From 7b876773e91c2b04889e2dcf399f09e67982b0a2 Mon Sep 17 00:00:00 2001
From: Ihor Solodrai <ihor.solodrai@linux.dev>
Date: Wed, 3 Dec 2025 12:21:09 -0800
Subject: [PATCH] ai-code-review.yml: provide series context to the AI

Change how the Linux source is checked out: replace actions/checkout
with libbpf/ci-get-linux-source action call which can use local git
mirror if it's available.

Change the job runner from github-hosted to self-hosted, because our
custom runners have a local Linux mirror.

When setting up the env for AI, fetch pull request head and then
switch to the target commit. Then in the trigger prompt provide the
commit range identifying the entire series. This way AI agent is able
to inspect changes in neighbouring commits.

Signed-off-by: Ihor Solodrai <ihor.solodrai@linux.dev>
---
 .github/workflows/ai-code-review.yml | 51 +++++++++++++++++++++-------
 1 file changed, 39 insertions(+), 12 deletions(-)

diff --git a/.github/workflows/ai-code-review.yml b/.github/workflows/ai-code-review.yml
index 1e06d2d4..4d5ab54f 100644
--- a/.github/workflows/ai-code-review.yml
+++ b/.github/workflows/ai-code-review.yml
@@ -14,30 +14,36 @@ jobs:
   get-commits:
     # This codition is an indicator that we are running in a context of PR owned by kernel-patches org
     if: ${{ github.repository == 'kernel-patches/bpf' && vars.AWS_REGION }}
-    runs-on: 'ubuntu-latest'
+    runs-on: [self-hosted, x86_64]
     continue-on-error: true
     outputs:
       commits: ${{ steps.get-commits.outputs.commits }}
     steps:
-      - name: Checkout Linux source tree
-        uses: actions/checkout@v5
+
+      - name: Download Linux source tree
+        uses: libbpf/ci/get-linux-source@v3
         with:
-          fetch-depth: 32
+          repo: ${{ github.event.pull_request.head.repo.clone_url }}
+          rev: ${{ github.event.pull_request.head.sha }}
+          dest: .kernel
+        env:
+          REFERENCE_REPO_PATH: /libbpfci/mirrors/linux
+          FETCH_DEPTH: 100
 
       # Get the list of commits and trigger a review job for each separate commit
       # As a safeguard, check no more than the first 50 commits
       - name: Get PR commits
         id: get-commits
         run: |
+          cd .kernel
           tmp=$(mktemp)
           git rev-list ${{ github.event.pull_request.base.sha }}..${{ github.event.pull_request.head.sha }} | head -n 50 > pr_commits.txt
           cat pr_commits.txt | jq -R -s -c 'split("\n")[:-1]' > $tmp
           echo "commits=$(cat $tmp)" >> $GITHUB_OUTPUT
 
-
   ai-review:
     needs: get-commits
-    runs-on: 'ubuntu-latest'
+    runs-on: [self-hosted, x86_64]
     strategy:
       matrix:
         commit: ${{ fromJson(needs.get-commits.outputs.commits) }}
@@ -71,11 +77,32 @@ jobs:
           mkdir -p ~/.claude
           cp ci/claude/settings.json ~/.claude/settings.json
 
-      - name: Checkout Linux source tree
-        uses: actions/checkout@v5
+      - name: Download Linux source tree
+        uses: libbpf/ci/get-linux-source@v3
         with:
-          fetch-depth: 32
-          ref: ${{ matrix.commit }}
+          repo: ${{ github.event.pull_request.head.repo.clone_url }}
+          rev: ${{ github.event.pull_request.head.sha }}
+          dest: .kernel
+        env:
+          REFERENCE_REPO_PATH: /libbpfci/mirrors/linux
+          FETCH_DEPTH: 100
+
+      # This manipulation is necessary to make sure that
+      # ${{ github.workspace }} is the root of the Linux git repo
+      - name: Move linux source in place
+        shell: bash
+        run: |
+          rm -rf .git .github ci
+          cd .kernel
+          mv -t .. $(ls -A)
+          cd ..
+          rmdir .kernel
+
+      - name: Checkout target commit
+        shell: bash
+        run: |
+          git checkout -b patch-series.local
+          git checkout ${{ matrix.commit }}
 
       - name: Get patch subject
         id: get-patch-subject
@@ -98,7 +125,8 @@ jobs:
           prompt: |
             Current directory is the root of a Linux Kernel git repository.
             Using the prompt `review/review-core.md` and the prompt directory `review`
-            do a code review of the top commit in the Linux repository.
+            do a code review of the top commit in the Linux repository. The commit is a part
+            of a patch series within the git range ${{ github.event.pull_request.base.sha }}..${{ github.event.pull_request.head.sha }}
 
       # If Claude produced review-inline.txt then it found something
       # Post a comment on PR and fail the job
@@ -129,4 +157,3 @@ jobs:
         run: |
           echo "Review file found - failing the CI job"
           exit 42
-