Add kselftest count from previous rebase

Author: bmastbergen

.github/workflows/clk-rebase.yml

@@ -34,7 +34,7 @@ jobs:
         run: |
           dnf install epel-release -y
           dnf groupinstall 'Development Tools' -y
-          dnf install --enablerepo=crb bc dwarves elfutils-libelf-devel grubby grub2-tools iproute kernel-devel openssl-devel qemu-kvm sudo virtme-ng -y
+          dnf install --enablerepo=crb bc dwarves elfutils-libelf-devel grubby grub2-tools iproute jq kernel-devel openssl-devel qemu-kvm sudo virtme-ng -y
 
           # so root can call sudo without complaint
           echo "root ALL=(ALL:ALL) NOPASSWD: ALL" >> /etc/sudoers
@@ -175,6 +175,39 @@ jobs:
           path: build.log
           if-no-files-found: warn
 
+      - name: Fetch previous PR kselftest results
+        if: success()
+        run: |
+          cd kernel-src-tree
+
+          # Extract the major.minor version for matching (e.g., "6.12" from "6.12.y")
+          CLK_VERSION=$(echo "$STABLE_BASE_VERSION" | grep -oP '^\d+\.\d+')
+          echo "Looking for previous [CIQ ${CLK_VERSION}] PR..."
+
+          # Find the most recent merged PR to the same base branch with matching CIQ version
+          PREVIOUS_PR=$(gh pr list \
+            --repo ${{ github.repository }} \
+            --base ${CLK_NEXT_BRANCH} \
+            --state merged \
+            --limit 10 \
+            --json number,title,body,mergedAt \
+            --jq "map(select(.title | contains(\"[CIQ ${CLK_VERSION}]\"))) | sort_by(.mergedAt) | reverse | .[0]")
+
+          if [ -n "$PREVIOUS_PR" ] && [ "$PREVIOUS_PR" != "null" ]; then
+            # Extract the test count from the previous PR body
+            PREVIOUS_PR_BODY=$(echo "$PREVIOUS_PR" | jq -r '.body')
+            PREVIOUS_OK_TESTS=$(echo "$PREVIOUS_PR_BODY" | grep -oP 'Selftests passed:\s+\*\*\K[0-9]+' || echo "unknown")
+            PREVIOUS_PR_NUMBER=$(echo "$PREVIOUS_PR" | jq -r '.number')
+
+            echo "Found previous PR #${PREVIOUS_PR_NUMBER} with ${PREVIOUS_OK_TESTS} passing tests"
+            echo "$PREVIOUS_OK_TESTS" > ../previous_ok_tests.txt
+            echo "$PREVIOUS_PR_NUMBER" > ../previous_pr_number.txt
+          else
+            echo "No previous [CIQ ${CLK_VERSION}] PR found"
+            echo "unknown" > ../previous_ok_tests.txt
+            echo "N/A" > ../previous_pr_number.txt
+          fi
+
       - name: Create Pull Request
         if: success()
         run: |
@@ -183,6 +216,8 @@ jobs:
           STABLE_VERSION=$(cat ../stable_version.txt)
           OK_TESTS=$(cat ../ok_tests.txt)
           CONFIG_CHANGES=$(cat ../config_changes.txt)
+          PREVIOUS_OK_TESTS=$(cat ../previous_ok_tests.txt)
+          PREVIOUS_PR_NUMBER=$(cat ../previous_pr_number.txt)
 
           # Extract abbreviated build log (first 20 and last 20 lines)
           #BUILD_LOG_SUMMARY=$(head -20 ../build.log && echo "" && echo "[snip]" && echo "" && tail -20 ../build.log)
@@ -194,6 +229,13 @@ jobs:
           SELFTEST_ARTIFACT_URL="https://github.com/${REPO}/actions/runs/${RUN_ID}"
           BUILD_LOG_ARTIFACT_URL="https://github.com/${REPO}/actions/runs/${RUN_ID}"
 
+          # Build previous test results line if available
+          if [ "$PREVIOUS_OK_TESTS" != "unknown" ] && [ "$PREVIOUS_PR_NUMBER" != "N/A" ]; then
+            PREVIOUS_TEST_LINE="Previous: ${PREVIOUS_OK_TESTS} tests ([PR #${PREVIOUS_PR_NUMBER}](https://github.com/${{ github.repository }}/pull/${PREVIOUS_PR_NUMBER}))"
+          else
+            PREVIOUS_TEST_LINE=""
+          fi
+
           # Create PR body
           cat > /tmp/pr_body.md <<EOF
           ## Automated Rebase to v${STABLE_VERSION}
@@ -210,6 +252,7 @@ jobs:
 
           ### Testing
           Selftests passed: **${OK_TESTS}** tests
+          ${PREVIOUS_TEST_LINE}
 
           ### Artifacts
           - [Build Log](${BUILD_LOG_ARTIFACT_URL})