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:
  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: ${{ steps.ldflags.outputs.tree-state }}
    steps:
      - id: checkout
        uses: actions/checkout@692973e3d937129bcbf40652eb9f2f61becf3332 # v4
        with:
          fetch-depth: 0
      - id: ldflags
        run: |
          echo "commit=$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:
    needs:
      - ldflags_args
    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@692973e3d937129bcbf40652eb9f2f61becf3332 # v4
        with:
          fetch-depth: 0

      - name: Setup Go
        uses: actions/setup-go@0a12ed9d6a96ab950c8f026ed9f722fe0da7ef32 # v4
        with:
          go-version-file: 'go.mod'
          cache: true

      - name: Install Syft
        uses: anchore/sbom-action/download-syft@61119d458adab75f756bc0b9e4bde25725f86a7a # v0.17.2

      - name: Install Cosign
        uses: sigstore/cosign-installer@4959ce089c160fddf62f7b42464195ba1a56d382 # v3.6.0

      - name: Run GoReleaser
        id: run-goreleaser
        uses: goreleaser/goreleaser-action@286f3b13b1b49da4ac219696163fb8c1c93e1200 # v5
        with:
          distribution: goreleaser
          version: "~> v2"
          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 }}
          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 $ARTIFACTS | jq --raw-output '.[] | {name, "digest": (.extra.Digest // .extra.Checksum)} | select(.digest) | {digest} + {name} | join("  ") | sub("^sha256:";"")' | base64 -w0)
          if test "$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@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@3714a2a4684014deb874a0e737dffa0ee02dd647 # 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"