object)
-    )
-  })
-
-  it('should call execGit with the correct arguments when fetchDepth is 1', async () => {
+  it('should call execGit with the correct arguments when fetchDepth is 1 and fetchTags is false', async () => {
     jest.spyOn(exec, 'exec').mockImplementation(mockExec)
 
     const workingDirectory = 'test'
@@ -197,7 +197,8 @@ describe('Test fetchDepth and fetchTags options', () => {
     const refSpec = ['refspec1', 'refspec2']
     const options = {
       filter: 'filterValue',
-      fetchDepth: 1
+      fetchDepth: 1,
+      fetchTags: false
     }
 
     await git.fetch(refSpec, options)
@@ -221,7 +222,7 @@ describe('Test fetchDepth and fetchTags options', () => {
     )
   })
 
-  it('should call execGit with the correct arguments when fetchDepth is 1 and refSpec includes tags', async () => {
+  it('should call execGit with the correct arguments when fetchDepth is 1 and fetchTags is true', async () => {
     jest.spyOn(exec, 'exec').mockImplementation(mockExec)
 
     const workingDirectory = 'test'
@@ -232,10 +233,11 @@ describe('Test fetchDepth and fetchTags options', () => {
       lfs,
       doSparseCheckout
     )
-    const refSpec = ['refspec1', 'refspec2', '+refs/tags/*:refs/tags/*']
+    const refSpec = ['refspec1', 'refspec2']
     const options = {
       filter: 'filterValue',
-      fetchDepth: 1
+      fetchDepth: 1,
+      fetchTags: true
     }
 
     await git.fetch(refSpec, options)
@@ -246,15 +248,13 @@ describe('Test fetchDepth and fetchTags options', () => {
         '-c',
         'protocol.version=2',
         'fetch',
-        '--no-tags',
         '--prune',
         '--no-recurse-submodules',
         '--filter=filterValue',
         '--depth=1',
         'origin',
         'refspec1',
-        'refspec2',
-        '+refs/tags/*:refs/tags/*'
+        'refspec2'
       ],
       expect.any(Object)
     )
@@ -338,7 +338,7 @@ describe('Test fetchDepth and fetchTags options', () => {
     )
   })
 
-  it('should call execGit with the correct arguments when showProgress is true and refSpec includes tags', async () => {
+  it('should call execGit with the correct arguments when fetchTags is true and showProgress is true', async () => {
     jest.spyOn(exec, 'exec').mockImplementation(mockExec)
 
     const workingDirectory = 'test'
@@ -349,9 +349,10 @@ describe('Test fetchDepth and fetchTags options', () => {
       lfs,
       doSparseCheckout
     )
-    const refSpec = ['refspec1', 'refspec2', '+refs/tags/*:refs/tags/*']
+    const refSpec = ['refspec1', 'refspec2']
     const options = {
       filter: 'filterValue',
+      fetchTags: true,
       showProgress: true
     }
 
@@ -363,187 +364,15 @@ describe('Test fetchDepth and fetchTags options', () => {
         '-c',
         'protocol.version=2',
         'fetch',
-        '--no-tags',
         '--prune',
         '--no-recurse-submodules',
         '--progress',
         '--filter=filterValue',
         'origin',
         'refspec1',
-        'refspec2',
-        '+refs/tags/*:refs/tags/*'
+        'refspec2'
       ],
       expect.any(Object)
     )
   })
 })
-
-describe('repository initialization object format', () => {
-  beforeEach(async () => {
-    jest.spyOn(fshelper, 'fileExistsSync').mockImplementation(jest.fn())
-    jest.spyOn(fshelper, 'directoryExistsSync').mockImplementation(jest.fn())
-  })
-
-  afterEach(() => {
-    jest.restoreAllMocks()
-  })
-
-  it('initializes SHA-256 repositories with the matching object format', async () => {
-    mockExec.mockImplementation((path, args, options) => {
-      if (args.includes('version')) {
-        options.listeners.stdout(Buffer.from('git version 2.50.1'))
-      }
-
-      return 0
-    })
-    jest.spyOn(exec, 'exec').mockImplementation(mockExec)
-
-    git = await commandManager.createCommandManager('test', false, false)
-
-    await git.init('sha256')
-
-    expect(mockExec).toHaveBeenCalledWith(
-      expect.any(String),
-      ['init', '--object-format=sha256', 'test'],
-      expect.any(Object)
-    )
-  })
-
-  it('initializes SHA-1 repositories with existing default arguments', async () => {
-    mockExec.mockImplementation((path, args, options) => {
-      if (args.includes('version')) {
-        options.listeners.stdout(Buffer.from('git version 2.50.1'))
-      }
-
-      return 0
-    })
-    jest.spyOn(exec, 'exec').mockImplementation(mockExec)
-
-    git = await commandManager.createCommandManager('test', false, false)
-
-    await git.init('sha1')
-
-    expect(mockExec).toHaveBeenCalledWith(
-      expect.any(String),
-      ['init', 'test'],
-      expect.any(Object)
-    )
-  })
-})
-
-describe('git user-agent with orchestration ID', () => {
-  beforeEach(async () => {
-    jest.spyOn(fshelper, 'fileExistsSync').mockImplementation(jest.fn())
-    jest.spyOn(fshelper, 'directoryExistsSync').mockImplementation(jest.fn())
-  })
-
-  afterEach(() => {
-    jest.restoreAllMocks()
-    // Clean up environment variable to prevent test pollution
-    delete process.env['ACTIONS_ORCHESTRATION_ID']
-  })
-
-  it('should include orchestration ID in user-agent when ACTIONS_ORCHESTRATION_ID is set', async () => {
-    const orchId = 'test-orch-id-12345'
-    process.env['ACTIONS_ORCHESTRATION_ID'] = orchId
-
-    let capturedEnv: any = null
-    mockExec.mockImplementation((path, args, options) => {
-      if (args.includes('version')) {
-        options.listeners.stdout(Buffer.from('2.18'))
-      }
-      // Capture env on any command
-      capturedEnv = options.env
-      return 0
-    })
-    jest.spyOn(exec, 'exec').mockImplementation(mockExec)
-
-    const workingDirectory = 'test'
-    const lfs = false
-    const doSparseCheckout = false
-    git = await commandManager.createCommandManager(
-      workingDirectory,
-      lfs,
-      doSparseCheckout
-    )
-
-    // Call a git command to trigger env capture after user-agent is set
-    await git.init()
-
-    // Verify the user agent includes the orchestration ID
-    expect(git).toBeDefined()
-    expect(capturedEnv).toBeDefined()
-    expect(capturedEnv['GIT_HTTP_USER_AGENT']).toBe(
-      `git/2.18 (github-actions-checkout) actions_orchestration_id/${orchId}`
-    )
-  })
-
-  it('should sanitize invalid characters in orchestration ID', async () => {
-    const orchId = 'test (with) special/chars'
-    process.env['ACTIONS_ORCHESTRATION_ID'] = orchId
-
-    let capturedEnv: any = null
-    mockExec.mockImplementation((path, args, options) => {
-      if (args.includes('version')) {
-        options.listeners.stdout(Buffer.from('2.18'))
-      }
-      // Capture env on any command
-      capturedEnv = options.env
-      return 0
-    })
-    jest.spyOn(exec, 'exec').mockImplementation(mockExec)
-
-    const workingDirectory = 'test'
-    const lfs = false
-    const doSparseCheckout = false
-    git = await commandManager.createCommandManager(
-      workingDirectory,
-      lfs,
-      doSparseCheckout
-    )
-
-    // Call a git command to trigger env capture after user-agent is set
-    await git.init()
-
-    // Verify the user agent has sanitized orchestration ID (spaces, parentheses, slash replaced)
-    expect(git).toBeDefined()
-    expect(capturedEnv).toBeDefined()
-    expect(capturedEnv['GIT_HTTP_USER_AGENT']).toBe(
-      'git/2.18 (github-actions-checkout) actions_orchestration_id/test__with__special_chars'
-    )
-  })
-
-  it('should not modify user-agent when ACTIONS_ORCHESTRATION_ID is not set', async () => {
-    delete process.env['ACTIONS_ORCHESTRATION_ID']
-
-    let capturedEnv: any = null
-    mockExec.mockImplementation((path, args, options) => {
-      if (args.includes('version')) {
-        options.listeners.stdout(Buffer.from('2.18'))
-      }
-      // Capture env on any command
-      capturedEnv = options.env
-      return 0
-    })
-    jest.spyOn(exec, 'exec').mockImplementation(mockExec)
-
-    const workingDirectory = 'test'
-    const lfs = false
-    const doSparseCheckout = false
-    git = await commandManager.createCommandManager(
-      workingDirectory,
-      lfs,
-      doSparseCheckout
-    )
-
-    // Call a git command to trigger env capture after user-agent is set
-    await git.init()
-
-    // Verify the user agent does NOT contain orchestration ID
-    expect(git).toBeDefined()
-    expect(capturedEnv).toBeDefined()
-    expect(capturedEnv['GIT_HTTP_USER_AGENT']).toBe(
-      'git/2.18 (github-actions-checkout)'
-    )
-  })
-})

__test__/github-api-helper.test.ts

@@ -1,98 +0,0 @@
-import * as core from '@actions/core'
-import * as github from '@actions/github'
-import * as githubApiHelper from '../lib/github-api-helper'
-
-describe('github-api-helper object format', () => {
-  let getOctokitSpy: jest.SpyInstance
-  let debugSpy: jest.SpyInstance
-  let request: jest.Mock
-
-  function mockHashAlgorithmApi(hashAlgorithm: string): void {
-    request = jest.fn(async () => ({
-      data: {
-        hash_algorithm: hashAlgorithm
-      }
-    }))
-    getOctokitSpy = jest.spyOn(github, 'getOctokit').mockReturnValue({
-      request
-    } as any)
-  }
-
-  beforeEach(() => {
-    debugSpy = jest.spyOn(core, 'debug').mockImplementation(jest.fn())
-  })
-
-  afterEach(() => {
-    jest.restoreAllMocks()
-  })
-
-  it('detects SHA-256 from the repository hash algorithm endpoint', async () => {
-    mockHashAlgorithmApi('sha256')
-
-    await expect(
-      githubApiHelper.tryGetRepositoryObjectFormat('token', 'owner', 'repo')
-    ).resolves.toEqual({format: 'sha256', succeeded: true})
-
-    expect(getOctokitSpy).toHaveBeenCalledWith(
-      'token',
-      expect.objectContaining({baseUrl: 'https://api.github.com'})
-    )
-    expect(request).toHaveBeenCalledWith(
-      'GET /repos/{owner}/{repo}/hash-algorithm',
-      {owner: 'owner', repo: 'repo'}
-    )
-  })
-
-  it('detects SHA-1 from the repository hash algorithm endpoint', async () => {
-    mockHashAlgorithmApi('sha1')
-
-    await expect(
-      githubApiHelper.tryGetRepositoryObjectFormat('token', 'owner', 'repo')
-    ).resolves.toEqual({format: 'sha1', succeeded: true})
-  })
-
-  it('detects object format from an existing commit without API calls', async () => {
-    const commitSha =
-      '9422233ca7ee1b17f1e905d0e141faf0c401556c41cdc6acd71c6bd685da2e92'
-    getOctokitSpy = jest.spyOn(github, 'getOctokit')
-
-    await expect(
-      githubApiHelper.tryGetRepositoryObjectFormat(
-        'token',
-        'owner',
-        'repo',
-        undefined,
-        commitSha
-      )
-    ).resolves.toEqual({format: 'sha256', succeeded: true})
-
-    expect(getOctokitSpy).not.toHaveBeenCalled()
-  })
-
-  it('returns unsuccessful when the hash algorithm endpoint value is not recognized', async () => {
-    mockHashAlgorithmApi('unknown')
-
-    await expect(
-      githubApiHelper.tryGetRepositoryObjectFormat('token', 'owner', 'repo')
-    ).resolves.toEqual({format: '', succeeded: false})
-    expect(debugSpy).toHaveBeenCalledWith(
-      'Unable to determine repository object format from hash-algorithm endpoint'
-    )
-  })
-
-  it('returns unsuccessful when the hash algorithm API lookup fails', async () => {
-    request = jest.fn(async () => {
-      throw new Error('not found')
-    })
-    jest.spyOn(github, 'getOctokit').mockReturnValue({
-      request
-    } as any)
-
-    await expect(
-      githubApiHelper.tryGetRepositoryObjectFormat('token', 'owner', 'repo')
-    ).resolves.toEqual({format: '', succeeded: false})
-    expect(debugSpy).toHaveBeenCalledWith(
-      'Unable to determine repository object format from hash-algorithm endpoint: not found'
-    )
-  })
-})

__test__/input-helper.test.ts

@@ -91,7 +91,6 @@ describe('input-helper tests', () => {
     expect(settings.repositoryOwner).toBe('some-owner')
     expect(settings.repositoryPath).toBe(gitHubWorkspace)
     expect(settings.setSafeDirectory).toBe(true)
-    expect(settings.allowUnsafePrCheckout).toBe(false)
   })
 
   it('qualifies ref', async () => {
@@ -134,16 +133,6 @@ describe('input-helper tests', () => {
     expect(settings.commit).toBe('1111111111222222222233333333334444444444')
   })
 
-  it('sets ref to empty when explicit sha-256', async () => {
-    inputs.ref =
-      '1111111111222222222233333333334444444444555555555566666666667777'
-    const settings: IGitSourceSettings = await inputHelper.getInputs()
-    expect(settings.ref).toBeFalsy()
-    expect(settings.commit).toBe(
-      '1111111111222222222233333333334444444444555555555566666666667777'
-    )
-  })
-
   it('sets sha to empty when explicit ref', async () => {
     inputs.ref = 'refs/heads/some-other-ref'
     const settings: IGitSourceSettings = await inputHelper.getInputs()

__test__/ref-helper.test.ts

@@ -1,12 +1,8 @@
 import * as assert from 'assert'
-import * as core from '@actions/core'
-import * as github from '@actions/github'
 import * as refHelper from '../lib/ref-helper'
 import {IGitCommandManager} from '../lib/git-command-manager'
 
 const commit = '1234567890123456789012345678901234567890'
-const sha256Commit =
-  '1234567890123456789012345678901234567890123456789012345678901234'
 let git: IGitCommandManager
 
 describe('ref-helper tests', () => {
@@ -41,12 +37,6 @@ describe('ref-helper tests', () => {
     expect(checkoutInfo.startPoint).toBeFalsy()
   })
 
-  it('getCheckoutInfo sha-256 only', async () => {
-    const checkoutInfo = await refHelper.getCheckoutInfo(git, '', sha256Commit)
-    expect(checkoutInfo.ref).toBe(sha256Commit)
-    expect(checkoutInfo.startPoint).toBeFalsy()
-  })
-
   it('getCheckoutInfo refs/heads/', async () => {
     const checkoutInfo = await refHelper.getCheckoutInfo(
       git,
@@ -162,22 +152,7 @@ describe('ref-helper tests', () => {
   it('getRefSpec sha + refs/tags/', async () => {
     const refSpec = refHelper.getRefSpec('refs/tags/my-tag', commit)
     expect(refSpec.length).toBe(1)
-    expect(refSpec[0]).toBe(`+refs/tags/my-tag:refs/tags/my-tag`)
-  })
-
-  it('getRefSpec sha + refs/tags/ with fetchTags', async () => {
-    // When fetchTags is true, only include tags wildcard (specific tag is redundant)
-    const refSpec = refHelper.getRefSpec('refs/tags/my-tag', commit, true)
-    expect(refSpec.length).toBe(1)
-    expect(refSpec[0]).toBe('+refs/tags/*:refs/tags/*')
-  })
-
-  it('getRefSpec sha + refs/heads/ with fetchTags', async () => {
-    // When fetchTags is true, include both the branch refspec and tags wildcard
-    const refSpec = refHelper.getRefSpec('refs/heads/my/branch', commit, true)
-    expect(refSpec.length).toBe(2)
-    expect(refSpec[0]).toBe('+refs/tags/*:refs/tags/*')
-    expect(refSpec[1]).toBe(`+${commit}:refs/remotes/origin/my/branch`)
+    expect(refSpec[0]).toBe(`+${commit}:refs/tags/my-tag`)
   })
 
   it('getRefSpec sha only', async () => {
@@ -193,14 +168,6 @@ describe('ref-helper tests', () => {
     expect(refSpec[1]).toBe('+refs/tags/my-ref*:refs/tags/my-ref*')
   })
 
-  it('getRefSpec unqualified ref only with fetchTags', async () => {
-    // When fetchTags is true, skip specific tag pattern since wildcard covers all
-    const refSpec = refHelper.getRefSpec('my-ref', '', true)
-    expect(refSpec.length).toBe(2)
-    expect(refSpec[0]).toBe('+refs/tags/*:refs/tags/*')
-    expect(refSpec[1]).toBe('+refs/heads/my-ref*:refs/remotes/origin/my-ref*')
-  })
-
   it('getRefSpec refs/heads/ only', async () => {
     const refSpec = refHelper.getRefSpec('refs/heads/my/branch', '')
     expect(refSpec.length).toBe(1)
@@ -220,159 +187,4 @@ describe('ref-helper tests', () => {
     expect(refSpec.length).toBe(1)
     expect(refSpec[0]).toBe('+refs/tags/my-tag:refs/tags/my-tag')
   })
-
-  it('getRefSpec refs/tags/ only with fetchTags', async () => {
-    // When fetchTags is true, only include tags wildcard (specific tag is redundant)
-    const refSpec = refHelper.getRefSpec('refs/tags/my-tag', '', true)
-    expect(refSpec.length).toBe(1)
-    expect(refSpec[0]).toBe('+refs/tags/*:refs/tags/*')
-  })
-
-  it('getRefSpec refs/heads/ only with fetchTags', async () => {
-    // When fetchTags is true, include both the branch refspec and tags wildcard
-    const refSpec = refHelper.getRefSpec('refs/heads/my/branch', '', true)
-    expect(refSpec.length).toBe(2)
-    expect(refSpec[0]).toBe('+refs/tags/*:refs/tags/*')
-    expect(refSpec[1]).toBe(
-      '+refs/heads/my/branch:refs/remotes/origin/my/branch'
-    )
-  })
-
-  describe('checkCommitInfo', () => {
-    const repositoryOwner = 'some-owner'
-    const repositoryName = 'some-repo'
-    const ref = 'refs/pull/123/merge'
-    const sha1Head = '1111111111222222222233333333334444444444'
-    const sha1Base = 'aaaaaaaaaabbbbbbbbbbccccccccccdddddddddd'
-    const sha256Head =
-      '1111111111222222222233333333334444444444555555555566666666667777'
-    const sha256Base =
-      'aaaaaaaaaabbbbbbbbbbccccccccccddddddddddeeeeeeeeeeffffffffff0000'
-    let debugSpy: jest.SpyInstance
-    let getOctokitSpy: jest.SpyInstance
-    let repoGetSpy: jest.Mock
-    let originalEventName: string
-    let originalPayload: unknown
-    let originalRef: string
-    let originalSha: string
-
-    function setPullRequestContext(
-      expectedHeadSha: string,
-      expectedBaseSha: string,
-      mergeCommit: string
-    ): void {
-      ;(github.context as any).eventName = 'pull_request'
-      github.context.ref = ref
-      github.context.sha = mergeCommit
-      ;(github.context as any).payload = {
-        action: 'synchronize',
-        after: expectedHeadSha,
-        number: 123,
-        pull_request: {
-          base: {
-            sha: expectedBaseSha
-          }
-        },
-        repository: {
-          private: false
-        }
-      }
-    }
-
-    beforeEach(() => {
-      originalEventName = github.context.eventName
-      originalPayload = github.context.payload
-      originalRef = github.context.ref
-      originalSha = github.context.sha
-
-      jest.spyOn(github.context, 'repo', 'get').mockReturnValue({
-        owner: repositoryOwner,
-        repo: repositoryName
-      })
-      debugSpy = jest.spyOn(core, 'debug').mockImplementation(jest.fn())
-      repoGetSpy = jest.fn(async () => ({}))
-      getOctokitSpy = jest.spyOn(github, 'getOctokit').mockReturnValue({
-        rest: {
-          repos: {
-            get: repoGetSpy
-          }
-        }
-      } as any)
-    })
-
-    afterEach(() => {
-      ;(github.context as any).eventName = originalEventName
-      ;(github.context as any).payload = originalPayload
-      github.context.ref = originalRef
-      github.context.sha = originalSha
-      jest.restoreAllMocks()
-    })
-
-    it('returns early for SHA-1 merge commit', async () => {
-      setPullRequestContext(sha1Head, sha1Base, commit)
-
-      await refHelper.checkCommitInfo(
-        'token',
-        `Merge ${sha1Head} into ${sha1Base}`,
-        repositoryOwner,
-        repositoryName,
-        ref,
-        commit
-      )
-
-      expect(getOctokitSpy).not.toHaveBeenCalled()
-      expect(repoGetSpy).not.toHaveBeenCalled()
-    })
-
-    it('matches SHA-256 merge commit info', async () => {
-      const actualHeadSha =
-        '9999999999888888888877777777776666666666555555555544444444443333'
-      setPullRequestContext(sha256Head, sha256Base, sha256Commit)
-
-      await refHelper.checkCommitInfo(
-        'token',
-        `Merge ${actualHeadSha} into ${sha256Base}`,
-        repositoryOwner,
-        repositoryName,
-        ref,
-        sha256Commit
-      )
-
-      expect(getOctokitSpy).toHaveBeenCalledWith(
-        'token',
-        expect.objectContaining({
-          userAgent: expect.stringContaining(
-            `expected_head_sha=${sha256Head};actual_head_sha=${actualHeadSha}`
-          )
-        })
-      )
-      expect(repoGetSpy).toHaveBeenCalledWith({
-        owner: repositoryOwner,
-        repo: repositoryName
-      })
-      expect(debugSpy).toHaveBeenCalledWith(
-        `Expected head sha ${sha256Head}; actual head sha ${actualHeadSha}`
-      )
-      expect(debugSpy).not.toHaveBeenCalledWith('Unexpected message format')
-    })
-
-    it('does not match 50-char hex as a valid merge', async () => {
-      const invalidHeadSha =
-        '99999999998888888888777777777766666666665555555555'
-      setPullRequestContext(sha1Head, sha1Base, commit)
-
-      await refHelper.checkCommitInfo(
-        'token',
-        `Merge ${invalidHeadSha} into ${sha1Base}`,
-        repositoryOwner,
-        repositoryName,
-        ref,
-        commit
-      )
-
-      expect(getOctokitSpy).not.toHaveBeenCalled()
-      expect(repoGetSpy).not.toHaveBeenCalled()
-      expect(debugSpy).toHaveBeenCalledWith('Unexpected message format')
-    })
-  })
 })

__test__/unsafe-pr-checkout-helper.test.ts

@@ -1,267 +0,0 @@
-import * as github from '@actions/github'
-import {assertSafePrCheckout} from '../lib/unsafe-pr-checkout-helper'
-
-// Shallow clone original @actions/github context
-const originalContext = {...github.context}
-const originalEventName = github.context.eventName
-const originalPayload = github.context.payload
-
-const BASE_REPO_ID = 100
-const FORK_REPO_ID = 200
-const PR_HEAD_SHA = '1111111111111111111111111111111111111111'
-const PR_MERGE_SHA = '2222222222222222222222222222222222222222'
-const SAFE_BASE_SHA = '3333333333333333333333333333333333333333'
-const WORKFLOW_RUN_HEAD_COMMIT_SHA = '4444444444444444444444444444444444444444'
-const BASE_QUALIFIED_REPO = 'some-owner/some-repo'
-const FORK_QUALIFIED_REPO = 'another-repo/fork'
-
-function setContext(eventName: string, payload: object): void {
-  ;(github.context as {eventName: string}).eventName = eventName
-  ;(github.context as {payload: object}).payload = payload
-}
-
-function forkPullRequestTargetPayload(): object {
-  return {
-    repository: {id: BASE_REPO_ID},
-    pull_request: {
-      head: {
-        sha: PR_HEAD_SHA,
-        repo: {id: FORK_REPO_ID, full_name: FORK_QUALIFIED_REPO}
-      },
-      merge_commit_sha: PR_MERGE_SHA
-    }
-  }
-}
-
-function sameRepoPullRequestTargetPayload(): object {
-  return {
-    repository: {id: BASE_REPO_ID},
-    pull_request: {
-      head: {
-        sha: PR_HEAD_SHA,
-        repo: {id: BASE_REPO_ID, full_name: BASE_QUALIFIED_REPO}
-      },
-      merge_commit_sha: PR_MERGE_SHA
-    }
-  }
-}
-
-function forkWorkflowRunPayload(): object {
-  return {
-    repository: {id: BASE_REPO_ID},
-    workflow_run: {
-      event: 'pull_request',
-      head_commit: {id: WORKFLOW_RUN_HEAD_COMMIT_SHA},
-      head_repository: {id: FORK_REPO_ID, full_name: FORK_QUALIFIED_REPO}
-    }
-  }
-}
-
-describe('unsafe-pr-checkout-helper', () => {
-  beforeAll(() => {
-    jest.spyOn(github.context, 'repo', 'get').mockReturnValue({
-      owner: 'some-owner',
-      repo: 'some-repo'
-    })
-  })
-
-  afterEach(() => {
-    ;(github.context as {eventName: string}).eventName = originalEventName
-    ;(github.context as {payload: object}).payload = originalPayload
-  })
-
-  afterAll(() => {
-    ;(github.context as {eventName: string}).eventName =
-      originalContext.eventName
-    ;(github.context as {payload: object}).payload = originalContext.payload
-    jest.restoreAllMocks()
-  })
-
-  it('allows pull_request events untouched', () => {
-    setContext('pull_request', forkPullRequestTargetPayload())
-    expect(() =>
-      assertSafePrCheckout({
-        qualifiedRepository: 'attacker/fork',
-        ref: 'refs/pull/1/merge',
-        commit: '',
-        allowUnsafePrCheckout: false
-      })
-    ).not.toThrow()
-  })
-
-  it('allows pull_request_target default checkout (base branch)', () => {
-    setContext('pull_request_target', forkPullRequestTargetPayload())
-    expect(() =>
-      assertSafePrCheckout({
-        qualifiedRepository: BASE_QUALIFIED_REPO,
-        ref: 'refs/heads/main',
-        commit: SAFE_BASE_SHA,
-        allowUnsafePrCheckout: false
-      })
-    ).not.toThrow()
-  })
-
-  it('allows same-repo pull_request_target checkout of PR head', () => {
-    setContext('pull_request_target', sameRepoPullRequestTargetPayload())
-    expect(() =>
-      assertSafePrCheckout({
-        qualifiedRepository: BASE_QUALIFIED_REPO,
-        ref: '',
-        commit: PR_HEAD_SHA,
-        allowUnsafePrCheckout: false
-      })
-    ).not.toThrow()
-  })
-
-  it('refuses pull_request_target fork PR head SHA checkout', () => {
-    setContext('pull_request_target', forkPullRequestTargetPayload())
-    expect(() =>
-      assertSafePrCheckout({
-        qualifiedRepository: BASE_QUALIFIED_REPO,
-        ref: '',
-        commit: PR_HEAD_SHA,
-        allowUnsafePrCheckout: false
-      })
-    ).toThrow(/Refusing to check out fork pull request code/)
-  })
-
-  it('refuses pull_request_target fork PR merge_commit_sha checkout', () => {
-    setContext('pull_request_target', forkPullRequestTargetPayload())
-    expect(() =>
-      assertSafePrCheckout({
-        qualifiedRepository: BASE_QUALIFIED_REPO,
-        ref: '',
-        commit: PR_MERGE_SHA,
-        allowUnsafePrCheckout: false
-      })
-    ).toThrow(/allow-unsafe-pr-checkout/)
-  })
-
-  it('refuses pull_request_target fork PR ref pattern (head)', () => {
-    setContext('pull_request_target', forkPullRequestTargetPayload())
-    expect(() =>
-      assertSafePrCheckout({
-        qualifiedRepository: BASE_QUALIFIED_REPO,
-        ref: 'refs/pull/42/head',
-        commit: '',
-        allowUnsafePrCheckout: false
-      })
-    ).toThrow()
-  })
-
-  it('refuses pull_request_target fork PR ref pattern (merge)', () => {
-    setContext('pull_request_target', forkPullRequestTargetPayload())
-    expect(() =>
-      assertSafePrCheckout({
-        qualifiedRepository: BASE_QUALIFIED_REPO,
-        ref: 'refs/pull/42/merge',
-        commit: '',
-        allowUnsafePrCheckout: false
-      })
-    ).toThrow()
-  })
-
-  it('refuses pull_request_target when repository points at the fork', () => {
-    setContext('pull_request_target', forkPullRequestTargetPayload())
-    expect(() =>
-      assertSafePrCheckout({
-        qualifiedRepository: FORK_QUALIFIED_REPO,
-        ref: 'refs/heads/main',
-        commit: '',
-        allowUnsafePrCheckout: false
-      })
-    ).toThrow()
-  })
-
-  it('allows pull_request_target checkout of an unrelated third-party repo', () => {
-    setContext('pull_request_target', forkPullRequestTargetPayload())
-    expect(() =>
-      assertSafePrCheckout({
-        qualifiedRepository: 'some-other/unrelated',
-        ref: 'refs/heads/main',
-        commit: '',
-        allowUnsafePrCheckout: false
-      })
-    ).not.toThrow()
-  })
-
-  it('refuses pull_request_target ignoring repository case differences', () => {
-    setContext('pull_request_target', forkPullRequestTargetPayload())
-    expect(() =>
-      assertSafePrCheckout({
-        qualifiedRepository: FORK_QUALIFIED_REPO.toUpperCase(),
-        ref: '',
-        commit: '',
-        allowUnsafePrCheckout: false
-      })
-    ).toThrow()
-  })
-
-  it('refuses pull_request_target ignoring commit SHA case differences', () => {
-    setContext('pull_request_target', forkPullRequestTargetPayload())
-    expect(() =>
-      assertSafePrCheckout({
-        qualifiedRepository: BASE_QUALIFIED_REPO,
-        ref: '',
-        commit: PR_HEAD_SHA.toUpperCase(),
-        allowUnsafePrCheckout: false
-      })
-    ).toThrow()
-  })
-
-  it('allows pull_request_target fork PR checkout when opted in', () => {
-    setContext('pull_request_target', forkPullRequestTargetPayload())
-    expect(() =>
-      assertSafePrCheckout({
-        qualifiedRepository: BASE_QUALIFIED_REPO,
-        ref: 'refs/pull/42/merge',
-        commit: '',
-        allowUnsafePrCheckout: true
-      })
-    ).not.toThrow()
-  })
-
-  it('refuses workflow_run fork PR head_commit.id checkout', () => {
-    setContext('workflow_run', forkWorkflowRunPayload())
-    expect(() =>
-      assertSafePrCheckout({
-        qualifiedRepository: BASE_QUALIFIED_REPO,
-        ref: '',
-        commit: WORKFLOW_RUN_HEAD_COMMIT_SHA,
-        allowUnsafePrCheckout: false
-      })
-    ).toThrow()
-  })
-
-  it('refuses workflow_run with pull_request_target underlying event', () => {
-    const payload = forkWorkflowRunPayload() as {
-      workflow_run: {event: string}
-    }
-    payload.workflow_run.event = 'pull_request_target'
-    setContext('workflow_run', payload)
-    expect(() =>
-      assertSafePrCheckout({
-        qualifiedRepository: BASE_QUALIFIED_REPO,
-        ref: '',
-        commit: WORKFLOW_RUN_HEAD_COMMIT_SHA,
-        allowUnsafePrCheckout: false
-      })
-    ).toThrow()
-  })
-
-  it('allows workflow_run same-repo PR (head_repository.id matches base)', () => {
-    const payload = forkWorkflowRunPayload() as {
-      workflow_run: {head_repository: {id: number}}
-    }
-    payload.workflow_run.head_repository.id = BASE_REPO_ID
-    setContext('workflow_run', payload)
-    expect(() =>
-      assertSafePrCheckout({
-        qualifiedRepository: BASE_QUALIFIED_REPO,
-        ref: '',
-        commit: WORKFLOW_RUN_HEAD_COMMIT_SHA,
-        allowUnsafePrCheckout: false
-      })
-    ).not.toThrow()
-  })
-})

__test__/verify-fetch-tags.sh

@@ -1,9 +0,0 @@
-#!/bin/sh
-
-# Verify tags were fetched
-TAG_COUNT=$(git -C ./fetch-tags-test tag | wc -l)
-if [ "$TAG_COUNT" -eq 0 ]; then
-    echo "Expected tags to be fetched, but found none"
-    exit 1
-fi
-echo "Found $TAG_COUNT tags"

action.yml

@@ -98,15 +98,6 @@ 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
-  allow-unsafe-pr-checkout:
-    description: >
-      Required to check out fork pull request code from a workflow triggered by
-      `pull_request_target` or `workflow_run`. These workflows run with the
-      base repository's GITHUB_TOKEN, secrets, default-branch cache scope, and
-      runner access; fetching and executing a fork's code in that trusted
-      context commonly leads to "pwn request" vulnerabilities. Set to `true`
-      only after reviewing the risks at https://gh.io/securely-using-pull_request_target.
-    default: false
 outputs:
   ref:
     description: 'The branch, tag or SHA that was checked out'

dist/index.js

@@ -653,6 +653,7 @@ const fs = __importStar(__nccwpck_require__(7147));
 const fshelper = __importStar(__nccwpck_require__(7219));
 const io = __importStar(__nccwpck_require__(7436));
 const path = __importStar(__nccwpck_require__(1017));
+const refHelper = __importStar(__nccwpck_require__(8601));
 const regexpHelper = __importStar(__nccwpck_require__(3120));
 const retryHelper = __importStar(__nccwpck_require__(2155));
 const git_version_1 = __nccwpck_require__(3142);
@@ -830,9 +831,9 @@ class GitCommandManager {
     fetch(refSpec, options) {
         return __awaiter(this, void 0, void 0, function* () {
             const args = ['-c', 'protocol.version=2', 'fetch'];
-            // Always use --no-tags for explicit control over tag fetching
-            // Tags are fetched explicitly via refspec when needed
-            args.push('--no-tags');
+            if (!refSpec.some(x => x === refHelper.tagsRefSpec) && !options.fetchTags) {
+                args.push('--no-tags');
+            }
             args.push('--prune', '--no-recurse-submodules');
             if (options.showProgress) {
                 args.push('--progress');
@@ -896,14 +897,9 @@ class GitCommandManager {
     getWorkingDirectory() {
         return this.workingDirectory;
     }
-    init(objectFormat) {
+    init() {
         return __awaiter(this, void 0, void 0, function* () {
-            const args = ['init'];
-            if (objectFormat === 'sha256') {
-                args.push('--object-format=sha256');
-            }
-            args.push(this.workingDirectory);
-            yield this.execGit(args);
+            yield this.execGit(['init', this.workingDirectory]);
         });
     }
     isDetached() {
@@ -1210,17 +1206,7 @@ class GitCommandManager {
                 }
             }
             // Set the user agent
-            let gitHttpUserAgent = `git/${this.gitVersion} (github-actions-checkout)`;
-            // Append orchestration ID if set
-            const orchId = process.env['ACTIONS_ORCHESTRATION_ID'];
-            if (orchId) {
-                // Sanitize the orchestration ID to ensure it contains only valid characters
-                // Valid characters: 0-9, a-z, _, -, .
-                const sanitizedId = orchId.replace(/[^a-z0-9_.-]/gi, '_');
-                if (sanitizedId) {
-                    gitHttpUserAgent = `${gitHttpUserAgent} actions_orchestration_id/${sanitizedId}`;
-                }
-            }
+            const gitHttpUserAgent = `git/${this.gitVersion} (github-actions-checkout)`;
             core.debug(`Set git useragent to: ${gitHttpUserAgent}`);
             this.gitEnv['GIT_HTTP_USER_AGENT'] = gitHttpUserAgent;
         });
@@ -1491,17 +1477,8 @@ function getSource(settings) {
             stateHelper.setRepositoryPath(settings.repositoryPath);
             // Initialize the repository
             if (!fsHelper.directoryExistsSync(path.join(settings.repositoryPath, '.git'))) {
-                core.startGroup('Determining repository object format');
-                const objectFormatResult = yield githubApiHelper.tryGetRepositoryObjectFormat(settings.authToken, settings.repositoryOwner, settings.repositoryName, settings.githubServerUrl, settings.commit);
-                const objectFormat = objectFormatResult.succeeded
-                    ? objectFormatResult.format
-                    : '';
-                if (objectFormat === 'sha256') {
-                    core.info('Detected SHA-256 repository object format');
-                }
-                core.endGroup();
                 core.startGroup('Initializing the repository');
-                yield git.init(objectFormat);
+                yield git.init();
                 yield git.remoteAdd('origin', repositoryUrl);
                 core.endGroup();
             }
@@ -1552,26 +1529,13 @@ function getSource(settings) {
                 if (!(yield refHelper.testRef(git, settings.ref, settings.commit))) {
                     refSpec = refHelper.getRefSpec(settings.ref, settings.commit);
                     yield git.fetch(refSpec, fetchOptions);
-                    // Verify the ref now matches. For branches, the targeted fetch above brings
-                    // in the specific commit. For tags (fetched by ref), this will fail if
-                    // the tag was moved after the workflow was triggered.
-                    if (!(yield refHelper.testRef(git, settings.ref, settings.commit))) {
-                        throw new Error(`The ref '${settings.ref}' does not point to the expected commit '${settings.commit}'. ` +
-                            `The ref may have been updated after the workflow was triggered.`);
-                    }
                 }
             }
             else {
                 fetchOptions.fetchDepth = settings.fetchDepth;
-                const refSpec = refHelper.getRefSpec(settings.ref, settings.commit, settings.fetchTags);
+                fetchOptions.fetchTags = settings.fetchTags;
+                const refSpec = refHelper.getRefSpec(settings.ref, settings.commit);
                 yield git.fetch(refSpec, fetchOptions);
-                // For tags, verify the ref still points to the expected commit.
-                // Tags are fetched by ref (not commit), so if a tag was moved after the
-                // workflow was triggered, we would silently check out the wrong commit.
-                if (!(yield refHelper.testRef(git, settings.ref, settings.commit))) {
-                    throw new Error(`The ref '${settings.ref}' does not point to the expected commit '${settings.commit}'. ` +
-                        `The ref may have been updated after the workflow was triggered.`);
-                }
             }
             core.endGroup();
             // Checkout info
@@ -1824,7 +1788,6 @@ var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, ge
 Object.defineProperty(exports, "__esModule", ({ value: true }));
 exports.downloadRepository = downloadRepository;
 exports.getDefaultBranch = getDefaultBranch;
-exports.tryGetRepositoryObjectFormat = tryGetRepositoryObjectFormat;
 const assert = __importStar(__nccwpck_require__(9491));
 const core = __importStar(__nccwpck_require__(2186));
 const fs = __importStar(__nccwpck_require__(7147));
@@ -1926,40 +1889,6 @@ function getDefaultBranch(authToken, owner, repo, baseUrl) {
         }));
     });
 }
-function tryGetRepositoryObjectFormat(authToken, owner, repo, baseUrl, commit) {
-    return __awaiter(this, void 0, void 0, function* () {
-        var _a;
-        const commitFormat = getObjectFormat(commit);
-        if (commitFormat) {
-            return { format: commitFormat, succeeded: true };
-        }
-        try {
-            const octokit = github.getOctokit(authToken, {
-                baseUrl: (0, url_helper_1.getServerApiUrl)(baseUrl)
-            });
-            const response = yield octokit.request('GET /repos/{owner}/{repo}/hash-algorithm', { owner, repo });
-            const hashAlgorithm = response.data.hash_algorithm;
-            if (hashAlgorithm === 'sha256' || hashAlgorithm === 'sha1') {
-                return { format: hashAlgorithm, succeeded: true };
-            }
-            core.debug('Unable to determine repository object format from hash-algorithm endpoint');
-            return { format: '', succeeded: false };
-        }
-        catch (err) {
-            core.debug(`Unable to determine repository object format from hash-algorithm endpoint: ${(_a = err === null || err === void 0 ? void 0 : err.message) !== null && _a !== void 0 ? _a : err}`);
-            return { format: '', succeeded: false };
-        }
-    });
-}
-function getObjectFormat(sha) {
-    if (/^[0-9a-fA-F]{64}$/.test(sha || '')) {
-        return 'sha256';
-    }
-    if (/^[0-9a-fA-F]{40}$/.test(sha || '')) {
-        return 'sha1';
-    }
-    return '';
-}
 function downloadArchive(authToken, owner, repo, ref, commit, baseUrl) {
     return __awaiter(this, void 0, void 0, function* () {
         const octokit = github.getOctokit(authToken, {
@@ -2023,7 +1952,6 @@ const core = __importStar(__nccwpck_require__(2186));
 const fsHelper = __importStar(__nccwpck_require__(7219));
 const github = __importStar(__nccwpck_require__(5438));
 const path = __importStar(__nccwpck_require__(1017));
-const unsafePrCheckoutHelper = __importStar(__nccwpck_require__(843));
 const workflowContextHelper = __importStar(__nccwpck_require__(9568));
 function getInputs() {
     return __awaiter(this, void 0, void 0, function* () {
@@ -2071,7 +1999,7 @@ function getInputs() {
             }
         }
         // SHA?
-        else if (result.ref.match(/^(?:[0-9a-fA-F]{40}|[0-9a-fA-F]{64})$/)) {
+        else if (result.ref.match(/^[0-9a-fA-F]{40}$/)) {
             result.commit = result.ref;
             result.ref = '';
         }
@@ -2145,17 +2073,6 @@ function getInputs() {
         // Determine the GitHub URL that the repository is being hosted from
         result.githubServerUrl = core.getInput('github-server-url');
         core.debug(`GitHub Host URL = ${result.githubServerUrl}`);
-        // Allow unsafe PR checkout (opt-in for pull_request_target / workflow_run fork PRs)
-        result.allowUnsafePrCheckout =
-            (core.getInput('allow-unsafe-pr-checkout') || 'false').toUpperCase() ===
-                'TRUE';
-        core.debug(`allow unsafe PR checkout = ${result.allowUnsafePrCheckout}`);
-        unsafePrCheckoutHelper.assertSafePrCheckout({
-            qualifiedRepository,
-            ref: result.ref,
-            commit: result.commit,
-            allowUnsafePrCheckout: result.allowUnsafePrCheckout
-        });
         return result;
     });
 }
@@ -2296,7 +2213,6 @@ exports.getRefSpecForAllHistory = getRefSpecForAllHistory;
 exports.getRefSpec = getRefSpec;
 exports.testRef = testRef;
 exports.checkCommitInfo = checkCommitInfo;
-exports.fromPayload = fromPayload;
 const core = __importStar(__nccwpck_require__(2186));
 const github = __importStar(__nccwpck_require__(5438));
 const url_helper_1 = __nccwpck_require__(9437);
@@ -2358,67 +2274,53 @@ function getRefSpecForAllHistory(ref, commit) {
     }
     return result;
 }
-function getRefSpec(ref, commit, fetchTags) {
+function getRefSpec(ref, commit) {
     if (!ref && !commit) {
         throw new Error('Args ref and commit cannot both be empty');
     }
     const upperRef = (ref || '').toUpperCase();
-    const result = [];
-    // When fetchTags is true, always include the tags refspec
-    if (fetchTags) {
-        result.push(exports.tagsRefSpec);
-    }
     // SHA
     if (commit) {
         // refs/heads
         if (upperRef.startsWith('REFS/HEADS/')) {
             const branch = ref.substring('refs/heads/'.length);
-            result.push(`+${commit}:refs/remotes/origin/${branch}`);
+            return [`+${commit}:refs/remotes/origin/${branch}`];
         }
         // refs/pull/
         else if (upperRef.startsWith('REFS/PULL/')) {
             const branch = ref.substring('refs/pull/'.length);
-            result.push(`+${commit}:refs/remotes/pull/${branch}`);
+            return [`+${commit}:refs/remotes/pull/${branch}`];
         }
         // refs/tags/
         else if (upperRef.startsWith('REFS/TAGS/')) {
-            if (!fetchTags) {
-                result.push(`+${ref}:${ref}`);
-            }
+            return [`+${commit}:${ref}`];
         }
         // Otherwise no destination ref
         else {
-            result.push(commit);
+            return [commit];
         }
     }
     // Unqualified ref, check for a matching branch or tag
     else if (!upperRef.startsWith('REFS/')) {
-        result.push(`+refs/heads/${ref}*:refs/remotes/origin/${ref}*`);
-        if (!fetchTags) {
-            result.push(`+refs/tags/${ref}*:refs/tags/${ref}*`);
-        }
+        return [
+            `+refs/heads/${ref}*:refs/remotes/origin/${ref}*`,
+            `+refs/tags/${ref}*:refs/tags/${ref}*`
+        ];
     }
     // refs/heads/
     else if (upperRef.startsWith('REFS/HEADS/')) {
         const branch = ref.substring('refs/heads/'.length);
-        result.push(`+${ref}:refs/remotes/origin/${branch}`);
+        return [`+${ref}:refs/remotes/origin/${branch}`];
     }
     // refs/pull/
     else if (upperRef.startsWith('REFS/PULL/')) {
         const branch = ref.substring('refs/pull/'.length);
-        result.push(`+${ref}:refs/remotes/pull/${branch}`);
+        return [`+${ref}:refs/remotes/pull/${branch}`];
     }
     // refs/tags/
-    else if (upperRef.startsWith('REFS/TAGS/')) {
-        if (!fetchTags) {
-            result.push(`+${ref}:${ref}`);
-        }
-    }
-    // Other refs
     else {
-        result.push(`+${ref}:${ref}`);
+        return [`+${ref}:${ref}`];
     }
-    return result;
 }
 /**
  * Tests whether the initial fetch created the ref at the expected commit
@@ -2454,9 +2356,7 @@ function testRef(git, ref, commit) {
         // refs/tags/
         else if (upperRef.startsWith('REFS/TAGS/')) {
             const tagName = ref.substring('refs/tags/'.length);
-            // Use ^{commit} to dereference annotated tags to their underlying commit
-            return ((yield git.tagExists(tagName)) &&
-                commit === (yield git.revParse(`${ref}^{commit}`)));
+            return ((yield git.tagExists(tagName)) && commit === (yield git.revParse(ref)));
         }
         // Unexpected
         else {
@@ -2506,7 +2406,7 @@ function checkCommitInfo(token, commitInfo, repositoryOwner, repositoryName, ref
                 return;
             }
             // Extract details from message
-            const match = commitInfo.match(/Merge ([0-9a-f]{40}|[0-9a-f]{64}) into ([0-9a-f]{40}|[0-9a-f]{64})/);
+            const match = commitInfo.match(/Merge ([0-9a-f]{40}) into ([0-9a-f]{40})/);
             if (!match) {
                 core.debug('Unexpected message format');
                 return;
@@ -2745,105 +2645,6 @@ if (!exports.IsPost) {
 }
 
 
-/***/ }),
-
-/***/ 843:
-/***/ (function(__unused_webpack_module, exports, __nccwpck_require__) {
-
-"use strict";
-
-var __createBinding = (this && this.__createBinding) || (Object.create ? (function(o, m, k, k2) {
-    if (k2 === undefined) k2 = k;
-    var desc = Object.getOwnPropertyDescriptor(m, k);
-    if (!desc || ("get" in desc ? !m.__esModule : desc.writable || desc.configurable)) {
-      desc = { enumerable: true, get: function() { return m[k]; } };
-    }
-    Object.defineProperty(o, k2, desc);
-}) : (function(o, m, k, k2) {
-    if (k2 === undefined) k2 = k;
-    o[k2] = m[k];
-}));
-var __setModuleDefault = (this && this.__setModuleDefault) || (Object.create ? (function(o, v) {
-    Object.defineProperty(o, "default", { enumerable: true, value: v });
-}) : function(o, v) {
-    o["default"] = v;
-});
-var __importStar = (this && this.__importStar) || function (mod) {
-    if (mod && mod.__esModule) return mod;
-    var result = {};
-    if (mod != null) for (var k in mod) if (k !== "default" && Object.prototype.hasOwnProperty.call(mod, k)) __createBinding(result, mod, k);
-    __setModuleDefault(result, mod);
-    return result;
-};
-Object.defineProperty(exports, "__esModule", ({ value: true }));
-exports.assertSafePrCheckout = assertSafePrCheckout;
-const github = __importStar(__nccwpck_require__(5438));
-const ref_helper_1 = __nccwpck_require__(8601);
-const PR_REF_PATTERN = /^refs\/pull\/[0-9]+\/(?:head|merge)$/;
-function assertSafePrCheckout(input) {
-    if (input.allowUnsafePrCheckout) {
-        return;
-    }
-    const eventName = github.context.eventName;
-    if (eventName !== 'pull_request_target' && eventName !== 'workflow_run') {
-        return;
-    }
-    const baseRepoId = (0, ref_helper_1.fromPayload)('repository.id');
-    if (typeof baseRepoId !== 'number') {
-        return;
-    }
-    let prHeadRepoId;
-    let prHeadRepoFullName;
-    const prShas = [];
-    if (eventName === 'pull_request_target') {
-        prHeadRepoId = (0, ref_helper_1.fromPayload)('pull_request.head.repo.id');
-        prHeadRepoFullName = (0, ref_helper_1.fromPayload)('pull_request.head.repo.full_name');
-        pushIfSha(prShas, (0, ref_helper_1.fromPayload)('pull_request.head.sha'));
-        pushIfSha(prShas, (0, ref_helper_1.fromPayload)('pull_request.merge_commit_sha'));
-    }
-    else {
-        const wrEvent = (0, ref_helper_1.fromPayload)('workflow_run.event');
-        if (typeof wrEvent !== 'string' || !wrEvent.startsWith('pull_request')) {
-            return;
-        }
-        prHeadRepoId = (0, ref_helper_1.fromPayload)('workflow_run.head_repository.id');
-        prHeadRepoFullName = (0, ref_helper_1.fromPayload)('workflow_run.head_repository.full_name');
-        pushIfSha(prShas, (0, ref_helper_1.fromPayload)('workflow_run.head_commit.id'));
-        // For `pull_request_target`-triggered workflow_run, `head_sha` is the base
-        // default branch SHA (not the PR head)
-        if (wrEvent !== 'pull_request_target') {
-            pushIfSha(prShas, (0, ref_helper_1.fromPayload)('workflow_run.head_sha'));
-        }
-    }
-    // (A) Fork PR?
-    if (typeof prHeadRepoId !== 'number' || prHeadRepoId === baseRepoId) {
-        return;
-    }
-    // (B) We cannot check for all fork PR refs so check to see
-    // if the resolved input points to the fork PR sha we have in the payload
-    const repositoryMatchesPrHead = typeof prHeadRepoFullName === 'string' &&
-        input.qualifiedRepository.toLowerCase() === prHeadRepoFullName.toLowerCase();
-    const refMatchesPullPattern = PR_REF_PATTERN.test(input.ref);
-    const commitMatchesPrHeadSha = !!input.commit && prShas.includes(input.commit.toLowerCase());
-    if (!repositoryMatchesPrHead &&
-        !refMatchesPullPattern &&
-        !commitMatchesPrHeadSha) {
-        return;
-    }
-    throw new Error(`Refusing to check out fork pull request code from a '${eventName}' workflow. ` +
-        `This workflow runs with the base repository's GITHUB_TOKEN, secrets, default-branch ` +
-        `cache scope, and runner access. Fetching and executing a fork's code in that trusted ` +
-        `context commonly leads to "pwn request" vulnerabilities. To opt in, review the risks ` +
-        `at https://gh.io/securely-using-pull_request_target and set 'allow-unsafe-pr-checkout: true' ` +
-        `on the actions/checkout step.`);
-}
-function pushIfSha(target, value) {
-    if (typeof value === 'string' && value.length > 0) {
-        target.push(value.toLowerCase());
-    }
-}
-
-
 /***/ }),
 
 /***/ 9437:

src/git-command-manager.ts

@@ -37,13 +37,14 @@ export interface IGitCommandManager {
     options: {
       filter?: string
       fetchDepth?: number
+      fetchTags?: boolean
       showProgress?: boolean
     }
   ): Promise<void>
   getDefaultBranch(repositoryUrl: string): Promise<string>
   getSubmoduleConfigPaths(recursive: boolean): Promise<string[]>
   getWorkingDirectory(): string
-  init(objectFormat?: string): Promise<void>
+  init(): Promise<void>
   isDetached(): Promise<boolean>
   lfsFetch(ref: string): Promise<void>
   lfsInstall(): Promise<void>
@@ -279,13 +280,14 @@ class GitCommandManager {
     options: {
       filter?: string
       fetchDepth?: number
+      fetchTags?: boolean
       showProgress?: boolean
     }
   ): Promise<void> {
     const args = ['-c', 'protocol.version=2', 'fetch']
-    // Always use --no-tags for explicit control over tag fetching
-    // Tags are fetched explicitly via refspec when needed
-    args.push('--no-tags')
+    if (!refSpec.some(x => x === refHelper.tagsRefSpec) && !options.fetchTags) {
+      args.push('--no-tags')
+    }
 
     args.push('--prune', '--no-recurse-submodules')
     if (options.showProgress) {
@@ -364,14 +366,8 @@ class GitCommandManager {
     return this.workingDirectory
   }
 
-  async init(objectFormat?: string): Promise<void> {
-    const args = ['init']
-    if (objectFormat === 'sha256') {
-      args.push('--object-format=sha256')
-    }
-    args.push(this.workingDirectory)
-
-    await this.execGit(args)
+  async init(): Promise<void> {
+    await this.execGit(['init', this.workingDirectory])
   }
 
   async isDetached(): Promise<boolean> {
@@ -734,19 +730,7 @@ class GitCommandManager {
       }
     }
     // Set the user agent
-    let gitHttpUserAgent = `git/${this.gitVersion} (github-actions-checkout)`
-
-    // Append orchestration ID if set
-    const orchId = process.env['ACTIONS_ORCHESTRATION_ID']
-    if (orchId) {
-      // Sanitize the orchestration ID to ensure it contains only valid characters
-      // Valid characters: 0-9, a-z, _, -, .
-      const sanitizedId = orchId.replace(/[^a-z0-9_.-]/gi, '_')
-      if (sanitizedId) {
-        gitHttpUserAgent = `${gitHttpUserAgent} actions_orchestration_id/${sanitizedId}`
-      }
-    }
-
+    const gitHttpUserAgent = `git/${this.gitVersion} (github-actions-checkout)`
     core.debug(`Set git useragent to: ${gitHttpUserAgent}`)
     this.gitEnv['GIT_HTTP_USER_AGENT'] = gitHttpUserAgent
   }

src/git-source-provider.ts

@@ -109,25 +109,8 @@ export async function getSource(settings: IGitSourceSettings): Promise<void> {
     if (
       !fsHelper.directoryExistsSync(path.join(settings.repositoryPath, '.git'))
     ) {
-      core.startGroup('Determining repository object format')
-      const objectFormatResult =
-        await githubApiHelper.tryGetRepositoryObjectFormat(
-          settings.authToken,
-          settings.repositoryOwner,
-          settings.repositoryName,
-          settings.githubServerUrl,
-          settings.commit
-        )
-      const objectFormat = objectFormatResult.succeeded
-        ? objectFormatResult.format
-        : ''
-      if (objectFormat === 'sha256') {
-        core.info('Detected SHA-256 repository object format')
-      }
-      core.endGroup()
-
       core.startGroup('Initializing the repository')
-      await git.init(objectFormat)
+      await git.init()
       await git.remoteAdd('origin', repositoryUrl)
       core.endGroup()
     }
@@ -176,6 +159,7 @@ export async function getSource(settings: IGitSourceSettings): Promise<void> {
     const fetchOptions: {
       filter?: string
       fetchDepth?: number
+      fetchTags?: boolean
       showProgress?: boolean
     } = {}
 
@@ -198,35 +182,12 @@ export async function getSource(settings: IGitSourceSettings): Promise<void> {
       if (!(await refHelper.testRef(git, settings.ref, settings.commit))) {
         refSpec = refHelper.getRefSpec(settings.ref, settings.commit)
         await git.fetch(refSpec, fetchOptions)
-
-        // Verify the ref now matches. For branches, the targeted fetch above brings
-        // in the specific commit. For tags (fetched by ref), this will fail if
-        // the tag was moved after the workflow was triggered.
-        if (!(await refHelper.testRef(git, settings.ref, settings.commit))) {
-          throw new Error(
-            `The ref '${settings.ref}' does not point to the expected commit '${settings.commit}'. ` +
-              `The ref may have been updated after the workflow was triggered.`
-          )
-        }
       }
     } else {
       fetchOptions.fetchDepth = settings.fetchDepth
-      const refSpec = refHelper.getRefSpec(
-        settings.ref,
-        settings.commit,
-        settings.fetchTags
-      )
+      fetchOptions.fetchTags = settings.fetchTags
+      const refSpec = refHelper.getRefSpec(settings.ref, settings.commit)
       await git.fetch(refSpec, fetchOptions)
-
-      // For tags, verify the ref still points to the expected commit.
-      // Tags are fetched by ref (not commit), so if a tag was moved after the
-      // workflow was triggered, we would silently check out the wrong commit.
-      if (!(await refHelper.testRef(git, settings.ref, settings.commit))) {
-        throw new Error(
-          `The ref '${settings.ref}' does not point to the expected commit '${settings.commit}'. ` +
-            `The ref may have been updated after the workflow was triggered.`
-        )
-      }
     }
     core.endGroup()
 

src/git-source-settings.ts

@@ -118,10 +118,4 @@ export interface IGitSourceSettings {
    * User override on the GitHub Server/Host URL that hosts the repository to be cloned
    */
   githubServerUrl: string | undefined
-
-  /**
-   * Opt-in to allow checking out fork pull request code from a workflow
-   * triggered by pull_request_target or workflow_run.
-   */
-  allowUnsafePrCheckout: boolean
 }

src/github-api-helper.ts

@@ -11,11 +11,6 @@ import {getServerApiUrl} from './url-helper'
 
 const IS_WINDOWS = process.platform === 'win32'
 
-export interface RepositoryObjectFormatResult {
-  format: string
-  succeeded: boolean
-}
-
 export async function downloadRepository(
   authToken: string,
   owner: string,
@@ -127,53 +122,6 @@ export async function getDefaultBranch(
   })
 }
 
-export async function tryGetRepositoryObjectFormat(
-  authToken: string,
-  owner: string,
-  repo: string,
-  baseUrl?: string,
-  commit?: string
-): Promise<RepositoryObjectFormatResult> {
-  const commitFormat = getObjectFormat(commit)
-  if (commitFormat) {
-    return {format: commitFormat, succeeded: true}
-  }
-
-  try {
-    const octokit = github.getOctokit(authToken, {
-      baseUrl: getServerApiUrl(baseUrl)
-    })
-    const response = await octokit.request(
-      'GET /repos/{owner}/{repo}/hash-algorithm',
-      {owner, repo}
-    )
-    const hashAlgorithm = response.data.hash_algorithm
-    if (hashAlgorithm === 'sha256' || hashAlgorithm === 'sha1') {
-      return {format: hashAlgorithm, succeeded: true}
-    }
-
-    core.debug(
-      'Unable to determine repository object format from hash-algorithm endpoint'
-    )
-    return {format: '', succeeded: false}
-  } catch (err) {
-    core.debug(
-      `Unable to determine repository object format from hash-algorithm endpoint: ${(err as any)?.message ?? err}`
-    )
-    return {format: '', succeeded: false}
-  }
-}
-
-function getObjectFormat(sha?: string): string {
-  if (/^[0-9a-fA-F]{64}$/.test(sha || '')) {
-    return 'sha256'
-  }
-  if (/^[0-9a-fA-F]{40}$/.test(sha || '')) {
-    return 'sha1'
-  }
-  return ''
-}
-
 async function downloadArchive(
   authToken: string,
   owner: string,

src/input-helper.ts

@@ -2,7 +2,6 @@ import * as core from '@actions/core'
 import * as fsHelper from './fs-helper'
 import * as github from '@actions/github'
 import * as path from 'path'
-import * as unsafePrCheckoutHelper from './unsafe-pr-checkout-helper'
 import * as workflowContextHelper from './workflow-context-helper'
 import {IGitSourceSettings} from './git-source-settings'
 
@@ -72,7 +71,7 @@ export async function getInputs(): Promise<IGitSourceSettings> {
     }
   }
   // SHA?
-  else if (result.ref.match(/^(?:[0-9a-fA-F]{40}|[0-9a-fA-F]{64})$/)) {
+  else if (result.ref.match(/^[0-9a-fA-F]{40}$/)) {
     result.commit = result.ref
     result.ref = ''
   }
@@ -162,18 +161,5 @@ export async function getInputs(): Promise<IGitSourceSettings> {
   result.githubServerUrl = core.getInput('github-server-url')
   core.debug(`GitHub Host URL = ${result.githubServerUrl}`)
 
-  // Allow unsafe PR checkout (opt-in for pull_request_target / workflow_run fork PRs)
-  result.allowUnsafePrCheckout =
-    (core.getInput('allow-unsafe-pr-checkout') || 'false').toUpperCase() ===
-    'TRUE'
-  core.debug(`allow unsafe PR checkout = ${result.allowUnsafePrCheckout}`)
-
-  unsafePrCheckoutHelper.assertSafePrCheckout({
-    qualifiedRepository,
-    ref: result.ref,
-    commit: result.commit,
-    allowUnsafePrCheckout: result.allowUnsafePrCheckout
-  })
-
   return result
 }

src/ref-helper.ts

@@ -76,75 +76,55 @@ export function getRefSpecForAllHistory(ref: string, commit: string): string[] {
   return result
 }
 
-export function getRefSpec(
-  ref: string,
-  commit: string,
-  fetchTags?: boolean
-): string[] {
+export function getRefSpec(ref: string, commit: string): string[] {
   if (!ref && !commit) {
     throw new Error('Args ref and commit cannot both be empty')
   }
 
   const upperRef = (ref || '').toUpperCase()
-  const result: string[] = []
-
-  // When fetchTags is true, always include the tags refspec
-  if (fetchTags) {
-    result.push(tagsRefSpec)
-  }
 
   // SHA
   if (commit) {
     // refs/heads
     if (upperRef.startsWith('REFS/HEADS/')) {
       const branch = ref.substring('refs/heads/'.length)
-      result.push(`+${commit}:refs/remotes/origin/${branch}`)
+      return [`+${commit}:refs/remotes/origin/${branch}`]
     }
     // refs/pull/
     else if (upperRef.startsWith('REFS/PULL/')) {
       const branch = ref.substring('refs/pull/'.length)
-      result.push(`+${commit}:refs/remotes/pull/${branch}`)
+      return [`+${commit}:refs/remotes/pull/${branch}`]
     }
     // refs/tags/
     else if (upperRef.startsWith('REFS/TAGS/')) {
-      if (!fetchTags) {
-        result.push(`+${ref}:${ref}`)
-      }
+      return [`+${commit}:${ref}`]
     }
     // Otherwise no destination ref
     else {
-      result.push(commit)
+      return [commit]
     }
   }
   // Unqualified ref, check for a matching branch or tag
   else if (!upperRef.startsWith('REFS/')) {
-    result.push(`+refs/heads/${ref}*:refs/remotes/origin/${ref}*`)
-    if (!fetchTags) {
-      result.push(`+refs/tags/${ref}*:refs/tags/${ref}*`)
-    }
+    return [
+      `+refs/heads/${ref}*:refs/remotes/origin/${ref}*`,
+      `+refs/tags/${ref}*:refs/tags/${ref}*`
+    ]
   }
   // refs/heads/
   else if (upperRef.startsWith('REFS/HEADS/')) {
     const branch = ref.substring('refs/heads/'.length)
-    result.push(`+${ref}:refs/remotes/origin/${branch}`)
+    return [`+${ref}:refs/remotes/origin/${branch}`]
   }
   // refs/pull/
   else if (upperRef.startsWith('REFS/PULL/')) {
     const branch = ref.substring('refs/pull/'.length)
-    result.push(`+${ref}:refs/remotes/pull/${branch}`)
+    return [`+${ref}:refs/remotes/pull/${branch}`]
   }
   // refs/tags/
-  else if (upperRef.startsWith('REFS/TAGS/')) {
-    if (!fetchTags) {
-      result.push(`+${ref}:${ref}`)
-    }
-  }
-  // Other refs
   else {
-    result.push(`+${ref}:${ref}`)
+    return [`+${ref}:${ref}`]
   }
-
-  return result
 }
 
 /**
@@ -190,10 +170,8 @@ export async function testRef(
   // refs/tags/
   else if (upperRef.startsWith('REFS/TAGS/')) {
     const tagName = ref.substring('refs/tags/'.length)
-    // Use ^{commit} to dereference annotated tags to their underlying commit
     return (
-      (await git.tagExists(tagName)) &&
-      commit === (await git.revParse(`${ref}^{commit}`))
+      (await git.tagExists(tagName)) && commit === (await git.revParse(ref))
     )
   }
   // Unexpected
@@ -258,9 +236,7 @@ export async function checkCommitInfo(
     }
 
     // Extract details from message
-    const match = commitInfo.match(
-      /Merge ([0-9a-f]{40}|[0-9a-f]{64}) into ([0-9a-f]{40}|[0-9a-f]{64})/
-    )
+    const match = commitInfo.match(/Merge ([0-9a-f]{40}) into ([0-9a-f]{40})/)
     if (!match) {
       core.debug('Unexpected message format')
       return
@@ -292,7 +268,7 @@ export async function checkCommitInfo(
   }
 }
 
-export function fromPayload(path: string): any {
+function fromPayload(path: string): any {
   return select(github.context.payload, path)
 }
 

src/unsafe-pr-checkout-helper.ts

@@ -1,88 +0,0 @@
-import * as github from '@actions/github'
-import {fromPayload} from './ref-helper'
-
-const PR_REF_PATTERN = /^refs\/pull\/[0-9]+\/(?:head|merge)$/
-
-export interface IUnsafePrCheckoutInput {
-  qualifiedRepository: string
-  ref: string
-  commit: string | undefined
-  allowUnsafePrCheckout: boolean
-}
-
-export function assertSafePrCheckout(input: IUnsafePrCheckoutInput): void {
-  if (input.allowUnsafePrCheckout) {
-    return
-  }
-
-  const eventName = github.context.eventName
-  if (eventName !== 'pull_request_target' && eventName !== 'workflow_run') {
-    return
-  }
-
-  const baseRepoId = fromPayload('repository.id')
-  if (typeof baseRepoId !== 'number') {
-    return
-  }
-
-  let prHeadRepoId: unknown
-  let prHeadRepoFullName: unknown
-  const prShas: string[] = []
-
-  if (eventName === 'pull_request_target') {
-    prHeadRepoId = fromPayload('pull_request.head.repo.id')
-    prHeadRepoFullName = fromPayload('pull_request.head.repo.full_name')
-    pushIfSha(prShas, fromPayload('pull_request.head.sha'))
-    pushIfSha(prShas, fromPayload('pull_request.merge_commit_sha'))
-  } else {
-    const wrEvent = fromPayload('workflow_run.event')
-    if (typeof wrEvent !== 'string' || !wrEvent.startsWith('pull_request')) {
-      return
-    }
-    prHeadRepoId = fromPayload('workflow_run.head_repository.id')
-    prHeadRepoFullName = fromPayload('workflow_run.head_repository.full_name')
-    pushIfSha(prShas, fromPayload('workflow_run.head_commit.id'))
-    // For `pull_request_target`-triggered workflow_run, `head_sha` is the base
-    // default branch SHA (not the PR head)
-    if (wrEvent !== 'pull_request_target') {
-      pushIfSha(prShas, fromPayload('workflow_run.head_sha'))
-    }
-  }
-
-  // (A) Fork PR?
-  if (typeof prHeadRepoId !== 'number' || prHeadRepoId === baseRepoId) {
-    return
-  }
-
-  // (B) We cannot check for all fork PR refs so check to see
-  // if the resolved input points to the fork PR sha we have in the payload
-  const repositoryMatchesPrHead =
-    typeof prHeadRepoFullName === 'string' &&
-    input.qualifiedRepository.toLowerCase() === prHeadRepoFullName.toLowerCase()
-  const refMatchesPullPattern = PR_REF_PATTERN.test(input.ref)
-  const commitMatchesPrHeadSha =
-    !!input.commit && prShas.includes(input.commit.toLowerCase())
-
-  if (
-    !repositoryMatchesPrHead &&
-    !refMatchesPullPattern &&
-    !commitMatchesPrHeadSha
-  ) {
-    return
-  }
-
-  throw new Error(
-    `Refusing to check out fork pull request code from a '${eventName}' workflow. ` +
-      `This workflow runs with the base repository's GITHUB_TOKEN, secrets, default-branch ` +
-      `cache scope, and runner access. Fetching and executing a fork's code in that trusted ` +
-      `context commonly leads to "pwn request" vulnerabilities. To opt in, review the risks ` +
-      `at https://gh.io/securely-using-pull_request_target and set 'allow-unsafe-pr-checkout: true' ` +
-      `on the actions/checkout step.`
-  )
-}
-
-function pushIfSha(target: string[], value: unknown): void {
-  if (typeof value === 'string' && value.length > 0) {
-    target.push(value.toLowerCase())
-  }
-}