goreleaser.yml

name: goreleaser

on:
  push:
    tags:
      - "v*" # triggers only if push new tag version, like `0.8.4` or else

jobs:
  goreleaser:
    outputs:
      hashes: ${{ steps.binary.outputs.hashes }}
      image: ${{ steps.image.outputs.name }}
      digest: ${{ steps.image.outputs.digest }}
    runs-on: ubuntu-latest
    permissions:
      contents: write
      packages: write
      id-token: write
    steps:
      - name: Checkout
        uses: actions/checkout@v4
        with:
          fetch-depth: 0
      - name: Set up Go
        uses: actions/setup-go@v5.0.0
        with:
          go-version: "1.21"
          check-latest: true
      - uses: docker/login-action@v1
        with:
          registry: ghcr.io
          username: ${{ github.repository_owner }}
          password: ${{ secrets.GITHUB_TOKEN }}
      - name: Run GoReleaser
        id: goreleaser
        uses: goreleaser/goreleaser-action@v5
        with:
          version: latest
          args: release --rm-dist
        env:
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
      - name: Generate binary hashes
        id: binary
        env:
          ARTIFACTS: "${{ steps.goreleaser.outputs.artifacts }}"
        run: |
          set -euo pipefail

          checksum_file=$(echo "$ARTIFACTS" | jq -r '.[] | select (.type=="Checksum") | .path')
          echo "hashes=$(cat $checksum_file | base64 -w0)" >> "$GITHUB_OUTPUT"
      - name: Image digest
        id: image
        env:
          ARTIFACTS: "${{ steps.goreleaser.outputs.artifacts }}"
        run: |
          set -euo pipefail
          image_and_digest=$(echo "$ARTIFACTS" | jq -r '.[] | select (.type=="Docker Manifest") | .path')
          image=$(echo "${image_and_digest}" | cut -d'@' -f1 | cut -d':' -f1)
          digest=$(echo "${image_and_digest}" | cut -d'@' -f2)
          echo "name=$image" >> "$GITHUB_OUTPUT"
          echo "digest=$digest" >> "$GITHUB_OUTPUT"

  binary-provenance:
    needs: [goreleaser]
    permissions:
      actions: read # To read the workflow path.
      id-token: write # To sign the provenance.
      contents: write # To add assets to a release.
    uses: slsa-framework/slsa-github-generator/.github/workflows/generator_generic_slsa3.yml@v1.9.0
    with:
      base64-subjects: "${{ needs.goreleaser.outputs.hashes }}"
      upload-assets: true # upload to a new release

  image-provenance:
    needs: [goreleaser]
    permissions:
      actions: read
      id-token: write
      packages: write
    uses: slsa-framework/slsa-github-generator/.github/workflows/generator_container_slsa3.yml@v1.9.0
    with:
      image: ${{ needs.goreleaser.outputs.image }}
      digest: ${{ needs.goreleaser.outputs.digest }}
      registry-username: ${{ github.actor }}
    secrets:
      registry-password: ${{ secrets.GITHUB_TOKEN }}

  verification-with-slsa-verifier:
    needs: [goreleaser, binary-provenance]
    runs-on: ubuntu-latest
    permissions: read-all
    steps:
      - name: Install the verifier
        uses: slsa-framework/slsa-verifier/actions/installer@v2.4.0

      - name: Download assets
        env:
          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
          PROVENANCE: "${{ needs.binary-provenance.outputs.provenance-name }}"
        run: |
          set -euo pipefail
          gh -R "$GITHUB_REPOSITORY" release download "$GITHUB_REF_NAME" -p "*.tar.gz"
          gh -R "$GITHUB_REPOSITORY" release download "$GITHUB_REF_NAME" -p "*.zip"
          gh -R "$GITHUB_REPOSITORY" release download "$GITHUB_REF_NAME" -p "$PROVENANCE"
      - name: Verify assets
        env:
          CHECKSUMS: ${{ needs.goreleaser.outputs.hashes }}
          PROVENANCE: "${{ needs.binary-provenance.outputs.provenance-name }}"
        run: |
          set -euo pipefail
          checksums=$(echo "$CHECKSUMS" | base64 -d)
          while read -r line; do
              fn=$(echo $line | cut -d ' ' -f2)
              echo "Verifying $fn"
              slsa-verifier verify-artifact --provenance-path "$PROVENANCE" \
                                            --source-uri "github.com/$GITHUB_REPOSITORY" \
                                            --source-tag "$GITHUB_REF_NAME" \
                                            "$fn"
          done <<<"$checksums"

  verification-with-cosign:
    needs: [goreleaser, image-provenance]
    runs-on: ubuntu-latest
    permissions: read-all
    steps:
      - name: Login
        uses: docker/login-action@343f7c4344506bcbf9b4de18042ae17996df046d # v3.0.0
        with:
          registry: ghcr.io
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}

      - name: Install Cosign
        uses: sigstore/cosign-installer@11086d25041f77fe8fe7b9ea4e48e3b9192b8f19 # v3.1.2

      - name: Verify image
        env:
          IMAGE: ${{ needs.goreleaser.outputs.image }}
          DIGEST: ${{ needs.goreleaser.outputs.digest }}
        run: |
          cosign verify-attestation \
             --type slsaprovenance \
             --certificate-oidc-issuer https://token.actions.githubusercontent.com \
             --certificate-identity-regexp '^https://github.com/slsa-framework/slsa-github-generator/.github/workflows/generator_container_slsa3.yml@refs/tags/v[0-9]+.[0-9]+.[0-9]+$' \
             $IMAGE@$DIGEST