rules.yaml

name: Rules

on:
  pull_request:
    branches:
      - main
      - release/*
  push:
    branches:
      - main

jobs:
  # retrieves the changed rules files and the Falco versions to be used
  get-values:
    runs-on: ubuntu-latest
    outputs:
      changed-files: ${{ steps.set-changed-files.outputs.changed-files }}
      falco-versions: ${{ steps.set-falco-versions.outputs.versions }}
    steps:
      - name: Checkout rules
        uses: actions/checkout@v3

      - name: Get changed files
        id: changed-files
        if: github.event_name == 'pull_request'
        uses: Ana06/get-changed-files@v2.2.0
        with:
          format: space-delimited
          token: ${{ secrets.GITHUB_TOKEN }}

      - name: Find changed rules files
        id: set-changed-files
        run: |
          # if we skip changed-files because we're not in a pull-request,
          # then we consider all the rules contained in the repo
          all_files="${{ steps.changed-files.outputs.all }}"
          values=""
          if [ -z "$all_files" ]; then
            values=$(ls rules/*.yaml)
          else
            for changed_file in $all_files; do
              if [[ "${changed_file}" =~ ^rules/.* ]]; then
                values=${values}${changed_file}$'\n'
              fi
            done
          fi
          echo "changed-files=$(echo "${values}" | jq -R -s -c 'split("\n")' | jq -c 'map(select(length > 0))')" >> $GITHUB_OUTPUT

      - name: Read Falco versions
        id: set-falco-versions
        run: |
          values=""
          while read -r line
          do
            values="${values}${line}"$'\n'
          done < "./.github/FALCO_VERSIONS"
          echo "versions=$(echo "${values}" | jq -R -s -c 'split("\n")' | jq -c 'map(select(length > 0))')" >> $GITHUB_OUTPUT

  validate:
    if: needs.get-values.outputs.changed-files != '[]' && needs.get-values.outputs.changed-files != ''
    needs: get-values
    strategy:
      fail-fast: false
      matrix:
        rules-file: ${{ fromJson(needs.get-values.outputs.changed-files) }}
        falco-version: ${{ fromJson(needs.get-values.outputs.falco-versions) }}
    runs-on: ubuntu-latest
    steps:
      - name: Setup Golang
        uses: actions/setup-go@v3
        with:
          go-version: "1.19.0"

      - name: Checkout rules
        uses: actions/checkout@v3

      - name: Build checker tool
        working-directory: build/checker
        run: go build -o rules-check

      - name: Test checker tool
        working-directory: build/checker
        run: go test ./... -cover

      - name: Validate rules file
        run: |
          build/checker/rules-check \
              validate \
              --falco-image="falcosecurity/falco-no-driver:${{ matrix.falco-version }}" \
              -r ${{ matrix.rules-file }}

  check-version:
    if: github.event_name == 'pull_request' && needs.get-values.outputs.changed-files != '[]' && needs.get-values.outputs.changed-files != ''
    needs: get-values
    env:
      # note(jasondellaluce): using the most recent targeted Falco version
      FALCO_VERSION: ${{ fromJson(needs.get-values.outputs.falco-versions)[0] }}
    strategy:
      fail-fast: false
      matrix:
        rules-file: ${{ fromJson(needs.get-values.outputs.changed-files) }}
    runs-on: ubuntu-latest
    steps:
      - name: Setup Golang
        uses: actions/setup-go@v3
        with:
          go-version: "1.19.0"

      - name: Checkout rules
        uses: actions/checkout@v3

      - name: Get all git tags
        run: git fetch --tags origin

      - name: Get changed files
        uses: Ana06/get-changed-files@v2.2.0
        id: changed
        with:
          format: space-delimited
          token: ${{ secrets.GITHUB_TOKEN }}

      - name: Build checker tool
        working-directory: build/checker
        run: go build -o rules-check

      - name: Test checker tool
        working-directory: build/checker
        run: go test ./... -cover

      - name: Compare changed files with previous versions
        id: compare
        run: |
          ./.github/compare-rule-files.sh \
              "${{ matrix.rules-file }}" \
              result.txt \
              build/checker/rules-check \
              "falcosecurity/falco-no-driver:$FALCO_VERSION"
          if [ -s result.txt ]; then
            echo "comment_file=result.txt" >> $GITHUB_OUTPUT
          fi

      - name: Save PR info
        if: steps.compare.outputs.comment_file != ''
        run: |
          mkdir -p ./pr
          cp ${{ steps.compare.outputs.comment_file }} ./pr/COMMENT-${{ strategy.job-index }}

      - name: Upload PR info as artifact
        uses: actions/upload-artifact@v2
        if: steps.compare.outputs.comment_file != ''
        with:
          name: pr-${{ strategy.job-index }}
          path: pr/
          retention-days: 1

  upload-pr-info:
    needs: [get-values, check-version]
    if: ${{ !cancelled() && github.event_name == 'pull_request' && needs.get-values.outputs.changed-files != '[]' && needs.get-values.outputs.changed-files != '' }}
    runs-on: ubuntu-latest
    steps:
      - name: Download PR infos
        uses: actions/download-artifact@v3
        with:
          path: tmp-artifacts

      - name: Save PR info
        run: |
          if [ ! -d "./tmp-artifacts/" ]; then
            echo "No PR info found. Skipping."
            exit 0
          fi
          mkdir -p ./pr
          echo ${{ github.event.number }} > ./pr/NR
          touch ./pr/COMMENT
          echo "# Rules files suggestions" >> ./pr/COMMENT
          echo "" >> ./pr/COMMENT
          files=$(find ./tmp-artifacts/)
          for file in $files; do
            if [[ "$file" =~ "COMMENT" ]]; then
              cat "$file" >> ./pr/COMMENT
            fi
          done
          echo Uploading PR info...
          cat ./pr/COMMENT
          echo ""

      - name: Upload PR info as artifact
        uses: actions/upload-artifact@v2
        with:
          name: pr
          path: pr/
          retention-days: 1
          if-no-files-found: warn