From 8d978a5823af849f40e17f998986dc49b96d9c74 Mon Sep 17 00:00:00 2001
From: Duncan Horn <dunhor@microsoft.com>
Date: Wed, 14 Jan 2026 09:25:08 -0800
Subject: [PATCH 1/2] Allow PR input for CI pipeline

---
 .github/workflows/ci.yml | 26 ++++++++++++++++++++++++--
 1 file changed, 24 insertions(+), 2 deletions(-)

diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 83435ee12..1fe596bed 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -6,6 +6,11 @@ permissions:
 on:
   pull_request:
   workflow_dispatch:
+    inputs:
+      pr_number:
+        description: 'PR number to test (leave empty to use current branch)'
+        required: false
+        type: number
   push:
     branches:
       - master
@@ -15,7 +20,16 @@ jobs:
     name: Format Check
     runs-on: windows-latest
     steps:
-      - uses: actions/checkout@v4
+      - name: Checkout input branch
+        if: github.event.inputs.pr_number
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+          ref: refs/pull/${{ github.event.inputs.pr_number }}/merge
+
+      - name: Checkout trigger branch
+        if: ${{ !github.event.inputs.pr_number }}
+        uses: actions/checkout@v4
         with:
           fetch-depth: 0
 
@@ -66,7 +80,15 @@ jobs:
 
     runs-on: ${{matrix.host}}
     steps:
-      - uses: actions/checkout@v4
+      - name: Checkout input branch
+        if: github.event.inputs.pr_number
+        uses: actions/checkout@v4
+        with:
+          ref: refs/pull/${{ github.event.inputs.pr_number }}/merge
+
+      - name: Checkout trigger branch
+        if: ${{ !github.event.inputs.pr_number }}
+        uses: actions/checkout@v4
 
       - name: Install/Update Clang
         if: matrix.compiler == 'clang'

From 10e0eafe2ac57e59995b4327bc58ce9889eb321d Mon Sep 17 00:00:00 2001
From: Duncan Horn <dunhor@microsoft.com>
Date: Thu, 15 Jan 2026 13:42:16 -0800
Subject: [PATCH 2/2] Checkout/push to the right branches and update format
 workflow to trigger CI

---
 .github/workflows/ci.yml     |  4 ++--
 .github/workflows/format.yml | 33 +++++++++++++++++++++++++--------
 2 files changed, 27 insertions(+), 10 deletions(-)

diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 1fe596bed..75ef75dc7 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -5,10 +5,10 @@ permissions:
 
 on:
   pull_request:
-  workflow_dispatch:
+  workflow_call:
     inputs:
       pr_number:
-        description: 'PR number to test (leave empty to use current branch)'
+        description: 'PR number to test'
         required: false
         type: number
   push:
diff --git a/.github/workflows/format.yml b/.github/workflows/format.yml
index b4d14e94c..2cd9351c4 100644
--- a/.github/workflows/format.yml
+++ b/.github/workflows/format.yml
@@ -26,6 +26,7 @@ jobs:
     outputs:
       pr-ref: ${{ steps.pr.outputs.ref }}
       pr-sha: ${{ steps.pr.outputs.sha }}
+      pr-repo: ${{ steps.pr.outputs.repo }}
       has-changes: ${{ steps.format.outputs.has-changes }}
 
     steps:
@@ -41,6 +42,7 @@ jobs:
             });
             core.setOutput('ref', pr.data.head.ref);
             core.setOutput('sha', pr.data.head.sha);
+            core.setOutput('repo', pr.data.head.repo.full_name);
             return pr.data.head.ref;
 
       - name: Checkout base repository
@@ -51,8 +53,8 @@ jobs:
       - name: Fetch PR branch
         shell: cmd
         run: |
-          git fetch origin ${{ steps.pr.outputs.ref }}
-          git checkout ${{ steps.pr.outputs.ref }}
+          git fetch origin pull/${{ github.event.issue.number }}/head:pr-head
+          git checkout pr-head
 
       - name: Run clang-format
         id: format
@@ -98,10 +100,12 @@ jobs:
           token: ${{ secrets.GITHUB_TOKEN }}
 
       - name: Fetch PR branch
+        env:
+          PR_NUMBER: ${{ github.event.issue.number }}
         shell: cmd
         run: |
-          git fetch origin ${{ needs.format-code.outputs.pr-ref }}
-          git checkout ${{ needs.format-code.outputs.pr-ref }}
+          git fetch origin pull/%PR_NUMBER%/head:pr-head
+          git checkout pr-head
 
       - name: Download patch
         uses: actions/download-artifact@v4
@@ -115,15 +119,28 @@ jobs:
           del format-changes.patch
 
       - name: Commit and push changes
-        shell: cmd
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          PR_REPO: ${{ needs.format-code.outputs.pr-repo }}
+          PR_REF: ${{ needs.format-code.outputs.pr-ref }}
+        shell: pwsh
         run: |
           git config user.name "github-actions[bot]"
           git config user.email "41898282+github-actions[bot]@users.noreply.github.com"
           git add -A
           git commit -m "Run clang-format on PR changes"
-          git push origin HEAD:${{ needs.format-code.outputs.pr-ref }}
-
-  # Job 3: Comment on PR with results
+          
+          # Try to push to fork repo (works if maintainer edits allowed)
+          git push https://x-access-token:$env:GITHUB_TOKEN@github.com/$env:PR_REPO HEAD:$env:PR_REF
+
+  # Job 3: Run CI workflow
+  run-ci:
+    needs: apply-changes
+    uses: ./.github/workflows/ci.yml
+    with:
+      pr_number: ${{ github.event.issue.number }}
+
+  # Job 4: Comment on PR with results
   comment-result:
     needs: [format-code, apply-changes]
     if: always() && needs.format-code.result != 'cancelled'