
name: Create and publish a Docker image

on:
  push:
    tags:
      - 'v*'
    branches:
      - 'master'

env:
  REGISTRY: ghcr.io
  IMAGE_NAME: ${{ github.repository }}

jobs:
  build-and-push-image:
    if: github.repository == 'restic/restic'
    runs-on: ubuntu-latest
    permissions:
      contents: read
      packages: write

    outputs:
      image: ${{ steps.image.outputs.image }}
      digest: ${{ steps.build-and-push.outputs.digest }}

    steps:
      - name: Checkout repository
        uses: actions/checkout@v6

      - name: Log in to the Container registry
        uses: docker/login-action@b45d80f862d83dbcd57f89517bcf500b2ab88fb2
        with:
          registry: ${{ env.REGISTRY }}
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}

      - name: Extract metadata (tags, labels) for Docker
        id: meta
        uses: docker/metadata-action@030e881283bb7a6894de51c315a6bfe6a94e05cf
        with:
          images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
          tags: |
            type=sha
            type=ref,event=branch
            type=semver,pattern={{version}}
            type=semver,pattern={{major}}.{{minor}}

      - name: Set up QEMU
        uses: docker/setup-qemu-action@ce360397dd3f832beb865e1373c09c0e9f86d70a

      - name: Set up Docker Buildx
        uses: docker/setup-buildx-action@4d04d5d9486b7bd6fa91e7baf45bbb4f8b9deedd

      - name: Ensure consistent binaries
        run: |
          echo "removing git directory for consistency with release binaries"
          rm -rf .git
        # remove VCS information from release builds, keep VCS for nightly builds on master
        if: github.ref != 'refs/heads/master'

      - name: Build and push Docker image
        id: build-and-push
        uses: docker/build-push-action@d08e5c354a6adb9ed34480a06d141179aa583294
        with:
          push: true
          context: .
          file: docker/Dockerfile.release
          platforms: linux/386,linux/amd64,linux/arm,linux/arm64
          pull: true
          tags: ${{ steps.meta.outputs.tags }}
          labels: ${{ steps.meta.outputs.labels }}
        
      - name: Output image
        id: image
        run: |
          # NOTE: Set the image as an output because the `env` context is not
          # available to the inputs of a reusable workflow call.
          image_name="${REGISTRY}/${IMAGE_NAME}"
          echo "image=$image_name" >> "$GITHUB_OUTPUT"
        
  provenance:
    needs: [build-and-push-image]
    permissions:
      actions: read # for detecting the Github Actions environment.
      id-token: write # for creating OIDC tokens for signing.
      packages: write # for uploading attestations.
    if: github.repository == 'restic/restic'
    uses: slsa-framework/slsa-github-generator/.github/workflows/generator_container_slsa3.yml@v2.1.0
    with:
      image: ${{ needs.build-and-push-image.outputs.image }}
      digest: ${{ needs.build-and-push-image.outputs.digest }}
      registry-username: ${{ github.actor }}
    secrets:
      registry-password: ${{ secrets.GITHUB_TOKEN }}