releaser.yml

name: Release
on:
  workflow_dispatch:
  release:
    types: [created]
permissions:
  contents: write
jobs:
  ldflags_args:
    runs-on: ubuntu-latest
    outputs:
      commit-date: ${{ steps.ldflags.outputs.commit-date }}
      commit: ${{ steps.ldflags.outputs.commit }}
      version: ${{ steps.ldflags.outputs.version }}
      tree-state: ${{ steps.ldflags.outputs.tree-state }}
    steps:
      - id: checkout
        uses: actions/checkout@v4
        with:
          fetch-depth: 0
      - id: ldflags
        run: |
          echo "commit=$GITHUB_SHA" >> $GITHUB_OUTPUT
          echo "commit-date=$(git log --date=iso8601-strict -1 --pretty=%ct)" >> $GITHUB_OUTPUT
          echo "version=$(git describe --tags --always --dirty | cut -c2-)" >> $GITHUB_OUTPUT
          echo "tree-state=$(if git diff --quiet; then echo "clean"; else echo "dirty"; fi)" >> $GITHUB_OUTPUT
  release:
    name: Build and release
    needs:
      - ldflags_args
    outputs:
      hashes: ${{ steps.hash.outputs.hashes }}
    permissions:
      contents: write # To add assets to a release.
      id-token: write # To do keyless signing with cosign
    runs-on: macos-latest
    steps:
      - name: Checkout
        uses: actions/checkout@v4
        with:
          fetch-depth: 0
      - name: Setup Go
        uses: actions/setup-go@v5
        with:
          go-version-file: 'go.mod'
          cache: true
      - name: Install Syft
        uses: anchore/sbom-action/download-syft@ab9d16d4b419c9d1a02df5213fa0ebe965ca5a57 # v0.17.1
      - name: Install Cosign
        uses: sigstore/cosign-installer@v3.6.0
      - name: Run GoReleaser
        id: run-goreleaser
        uses: goreleaser/goreleaser-action@v6
        with:
          distribution: goreleaser
          version: latest
          args: release --clean
        env:
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
          HOMEBREW_TAP_GITHUB_TOKEN: ${{ secrets.HOMEBREW_TAP_GITHUB_TOKEN }}
          VERSION: ${{ needs.ldflags_args.outputs.version }}
          COMMIT: ${{ needs.ldflags_args.outputs.commit }}
          COMMIT_DATE: ${{ needs.ldflags_args.outputs.commit-date }}
          TREE_STATE: ${{ needs.ldflags_args.outputs.tree-state }}
      - name: Generate subject
        id: hash
        env:
          ARTIFACTS: "${{ steps.run-goreleaser.outputs.artifacts }}"
        run: |
          set -euo pipefail
          hashes=$(echo $ARTIFACTS | jq --raw-output '.[] | {name, "digest": (.extra.Digest // .extra.Checksum)} | select(.digest) | {digest} + {name} | join("  ") | sub("^sha256:";"")' | base64)
          if test "$hashes" = ""; then # goreleaser < v1.13.0
            checksum_file=$(echo "$ARTIFACTS" | jq -r '.[] | select (.type=="Checksum") | .path')
            hashes=$(cat $checksum_file | base64)
          fi
          echo "hashes=$hashes" >> $GITHUB_OUTPUT
  provenance:
    name: Generate provenance (SLSA3)
    needs:
      - release
    permissions:
      actions: read # To read the workflow path.
      id-token: write # To sign the provenance.
      contents: write # To add assets to a release.
    uses: slsa-framework/slsa-github-generator/.github/workflows/generator_generic_slsa3.yml@v2.0.0
    with:
      base64-subjects: "${{ needs.release.outputs.hashes }}"
      upload-assets: true # upload to a new release
  verification:
    name: Verify provenance of assets (SLSA3)
    needs:
      - release
      - provenance
    runs-on: ubuntu-latest
    permissions: read-all
    steps:
      - name: Install the SLSA verifier
        uses: slsa-framework/slsa-verifier/actions/installer@v2.6.0
      - name: Download assets
        env:
          GH_TOKEN: "${{ secrets.GITHUB_TOKEN }}"
          CHECKSUMS: "${{ needs.release.outputs.hashes }}"
          ATT_FILE_NAME: "${{ needs.provenance.outputs.provenance-name }}"
        run: |
          set -euo pipefail
          checksums=$(echo "$CHECKSUMS" | base64 -d)
          while read -r line; do
              fn=$(echo $line | cut -d ' ' -f2)
              echo "Downloading $fn"
              gh -R "$GITHUB_REPOSITORY" release download "$GITHUB_REF_NAME" -p "$fn"
          done <<<"$checksums"
          gh -R "$GITHUB_REPOSITORY" release download "$GITHUB_REF_NAME" -p "$ATT_FILE_NAME"
      - name: Verify assets
        env:
          CHECKSUMS: "${{ needs.release.outputs.hashes }}"
          PROVENANCE: "${{ needs.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 SLSA provenance for $fn"
              slsa-verifier verify-artifact --provenance-path "$PROVENANCE" \
                                            --source-uri "github.com/$GITHUB_REPOSITORY" \
                                            --source-tag "$GITHUB_REF_NAME" \
                                            "$fn"
          done <<<"$checksums"