# The whole pipeline: checks on every push, and on main/tags an image published to
# GHCR. One file rather than one per check, because the gating relationship IS the
# pipeline — `publish` names its prerequisites in `needs`, so a check can't go red
# while an image ships. TestBuildDependsOnEveryGatingJob asserts that wiring.
#
# There is no deploy step: deployment lives in a separate infrastructure repository,
# which resolves the published tag to a digest and rolls it out. What this workflow
# owes that deployer is the digest itself — see the `publish` job's summary output,
# and "Verifying a build" in README.md for why the digest (not a tag) is the thing
# that gets deployed and reported by /version.
#
# There is no Dockerfile. MeshTender is a pure-Go binary with migrations, templates,
# and static assets embedded via go:embed, so ko compiles it and lays it straight
# onto the digest-pinned base image from .ko.yaml — no build context and no daemon.
name: CI

on:
  push:
    branches: ["**"]
    tags: ["v*"]
  workflow_dispatch:

# A newer push to the same ref makes an in-flight run pointless. Tags are excluded
# from cancellation by using the ref itself as the group: two different tags never
# collide, so a release build always runs to completion.
concurrency:
  group: ci-${{ github.ref }}
  cancel-in-progress: true

permissions:
  contents: read

# Go's version is read from go.mod rather than written here: it is already pinned
# exactly (TestReleasePinsAreConsistent enforces that it matches the mise pin), and
# a second copy in this file is a second thing to forget. GOTOOLCHAIN=local then
# forbids fetching any other toolchain, so a build can only ever use the pinned one
# — the compiler version changes the binary, and the published image is meant to be
# reproducible from a clean checkout.
env:
  GOTOOLCHAIN: local

jobs:
  lint:
    runs-on: ubuntu-latest
    timeout-minutes: 10
    steps:
      - uses: actions/checkout@v7.0.1
      - uses: actions/setup-go@v7.0.0
        with:
          go-version-file: go.mod
          # Caches the module cache AND the build cache, keyed on go.sum, shared
          # across jobs and runs. Every job below compiles the same module, so this
          # is the difference between each one starting cold and starting warm.
          cache-dependency-path: go.sum
      # The action major has to match golangci-lint's major: v6 of the action only
      # drives golangci-lint v1, and .golangci.yml declares `version: "2"`.
      # TestLintVersionsAgree pins that relationship down.
      #
      # Both versions are pinned rather than "latest": a new release both invalidates
      # this action's analysis cache and can fail a build with no code change behind
      # it. Bump deliberately. (mise runs "latest" locally, where a surprise is cheap.)
      - uses: golangci/golangci-lint-action@v9.3.0
        with:
          version: v2.13.1

  test:
    runs-on: ubuntu-latest
    timeout-minutes: 20
    services:
      # ONE Postgres for the whole run. internal/testdb clones a migrated template
      # database per test against whatever server this points at; without it, every
      # package binary starts its own container via testcontainers, and `go test
      # ./...` runs packages in parallel — which on a 4-vCPU runner meant ~8 Postgres
      # containers competing for CPU until connections started failing.
      postgres:
        image: postgres:17
        env:
          POSTGRES_USER: meshtender
          POSTGRES_PASSWORD: meshtender
          POSTGRES_DB: meshtender_test
        ports:
          - 5432:5432
        options: >-
          --health-cmd "pg_isready -U meshtender"
          --health-interval 5s
          --health-timeout 5s
          --health-retries 10
    env:
      # The harness creates and drops only its own mt_tmpl_* / mt_test_* databases
      # on this server, so pointing at the "postgres" maintenance DB is safe.
      MESHTENDER_TEST_DATABASE_URL: postgres://meshtender:meshtender@localhost:5432/postgres?sslmode=disable
    steps:
      - uses: actions/checkout@v7.0.1
      - uses: actions/setup-go@v7.0.0
        with:
          go-version-file: go.mod
          # Caches the module cache AND the build cache, keyed on go.sum, shared
          # across jobs and runs. Every job below compiles the same module, so this
          # is the difference between each one starting cold and starting warm.
          cache-dependency-path: go.sum
      # No `go vet` here: golangci-lint's standard set includes govet and runs it in
      # a parallel job, so vetting again would buy a second full analysis pass of the
      # module and nothing else. It stays in the local pre-push gate (CLAUDE.md).
      - run: go test -race ./...

  vuln:
    runs-on: ubuntu-latest
    timeout-minutes: 10
    steps:
      - uses: actions/checkout@v7.0.1
      - uses: actions/setup-go@v7.0.0
        with:
          go-version-file: go.mod
          # Caches the module cache AND the build cache, keyed on go.sum, shared
          # across jobs and runs. Every job below compiles the same module, so this
          # is the difference between each one starting cold and starting warm.
          cache-dependency-path: go.sum
      # Pinned so the compiled tool stays in the build cache between runs; the vuln
      # database is fetched at run time, so this doesn't stale what it checks against.
      - run: go install golang.org/x/vuln/cmd/govulncheck@v1.7.0
      - run: govulncheck ./...

  # The licensing audit gates publishing for the same reason the vuln scan does: a
  # non-permissive dependency is a legal defect in the artifact, so it must not
  # reach the registry.
  licenses:
    runs-on: ubuntu-latest
    timeout-minutes: 10
    steps:
      - uses: actions/checkout@v7.0.1
      - uses: actions/setup-go@v7.0.0
        with:
          go-version-file: go.mod
          # Caches the module cache AND the build cache, keyed on go.sum, shared
          # across jobs and runs. Every job below compiles the same module, so this
          # is the difference between each one starting cold and starting warm.
          cache-dependency-path: go.sum
      - run: go run ./cmd/licenses

  # Non-gating on purpose (it is absent from publish's `needs`): the browser suite
  # skips rather than fails when no browser is reachable, so requiring it would make
  # releases depend on an advisory check.
  e2e:
    runs-on: ubuntu-latest
    timeout-minutes: 20
    services:
      # ONE Postgres for the whole run. internal/testdb clones a migrated template
      # database per test against whatever server this points at; without it, every
      # package binary starts its own container via testcontainers, and `go test
      # ./...` runs packages in parallel — which on a 4-vCPU runner meant ~8 Postgres
      # containers competing for CPU until connections started failing.
      postgres:
        image: postgres:17
        env:
          POSTGRES_USER: meshtender
          POSTGRES_PASSWORD: meshtender
          POSTGRES_DB: meshtender_test
        ports:
          - 5432:5432
        options: >-
          --health-cmd "pg_isready -U meshtender"
          --health-interval 5s
          --health-timeout 5s
          --health-retries 10
    env:
      MESHTENDER_TEST_DATABASE_URL: postgres://meshtender:meshtender@localhost:5432/postgres?sslmode=disable
    steps:
      - uses: actions/checkout@v7.0.1
      - uses: actions/setup-go@v7.0.0
        with:
          go-version-file: go.mod
          # Caches the module cache AND the build cache, keyed on go.sum, shared
          # across jobs and runs. Every job below compiles the same module, so this
          # is the difference between each one starting cold and starting warm.
          cache-dependency-path: go.sum
      # The browser container is started here rather than as a `services:` entry
      # because it needs a custom command (socat fronts the debugger, which
      # headless-shell binds to loopback inside the container) and services accept
      # only an image plus options. This mirrors `mise run e2e`, which is the local
      # equivalent — keep the two in step. The task itself isn't reused because it
      # assumes a developer's .env.
      - name: Start headless browser
        run: |
          docker run -d --rm --name mt-headless -p 9222:9222 \
            --add-host=host.docker.internal:host-gateway \
            --entrypoint bash chromedp/headless-shell:latest -c \
            'socat TCP4-LISTEN:9222,fork TCP4:127.0.0.1:9223 & exec /headless-shell/headless-shell --no-sandbox --use-gl=angle --use-angle=swiftshader --remote-debugging-address=0.0.0.0 --remote-debugging-port=9223 "--host-resolver-rules=MAP *.host.docker.internal host.docker.internal"'
          # Bounded readiness wait (~20s) so a container that never comes up can't hang.
          for _ in $(seq 1 40); do
            curl -sf http://127.0.0.1:9222/json/version >/dev/null 2>&1 && break
            sleep 0.5
          done
      # The harness defaults (127.0.0.1:9222 for the debugger, host.docker.internal
      # for how the browser reaches the test server) match the container above, so
      # no E2E_* overrides are needed.
      - run: go test -tags browser ./internal/e2e/ -timeout 15m
      - if: always()
        run: docker rm -f mt-headless

  publish:
    # Every gating check, and deliberately not e2e. Adding a check job means adding
    # it here; TestBuildDependsOnEveryGatingJob fails if you forget.
    needs: [lint, test, vuln, licenses]
    if: github.ref == 'refs/heads/main' || startsWith(github.ref, 'refs/tags/')
    runs-on: ubuntu-latest
    timeout-minutes: 20
    permissions:
      contents: read
      packages: write
      # For the provenance attestation below.
      id-token: write
      attestations: write
    env:
      # Lowercase literal rather than github.repository: GHCR paths must be
      # lowercase, and this repository's name is mixed case.
      KO_DOCKER_REPO: ghcr.io/meshtender/meshtender
      # ko is a build input — a different ko can lay out layers differently — so its
      # version is pinned here and checked against the mise pin.
      KO_VERSION: v0.19.1
    outputs:
      image: ${{ steps.build.outputs.image }}
      digest: ${{ steps.build.outputs.digest }}
    steps:
      - uses: actions/checkout@v7.0.1
      - uses: actions/setup-go@v7.0.0
        with:
          go-version-file: go.mod
          # Caches the module cache AND the build cache, keyed on go.sum, shared
          # across jobs and runs. Every job below compiles the same module, so this
          # is the difference between each one starting cold and starting warm.
          cache-dependency-path: go.sum
      # The official release binary, which is the same artifact mise installs locally
      # (its aqua backend downloads the release, it does not build ko either) — so CI
      # and a developer now run byte-identical ko. Compiling it from source here cost
      # ~50s per publish and bought nothing: what affects the image is ko's VERSION,
      # which decides layer layout, plus the Go on PATH that ko invokes to build the
      # app. The Go that built ko itself never touches the artifact.
      - uses: ko-build/setup-ko@v0.10
        with:
          version: ${{ env.KO_VERSION }}
      # An unresolved version input would leave setup-ko installing something other
      # than the pin, silently — and an unpinned ko is an unreproducible image. Fail
      # here instead, where the message says so.
      - run: |
          if ! ko version | grep -q "${KO_VERSION#v}"; then
            echo "ko is $(ko version), want ${KO_VERSION#v} — the pinned version did not install" >&2
            exit 1
          fi
      # setup-ko only logs in when KO_DOCKER_REPO is unset, and it is set above, so
      # authenticate explicitly.
      - run: echo "${{ secrets.GITHUB_TOKEN }}" | ko login ghcr.io --username ${{ github.actor }} --password-stdin

      - name: Build and push
        id: build
        run: |
          # --bare publishes to exactly $KO_DOCKER_REPO instead of appending a
          # package-name/hash suffix. --image-refs records the published reference
          # INCLUDING its digest, which is the value the deployer needs: a binary
          # cannot derive its own image digest, so it has to be handed in as
          # MESHTENDER_IMAGE_DIGEST for /version to report it.
          if [ "${GITHUB_REF_TYPE}" = "tag" ]; then
            # Strip a leading "v" so v1.2.3 -> 1.2.3.
            tags="${GITHUB_REF_NAME#v},latest"
          else
            # The commit SHA is the immutable handle; "main" is the moving tag a
            # deployer watches, resolving it to a digest before rolling out.
            tags="${GITHUB_SHA},main"
          fi
          ko build --bare --tags "$tags" --image-refs image-ref --sbom=spdx ./cmd/meshtender
          ref="$(cat image-ref)"
          echo "image=${ref%@*}" >> "$GITHUB_OUTPUT"
          echo "digest=${ref#*@}" >> "$GITHUB_OUTPUT"
          {
            echo "### Published"
            echo
            echo '```'
            echo "$ref"
            echo '```'
            echo
            echo "Deploy by digest and pass the same digest as \`MESHTENDER_IMAGE_DIGEST\`."
          } >> "$GITHUB_STEP_SUMMARY"

      # Signed provenance tying this digest to this workflow and commit. The point
      # of a reproducible build is that an outsider can check our claims; this lets
      # them check the publisher too, without trusting the registry.
      - uses: actions/attest-build-provenance@v4.2.2
        with:
          subject-name: ${{ steps.build.outputs.image }}
          subject-digest: ${{ steps.build.outputs.digest }}
          push-to-registry: true