.github/workflows/build.yaml

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# this work for additional information regarding copyright ownership.
# The ASF licenses this file to You under the Apache License, Version 2.0
# (the "License"); you may not use this file except in compliance with
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name: build

# This workflow builds the Docker image if it does not exists already.
# For non-PR runs, it also publishes the image to the registry, tagging it by the full SHA of the commit.

on:
  pull_request:
    types: [opened, ready_for_review, synchronize]
  workflow_call:
    outputs:
      image-id:
        description: "Docker image ID in repo/owner/name:tag format"
        value: ${{ jobs.build.outputs.image-id }}

concurrency:
  group: ${{ github.sha }}
  cancel-in-progress: false

permissions:
  contents: read
  packages: write

jobs:
  build:
    runs-on: ubuntu-latest
    outputs:
      image-id: ${{ steps.meta.outputs.tags }}
    steps:
      - name: Generate image ID
        id: meta
        uses: docker/metadata-action@8e5442c4ef9f78752691e2d8f8d19755c6f78e81
        with:
          images: |
            ghcr.io/${{ github.repository_owner }}/ozone-testkrb5
          tags: |
            # keep single item
            # any further tags should be added only in build-and-tag.yaml, not here
            type=sha,prefix=,format=long

      - name: Check if image exists
        id: pull
        run: |
          success=false
          if docker pull "$DOCKER_METADATA_OUTPUT_TAGS"; then
            success=true
          fi

          echo "success=$success" >> $GITHUB_OUTPUT

      - name: Set up QEMU
        if: ${{ steps.pull.outputs.success == 'false' }}
        uses: docker/setup-qemu-action@49b3bc8e6bdd4a60e6116a5414239cba5943d3cf

      - name: Set up Docker Buildx
        if: ${{ steps.pull.outputs.success == 'false' }}
        uses: docker/setup-buildx-action@c47758b77c9736f4b2ef4073d4d51994fabfe349

      - name: Login to GitHub Container Registry
        id: login
        if: ${{ github.event_name != 'pull_request' && steps.pull.outputs.success == 'false' }}
        uses: docker/login-action@9780b0c442fbb1117ed29e0efdff1e18412f7567
        with:
          registry: ghcr.io
          username: ${{ github.repository_owner }}
          password: ${{ secrets.GITHUB_TOKEN }}

      - name: Build and push image to GitHub Container Registry
        id: build
        if: ${{ steps.pull.outputs.success == 'false' }}
        uses: docker/build-push-action@4f58ea79222b3b9dc2c8bbdd6debcef730109a75
        with:
          platforms: linux/amd64,linux/arm64
          push: ${{ github.event_name != 'pull_request' }}
          tags: ${{ steps.meta.outputs.tags }}
          labels: ${{ steps.meta.outputs.labels }}