release-homebrew.yml

name: Release + Homebrew
# Maintainer notes:
# - Required secret in this repo: HOMEBREW_TAP_TOKEN
#   Token must be able to push to the tap repository.
# - Optional repo variable: HOMEBREW_TAP_REPO (format: owner/repo)
# - If HOMEBREW_TAP_REPO is unset, default tap is <repo-owner>/homebrew-capa.

on:
  release:
    types: [published]
  workflow_dispatch:
    inputs:
      version:
        description: "Version without leading v (e.g. 0.2.0)"
        required: true

permissions:
  contents: write

jobs:
  publish:
    runs-on: macos-15
    env:
      BIN_NAME: capa
      REPO_OWNER: ${{ github.repository_owner }}
      REPO_NAME: ${{ github.event.repository.name }}
      TAP_REPO: ${{ vars.HOMEBREW_TAP_REPO }}
    steps:
      - name: Checkout
        uses: actions/checkout@v4

      - name: Resolve version
        id: version
        shell: bash
        run: |
          set -euo pipefail
          if [[ "${{ github.event_name }}" == "release" ]]; then
            tag="${{ github.event.release.tag_name }}"
            version="${tag#v}"
          else
            version="${{ inputs.version }}"
            tag="v${version}"
          fi
          echo "tag=$tag" >> "$GITHUB_OUTPUT"
          echo "version=$version" >> "$GITHUB_OUTPUT"

      - name: Build release binary
        shell: bash
        run: swift build -c release

      - name: Validate CLI version matches release version
        shell: bash
        run: |
          set -euo pipefail
          expected="${{ steps.version.outputs.version }}"
          actual="$(.build/release/${BIN_NAME} --version | tr -d '[:space:]')"
          if [[ "$actual" != "$expected" ]]; then
            echo "Version mismatch: binary reports '$actual' but release expects '$expected'." >&2
            exit 1
          fi

      - name: Package artifact
        id: package
        shell: bash
        run: |
          set -euo pipefail
          version="${{ steps.version.outputs.version }}"
          artifact="${BIN_NAME}-v${version}-macos-arm64.tar.gz"
          mkdir -p dist
          cp ".build/release/${BIN_NAME}" "dist/${BIN_NAME}"
          tar -C dist -czf "dist/${artifact}" "${BIN_NAME}"
          sha=$(shasum -a 256 "dist/${artifact}" | awk '{print $1}')
          echo "artifact=$artifact" >> "$GITHUB_OUTPUT"
          echo "sha256=$sha" >> "$GITHUB_OUTPUT"

      - name: Upload release asset
        uses: softprops/action-gh-release@v2
        with:
          tag_name: ${{ steps.version.outputs.tag }}
          files: dist/${{ steps.package.outputs.artifact }}
          fail_on_unmatched_files: true
          generate_release_notes: false

      - name: Select tap repo
        id: tap
        shell: bash
        run: |
          set -euo pipefail
          # Allow overriding the tap repo via Actions variable.
          tap_repo="${TAP_REPO}"
          if [[ -z "$tap_repo" ]]; then
            # Default tap naming convention for this project.
            tap_repo="${REPO_OWNER}/homebrew-capa"
          fi
          echo "repo=$tap_repo" >> "$GITHUB_OUTPUT"

      - name: Update Homebrew tap formula
        shell: bash
        env:
          # PAT used to clone/push the tap repository.
          GH_TOKEN: ${{ secrets.HOMEBREW_TAP_TOKEN }}
        run: |
          set -euo pipefail
          if [[ -z "${GH_TOKEN}" ]]; then
            echo "HOMEBREW_TAP_TOKEN is not set; skipping tap update." >&2
            exit 1
          fi

          tag="${{ steps.version.outputs.tag }}"
          version="${{ steps.version.outputs.version }}"
          artifact="${{ steps.package.outputs.artifact }}"
          sha="${{ steps.package.outputs.sha256 }}"
          tap_repo="${{ steps.tap.outputs.repo }}"
          asset_url="https://github.com/${REPO_OWNER}/${REPO_NAME}/releases/download/${tag}/${artifact}"

          temp_dir="$(mktemp -d)"
          trap 'rm -rf "$temp_dir"' EXIT

          git clone "https://x-access-token:${GH_TOKEN}@github.com/${tap_repo}.git" "$temp_dir/tap"
          mkdir -p "$temp_dir/tap/Formula"

          scripts/generate_homebrew_formula.sh "$version" "$asset_url" "$sha" > "$temp_dir/tap/Formula/capa.rb"

          pushd "$temp_dir/tap" > /dev/null
          git config user.name "github-actions[bot]"
          git config user.email "github-actions[bot]@users.noreply.github.com"
          git add Formula/capa.rb
          if git diff --cached --quiet; then
            echo "No formula changes to commit."
            exit 0
          fi
          git commit -m "capa ${version}"
          git push origin HEAD
          popd > /dev/null