workflows: only run the modified tests

Running all the tests on PR or push event of suricata-verify is
irrelevant as the tests are supposed to be exclusive of one another.
Make sure that unless there's a framework or workflows change, only the
tests that are modified or added are run. This saves CI resources that
would otherwise be unnecessarily spent.

This does not affect the testing and coverage of the Suricata codebase
as when there's an s-v PR, Suricata's workflow is to clone the entire
repo and run all the tests in there.

diff --git a/.github/workflows/builds.yml b/.github/workflows/builds.yml
index 9bbdf1b628f59ed96d4b48821c0e243b58c4db98..db666d0187a32f7425a515b4034d3401c826c86e 100644 (file)
--- a/.github/workflows/builds.yml
+++ b/.github/workflows/builds.yml
@@ -9,7 +9,7 @@ concurrency:
   cancel-in-progress: true
 
 jobs:
-  
+
   pcapng-check:
     name: PCAP Check
     runs-on: ubuntu-22.04
@@ -18,10 +18,51 @@ jobs:
       - run: ./pcapng-check.sh
       - run: ./pcap-check.sh
 
+  isolate-tests:
+    name: Isolate relevant tests
+    runs-on: ubuntu-22.04
+    outputs:
+      test_names: ${{ steps.fetch_changed_files.outputs.args }}
+    steps:
+      - uses: actions/checkout@v3
+        with:
+          fetch-depth: 0
+      - id: fetch_changed_files
+        name: Getting changed test names
+        run: |
+          case '${{ github.event_name }}' in
+          pull_request)
+            firstCommit=${{ github.event.pull_request.base.sha }}
+            lastCommit=${{ github.event.pull_request.head.sha }}
+            # Get names of all dirs changed in a PR
+            dirnames=$(git diff --name-only "${firstCommit}" "${lastCommit}" | xargs dirname | sort -u)
+            echo "Dirnames: $dirnames"
+
+            # check iff tests/ dir has changed
+            only_tests=1
+            for dir in $dirnames; do
+                if [[ $dir != tests/* ]]; then
+                    echo "$dir is not tests/"
+                    only_tests=0
+                    break
+                fi
+            done
+
+            if [ $only_tests == 1 ]; then
+                # Get the names of the innermost test dir
+                testnames=$(echo "$dirnames" | xargs -I {} basename "{}" | tr '\n' ' ')
+                echo "PR diff shows a change was done in test dirs. Running $testnames"
+                final_tests=$(echo "--exact $testnames")
+            fi
+            ;;
+          esac
+          echo "args=$final_tests" >> "$GITHUB_OUTPUT"
+
   ubuntu-22-04:
     name: Ubuntu 22.04
     runs-on: ubuntu-22.04
     container: ubuntu:22.04
+    needs: isolate-tests
     strategy:
       fail-fast: false
       matrix:
@@ -87,12 +128,13 @@ jobs:
           make -j2
       - name: Running suricata-verify
         working-directory: suricata
-        run: python3 ../run.py --quiet --outdir /tmp/sv-output
+        run: python3 ../run.py ${{ needs.isolate-tests.outputs.test_names }} --quiet --outdir /tmp/sv-output
 
   almalinux:
     name: AlmaLinux 8
     runs-on: ubuntu-latest
     container: almalinux:8
+    needs: isolate-tests
     strategy:
       fail-fast: false
       matrix:
@@ -155,11 +197,12 @@ jobs:
           make -j2
       - name: Running suricata-verify
         working-directory: suricata
-        run: python3 ../run.py --quiet
+        run: python3 ../run.py ${{ needs.isolate-tests.outputs.test_names }} --quiet
 
   macos:
     name: macOS
     runs-on: macos-latest
+    needs: isolate-tests
     strategy:
       fail-fast: false
       matrix:
@@ -209,11 +252,12 @@ jobs:
         working-directory: suricata
         run: |
           . ../testenv/bin/activate
-          python3 ../run.py --quiet
+          python3 ../run.py ${{ needs.isolate-tests.outputs.test_names }} --quiet
 
   windows:
     name: Windows
     runs-on: windows-latest
+    needs: isolate-tests
     strategy:
       fail-fast: false
       matrix:
@@ -261,4 +305,4 @@ jobs:
           make -j3
       - name: Running suricata-verify
         working-directory: suricata
-        run: python3 ../run.py --quiet
+        run: python3 ../run.py ${{ needs.isolate-tests.outputs.test_names }} --quiet