docs: Cloudflare Workers hosting pipeline (apex, content workers, CI, previews) (#2140)

* docs-infra: scaffold Cloudflare workers workspace (versions.json v2, matrix, toolchain)

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* docs-infra: record full Phase-0 plan decision in workers/PLAN.md

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* docs-infra: shared content worker — asset serving, cache classes, X-Docs-Build, canary no-store

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* docs-infra: run worker script before assets; test fetch entrypoint

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* docs-infra: apex manifest loader + dispatch map + runtime binding guard (TDD)

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* docs-infra: apex redirects (aliases, PDF, trailing-slash) + special paths (TDD)

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* docs-infra: PDF redirect honors pdf:null and preserves query

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* docs-infra: apex UA gate — allowlist-wins, log-only AI crawlers, empty block list at launch

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* docs-infra: apex router (pipeline §3.2), themed 404/503, /kb seam, env configs + congruence test

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* docs-infra: add missing-User-Agent regression test for apex UA gate

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* docs-infra: R2-streaming preview worker — MIME map, noindex, no-store (TDD)

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* docs-infra: preview 404 no-store + fetch handler tests

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* docs-infra: bootstrap script — binding-target workers must exist before apex deploys

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* docs-infra: apex run_worker_first, lockfile for npm ci, PDF Location from manifest

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* docs-infra: derive html_baseurl from DOCS_VERSION_SLUG with RTD fallback (canonical gate prereq)

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* docs-infra: version picker + status banner + language scaffold (vanilla JS, TDD pure core)

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* docs-infra: picker preserves query+hash across switch; valid breadcrumb markup

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* docs-infra: Pagefind search wrapper with runtime base-path + preview prefix handling (TDD)

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* docs-infra: pagefind wrapper — asset-failure notice + UI stylesheet load

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* docs-infra: gate Pagefind searchbox to CF builds (RTD keeps stock search until cutover)

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* docs-infra: deploy sanity gates — limits, critical pages, count-delta, canonical (TDD)

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* docs-infra: hermetic gate tests via fixture versions.json

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* docs-infra: docs-build workflow — candidate/smoke/promote two-stage deploy + registry + rollback

Two-stage CF Workers pipeline: build in pinned container, assemble artifact,
sanity gates, deploy candidate, scoped pre-traffic smoke via canary apex,
promote (rollback-id capture, hostname purge, registry upload), post-promote
probe + auto-rollback. DOCS_CF_LIVE repo variable gates every docs.vyos.io
production interaction pre-cutover.

scripts/docs_gates/smoke.py adds one authorized check beyond the spec: the
version's index.html probe asserts the #vyos-search mount div is present in
the response body, guarding CI silently forgetting DOCS_VERSION_SLUG (which
would otherwise ship stock RTD search without the Pagefind gate noticing).

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* docs-infra: build docs image in-workflow with buildx cache (v4.1 — digest pin dropped)

Plan v4.1 amendment: the ghcr.io digest-pinned image does not exist (workflow
would hard-fail at the first docker step on every push). Replace the BUILD_IMAGE
env placeholder with an in-workflow docker build from docker/Dockerfile via
docker/setup-buildx-action@v3 + docker/build-push-action@v6 (context: docker/,
load: true, tags: docs-build:local, GHA cache from/to). The checked-out commit
is the pin; buildx GHA cache keeps repeat builds cheap. Sphinx-build step swaps
to docs-build:local; inner script unchanged.

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* docs-infra: apex/preview deploy workflow — canary auto, production behind environment approval

* docs-infra: apex-deploy concurrency guard (per-ref, cancel-in-progress)

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* docs-infra: fork-safe PR preview pipeline — approval record, R2 prefixes, label consumption, cleanup

* docs-infra: nightly preview sweep — pipefail + per-prefix failure isolation

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* docs-infra: nightly canary QA — per-entry sweep + URL-parity corpus vs RTD

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* docs-infra: parity sweep scoped to CF-built versions; transport-error resilience

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* docs-infra: one-off bootstrap workflow (binding targets — runs once on this push)

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* docs-infra: remove one-off bootstrap workflow (bootstrap complete)

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* docs-infra: one-off canary apex + preview deploy (route targets for Task 3.6 step 2c)

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* docs-infra: remove one-off canary deploy workflow (targets live)

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* docs-infra: address Phase-0 CodeRabbit findings (canonical gate, error caching, registry pointer, validation)

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* docs-infra: strengthen manifest tests (full dispatch iteration, mutation-free validate)

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* docs-infra: address GitHub CodeRabbit review (pointer-after-probe, fail-closed sweeps, block-precedence UA gate, preview hardening)

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* docs-infra: adversarial review fixes — error no-store, probe retry, PR-list membership, preview dotted-segment

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* docs-infra: serve oversized legacy PDF from R2 via apex (spec §5 fallback)

The 1.3 PDF (29.2 MiB) exceeds the 25 MiB static-asset cap and is absent
from the legacy content Worker's build, so /_/downloads/en/1.3/pdf/ (and
the picker's PDF link) 301'd into a dead-end 404 post-cutover. Add the R2
object fallback spec §5 already documented but never implemented: a
DOCS_PDFS R2 bucket binding on the apex Worker, a manifest pdf_r2_key
field (1.3 only), and a router step ahead of version dispatch that streams
the object with its own cache class (canary/error still force no-store).

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* docs-infra: PDF R2 fallback honors Range + If-None-Match, preserves ETag

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2 files changed, 106 insertions, 0 deletions

diff --git a/workers/picker-test/pagefind-wrapper.test.ts b/workers/picker-test/pagefind-wrapper.test.ts
new file mode 100644
index 00000000..75e8be50
--- /dev/null
+++ b/workers/picker-test/pagefind-wrapper.test.ts
@@ -0,0 +1,42 @@
+import { describe, it, expect } from "vitest";
+// The workers pool has no real filesystem (node:fs readFileSync is an unimplemented
+// stub — see @cloudflare/vitest-pool-workers/dist/worker/lib/node/fs.mjs, and confirmed
+// empirically here: "readFileSync() is not yet implemented in Workers"). Same constraint
+// documented in picker.test.ts and apex/test/manifest.test.ts; import as Vite `?raw` asset
+// instead so content is inlined at bundle time — no runtime filesystem access needed.
+// eslint-disable-next-line import/no-unresolved
+import src from "../../docs/_static/js/pagefind-wrapper.js?raw";
+
+const ns: Record<string, unknown> = {};
+new Function("window", src)(ns as never);
+const W = (ns as never as { VyOSSearch: Record<string, CallableFunction> }).VyOSSearch;
+
+describe("basePathFor (§9)", () => {
+  it("production/canary version path", () => {
+    expect(W.basePathFor("/en/rolling/search.html"))
+      .toEqual({ base: "/en/rolling/", prefix: "" });
+  });
+  it("PR preview path keeps /pr-<n>/ prefix and reports it", () => {
+    expect(W.basePathFor("/pr-42/en/1.5/search.html"))
+      .toEqual({ base: "/pr-42/en/1.5/", prefix: "/pr-42" });
+  });
+  it("prefixes result URLs in previews", () => {
+    expect(W.prefixResultUrl("/en/1.5/cli/index.html", "/pr-42")).toBe("/pr-42/en/1.5/cli/index.html");
+    expect(W.prefixResultUrl("/en/1.5/cli/index.html", "")).toBe("/en/1.5/cli/index.html");
+  });
+});
+
+describe("assetUrlsFor (css + js pair under the version base)", () => {
+  it("production/canary base", () => {
+    expect(W.assetUrlsFor("/en/rolling/")).toEqual({
+      css: "/en/rolling/pagefind/pagefind-ui.css",
+      js: "/en/rolling/pagefind/pagefind-ui.js",
+    });
+  });
+  it("PR preview base keeps the /pr-<n>/ prefix", () => {
+    expect(W.assetUrlsFor("/pr-42/en/1.5/")).toEqual({
+      css: "/pr-42/en/1.5/pagefind/pagefind-ui.css",
+      js: "/pr-42/en/1.5/pagefind/pagefind-ui.js",
+    });
+  });
+});
diff --git a/workers/picker-test/picker.test.ts b/workers/picker-test/picker.test.ts
new file mode 100644
index 00000000..33ae2264
--- /dev/null
+++ b/workers/picker-test/picker.test.ts
@@ -0,0 +1,64 @@
+import { describe, it, expect } from "vitest";
+// The workers pool has no real filesystem (node:fs readFileSync is an unimplemented
+// stub — see @cloudflare/vitest-pool-workers/dist/worker/lib/node/fs.mjs, and confirmed
+// empirically here: "readFileSync() is not yet implemented in Workers"). Same constraint
+// documented in apex/test/manifest.test.ts; import as Vite `?raw` / native JSON assets
+// instead so content is inlined at bundle time — no runtime filesystem access needed.
+// eslint-disable-next-line import/no-unresolved
+import src from "../../docs/_static/js/version-picker.js?raw";
+// eslint-disable-next-line import/no-unresolved
+import manifest from "../versions.json";
+
+// Evaluate the plain script and grab its namespace (no DOM access at module scope allowed).
+const ns: Record<string, CallableFunction> = {};
+new Function("window", src)(ns as never);
+const P = (ns as never as { VyOSVersionPicker: Record<string, CallableFunction> }).VyOSVersionPicker;
+
+describe("parseLocation", () => {
+  it("extracts lang/slug/rest from a docs path", () => {
+    expect(P.parseLocation("/en/1.5/cli/index.html"))
+      .toEqual({ lang: "en", slug: "1.5", rest: "cli/index.html" });
+  });
+  it("returns null off the version tree (e.g. previews without prefix knowledge)", () => {
+    expect(P.parseLocation("/kb/x")).toBeNull();
+  });
+});
+
+describe("bannerFor (§4)", () => {
+  it("dev → info banner", () => {
+    expect(P.bannerFor("rolling", manifest)).toMatchObject({ kind: "dev" });
+  });
+  it("newest lts → no banner; older lts → newer-lts notice naming 1.5", () => {
+    expect(P.bannerFor("1.5", manifest)).toBeNull();
+    expect(P.bannerFor("1.4", manifest)).toMatchObject({ kind: "newer-lts", newest: "1.5" });
+  });
+  it("eol → warning linking newest LTS", () => {
+    expect(P.bannerFor("1.3", manifest)).toMatchObject({ kind: "eol", newest: "1.5" });
+  });
+});
+
+describe("targetUrlFor", () => {
+  it("same path on target version", () => {
+    expect(P.targetUrlFor({ lang: "en", slug: "1.5", rest: "cli/index.html" }, "1.4"))
+      .toBe("/en/1.4/cli/index.html");
+  });
+});
+
+describe("navUrlFor (query + fragment preserved across version switch)", () => {
+  const loc = { lang: "en", slug: "1.4", rest: "quick-start.html" };
+  it("neither → bare target path", () => {
+    expect(P.navUrlFor(loc, "1.5", "", "")).toBe("/en/1.5/quick-start.html");
+  });
+  it("query-only", () => {
+    expect(P.navUrlFor(loc, "1.5", "?ref=x", ""))
+      .toBe("/en/1.5/quick-start.html?ref=x");
+  });
+  it("hash-only", () => {
+    expect(P.navUrlFor(loc, "1.5", "", "#section-3"))
+      .toBe("/en/1.5/quick-start.html#section-3");
+  });
+  it("both, in query-then-hash order", () => {
+    expect(P.navUrlFor(loc, "1.5", "?ref=x", "#section-3"))
+      .toBe("/en/1.5/quick-start.html?ref=x#section-3");
+  });
+});