Merge 14150cf66c into 0c366fd6a8

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

CHANGELOG.md

@@ -1,9 +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
 

LICENSE

@@ -1,22 +1,201 @@
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__test__/git-command-manager.test.ts

@@ -378,59 +378,6 @@ describe('Test fetchDepth and fetchTags options', () => {
   })
 })
 
-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())

__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

@@ -133,16 +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,
@@ -237,142 +227,4 @@ describe('ref-helper tests', () => {
       '+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')
-    })
-  })
 })

dist/index.js

@@ -896,14 +896,9 @@ class GitCommandManager {
     getWorkingDirectory() {
         return this.workingDirectory;
     }
-    init(objectFormat) {
+    init() {
         return __awaiter(this, void 0, void 0, function* () {
-            const args = ['init'];
+            yield this.execGit(['init', this.workingDirectory]);
-            if (objectFormat === 'sha256') {
-                args.push('--object-format=sha256');
-            }
-            args.push(this.workingDirectory);
-            yield this.execGit(args);
         });
     }
     isDetached() {
@@ -1491,17 +1486,8 @@ 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();
             }
@@ -1824,7 +1810,6 @@ 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 +1911,6 @@ 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}$/.test(sha || '')) {
-        return 'sha1';
-    }
-    return '';
-}
 function downloadArchive(authToken, owner, repo, ref, commit, baseUrl) {
     return __awaiter(this, void 0, void 0, function* () {
         const octokit = github.getOctokit(authToken, {
@@ -2070,7 +2021,7 @@ function getInputs() {
             }
         }
         // SHA?
-        else if (result.ref.match(/^(?:[0-9a-fA-F]{40}|[0-9a-fA-F]{64})$/)) {
+        else if (result.ref.match(/^[0-9a-fA-F]{40}$/)) {
             result.commit = result.ref;
             result.ref = '';
         }
@@ -2493,7 +2444,7 @@ 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;

src/git-command-manager.ts

@@ -43,7 +43,7 @@ export interface IGitCommandManager {
   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>
@@ -364,14 +364,8 @@ class GitCommandManager {
     return this.workingDirectory
   }
 
-  async init(objectFormat?: string): Promise<void> {
+  async init(): Promise<void> {
-    const args = ['init']
+    await this.execGit(['init', this.workingDirectory])
-    if (objectFormat === 'sha256') {
-      args.push('--object-format=sha256')
-    }
-    args.push(this.workingDirectory)
-
-    await this.execGit(args)
   }
 
   async isDetached(): Promise<boolean> {

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()
     }

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

@@ -71,7 +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 = ''
   }

src/ref-helper.ts

@@ -258,9 +258,7 @@ export async function checkCommitInfo(
     }
 
     // Extract details from message
-    const match = commitInfo.match(
+    const match = commitInfo.match(/Merge ([0-9a-f]{40}) into ([0-9a-f]{40})/)
-      /Merge ([0-9a-f]{40}|[0-9a-f]{64}) into ([0-9a-f]{40}|[0-9a-f]{64})/
-    )
     if (!match) {
       core.debug('Unexpected message format')
       return