Merge f787e7d544c130d1f240b14444b0ce9724a4f6db into 3b9b8c884f6b4bb4d5be2779c26374abadae0871

Add a scenario where it is necessary to push a commit to a pull request.

README.md

@@ -143,6 +143,7 @@ Please refer to the [release page](https://github.com/actions/checkout/releases/
 - [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)
 
 ## Fetch only the root files
 
@@ -288,6 +289,31 @@ jobs:
 ```
 *NOTE:* The user email is `{user.id}+{user.login}@users.noreply.github.com`. See users API: https://api.github.com/users/github-actions%5Bbot%5D
 
+## Push a commit to a PR using the built-in token
+
+In a pull request trigger, `ref` is required as GitHub Actions checks out in detached HEAD mode, meaning it doesn’t check out your branch by default.
+
+```yaml
+on: pull_request
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          ref: ${{ github.head_ref }}
+      - run: |
+          date > generated.txt
+          # Note: the following account information will not work on GHES
+          git config user.name "github-actions[bot]"
+          git config user.email "41898282+github-actions[bot]@users.noreply.github.com"
+          git add .
+          git commit -m "generated"
+          git push
+```
+*NOTE:* The user email is `{user.id}+{user.login}@users.noreply.github.com`. See users API: https://api.github.com/users/github-actions%5Bbot%5D
+
+
 # License
 
 The scripts and documentation in this project are released under the [MIT License](LICENSE)

src/git-source-provider.ts

@@ -1,4 +1,5 @@
 import * as core from '@actions/core'
+import * as github from '@actions/github'
 import * as fsHelper from './fs-helper'
 import * as gitAuthHelper from './git-auth-helper'
 import * as gitCommandManager from './git-command-manager'
@@ -274,6 +275,14 @@ export async function getSource(settings: IGitSourceSettings): Promise<void> {
       settings.commit,
       settings.githubServerUrl
     )
+
+    // Set default author
+    if (!await git.configExists('user.name', true)) {
+      await git.config('user.name', github.context.workflow, true)
+    }
+    if (!await git.configExists('user.email', true)) {
+      await git.config('user.email', 'github-actions@github.com', true)
+    }
   } finally {
     // Remove auth
     if (authHelper) {