prevent-deletion.yaml

name: Prevent Deletion

on:
  pull_request_target:
    types: [opened, reopened, synchronize]

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

jobs:
  check:
    permissions:
      checks: write
    runs-on: ubuntu-latest
    steps:
      - name: Checkout base
        uses: actions/checkout@v3
      - name: Fetch head
        run: |
          git remote add head ${{ github.event.pull_request.head.repo.clone_url }}
          git fetch --depth=1 head ${{ github.event.pull_request.head.ref }}
      - name: Find changes
        run: |
          git rev-parse '${{ github.event.pull_request.head.sha }}'
          if git diff --merge-base --name-only --diff-filter 'D' HEAD '${{ github.event.pull_request.head.sha }}' | grep -E '^media/.*\.(jpg|png|jpeg|gif)$' >/tmp/changed_files; then
            cat /tmp/changed_files
            echo '{"name":"Image Deletion Check","head_sha":"${{ github.event.pull_request.head.sha }}","status":"completed","conclusion":"failure"}' > /tmp/body.json
            jq \
              --arg count "$(wc -l /tmp/changed_files | awk '{print $1}')" \
              --arg summary "$(cat /tmp/changed_files | sed 's/^/- /')" \
              '.output.title = "Found " + $count + " deleted images" | .output.summary = $summary' \
            /tmp/body.json > /tmp/body2.json
          else
            echo '{"name":"Image Deletion Check","head_sha":"${{ github.event.pull_request.head.sha }}","status":"completed","conclusion":"success","output":{"title":"OK","summary":"No deleted images"}}' > /tmp/body2.json
          fi
      - name: Publish result
        run: |
          cat /tmp/body2.json
          curl \
            -sSL \
            -X POST \
            -H "Accept: application/vnd.github+json" \
            -H "Authorization: token ${{ github.token }}" \
            -T '/tmp/body2.json' \
          'https://api.github.com/repos/${{ github.repository }}/check-runs'