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name: Docker

on:
  push:
    branches-ignore:
      - 'dependabot/**'
  pull_request:
    branches:
      - 'main'

concurrency:
  group: ${{ github.workflow }}-${{ github.event.pull_request.number || (github.repository == 'openthread/openthread' && github.run_id) || github.ref }}
  cancel-in-progress: true

permissions:  # added using https://github.com/step-security/secure-workflows
  contents: read

env:
  DOCKERHUB_REPO: openthread/environment

jobs:
  build:
    strategy:
      fail-fast: false
      matrix:
        include:
          - platform: linux/amd64
            runner: ubuntu-24.04
          - platform: linux/arm64
            runner: ubuntu-24.04-arm

    runs-on: ${{ matrix.runner }}

    steps:
      - name: Harden Runner
        uses: step-security/harden-runner@bf7454d06d71f1098171f2acdf0cd4708d7b5920 # v2.20.0
        with:
          egress-policy: audit # TODO: change to 'egress-policy: block' after couple of runs

      - uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5.0.0
        with:
          submodules: recursive
          persist-credentials: false

      - name: Prepare
        run: |
          platform=${{ matrix.platform }}
          echo "PLATFORM_PAIR=${platform//\//-}" >> $GITHUB_ENV

      - name: Docker meta
        id: meta
        uses: docker/metadata-action@c299e40c65443455700f0fdfc63efafe5b349051 # v5.10.0
        with:
          images: |
            ${{ env.DOCKERHUB_REPO }}

      - name: Login to Docker Hub
        if: success() && github.repository == 'openthread/openthread' && github.event_name != 'pull_request'
        uses: docker/login-action@dbcb813823bdd20940b903addbd779551569679f # v4.6.0
        with:
          username: ${{ secrets.DOCKER_USERNAME }}
          password: ${{ secrets.DOCKER_PASSWORD }}

      - name: Set up Docker Buildx
        uses: docker/setup-buildx-action@37fe631027851001ddb9b187196cc803df7f5f0e # v4.3.0

      - name: Build and push by digest
        if: success()
        id: build
        uses: docker/build-push-action@f9f3042f7e2789586610d6e8b85c8f03e5195baf # v7.2.0
        with:
          file: etc/docker/environment/Dockerfile
          platforms: ${{ matrix.platform }}
          labels: ${{ steps.meta.outputs.labels }}
          outputs: type=image,"name=${{ env.DOCKERHUB_REPO }}",push-by-digest=true,name-canonical=true
          push: ${{ github.repository == 'openthread/openthread' && github.event_name != 'pull_request' }}

      - name: Export digest
        if: success() && github.repository == 'openthread/openthread' && github.event_name != 'pull_request'
        env:
          DIGEST: ${{ steps.build.outputs.digest }}
        run: |
          mkdir -p ${{ runner.temp }}/digests
          digest="${DIGEST}"
          touch "${{ runner.temp }}/digests/${digest#sha256:}"

      - name: Upload digest
        if: success() && github.repository == 'openthread/openthread' && github.event_name != 'pull_request'
        uses: actions/upload-artifact@043fb46d1a93c77aae656e7c1c64a875d1fc6a0a # v7.0.1
        with:
          name: digests-${{ env.PLATFORM_PAIR }}
          path: ${{ runner.temp }}/digests/*
          if-no-files-found: error
          retention-days: 1

  merge:
    if: success() && github.repository == 'openthread/openthread' && github.event_name != 'pull_request'
    runs-on: ubuntu-latest
    needs:
      - build
    steps:
      - name: Harden Runner
        uses: step-security/harden-runner@bf7454d06d71f1098171f2acdf0cd4708d7b5920 # v2.20.0
        with:
          egress-policy: audit # TODO: change to 'egress-policy: block' after couple of runs

      - name: Download digests
        uses: actions/download-artifact@3e5f45b2cfb9172054b4087a40e8e0b5a5461e7c # v8.0.1
        with:
          path: ${{ runner.temp }}/digests
          pattern: digests-*
          merge-multiple: true

      - name: Login to Docker Hub
        uses: docker/login-action@dbcb813823bdd20940b903addbd779551569679f # v4.6.0
        with:
          username: ${{ secrets.DOCKER_USERNAME }}
          password: ${{ secrets.DOCKER_PASSWORD }}

      - name: Set up Docker Buildx
        uses: docker/setup-buildx-action@37fe631027851001ddb9b187196cc803df7f5f0e # v4.3.0

      - name: Docker meta
        id: meta
        uses: docker/metadata-action@c299e40c65443455700f0fdfc63efafe5b349051 #	v5.10.0
        with:
          images: |
            ${{ env.DOCKERHUB_REPO }}
          tags: |
            type=ref,event=branch
            type=raw,value=latest,enable={{is_default_branch}}

      - name: Create manifest list and push
        working-directory: ${{ runner.temp }}/digests
        run: |
          docker buildx imagetools create $(jq -cr '.tags | map("-t " + .) | join(" ")' <<< "$DOCKER_METADATA_OUTPUT_JSON") \
            $(printf '${{ env.DOCKERHUB_REPO }}@sha256:%s ' *)

      - name: Inspect image
        run: |
          docker buildx imagetools inspect ${{ env.DOCKERHUB_REPO }}:${STEPS_META_OUTPUTS_VERSION}
        env:
          STEPS_META_OUTPUTS_VERSION: ${{ steps.meta.outputs.version }}