gem5/.github/workflows/ci-tests.yaml

---
# This workflow runs after a pull-request has been approved by a reviewer.

name: CI Tests

on:
    pull_request:
        types: [opened, edited, synchronize, ready_for_review]

concurrency:
    group: ${{ github.workflow }}-${{ github.ref || github.run_id }}
    cancel-in-progress: true

jobs:
    pre-commit:
    # runs on github hosted runner
        runs-on: ubuntu-22.04
        if: github.event.pull_request.draft == false
        steps:
            - uses: actions/checkout@v4
            - uses: actions/setup-python@v3
            - uses: pre-commit/action@v3.0.0

  # ensures we have a change-id in every commit, needed for gerrit
    check-for-change-id:
        # runs on github hosted runner
        runs-on: ubuntu-22.04
        if: github.event.pull_request.draft == false
        steps:
            - uses: actions/checkout@v4
              with:
                  fetch-depth: 0
            - name: Check for Change-Id
              run: |
                  # loop through all the commits in the pull request
                  for commit in $(git rev-list ${{ github.event.pull_request.base.sha }}..${{ github.event.pull_request.head.sha }}); do
                      git checkout $commit
                      if (git log -1 --pretty=format:"%B" | grep -q "Change-Id: ")
                      then
                        # passes as long as at least one change-id exists in the pull request
                        exit 0
                      fi
                  done
                  # if we reach this part, none of the commits had a change-id
                  echo "None of the commits in this pull request contains a Change-ID, which we require for any changes made to gem5. "\
                    "To automatically insert one, run the following:\n f=`git rev-parse --git-dir`/hooks/commit-msg ; mkdir -p $(dirname $f) ; "\
                    "curl -Lo $f https://gerrit-review.googlesource.com/tools/hooks/commit-msg ; chmod +x $f\n Then amend the commit with git commit --amend --no-edit, and update your pull request."
                  exit 1

    unittests-all-opt:
        runs-on: [self-hosted, linux, x64]
        if: github.event.pull_request.draft == false
        container: ghcr.io/gem5/ubuntu-24.04_all-dependencies:latest
        needs: [pre-commit, check-for-change-id] # only runs if pre-commit and change-id passes
        timeout-minutes: 60
        steps:
            - uses: actions/checkout@v4
            - name: CI Unittests
              working-directory: ${{ github.workspace }}
              run: scons build/ALL/unittests.opt -j $(nproc)
            - run: echo "This job's status is ${{ job.status }}."

    testlib-quick-matrix:
        runs-on: [self-hosted, linux, x64]
        if: github.event.pull_request.draft == false
    # In order to make sure the environment is exactly the same, we run in
    # the same container we use to build gem5 and run the testlib tests. This
        container: ghcr.io/gem5/ubuntu-24.04_all-dependencies:latest
        needs: [pre-commit, check-for-change-id]
        steps:
            - uses: actions/checkout@v4

      # Unfortunately the 'ubunutu-latest' image doesn't have jq installed.
      # We therefore need to install it as a step here.
            - name: Install jq
              run: apt install -y jq

            - name: Get directories for testlib-quick
              working-directory: ${{ github.workspace }}/tests
              id: dir-matrix
              run: echo "test-dirs-matrix=$(find gem5/* -type d -maxdepth 0 | jq -ncR '[inputs]')" >>$GITHUB_OUTPUT

            - name: Get the build targets for testlib-quick-gem5-builds
              working-directory: ${{ github.workspace }}/tests
              id: build-matrix
              run: echo "build-matrix=$(./main.py list --build-targets -q | jq -ncR '[inputs]')" >>$GITHUB_OUTPUT

        outputs:
            build-matrix: ${{ steps.build-matrix.outputs.build-matrix }}
            test-dirs-matrix: ${{ steps.dir-matrix.outputs.test-dirs-matrix }}

    clang-fast-compilation:
        # gem5 binaries built in `quick-gem5-builds` always use GCC.
        # Clang is more strict than GCC. This job checks that gem5 compiles
        # with Clang. It compiles build/ALL/gem5.fast to maximize the change
        # for compilation error to be exposed.
        runs-on: [self-hosted, linux, x64]
        if: github.event.pull_request.draft == false
        container: ghcr.io/gem5/clang-version-16:latest
        needs: [pre-commit, check-for-change-id]
        timeout-minutes: 90
        steps:
            - uses: actions/checkout@v4
            - name: Clang Compilation
              working-directory: ${{ github.workspace }}
              run: scons build/ALL/gem5.fast -j $(nproc)

    testlib-quick-gem5-builds:
        runs-on: [self-hosted, linux, x64]
        if: github.event.pull_request.draft == false
        container: ghcr.io/gem5/ubuntu-24.04_all-dependencies:latest
        needs: [pre-commit, check-for-change-id, testlib-quick-matrix]
        strategy:
            matrix:
                build-target: ${{ fromJson(needs.testlib-quick-matrix.outputs.build-matrix) }}
        steps:
            - uses: actions/checkout@v4
            - name: Build gem5
              run: scons ${{ matrix.build-target }} -j $(nproc)

        # Upload the gem5 binary as an artifact.
        # Note: the "achor.txt" file is a hack to make sure the paths are
        # preserverd in the artifact. The upload-artifact action finds the
        # closest common directory and uploads everything relative to that.
        # E.g., if we upload "build/ARM/gem5.opt" and "build/RISCV/gem5.opt"
        # Then upload-artifact will upload "ARM/gem5.opt" and "RISCV/gem5.opt",
        # stripping the "build" directory. By adding the "anchor.txt" file, we
        # ensure the "build" directory is preserved.
            - run: echo "anchor" > anchor.txt
            - uses: actions/upload-artifact@v4
              with:
                  name: ci-tests-${{ github.run_number }}-testlib-quick-all-gem5-builds
                  path: |
                      build/*/gem5.*
                      anchor.txt
                  retention-days: 7

    testlib-quick-execution:
        runs-on: [self-hosted, linux, x64]
        if: github.event.pull_request.draft == false
        container: ghcr.io/gem5/ubuntu-24.04_all-dependencies:latest
        needs: [pre-commit, check-for-change-id, testlib-quick-matrix, testlib-quick-gem5-builds]
        timeout-minutes: 360 # 6 hours
        strategy:
            fail-fast: false
            matrix:
                test-dir: ${{ fromJson(needs.testlib-quick-matrix.outputs.test-dirs-matrix) }}
        steps:
            - name: Clean runner
              run: rm -rf ./* || true rm -rf ./.??* || true rm -rf ~/.cache || true

        # Checkout the repository then download the gem5.opt artifact.
            - uses: actions/checkout@v4
            - uses: actions/download-artifact@v4
              with:
                  name: ci-tests-${{ github.run_number }}-testlib-quick-all-gem5-builds

        # Check that the gem5.opt artifact exists and is executable.
            - name: Chmod gem5.{opt,debug,fast} to be executable
              run: |
                  find . -name "gem5.opt" -exec chmod u+x {} \;
                  find . -name "gem5.debug" -exec chmod u+x {} \;
                  find . -name "gem5.fast" -exec chmod u+x {} \;

        # Run the testlib quick tests in the given directory.
            - name: Run "tests/${{ matrix.test-dir }}" TestLib quick tests
              id: run-tests
              working-directory: ${{ github.workspace }}/tests
              run: ./main.py run --skip-build -vv -j$(nproc) ${{ matrix.test-dir }}

        # Get the basename of the matrix.test-dir path (to name the artifact).
            - name: Sanatize test-dir for artifact name
              id: sanitize-test-dir
              if: success() || failure()
              run: echo "sanatized-test-dir=$(echo '${{ matrix.test-dir }}' | sed 's/\//-/g')" >> $GITHUB_OUTPUT

        # Upload the tests/testing-results directory as an artifact.
            - name: Upload test results
              if: success() || failure()
              uses: actions/upload-artifact@v4
              with:
                  name: ci-tests-run-${{ github.run_number }}-attempt-${{ github.run_attempt }}-testlib-quick-${{ steps.sanitize-test-dir.outputs.sanatized-test-dir
                      }}-status-${{ steps.run-tests.outcome }}-output
                  path: tests/testing-results
                  retention-days: 30

    testlib-quick:
    # It is 'testlib-quick' which needs to pass for the pull request to be
    # merged. The 'testlib-quick-execution' is a matrix job which runs all the
    # the testlib quick tests. This job is therefore a stub which will pass if
    # all the testlib-quick-execution jobs pass.
        runs-on: ubuntu-22.04
        needs: testlib-quick-execution
        steps:
            - run: echo "This job's status is ${{ job.status }}."