fix ci failures

* Bump uuid, @actions/core and @actions/tool-cache

Bumps [uuid](https://github.com/uuidjs/uuid), [@actions/core](https://github.com/actions/toolkit/tree/HEAD/packages/core) and [@actions/tool-cache](https://github.com/actions/toolkit/tree/HEAD/packages/tool-cache). These dependencies needed to be updated together.

Updates `uuid` from 9.0.1 to 14.0.0
- [Release notes](https://github.com/uuidjs/uuid/releases)
- [Changelog](https://github.com/uuidjs/uuid/blob/main/CHANGELOG.md)
- [Commits](https://github.com/uuidjs/uuid/compare/v9.0.1...v14.0.0)

Updates `@actions/core` from 1.10.1 to 1.11.1
- [Changelog](https://github.com/actions/toolkit/blob/main/packages/core/RELEASES.md)
- [Commits](https://github.com/actions/toolkit/commits/HEAD/packages/core)

Updates `@actions/tool-cache` from 2.0.1 to 2.0.2
- [Changelog](https://github.com/actions/toolkit/blob/main/packages/tool-cache/RELEASES.md)
- [Commits](https://github.com/actions/toolkit/commits/HEAD/packages/tool-cache)

---
updated-dependencies:
- dependency-name: uuid
  dependency-version: 14.0.0
  dependency-type: direct:production
- dependency-name: "@actions/core"
  dependency-version: 1.11.1
  dependency-type: direct:production
- dependency-name: "@actions/tool-cache"
  dependency-version: 2.0.2
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

* switch to use crpto.randomUUID

* update license

---------

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Aiqiao Yan <55104035+aiqiaoy@users.noreply.github.com>

.github/workflows/check-dist.yml

@@ -22,12 +22,12 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-      - uses: actions/checkout@v4.1.6
+      - uses: actions/checkout@v6
 
-      - name: Set Node.js 20.x
+      - name: Set Node.js 24.x
         uses: actions/setup-node@v4
         with:
-          node-version: 20.x
+          node-version: 24.x
 
       - name: Install dependencies
         run: npm ci

.github/workflows/codeql-analysis.yml

@@ -39,7 +39,7 @@ jobs:
 
     steps:
     - name: Checkout repository
-      uses: actions/checkout@v4.1.6
+      uses: actions/checkout@v6
 
     - name: Initialize CodeQL
       uses: github/codeql-action/init@v3

.github/workflows/licensed.yml

@@ -9,6 +9,6 @@ jobs:
     runs-on: ubuntu-latest
     name: Check licenses
     steps:
-      - uses: actions/checkout@v4.1.6
+      - uses: actions/checkout@v6
       - run: npm ci
       - run: npm run licensed-check

.github/workflows/publish-immutable-actions.yml

@@ -14,7 +14,7 @@ jobs:
 
     steps:
       - name: Checking out
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
       - name: Publish
         id: publish
-        uses: actions/publish-immutable-action@0.0.3
+        uses: actions/publish-immutable-action@v0.0.4

.github/workflows/test.yml

@@ -18,8 +18,8 @@ jobs:
     steps:
       - uses: actions/setup-node@v4
         with:
-          node-version: 20.x
+          node-version: 24.x
-      - uses: actions/checkout@v4.1.6
+      - uses: actions/checkout@v6
       - run: npm ci
       - run: npm run build
       - run: npm run format-check
@@ -37,7 +37,7 @@ jobs:
     steps:
       # Clone this repo
       - name: Checkout
-        uses: actions/checkout@v4.1.6
+        uses: actions/checkout@v6
 
       # Basic checkout
       - name: Checkout basic
@@ -87,6 +87,17 @@ 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: ./
@@ -165,6 +176,22 @@ jobs:
       - name: Verify submodules recursive
         run: __test__/verify-submodules-recursive.sh
 
+      # Worktree credentials
+      - name: Checkout for worktree test
+        uses: ./
+        with:
+          path: worktree-test
+      - name: Verify worktree credentials
+        shell: bash
+        run: __test__/verify-worktree.sh worktree-test worktree-branch
+
+      # Worktree credentials in container step
+      - name: Verify worktree credentials in container step
+        if: runner.os == 'Linux'
+        uses: docker://bitnami/git:latest
+        with:
+          args: bash __test__/verify-worktree.sh worktree-test container-worktree-branch
+
       # Basic checkout using REST API
       - name: Remove basic
         if: runner.os != 'windows'
@@ -202,7 +229,7 @@ jobs:
     steps:
       # Clone this repo
       - name: Checkout
-        uses: actions/checkout@v4.1.6
+        uses: actions/checkout@v6
 
       # Basic checkout using git
       - name: Checkout basic
@@ -234,7 +261,7 @@ jobs:
     steps:
       # Clone this repo
       - name: Checkout
-        uses: actions/checkout@v4.1.6
+        uses: actions/checkout@v6
 
       # Basic checkout using git
       - name: Checkout basic
@@ -264,7 +291,7 @@ jobs:
     steps:
       # Clone this repo
       - name: Checkout
-        uses: actions/checkout@v4.1.6
+        uses: actions/checkout@v6
         with:
           path: localClone
 
@@ -291,8 +318,8 @@ jobs:
           git fetch --no-tags --depth=1 origin +refs/heads/main:refs/remotes/origin/main
 
       # needed to make checkout post cleanup succeed
-      - name: Fix Checkout v4
+      - name: Fix Checkout v6
-        uses: actions/checkout@v4.1.6
+        uses: actions/checkout@v6
         with:
           path: localClone
 
@@ -301,13 +328,16 @@ jobs:
     steps:
       # Clone this repo
       - name: Checkout
-        uses: actions/checkout@v4.1.6
+        uses: actions/checkout@v6
+        with:
+          path: actions-checkout
 
       # Basic checkout using git
       - name: Checkout basic
         id: checkout
-        uses: ./
+        uses: ./actions-checkout
         with:
+          path: cloned-using-local-action
           ref: test-data/v2/basic
 
       # Verify output
@@ -325,7 +355,3 @@ jobs:
             echo "Expected commit to be 82f71901cf8c021332310dcc8cdba84c4193ff5d"
             exit 1
           fi
-
-      # needed to make checkout post cleanup succeed
-      - name: Fix Checkout
-        uses: actions/checkout@v4.1.6

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

@@ -11,6 +11,7 @@ on:
         type: choice
         description: The major version to update
         options:
+          - v5
           - v4
           - v3
           - v2
@@ -22,7 +23,7 @@ jobs:
     # Note this update workflow can also be used as a rollback tool.
     # For that reason, it's best to pin `actions/checkout` to a known, stable version
     # (typically, about two releases back).
-    - uses: actions/checkout@v4.1.6
+    - uses: actions/checkout@v6
       with:
         fetch-depth: 0
     - name: Git config

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

@@ -26,7 +26,7 @@ jobs:
  
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       # Use `docker/login-action` to log in to GHCR.io. 
       # Once published, the packages are scoped to the account defined here.

.licensed.yml

@@ -11,4 +11,5 @@ allowed:
   - unlicense
 
 reviewed:
-  npm:
+  npm:
+    - "@actions/http-client" # MIT

.licenses/npm/@actions/core.dep.yml

@@ -1,6 +1,6 @@
 ---
 name: "@actions/core"
-version: 1.10.1
+version: 3.0.1
 type: npm
 summary: Actions core lib
 homepage: https://github.com/actions/toolkit/tree/main/packages/core

.licenses/npm/@actions/exec.dep.yml

@@ -1,6 +1,6 @@
 ---
 name: "@actions/exec"
-version: 1.1.1
+version: 3.0.0
 type: npm
 summary: Actions exec lib
 homepage: https://github.com/actions/toolkit/tree/main/packages/exec

.licenses/npm/@actions/github.dep.yml

@@ -1,6 +1,6 @@
 ---
 name: "@actions/github"
-version: 6.0.0
+version: 9.1.1
 type: npm
 summary: Actions github lib
 homepage: https://github.com/actions/toolkit/tree/main/packages/github

.licenses/npm/@actions/http-client-3.0.2.dep.yml

@@ -1,10 +1,10 @@
 ---
 name: "@actions/http-client"
-version: 2.2.1
+version: 3.0.2
 type: npm
 summary: Actions Http Client
 homepage: https://github.com/actions/toolkit/tree/main/packages/http-client
-license: mit
+license: other
 licenses:
 - sources: LICENSE
   text: |

.licenses/npm/@actions/http-client-4.0.1.dep.yml

@@ -0,0 +1,32 @@
+---
+name: "@actions/http-client"
+version: 4.0.1
+type: npm
+summary: Actions Http Client
+homepage: https://github.com/actions/toolkit/tree/main/packages/http-client
+license: other
+licenses:
+- sources: LICENSE
+  text: |
+    Actions Http Client for Node.js
+
+    Copyright (c) GitHub, Inc.
+
+    All rights reserved.
+
+    MIT License
+
+    Permission is hereby granted, free of charge, to any person obtaining a copy of this software and
+    associated documentation files (the "Software"), to deal in the Software without restriction,
+    including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense,
+    and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so,
+    subject to the following conditions:
+
+    The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
+
+    THE SOFTWARE IS PROVIDED *AS IS*, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT
+    LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
+    NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+    WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+    SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+notices: []

.licenses/npm/@actions/io.dep.yml

@@ -1,6 +1,6 @@
 ---
 name: "@actions/io"
-version: 1.1.3
+version: 3.0.2
 type: npm
 summary: Actions io lib
 homepage: https://github.com/actions/toolkit/tree/main/packages/io

.licenses/npm/@actions/tool-cache.dep.yml

@@ -1,6 +1,6 @@
 ---
 name: "@actions/tool-cache"
-version: 2.0.1
+version: 4.0.0
 type: npm
 summary: Actions tool-cache lib
 homepage: https://github.com/actions/toolkit/tree/main/packages/tool-cache

.licenses/npm/@fastify/busboy.dep.yml

@@ -1,30 +0,0 @@
----
-name: "@fastify/busboy"
-version: 2.1.1
-type: npm
-summary: A streaming parser for HTML form data for node.js
-homepage: 
-license: mit
-licenses:
-- sources: LICENSE
-  text: |-
-    Copyright Brian White. All rights reserved.
-
-    Permission is hereby granted, free of charge, to any person obtaining a copy
-    of this software and associated documentation files (the "Software"), to
-    deal in the Software without restriction, including without limitation the
-    rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
-    sell copies of the Software, and to permit persons to whom the Software is
-    furnished to do so, subject to the following conditions:
-
-    The above copyright notice and this permission notice shall be included in
-    all copies or substantial portions of the Software.
-
-    THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-    IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-    FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
-    AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
-    LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
-    FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
-    IN THE SOFTWARE.
-notices: []

.licenses/npm/@octokit/auth-token.dep.yml

@@ -1,6 +1,6 @@
 ---
 name: "@octokit/auth-token"
-version: 4.0.0
+version: 6.0.0
 type: npm
 summary: GitHub API token authentication for browsers and Node.js
 homepage: 

.licenses/npm/@octokit/core.dep.yml

@@ -1,6 +1,6 @@
 ---
 name: "@octokit/core"
-version: 5.2.0
+version: 7.0.6
 type: npm
 summary: Extendable client for GitHub's REST & GraphQL APIs
 homepage: 

.licenses/npm/@octokit/endpoint.dep.yml

@@ -1,9 +1,9 @@
 ---
 name: "@octokit/endpoint"
-version: 9.0.6
+version: 11.0.3
 type: npm
 summary: Turns REST API endpoints into generic request options
-homepage:
+homepage: 
 license: mit
 licenses:
 - sources: LICENSE

.licenses/npm/@octokit/graphql.dep.yml

@@ -1,6 +1,6 @@
 ---
 name: "@octokit/graphql"
-version: 7.1.0
+version: 9.0.3
 type: npm
 summary: GitHub GraphQL API client for browsers and Node
 homepage: 

.licenses/npm/@octokit/openapi-types-22.1.0.dep.yml

@@ -1,20 +0,0 @@
----
-name: "@octokit/openapi-types"
-version: 22.1.0
-type: npm
-summary: Generated TypeScript definitions based on GitHub's OpenAPI spec for api.github.com
-homepage: 
-license: mit
-licenses:
-- sources: LICENSE
-  text: |-
-    Copyright 2020 Gregor Martynus
-
-    Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
-
-    The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
-
-    THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
-- sources: README.md
-  text: "[MIT](LICENSE)"
-notices: []

.licenses/npm/@octokit/openapi-types.dep.yml

@@ -1,14 +1,14 @@
 ---
 name: "@octokit/openapi-types"
-version: 20.0.0
+version: 27.0.0
 type: npm
 summary: Generated TypeScript definitions based on GitHub's OpenAPI spec for api.github.com
 homepage: 
 license: mit
 licenses:
 - sources: LICENSE
-  text: |-
+  text: |
-    Copyright 2020 Gregor Martynus
+    Copyright (c) GitHub 2025 - Licensed as MIT.
 
     Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
 

.licenses/npm/@octokit/plugin-paginate-rest.dep.yml

@@ -1,9 +1,9 @@
 ---
 name: "@octokit/plugin-paginate-rest"
-version: 9.2.2
+version: 14.0.0
 type: npm
 summary: Octokit plugin to paginate REST API endpoint responses
-homepage:
+homepage: 
 license: mit
 licenses:
 - sources: LICENSE

.licenses/npm/@octokit/plugin-rest-endpoint-methods.dep.yml

@@ -1,6 +1,6 @@
 ---
 name: "@octokit/plugin-rest-endpoint-methods"
-version: 10.4.1
+version: 17.0.0
 type: npm
 summary: Octokit plugin adding one method for all of api.github.com REST API endpoints
 homepage: 

.licenses/npm/@octokit/request-error.dep.yml

@@ -1,9 +1,9 @@
 ---
 name: "@octokit/request-error"
-version: 5.1.1
+version: 7.1.0
 type: npm
 summary: Error class for Octokit request errors
-homepage:
+homepage: 
 license: mit
 licenses:
 - sources: LICENSE

.licenses/npm/@octokit/request.dep.yml

@@ -1,10 +1,10 @@
 ---
 name: "@octokit/request"
-version: 8.4.1
+version: 10.0.10
 type: npm
 summary: Send parameterized requests to GitHub's APIs with sensible defaults in browsers
   and Node
-homepage:
+homepage: 
 license: mit
 licenses:
 - sources: LICENSE

.licenses/npm/@octokit/types-13.4.1.dep.yml

@@ -1,20 +0,0 @@
----
-name: "@octokit/types"
-version: 13.4.1
-type: npm
-summary: Shared TypeScript definitions for Octokit projects
-homepage: 
-license: mit
-licenses:
-- sources: LICENSE
-  text: |
-    MIT License Copyright (c) 2019 Octokit contributors
-
-    Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
-
-    The above copyright notice and this permission notice (including the next paragraph) shall be included in all copies or substantial portions of the Software.
-
-    THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
-- sources: README.md
-  text: "[MIT](LICENSE)"
-notices: []

.licenses/npm/@octokit/types.dep.yml

@@ -1,6 +1,6 @@
 ---
 name: "@octokit/types"
-version: 12.6.0
+version: 16.0.0
 type: npm
 summary: Shared TypeScript definitions for Octokit projects
 homepage: 

.licenses/npm/before-after-hook.dep.yml

@@ -1,6 +1,6 @@
 ---
 name: before-after-hook
-version: 2.2.3
+version: 4.0.0
 type: npm
 summary: asynchronous before/error/after hooks for internal functionality
 homepage: 

.licenses/npm/content-type.dep.yml

@@ -0,0 +1,47 @@
+---
+name: content-type
+version: 2.0.0
+type: npm
+summary: Create and parse HTTP Content-Type header
+homepage: 
+license: mit
+licenses:
+- sources: LICENSE
+  text: |
+    (The MIT License)
+
+    Copyright (c) 2015 Douglas Christopher Wilson
+
+    Permission is hereby granted, free of charge, to any person obtaining
+    a copy of this software and associated documentation files (the
+    'Software'), to deal in the Software without restriction, including
+    without limitation the rights to use, copy, modify, merge, publish,
+    distribute, sublicense, and/or sell copies of the Software, and to
+    permit persons to whom the Software is furnished to do so, subject to
+    the following conditions:
+
+    The above copyright notice and this permission notice shall be
+    included in all copies or substantial portions of the Software.
+
+    THE SOFTWARE IS PROVIDED 'AS IS', WITHOUT WARRANTY OF ANY KIND,
+    EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+    MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+    IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+    CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+    TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+    SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+- sources: README.md
+  text: |-
+    [MIT](LICENSE)
+
+    [npm-image]: https://img.shields.io/npm/v/content-type
+    [npm-url]: https://npmjs.org/package/content-type
+    [downloads-image]: https://img.shields.io/npm/dm/content-type
+    [downloads-url]: https://npmjs.org/package/content-type
+    [build-image]: https://img.shields.io/github/actions/workflow/status/jshttp/content-type/ci.yml?branch=master
+    [build-url]: https://github.com/jshttp/content-type/actions/workflows/ci.yml?query=branch%3Amaster
+    [coverage-image]: https://img.shields.io/codecov/c/gh/jshttp/content-type
+    [coverage-url]: https://codecov.io/gh/jshttp/content-type
+    [license-image]: http://img.shields.io/npm/l/content-type.svg?style=flat
+    [license-url]: LICENSE
+notices: []

.licenses/npm/deprecation.dep.yml

@@ -1,28 +0,0 @@
----
-name: deprecation
-version: 2.3.1
-type: npm
-summary: Log a deprecation message with stack
-homepage: https://github.com/gr2m/deprecation#readme
-license: isc
-licenses:
-- sources: LICENSE
-  text: |
-    The ISC License
-
-    Copyright (c) Gregor Martynus and contributors
-
-    Permission to use, copy, modify, and/or distribute this software for any
-    purpose with or without fee is hereby granted, provided that the above
-    copyright notice and this permission notice appear in all copies.
-
-    THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
-    WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-    MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
-    ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
-    WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
-    ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR
-    IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
-- sources: README.md
-  text: "[ISC](LICENSE)"
-notices: []

.licenses/npm/json-with-bigint.dep.yml

@@ -1,16 +1,17 @@
 ---
-name: uuid
+name: json-with-bigint
-version: 3.4.0
+version: 3.5.8
 type: npm
-summary: RFC4122 (v1, v4, and v5) UUIDs
+summary: JS library that allows you to easily serialize and deserialize data with
+  BigInt values
 homepage: 
 license: mit
 licenses:
-- sources: LICENSE.md
+- sources: LICENSE
   text: |
-    The MIT License (MIT)
+    MIT License
 
-    Copyright (c) 2010-2016 Robert Kieffer and other contributors
+    Copyright (c) 2023 Ivan Korolenko
 
     Permission is hereby granted, free of charge, to any person obtaining a copy
     of this software and associated documentation files (the "Software"), to deal
@@ -29,11 +30,4 @@ licenses:
     LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
     OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
     SOFTWARE.
-notices:
+notices: []
-- sources: AUTHORS
-  text: |-
-    Robert Kieffer <robert@broofa.com>
-    Christoph Tavan <dev@tavan.de>
-    AJ ONeal <coolaj86@gmail.com>
-    Vincent Voyer <vincent@zeroload.net>
-    Roman Shtylman <shtylman@gmail.com>

.licenses/npm/once.dep.yml

@@ -1,26 +0,0 @@
----
-name: once
-version: 1.4.0
-type: npm
-summary: Run a function exactly one time
-homepage: https://github.com/isaacs/once#readme
-license: isc
-licenses:
-- sources: LICENSE
-  text: |
-    The ISC License
-
-    Copyright (c) Isaac Z. Schlueter and Contributors
-
-    Permission to use, copy, modify, and/or distribute this software for any
-    purpose with or without fee is hereby granted, provided that the above
-    copyright notice and this permission notice appear in all copies.
-
-    THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
-    WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-    MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
-    ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
-    WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
-    ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR
-    IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
-notices: []

.licenses/npm/semver.dep.yml

@@ -1,6 +1,6 @@
 ---
 name: semver
-version: 6.3.1
+version: 7.8.4
 type: npm
 summary: The semantic version parser used by npm.
 homepage: 

.licenses/npm/undici.dep.yml

@@ -1,6 +1,6 @@
 ---
 name: undici
-version: 5.29.0
+version: 6.27.0
 type: npm
 summary: An HTTP/1.1 client, written from scratch for Node.js
 homepage: https://undici.nodejs.org

.licenses/npm/universal-user-agent.dep.yml

@@ -1,8 +1,8 @@
 ---
 name: universal-user-agent
-version: 6.0.1
+version: 7.0.3
 type: npm
-summary: Get a user agent string in both browser and node
+summary: Get a user agent string across all JavaScript Runtime Environments
 homepage: 
 license: isc
 licenses:
@@ -10,7 +10,7 @@ licenses:
   text: |
     # [ISC License](https://spdx.org/licenses/ISC)
 
-    Copyright (c) 2018, Gregor Martynus (https://github.com/gr2m)
+    Copyright (c) 2018-2021, Gregor Martynus (https://github.com/gr2m)
 
     Permission to use, copy, modify, and/or distribute this software for any purpose with or without fee is hereby granted, provided that the above copyright notice and this permission notice appear in all copies.
 

.licenses/npm/uuid-8.3.2.dep.yml

@@ -1,20 +0,0 @@
----
-name: uuid
-version: 8.3.2
-type: npm
-summary: RFC4122 (v1, v4, and v5) UUIDs
-homepage: https://github.com/uuidjs/uuid#readme
-license: mit
-licenses:
-- sources: LICENSE.md
-  text: |
-    The MIT License (MIT)
-
-    Copyright (c) 2010-2020 Robert Kieffer and other contributors
-
-    Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
-
-    The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
-
-    THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
-notices: []

.licenses/npm/uuid-9.0.1.dep.yml

@@ -1,20 +0,0 @@
----
-name: uuid
-version: 9.0.1
-type: npm
-summary: RFC4122 (v1, v4, and v5) UUIDs
-homepage: 
-license: mit
-licenses:
-- sources: LICENSE.md
-  text: |
-    The MIT License (MIT)
-
-    Copyright (c) 2010-2020 Robert Kieffer and other contributors
-
-    Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
-
-    The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
-
-    THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
-notices: []

.licenses/npm/wrappy.dep.yml

@@ -1,26 +0,0 @@
----
-name: wrappy
-version: 1.0.2
-type: npm
-summary: Callback wrapping utility
-homepage: https://github.com/npm/wrappy
-license: isc
-licenses:
-- sources: LICENSE
-  text: |
-    The ISC License
-
-    Copyright (c) Isaac Z. Schlueter and Contributors
-
-    Permission to use, copy, modify, and/or distribute this software for any
-    purpose with or without fee is hereby granted, provided that the above
-    copyright notice and this permission notice appear in all copies.
-
-    THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
-    WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-    MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
-    ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
-    WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
-    ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR
-    IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
-notices: []

CHANGELOG.md

@@ -1,6 +1,29 @@
 # Changelog
 
-## V4.3.0
+## 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
+
+## v5.0.1
+* Port v6 cleanup to v5 by @ericsciple in https://github.com/actions/checkout/pull/2301
+
+## v5.0.0
+* Update actions checkout to use node 24 by @salmanmkc in https://github.com/actions/checkout/pull/2226
+
+## v4.3.1
+* Port v6 cleanup to v4 by @ericsciple in https://github.com/actions/checkout/pull/2305
+
+## v4.3.0
 * docs: update README.md by @motss in https://github.com/actions/checkout/pull/1971
 * Add internal repos for checking out multiple repositories by @mouismail in https://github.com/actions/checkout/pull/1977
 * Documentation update - add recommended permissions to Readme by @benwells in https://github.com/actions/checkout/pull/2043

README.md

@@ -1,6 +1,22 @@
 [![Build and Test](https://github.com/actions/checkout/actions/workflows/test.yml/badge.svg)](https://github.com/actions/checkout/actions/workflows/test.yml)
 
-# Checkout V4
+# Checkout v6
+
+## What's new
+
+- Improved credential security: `persist-credentials` now stores credentials in a separate file under `$RUNNER_TEMP` instead of directly in `.git/config`
+- No workflow changes required — `git fetch`, `git push`, etc. continue to work automatically
+- Running authenticated git commands from a [Docker container action](https://docs.github.com/actions/sharing-automations/creating-actions/creating-a-docker-container-action) requires Actions Runner [v2.329.0](https://github.com/actions/runner/releases/tag/v2.329.0) or later
+
+# Checkout v5
+
+## What's new
+
+- Updated to the node24 runtime
+  - This requires a minimum Actions Runner version of [v2.327.1](https://github.com/actions/runner/releases/tag/v2.327.1) to run.
+
+
+# Checkout v4
 
 This action checks-out your repository under `$GITHUB_WORKSPACE`, so your workflow can access it.
 
@@ -36,7 +52,7 @@ Please refer to the [release page](https://github.com/actions/checkout/releases/
 
 <!-- start usage -->
 ```yaml
-- uses: actions/checkout@v4
+- uses: actions/checkout@v6
   with:
     # Repository name with owner. For example, actions/checkout
     # Default: ${{ github.repository }}
@@ -144,29 +160,47 @@ 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 -->
 
 # Scenarios
 
-- [Fetch only the root files](#Fetch-only-the-root-files)
+- [Checkout V5](#checkout-v5)
-- [Fetch only the root files and `.github` and `src` folder](#Fetch-only-the-root-files-and-github-and-src-folder)
+  - [What's new](#whats-new)
-- [Fetch only a single file](#Fetch-only-a-single-file)
+- [Checkout V4](#checkout-v4)
-- [Fetch all history for all tags and branches](#Fetch-all-history-for-all-tags-and-branches)
+    - [Note](#note)
-- [Checkout a different branch](#Checkout-a-different-branch)
+- [What's new](#whats-new-1)
-- [Checkout HEAD^](#Checkout-HEAD)
+- [Usage](#usage)
-- [Checkout multiple repos (side by side)](#Checkout-multiple-repos-side-by-side)
+- [Scenarios](#scenarios)
-- [Checkout multiple repos (nested)](#Checkout-multiple-repos-nested)
+  - [Fetch only the root files](#fetch-only-the-root-files)
-- [Checkout multiple repos (private)](#Checkout-multiple-repos-private)
+  - [Fetch only the root files and `.github` and `src` folder](#fetch-only-the-root-files-and-github-and-src-folder)
-- [Checkout pull request HEAD commit instead of merge commit](#Checkout-pull-request-HEAD-commit-instead-of-merge-commit)
+  - [Fetch only a single file](#fetch-only-a-single-file)
-- [Checkout pull request on closed event](#Checkout-pull-request-on-closed-event)
+  - [Fetch all history for all tags and branches](#fetch-all-history-for-all-tags-and-branches)
-- [Push a commit using the built-in token](#Push-a-commit-using-the-built-in-token)
+  - [Checkout a different branch](#checkout-a-different-branch)
-- [Push a commit to a PR using the built-in token](#Push-a-commit-to-a-PR-using-the-built-in-token)
+  - [Checkout HEAD^](#checkout-head)
+  - [Checkout multiple repos (side by side)](#checkout-multiple-repos-side-by-side)
+  - [Checkout multiple repos (nested)](#checkout-multiple-repos-nested)
+  - [Checkout multiple repos (private)](#checkout-multiple-repos-private)
+  - [Checkout pull request HEAD commit instead of merge commit](#checkout-pull-request-head-commit-instead-of-merge-commit)
+  - [Checkout pull request on closed event](#checkout-pull-request-on-closed-event)
+  - [Push a commit using the built-in token](#push-a-commit-using-the-built-in-token)
+  - [Push a commit to a PR using the built-in token](#push-a-commit-to-a-pr-using-the-built-in-token)
+- [Recommended permissions](#recommended-permissions)
+- [License](#license)
 
 ## Fetch only the root files
 
 ```yaml
-- uses: actions/checkout@v4
+- uses: actions/checkout@v6
   with:
     sparse-checkout: .
 ```
@@ -174,7 +208,7 @@ Please refer to the [release page](https://github.com/actions/checkout/releases/
 ## Fetch only the root files and `.github` and `src` folder
 
 ```yaml
-- uses: actions/checkout@v4
+- uses: actions/checkout@v6
   with:
     sparse-checkout: |
       .github
@@ -184,7 +218,7 @@ Please refer to the [release page](https://github.com/actions/checkout/releases/
 ## Fetch only a single file
 
 ```yaml
-- uses: actions/checkout@v4
+- uses: actions/checkout@v6
   with:
     sparse-checkout: |
       README.md
@@ -194,7 +228,7 @@ Please refer to the [release page](https://github.com/actions/checkout/releases/
 ## Fetch all history for all tags and branches
 
 ```yaml
-- uses: actions/checkout@v4
+- uses: actions/checkout@v6
   with:
     fetch-depth: 0
 ```
@@ -202,7 +236,7 @@ Please refer to the [release page](https://github.com/actions/checkout/releases/
 ## Checkout a different branch
 
 ```yaml
-- uses: actions/checkout@v4
+- uses: actions/checkout@v6
   with:
     ref: my-branch
 ```
@@ -210,7 +244,7 @@ Please refer to the [release page](https://github.com/actions/checkout/releases/
 ## Checkout HEAD^
 
 ```yaml
-- uses: actions/checkout@v4
+- uses: actions/checkout@v6
   with:
     fetch-depth: 2
 - run: git checkout HEAD^
@@ -220,12 +254,12 @@ Please refer to the [release page](https://github.com/actions/checkout/releases/
 
 ```yaml
 - name: Checkout
-  uses: actions/checkout@v4
+  uses: actions/checkout@v6
   with:
     path: main
 
 - name: Checkout tools repo
-  uses: actions/checkout@v4
+  uses: actions/checkout@v6
   with:
     repository: my-org/my-tools
     path: my-tools
@@ -236,10 +270,10 @@ Please refer to the [release page](https://github.com/actions/checkout/releases/
 
 ```yaml
 - name: Checkout
-  uses: actions/checkout@v4
+  uses: actions/checkout@v6
 
 - name: Checkout tools repo
-  uses: actions/checkout@v4
+  uses: actions/checkout@v6
   with:
     repository: my-org/my-tools
     path: my-tools
@@ -250,12 +284,12 @@ Please refer to the [release page](https://github.com/actions/checkout/releases/
 
 ```yaml
 - name: Checkout
-  uses: actions/checkout@v4
+  uses: actions/checkout@v6
   with:
     path: main
 
 - name: Checkout private tools
-  uses: actions/checkout@v4
+  uses: actions/checkout@v6
   with:
     repository: my-org/my-private-tools
     token: ${{ secrets.GH_PAT }} # `GH_PAT` is a secret that contains your PAT
@@ -268,7 +302,7 @@ Please refer to the [release page](https://github.com/actions/checkout/releases/
 ## Checkout pull request HEAD commit instead of merge commit
 
 ```yaml
-- uses: actions/checkout@v4
+- uses: actions/checkout@v6
   with:
     ref: ${{ github.event.pull_request.head.sha }}
 ```
@@ -284,7 +318,7 @@ jobs:
   build:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
 ```
 
 ## Push a commit using the built-in token
@@ -295,7 +329,7 @@ jobs:
   build:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - run: |
           date > generated.txt
           # Note: the following account information will not work on GHES
@@ -317,7 +351,7 @@ jobs:
   build:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
         with:
           ref: ${{ github.head_ref }}
       - run: |

__test__/git-auth-helper.test.ts

@@ -1,12 +1,46 @@
-import * as core from '@actions/core'
+import {
+  jest,
+  describe,
+  it,
+  expect,
+  beforeAll,
+  beforeEach,
+  afterEach,
+  afterAll
+} from '@jest/globals'
 import * as fs from 'fs'
-import * as gitAuthHelper from '../lib/git-auth-helper'
 import * as io from '@actions/io'
 import * as os from 'os'
 import * as path from 'path'
-import * as stateHelper from '../lib/state-helper'
+import {fileURLToPath} from 'url'
-import {IGitCommandManager} from '../lib/git-command-manager'
+
-import {IGitSourceSettings} from '../lib/git-source-settings'
+const __dirname = path.dirname(fileURLToPath(import.meta.url))
+
+// Mock @actions/core before loading git-auth-helper
+jest.unstable_mockModule('@actions/core', () => ({
+  setSecret: jest.fn(),
+  error: jest.fn(),
+  warning: jest.fn(),
+  info: jest.fn(),
+  debug: jest.fn(),
+  setFailed: jest.fn()
+}))
+
+// Mock state-helper
+jest.unstable_mockModule('../src/state-helper.js', () => ({
+  setSshKeyPath: jest.fn(),
+  setSshKnownHostsPath: jest.fn(),
+  IsPost: false,
+  RepositoryPath: ''
+}))
+
+// Dynamic imports after mocking
+const core = await import('@actions/core')
+const gitAuthHelper = await import('../src/git-auth-helper.js')
+type IGitCommandManager =
+  import('../src/git-command-manager.js').IGitCommandManager
+type IGitSourceSettings =
+  import('../src/git-source-settings.js').IGitSourceSettings
 
 const isWindows = process.platform === 'win32'
 const testWorkspace = path.join(__dirname, '_temp', 'git-auth-helper')
@@ -32,25 +66,12 @@ describe('git-auth-helper tests', () => {
   })
 
   beforeEach(() => {
-    // Mock setSecret
+    jest.clearAllMocks()
-    jest.spyOn(core, 'setSecret').mockImplementation((secret: string) => {})
-
-    // Mock error/warning/info/debug
-    jest.spyOn(core, 'error').mockImplementation(jest.fn())
-    jest.spyOn(core, 'warning').mockImplementation(jest.fn())
-    jest.spyOn(core, 'info').mockImplementation(jest.fn())
-    jest.spyOn(core, 'debug').mockImplementation(jest.fn())
-
-    // Mock state helper
-    jest.spyOn(stateHelper, 'setSshKeyPath').mockImplementation(jest.fn())
-    jest
-      .spyOn(stateHelper, 'setSshKnownHostsPath')
-      .mockImplementation(jest.fn())
   })
 
   afterEach(() => {
     // Unregister mocks
-    jest.restoreAllMocks()
+    jest.clearAllMocks()
 
     // Restore HOME
     if (originalHome) {
@@ -86,16 +107,29 @@ describe('git-auth-helper tests', () => {
     // Act
     await authHelper.configureAuth()
 
-    // Assert config
+    // Assert config - check that .git/config contains includeIf entries
-    const configContent = (
+    const localConfigContent = (
       await fs.promises.readFile(localGitConfigPath)
     ).toString()
+    expect(
+      localConfigContent.indexOf('includeIf.gitdir:')
+    ).toBeGreaterThanOrEqual(0)
+
+    // Assert credentials config file contains the actual credentials
+    const credentialsFiles = (await fs.promises.readdir(runnerTemp)).filter(
+      f => f.startsWith('git-credentials-') && f.endsWith('.config')
+    )
+    expect(credentialsFiles.length).toBe(1)
+    const credentialsConfigPath = path.join(runnerTemp, credentialsFiles[0])
+    const credentialsContent = (
+      await fs.promises.readFile(credentialsConfigPath)
+    ).toString()
     const basicCredential = Buffer.from(
       `x-access-token:${settings.authToken}`,
       'utf8'
     ).toString('base64')
     expect(
-      configContent.indexOf(
+      credentialsContent.indexOf(
         `http.${expectedServerUrl}/.extraheader AUTHORIZATION: basic ${basicCredential}`
       )
     ).toBeGreaterThanOrEqual(0)
@@ -120,7 +154,7 @@ describe('git-auth-helper tests', () => {
     'inject https://github.com as github server url'
   it(configureAuth_AcceptsGitHubServerUrlSetToGHEC, async () => {
     await testAuthHeader(
-      configureAuth_AcceptsGitHubServerUrl,
+      configureAuth_AcceptsGitHubServerUrlSetToGHEC,
       'https://github.com'
     )
   })
@@ -141,12 +175,17 @@ describe('git-auth-helper tests', () => {
       // Act
       await authHelper.configureAuth()
 
-      // Assert config
+      // Assert config - check credentials config file (not local .git/config)
-      const configContent = (
+      const credentialsFiles = (await fs.promises.readdir(runnerTemp)).filter(
-        await fs.promises.readFile(localGitConfigPath)
+        f => f.startsWith('git-credentials-') && f.endsWith('.config')
+      )
+      expect(credentialsFiles.length).toBe(1)
+      const credentialsConfigPath = path.join(runnerTemp, credentialsFiles[0])
+      const credentialsContent = (
+        await fs.promises.readFile(credentialsConfigPath)
       ).toString()
       expect(
-        configContent.indexOf(
+        credentialsContent.indexOf(
           `http.https://github.com/.extraheader AUTHORIZATION`
         )
       ).toBeGreaterThanOrEqual(0)
@@ -211,7 +250,7 @@ describe('git-auth-helper tests', () => {
     await authHelper.configureAuth()
 
     // Assert secret
-    const setSecretSpy = core.setSecret as jest.Mock<any, any>
+    const setSecretSpy = core.setSecret as jest.Mock<any>
     expect(setSecretSpy).toHaveBeenCalledTimes(1)
     const expectedSecret = Buffer.from(
       `x-access-token:${settings.authToken}`,
@@ -251,13 +290,16 @@ describe('git-auth-helper tests', () => {
       expectedSshCommand
     )
 
-    // Asserty git config
+    // Assert git config
     const gitConfigLines = (await fs.promises.readFile(localGitConfigPath))
       .toString()
       .split('\n')
       .filter(x => x)
-    expect(gitConfigLines).toHaveLength(1)
+    // Should have includeIf entries pointing to credentials file
-    expect(gitConfigLines[0]).toMatch(/^http\./)
+    expect(gitConfigLines.length).toBeGreaterThan(0)
+    expect(
+      gitConfigLines.some(line => line.indexOf('includeIf.gitdir:') >= 0)
+    ).toBeTruthy()
   })
 
   const configureAuth_setsSshCommandWhenPersistCredentialsTrue =
@@ -419,8 +461,20 @@ describe('git-auth-helper tests', () => {
     expect(
       configContent.indexOf('value-from-global-config')
     ).toBeGreaterThanOrEqual(0)
+    // Global config should have include.path pointing to credentials file
+    expect(configContent.indexOf('include.path')).toBeGreaterThanOrEqual(0)
+
+    // Check credentials in the separate config file
+    const credentialsFiles = (await fs.promises.readdir(runnerTemp)).filter(
+      f => f.startsWith('git-credentials-') && f.endsWith('.config')
+    )
+    expect(credentialsFiles.length).toBeGreaterThan(0)
+    const credentialsConfigPath = path.join(runnerTemp, credentialsFiles[0])
+    const credentialsContent = (
+      await fs.promises.readFile(credentialsConfigPath)
+    ).toString()
     expect(
-      configContent.indexOf(
+      credentialsContent.indexOf(
         `http.https://github.com/.extraheader AUTHORIZATION: basic ${basicCredential}`
       )
     ).toBeGreaterThanOrEqual(0)
@@ -463,8 +517,20 @@ describe('git-auth-helper tests', () => {
       const configContent = (
         await fs.promises.readFile(path.join(git.env['HOME'], '.gitconfig'))
       ).toString()
+      // Global config should have include.path pointing to credentials file
+      expect(configContent.indexOf('include.path')).toBeGreaterThanOrEqual(0)
+
+      // Check credentials in the separate config file
+      const credentialsFiles = (await fs.promises.readdir(runnerTemp)).filter(
+        f => f.startsWith('git-credentials-') && f.endsWith('.config')
+      )
+      expect(credentialsFiles.length).toBeGreaterThan(0)
+      const credentialsConfigPath = path.join(runnerTemp, credentialsFiles[0])
+      const credentialsContent = (
+        await fs.promises.readFile(credentialsConfigPath)
+      ).toString()
       expect(
-        configContent.indexOf(
+        credentialsContent.indexOf(
           `http.https://github.com/.extraheader AUTHORIZATION: basic ${basicCredential}`
         )
       ).toBeGreaterThanOrEqual(0)
@@ -484,7 +550,7 @@ describe('git-auth-helper tests', () => {
       settings.sshKey = ''
       const authHelper = gitAuthHelper.createAuthHelper(git, settings)
       await authHelper.configureAuth()
-      const mockSubmoduleForeach = git.submoduleForeach as jest.Mock<any, any>
+      const mockSubmoduleForeach = git.submoduleForeach as jest.Mock<any>
       mockSubmoduleForeach.mockClear() // reset calls
 
       // Act
@@ -517,7 +583,7 @@ describe('git-auth-helper tests', () => {
       settings.persistCredentials = false
       const authHelper = gitAuthHelper.createAuthHelper(git, settings)
       await authHelper.configureAuth()
-      const mockSubmoduleForeach = git.submoduleForeach as jest.Mock<any, any>
+      const mockSubmoduleForeach = git.submoduleForeach as jest.Mock<any>
       mockSubmoduleForeach.mockClear() // reset calls
 
       // Act
@@ -543,22 +609,22 @@ describe('git-auth-helper tests', () => {
       settings.sshKey = ''
       const authHelper = gitAuthHelper.createAuthHelper(git, settings)
       await authHelper.configureAuth()
-      const mockSubmoduleForeach = git.submoduleForeach as jest.Mock<any, any>
+      const mockSubmoduleForeach = git.submoduleForeach as jest.Mock<any>
       mockSubmoduleForeach.mockClear() // reset calls
 
       // Act
       await authHelper.configureSubmoduleAuth()
 
       // Assert
-      expect(mockSubmoduleForeach).toHaveBeenCalledTimes(4)
+      // Should configure insteadOf (2 calls for two values)
+      expect(mockSubmoduleForeach).toHaveBeenCalledTimes(3)
       expect(mockSubmoduleForeach.mock.calls[0][0]).toMatch(
         /unset-all.*insteadOf/
       )
-      expect(mockSubmoduleForeach.mock.calls[1][0]).toMatch(/http.*extraheader/)
+      expect(mockSubmoduleForeach.mock.calls[1][0]).toMatch(
-      expect(mockSubmoduleForeach.mock.calls[2][0]).toMatch(
         /url.*insteadOf.*git@github.com:/
       )
-      expect(mockSubmoduleForeach.mock.calls[3][0]).toMatch(
+      expect(mockSubmoduleForeach.mock.calls[2][0]).toMatch(
         /url.*insteadOf.*org-123456@github.com:/
       )
     }
@@ -582,19 +648,19 @@ describe('git-auth-helper tests', () => {
       )
       const authHelper = gitAuthHelper.createAuthHelper(git, settings)
       await authHelper.configureAuth()
-      const mockSubmoduleForeach = git.submoduleForeach as jest.Mock<any, any>
+      const mockSubmoduleForeach = git.submoduleForeach as jest.Mock<any>
       mockSubmoduleForeach.mockClear() // reset calls
 
       // Act
       await authHelper.configureSubmoduleAuth()
 
       // Assert
-      expect(mockSubmoduleForeach).toHaveBeenCalledTimes(3)
+      // Should configure sshCommand (1 call)
+      expect(mockSubmoduleForeach).toHaveBeenCalledTimes(2)
       expect(mockSubmoduleForeach.mock.calls[0][0]).toMatch(
         /unset-all.*insteadOf/
       )
-      expect(mockSubmoduleForeach.mock.calls[1][0]).toMatch(/http.*extraheader/)
+      expect(mockSubmoduleForeach.mock.calls[1][0]).toMatch(/core\.sshCommand/)
-      expect(mockSubmoduleForeach.mock.calls[2][0]).toMatch(/core\.sshCommand/)
     }
   )
 
@@ -660,19 +726,201 @@ describe('git-auth-helper tests', () => {
     await setup(removeAuth_removesToken)
     const authHelper = gitAuthHelper.createAuthHelper(git, settings)
     await authHelper.configureAuth()
-    let gitConfigContent = (
+
+    // Verify includeIf entries exist in local config
+    let localConfigContent = (
       await fs.promises.readFile(localGitConfigPath)
     ).toString()
-    expect(gitConfigContent.indexOf('http.')).toBeGreaterThanOrEqual(0) // sanity check
+    expect(
+      localConfigContent.indexOf('includeIf.gitdir:')
+    ).toBeGreaterThanOrEqual(0)
+
+    // Verify both host and container includeIf entries are present
+    const hostGitDir = path.join(workspace, '.git').replace(/\\/g, '/')
+    expect(
+      localConfigContent.indexOf(`includeIf.gitdir:${hostGitDir}.path`)
+    ).toBeGreaterThanOrEqual(0)
+    expect(
+      localConfigContent.indexOf('includeIf.gitdir:/github/workspace/.git.path')
+    ).toBeGreaterThanOrEqual(0)
+
+    // Verify credentials file exists
+    let credentialsFiles = (await fs.promises.readdir(runnerTemp)).filter(
+      f => f.startsWith('git-credentials-') && f.endsWith('.config')
+    )
+    expect(credentialsFiles.length).toBe(1)
+    const credentialsFilePath = path.join(runnerTemp, credentialsFiles[0])
+
+    // Verify credentials file contains the auth token
+    let credentialsContent = (
+      await fs.promises.readFile(credentialsFilePath)
+    ).toString()
+    const basicCredential = Buffer.from(
+      `x-access-token:${settings.authToken}`,
+      'utf8'
+    ).toString('base64')
+    expect(
+      credentialsContent.indexOf(
+        `http.https://github.com/.extraheader AUTHORIZATION: basic ${basicCredential}`
+      )
+    ).toBeGreaterThanOrEqual(0)
+
+    // Verify the includeIf entries point to the credentials file
+    const containerCredentialsPath = path.posix.join(
+      '/github/runner_temp',
+      path.basename(credentialsFilePath)
+    )
+    expect(
+      localConfigContent.indexOf(credentialsFilePath)
+    ).toBeGreaterThanOrEqual(0)
+    expect(
+      localConfigContent.indexOf(containerCredentialsPath)
+    ).toBeGreaterThanOrEqual(0)
 
     // Act
     await authHelper.removeAuth()
 
-    // Assert git config
+    // Assert all includeIf entries removed from local git config
-    gitConfigContent = (
+    localConfigContent = (
       await fs.promises.readFile(localGitConfigPath)
     ).toString()
-    expect(gitConfigContent.indexOf('http.')).toBeLessThan(0)
+    expect(localConfigContent.indexOf('includeIf.gitdir:')).toBeLessThan(0)
+    expect(
+      localConfigContent.indexOf(`includeIf.gitdir:${hostGitDir}.path`)
+    ).toBeLessThan(0)
+    expect(
+      localConfigContent.indexOf('includeIf.gitdir:/github/workspace/.git.path')
+    ).toBeLessThan(0)
+    expect(localConfigContent.indexOf(credentialsFilePath)).toBeLessThan(0)
+    expect(localConfigContent.indexOf(containerCredentialsPath)).toBeLessThan(0)
+
+    // Assert credentials config file deleted
+    credentialsFiles = (await fs.promises.readdir(runnerTemp)).filter(
+      f => f.startsWith('git-credentials-') && f.endsWith('.config')
+    )
+    expect(credentialsFiles.length).toBe(0)
+
+    // Verify credentials file no longer exists on disk
+    try {
+      await fs.promises.stat(credentialsFilePath)
+      throw new Error('Credentials file should have been deleted')
+    } catch (err) {
+      if ((err as any)?.code !== 'ENOENT') {
+        throw err
+      }
+    }
+  })
+
+  const removeAuth_removesTokenFromSubmodules =
+    'removeAuth removes token from submodules'
+  it(removeAuth_removesTokenFromSubmodules, async () => {
+    // Arrange
+    await setup(removeAuth_removesTokenFromSubmodules)
+
+    // Create fake submodule config paths
+    const submodule1Dir = path.join(workspace, '.git', 'modules', 'submodule-1')
+    const submodule2Dir = path.join(workspace, '.git', 'modules', 'submodule-2')
+    const submodule1ConfigPath = path.join(submodule1Dir, 'config')
+    const submodule2ConfigPath = path.join(submodule2Dir, 'config')
+
+    await fs.promises.mkdir(submodule1Dir, {recursive: true})
+    await fs.promises.mkdir(submodule2Dir, {recursive: true})
+    await fs.promises.writeFile(submodule1ConfigPath, '')
+    await fs.promises.writeFile(submodule2ConfigPath, '')
+
+    // Mock getSubmoduleConfigPaths to return our fake submodules (for both configure and remove)
+    const mockGetSubmoduleConfigPaths =
+      git.getSubmoduleConfigPaths as jest.Mock<any>
+    mockGetSubmoduleConfigPaths.mockResolvedValue([
+      submodule1ConfigPath,
+      submodule2ConfigPath
+    ])
+
+    const authHelper = gitAuthHelper.createAuthHelper(git, settings)
+    await authHelper.configureAuth()
+    await authHelper.configureSubmoduleAuth()
+
+    // Verify credentials file exists
+    let credentialsFiles = (await fs.promises.readdir(runnerTemp)).filter(
+      f => f.startsWith('git-credentials-') && f.endsWith('.config')
+    )
+    expect(credentialsFiles.length).toBe(1)
+    const credentialsFilePath = path.join(runnerTemp, credentialsFiles[0])
+
+    // Verify submodule 1 config has includeIf entries
+    let submodule1Content = (
+      await fs.promises.readFile(submodule1ConfigPath)
+    ).toString()
+    const submodule1GitDir = submodule1Dir.replace(/\\/g, '/')
+    expect(
+      submodule1Content.indexOf(`includeIf.gitdir:${submodule1GitDir}.path`)
+    ).toBeGreaterThanOrEqual(0)
+    expect(
+      submodule1Content.indexOf(credentialsFilePath)
+    ).toBeGreaterThanOrEqual(0)
+
+    // Verify submodule 2 config has includeIf entries
+    let submodule2Content = (
+      await fs.promises.readFile(submodule2ConfigPath)
+    ).toString()
+    const submodule2GitDir = submodule2Dir.replace(/\\/g, '/')
+    expect(
+      submodule2Content.indexOf(`includeIf.gitdir:${submodule2GitDir}.path`)
+    ).toBeGreaterThanOrEqual(0)
+    expect(
+      submodule2Content.indexOf(credentialsFilePath)
+    ).toBeGreaterThanOrEqual(0)
+
+    // Verify both host and container paths are in each submodule config
+    const containerCredentialsPath = path.posix.join(
+      '/github/runner_temp',
+      path.basename(credentialsFilePath)
+    )
+    expect(
+      submodule1Content.indexOf(containerCredentialsPath)
+    ).toBeGreaterThanOrEqual(0)
+    expect(
+      submodule2Content.indexOf(containerCredentialsPath)
+    ).toBeGreaterThanOrEqual(0)
+
+    // Act - ensure mock persists for removeAuth
+    mockGetSubmoduleConfigPaths.mockResolvedValue([
+      submodule1ConfigPath,
+      submodule2ConfigPath
+    ])
+    await authHelper.removeAuth()
+
+    // Assert submodule 1 includeIf entries removed
+    submodule1Content = (
+      await fs.promises.readFile(submodule1ConfigPath)
+    ).toString()
+    expect(submodule1Content.indexOf('includeIf.gitdir:')).toBeLessThan(0)
+    expect(submodule1Content.indexOf(credentialsFilePath)).toBeLessThan(0)
+    expect(submodule1Content.indexOf(containerCredentialsPath)).toBeLessThan(0)
+
+    // Assert submodule 2 includeIf entries removed
+    submodule2Content = (
+      await fs.promises.readFile(submodule2ConfigPath)
+    ).toString()
+    expect(submodule2Content.indexOf('includeIf.gitdir:')).toBeLessThan(0)
+    expect(submodule2Content.indexOf(credentialsFilePath)).toBeLessThan(0)
+    expect(submodule2Content.indexOf(containerCredentialsPath)).toBeLessThan(0)
+
+    // Assert credentials config file deleted
+    credentialsFiles = (await fs.promises.readdir(runnerTemp)).filter(
+      f => f.startsWith('git-credentials-') && f.endsWith('.config')
+    )
+    expect(credentialsFiles.length).toBe(0)
+
+    // Verify credentials file no longer exists on disk
+    try {
+      await fs.promises.stat(credentialsFilePath)
+      throw new Error('Credentials file should have been deleted')
+    } catch (err) {
+      if ((err as any)?.code !== 'ENOENT') {
+        throw err
+      }
+    }
   })
 
   const removeGlobalConfig_removesOverride =
@@ -701,6 +949,52 @@ describe('git-auth-helper tests', () => {
       }
     }
   })
+
+  const testCredentialsConfigPath_matchesCredentialsConfigPaths =
+    'testCredentialsConfigPath matches credentials config paths'
+  it(testCredentialsConfigPath_matchesCredentialsConfigPaths, async () => {
+    // Arrange
+    await setup(testCredentialsConfigPath_matchesCredentialsConfigPaths)
+    const authHelper = gitAuthHelper.createAuthHelper(git, settings)
+
+    // Get a real credentials config path
+    const credentialsConfigPath = await (
+      authHelper as any
+    ).getCredentialsConfigPath()
+
+    // Act & Assert
+    expect(
+      (authHelper as any).testCredentialsConfigPath(credentialsConfigPath)
+    ).toBe(true)
+    expect(
+      (authHelper as any).testCredentialsConfigPath(
+        '/some/path/git-credentials-12345678-abcd-1234-5678-123456789012.config'
+      )
+    ).toBe(true)
+    expect(
+      (authHelper as any).testCredentialsConfigPath(
+        '/some/path/git-credentials-abcdef12-3456-7890-abcd-ef1234567890.config'
+      )
+    ).toBe(true)
+
+    // Test invalid paths
+    expect(
+      (authHelper as any).testCredentialsConfigPath(
+        '/some/path/other-config.config'
+      )
+    ).toBe(false)
+    expect(
+      (authHelper as any).testCredentialsConfigPath(
+        '/some/path/git-credentials-invalid.config'
+      )
+    ).toBe(false)
+    expect(
+      (authHelper as any).testCredentialsConfigPath(
+        '/some/path/git-credentials-.config'
+      )
+    ).toBe(false)
+    expect((authHelper as any).testCredentialsConfigPath('')).toBe(false)
+  })
 })
 
 async function setup(testName: string): Promise<void> {
@@ -715,6 +1009,7 @@ async function setup(testName: string): Promise<void> {
   await fs.promises.mkdir(tempHomedir, {recursive: true})
   process.env['RUNNER_TEMP'] = runnerTemp
   process.env['HOME'] = tempHomedir
+  process.env['GITHUB_WORKSPACE'] = workspace
 
   // Create git config
   globalGitConfigPath = path.join(tempHomedir, '.gitconfig')
@@ -733,10 +1028,20 @@ async function setup(testName: string): Promise<void> {
     checkout: jest.fn(),
     checkoutDetach: jest.fn(),
     config: jest.fn(
-      async (key: string, value: string, globalConfig?: boolean) => {
+      async (
-        const configPath = globalConfig
+        key: string,
-          ? path.join(git.env['HOME'] || tempHomedir, '.gitconfig')
+        value: string,
-          : localGitConfigPath
+        globalConfig?: boolean,
+        add?: boolean,
+        configFile?: string
+      ) => {
+        const configPath =
+          configFile ||
+          (globalConfig
+            ? path.join(git.env['HOME'] || tempHomedir, '.gitconfig')
+            : localGitConfigPath)
+        // Ensure directory exists
+        await fs.promises.mkdir(path.dirname(configPath), {recursive: true})
         await fs.promises.appendFile(configPath, `\n${key} ${value}`)
       }
     ),
@@ -756,6 +1061,7 @@ async function setup(testName: string): Promise<void> {
     env: {},
     fetch: jest.fn(),
     getDefaultBranch: jest.fn(),
+    getSubmoduleConfigPaths: jest.fn(async () => []),
     getWorkingDirectory: jest.fn(() => workspace),
     init: jest.fn(),
     isDetached: jest.fn(),
@@ -794,11 +1100,75 @@ async function setup(testName: string): Promise<void> {
         return true
       }
     ),
+    tryConfigUnsetValue: jest.fn(
+      async (
+        key: string,
+        value: string,
+        globalConfig?: boolean,
+        configPath?: string
+      ): Promise<boolean> => {
+        const targetConfigPath =
+          configPath ||
+          (globalConfig
+            ? path.join(git.env['HOME'] || tempHomedir, '.gitconfig')
+            : localGitConfigPath)
+        let content = await fs.promises.readFile(targetConfigPath)
+        let lines = content
+          .toString()
+          .split('\n')
+          .filter(x => x)
+          .filter(x => !(x.startsWith(key) && x.includes(value)))
+        await fs.promises.writeFile(targetConfigPath, lines.join('\n'))
+        return true
+      }
+    ),
     tryDisableAutomaticGarbageCollection: jest.fn(),
     tryGetFetchUrl: jest.fn(),
+    tryGetConfigValues: jest.fn(
+      async (
+        key: string,
+        globalConfig?: boolean,
+        configPath?: string
+      ): Promise<string[]> => {
+        const targetConfigPath =
+          configPath ||
+          (globalConfig
+            ? path.join(git.env['HOME'] || tempHomedir, '.gitconfig')
+            : localGitConfigPath)
+        const content = await fs.promises.readFile(targetConfigPath)
+        const lines = content
+          .toString()
+          .split('\n')
+          .filter(x => x && x.startsWith(key))
+          .map(x => x.substring(key.length).trim())
+        return lines
+      }
+    ),
+    tryGetConfigKeys: jest.fn(
+      async (
+        pattern: string,
+        globalConfig?: boolean,
+        configPath?: string
+      ): Promise<string[]> => {
+        const targetConfigPath =
+          configPath ||
+          (globalConfig
+            ? path.join(git.env['HOME'] || tempHomedir, '.gitconfig')
+            : localGitConfigPath)
+        const content = await fs.promises.readFile(targetConfigPath)
+        const lines = content
+          .toString()
+          .split('\n')
+          .filter(x => x)
+        const keys = lines
+          .filter(x => new RegExp(pattern).test(x.split(' ')[0]))
+          .map(x => x.split(' ')[0])
+        return [...new Set(keys)] // Remove duplicates
+      }
+    ),
     tryReset: jest.fn(),
     version: jest.fn()
-  }
+  } as unknown as IGitCommandManager & {env: {[key: string]: string}}
 
   settings = {
     authToken: 'some auth token',
@@ -824,12 +1194,14 @@ async function setup(testName: string): Promise<void> {
     sshUser: '',
     workflowOrganizationId: 123456,
     setSafeDirectory: true,
-    githubServerUrl: githubServerUrl
+    githubServerUrl: githubServerUrl,
+    allowUnsafePrCheckout: false
   }
 }
 
 async function getActualSshKeyPath(): Promise<string> {
   let actualTempFiles = (await fs.promises.readdir(runnerTemp))
+    .filter(x => !x.startsWith('git-credentials-')) // Exclude credentials config file
     .sort()
     .map(x => path.join(runnerTemp, x))
   if (actualTempFiles.length === 0) {
@@ -843,6 +1215,7 @@ async function getActualSshKeyPath(): Promise<string> {
 
 async function getActualSshKnownHostsPath(): Promise<string> {
   let actualTempFiles = (await fs.promises.readdir(runnerTemp))
+    .filter(x => !x.startsWith('git-credentials-')) // Exclude credentials config file
     .sort()
     .map(x => path.join(runnerTemp, x))
   if (actualTempFiles.length === 0) {

__test__/git-command-manager.test.ts

@@ -1,26 +1,51 @@
-import * as exec from '@actions/exec'
+import {
-import * as fshelper from '../lib/fs-helper'
+  jest,
-import * as commandManager from '../lib/git-command-manager'
+  describe,
+  it,
+  expect,
+  beforeAll,
+  beforeEach,
+  afterEach,
+  afterAll
+} from '@jest/globals'
 
-let git: commandManager.IGitCommandManager
+// Mock @actions/exec
-let mockExec = jest.fn()
+const mockExec = jest.fn()
+jest.unstable_mockModule('@actions/exec', () => ({
+  exec: mockExec
+}))
+
+// Mock fs-helper
+const mockFileExistsSync = jest.fn()
+const mockDirectoryExistsSync = jest.fn()
+jest.unstable_mockModule('../src/fs-helper.js', () => ({
+  fileExistsSync: mockFileExistsSync,
+  directoryExistsSync: mockDirectoryExistsSync
+}))
+
+// Dynamic imports after mocking
+const commandManager = await import('../src/git-command-manager.js')
+type IGitCommandManager =
+  import('../src/git-command-manager.js').IGitCommandManager
+
+let git: IGitCommandManager
 
 describe('git-auth-helper tests', () => {
   beforeAll(async () => {})
 
   beforeEach(async () => {
-    jest.spyOn(fshelper, 'fileExistsSync').mockImplementation(jest.fn())
+    mockFileExistsSync.mockReset()
-    jest.spyOn(fshelper, 'directoryExistsSync').mockImplementation(jest.fn())
+    mockDirectoryExistsSync.mockReset()
   })
 
   afterEach(() => {
-    jest.restoreAllMocks()
+    jest.clearAllMocks()
   })
 
   afterAll(() => {})
 
   it('branch list matches', async () => {
-    mockExec.mockImplementation((path, args, options) => {
+    mockExec.mockImplementation((path: any, args: any, options: any) => {
       console.log(args, options.listeners.stdout)
 
       if (args.includes('version')) {
@@ -36,7 +61,7 @@ describe('git-auth-helper tests', () => {
 
       return 1
     })
-    jest.spyOn(exec, 'exec').mockImplementation(mockExec)
+    // exec.exec is already mockExec
     const workingDirectory = 'test'
     const lfs = false
     const doSparseCheckout = false
@@ -53,7 +78,7 @@ describe('git-auth-helper tests', () => {
   })
 
   it('ambiguous ref name output is captured', async () => {
-    mockExec.mockImplementation((path, args, options) => {
+    mockExec.mockImplementation((path: any, args: any, options: any) => {
       console.log(args, options.listeners.stdout)
 
       if (args.includes('version')) {
@@ -72,7 +97,7 @@ describe('git-auth-helper tests', () => {
 
       return 1
     })
-    jest.spyOn(exec, 'exec').mockImplementation(mockExec)
+    // exec.exec is already mockExec
     const workingDirectory = 'test'
     const lfs = false
     const doSparseCheckout = false
@@ -91,9 +116,9 @@ describe('git-auth-helper tests', () => {
 
 describe('Test fetchDepth and fetchTags options', () => {
   beforeEach(async () => {
-    jest.spyOn(fshelper, 'fileExistsSync').mockImplementation(jest.fn())
+    mockFileExistsSync.mockReset()
-    jest.spyOn(fshelper, 'directoryExistsSync').mockImplementation(jest.fn())
+    mockDirectoryExistsSync.mockReset()
-    mockExec.mockImplementation((path, args, options) => {
+    mockExec.mockImplementation((path: any, args: any, options: any) => {
       console.log(args, options.listeners.stdout)
 
       if (args.includes('version')) {
@@ -105,11 +130,11 @@ describe('Test fetchDepth and fetchTags options', () => {
   })
 
   afterEach(() => {
-    jest.restoreAllMocks()
+    jest.clearAllMocks()
   })
 
-  it('should call execGit with the correct arguments when fetchDepth is 0 and fetchTags is true', async () => {
+  it('should call execGit with the correct arguments when fetchDepth is 0', async () => {
-    jest.spyOn(exec, 'exec').mockImplementation(mockExec)
+    // exec.exec is already mockExec
     const workingDirectory = 'test'
     const lfs = false
     const doSparseCheckout = false
@@ -122,45 +147,7 @@ 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)
@@ -183,8 +170,46 @@ describe('Test fetchDepth and fetchTags options', () => {
     )
   })
 
-  it('should call execGit with the correct arguments when fetchDepth is 1 and fetchTags is false', async () => {
+  it('should call execGit with the correct arguments when fetchDepth is 0 and refSpec includes tags', async () => {
-    jest.spyOn(exec, 'exec').mockImplementation(mockExec)
+    // exec.exec is already 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 () => {
+    // exec.exec is already mockExec
 
     const workingDirectory = 'test'
     const lfs = false
@@ -197,8 +222,7 @@ 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)
@@ -222,8 +246,8 @@ describe('Test fetchDepth and fetchTags options', () => {
     )
   })
 
-  it('should call execGit with the correct arguments when fetchDepth is 1 and fetchTags is true', async () => {
+  it('should call execGit with the correct arguments when fetchDepth is 1 and refSpec includes tags', async () => {
-    jest.spyOn(exec, 'exec').mockImplementation(mockExec)
+    // exec.exec is already mockExec
 
     const workingDirectory = 'test'
     const lfs = false
@@ -233,11 +257,10 @@ describe('Test fetchDepth and fetchTags options', () => {
       lfs,
       doSparseCheckout
     )
-    const refSpec = ['refspec1', 'refspec2']
+    const refSpec = ['refspec1', 'refspec2', '+refs/tags/*:refs/tags/*']
     const options = {
       filter: 'filterValue',
-      fetchDepth: 1,
+      fetchDepth: 1
-      fetchTags: true
     }
 
     await git.fetch(refSpec, options)
@@ -248,20 +271,22 @@ describe('Test fetchDepth and fetchTags options', () => {
         '-c',
         'protocol.version=2',
         'fetch',
+        '--no-tags',
         '--prune',
         '--no-recurse-submodules',
         '--filter=filterValue',
         '--depth=1',
         'origin',
         'refspec1',
-        'refspec2'
+        'refspec2',
+        '+refs/tags/*:refs/tags/*'
       ],
       expect.any(Object)
     )
   })
 
   it('should call execGit with the correct arguments when showProgress is true', async () => {
-    jest.spyOn(exec, 'exec').mockImplementation(mockExec)
+    // exec.exec is already mockExec
 
     const workingDirectory = 'test'
     const lfs = false
@@ -299,7 +324,7 @@ describe('Test fetchDepth and fetchTags options', () => {
   })
 
   it('should call execGit with the correct arguments when fetchDepth is 42 and showProgress is true', async () => {
-    jest.spyOn(exec, 'exec').mockImplementation(mockExec)
+    // exec.exec is already mockExec
 
     const workingDirectory = 'test'
     const lfs = false
@@ -338,8 +363,8 @@ describe('Test fetchDepth and fetchTags options', () => {
     )
   })
 
-  it('should call execGit with the correct arguments when fetchTags is true and showProgress is true', async () => {
+  it('should call execGit with the correct arguments when showProgress is true and refSpec includes tags', async () => {
-    jest.spyOn(exec, 'exec').mockImplementation(mockExec)
+    // exec.exec is already mockExec
 
     const workingDirectory = 'test'
     const lfs = false
@@ -349,10 +374,9 @@ describe('Test fetchDepth and fetchTags options', () => {
       lfs,
       doSparseCheckout
     )
-    const refSpec = ['refspec1', 'refspec2']
+    const refSpec = ['refspec1', 'refspec2', '+refs/tags/*:refs/tags/*']
     const options = {
       filter: 'filterValue',
-      fetchTags: true,
       showProgress: true
     }
 
@@ -364,15 +388,187 @@ describe('Test fetchDepth and fetchTags options', () => {
         '-c',
         'protocol.version=2',
         'fetch',
+        '--no-tags',
         '--prune',
         '--no-recurse-submodules',
         '--progress',
         '--filter=filterValue',
         'origin',
         'refspec1',
-        'refspec2'
+        'refspec2',
+        '+refs/tags/*:refs/tags/*'
       ],
       expect.any(Object)
     )
   })
 })
+
+describe('repository initialization object format', () => {
+  beforeEach(async () => {
+    mockFileExistsSync.mockReset()
+    mockDirectoryExistsSync.mockReset()
+  })
+
+  afterEach(() => {
+    jest.clearAllMocks()
+  })
+
+  it('initializes SHA-256 repositories with the matching object format', async () => {
+    mockExec.mockImplementation((path: any, args: any, options: any) => {
+      if (args.includes('version')) {
+        options.listeners.stdout(Buffer.from('git version 2.50.1'))
+      }
+
+      return 0
+    })
+    // exec.exec is already 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: any, args: any, options: any) => {
+      if (args.includes('version')) {
+        options.listeners.stdout(Buffer.from('git version 2.50.1'))
+      }
+
+      return 0
+    })
+    // exec.exec is already 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 () => {
+    mockFileExistsSync.mockReset()
+    mockDirectoryExistsSync.mockReset()
+  })
+
+  afterEach(() => {
+    jest.clearAllMocks()
+    // 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: any, args: any, options: any) => {
+      if (args.includes('version')) {
+        options.listeners.stdout(Buffer.from('2.18'))
+      }
+      // Capture env on any command
+      capturedEnv = options.env
+      return 0
+    })
+    // exec.exec is already 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: any, args: any, options: any) => {
+      if (args.includes('version')) {
+        options.listeners.stdout(Buffer.from('2.18'))
+      }
+      // Capture env on any command
+      capturedEnv = options.env
+      return 0
+    })
+    // exec.exec is already 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: any, args: any, options: any) => {
+      if (args.includes('version')) {
+        options.listeners.stdout(Buffer.from('2.18'))
+      }
+      // Capture env on any command
+      capturedEnv = options.env
+      return 0
+    })
+    // exec.exec is already 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__/git-directory-helper.test.ts

@@ -1,9 +1,36 @@
-import * as core from '@actions/core'
+import {
+  jest,
+  describe,
+  it,
+  expect,
+  beforeAll,
+  beforeEach,
+  afterEach
+} from '@jest/globals'
 import * as fs from 'fs'
-import * as gitDirectoryHelper from '../lib/git-directory-helper'
 import * as io from '@actions/io'
 import * as path from 'path'
-import {IGitCommandManager} from '../lib/git-command-manager'
+import {fileURLToPath} from 'url'
+
+const __dirname = path.dirname(fileURLToPath(import.meta.url))
+
+// Mock @actions/core before loading git-directory-helper
+jest.unstable_mockModule('@actions/core', () => ({
+  error: jest.fn(),
+  warning: jest.fn(),
+  info: jest.fn(),
+  debug: jest.fn(),
+  setFailed: jest.fn(),
+  startGroup: jest.fn(),
+  endGroup: jest.fn()
+}))
+
+// Dynamic imports after mocking
+const core = await import('@actions/core')
+const gitDirectoryHelper = await import('../src/git-directory-helper.js')
+
+type IGitCommandManager =
+  import('../src/git-command-manager.js').IGitCommandManager
 
 const testWorkspace = path.join(__dirname, '_temp', 'git-directory-helper')
 let repositoryPath: string
@@ -19,16 +46,11 @@ describe('git-directory-helper tests', () => {
   })
 
   beforeEach(() => {
-    // Mock error/warning/info/debug
+    jest.clearAllMocks()
-    jest.spyOn(core, 'error').mockImplementation(jest.fn())
-    jest.spyOn(core, 'warning').mockImplementation(jest.fn())
-    jest.spyOn(core, 'info').mockImplementation(jest.fn())
-    jest.spyOn(core, 'debug').mockImplementation(jest.fn())
   })
 
   afterEach(() => {
-    // Unregister mocks
+    jest.clearAllMocks()
-    jest.restoreAllMocks()
   })
 
   const cleansWhenCleanTrue = 'cleans when clean true'
@@ -81,7 +103,7 @@ describe('git-directory-helper tests', () => {
     // Arrange
     await setup(doesNotCheckoutDetachWhenNotAlreadyDetached)
     await fs.promises.writeFile(path.join(repositoryPath, 'my-file'), '')
-    const mockIsDetached = git.isDetached as jest.Mock<any, any>
+    const mockIsDetached = git.isDetached as jest.Mock<any>
     mockIsDetached.mockImplementation(async () => {
       return true
     })
@@ -132,7 +154,7 @@ describe('git-directory-helper tests', () => {
     // Arrange
     await setup(removesContentsWhenCleanFails)
     await fs.promises.writeFile(path.join(repositoryPath, 'my-file'), '')
-    let mockTryClean = git.tryClean as jest.Mock<any, any>
+    let mockTryClean = git.tryClean as jest.Mock<any>
     mockTryClean.mockImplementation(async () => {
       return false
     })
@@ -210,7 +232,7 @@ describe('git-directory-helper tests', () => {
     // Arrange
     await setup(removesContentsWhenResetFails)
     await fs.promises.writeFile(path.join(repositoryPath, 'my-file'), '')
-    let mockTryReset = git.tryReset as jest.Mock<any, any>
+    let mockTryReset = git.tryReset as jest.Mock<any>
     mockTryReset.mockImplementation(async () => {
       return false
     })
@@ -260,7 +282,7 @@ describe('git-directory-helper tests', () => {
     // Arrange
     await setup(removesLocalBranches)
     await fs.promises.writeFile(path.join(repositoryPath, 'my-file'), '')
-    const mockBranchList = git.branchList as jest.Mock<any, any>
+    const mockBranchList = git.branchList as jest.Mock<any>
     mockBranchList.mockImplementation(async (remote: boolean) => {
       return remote ? [] : ['local-branch-1', 'local-branch-2']
     })
@@ -291,7 +313,7 @@ describe('git-directory-helper tests', () => {
 
     //mock bad submodule
 
-    const submoduleStatus = git.submoduleStatus as jest.Mock<any, any>
+    const submoduleStatus = git.submoduleStatus as jest.Mock<any>
     submoduleStatus.mockImplementation(async (remote: boolean) => {
       return false
     })
@@ -319,7 +341,7 @@ describe('git-directory-helper tests', () => {
     await setup(doesNotCleanWhenSubmoduleStatusIsTrue)
     await fs.promises.writeFile(path.join(repositoryPath, 'my-file'), '')
 
-    const submoduleStatus = git.submoduleStatus as jest.Mock<any, any>
+    const submoduleStatus = git.submoduleStatus as jest.Mock<any>
     submoduleStatus.mockImplementation(async (remote: boolean) => {
       return true
     })
@@ -381,7 +403,7 @@ describe('git-directory-helper tests', () => {
     // Arrange
     await setup(removesAncestorRemoteBranch)
     await fs.promises.writeFile(path.join(repositoryPath, 'my-file'), '')
-    const mockBranchList = git.branchList as jest.Mock<any, any>
+    const mockBranchList = git.branchList as jest.Mock<any>
     mockBranchList.mockImplementation(async (remote: boolean) => {
       return remote ? ['origin/remote-branch-1', 'origin/remote-branch-2'] : []
     })
@@ -411,7 +433,7 @@ describe('git-directory-helper tests', () => {
     // Arrange
     await setup(removesDescendantRemoteBranches)
     await fs.promises.writeFile(path.join(repositoryPath, 'my-file'), '')
-    const mockBranchList = git.branchList as jest.Mock<any, any>
+    const mockBranchList = git.branchList as jest.Mock<any>
     mockBranchList.mockImplementation(async (remote: boolean) => {
       return remote
         ? ['origin/remote-branch-1/conflict', 'origin/remote-branch-2']
@@ -471,6 +493,7 @@ async function setup(testName: string): Promise<void> {
     configExists: jest.fn(),
     fetch: jest.fn(),
     getDefaultBranch: jest.fn(),
+    getSubmoduleConfigPaths: jest.fn(async () => []),
     getWorkingDirectory: jest.fn(() => repositoryPath),
     init: jest.fn(),
     isDetached: jest.fn(),
@@ -493,15 +516,18 @@ async function setup(testName: string): Promise<void> {
       return true
     }),
     tryConfigUnset: jest.fn(),
+    tryConfigUnsetValue: jest.fn(),
     tryDisableAutomaticGarbageCollection: jest.fn(),
     tryGetFetchUrl: jest.fn(async () => {
       // Sanity check - this function shouldn't be called when the .git directory doesn't exist
       await fs.promises.stat(path.join(repositoryPath, '.git'))
       return repositoryUrl
     }),
+    tryGetConfigValues: jest.fn(),
+    tryGetConfigKeys: jest.fn(),
     tryReset: jest.fn(async () => {
       return true
     }),
     version: jest.fn()
-  }
+  } as unknown as IGitCommandManager
 }

__test__/git-version.test.ts

@@ -1,5 +1,6 @@
-import {GitVersion} from '../src/git-version'
+import {describe, it, expect} from '@jest/globals'
-import {MinimumGitSparseCheckoutVersion} from '../src/git-command-manager'
+import {GitVersion} from '../src/git-version.js'
+import {MinimumGitSparseCheckoutVersion} from '../src/git-command-manager.js'
 
 describe('git-version tests', () => {
   it('basics', async () => {

__test__/github-api-helper.test.ts

@@ -0,0 +1,112 @@
+import {jest, describe, it, expect, beforeEach, afterEach} from '@jest/globals'
+
+// Mock @actions/core
+const mockDebug = jest.fn()
+jest.unstable_mockModule('@actions/core', () => ({
+  debug: mockDebug,
+  info: jest.fn(),
+  warning: jest.fn(),
+  error: jest.fn()
+}))
+
+// Mock @actions/github
+const mockGetOctokit = jest.fn()
+jest.unstable_mockModule('@actions/github', () => ({
+  getOctokit: mockGetOctokit
+}))
+
+// Dynamic imports after mocking
+const githubApiHelper = await import('../src/github-api-helper.js')
+
+describe('github-api-helper object format', () => {
+  let request: jest.Mock<any>
+
+  function mockHashAlgorithmApi(hashAlgorithm: string): void {
+    request = jest.fn(async () => ({
+      data: {
+        hash_algorithm: hashAlgorithm
+      }
+    }))
+    mockGetOctokit.mockReturnValue({
+      request
+    } as any)
+  }
+
+  beforeEach(() => {
+    mockDebug.mockClear()
+    mockGetOctokit.mockClear()
+  })
+
+  afterEach(() => {
+    jest.clearAllMocks()
+  })
+
+  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(mockGetOctokit).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'
+
+    await expect(
+      githubApiHelper.tryGetRepositoryObjectFormat(
+        'token',
+        'owner',
+        'repo',
+        undefined,
+        commitSha
+      )
+    ).resolves.toEqual({format: 'sha256', succeeded: true})
+
+    expect(mockGetOctokit).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(mockDebug).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')
+    })
+    mockGetOctokit.mockReturnValue({
+      request
+    } as any)
+
+    await expect(
+      githubApiHelper.tryGetRepositoryObjectFormat('token', 'owner', 'repo')
+    ).resolves.toEqual({format: '', succeeded: false})
+    expect(mockDebug).toHaveBeenCalledWith(
+      'Unable to determine repository object format from hash-algorithm endpoint: not found'
+    )
+  })
+})

__test__/input-helper.test.ts

@@ -1,10 +1,13 @@
-import * as core from '@actions/core'
+import {
-import * as fsHelper from '../lib/fs-helper'
+  jest,
-import * as github from '@actions/github'
+  describe,
-import * as inputHelper from '../lib/input-helper'
+  it,
+  expect,
+  beforeAll,
+  beforeEach,
+  afterAll
+} from '@jest/globals'
 import * as path from 'path'
-import * as workflowContextHelper from '../lib/workflow-context-helper'
-import {IGitSourceSettings} from '../lib/git-source-settings'
 
 const originalGitHubWorkspace = process.env['GITHUB_WORKSPACE']
 const gitHubWorkspace = path.resolve('/checkout-tests/workspace')
@@ -12,42 +15,58 @@ const gitHubWorkspace = path.resolve('/checkout-tests/workspace')
 // Inputs for mock @actions/core
 let inputs = {} as any
 
-// Shallow clone original @actions/github context
+// Mutable mock github context
-let originalContext = {...github.context}
+const mockGithubContext: any = {
+  ref: 'refs/heads/some-ref',
+  sha: '1234567890123456789012345678901234567890',
+  repo: {owner: 'some-owner', repo: 'some-repo'},
+  eventName: '',
+  payload: {}
+}
+
+// Mock @actions/core before loading input-helper
+jest.unstable_mockModule('@actions/core', () => ({
+  getInput: jest.fn((name: string) => inputs[name]),
+  getBooleanInput: jest.fn((name: string) => inputs[name]),
+  getMultilineInput: jest.fn((name: string) =>
+    inputs[name] ? String(inputs[name]).split('\n').filter(Boolean) : []
+  ),
+  error: jest.fn(),
+  warning: jest.fn(),
+  info: jest.fn(),
+  debug: jest.fn(),
+  setFailed: jest.fn(),
+  setOutput: jest.fn(),
+  setSecret: jest.fn()
+}))
+
+// Mock @actions/github before loading input-helper
+jest.unstable_mockModule('@actions/github', () => ({
+  context: mockGithubContext,
+  getOctokit: jest.fn()
+}))
+
+// Mock fs-helper
+const mockDirectoryExistsSync = jest.fn((p: string) => p === gitHubWorkspace)
+jest.unstable_mockModule('../src/fs-helper.js', () => ({
+  directoryExistsSync: mockDirectoryExistsSync,
+  fileExistsSync: jest.fn()
+}))
+
+// Mock workflow-context-helper
+const mockGetOrganizationId = jest.fn(async () => 123456)
+jest.unstable_mockModule('../src/workflow-context-helper.js', () => ({
+  getOrganizationId: mockGetOrganizationId
+}))
+
+// Dynamic imports after mocking
+const core = await import('@actions/core')
+const inputHelper = await import('../src/input-helper.js')
+type IGitSourceSettings =
+  import('../src/git-source-settings.js').IGitSourceSettings
 
 describe('input-helper tests', () => {
   beforeAll(() => {
-    // Mock getInput
-    jest.spyOn(core, 'getInput').mockImplementation((name: string) => {
-      return inputs[name]
-    })
-
-    // Mock error/warning/info/debug
-    jest.spyOn(core, 'error').mockImplementation(jest.fn())
-    jest.spyOn(core, 'warning').mockImplementation(jest.fn())
-    jest.spyOn(core, 'info').mockImplementation(jest.fn())
-    jest.spyOn(core, 'debug').mockImplementation(jest.fn())
-
-    // Mock github context
-    jest.spyOn(github.context, 'repo', 'get').mockImplementation(() => {
-      return {
-        owner: 'some-owner',
-        repo: 'some-repo'
-      }
-    })
-    github.context.ref = 'refs/heads/some-ref'
-    github.context.sha = '1234567890123456789012345678901234567890'
-
-    // Mock ./fs-helper directoryExistsSync()
-    jest
-      .spyOn(fsHelper, 'directoryExistsSync')
-      .mockImplementation((path: string) => path == gitHubWorkspace)
-
-    // Mock ./workflowContextHelper getOrganizationId()
-    jest
-      .spyOn(workflowContextHelper, 'getOrganizationId')
-      .mockImplementation(() => Promise.resolve(123456))
-
     // GitHub workspace
     process.env['GITHUB_WORKSPACE'] = gitHubWorkspace
   })
@@ -55,6 +74,15 @@ describe('input-helper tests', () => {
   beforeEach(() => {
     // Reset inputs
     inputs = {}
+    jest.clearAllMocks()
+    // Re-apply default mocks
+    ;(core.getInput as jest.Mock<any>).mockImplementation(
+      (name: string) => inputs[name]
+    )
+    mockDirectoryExistsSync.mockImplementation(
+      (p: string) => p === gitHubWorkspace
+    )
+    mockGetOrganizationId.mockResolvedValue(123456)
   })
 
   afterAll(() => {
@@ -65,11 +93,8 @@ describe('input-helper tests', () => {
     }
 
     // Restore @actions/github context
-    github.context.ref = originalContext.ref
+    mockGithubContext.ref = 'refs/heads/some-ref'
-    github.context.sha = originalContext.sha
+    mockGithubContext.sha = '1234567890123456789012345678901234567890'
-
-    // Restore
-    jest.restoreAllMocks()
   })
 
   it('sets defaults', async () => {
@@ -91,18 +116,19 @@ 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 () => {
-    let originalRef = github.context.ref
+    let originalRef = mockGithubContext.ref
     try {
-      github.context.ref = 'some-unqualified-ref'
+      mockGithubContext.ref = 'some-unqualified-ref'
       const settings: IGitSourceSettings = await inputHelper.getInputs()
       expect(settings).toBeTruthy()
       expect(settings.commit).toBe('1234567890123456789012345678901234567890')
       expect(settings.ref).toBe('refs/heads/some-unqualified-ref')
     } finally {
-      github.context.ref = originalRef
+      mockGithubContext.ref = originalRef
     }
   })
 
@@ -133,6 +159,16 @@ 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

@@ -1,13 +1,46 @@
+import {jest, describe, it, expect, beforeEach, afterEach} from '@jest/globals'
 import * as assert from 'assert'
-import * as refHelper from '../lib/ref-helper'
+
-import {IGitCommandManager} from '../lib/git-command-manager'
+// Mutable mock github context
+const mockGithubContext: any = {
+  eventName: '',
+  payload: {},
+  repo: {owner: 'some-owner', repo: 'some-repo'},
+  ref: '',
+  sha: ''
+}
+
+// Mock @actions/core
+const mockDebug = jest.fn()
+jest.unstable_mockModule('@actions/core', () => ({
+  debug: mockDebug,
+  info: jest.fn(),
+  warning: jest.fn(),
+  error: jest.fn(),
+  setFailed: jest.fn()
+}))
+
+// Mock @actions/github
+const mockGetOctokit = jest.fn()
+jest.unstable_mockModule('@actions/github', () => ({
+  context: mockGithubContext,
+  getOctokit: mockGetOctokit
+}))
+
+// Dynamic imports after mocking
+const refHelper = await import('../src/ref-helper.js')
+type IGitCommandManager =
+  import('../src/git-command-manager.js').IGitCommandManager
 
 const commit = '1234567890123456789012345678901234567890'
+const sha256Commit =
+  '1234567890123456789012345678901234567890123456789012345678901234'
 let git: IGitCommandManager
 
 describe('ref-helper tests', () => {
   beforeEach(() => {
     git = {} as unknown as IGitCommandManager
+    jest.clearAllMocks()
   })
 
   it('getCheckoutInfo requires git', async () => {
@@ -37,6 +70,12 @@ 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,
@@ -152,7 +191,20 @@ 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(`+${commit}:refs/tags/my-tag`)
+    expect(refSpec[0]).toBe(`+refs/tags/my-tag:refs/tags/my-tag`)
+  })
+
+  it('getRefSpec sha + refs/tags/ with fetchTags', async () => {
+    const refSpec = refHelper.getRefSpec('refs/tags/my-tag', commit, true)
+    expect(refSpec.length).toBe(1)
+    expect(refSpec[0]).toBe('+refs/tags/*:refs/tags/*')
+  })
+
+  it('getRefSpec sha + refs/heads/ with fetchTags', async () => {
+    const refSpec = refHelper.getRefSpec('refs/heads/my/branch', commit, true)
+    expect(refSpec.length).toBe(2)
+    expect(refSpec[0]).toBe('+refs/tags/*:refs/tags/*')
+    expect(refSpec[1]).toBe(`+${commit}:refs/remotes/origin/my/branch`)
   })
 
   it('getRefSpec sha only', async () => {
@@ -168,6 +220,13 @@ describe('ref-helper tests', () => {
     expect(refSpec[1]).toBe('+refs/tags/my-ref*:refs/tags/my-ref*')
   })
 
+  it('getRefSpec unqualified ref only with fetchTags', async () => {
+    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)
@@ -187,4 +246,155 @@ 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 () => {
+    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 () => {
+    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 repoGetSpy: jest.Mock<any>
+    let originalEventName: string
+    let originalPayload: unknown
+    let originalRef: string
+    let originalSha: string
+
+    function setPullRequestContext(
+      expectedHeadSha: string,
+      expectedBaseSha: string,
+      mergeCommit: string
+    ): void {
+      mockGithubContext.eventName = 'pull_request'
+      mockGithubContext.ref = ref
+      mockGithubContext.sha = mergeCommit
+      mockGithubContext.payload = {
+        action: 'synchronize',
+        after: expectedHeadSha,
+        number: 123,
+        pull_request: {
+          base: {
+            sha: expectedBaseSha
+          }
+        },
+        repository: {
+          private: false
+        }
+      }
+    }
+
+    beforeEach(() => {
+      originalEventName = mockGithubContext.eventName
+      originalPayload = mockGithubContext.payload
+      originalRef = mockGithubContext.ref
+      originalSha = mockGithubContext.sha
+
+      mockGithubContext.repo = {
+        owner: repositoryOwner,
+        repo: repositoryName
+      }
+
+      repoGetSpy = jest.fn(async () => ({}))
+      mockGetOctokit.mockReturnValue({
+        rest: {
+          repos: {
+            get: repoGetSpy
+          }
+        }
+      } as any)
+    })
+
+    afterEach(() => {
+      mockGithubContext.eventName = originalEventName
+      mockGithubContext.payload = originalPayload
+      mockGithubContext.ref = originalRef
+      mockGithubContext.sha = originalSha
+      jest.clearAllMocks()
+    })
+
+    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(mockGetOctokit).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 ${sha256Base}`,
+        repositoryOwner,
+        repositoryName,
+        ref,
+        sha256Commit
+      )
+
+      expect(mockGetOctokit).toHaveBeenCalledWith(
+        'token',
+        expect.objectContaining({
+          userAgent: expect.stringContaining(
+            `expected_head_sha=${sha256Head};actual_head_sha=${actualHeadSha}`
+          )
+        })
+      )
+      expect(repoGetSpy).toHaveBeenCalledWith({
+        owner: repositoryOwner,
+        repo: repositoryName
+      })
+      expect(mockDebug).toHaveBeenCalledWith(
+        `Expected head sha ${sha256Head}; actual head sha ${actualHeadSha}`
+      )
+      expect(mockDebug).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(mockGetOctokit).not.toHaveBeenCalled()
+      expect(repoGetSpy).not.toHaveBeenCalled()
+      expect(mockDebug).toHaveBeenCalledWith('Unexpected message format')
+    })
+  })
 })

__test__/retry-helper.test.ts

@@ -1,16 +1,32 @@
-import * as core from '@actions/core'
+import {
-import {RetryHelper} from '../lib/retry-helper'
+  jest,
+  describe,
+  it,
+  expect,
+  beforeAll,
+  beforeEach,
+  afterAll
+} from '@jest/globals'
+
+let info: string[] = []
+
+// Mock @actions/core before loading retry-helper
+jest.unstable_mockModule('@actions/core', () => ({
+  info: jest.fn((message: string) => {
+    info.push(message)
+  }),
+  debug: jest.fn(),
+  warning: jest.fn(),
+  error: jest.fn()
+}))
+
+// Dynamic imports after mocking
+const {RetryHelper} = await import('../src/retry-helper.js')
 
-let info: string[]
 let retryHelper: any
 
 describe('retry-helper tests', () => {
   beforeAll(() => {
-    // Mock @actions/core info()
-    jest.spyOn(core, 'info').mockImplementation((message: string) => {
-      info.push(message)
-    })
-
     retryHelper = new RetryHelper(3, 0, 0)
   })
 
@@ -20,7 +36,6 @@ describe('retry-helper tests', () => {
   })
 
   afterAll(() => {
-    // Restore
     jest.restoreAllMocks()
   })
 

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

@@ -0,0 +1,285 @@
+import {
+  jest,
+  describe,
+  it,
+  expect,
+  beforeAll,
+  afterEach,
+  afterAll
+} from '@jest/globals'
+
+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'
+
+// Mutable mock context
+const mockContext: any = {
+  eventName: '',
+  payload: {},
+  repo: {owner: 'some-owner', repo: 'some-repo'},
+  ref: '',
+  sha: ''
+}
+
+jest.unstable_mockModule('@actions/github', () => ({
+  context: mockContext
+}))
+
+// Dynamic imports after mocking
+const {assertSafePrCheckout} = await import(
+  '../src/unsafe-pr-checkout-helper.js'
+)
+
+const originalEventName = mockContext.eventName
+const originalPayload = mockContext.payload
+
+function setContext(eventName: string, payload: object): void {
+  mockContext.eventName = eventName
+  mockContext.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(() => {
+    mockContext.repo = {owner: 'some-owner', repo: 'some-repo'}
+  })
+
+  afterEach(() => {
+    mockContext.eventName = originalEventName
+    mockContext.payload = originalPayload
+  })
+
+  afterAll(() => {
+    mockContext.eventName = originalEventName
+    mockContext.payload = originalPayload
+  })
+
+  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__/url-helper.test.ts

@@ -1,4 +1,5 @@
-import * as urlHelper from '../src/url-helper'
+import {jest, describe, it, expect, beforeEach, afterAll} from '@jest/globals'
+import * as urlHelper from '../src/url-helper.js'
 
 describe('getServerUrl tests', () => {
   it('basics', async () => {

__test__/verify-fetch-tags.sh

@@ -0,0 +1,9 @@
+#!/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"

__test__/verify-submodules-recursive.sh

@@ -17,7 +17,7 @@ fi
 
 echo "Testing persisted credential"
 pushd ./submodules-recursive/submodule-level-1/submodule-level-2
-git config --local --name-only --get-regexp http.+extraheader && git fetch
+git config --local --includes --name-only --get-regexp http.+extraheader && git fetch
 if [ "$?" != "0" ]; then
     echo "Failed to validate persisted credential"
     popd

__test__/verify-submodules-true.sh

@@ -17,7 +17,7 @@ fi
 
 echo "Testing persisted credential"
 pushd ./submodules-true/submodule-level-1
-git config --local --name-only --get-regexp http.+extraheader && git fetch
+git config --local --includes --name-only --get-regexp http.+extraheader && git fetch
 if [ "$?" != "0" ]; then
     echo "Failed to validate persisted credential"
     popd

__test__/verify-worktree.sh

@@ -0,0 +1,51 @@
+#!/bin/bash
+set -e
+
+# Verify worktree credentials
+# This test verifies that git credentials work in worktrees created after checkout
+# Usage: verify-worktree.sh <checkout-path> <worktree-name>
+
+CHECKOUT_PATH="$1"
+WORKTREE_NAME="$2"
+
+if [ -z "$CHECKOUT_PATH" ] || [ -z "$WORKTREE_NAME" ]; then
+  echo "Usage: verify-worktree.sh <checkout-path> <worktree-name>"
+  exit 1
+fi
+
+cd "$CHECKOUT_PATH"
+
+# Add safe directory for container environments
+git config --global --add safe.directory "*" 2>/dev/null || true
+
+# Show the includeIf configuration
+echo "Git config includeIf entries:"
+git config --list --show-origin | grep -i include || true
+
+# Create the worktree
+echo "Creating worktree..."
+git worktree add "../$WORKTREE_NAME" HEAD --detach
+
+# Change to worktree directory
+cd "../$WORKTREE_NAME"
+
+# Verify we're in a worktree
+echo "Verifying worktree gitdir:"
+cat .git
+
+# Verify credentials are available in worktree by checking extraheader is configured
+echo "Checking credentials in worktree..."
+if git config --list --show-origin | grep -q "extraheader"; then
+  echo "Credentials are configured in worktree"
+else
+  echo "ERROR: Credentials are NOT configured in worktree"
+  echo "Full git config:"
+  git config --list --show-origin
+  exit 1
+fi
+
+# Verify fetch works in the worktree
+echo "Fetching in worktree..."
+git fetch origin
+
+echo "Worktree credentials test passed!"

action.yml

@@ -98,12 +98,21 @@ 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'
   commit:
     description: 'The commit SHA that was checked out'
 runs:
-  using: node20
+  using: node24
   main: dist/index.js
   post: dist/index.js

dist/package.json

@@ -0,0 +1,3 @@
+{
+  "type": "module"
+}

jest.config.js

@@ -1,12 +0,0 @@
-module.exports = {
-  clearMocks: true,
-  fakeTimers: {},
-  moduleFileExtensions: ['js', 'ts'],
-  testEnvironment: 'node',
-  testMatch: ['**/*.test.ts'],
-  testRunner: 'jest-circus/runner',
-  transform: {
-    '^.+\\.ts$': 'ts-jest'
-  },
-  verbose: true
-}

jest.config.ts

@@ -0,0 +1,24 @@
+export default {
+  clearMocks: true,
+  moduleFileExtensions: ['js', 'ts'],
+  roots: ['<rootDir>'],
+  testEnvironment: 'node',
+  testMatch: ['**/*.test.ts'],
+  transform: {
+    '^.+\\.ts$': [
+      'ts-jest',
+      {
+        useESM: true,
+        diagnostics: {
+          ignoreCodes: [151002]
+        }
+      }
+    ]
+  },
+  extensionsToTreatAsEsm: ['.ts'],
+  transformIgnorePatterns: ['node_modules/(?!(@actions)/)'],
+  moduleNameMapper: {
+    '^(\\.{1,2}/.*)\\.js$': '$1'
+  },
+  verbose: true
+}

package-lock.json

@@ -1,37 +1,38 @@
 {
   "name": "checkout",
-  "version": "4.3.0",
+  "version": "5.0.0",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "checkout",
-      "version": "4.3.0",
+      "version": "5.0.0",
       "license": "MIT",
       "dependencies": {
-        "@actions/core": "^1.10.1",
+        "@actions/core": "^3.0.1",
-        "@actions/exec": "^1.1.1",
+        "@actions/exec": "^3.0.0",
-        "@actions/github": "^6.0.0",
+        "@actions/github": "^9.1.1",
-        "@actions/io": "^1.1.3",
+        "@actions/io": "^3.0.2",
-        "@actions/tool-cache": "^2.0.1",
+        "@actions/tool-cache": "^4.0.0"
-        "uuid": "^9.0.1"
       },
       "devDependencies": {
         "@types/jest": "^29.5.12",
-        "@types/node": "^20.12.12",
+        "@types/node": "^24.1.0",
-        "@types/uuid": "^9.0.8",
         "@typescript-eslint/eslint-plugin": "^7.9.0",
         "@typescript-eslint/parser": "^7.9.0",
-        "@vercel/ncc": "^0.38.1",
+        "@vercel/ncc": "^0.38.4",
         "eslint": "^8.57.0",
         "eslint-plugin-github": "^4.10.2",
         "eslint-plugin-jest": "^28.8.2",
         "jest": "^29.7.0",
-        "jest-circus": "^29.7.0",
+        "js-yaml": "^4.2.0",
-        "js-yaml": "^4.1.0",
         "prettier": "^3.3.3",
         "ts-jest": "^29.2.5",
+        "ts-node": "^10.9.2",
         "typescript": "^5.5.4"
+      },
+      "engines": {
+        "node": ">=24"
       }
     },
     "node_modules/@aashutoshrathi/word-wrap": {
@@ -44,75 +45,88 @@
       }
     },
     "node_modules/@actions/core": {
-      "version": "1.10.1",
+      "version": "3.0.1",
-      "resolved": "https://registry.npmjs.org/@actions/core/-/core-1.10.1.tgz",
+      "resolved": "https://registry.npmjs.org/@actions/core/-/core-3.0.1.tgz",
-      "integrity": "sha512-3lBR9EDAY+iYIpTnTIXmWcNbX3T2kCkAEQGIQx4NVQ0575nk2k3GRZDTPQG+vVtS2izSLmINlxXf0uLtnrTP+g==",
+      "integrity": "sha512-a6d/Nwahm9fliVGRhdhofo40HjHQasUPusmc7vBfyky+7Z+P2A1J68zyFVaNcEclc/Se+eO595oAr5nwEIoIUA==",
+      "license": "MIT",
       "dependencies": {
-        "@actions/http-client": "^2.0.1",
+        "@actions/exec": "^3.0.0",
-        "uuid": "^8.3.2"
+        "@actions/http-client": "^4.0.0"
-      }
-    },
-    "node_modules/@actions/core/node_modules/uuid": {
-      "version": "8.3.2",
-      "resolved": "https://registry.npmjs.org/uuid/-/uuid-8.3.2.tgz",
-      "integrity": "sha512-+NYs2QeMWy+GWFOEm9xnn6HCDp0l7QBD7ml8zLUmJ+93Q5NF0NocErnwkTkXVFNiX3/fpC6afS8Dhb/gz7R7eg==",
-      "bin": {
-        "uuid": "dist/bin/uuid"
       }
     },
     "node_modules/@actions/exec": {
-      "version": "1.1.1",
+      "version": "3.0.0",
-      "resolved": "https://registry.npmjs.org/@actions/exec/-/exec-1.1.1.tgz",
+      "resolved": "https://registry.npmjs.org/@actions/exec/-/exec-3.0.0.tgz",
-      "integrity": "sha512-+sCcHHbVdk93a0XT19ECtO/gIXoxvdsgQLzb2fE2/5sIZmWQuluYyjPQtrtTHdU1YzTZ7bAPN4sITq2xi1679w==",
+      "integrity": "sha512-6xH/puSoNBXb72VPlZVm7vQ+svQpFyA96qdDBvhB8eNZOE8LtPf9L4oAsfzK/crCL8YZ+19fKYVnM63Sl+Xzlw==",
+      "license": "MIT",
       "dependencies": {
-        "@actions/io": "^1.0.1"
+        "@actions/io": "^3.0.2"
       }
     },
     "node_modules/@actions/github": {
-      "version": "6.0.0",
+      "version": "9.1.1",
-      "resolved": "https://registry.npmjs.org/@actions/github/-/github-6.0.0.tgz",
+      "resolved": "https://registry.npmjs.org/@actions/github/-/github-9.1.1.tgz",
-      "integrity": "sha512-alScpSVnYmjNEXboZjarjukQEzgCRmjMv6Xj47fsdnqGS73bjJNDpiiXmp8jr0UZLdUB6d9jW63IcmddUP+l0g==",
+      "integrity": "sha512-tL5JbYOBZHc0ngEnCsaDcryUizIUIlQyIMwy1Wkx93H5HzbBJ7TbiPx2PnFjBwZW0Vh05JmfFZhecE6gglYegA==",
+      "license": "MIT",
       "dependencies": {
-        "@actions/http-client": "^2.2.0",
+        "@actions/http-client": "^3.0.2",
-        "@octokit/core": "^5.0.1",
+        "@octokit/core": "^7.0.6",
-        "@octokit/plugin-paginate-rest": "^9.0.0",
+        "@octokit/plugin-paginate-rest": "^14.0.0",
-        "@octokit/plugin-rest-endpoint-methods": "^10.0.0"
+        "@octokit/plugin-rest-endpoint-methods": "^17.0.0",
+        "@octokit/request": "^10.0.7",
+        "@octokit/request-error": "^7.1.0",
+        "undici": "^6.23.0"
+      }
+    },
+    "node_modules/@actions/github/node_modules/@actions/http-client": {
+      "version": "3.0.2",
+      "resolved": "https://registry.npmjs.org/@actions/http-client/-/http-client-3.0.2.tgz",
+      "integrity": "sha512-JP38FYYpyqvUsz+Igqlc/JG6YO9PaKuvqjM3iGvaLqFnJ7TFmcLyy2IDrY0bI0qCQug8E9K+elv5ZNfw62ZJzA==",
+      "license": "MIT",
+      "dependencies": {
+        "tunnel": "^0.0.6",
+        "undici": "^6.23.0"
       }
     },
     "node_modules/@actions/http-client": {
-      "version": "2.2.1",
+      "version": "4.0.1",
-      "resolved": "https://registry.npmjs.org/@actions/http-client/-/http-client-2.2.1.tgz",
+      "resolved": "https://registry.npmjs.org/@actions/http-client/-/http-client-4.0.1.tgz",
-      "integrity": "sha512-KhC/cZsq7f8I4LfZSJKgCvEwfkE8o1538VoBeoGzokVLLnbFDEAdFD3UhoMklxo2un9NJVBdANOresx7vTHlHw==",
+      "integrity": "sha512-+Nvd1ImaOZBSoPbsUtEhv+1z99H12xzncCkz0a3RuehINE81FZSe2QTj3uvAPTcJX/SCzUQHQ0D1GrPMbrPitg==",
+      "license": "MIT",
       "dependencies": {
         "tunnel": "^0.0.6",
-        "undici": "^5.25.4"
+        "undici": "^6.23.0"
       }
     },
     "node_modules/@actions/io": {
-      "version": "1.1.3",
+      "version": "3.0.2",
-      "resolved": "https://registry.npmjs.org/@actions/io/-/io-1.1.3.tgz",
+      "resolved": "https://registry.npmjs.org/@actions/io/-/io-3.0.2.tgz",
-      "integrity": "sha512-wi9JjgKLYS7U/z8PPbco+PvTb/nRWjeoFlJ1Qer83k/3C5PHQi28hiVdeE2kHXmIL99mQFawx8qt/JPjZilJ8Q=="
+      "integrity": "sha512-nRBchcMM+QK1pdjO7/idu86rbJI5YHUKCvKs0KxnSYbVe3F51UfGxuZX4Qy/fWlp6l7gWFwIkrOzN+oUK03kfw==",
+      "license": "MIT"
     },
     "node_modules/@actions/tool-cache": {
-      "version": "2.0.1",
+      "version": "4.0.0",
-      "resolved": "https://registry.npmjs.org/@actions/tool-cache/-/tool-cache-2.0.1.tgz",
+      "resolved": "https://registry.npmjs.org/@actions/tool-cache/-/tool-cache-4.0.0.tgz",
-      "integrity": "sha512-iPU+mNwrbA8jodY8eyo/0S/QqCKDajiR8OxWTnSk/SnYg0sj8Hp4QcUEVC1YFpHWXtrfbQrE13Jz4k4HXJQKcA==",
+      "integrity": "sha512-L8P9HbXvpvqjZDveb/fdsa55IVC0trfPgQ4ZwGo6r5af6YDVdM9vMGPZ7rgY2fAT9gGj4PSYd6bYlg3p3jD78A==",
+      "license": "MIT",
       "dependencies": {
-        "@actions/core": "^1.2.6",
+        "@actions/core": "^3.0.0",
-        "@actions/exec": "^1.0.0",
+        "@actions/exec": "^3.0.0",
-        "@actions/http-client": "^2.0.1",
+        "@actions/http-client": "^4.0.0",
-        "@actions/io": "^1.1.1",
+        "@actions/io": "^3.0.0",
-        "semver": "^6.1.0",
+        "semver": "^7.7.3"
-        "uuid": "^3.3.2"
       }
     },
-    "node_modules/@actions/tool-cache/node_modules/uuid": {
+    "node_modules/@actions/tool-cache/node_modules/semver": {
-      "version": "3.4.0",
+      "version": "7.8.4",
-      "resolved": "https://registry.npmjs.org/uuid/-/uuid-3.4.0.tgz",
+      "resolved": "https://registry.npmjs.org/semver/-/semver-7.8.4.tgz",
-      "integrity": "sha512-HjSDRw6gZE5JMggctHBcjVak08+KEVhSIiDzFnT9S9aegmp85S/bReBVTb4QTFaRNptJ9kuYaNhnbNEOkbKb/A==",
+      "integrity": "sha512-rUCObTnP32Q08R2uuIrt7r9PlEonuTmtuXYcW6s5kjdlj3xbnwe+21yXptAUYcMAABLkYYTtnmzb3w3EDZfueA==",
-      "deprecated": "Please upgrade  to version 7 or higher.  Older versions may use Math.random() in certain circumstances, which is known to be problematic.  See https://v8.dev/blog/math-random for details.",
+      "license": "ISC",
       "bin": {
-        "uuid": "bin/uuid"
+        "semver": "bin/semver.js"
+      },
+      "engines": {
+        "node": ">=10"
       }
     },
     "node_modules/@ampproject/remapping": {
@@ -622,6 +636,30 @@
       "integrity": "sha512-0hYQ8SB4Db5zvZB4axdMHGwEaQjkZzFjQiN9LVYvIFB2nSUHW9tYpxWriPrWDASIxiaXax83REcLxuSdnGPZtw==",
       "dev": true
     },
+    "node_modules/@cspotcode/source-map-support": {
+      "version": "0.8.1",
+      "resolved": "https://registry.npmjs.org/@cspotcode/source-map-support/-/source-map-support-0.8.1.tgz",
+      "integrity": "sha512-IchNf6dN4tHoMFIn/7OE8LWZ19Y6q/67Bmf6vnGREv8RSbBVb9LPJxEcnwrcwX6ixSvaiGoomAUvu4YSxXrVgw==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@jridgewell/trace-mapping": "0.3.9"
+      },
+      "engines": {
+        "node": ">=12"
+      }
+    },
+    "node_modules/@cspotcode/source-map-support/node_modules/@jridgewell/trace-mapping": {
+      "version": "0.3.9",
+      "resolved": "https://registry.npmjs.org/@jridgewell/trace-mapping/-/trace-mapping-0.3.9.tgz",
+      "integrity": "sha512-3Belt6tdc8bPgAtbcmdtNJlirVoTmEb5e2gC94PnkwEW9jI6CAHUeoG85tjWP5WquqfavoMtMwiG4P926ZKKuQ==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@jridgewell/resolve-uri": "^3.0.3",
+        "@jridgewell/sourcemap-codec": "^1.4.10"
+      }
+    },
     "node_modules/@eslint-community/eslint-utils": {
       "version": "4.4.0",
       "resolved": "https://registry.npmjs.org/@eslint-community/eslint-utils/-/eslint-utils-4.4.0.tgz",
@@ -701,14 +739,6 @@
         "node": "^12.22.0 || ^14.17.0 || >=16.0.0"
       }
     },
-    "node_modules/@fastify/busboy": {
-      "version": "2.1.1",
-      "resolved": "https://registry.npmjs.org/@fastify/busboy/-/busboy-2.1.1.tgz",
-      "integrity": "sha512-vBZP4NlzfOlerQTnba4aqZoMhE/a9HY7HRqoOPaETQcSQuWEIyZMHGfVu6w9wGtGK5fED5qRs2DteVCjOH60sA==",
-      "engines": {
-        "node": ">=14"
-      }
-    },
     "node_modules/@github/browserslist-config": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/@github/browserslist-config/-/browserslist-config-1.0.0.tgz",
@@ -1241,151 +1271,131 @@
       }
     },
     "node_modules/@octokit/auth-token": {
-      "version": "4.0.0",
+      "version": "6.0.0",
-      "resolved": "https://registry.npmjs.org/@octokit/auth-token/-/auth-token-4.0.0.tgz",
+      "resolved": "https://registry.npmjs.org/@octokit/auth-token/-/auth-token-6.0.0.tgz",
-      "integrity": "sha512-tY/msAuJo6ARbK6SPIxZrPBms3xPbfwBrulZe0Wtr/DIY9lje2HeV1uoebShn6mx7SjCHif6EjMvoREj+gZ+SA==",
+      "integrity": "sha512-P4YJBPdPSpWTQ1NU4XYdvHvXJJDxM6YwpS0FZHRgP7YFkdVxsWcpWGy/NVqlAA7PcPCnMacXlRm1y2PFZRWL/w==",
+      "license": "MIT",
       "engines": {
-        "node": ">= 18"
+        "node": ">= 20"
       }
     },
     "node_modules/@octokit/core": {
-      "version": "5.2.0",
+      "version": "7.0.6",
-      "resolved": "https://registry.npmjs.org/@octokit/core/-/core-5.2.0.tgz",
+      "resolved": "https://registry.npmjs.org/@octokit/core/-/core-7.0.6.tgz",
-      "integrity": "sha512-1LFfa/qnMQvEOAdzlQymH0ulepxbxnCYAKJZfMci/5XJyIHWgEYnDmgnKakbTh7CH2tFQ5O60oYDvns4i9RAIg==",
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+      "license": "MIT",
       "dependencies": {
-        "@octokit/auth-token": "^4.0.0",
+        "@octokit/auth-token": "^6.0.0",
-        "@octokit/graphql": "^7.1.0",
+        "@octokit/graphql": "^9.0.3",
-        "@octokit/request": "^8.3.1",
+        "@octokit/request": "^10.0.6",
-        "@octokit/request-error": "^5.1.0",
+        "@octokit/request-error": "^7.0.2",
-        "@octokit/types": "^13.0.0",
+        "@octokit/types": "^16.0.0",
-        "before-after-hook": "^2.2.0",
+        "before-after-hook": "^4.0.0",
-        "universal-user-agent": "^6.0.0"
+        "universal-user-agent": "^7.0.0"
       },
       "engines": {
-        "node": ">= 18"
+        "node": ">= 20"
       }
     },
     "node_modules/@octokit/endpoint": {
-      "version": "9.0.6",
+      "version": "11.0.3",
-      "resolved": "https://registry.npmjs.org/@octokit/endpoint/-/endpoint-9.0.6.tgz",
+      "resolved": "https://registry.npmjs.org/@octokit/endpoint/-/endpoint-11.0.3.tgz",
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       "license": "MIT",
       "dependencies": {
-        "@octokit/types": "^13.1.0",
+        "@octokit/types": "^16.0.0",
-        "universal-user-agent": "^6.0.0"
+        "universal-user-agent": "^7.0.2"
       },
       "engines": {
-        "node": ">= 18"
+        "node": ">= 20"
       }
     },
     "node_modules/@octokit/graphql": {
-      "version": "7.1.0",
+      "version": "9.0.3",
-      "resolved": "https://registry.npmjs.org/@octokit/graphql/-/graphql-7.1.0.tgz",
+      "resolved": "https://registry.npmjs.org/@octokit/graphql/-/graphql-9.0.3.tgz",
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-        "node": ">= 18"
+        "node": ">= 20"
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-      "resolved": "https://registry.npmjs.org/@octokit/openapi-types/-/openapi-types-22.1.0.tgz",
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-        "node": ">= 18"
+        "node": ">= 20"
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-      }
-    },
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+      "resolved": "https://registry.npmjs.org/undici/-/undici-6.27.0.tgz",
-      "integrity": "sha512-raqeBD6NQK4SkWhQzeYKd1KmIG6dllBOTt55Rmkt4HtI9mwdWtJljnrXjAFUBLTSN67HWrOIZ3EPF4kjUw80Bg==",
+      "integrity": "sha512-YmfV3YnEDzXRC5lZ2jWtWWHKGUm1zIt8AhesR1tens+HTNv+YZlN/dp6G727LOvMJ8xjP9Be7Y2Sdr96LDm+pg==",
       "license": "MIT",
-      "dependencies": {
-        "@fastify/busboy": "^2.0.0"
-      },
       "engines": {
-        "node": ">=14.0"
+        "node": ">=18.17"
       }
     },
     "node_modules/undici-types": {
-      "version": "5.26.5",
+      "version": "7.8.0",
-      "resolved": "https://registry.npmjs.org/undici-types/-/undici-types-5.26.5.tgz",
+      "resolved": "https://registry.npmjs.org/undici-types/-/undici-types-7.8.0.tgz",
-      "integrity": "sha512-JlCMO+ehdEIKqlFxk6IfVoAUVmgz7cU7zD/h9XZ0qzeosSHmUJVOzSQvvYSYWXkFXC+IfLKSIffhv0sVZup6pA==",
+      "integrity": "sha512-9UJ2xGDvQ43tYyVMpuHlsgApydB8ZKfVYTsLDhXkFL/6gfkp+U8xTGdh8pMJv1SpZna0zxG1DwsKZsreLbXBxw==",
       "dev": true
     },
     "node_modules/universal-user-agent": {
-      "version": "6.0.1",
+      "version": "7.0.3",
-      "resolved": "https://registry.npmjs.org/universal-user-agent/-/universal-user-agent-6.0.1.tgz",
+      "resolved": "https://registry.npmjs.org/universal-user-agent/-/universal-user-agent-7.0.3.tgz",
-      "integrity": "sha512-yCzhz6FN2wU1NiiQRogkTQszlQSlpWaw8SvVegAc+bDxbzHgh1vX8uIe8OYyMH6DwH+sdTJsgMl36+mSMdRJIQ=="
+      "integrity": "sha512-TmnEAEAsBJVZM/AADELsK76llnwcf9vMKuPz8JflO1frO8Lchitr0fNaN9d+Ap0BjKtqWqd/J17qeDnXh8CL2A==",
+      "license": "ISC"
     },
     "node_modules/update-browserslist-db": {
       "version": "1.0.13",
@@ -6914,17 +7056,12 @@
         "punycode": "^2.1.0"
       }
     },
-    "node_modules/uuid": {
+    "node_modules/v8-compile-cache-lib": {
-      "version": "9.0.1",
+      "version": "3.0.1",
-      "resolved": "https://registry.npmjs.org/uuid/-/uuid-9.0.1.tgz",
+      "resolved": "https://registry.npmjs.org/v8-compile-cache-lib/-/v8-compile-cache-lib-3.0.1.tgz",
-      "integrity": "sha512-b+1eJOlsR9K8HJpow9Ok3fiWOWSIcIzXodvv0rQjVoOVNpWMpxf1wZNpt4y9h10odCNrqnYp1OBzRktckBe3sA==",
+      "integrity": "sha512-wa7YjyUGfNZngI/vtK0UHAN+lgDCxBPCylVXGp0zu59Fz5aiGtNXaq3DhIov063MorB+VfufLh3JlF2KdTK3xg==",
-      "funding": [
+      "dev": true,
-        "https://github.com/sponsors/broofa",
+      "license": "MIT"
-        "https://github.com/sponsors/ctavan"
-      ],
-      "bin": {
-        "uuid": "dist/bin/uuid"
-      }
     },
     "node_modules/v8-to-istanbul": {
       "version": "9.2.0",
@@ -7063,7 +7200,8 @@
     "node_modules/wrappy": {
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/wrappy/-/wrappy-1.0.2.tgz",
-      "integrity": "sha512-l4Sp/DRseor9wL6EvV2+TuQn63dMkPjZ/sp9XkghTEbV9KlPS1xUsZ3u7/IQO4wxtcFB4bgpQPRcR3QCvezPcQ=="
+      "integrity": "sha512-l4Sp/DRseor9wL6EvV2+TuQn63dMkPjZ/sp9XkghTEbV9KlPS1xUsZ3u7/IQO4wxtcFB4bgpQPRcR3QCvezPcQ==",
+      "dev": true
     },
     "node_modules/write-file-atomic": {
       "version": "4.0.2",
@@ -7120,6 +7258,16 @@
         "node": ">=12"
       }
     },
+    "node_modules/yn": {
+      "version": "3.1.1",
+      "resolved": "https://registry.npmjs.org/yn/-/yn-3.1.1.tgz",
+      "integrity": "sha512-Ux4ygGWsu2c7isFWe8Yu1YluJmqVhxqK2cLXNQA5AcC3QfbGNpM7fu0Y8b/z16pXLnFxZYvWhd3fhBY9DLmC6Q==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=6"
+      }
+    },
     "node_modules/yocto-queue": {
       "version": "0.1.0",
       "resolved": "https://registry.npmjs.org/yocto-queue/-/yocto-queue-0.1.0.tgz",

package.json

@@ -1,14 +1,15 @@
 {
   "name": "checkout",
-  "version": "4.3.0",
+  "version": "5.0.0",
   "description": "checkout action",
+  "type": "module",
   "main": "lib/main.js",
   "scripts": {
-    "build": "tsc && ncc build && node lib/misc/generate-docs.js",
+    "build": "tsc && ncc build src/main.ts -o dist && node lib/misc/generate-docs.js",
     "format": "prettier --write '**/*.ts'",
     "format-check": "prettier --check '**/*.ts'",
     "lint": "eslint src/**/*.ts",
-    "test": "jest",
+    "test": "node --experimental-vm-modules node_modules/jest/bin/jest.js",
     "licensed-check": "src/misc/licensed-check.sh",
     "licensed-generate": "src/misc/licensed-generate.sh"
   },
@@ -27,29 +28,30 @@
     "url": "https://github.com/actions/checkout/issues"
   },
   "homepage": "https://github.com/actions/checkout#readme",
+  "engines": {
+    "node": ">=24"
+  },
   "dependencies": {
-    "@actions/core": "^1.10.1",
+    "@actions/core": "^3.0.1",
-    "@actions/exec": "^1.1.1",
+    "@actions/exec": "^3.0.0",
-    "@actions/github": "^6.0.0",
+    "@actions/github": "^9.1.1",
-    "@actions/io": "^1.1.3",
+    "@actions/io": "^3.0.2",
-    "@actions/tool-cache": "^2.0.1",
+    "@actions/tool-cache": "^4.0.0"
-    "uuid": "^9.0.1"
   },
   "devDependencies": {
     "@types/jest": "^29.5.12",
-    "@types/node": "^20.12.12",
+    "@types/node": "^24.1.0",
-    "@types/uuid": "^9.0.8",
     "@typescript-eslint/eslint-plugin": "^7.9.0",
     "@typescript-eslint/parser": "^7.9.0",
-    "@vercel/ncc": "^0.38.1",
+    "@vercel/ncc": "^0.38.4",
     "eslint": "^8.57.0",
     "eslint-plugin-github": "^4.10.2",
     "eslint-plugin-jest": "^28.8.2",
     "jest": "^29.7.0",
-    "jest-circus": "^29.7.0",
+    "js-yaml": "^4.2.0",
-    "js-yaml": "^4.1.0",
     "prettier": "^3.3.3",
     "ts-jest": "^29.2.5",
+    "ts-node": "^10.9.2",
     "typescript": "^5.5.4"
   }
 }

src/git-auth-helper.ts

@@ -5,12 +5,12 @@ import * as fs from 'fs'
 import * as io from '@actions/io'
 import * as os from 'os'
 import * as path from 'path'
-import * as regexpHelper from './regexp-helper'
+import * as regexpHelper from './regexp-helper.js'
-import * as stateHelper from './state-helper'
+import * as stateHelper from './state-helper.js'
-import * as urlHelper from './url-helper'
+import * as urlHelper from './url-helper.js'
-import {v4 as uuid} from 'uuid'
+import {randomUUID} from 'crypto'
-import {IGitCommandManager} from './git-command-manager'
+import {IGitCommandManager} from './git-command-manager.js'
-import {IGitSourceSettings} from './git-source-settings'
+import {IGitSourceSettings} from './git-source-settings.js'
 
 const IS_WINDOWS = process.platform === 'win32'
 const SSH_COMMAND_KEY = 'core.sshCommand'
@@ -43,6 +43,7 @@ class GitAuthHelper {
   private sshKeyPath = ''
   private sshKnownHostsPath = ''
   private temporaryHomePath = ''
+  private credentialsConfigPath = '' // Path to separate credentials config file in RUNNER_TEMP
 
   constructor(
     gitCommandManager: IGitCommandManager,
@@ -89,7 +90,7 @@ class GitAuthHelper {
     // Create a temp home directory
     const runnerTemp = process.env['RUNNER_TEMP'] || ''
     assert.ok(runnerTemp, 'RUNNER_TEMP is not defined')
-    const uniqueId = uuid()
+    const uniqueId = randomUUID()
     this.temporaryHomePath = path.join(runnerTemp, uniqueId)
     await fs.promises.mkdir(this.temporaryHomePath, {recursive: true})
 
@@ -126,16 +127,21 @@ class GitAuthHelper {
 
   async configureGlobalAuth(): Promise<void> {
     // 'configureTempGlobalConfig' noops if already set, just returns the path
-    const newGitConfigPath = await this.configureTempGlobalConfig()
+    await this.configureTempGlobalConfig()
     try {
       // Configure the token
-      await this.configureToken(newGitConfigPath, true)
+      await this.configureToken(true)
 
       // Configure HTTPS instead of SSH
       await this.git.tryConfigUnset(this.insteadOfKey, true)
       if (!this.settings.sshKey) {
         for (const insteadOfValue of this.insteadOfValues) {
-          await this.git.config(this.insteadOfKey, insteadOfValue, true, true)
+          await this.git.config(
+            this.insteadOfKey,
+            insteadOfValue,
+            true, // globalConfig?
+            true // add?
+          )
         }
       }
     } catch (err) {
@@ -150,24 +156,60 @@ class GitAuthHelper {
 
   async configureSubmoduleAuth(): Promise<void> {
     // Remove possible previous HTTPS instead of SSH
-    await this.removeGitConfig(this.insteadOfKey, true)
+    await this.removeSubmoduleGitConfig(this.insteadOfKey)
 
     if (this.settings.persistCredentials) {
-      // Configure a placeholder value. This approach avoids the credential being captured
+      // Get the credentials config file path in RUNNER_TEMP
-      // by process creation audit events, which are commonly logged. For more information,
+      const credentialsConfigPath = this.getCredentialsConfigPath()
-      // refer to https://docs.microsoft.com/en-us/windows-server/identity/ad-ds/manage/component-updates/command-line-process-auditing
+
-      const output = await this.git.submoduleForeach(
+      // Container credentials config path
-        // wrap the pipeline in quotes to make sure it's handled properly by submoduleForeach, rather than just the first part of the pipeline
+      const containerCredentialsPath = path.posix.join(
-        `sh -c "git config --local '${this.tokenConfigKey}' '${this.tokenPlaceholderConfigValue}' && git config --local --show-origin --name-only --get-regexp remote.origin.url"`,
+        '/github/runner_temp',
+        path.basename(credentialsConfigPath)
+      )
+
+      // Get submodule config file paths.
+      const configPaths = await this.git.getSubmoduleConfigPaths(
         this.settings.nestedSubmodules
       )
 
-      // Replace the placeholder
+      // For each submodule, configure includeIf entries pointing to the shared credentials file.
-      const configPaths: string[] =
+      // Configure both host and container paths to support Docker container actions.
-        output.match(/(?<=(^|\n)file:)[^\t]+(?=\tremote\.origin\.url)/g) || []
       for (const configPath of configPaths) {
-        core.debug(`Replacing token placeholder in '${configPath}'`)
+        // Submodule Git directory
-        await this.replaceTokenPlaceholder(configPath)
+        let submoduleGitDir = path.dirname(configPath) // The config file is at .git/modules/submodule-name/config
+        submoduleGitDir = submoduleGitDir.replace(/\\/g, '/') // Use forward slashes, even on Windows
+
+        // Configure host includeIf
+        await this.git.config(
+          `includeIf.gitdir:${submoduleGitDir}.path`,
+          credentialsConfigPath,
+          false, // globalConfig?
+          false, // add?
+          configPath
+        )
+
+        // Container submodule git directory
+        const githubWorkspace = process.env['GITHUB_WORKSPACE']
+        assert.ok(githubWorkspace, 'GITHUB_WORKSPACE is not defined')
+        let relativeSubmoduleGitDir = path.relative(
+          githubWorkspace,
+          submoduleGitDir
+        )
+        relativeSubmoduleGitDir = relativeSubmoduleGitDir.replace(/\\/g, '/') // Use forward slashes, even on Windows
+        const containerSubmoduleGitDir = path.posix.join(
+          '/github/workspace',
+          relativeSubmoduleGitDir
+        )
+
+        // Configure container includeIf
+        await this.git.config(
+          `includeIf.gitdir:${containerSubmoduleGitDir}.path`,
+          containerCredentialsPath,
+          false, // globalConfig?
+          false, // add?
+          configPath
+        )
       }
 
       if (this.settings.sshKey) {
@@ -201,6 +243,10 @@ class GitAuthHelper {
     }
   }
 
+  /**
+   * Configures SSH authentication by writing the SSH key and known hosts,
+   * and setting up the GIT_SSH_COMMAND environment variable.
+   */
   private async configureSsh(): Promise<void> {
     if (!this.settings.sshKey) {
       return
@@ -209,7 +255,7 @@ class GitAuthHelper {
     // Write key
     const runnerTemp = process.env['RUNNER_TEMP'] || ''
     assert.ok(runnerTemp, 'RUNNER_TEMP is not defined')
-    const uniqueId = uuid()
+    const uniqueId = randomUUID()
     this.sshKeyPath = path.join(runnerTemp, uniqueId)
     stateHelper.setSshKeyPath(this.sshKeyPath)
     await fs.promises.mkdir(runnerTemp, {recursive: true})
@@ -272,57 +318,127 @@ class GitAuthHelper {
     }
   }
 
-  private async configureToken(
+  /**
-    configPath?: string,
+   * Configures token-based authentication by creating a credentials config file
-    globalConfig?: boolean
+   * and setting up includeIf entries to reference it.
-  ): Promise<void> {
+   * @param globalConfig Whether to configure global config instead of local
-    // Validate args
+   */
-    assert.ok(
+  private async configureToken(globalConfig?: boolean): Promise<void> {
-      (configPath && globalConfig) || (!configPath && !globalConfig),
+    // Get the credentials config file path in RUNNER_TEMP
-      'Unexpected configureToken parameter combinations'
+    const credentialsConfigPath = this.getCredentialsConfigPath()
-    )
 
-    // Default config path
+    // Write placeholder to the separate credentials config file using git config.
-    if (!configPath && !globalConfig) {
+    // This approach avoids the credential being captured by process creation audit events,
-      configPath = path.join(this.git.getWorkingDirectory(), '.git', 'config')
+    // which are commonly logged. For more information, refer to
-    }
+    // https://docs.microsoft.com/en-us/windows-server/identity/ad-ds/manage/component-updates/command-line-process-auditing
-
-    // Configure a placeholder value. This approach avoids the credential being captured
-    // by process creation audit events, which are commonly logged. For more information,
-    // refer to https://docs.microsoft.com/en-us/windows-server/identity/ad-ds/manage/component-updates/command-line-process-auditing
     await this.git.config(
       this.tokenConfigKey,
       this.tokenPlaceholderConfigValue,
-      globalConfig
+      false, // globalConfig?
+      false, // add?
+      credentialsConfigPath
     )
 
-    // Replace the placeholder
+    // Replace the placeholder in the credentials config file
-    await this.replaceTokenPlaceholder(configPath || '')
+    let content = (await fs.promises.readFile(credentialsConfigPath)).toString()
-  }
-
-  private async replaceTokenPlaceholder(configPath: string): Promise<void> {
-    assert.ok(configPath, 'configPath is not defined')
-    let content = (await fs.promises.readFile(configPath)).toString()
     const placeholderIndex = content.indexOf(this.tokenPlaceholderConfigValue)
     if (
       placeholderIndex < 0 ||
       placeholderIndex != content.lastIndexOf(this.tokenPlaceholderConfigValue)
     ) {
-      throw new Error(`Unable to replace auth placeholder in ${configPath}`)
+      throw new Error(
+        `Unable to replace auth placeholder in ${credentialsConfigPath}`
+      )
     }
     assert.ok(this.tokenConfigValue, 'tokenConfigValue is not defined')
     content = content.replace(
       this.tokenPlaceholderConfigValue,
       this.tokenConfigValue
     )
-    await fs.promises.writeFile(configPath, content)
+    await fs.promises.writeFile(credentialsConfigPath, content)
+
+    // Add include or includeIf to reference the credentials config
+    if (globalConfig) {
+      // Global config file is temporary
+      await this.git.config(
+        'include.path',
+        credentialsConfigPath,
+        true // globalConfig?
+      )
+    } else {
+      // Host git directory
+      let gitDir = path.join(this.git.getWorkingDirectory(), '.git')
+      gitDir = gitDir.replace(/\\/g, '/') // Use forward slashes, even on Windows
+
+      // Configure host includeIf
+      const hostIncludeKey = `includeIf.gitdir:${gitDir}.path`
+      await this.git.config(hostIncludeKey, credentialsConfigPath)
+
+      // Configure host includeIf for worktrees
+      const hostWorktreeIncludeKey = `includeIf.gitdir:${gitDir}/worktrees/*.path`
+      await this.git.config(hostWorktreeIncludeKey, credentialsConfigPath)
+
+      // Container git directory
+      const workingDirectory = this.git.getWorkingDirectory()
+      const githubWorkspace = process.env['GITHUB_WORKSPACE']
+      assert.ok(githubWorkspace, 'GITHUB_WORKSPACE is not defined')
+      let relativePath = path.relative(githubWorkspace, workingDirectory)
+      relativePath = relativePath.replace(/\\/g, '/') // Use forward slashes, even on Windows
+      const containerGitDir = path.posix.join(
+        '/github/workspace',
+        relativePath,
+        '.git'
+      )
+
+      // Container credentials config path
+      const containerCredentialsPath = path.posix.join(
+        '/github/runner_temp',
+        path.basename(credentialsConfigPath)
+      )
+
+      // Configure container includeIf
+      const containerIncludeKey = `includeIf.gitdir:${containerGitDir}.path`
+      await this.git.config(containerIncludeKey, containerCredentialsPath)
+
+      // Configure container includeIf for worktrees
+      const containerWorktreeIncludeKey = `includeIf.gitdir:${containerGitDir}/worktrees/*.path`
+      await this.git.config(
+        containerWorktreeIncludeKey,
+        containerCredentialsPath
+      )
+    }
   }
 
+  /**
+   * Gets or creates the path to the credentials config file in RUNNER_TEMP.
+   * @returns The absolute path to the credentials config file
+   */
+  private getCredentialsConfigPath(): string {
+    if (this.credentialsConfigPath) {
+      return this.credentialsConfigPath
+    }
+
+    const runnerTemp = process.env['RUNNER_TEMP'] || ''
+    assert.ok(runnerTemp, 'RUNNER_TEMP is not defined')
+
+    // Create a unique filename for this checkout instance
+    const configFileName = `git-credentials-${randomUUID()}.config`
+    this.credentialsConfigPath = path.join(runnerTemp, configFileName)
+
+    core.debug(`Credentials config path: ${this.credentialsConfigPath}`)
+    return this.credentialsConfigPath
+  }
+
+  /**
+   * Removes SSH authentication configuration by cleaning up SSH keys,
+   * known hosts files, and SSH command configurations.
+   */
   private async removeSsh(): Promise<void> {
     // SSH key
     const keyPath = this.sshKeyPath || stateHelper.SshKeyPath
     if (keyPath) {
       try {
+        core.info(`Removing SSH key '${keyPath}'`)
         await io.rmRF(keyPath)
       } catch (err) {
         core.debug(`${(err as any)?.message ?? err}`)
@@ -335,40 +451,149 @@ class GitAuthHelper {
       this.sshKnownHostsPath || stateHelper.SshKnownHostsPath
     if (knownHostsPath) {
       try {
+        core.info(`Removing SSH known hosts '${knownHostsPath}'`)
         await io.rmRF(knownHostsPath)
-      } catch {
+      } catch (err) {
-        // Intentionally empty
+        core.debug(`${(err as any)?.message ?? err}`)
+        core.warning(`Failed to remove SSH known hosts '${knownHostsPath}'`)
       }
     }
 
     // SSH command
+    core.info('Removing SSH command configuration')
     await this.removeGitConfig(SSH_COMMAND_KEY)
+    await this.removeSubmoduleGitConfig(SSH_COMMAND_KEY)
   }
 
+  /**
+   * Removes token-based authentication by cleaning up HTTP headers,
+   * includeIf entries, and credentials config files.
+   */
   private async removeToken(): Promise<void> {
-    // HTTP extra header
+    // Remove HTTP extra header
+    core.info('Removing HTTP extra header')
     await this.removeGitConfig(this.tokenConfigKey)
-  }
+    await this.removeSubmoduleGitConfig(this.tokenConfigKey)
 
-  private async removeGitConfig(
+    // Collect credentials config paths that need to be removed
-    configKey: string,
+    const credentialsPaths = new Set<string>()
-    submoduleOnly: boolean = false
+
-  ): Promise<void> {
+    // Remove includeIf entries that point to git-credentials-*.config files
-    if (!submoduleOnly) {
+    core.info('Removing includeIf entries pointing to credentials config files')
-      if (
+    const mainCredentialsPaths = await this.removeIncludeIfCredentials()
-        (await this.git.configExists(configKey)) &&
+    mainCredentialsPaths.forEach(path => credentialsPaths.add(path))
-        !(await this.git.tryConfigUnset(configKey))
+
-      ) {
+    // Remove submodule includeIf entries that point to git-credentials-*.config files
-        // Load the config contents
+    const submoduleConfigPaths = await this.git.getSubmoduleConfigPaths(true)
-        core.warning(`Failed to remove '${configKey}' from the git config`)
+    for (const configPath of submoduleConfigPaths) {
-      }
+      const submoduleCredentialsPaths =
+        await this.removeIncludeIfCredentials(configPath)
+      submoduleCredentialsPaths.forEach(path => credentialsPaths.add(path))
     }
 
+    // Remove credentials config files
+    for (const credentialsPath of credentialsPaths) {
+      // Only remove credentials config files if they are under RUNNER_TEMP
+      const runnerTemp = process.env['RUNNER_TEMP']
+      assert.ok(runnerTemp, 'RUNNER_TEMP is not defined')
+      if (credentialsPath.startsWith(runnerTemp)) {
+        try {
+          core.info(`Removing credentials config '${credentialsPath}'`)
+          await io.rmRF(credentialsPath)
+        } catch (err) {
+          core.debug(`${(err as any)?.message ?? err}`)
+          core.warning(
+            `Failed to remove credentials config '${credentialsPath}'`
+          )
+        }
+      } else {
+        core.debug(
+          `Skipping removal of credentials config '${credentialsPath}' - not under RUNNER_TEMP`
+        )
+      }
+    }
+  }
+
+  /**
+   * Removes a git config key from the local repository config.
+   * @param configKey The git config key to remove
+   */
+  private async removeGitConfig(configKey: string): Promise<void> {
+    if (
+      (await this.git.configExists(configKey)) &&
+      !(await this.git.tryConfigUnset(configKey))
+    ) {
+      // Load the config contents
+      core.warning(`Failed to remove '${configKey}' from the git config`)
+    }
+  }
+
+  /**
+   * Removes a git config key from all submodule configs.
+   * @param configKey The git config key to remove
+   */
+  private async removeSubmoduleGitConfig(configKey: string): Promise<void> {
     const pattern = regexpHelper.escape(configKey)
     await this.git.submoduleForeach(
-      // wrap the pipeline in quotes to make sure it's handled properly by submoduleForeach, rather than just the first part of the pipeline
+      // Wrap the pipeline in quotes to make sure it's handled properly by submoduleForeach, rather than just the first part of the pipeline.
       `sh -c "git config --local --name-only --get-regexp '${pattern}' && git config --local --unset-all '${configKey}' || :"`,
       true
     )
   }
+
+  /**
+   * Removes includeIf entries that point to git-credentials-*.config files.
+   * @param configPath Optional path to a specific git config file to operate on
+   * @returns Array of unique credentials config file paths that were found and removed
+   */
+  private async removeIncludeIfCredentials(
+    configPath?: string
+  ): Promise<string[]> {
+    const credentialsPaths = new Set<string>()
+
+    try {
+      // Get all includeIf.gitdir keys
+      const keys = await this.git.tryGetConfigKeys(
+        '^includeIf\\.gitdir:',
+        false, // globalConfig?
+        configPath
+      )
+
+      for (const key of keys) {
+        // Get all values for this key
+        const values = await this.git.tryGetConfigValues(
+          key,
+          false, // globalConfig?
+          configPath
+        )
+        if (values.length > 0) {
+          // Remove only values that match git-credentials-<uuid>.config pattern
+          for (const value of values) {
+            if (this.testCredentialsConfigPath(value)) {
+              credentialsPaths.add(value)
+              await this.git.tryConfigUnsetValue(key, value, false, configPath)
+            }
+          }
+        }
+      }
+    } catch (err) {
+      // Ignore errors - this is cleanup code
+      if (configPath) {
+        core.debug(`Error during includeIf cleanup for ${configPath}: ${err}`)
+      } else {
+        core.debug(`Error during includeIf cleanup: ${err}`)
+      }
+    }
+
+    return Array.from(credentialsPaths)
+  }
+
+  /**
+   * Tests if a path matches the git-credentials-*.config pattern.
+   * @param path The path to test
+   * @returns True if the path matches the credentials config pattern
+   */
+  private testCredentialsConfigPath(path: string): boolean {
+    return /git-credentials-[0-9a-f-]+\.config$/i.test(path)
+  }
 }

src/git-command-manager.ts

@@ -1,13 +1,13 @@
 import * as core from '@actions/core'
 import * as exec from '@actions/exec'
 import * as fs from 'fs'
-import * as fshelper from './fs-helper'
+import * as fshelper from './fs-helper.js'
 import * as io from '@actions/io'
 import * as path from 'path'
-import * as refHelper from './ref-helper'
+import * as refHelper from './ref-helper.js'
-import * as regexpHelper from './regexp-helper'
+import * as regexpHelper from './regexp-helper.js'
-import * as retryHelper from './retry-helper'
+import * as retryHelper from './retry-helper.js'
-import {GitVersion} from './git-version'
+import {GitVersion} from './git-version.js'
 
 // Auth header not supported before 2.9
 // Wire protocol v2 not supported before 2.18
@@ -28,7 +28,8 @@ export interface IGitCommandManager {
     configKey: string,
     configValue: string,
     globalConfig?: boolean,
-    add?: boolean
+    add?: boolean,
+    configFile?: string
   ): Promise<void>
   configExists(configKey: string, globalConfig?: boolean): Promise<boolean>
   fetch(
@@ -36,13 +37,13 @@ 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(): Promise<void>
+  init(objectFormat?: string): Promise<void>
   isDetached(): Promise<boolean>
   lfsFetch(ref: string): Promise<void>
   lfsInstall(): Promise<void>
@@ -59,8 +60,24 @@ export interface IGitCommandManager {
   tagExists(pattern: string): Promise<boolean>
   tryClean(): Promise<boolean>
   tryConfigUnset(configKey: string, globalConfig?: boolean): Promise<boolean>
+  tryConfigUnsetValue(
+    configKey: string,
+    configValue: string,
+    globalConfig?: boolean,
+    configFile?: string
+  ): Promise<boolean>
   tryDisableAutomaticGarbageCollection(): Promise<boolean>
   tryGetFetchUrl(): Promise<string>
+  tryGetConfigValues(
+    configKey: string,
+    globalConfig?: boolean,
+    configFile?: string
+  ): Promise<string[]>
+  tryGetConfigKeys(
+    pattern: string,
+    globalConfig?: boolean,
+    configFile?: string
+  ): Promise<string[]>
   tryReset(): Promise<boolean>
   version(): Promise<GitVersion>
 }
@@ -223,9 +240,15 @@ class GitCommandManager {
     configKey: string,
     configValue: string,
     globalConfig?: boolean,
-    add?: boolean
+    add?: boolean,
+    configFile?: string
   ): Promise<void> {
-    const args: string[] = ['config', globalConfig ? '--global' : '--local']
+    const args: string[] = ['config']
+    if (configFile) {
+      args.push('--file', configFile)
+    } else {
+      args.push(globalConfig ? '--global' : '--local')
+    }
     if (add) {
       args.push('--add')
     }
@@ -256,14 +279,13 @@ class GitCommandManager {
     options: {
       filter?: string
       fetchDepth?: number
-      fetchTags?: boolean
       showProgress?: boolean
     }
   ): Promise<void> {
     const args = ['-c', 'protocol.version=2', 'fetch']
-    if (!refSpec.some(x => x === refHelper.tagsRefSpec) && !options.fetchTags) {
+    // Always use --no-tags for explicit control over tag fetching
-      args.push('--no-tags')
+    // Tags are fetched explicitly via refspec when needed
-    }
+    args.push('--no-tags')
 
     args.push('--prune', '--no-recurse-submodules')
     if (options.showProgress) {
@@ -323,12 +345,33 @@ class GitCommandManager {
     throw new Error('Unexpected output when retrieving default branch')
   }
 
+  async getSubmoduleConfigPaths(recursive: boolean): Promise<string[]> {
+    // Get submodule config file paths.
+    // Use `--show-origin` to get the config file path for each submodule.
+    const output = await this.submoduleForeach(
+      `git config --local --show-origin --name-only --get-regexp remote.origin.url`,
+      recursive
+    )
+
+    // Extract config file paths from the output (lines starting with "file:").
+    const configPaths =
+      output.match(/(?<=(^|\n)file:)[^\t]+(?=\tremote\.origin\.url)/g) || []
+
+    return configPaths
+  }
+
   getWorkingDirectory(): string {
     return this.workingDirectory
   }
 
-  async init(): Promise<void> {
+  async init(objectFormat?: string): Promise<void> {
-    await this.execGit(['init', this.workingDirectory])
+    const args = ['init']
+    if (objectFormat === 'sha256') {
+      args.push('--object-format=sha256')
+    }
+    args.push(this.workingDirectory)
+
+    await this.execGit(args)
   }
 
   async isDetached(): Promise<boolean> {
@@ -455,6 +498,24 @@ class GitCommandManager {
     return output.exitCode === 0
   }
 
+  async tryConfigUnsetValue(
+    configKey: string,
+    configValue: string,
+    globalConfig?: boolean,
+    configFile?: string
+  ): Promise<boolean> {
+    const args = ['config']
+    if (configFile) {
+      args.push('--file', configFile)
+    } else {
+      args.push(globalConfig ? '--global' : '--local')
+    }
+    args.push('--unset', configKey, configValue)
+
+    const output = await this.execGit(args, true)
+    return output.exitCode === 0
+  }
+
   async tryDisableAutomaticGarbageCollection(): Promise<boolean> {
     const output = await this.execGit(
       ['config', '--local', 'gc.auto', '0'],
@@ -481,6 +542,56 @@ class GitCommandManager {
     return stdout
   }
 
+  async tryGetConfigValues(
+    configKey: string,
+    globalConfig?: boolean,
+    configFile?: string
+  ): Promise<string[]> {
+    const args = ['config']
+    if (configFile) {
+      args.push('--file', configFile)
+    } else {
+      args.push(globalConfig ? '--global' : '--local')
+    }
+    args.push('--get-all', configKey)
+
+    const output = await this.execGit(args, true)
+
+    if (output.exitCode !== 0) {
+      return []
+    }
+
+    return output.stdout
+      .trim()
+      .split('\n')
+      .filter(value => value.trim())
+  }
+
+  async tryGetConfigKeys(
+    pattern: string,
+    globalConfig?: boolean,
+    configFile?: string
+  ): Promise<string[]> {
+    const args = ['config']
+    if (configFile) {
+      args.push('--file', configFile)
+    } else {
+      args.push(globalConfig ? '--global' : '--local')
+    }
+    args.push('--name-only', '--get-regexp', pattern)
+
+    const output = await this.execGit(args, true)
+
+    if (output.exitCode !== 0) {
+      return []
+    }
+
+    return output.stdout
+      .trim()
+      .split('\n')
+      .filter(key => key.trim())
+  }
+
   async tryReset(): Promise<boolean> {
     const output = await this.execGit(['reset', '--hard', 'HEAD'], true)
     return output.exitCode === 0
@@ -623,7 +734,19 @@ class GitCommandManager {
       }
     }
     // Set the user agent
-    const gitHttpUserAgent = `git/${this.gitVersion} (github-actions-checkout)`
+    let gitHttpUserAgent = `git/${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}`
+      }
+    }
+
     core.debug(`Set git useragent to: ${gitHttpUserAgent}`)
     this.gitEnv['GIT_HTTP_USER_AGENT'] = gitHttpUserAgent
   }

src/git-directory-helper.ts

@@ -1,10 +1,10 @@
 import * as assert from 'assert'
 import * as core from '@actions/core'
 import * as fs from 'fs'
-import * as fsHelper from './fs-helper'
+import * as fsHelper from './fs-helper.js'
 import * as io from '@actions/io'
 import * as path from 'path'
-import {IGitCommandManager} from './git-command-manager'
+import {IGitCommandManager} from './git-command-manager.js'
 
 export async function prepareExistingDirectory(
   git: IGitCommandManager | undefined,

src/git-source-provider.ts

@@ -1,19 +1,19 @@
 import * as core from '@actions/core'
-import * as fsHelper from './fs-helper'
+import * as fsHelper from './fs-helper.js'
-import * as gitAuthHelper from './git-auth-helper'
+import * as gitAuthHelper from './git-auth-helper.js'
-import * as gitCommandManager from './git-command-manager'
+import * as gitCommandManager from './git-command-manager.js'
-import * as gitDirectoryHelper from './git-directory-helper'
+import * as gitDirectoryHelper from './git-directory-helper.js'
-import * as githubApiHelper from './github-api-helper'
+import * as githubApiHelper from './github-api-helper.js'
 import * as io from '@actions/io'
 import * as path from 'path'
-import * as refHelper from './ref-helper'
+import * as refHelper from './ref-helper.js'
-import * as stateHelper from './state-helper'
+import * as stateHelper from './state-helper.js'
-import * as urlHelper from './url-helper'
+import * as urlHelper from './url-helper.js'
 import {
   MinimumGitSparseCheckoutVersion,
   IGitCommandManager
-} from './git-command-manager'
+} from './git-command-manager.js'
-import {IGitSourceSettings} from './git-source-settings'
+import {IGitSourceSettings} from './git-source-settings.js'
 
 export async function getSource(settings: IGitSourceSettings): Promise<void> {
   // Repository URL
@@ -109,8 +109,25 @@ 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()
+      await git.init(objectFormat)
       await git.remoteAdd('origin', repositoryUrl)
       core.endGroup()
     }
@@ -159,7 +176,6 @@ export async function getSource(settings: IGitSourceSettings): Promise<void> {
     const fetchOptions: {
       filter?: string
       fetchDepth?: number
-      fetchTags?: boolean
       showProgress?: boolean
     } = {}
 
@@ -182,12 +198,35 @@ 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
-      fetchOptions.fetchTags = settings.fetchTags
+      const refSpec = refHelper.getRefSpec(
-      const refSpec = refHelper.getRefSpec(settings.ref, settings.commit)
+        settings.ref,
+        settings.commit,
+        settings.fetchTags
+      )
       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

@@ -118,4 +118,10 @@ 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

@@ -4,13 +4,18 @@ import * as fs from 'fs'
 import * as github from '@actions/github'
 import * as io from '@actions/io'
 import * as path from 'path'
-import * as retryHelper from './retry-helper'
+import * as retryHelper from './retry-helper.js'
 import * as toolCache from '@actions/tool-cache'
-import {v4 as uuid} from 'uuid'
+import {randomUUID} from 'crypto'
-import {getServerApiUrl} from './url-helper'
+import {getServerApiUrl} from './url-helper.js'
 
 const IS_WINDOWS = process.platform === 'win32'
 
+export interface RepositoryObjectFormatResult {
+  format: string
+  succeeded: boolean
+}
+
 export async function downloadRepository(
   authToken: string,
   owner: string,
@@ -34,7 +39,7 @@ export async function downloadRepository(
 
   // Write archive to disk
   core.info('Writing archive to disk')
-  const uniqueId = uuid()
+  const uniqueId = randomUUID()
   const archivePath = IS_WINDOWS
     ? path.join(repositoryPath, `${uniqueId}.zip`)
     : path.join(repositoryPath, `${uniqueId}.tar.gz`)
@@ -122,6 +127,53 @@ 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

@@ -1,9 +1,10 @@
 import * as core from '@actions/core'
-import * as fsHelper from './fs-helper'
+import * as fsHelper from './fs-helper.js'
 import * as github from '@actions/github'
 import * as path from 'path'
-import * as workflowContextHelper from './workflow-context-helper'
+import * as unsafePrCheckoutHelper from './unsafe-pr-checkout-helper.js'
-import {IGitSourceSettings} from './git-source-settings'
+import * as workflowContextHelper from './workflow-context-helper.js'
+import {IGitSourceSettings} from './git-source-settings.js'
 
 export async function getInputs(): Promise<IGitSourceSettings> {
   const result = {} as unknown as IGitSourceSettings
@@ -71,7 +72,7 @@ export async function getInputs(): Promise<IGitSourceSettings> {
     }
   }
   // SHA?
-  else if (result.ref.match(/^[0-9a-fA-F]{40}$/)) {
+  else if (result.ref.match(/^(?:[0-9a-fA-F]{40}|[0-9a-fA-F]{64})$/)) {
     result.commit = result.ref
     result.ref = ''
   }
@@ -161,5 +162,18 @@ 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/main.ts

@@ -1,9 +1,11 @@
 import * as core from '@actions/core'
-import * as coreCommand from '@actions/core/lib/command'
+import * as gitSourceProvider from './git-source-provider.js'
-import * as gitSourceProvider from './git-source-provider'
+import * as inputHelper from './input-helper.js'
-import * as inputHelper from './input-helper'
 import * as path from 'path'
-import * as stateHelper from './state-helper'
+import * as stateHelper from './state-helper.js'
+import {fileURLToPath} from 'url'
+
+const __dirname = path.dirname(fileURLToPath(import.meta.url))
 
 async function run(): Promise<void> {
   try {
@@ -11,10 +13,8 @@ async function run(): Promise<void> {
 
     try {
       // Register problem matcher
-      coreCommand.issueCommand(
+      core.info(
-        'add-matcher',
+        `::add-matcher::${path.join(__dirname, 'problem-matcher.json')}`
-        {},
-        path.join(__dirname, 'problem-matcher.json')
       )
 
       // Get sources
@@ -22,7 +22,7 @@ async function run(): Promise<void> {
       core.setOutput('ref', sourceSettings.ref)
     } finally {
       // Unregister problem matcher
-      coreCommand.issueCommand('remove-matcher', {owner: 'checkout-git'}, '')
+      core.info('::remove-matcher owner=checkout-git::')
     }
   } catch (error) {
     core.setFailed(`${(error as any)?.message ?? error}`)

src/misc/generate-docs.ts

@@ -2,6 +2,9 @@ import * as fs from 'fs'
 import * as os from 'os'
 import * as path from 'path'
 import * as yaml from 'js-yaml'
+import {fileURLToPath} from 'url'
+
+const __dirname = path.dirname(fileURLToPath(import.meta.url))
 
 //
 // SUMMARY
@@ -120,7 +123,7 @@ function updateUsage(
 }
 
 updateUsage(
-  'actions/checkout@v4',
+  'actions/checkout@v6',
   path.join(__dirname, '..', '..', 'action.yml'),
   path.join(__dirname, '..', '..', 'README.md')
 )

src/ref-helper.ts

@@ -1,7 +1,7 @@
-import {IGitCommandManager} from './git-command-manager'
+import {IGitCommandManager} from './git-command-manager.js'
 import * as core from '@actions/core'
 import * as github from '@actions/github'
-import {getServerApiUrl, isGhes} from './url-helper'
+import {getServerApiUrl, isGhes} from './url-helper.js'
 
 export const tagsRefSpec = '+refs/tags/*:refs/tags/*'
 
@@ -76,55 +76,75 @@ export function getRefSpecForAllHistory(ref: string, commit: string): string[] {
   return result
 }
 
-export function getRefSpec(ref: string, commit: string): string[] {
+export function getRefSpec(
+  ref: string,
+  commit: string,
+  fetchTags?: boolean
+): 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)
-      return [`+${commit}:refs/remotes/origin/${branch}`]
+      result.push(`+${commit}:refs/remotes/origin/${branch}`)
     }
     // refs/pull/
     else if (upperRef.startsWith('REFS/PULL/')) {
       const branch = ref.substring('refs/pull/'.length)
-      return [`+${commit}:refs/remotes/pull/${branch}`]
+      result.push(`+${commit}:refs/remotes/pull/${branch}`)
     }
     // refs/tags/
     else if (upperRef.startsWith('REFS/TAGS/')) {
-      return [`+${commit}:${ref}`]
+      if (!fetchTags) {
+        result.push(`+${ref}:${ref}`)
+      }
     }
     // Otherwise no destination ref
     else {
-      return [commit]
+      result.push(commit)
     }
   }
   // Unqualified ref, check for a matching branch or tag
   else if (!upperRef.startsWith('REFS/')) {
-    return [
+    result.push(`+refs/heads/${ref}*:refs/remotes/origin/${ref}*`)
-      `+refs/heads/${ref}*:refs/remotes/origin/${ref}*`,
+    if (!fetchTags) {
-      `+refs/tags/${ref}*:refs/tags/${ref}*`
+      result.push(`+refs/tags/${ref}*:refs/tags/${ref}*`)
-    ]
+    }
   }
   // refs/heads/
   else if (upperRef.startsWith('REFS/HEADS/')) {
     const branch = ref.substring('refs/heads/'.length)
-    return [`+${ref}:refs/remotes/origin/${branch}`]
+    result.push(`+${ref}:refs/remotes/origin/${branch}`)
   }
   // refs/pull/
   else if (upperRef.startsWith('REFS/PULL/')) {
     const branch = ref.substring('refs/pull/'.length)
-    return [`+${ref}:refs/remotes/pull/${branch}`]
+    result.push(`+${ref}:refs/remotes/pull/${branch}`)
   }
   // refs/tags/
-  else {
+  else if (upperRef.startsWith('REFS/TAGS/')) {
-    return [`+${ref}:${ref}`]
+    if (!fetchTags) {
+      result.push(`+${ref}:${ref}`)
+    }
   }
+  // Other refs
+  else {
+    result.push(`+${ref}:${ref}`)
+  }
+
+  return result
 }
 
 /**
@@ -170,8 +190,10 @@ 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))
+      (await git.tagExists(tagName)) &&
+      commit === (await git.revParse(`${ref}^{commit}`))
     )
   }
   // Unexpected
@@ -236,7 +258,9 @@ export async function checkCommitInfo(
     }
 
     // Extract details from message
-    const match = commitInfo.match(/Merge ([0-9a-f]{40}) into ([0-9a-f]{40})/)
+    const match = commitInfo.match(
+      /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
@@ -268,7 +292,7 @@ export async function checkCommitInfo(
   }
 }
 
-function fromPayload(path: string): any {
+export function fromPayload(path: string): any {
   return select(github.context.payload, path)
 }
 

src/unsafe-pr-checkout-helper.ts

@@ -0,0 +1,88 @@
+import * as github from '@actions/github'
+import {fromPayload} from './ref-helper.js'
+
+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 after reviewing ` +
+      `the risks at https://gh.io/securely-using-pull_request_target, 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())
+  }
+}

src/url-helper.ts

@@ -1,6 +1,6 @@
 import * as assert from 'assert'
 import {URL} from 'url'
-import {IGitSourceSettings} from './git-source-settings'
+import {IGitSourceSettings} from './git-source-settings.js'
 
 export function getFetchUrl(settings: IGitSourceSettings): string {
   assert.ok(

tsconfig.json

@@ -1,17 +1,13 @@
 {
   "compilerOptions": {
-    "target": "es6",
+    "target": "ES2022",
-    "module": "commonjs",
+    "module": "NodeNext",
-    "lib": [
+    "moduleResolution": "NodeNext",
-      "es6"
-    ],
     "outDir": "./lib",
     "rootDir": "./src",
-    "declaration": true,
     "strict": true,
     "noImplicitAny": false,
-    "esModuleInterop": true,
+    "esModuleInterop": true
-    "skipLibCheck": true
   },
-  "exclude": ["__test__", "lib", "node_modules"]
+  "exclude": ["__test__", "lib", "node_modules", "jest.config.ts"]
 }