releaser.yml

#
# Copyright 2023 Stacklok, Inc.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
# This workflow compiles frizbee using a SLSA3 compliant
# build and then verifies the provenance of the built artifacts.
# It releases the following architectures: amd64, arm64, and armv7 on Linux, 
# Windows, and macOS.
# The provenance file can be verified using https://github.com/slsa-framework/slsa-verifier.
# For more information about SLSA and how it improves the supply-chain, visit slsa.dev.

name: Release
on:
  push:
    tags:
      - '*'

permissions:
  contents: write

jobs:
  release:
    name: Build and release
    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: ubuntu-latest
    steps:
      - name: Checkout
        uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11 # v4
        with:
          fetch-depth: 0

      - name: Setup Go
        uses: actions/setup-go@0c52d547c9bc32b1aa3301fd7a9cb496313a4491 # v4
        with:
          go-version-file: 'go.mod'
          cache: true

      - name: Install Syft
        uses: anchore/sbom-action/download-syft@5ecf649a417b8ae17dc8383dc32d46c03f2312df # v0.15.1

      - name: Install Cosign
        uses: sigstore/cosign-installer@9614fae9e5c5eddabb09f90a270fcb487c9f7149 # v3.3.0

      - name: Run GoReleaser
        id: run-goreleaser
        uses: goreleaser/goreleaser-action@7ec5c2b0c6cdda6e8bbb49444bc797dd33d74dd8 # v5
        with:
          distribution: goreleaser
          version: latest
          args: release --clean
        env:
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
          HOMEBREW_TAP_GITHUB_TOKEN: ${{ secrets.HOMEBREW_TAP_GITHUB_TOKEN }}
          WINGET_GITHUB_TOKEN: ${{ secrets.WINGET_GITHUB_TOKEN }}

      - name: Generate subject
        id: hash
        env:
          ARTIFACTS: "${{ steps.run-goreleaser.outputs.artifacts }}"
        run: |
          set -euo pipefail
          hashes=$(echo $ARTIFACTS | jq --raw-output '.[] | {name, "digest": (.extra.Digest // .extra.Checksum)} | select(.digest) | {digest} + {name} | join("  ") | sub("^sha256:";"")' | base64 -w0)
          if test "$hashes" = ""; then # goreleaser < v1.13.0
            checksum_file=$(echo "$ARTIFACTS" | jq -r '.[] | select (.type=="Checksum") | .path')
            hashes=$(cat $checksum_file | base64 -w0)
          fi
          echo "hashes=$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@v1.9.0
    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@7e1e47d7d793930ab0082c15c2b971fdb53a3c95 # v2.4.1
      - 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"