name: Build veilor-os OCI (BlueBuild)

# v0.7 spike — builds the bootable OCI image used by the bootstrap
# kickstart's `ostreecontainer` directive. Runs on the Forgejo
# self-hosted runner (label `nullstone`); GitHub-side cosign/SBOM/
# attest steps are gated off because Forgejo has no Sigstore Fulcio-
# trusted OIDC issuer (see docs/PROOF-OF-WORK.md, build-iso.yml fix).
#
# Reference: https://blue-build.org/how-to/setup-build-action/

on:
  push:
    branches: [v0.7-bluebuild-spike]
    paths:
      - 'bluebuild/**'
      - 'overlay/**'
      - 'assets/**'
      - 'scripts/**'
      - '.github/workflows/build-bluebuild.yml'
  pull_request:
    branches: [main, v0.7-bluebuild-spike]
  schedule:
    # Rebuild weekly so we pick up upstream secureblue + Fedora updates.
    - cron: '0 6 * * 1'
  workflow_dispatch:

permissions:
  contents: read

jobs:
  build:
    name: Build + push OCI
    # nullstone label resolves to veilor-build:43 (fedora43 + nodejs)
    # via runner config. Privileged + userns=host + sock pass-through
    # already wired in the runner config (see infra/forgejo/).
    runs-on: nullstone
    timeout-minutes: 60
    permissions:
      contents: read
      packages: write
      id-token: write           # for GH-only cosign keyless (skipped on Forgejo)
      attestations: write

    env:
      # Forgejo container registry path. PAT in FORGEJO_REGISTRY_TOKEN
      # secret has package:write on veilor-org.
      FORGEJO_REGISTRY: git.s8n.ru
      FORGEJO_IMAGE: git.s8n.ru/veilor-org/veilor-os
      OCI_TAG: "43"
      # GH parallel target — only used when run on github.com.
      GHCR_IMAGE: ghcr.io/${{ github.repository_owner }}/veilor-os

    steps:
      - name: Checkout
        # Pinned to last v4 tag confirmed to ship on node20.
        uses: actions/checkout@v4.1.7

      - name: Install build tooling (Fedora)
        run: |
          set -euxo pipefail
          dnf -y upgrade --refresh
          # veilor-build:43 already ships git, curl, tar, sudo, nodejs.
          # cosign is not packaged in Fedora 43; we install it from the
          # upstream release tarball below in a separate step.
          dnf -y install --skip-unavailable \
            podman \
            buildah \
            skopeo \
            jq

      - name: Install cosign binary (upstream release)
        run: |
          set -euxo pipefail
          # Fedora 43 has no cosign rpm. Pull static x86_64 binary
          # from sigstore/cosign GitHub releases. Pinned to v2.4.1.
          COSIGN_VERSION="2.4.1"
          curl -fsSL \
            "https://github.com/sigstore/cosign/releases/download/v${COSIGN_VERSION}/cosign-linux-amd64" \
            -o /usr/local/bin/cosign
          chmod +x /usr/local/bin/cosign
          cosign version

      - name: Build OCI image with BlueBuild action
        id: bluebuild
        # Composite action — runs podman + buildah inside; works on
        # Forgejo runner same as GH-hosted. Pinned to commit SHA per
        # the v0.5 CI hardening pass.
        uses: blue-build/github-action@24d146df25adc2cf579e918efe2d9bff6adea408 # v1
        with:
          recipe: bluebuild/recipe.yml
          # registry_token is consumed by the action to publish; for
          # the Forgejo path we re-tag + push manually below, so this
          # token only matters for the GH-mirror path.
          registry_token: ${{ secrets.GITHUB_TOKEN }}
          pr_event_number: ${{ github.event.number }}
          maximize_build_space: false

      - name: Re-tag local OCI for Forgejo + GHCR
        run: |
          set -euxo pipefail
          # The action emits the local image as `<recipe-name>:<tag>`.
          # Confirm it landed, then add registry-prefixed tags.
          podman images
          podman tag localhost/veilor-os:latest "${FORGEJO_IMAGE}:${OCI_TAG}" || true
          podman tag localhost/veilor-os:latest "${FORGEJO_IMAGE}:latest" || true

      - name: Push to Forgejo registry (primary)
        if: success() && github.event_name != 'pull_request' && github.server_url != 'https://github.com'
        env:
          FORGEJO_REGISTRY_TOKEN: ${{ secrets.FORGEJO_REGISTRY_TOKEN }}
          FORGEJO_REGISTRY_USER: ${{ secrets.FORGEJO_REGISTRY_USER }}
        run: |
          set -euo pipefail
          if [ -z "${FORGEJO_REGISTRY_TOKEN:-}" ]; then
            echo "[WARN] FORGEJO_REGISTRY_TOKEN secret is empty; skipping push"
            exit 0
          fi
          echo "$FORGEJO_REGISTRY_TOKEN" | podman login \
            --username "${FORGEJO_REGISTRY_USER:-veilor-org}" \
            --password-stdin "$FORGEJO_REGISTRY"
          podman push "${FORGEJO_IMAGE}:${OCI_TAG}"
          podman push "${FORGEJO_IMAGE}:latest"
          echo "[OK] pushed ${FORGEJO_IMAGE}:{${OCI_TAG},latest}"

      - name: Push to GHCR (mirror, GitHub-only)
        if: success() && github.event_name != 'pull_request' && github.server_url == 'https://github.com'
        run: |
          set -euo pipefail
          podman tag localhost/veilor-os:latest "${GHCR_IMAGE}:${OCI_TAG}"
          podman tag localhost/veilor-os:latest "${GHCR_IMAGE}:latest"
          echo "${{ secrets.GITHUB_TOKEN }}" | podman login \
            --username "${{ github.repository_owner }}" \
            --password-stdin ghcr.io
          podman push "${GHCR_IMAGE}:${OCI_TAG}"
          podman push "${GHCR_IMAGE}:latest"

      - name: Smoke-test OCI image
        if: github.event_name == 'push' || github.event_name == 'workflow_dispatch'
        run: |
          set -euxo pipefail
          podman run --rm "localhost/veilor-os:latest" /bin/bash -c '
            set -e
            echo "-- os-release"
            head -5 /etc/os-release
            echo "-- sudo present"; which sudo
            echo "-- mullvad-browser path"; rpm -q mullvad-browser || echo "not installed"
            echo "-- yggdrasil"; rpm -q yggdrasil || echo "not installed"
            echo "-- tailscale"; rpm -q tailscale || echo "not installed"
            echo "-- veilor-firstboot unit"; ls -la /etc/systemd/system/veilor-firstboot.service 2>&1 || true
          '

      # ── GitHub-only signing/SBOM/attest ────────────────────────────
      # cosign keyless needs Sigstore Fulcio-trusted OIDC. Forgejo
      # has none, so these are GH-only. v0.7+ TODO: cosign key-pair
      # signing for Forgejo using a stored secret.

      - name: SBOM (SPDX, GitHub-only)
        if: github.event_name == 'push' && github.server_url == 'https://github.com'
        # Pinned to last v0.17 release that ships node20.
        uses: anchore/sbom-action@v0.17.2
        with:
          image: ${{ env.GHCR_IMAGE }}:${{ env.OCI_TAG }}
          format: spdx-json
          output-file: veilor-os-oci.spdx.json

      - name: Build provenance attestation (GitHub-only)
        if: github.event_name == 'push' && github.server_url == 'https://github.com'
        # Pinned to last v2.2 release that ships node20.
        uses: actions/attest-build-provenance@v2.2.3
        with:
          subject-name: ${{ env.GHCR_IMAGE }}
          subject-digest: ${{ steps.bluebuild.outputs.digest }}