action.yml

name: AxoSyslog CFG diff (PR)
description: Calculates the config differences that a PR introduces and prepares a comment about it, to be picked up by a workflow_run workflow.

runs:
  using: composite
  steps:
    - name: Checkout axosyslog-cfg-helper source
      uses: actions/checkout@v4
      with:
        repository: alltilla/axosyslog-cfg-helper
        path: axosyslog-cfg-helper

    - name: Setup axosyslog-cfg-helper
      shell: bash
      working-directory: axosyslog-cfg-helper
      run: |
        curl -sSL https://install.python-poetry.org | python3 -
        make venv
        make bison BISON_INSTALL_PATH=${GITHUB_WORKSPACE}/bin
        echo "${GITHUB_WORKSPACE}/bin" >> $GITHUB_PATH

    - name: Checkout AxoSyslog
      uses: actions/checkout@v4
      with:
        repository: ${{ github.repository }}
        path: axosyslog

    - name: Query PR info and add PR head remote
      shell: bash
      working-directory: axosyslog
      run: |
        git fetch origin

        PR_INFO=$(gh -R ${{ github.repository }} pr view ${{ github.event.number }} --json "baseRefName,headRefName,headRepository,headRepositoryOwner")
        HEAD_REPOSITORY_OWNER=$(echo $PR_INFO | jq -r .headRepositoryOwner.login)
        HEAD_REPOSITORY=$(echo $PR_INFO | jq -r .headRepository.name)
        HEAD_REF_NAME=$(echo $PR_INFO | jq -r .headRefName)
        BASE_REF_NAME=$(echo $PR_INFO | jq -r .baseRefName)

        git remote add ${HEAD_REPOSITORY_OWNER} https://github.com/${HEAD_REPOSITORY_OWNER}/${HEAD_REPOSITORY}.git
        git fetch ${HEAD_REPOSITORY_OWNER}

        COMMON_ANCESTOR_REF=$(git merge-base origin/${BASE_REF_NAME} ${HEAD_REPOSITORY_OWNER}/${HEAD_REF_NAME})

        echo "HEAD_REPOSITORY_OWNER=${HEAD_REPOSITORY_OWNER}" >> ${GITHUB_ENV}
        echo "HEAD_REPOSITORY=${HEAD_REPOSITORY}" >> ${GITHUB_ENV}
        echo "HEAD_REF_NAME=${HEAD_REF_NAME}" >> ${GITHUB_ENV}
        echo "BASE_REF_NAME=${BASE_REF_NAME}" >> ${GITHUB_ENV}
        echo "COMMON_ANCESTOR_REF=${COMMON_ANCESTOR_REF}" >> ${GITHUB_ENV}

    - name: Checkout PR base branch
      shell: bash
      working-directory: axosyslog
      run: |
        git checkout ${COMMON_ANCESTOR_REF}

    - name: Generate base CFG database
      shell: bash
      working-directory: axosyslog-cfg-helper
      run: |
        make clean
        make db AXOSYSLOG_SOURCE_DIR=${GITHUB_WORKSPACE}/axosyslog DATABASE_FILE=${GITHUB_WORKSPACE}/base.db

    - name: Checkout PR head branch
      shell: bash
      working-directory: axosyslog
      run: |
        git checkout ${HEAD_REPOSITORY_OWNER}/${HEAD_REF_NAME}

    - name: Generate head CFG database
      shell: bash
      working-directory: axosyslog-cfg-helper
      run: |
        make clean
        make db AXOSYSLOG_SOURCE_DIR=${GITHUB_WORKSPACE}/axosyslog DATABASE_FILE=${GITHUB_WORKSPACE}/head.db

    - name: Generate CFG diff
      shell: bash
      working-directory: axosyslog-cfg-helper
      run: |
        poetry run python ./axosyslog_cfg_helper/generate_diff.py -o ${GITHUB_WORKSPACE}/base.db -n ${GITHUB_WORKSPACE}/head.db > ${GITHUB_WORKSPACE}/diff

    - name: Generate comment of CFG differences
      shell: bash
      working-directory: axosyslog
      run: |
        if [[ $(wc -l ${GITHUB_WORKSPACE}/diff | cut -d " " -f1) -gt 1 ]]; then
          awk '{printf "%s\\n", $0}' ${GITHUB_WORKSPACE}/diff > ${GITHUB_WORKSPACE}/diff_escaped

          COMMENT="#### This Pull Request introduces config grammar changes\r\n"
          COMMENT="${COMMENT}[${{ github.repository_owner }}/${COMMON_ANCESTOR_REF}](https://github.com/${{ github.repository }}/tree/${COMMON_ANCESTOR_REF}) -> [${HEAD_REPOSITORY_OWNER}/${HEAD_REF_NAME}](https://github.com/${HEAD_REPOSITORY_OWNER}/${HEAD_REPOSITORY}/tree/${HEAD_REF_NAME})\r\n"
          COMMENT="${COMMENT}<details>\r\n\r\n"
          COMMENT="${COMMENT}\`\`\`diff\r\n"
          COMMENT="${COMMENT}$(cat ${GITHUB_WORKSPACE}/diff_escaped)\n"
          COMMENT="${COMMENT}\`\`\`\r\n"
          COMMENT="${COMMENT}</details>"

          jq -n --arg body "$(echo -e "${COMMENT}")" '{body:$body}' > ${GITHUB_WORKSPACE}/comment
        else
          touch ${GITHUB_WORKSPACE}/comment
        fi

    - name: Upload comment as artifact
      uses: actions/upload-artifact@v3
      with:
        name: comment
        path: comment