fix(site-publish): retain immutable history across deploys

Authored-By: @architect <architect@fritzlab.net>

.gitea/workflows/test.yaml

@@ -0,0 +1,14 @@
+name: Test
+on:
+  pull_request:
+  push:
+    branches: [main]
+jobs:
+  contract:
+    runs-on: fritzlab
+    steps:
+      - uses: actions/checkout@v4
+      - name: Install test dependencies
+        run: python3 -m pip install --quiet --break-system-packages jinja2 pyyaml
+      - name: Run contract tests
+        run: python3 -m unittest discover -s tests -v

README.md

@@ -1,9 +1,11 @@
 # action/site-publish
 
-Composite Gitea Action that publishes a **static-content** website to the
+Composite Gitea Action that publishes one or more **static-content** artifacts
-fritzlab k8s cluster. Supports `static`, `hugo`, and `mkdocs`. Content goes
+to one hostname. Each split surface owns its build input, Garage bucket,
-to a Garage S3 bucket; Traefik fronts the bucket via an `ExternalName`
+publication credential environment variables, cache rules, Service, Ingress,
-Service with cert-manager TLS.
+route prefix, and access middleware. The hostname shares one Certificate.
+`static`, `hugo`, and `mkdocs` builds are supported; a prebuilt Docusaurus
+output is a `static` artifact.
 
 > **Containerized web apps (Dockerfile-based) are NOT handled here.** Use the
 > standard image-producer chain instead:
@@ -16,9 +18,10 @@ Service with cert-manager TLS.
 > for the canonical example. site-publish errors out explicitly if
 > `site.yaml` has `type: docker`.
 
-## Convention
+## Single-surface compatibility
 
-Bucket name = repo name = canonical domain. Sibling hostnames (e.g. `www.`,
+Existing `site.yaml` files remain the `single-surface-v1` compatibility
+contract. Bucket name = repo name = canonical domain. Sibling hostnames (e.g. `www.`,
 `ipv6.`) are declared as `aliases:` in `site.yaml` — the action registers each
 as a Garage `globalAlias` on the bucket and adds it to the Ingress + Certificate
 on every deploy. Manual edits to manifests in the apps repo are clobbered;
@@ -32,6 +35,133 @@ Scaffold a new site (handles repo creation + Garage bucket):
 ./new-site.sh --name my-site.vino.network --domain my-site.vino.network --type static
 ```
 
+The compatibility path still writes `build/html`, uploads with
+`AWS_ACCESS_KEY_ID`/`AWS_SECRET_ACCESS_KEY`, and renders `service.yaml` plus
+`ingress.yaml`. Its only behavior change is the required root-cause repair:
+the website Service now targets the data-only `garage-s3` Service.
+
+## Split-surface contract
+
+Use `artifacts` and `routes` together. This example expresses an authenticated
+prebuilt portal at `/` and public bundles at `/dist`; it is illustrative and
+the schema has no Baseline-specific field.
+
+```yaml
+domain: baseline.fritzlab.net
+artifacts:
+  - name: distributions
+    type: static
+    content_dir: dist
+    publish:
+      bucket: baseline-dist
+      credentials:
+        access_key_env: DIST_S3_ACCESS_KEY
+        secret_key_env: DIST_S3_SECRET_KEY
+    cache:
+      rules:
+        - path: /
+          cache_control: public, max-age=0, must-revalidate
+        - path: releases
+          cache_control: public, max-age=31536000, immutable
+        - path: channels
+          cache_control: public, max-age=0, must-revalidate
+  - name: portal
+    type: static
+    content_dir: portal/build
+    publish:
+      bucket: baseline-portal
+      credentials:
+        access_key_env: PORTAL_S3_ACCESS_KEY
+        secret_key_env: PORTAL_S3_SECRET_KEY
+    cache:
+      rules:
+        - path: /
+          cache_control: private, no-store
+routes:
+  - name: distributions
+    path: /dist
+    artifact: distributions
+    access:
+      mode: public
+  - name: portal
+    path: /
+    artifact: portal
+    access:
+      mode: protected
+      middleware: authentik-forwardauth
+```
+
+The caller supplies each declared credential name as an environment variable
+on the action step. Names must be matched `<NAME>_S3_ACCESS_KEY` and
+`<NAME>_S3_SECRET_KEY` pairs; arbitrary environment variables cannot become
+publication credentials. Values pass to `aws` only through its environment and
+never appear in a logged command or process argument.
+
+```yaml
+      - uses: https://code.fritzlab.net/action/site-publish@v1
+        with:
+          token: ${{ secrets.CI_BOT_TOKEN }}
+        env:
+          DIST_S3_ACCESS_KEY: ${{ secrets.DIST_S3_ACCESS_KEY }}
+          DIST_S3_SECRET_KEY: ${{ secrets.DIST_S3_SECRET_KEY }}
+          PORTAL_S3_ACCESS_KEY: ${{ secrets.PORTAL_S3_ACCESS_KEY }}
+          PORTAL_S3_SECRET_KEY: ${{ secrets.PORTAL_S3_SECRET_KEY }}
+```
+
+Routes are normalized and rendered longest-prefix first. Split mode requires
+one `/` catch-all so unmatched paths have an explicit access policy. If any
+route is protected, that catch-all must also be protected. Every artifact must
+belong to exactly one route and bucket; protected and public routes cannot
+reuse a bucket. A protected route requires an existing file-provider access
+middleware. Public routes cannot declare one.
+
+Every cache policy requires a `/` default. More-specific cache paths override
+it, are reapplied in deterministic prefix order, and must exist in the built
+artifact. Contradictory directives (`public` plus `private`, `immutable` plus
+revalidation, or `no-store` plus a positive max-age) are rejected. Protected
+artifacts require `private` or `no-store` and cannot emit `public`.
+Metadata restamping transfers each artifact once even on a no-op publication;
+that is the cost of making policy changes effective on unchanged Garage objects.
+An immutable cache path is excluded from sync and deletion. Every object key in
+that path must contain exactly one full publication SHA-256, calculated over its
+cache policy, content type, and bytes. That content address makes concurrent
+writes identical even though Garage v2.2.0 has no conditional destination
+write. An identical retry converges; a changed object, missing digest metadata,
+wrong address, or nested policy under that immutable prefix fails publication.
+Every immutable target across every artifact is validated and published before
+any route's mutable objects change.
+Mutable default and override partitions receive their final cache policy before
+the matching prefix-scoped stale deletion, so publication never exposes a
+provisional cache policy or a pointer to a missing immutable target.
+An append-only `site-publish-history.json` beside each generated site retains every bucket's access
+class and absolute immutable prefixes, including removed routes and rules. When a route move places
+a retired prefix inside the new sync scope, that subtree is excluded; a current-file collision
+fails publication. Protected access remains sticky across artifact renames and legacy mode, so
+publishing the same artifact publicly requires a new bucket. Decommissioning removes the live
+application and manifests while retaining this history because its Garage bucket is not purged.
+
+Artifact input directories must be pairwise disjoint after filesystem
+resolution. Publication stops before build or upload if one contains another or
+escapes the repository. Symlinked roots, components, and descendants are also rejected, preventing
+protected input from entering a public artifact through dereference. Split
+storage endpoints are pinned to Garage, and each website
+authority is derived from its bucket; a site cannot expose an arbitrary backend.
+
+Each split route gets a bucket-specific `<bucket>.web.sjc001.fritzlab.net`
+ExternalName Service annotated to disable pass-host-header and a separate Ingress. Route
+Ingresses share the hostname's certificate Secret. The access middleware and
+Garage bucket/key must already exist; the publisher doesn't create identity
+providers or credentials.
+
+### Migrating a site
+
+Leave an existing single-surface file unchanged until a real second surface
+exists. Then build every artifact before this action, move the old fields into
+an artifact, declare a route for every artifact, give each bucket a separately
+scoped key, and set the route access/cache contract. Run the repository tests
+and inspect generated Apps changes. Removing a route removes its generated
+Service and Ingress on the next render; bucket deletion remains manual.
+
 Or do it manually. `site.yaml`:
 
 ```yaml
@@ -75,11 +205,11 @@ jobs:
           garage-admin-token: ${{ secrets.GARAGE_ADMIN_TOKEN }}
 ```
 
-DNS: subdomains of `vino.network` are covered by the wildcard CNAME to
+DNS: subdomains of `vino.network` are covered by the wildcard CNAME to the
-`traefik.edge.svc…`. For other zones, add an explicit CNAME:
+public gateway. For other zones, add an explicit CNAME:
 
 ```
-my-site.fritzlab.net  300  IN  CNAME  traefik.edge.svc.k8s.sjc001.fritzlab.net.
+my-site.fritzlab.net  300  IN  CNAME  gateway.sjc001.fritzlab.net.
 ```
 
 ## Inputs
@@ -87,10 +217,10 @@ my-site.fritzlab.net  300  IN  CNAME  traefik.edge.svc.k8s.sjc001.fritzlab.net.
 | Input | Required | Default | Description |
 |---|---|---|---|
 | `token` | yes | | Gitea token for apps repo push |
-| `s3-access-key` | yes | | Garage `ci-deploy-key` access key id |
+| `s3-access-key` | legacy only | | Garage access key id for single-surface sites |
-| `s3-secret-key` | yes | | Garage `ci-deploy-key` secret key |
+| `s3-secret-key` | legacy only | | Garage secret key for single-surface sites |
-| `s3-endpoint` | no | `http://garage.storage.svc:3900` | Garage S3 endpoint |
+| `s3-endpoint` | no | `http://garage-s3.storage.svc:3900` | Legacy Garage S3 endpoint |
-| `garage-admin-token` | only if site has `aliases` | | Garage admin API token (`admin-token` from `garage-rpc-secret` in `storage` ns) |
+| `garage-admin-token` | legacy aliases only | | Garage admin API token (`admin-token` from `garage-rpc-secret` in `storage` ns) |
 | `garage-admin-endpoint` | no | `http://garage.storage.svc:3903` | Garage admin API endpoint |
 | `username` | no | `ci-bot` | Gitea username |
 
@@ -107,12 +237,11 @@ Org secrets in `websites`: `CI_BOT_TOKEN`, `GARAGE_S3_ACCESS_KEY`,
 ```
 push to websites/<repo>
   → CI runs site-publish action
-  → reads site.yaml, builds content (static copy / hugo / mkdocs), runs tidy
+  → reads and validates all of site.yaml before publication
-  → aws s3 sync → Garage bucket named after the repo
+  → independently builds each static / Hugo / MkDocs artifact
-  → admin API: ensures every alias from site.yaml is a globalAlias on the bucket
+  → syncs each artifact to its route-owned Garage bucket and prefix
-  → renders manifests in fritzlab/apps from templates: ExternalName Service →
+  → reapplies the artifact's default and longest-prefix cache headers
-    garage.storage.svc, Traefik Ingress (canonical + aliases), cert-manager
+  → renders one Service + Ingress per route and one shared Certificate
-    Certificate (canonical + aliases as SANs), kustomization
   → commits + pushes apps repo only if diff is non-empty
   → ArgoCD syncs → site live with TLS
 ```
@@ -120,9 +249,10 @@ push to websites/<repo>
 The Ingress + Certificate are re-rendered on every deploy from `site.yaml`.
 There is no "first-deploy vs. update" branching — every deploy is idempotent.
 
-No nginx pods, no per-site Docker images. Garage matches `Host:` header to
+No nginx pods, no per-site Docker images. Compatibility sites pass the public
-bucket name (or any of its globalAliases), so every site shares a single
+host to the shared data-only Garage website Service. Split routes disable host
-ExternalName target.
+passing on their Service so Garage receives that artifact's bucket-specific
+website authority.
 
 ## History
 

action.yaml

@@ -1,15 +1,15 @@
 name: Publish Site
-description: Build and deploy a static-content site (static, hugo, mkdocs) to Garage S3 with Traefik + cert-manager. Containerized apps should use action/image-build + action/image-push + action/image-deploy.
+description: Build and deploy one or more routed static-content artifacts to Garage S3 with Traefik and cert-manager.
 inputs:
   token:
     description: Gitea token (ci-bot) for apps repo push and API operations
     required: true
   s3-access-key:
-    description: Garage ci-deploy-key access key id
+    description: Garage access key id (required by the legacy single-surface contract)
-    required: true
+    required: false
   s3-secret-key:
-    description: Garage ci-deploy-key secret access key
+    description: Garage secret access key (required by the legacy single-surface contract)
-    required: true
+    required: false
   s3-endpoint:
     # Targets garage-s3 (data-only Service) so requests do not round-robin onto
     # the gateway pod, whose emptyDir-backed metadata view intermittently
@@ -18,7 +18,7 @@ inputs:
     required: false
     default: http://garage-s3.storage.svc:3900
   garage-admin-token:
-    description: Garage admin API token (required only when site.yaml has aliases — used to reconcile bucket globalAliases)
+    description: Garage admin API token (required only for legacy aliases — used to reconcile bucket globalAliases)
     required: false
   garage-admin-endpoint:
     description: Garage admin API endpoint URL

new-site.sh

@@ -165,6 +165,6 @@ echo
 echo "Site created: ${ORG}/${NAME}"
 echo "First build will trigger on push."
 echo
-echo "DNS: ${DOMAIN} is covered by the *.vino.network wildcard (→ traefik.edge)."
+echo "DNS: ${DOMAIN} is covered by the *.vino.network wildcard (→ public gateway)."
 echo "For a domain outside vino.network, add an explicit CNAME:"
-echo "  ${DOMAIN}    300    IN    CNAME    traefik.edge.svc.k8s.sjc001.fritzlab.net."
+echo "  ${DOMAIN}    300    IN    CNAME    gateway.sjc001.fritzlab.net."

scripts/build.py

@@ -1,25 +1,25 @@
-"""Build phase — content prep for static-content sites."""
+"""Build each declared static-content artifact independently."""
 
 import shutil
 import subprocess
 import tempfile
 from pathlib import Path
 
-from utils import EXCLUDE_FILES, env, parse_site_yaml, run
+from utils import EXCLUDE_FILES, env, parse_site_yaml, run, validate_artifact_inputs
 
 
-def build_static(site_dir, cfg):
+def build_artifact(site_dir, artifact):
-    build_dir = site_dir / "build"
+    html_dir = site_dir / artifact["build_dir"]
-    html_dir = build_dir / "html"
+    if html_dir.parent.exists():
+        shutil.rmtree(html_dir.parent)
 
-    if build_dir.exists():
+    content_dir = artifact["content_dir"]
-        shutil.rmtree(build_dir)
-
-    content_dir = cfg["content_dir"]
     src = site_dir / content_dir if content_dir else site_dir
+    if not src.exists():
+        raise FileNotFoundError(f"artifact {artifact['name']} content_dir not found: {src}")
 
-    if cfg["type"] == "static":
+    if artifact["type"] == "static":
-        print(f"Copying static content from {src}")
+        print(f"Copying artifact {artifact['name']} from {src}")
         with tempfile.TemporaryDirectory() as tmp:
             tmp_path = Path(tmp) / "html"
             shutil.copytree(src, tmp_path, dirs_exist_ok=True)
@@ -29,18 +29,18 @@ def build_static(site_dir, cfg):
                     shutil.rmtree(p)
                 elif p.exists():
                     p.unlink()
-            build_dir.mkdir(parents=True)
+            html_dir.parent.mkdir(parents=True)
             shutil.move(str(tmp_path), str(html_dir))
 
-    elif cfg["type"] == "hugo":
+    elif artifact["type"] == "hugo":
-        print(f"Building Hugo site from {src}")
+        print(f"Building Hugo artifact {artifact['name']} from {src}")
-        run(f"hugo --source {src} --destination {html_dir}")
+        run(["hugo", "--source", str(src), "--destination", str(html_dir)])
 
-    elif cfg["type"] == "mkdocs":
+    elif artifact["type"] == "mkdocs":
-        print(f"Building MkDocs site from {src}")
+        print(f"Building MkDocs artifact {artifact['name']} from {src}")
-        run(f"cd {src} && mkdocs build -d {html_dir}")
+        run(["mkdocs", "build", "-d", str(html_dir)], cwd=src)
 
-    if cfg.get("tidy", True):
+    if artifact["tidy"]:
         print("Running tidy on HTML files...")
         for html_file in html_dir.rglob("*.html"):
             subprocess.run(
@@ -51,7 +51,9 @@ def build_static(site_dir, cfg):
                 check=False,
             )
 
-    print(f"Build complete — content at {html_dir}")
+    if not any(path.is_file() for path in html_dir.rglob("*")):
+        raise FileNotFoundError(f"artifact {artifact['name']} produced no files in {html_dir}")
+    print(f"Artifact {artifact['name']} complete — content at {html_dir}")
 
 
 def cmd_build():
@@ -62,4 +64,7 @@ def cmd_build():
         print("Site disabled — skipping build")
         return
 
-    build_static(site_dir, cfg)
+    validate_artifact_inputs(site_dir, cfg)
+
+    for artifact in cfg["artifacts"]:
+        build_artifact(site_dir, artifact)

scripts/deploy.py

@@ -1,17 +1,18 @@
 """Deploy phase — S3 sync, manifest rendering, alias reconcile."""
 
+import fnmatch
+import hashlib
 import json
+import mimetypes
 import os
-import shlex
+import re
 import shutil
-import tempfile
+import subprocess
-from pathlib import Path
+from pathlib import Path, PurePosixPath
 from urllib.error import HTTPError, URLError
 from urllib.request import Request, urlopen
 
 from utils import (
-    DEFAULT_S3_ENDPOINT,
-    GITEA_HOST,
     NAMESPACE,
     clone_apps,
     commit_and_push,
@@ -21,51 +22,246 @@ from utils import (
     parse_site_yaml,
     render_templates,
     run,
+    validate_artifact_inputs,
 )
 
 GARAGE_ADMIN_ENDPOINT = os.environ.get(
     "GARAGE_ADMIN_ENDPOINT", "http://garage.storage.svc:3903"
 )
+HISTORY_FILE = "site-publish-history.json"
 
 
-CACHE_CONTROL = "public, max-age=0, must-revalidate"
+def validate_artifact_output(site_dir, artifact):
+    """Prove every artifact and declared cache prefix exists before publishing any."""
+    html_dir = site_dir / artifact["build_dir"]
+    if not html_dir.is_dir() or not any(path.is_file() for path in html_dir.rglob("*")):
+        die(f"artifact {artifact['name']} build output is absent or empty: {html_dir}")
+    for rule in artifact["cache_rules"]:
+        if not rule["path"]:
+            continue
+        cache_root = html_dir / rule["path"]
+        if not cache_root.exists() or not any(path.is_file() for path in cache_root.rglob("*")):
+            die(f"artifact {artifact['name']} cache path /{rule['path']} has no built files")
 
 
-def s3_sync(site_name, site_dir, excludes=None):
+def validate_publication_environment(cfg):
-    endpoint = os.environ.get("GARAGE_S3_ENDPOINT", DEFAULT_S3_ENDPOINT)
+    """Resolve every declared credential before the first bucket is changed."""
-    html_dir = site_dir / "build" / "html"
+    for artifact in cfg["artifacts"]:
-    if not html_dir.exists():
+        env(artifact["credentials"]["access_key_env"])
-        die(f"build/html not found — did the build step run? ({html_dir})")
+        env(artifact["credentials"]["secret_key_env"])
-    env("AWS_ACCESS_KEY_ID")
+    if cfg["compatibility"] and cfg["aliases"] and not os.environ.get("GARAGE_ADMIN_TOKEN"):
-    env("AWS_SECRET_ACCESS_KEY")
+        die("GARAGE_ADMIN_TOKEN is required when aliases are declared")
-    os.environ.setdefault("AWS_DEFAULT_REGION", "sjc001")
+
+
+def _is_immutable(rule):
+    return "immutable" in {
+        part.strip().lower().split("=", 1)[0]
+        for part in rule["cache_control"].split(",")
+    }
+
+
+def _aws_capture(args, aws_env):
+    """Run a non-streaming AWS request without exposing environment credentials."""
+    print(f"  $ {' '.join(str(part) for part in args)}")
+    return subprocess.run(args, env=aws_env, text=True, capture_output=True, check=False)
+
+
+def _immutable_head(endpoint, bucket, key, aws_env):
+    args = ["aws", "--endpoint-url", endpoint, "s3api", "head-object",
+            "--bucket", bucket, "--key", key, "--output", "json"]
+    result = _aws_capture(args, aws_env)
+    if result.returncode == 0:
+        return json.loads(result.stdout)
+    error = f"{result.stdout}\n{result.stderr}"
+    if any(marker in error for marker in ("404", "Not Found", "NoSuchKey")):
+        return None
+    raise RuntimeError(f"head-object failed for s3://{bucket}/{key}: {error.strip()}")
+
+
+def _immutable_digests(source, cache_control, content_type):
+    with source.open("rb") as stream:
+        content_digest = hashlib.file_digest(stream, "sha256").hexdigest()
+    publication = hashlib.sha256()
+    publication.update(cache_control.encode())
+    publication.update(b"\0")
+    publication.update(content_type.encode())
+    publication.update(b"\0")
+    with source.open("rb") as stream:
+        for block in iter(lambda: stream.read(1024 * 1024), b""):
+            publication.update(block)
+    return content_digest, publication.hexdigest()
+
+
+def _same_immutable_object(info, content_digest, publication_digest, cache_control, content_type):
+    metadata = {key.lower(): value for key, value in (info.get("Metadata") or {}).items()}
+    return (
+        metadata.get("sha256") == content_digest
+        and metadata.get("publication-sha256") == publication_digest
+        and info.get("CacheControl") == cache_control
+        and info.get("ContentType") == content_type
+    )
+
+
+def publish_immutable_file(endpoint, bucket, key, source, cache_control, aws_env):
+    """Publish a content-addressed key; identical retries converge."""
+    content_type = mimetypes.guess_type(source.name)[0] or "application/octet-stream"
+    content_digest, publication_digest = _immutable_digests(source, cache_control, content_type)
+    address_digests = re.findall(r"(?<![0-9a-f])([0-9a-f]{64})(?![0-9a-f])", key.lower())
+    if address_digests != [publication_digest]:
+        raise RuntimeError(
+            f"immutable key must contain its one publication SHA-256 {publication_digest}: "
+            f"s3://{bucket}/{key}"
+        )
+    existing = _immutable_head(endpoint, bucket, key, aws_env)
+    if existing is not None:
+        if _same_immutable_object(
+            existing, content_digest, publication_digest, cache_control, content_type,
+        ):
+            print(f"  Immutable object already matches: s3://{bucket}/{key}")
+            return False
+        raise RuntimeError(f"immutable object differs or lacks publisher digest: s3://{bucket}/{key}")
+    args = ["aws", "--endpoint-url", endpoint, "s3api", "put-object",
+            "--bucket", bucket, "--key", key, "--body", str(source),
+            "--content-type", content_type, "--cache-control", cache_control,
+            "--metadata", f"sha256={content_digest},publication-sha256={publication_digest}"]
+    result = _aws_capture(args, aws_env)
+    if result.returncode == 0:
+        return True
+    error = f"{result.stdout}\n{result.stderr}"
+    raise RuntimeError(f"put-object failed for s3://{bucket}/{key}: {error.strip()}")
+
+
+def publish_immutable_rule(artifact, route, rule, html_dir, aws_env):
+    """Publish one immutable cache partition without overwrite or deletion."""
+    rule_root = html_dir / rule["path"]
+    child_paths = [candidate["path"] for candidate in artifact["cache_rules"]
+                   if candidate["path"].startswith(f"{rule['path'].rstrip('/')}/")]
+    object_prefix = route["path"].strip("/")
+    for source in sorted(path for path in rule_root.rglob("*") if path.is_file()):
+        relative = source.relative_to(html_dir).as_posix()
+        if any(relative == child or relative.startswith(f"{child}/") for child in child_paths):
+            continue
+        if any(fnmatch.fnmatch(relative, pattern) for pattern in artifact["excludes"]):
+            continue
+        key = "/".join(part for part in (object_prefix, relative) if part)
+        publish_immutable_file(
+            artifact["s3_endpoint"], artifact["bucket"], key, source,
+            rule["cache_control"], aws_env,
+        )
+
+
+def publication_aws_env(artifact, credential_env_names=None):
+    """Build the route-scoped AWS environment without leaking other credentials."""
+    access_key = env(artifact["credentials"]["access_key_env"])
+    secret_key = env(artifact["credentials"]["secret_key_env"])
+    aws_env = os.environ.copy()
+    for name in credential_env_names or artifact["credentials"].values():
+        aws_env.pop(name, None)
+    for name in ("CI_BOT_TOKEN", "GARAGE_ADMIN_TOKEN", "AWS_PROFILE",
+                 "AWS_SHARED_CREDENTIALS_FILE", "AWS_SESSION_TOKEN"):
+        aws_env.pop(name, None)
+    aws_env.update({
+        "AWS_ACCESS_KEY_ID": access_key,
+        "AWS_SECRET_ACCESS_KEY": secret_key,
+        "AWS_DEFAULT_REGION": os.environ.get("AWS_DEFAULT_REGION", "sjc001"),
+    })
+    return aws_env
+
+
+def publish_route_immutables(artifact, route, site_dir, credential_env_names=None):
+    """Publish one route's immutable partitions during the global preflight."""
+    html_dir = site_dir / artifact["build_dir"]
+    aws_env = publication_aws_env(artifact, credential_env_names)
+    for rule in artifact["cache_rules"]:
+        if _is_immutable(rule):
+            publish_immutable_rule(artifact, route, rule, html_dir, aws_env)
+
+
+def retired_immutable_filters(artifact, route, html_dir, previous_contract):
+    """Protect every historical immutable prefix inside the current sync scope."""
+    if not previous_contract:
+        return []
+    current_prefix = route["path"].strip("/")
+    filters = []
+    current_immutable = set(immutable_prefixes(artifact, route))
+    for immutable_prefix in previous_contract["immutable_prefixes"]:
+        if current_prefix:
+            marker = f"{current_prefix}/"
+            if not immutable_prefix.startswith(marker):
+                continue
+            relative_path = immutable_prefix[len(marker):]
+        else:
+            relative_path = immutable_prefix
+        collision = html_dir / relative_path
+        if (immutable_prefix not in current_immutable and collision.exists()
+                and any(path.is_file() for path in collision.rglob("*"))):
+            raise RuntimeError(
+                f"current artifact collides with retired immutable partition: {relative_path}"
+            )
+        filters.extend(("--exclude", f"{relative_path}/*"))
+    return filters
+
+
+def immutable_prefixes(artifact, route):
+    route_prefix = route["path"].strip("/")
+    return sorted({
+        "/".join(part for part in (route_prefix, rule["path"]) if part)
+        for rule in artifact["cache_rules"] if _is_immutable(rule)
+    })
+
+
+def s3_sync(artifact, route, site_dir, credential_env_names=None, previous_contract=None):
+    endpoint = artifact["s3_endpoint"]
+    html_dir = site_dir / artifact["build_dir"]
+    aws_env = publication_aws_env(artifact, credential_env_names)
+    bucket = artifact["bucket"]
+    object_prefix = route["path"].strip("/")
+    destination = f"s3://{bucket}/{object_prefix + '/' if object_prefix else ''}"
+    default_cache = next(rule["cache_control"] for rule in artifact["cache_rules"] if not rule["path"])
+    immutable_paths = [rule["path"] for rule in artifact["cache_rules"] if _is_immutable(rule)]
     # `excludes` are patterns (site.yaml `excludes:` list) that should never
     # be uploaded *and* should never be deleted from the bucket — escape hatch
     # for assets managed out-of-band (e.g. large PDFs uploaded via aws-cli).
-    exclude_flags = " ".join(f"--exclude {shlex.quote(p)}" for p in (excludes or []))
+    exclude_args = [arg for pattern in artifact["excludes"] for arg in ("--exclude", pattern)]
-    if excludes:
+    if artifact["excludes"]:
-        print(f"Excluding patterns: {excludes}")
+        print(f"Excluding patterns: {artifact['excludes']}")
-    print(f"Syncing {html_dir} → s3://{site_name} via {endpoint}")
+    print(f"Syncing artifact {artifact['name']} → {destination} via {endpoint}")
-    # `sync --delete` handles new/changed/orphaned files. `cp --recursive`
+    # Upload with the final cache policy before cleanup. Sync and deletion are
-    # then re-uploads everything to refresh metadata (cache-control,
+    # scoped to the same current route prefix and cache partition. A route move
-    # content-type) on objects sync skipped because nothing changed.
+    # leaves its old bucket partition intact but unreachable after the old
-    # Cost: a no-op deploy still re-uploads every byte. Sites here are
+    # Ingress disappears, while stale mutable keys on the serving prefix are
-    # small enough that that's free; correctness wins over throughput.
+    # deleted. Immutable subtrees are structurally excluded. `cp --recursive`
+    # refreshes metadata atomically per object before `sync --delete` removes
+    # stale keys without ever exposing new bytes under a provisional policy.
+    # A no-op deploy therefore transfers the artifact bytes once.
     # AWS CLI guesses Content-Type from file extension on local→S3 uploads,
     # so a fresh upload always carries the right MIME type.
-    run(
+    specific_paths = [rule["path"] for rule in artifact["cache_rules"] if rule["path"]]
-        f"aws --endpoint-url {endpoint} s3 sync {html_dir}/ s3://{site_name}/ "
+    default_filters = [arg for path in specific_paths for arg in ("--exclude", f"{path}/*")]
-        f"--delete --only-show-errors "
+    retired_filters = retired_immutable_filters(artifact, route, html_dir, previous_contract)
-        f"--cache-control '{CACHE_CONTROL}' "
+    run(["aws", "--endpoint-url", endpoint, "s3", "cp", f"{html_dir}/", destination,
-        f"{exclude_flags}".rstrip()
+         "--recursive", "--only-show-errors", "--cache-control", default_cache,
-    )
+         *default_filters, *retired_filters, *exclude_args], env=aws_env)
-    print("Re-stamping metadata on all objects...")
+    run(["aws", "--endpoint-url", endpoint, "s3", "sync", f"{html_dir}/", destination,
-    run(
+         "--delete", "--only-show-errors", "--cache-control", default_cache,
-        f"aws --endpoint-url {endpoint} s3 cp {html_dir}/ s3://{site_name}/ "
+         *default_filters, *retired_filters, *exclude_args], env=aws_env)
-        f"--recursive --only-show-errors "
+    for rule in artifact["cache_rules"]:
-        f"--cache-control '{CACHE_CONTROL}' "
+        if not rule["path"]:
-        f"{exclude_flags}".rstrip()
+            continue
-    )
+        if _is_immutable(rule):
+            continue
+        include = f"{rule['path'].rstrip('/')}/*"
+        child_filters = [arg for path in specific_paths
+                         if path.startswith(f"{rule['path'].rstrip('/')}/")
+                         for arg in ("--exclude", f"{path}/*")]
+        # Apply rules from the artifact root so artifact-level exclusions keep
+        # their original meaning under every cache override.
+        run(["aws", "--endpoint-url", endpoint, "s3", "cp", f"{html_dir}/", destination,
+             "--recursive", "--only-show-errors", "--cache-control", rule["cache_control"],
+             "--exclude", "*", "--include", include, *child_filters, *exclude_args], env=aws_env)
+        run(["aws", "--endpoint-url", endpoint, "s3", "sync", f"{html_dir}/", destination,
+             "--delete", "--only-show-errors", "--cache-control", rule["cache_control"],
+             "--exclude", "*", "--include", include, *child_filters, *exclude_args], env=aws_env)
 
 
 def garage_admin(method, path, token, body=None):
@@ -89,15 +285,13 @@ def ensure_bucket_aliases(site_name, aliases, admin_token):
     if not aliases:
         return
     if not admin_token:
-        print("  (no GARAGE_ADMIN_TOKEN — skipping bucket alias reconcile)")
+        die("GARAGE_ADMIN_TOKEN is required when aliases are declared")
-        return
 
     try:
         info = garage_admin("GET", f"/v2/GetBucketInfo?globalAlias={site_name}",
                             admin_token)
     except (HTTPError, URLError) as e:
-        print(f"  WARNING: bucket lookup failed: {e}")
+        raise RuntimeError(f"bucket lookup failed for {site_name}: {e}") from e
-        return
 
     bucket_id = info.get("id")
     existing = set(info.get("globalAliases") or [])
@@ -120,46 +314,168 @@ def render_site_manifests(site_name, action_dir, app_dir, manifests_dir, cfg):
     """Always re-render manifests from current site.yaml. Templates own
     domain + aliases, so changes propagate without manual edits."""
     manifests_dir.mkdir(parents=True, exist_ok=True)
+    artifact_by_name = {artifact["name"]: artifact for artifact in cfg["artifacts"]}
+    routes = []
+    for route in cfg["routes"]:
+        artifact = artifact_by_name[route["artifact"]]
+        resource_name = k8s_name(site_name) if cfg["compatibility"] else f"{k8s_name(site_name)}-{route['name']}"
+        routes.append({**route, "resource_name": resource_name, "artifact_config": artifact})
     template_vars = {
         "site": site_name,
         "site_k8s": k8s_name(site_name),
         "domain": cfg["domain"],
         "aliases": cfg["aliases"],
         "namespace": NAMESPACE,
-        "middlewares": cfg["middlewares"],
+        "compatibility": cfg["compatibility"],
+        "routes": routes,
     }
     render_templates(action_dir, template_vars, app_dir, manifests_dir)
 
 
-def deploy_static(site_name, site_dir, action_dir, token, cfg):
+def previous_route_contracts(app_dir):
-    s3_sync(site_name, site_dir, excludes=cfg.get("excludes"))
+    """Read the append-only bucket history kept beside generated manifests."""
-    ensure_bucket_aliases(site_name, cfg["aliases"], os.environ.get("GARAGE_ADMIN_TOKEN"))
+    path = app_dir / HISTORY_FILE
+    if not path.exists():
+        return {}
+    try:
+        document = json.loads(path.read_text())
+    except (OSError, json.JSONDecodeError) as exc:
+        raise RuntimeError(f"invalid site-publish route history in {path}") from exc
+    if (not isinstance(document, dict) or set(document) != {"schemaVersion", "buckets"}
+            or document["schemaVersion"] != 1 or not isinstance(document["buckets"], dict)):
+        raise RuntimeError(f"invalid site-publish route history in {path}")
+    for bucket, contract in document["buckets"].items():
+        if (not isinstance(bucket, str) or not isinstance(contract, dict)
+                or set(contract) != {"access", "artifact", "immutablePrefixes", "routePath"}
+                or contract["access"] not in {"legacy", "protected", "public"}
+                or not isinstance(contract["artifact"], str)
+                or not isinstance(contract["routePath"], str)
+                or not contract["routePath"].startswith("/")
+                or not isinstance(contract["immutablePrefixes"], list)
+                or any(not _valid_immutable_prefix(value)
+                       for value in contract["immutablePrefixes"])
+                or len(contract["immutablePrefixes"]) != len(set(contract["immutablePrefixes"]))):
+            raise RuntimeError(f"invalid site-publish route history in {path}")
+    return {
+        bucket: {
+            "access": contract["access"],
+            "artifact": contract["artifact"],
+            "immutable_prefixes": sorted(contract["immutablePrefixes"]),
+            "path": contract["routePath"],
+        }
+        for bucket, contract in document["buckets"].items()
+    }
 
+
+def next_route_contracts(cfg, previous_contracts):
+    """Carry protected access and immutable prefixes forward for every known bucket."""
+    contracts = json.loads(json.dumps(previous_contracts))
+    artifacts = {artifact["name"]: artifact for artifact in cfg["artifacts"]}
+    for route in cfg["routes"]:
+        artifact = artifacts[route["artifact"]]
+        bucket = artifact["bucket"]
+        previous = previous_contracts.get(bucket)
+        access = "protected" if (
+            route["access"] == "protected" or previous and previous["access"] == "protected"
+        ) else route["access"]
+        contracts[bucket] = {
+            "access": access,
+            "artifact": route["artifact"],
+            "immutable_prefixes": sorted(set(
+                (previous or {}).get("immutable_prefixes", []) + immutable_prefixes(artifact, route)
+            )),
+            "path": route["path"],
+        }
+    return contracts
+
+
+def write_route_contracts(app_dir, contracts):
+    app_dir.mkdir(parents=True, exist_ok=True)
+    document = {
+        "schemaVersion": 1,
+        "buckets": {
+            bucket: {
+                "access": contract["access"],
+                "artifact": contract["artifact"],
+                "immutablePrefixes": contract["immutable_prefixes"],
+                "routePath": contract["path"],
+            }
+            for bucket, contract in sorted(contracts.items())
+        },
+    }
+    (app_dir / HISTORY_FILE).write_text(f"{json.dumps(document, indent=2, sort_keys=True)}\n")
+
+
+def _valid_immutable_prefix(value):
+    return (isinstance(value, str) and value and not value.startswith("/")
+            and not value.endswith("/") and ".." not in PurePosixPath(value).parts)
+
+
+def validate_route_migrations(cfg, previous_contracts):
+    artifacts = {artifact["name"]: artifact for artifact in cfg["artifacts"]}
+    for route in cfg["routes"]:
+        artifact = artifacts[route["artifact"]]
+        previous = previous_contracts.get(artifact["bucket"])
+        if (previous and previous["access"] == "protected"
+                and route["access"] in {"public", "legacy"}
+        ):
+            raise RuntimeError(
+                f"artifact {route['artifact']} cannot become public while reusing protected "
+                f"bucket {artifact['bucket']}"
+            )
+
+
+def deploy_static(site_name, site_dir, action_dir, token, cfg):
+    artifact_by_name = {artifact["name"]: artifact for artifact in cfg["artifacts"]}
+    credential_env_names = {
+        name for artifact in cfg["artifacts"] for name in artifact["credentials"].values()
+    }
+    validate_publication_environment(cfg)
+    for artifact in cfg["artifacts"]:
+        validate_artifact_output(site_dir, artifact)
     apps_dir = clone_apps(token)
     app_dir = apps_dir / "sjc001" / "websites" / site_name
     manifests_dir = app_dir / "manifests"
+    previous_contracts = previous_route_contracts(app_dir)
+    validate_route_migrations(cfg, previous_contracts)
+    # Complete immutable work across the whole publication before any route's
+    # mutable pointers can change. Partial immutable success is safe; mixing a
+    # new route with an old route after a later immutable failure is not.
+    for route in cfg["routes"]:
+        publish_route_immutables(
+            artifact_by_name[route["artifact"]], route, site_dir, credential_env_names,
+        )
+    for route in cfg["routes"]:
+        s3_sync(
+            artifact_by_name[route["artifact"]], route, site_dir, credential_env_names,
+            previous_contracts.get(artifact_by_name[route["artifact"]]["bucket"]),
+        )
+    if cfg["compatibility"]:
+        ensure_bucket_aliases(site_name, cfg["aliases"], os.environ.get("GARAGE_ADMIN_TOKEN"))
 
+    write_route_contracts(app_dir, next_route_contracts(cfg, previous_contracts))
     render_site_manifests(site_name, action_dir, app_dir, manifests_dir, cfg)
 
-    commit_and_push(apps_dir, f"Deploy {site_name}")
+    commit_and_push(apps_dir, f"Deploy {site_name}", token)
 
 
-def decommission(site_name, token):
+def decommission(site_name, token, buckets=None):
     """Remove manifests from apps repo."""
-    user = env("CI_BOT_USER", "ci-bot")
+    apps_dir = clone_apps(token)
-    with tempfile.TemporaryDirectory() as tmp:
-        apps_dir = Path(tmp)
-        run(f"git clone --depth 1 https://{user}:{token}@{GITEA_HOST}/fritzlab/apps.git {apps_dir}")
     site_path = apps_dir / "sjc001" / "websites" / site_name
     if not site_path.exists():
         print(f"No manifests for {site_name} — nothing to remove")
         return
+    history_path = site_path / HISTORY_FILE
+    history = history_path.read_bytes() if history_path.exists() else None
     shutil.rmtree(site_path)
-        run(f"git -C {apps_dir} config user.name {user}")
+    if history is not None:
-        run(f"git -C {apps_dir} config user.email {user}@fritzlab.net")
+        site_path.mkdir(parents=True)
-        commit_and_push(apps_dir, f"Decommission {site_name}")
+        (site_path / HISTORY_FILE).write_bytes(history)
-    print(f"Bucket {site_name} and its objects are NOT purged automatically.")
+    commit_and_push(apps_dir, f"Decommission {site_name}", token)
-    print(f"  garage bucket delete {site_name} --yes")
+    for bucket in buckets or [site_name]:
+        print(f"Bucket {bucket} and its objects are NOT purged automatically.")
+        print(f"  garage bucket delete {bucket} --yes")
 
 
 def cmd_deploy():
@@ -173,7 +489,8 @@ def cmd_deploy():
 
     if not cfg["enabled"]:
         print("Site disabled — running decommission...")
-        decommission(site_name, token)
+        decommission(site_name, token, [artifact["bucket"] for artifact in cfg["artifacts"]])
         return
 
+    validate_artifact_inputs(site_dir, cfg)
     deploy_static(site_name, site_dir, action_dir, token, cfg)

scripts/git-askpass.sh

@@ -0,0 +1,5 @@
+#!/bin/sh
+case "$1" in
+  *Username*) printf '%s\n' "$CI_BOT_USER" ;;
+  *) printf '%s\n' "$CI_BOT_TOKEN" ;;
+esac

scripts/setup.py

@@ -24,9 +24,10 @@ def ensure_aws():
     subprocess.run(["aws", "--version"], check=True)
 
 
-def ensure_jinja2():
+def ensure_python_dependencies():
     try:
         import jinja2
+        import yaml
     except ImportError:
         print("Installing jinja2 + pyyaml...")
         subprocess.run(
@@ -36,6 +37,6 @@ def ensure_jinja2():
 
 
 if __name__ == "__main__":
-    ensure_jinja2()
+    ensure_python_dependencies()
     ensure_aws()
     print("Setup complete")

scripts/utils.py

@@ -1,26 +1,34 @@
 """Shared utilities for the site-publish action."""
 
 import os
+import re
 import shutil
 import subprocess
 import sys
-from pathlib import Path
+from pathlib import Path, PurePosixPath
+from urllib.parse import urlparse
 
 import yaml
-from jinja2 import Environment, FileSystemLoader
+from jinja2 import Environment, FileSystemLoader, StrictUndefined
 
 APPS_REPO = "fritzlab/apps"
 GITEA_HOST = "code.fritzlab.net"
 NAMESPACE = "websites"
 DEFAULT_S3_ENDPOINT = "http://garage-s3.storage.svc:3900"
+DEFAULT_WEBSITE_SUFFIX = "web.sjc001.fritzlab.net"
+DEFAULT_CACHE_CONTROL = "public, max-age=0, must-revalidate"
 
 EXCLUDE_FILES = {
-    ".git", ".gitea", ".gitignore", "site.yaml",
+    ".git", ".gitea", ".gitignore", "site.yaml", "build", ".site-publish",
-    "build", "Makefile", "README.md", "CLAUDE.md",
+    "Makefile", "README.md", "CLAUDE.md", "Dockerfile", ".dockerignore",
-    "Dockerfile", ".dockerignore", "go.mod", "go.sum",
+    "go.mod", "go.sum",
 }
-
 VALID_TYPES = {"static", "hugo", "mkdocs"}
+NAME_RE = re.compile(r"^[a-z0-9](?:[a-z0-9-]{0,61}[a-z0-9])?$")
+ENV_RE = re.compile(r"^[A-Z_][A-Z0-9_]*$")
+ACCESS_KEY_ENV_RE = re.compile(r"^([A-Z][A-Z0-9_]*)_S3_ACCESS_KEY$")
+BUCKET_RE = re.compile(r"^[a-z0-9](?:[a-z0-9.-]{1,61}[a-z0-9])?$")
+MIDDLEWARE_RE = re.compile(r"^[A-Za-z0-9](?:[A-Za-z0-9_-]{0,61}[A-Za-z0-9])?$")
 
 DOCKER_DEPRECATION_MSG = """\
 type: docker is no longer supported by action/site-publish.
@@ -42,113 +50,498 @@ example.\
 """
 
 
+class ConfigError(ValueError):
+    """A site.yaml contract violation."""
+
+
 def k8s_name(name):
-    """Sanitize for DNS-1035 label (dots → dashes)."""
     return name.replace(".", "-")
 
 
 def env(key, default=None):
     val = os.environ.get(key, default)
-    if val is None:
+    if val is None or val == "":
         die(f"Missing required env var: {key}")
     return val
 
 
 def die(msg):
     print(f"ERROR: {msg}", file=sys.stderr)
-    sys.exit(1)
+    raise SystemExit(1)
 
 
-def run(cmd, **kwargs):
+def run(cmd, *, display=None, **kwargs):
-    print(f"  $ {cmd}")
+    """Run an argv command, printing only a safe display form."""
-    return subprocess.run(cmd, shell=True, check=True, **kwargs)
+    if not isinstance(cmd, (list, tuple)):
+        raise TypeError("run() requires an argv list")
+    shown = display if display is not None else " ".join(str(part) for part in cmd)
+    print(f"  $ {shown}")
+    return subprocess.run(cmd, check=True, **kwargs)
 
 
-def parse_site_yaml(site_dir):
+def _mapping(value, label):
-    path = Path(site_dir) / "site.yaml"
+    if not isinstance(value, dict):
-    if not path.exists():
+        raise ConfigError(f"{label} must be a mapping")
-        die("site.yaml not found in repo root")
+    return value
 
-    with open(path) as f:
-        cfg = yaml.safe_load(f)
 
-    if not cfg.get("domain"):
+def _list(value, label):
-        die("domain is required in site.yaml")
+    if not isinstance(value, list):
+        raise ConfigError(f"{label} must be a list")
+    return value
 
-    site_type = cfg.get("type", "static")
 
+def _known_keys(value, allowed, label):
+    unknown = set(value) - set(allowed)
+    if unknown:
+        raise ConfigError(f"{label} has unknown fields: {', '.join(sorted(unknown))}")
+
+
+def _strings(value, label):
+    values = _list(value or [], label)
+    if any(not isinstance(item, str) or not item for item in values):
+        raise ConfigError(f"{label} must be a list of non-empty strings")
+    return values
+
+
+def _hostname(value, label):
+    if not isinstance(value, str) or len(value) > 253 or value.endswith("."):
+        raise ConfigError(f"{label} must be a lowercase DNS hostname without a trailing dot")
+    labels = value.split(".")
+    if len(labels) < 2 or any(not NAME_RE.fullmatch(part) for part in labels):
+        raise ConfigError(f"{label} must be a lowercase DNS hostname without a trailing dot")
+    return value
+
+
+def _aliases(value, domain):
+    aliases = _strings(value or [], "aliases")
+    aliases = [_hostname(alias, "aliases entry") for alias in aliases]
+    if len(aliases) != len(set(aliases)) or domain in aliases:
+        raise ConfigError("aliases must be unique and cannot repeat domain")
+    return aliases
+
+
+def _relative_path(value, label, *, allow_root=False):
+    value = "" if value is None else value
+    if not isinstance(value, str):
+        raise ConfigError(f"{label} must be a string")
+    if value == "/" and allow_root:
+        return ""
+    path = PurePosixPath(value)
+    if path.is_absolute() or ".." in path.parts:
+        raise ConfigError(f"{label} must be a relative path without '..'")
+    normalized = str(path).strip("/")
+    return "" if normalized == "." else normalized
+
+
+def _route_path(value, label):
+    if not isinstance(value, str) or not value.startswith("/"):
+        raise ConfigError(f"{label} must start with '/'")
+    if "//" in value or "?" in value or "#" in value or ".." in value.split("/"):
+        raise ConfigError(f"{label} is not a canonical URL path")
+    normalized = value.rstrip("/") or "/"
+    if not re.fullmatch(r"/[A-Za-z0-9._~/-]*", normalized):
+        raise ConfigError(f"{label} contains unsupported URL path characters")
+    return normalized
+
+
+def _middlewares(value, label):
+    names = _strings(value, label)
+    if any(not MIDDLEWARE_RE.fullmatch(name) for name in names):
+        raise ConfigError(f"{label} contains an invalid middleware name")
+    if len(names) != len(set(names)):
+        raise ConfigError(f"{label} contains duplicate middleware names")
+    return names
+
+
+def _cache_control(value, label):
+    if not isinstance(value, str) or not value.strip():
+        raise ConfigError(f"{label} must be a non-empty Cache-Control value")
+    directives = [part.strip().lower() for part in value.split(",")]
+    names = [part.split("=", 1)[0] for part in directives]
+    if len(names) != len(set(names)):
+        raise ConfigError(f"{label} repeats a Cache-Control directive")
+    present = set(names)
+    if {"public", "private"} <= present:
+        raise ConfigError(f"{label} cannot be both public and private")
+    ages = {}
+    for part in directives:
+        name = part.split("=", 1)[0]
+        if name in {"max-age", "s-maxage"}:
+            raw = part.split("=", 1)[1] if "=" in part else ""
+            if not raw.isdigit():
+                raise ConfigError(f"{label} {name} must be a non-negative integer")
+            ages[name] = int(raw)
+    max_age = ages.get("max-age")
+    if "immutable" in present and (not max_age or present & {"no-store", "no-cache", "must-revalidate"}):
+        raise ConfigError(f"{label} immutable requires positive max-age without revalidation")
+    if "no-store" in present and any(ages.values()):
+        raise ConfigError(f"{label} no-store contradicts positive caching")
+    if "private" in present and ages.get("s-maxage"):
+        raise ConfigError(f"{label} private contradicts shared-cache max-age")
+    return ", ".join(part.strip() for part in value.split(","))
+
+
+def _site_type(value, label):
+    site_type = value or "static"
     if site_type == "docker":
-        die(DOCKER_DEPRECATION_MSG)
+        raise ConfigError(DOCKER_DEPRECATION_MSG)
-
     if site_type not in VALID_TYPES:
-        die(f"Unknown site type: {site_type} (valid: {', '.join(sorted(VALID_TYPES))})")
+        raise ConfigError(f"Unknown {label}: {site_type} (valid: {', '.join(sorted(VALID_TYPES))})")
+    return site_type
 
-    excludes = cfg.get("excludes") or []
-    if not isinstance(excludes, list) or any(not isinstance(p, str) for p in excludes):
-        die("excludes must be a list of string patterns")
 
-    middlewares = cfg.get("middlewares") or []
+def _endpoint(value, label):
-    if not isinstance(middlewares, list) or any(not isinstance(m, str) for m in middlewares):
+    parsed = urlparse(value)
-        die("middlewares must be a list of Traefik file-provider middleware names")
+    if parsed.scheme not in {"http", "https"} or not parsed.hostname or parsed.path not in {"", "/"}:
+        raise ConfigError(f"{label} must be an http(s) origin without a path")
+    return value.rstrip("/")
 
-    site = {
+
-        "domain": cfg["domain"],
+def _legacy_config(raw, site_name):
-        "type": site_type,
+    if not isinstance(raw.get("tidy", True), bool):
-        "enabled": cfg.get("enabled", True),
+        raise ConfigError("tidy must be a boolean")
-        "aliases": cfg.get("aliases") or [],
+    if not isinstance(raw.get("enabled", True), bool):
-        "content_dir": cfg.get("content_dir", ""),
+        raise ConfigError("enabled must be a boolean")
-        "tidy": cfg.get("tidy", True),
+    artifact = {
-        "excludes": excludes,
+        "name": "site",
+        "type": _site_type(raw.get("type", "static"), "site type"),
+        "content_dir": _relative_path(raw.get("content_dir", ""), "content_dir"),
+        "tidy": raw.get("tidy", True),
+        "excludes": _strings(raw.get("excludes") or [], "excludes"),
+        "build_dir": "build/html",
+        "bucket": site_name,
+        "s3_endpoint": os.environ.get("GARAGE_S3_ENDPOINT") or DEFAULT_S3_ENDPOINT,
+        "website_authority": "garage-s3.storage.svc.k8s.sjc001.fritzlab.net",
+        "credentials": {"access_key_env": "AWS_ACCESS_KEY_ID", "secret_key_env": "AWS_SECRET_ACCESS_KEY"},
+        "cache_rules": [{"path": "", "cache_control": DEFAULT_CACHE_CONTROL}],
+    }
+    return {
+        "version": 1,
+        "compatibility": "single-surface-v1",
+        "domain": raw["domain"],
+        "aliases": _aliases(raw.get("aliases"), raw["domain"]),
+        "enabled": raw.get("enabled", True),
+        "artifacts": [artifact],
+        "routes": [{
+            "name": "site", "path": "/", "artifact": "site", "access": "legacy",
+            "access_middleware": None,
+            "middlewares": _middlewares(raw.get("middlewares") or [], "middlewares"),
+        }],
+    }
+
+
+def _artifact(item, index):
+    label = f"artifacts[{index}]"
+    item = _mapping(item, label)
+    _known_keys(item, {"name", "type", "content_dir", "tidy", "excludes", "publish", "cache"}, label)
+    name = item.get("name")
+    if not isinstance(name, str) or not NAME_RE.fullmatch(name):
+        raise ConfigError(f"{label}.name must be a DNS label")
+    publish = _mapping(item.get("publish"), f"{label}.publish")
+    _known_keys(publish, {"bucket", "credentials"}, f"{label}.publish")
+    bucket = publish.get("bucket")
+    if not isinstance(bucket, str) or not BUCKET_RE.fullmatch(bucket):
+        raise ConfigError(f"{label}.publish.bucket is not a valid bucket name")
+    credentials = _mapping(publish.get("credentials"), f"{label}.publish.credentials")
+    _known_keys(credentials, {"access_key_env", "secret_key_env"}, f"{label}.publish.credentials")
+    normalized_credentials = {}
+    for key in ("access_key_env", "secret_key_env"):
+        value = credentials.get(key)
+        if not isinstance(value, str) or not ENV_RE.fullmatch(value):
+            raise ConfigError(f"{label}.publish.credentials.{key} must name an environment variable")
+        normalized_credentials[key] = value
+    access_match = ACCESS_KEY_ENV_RE.fullmatch(normalized_credentials["access_key_env"])
+    expected_secret = (
+        f"{access_match.group(1)}_S3_SECRET_KEY" if access_match else None
+    )
+    if normalized_credentials["secret_key_env"] != expected_secret:
+        raise ConfigError(
+            f"{label}.publish.credentials must be a matched "
+            "<NAME>_S3_ACCESS_KEY and <NAME>_S3_SECRET_KEY pair"
+        )
+    cache = _mapping(item.get("cache"), f"{label}.cache")
+    _known_keys(cache, {"rules"}, f"{label}.cache")
+    rules = _list(cache.get("rules"), f"{label}.cache.rules")
+    if not rules:
+        raise ConfigError(f"{label}.cache.rules must declare a '/' default")
+    cache_rules, paths = [], set()
+    for rule_index, rule in enumerate(rules):
+        rule_label = f"{label}.cache.rules[{rule_index}]"
+        rule = _mapping(rule, rule_label)
+        _known_keys(rule, {"path", "cache_control"}, rule_label)
+        path = _relative_path(rule.get("path"), f"{rule_label}.path", allow_root=True)
+        if path in paths:
+            raise ConfigError(f"{label}.cache.rules has duplicate path /{path}")
+        paths.add(path)
+        cache_rules.append({"path": path, "cache_control": _cache_control(
+            rule.get("cache_control"), f"{rule_label}.cache_control"
+        )})
+    if "" not in paths:
+        raise ConfigError(f"{label}.cache.rules must declare a '/' default")
+    cache_rules.sort(key=lambda rule: (len(PurePosixPath(rule["path"]).parts), rule["path"]))
+    immutable_paths = [rule["path"] for rule in cache_rules
+                       if "immutable" in {part.strip().lower().split("=", 1)[0]
+                                          for part in rule["cache_control"].split(",")}]
+    if "" in immutable_paths:
+        raise ConfigError(f"{label}.cache.rules immutable paths must be narrower than '/'")
+    for path in immutable_paths:
+        if any(other.startswith(f"{path}/") for other in paths):
+            raise ConfigError(f"{label}.cache.rules cannot nest another policy under immutable /{path}")
+    authority = f"{bucket}.{DEFAULT_WEBSITE_SUFFIX}"
+    if not isinstance(item.get("tidy", True), bool):
+        raise ConfigError(f"{label}.tidy must be a boolean")
+    return {
+        "name": name,
+        "type": _site_type(item.get("type", "static"), f"{label}.type"),
+        "content_dir": _relative_path(item.get("content_dir", ""), f"{label}.content_dir"),
+        "tidy": item.get("tidy", True),
+        "excludes": _strings(item.get("excludes") or [], f"{label}.excludes"),
+        "build_dir": f".site-publish/{name}/html",
+        "bucket": bucket,
+        "s3_endpoint": DEFAULT_S3_ENDPOINT,
+        "website_authority": authority,
+        "credentials": normalized_credentials,
+        "cache_rules": cache_rules,
+    }
+
+
+def _route(item, index):
+    label = f"routes[{index}]"
+    item = _mapping(item, label)
+    _known_keys(item, {"name", "path", "artifact", "access", "middlewares"}, label)
+    name = item.get("name")
+    if not isinstance(name, str) or not NAME_RE.fullmatch(name):
+        raise ConfigError(f"{label}.name must be a DNS label")
+    access = _mapping(item.get("access"), f"{label}.access")
+    _known_keys(access, {"mode", "middleware"}, f"{label}.access")
+    mode, middleware = access.get("mode"), access.get("middleware")
+    if mode not in {"public", "protected"}:
+        raise ConfigError(f"{label}.access.mode must be public or protected")
+    if mode == "protected" and (not isinstance(middleware, str) or not MIDDLEWARE_RE.fullmatch(middleware)):
+        raise ConfigError(f"{label}.access.middleware is required for protected access")
+    if mode == "public" and middleware is not None:
+        raise ConfigError(f"{label}.access.middleware is forbidden for public access")
+    middlewares = _middlewares(item.get("middlewares") or [], f"{label}.middlewares")
+    if middleware in middlewares:
+        raise ConfigError(f"{label} repeats its access middleware")
+    artifact = item.get("artifact")
+    if not isinstance(artifact, str):
+        raise ConfigError(f"{label}.artifact must name an artifact")
+    return {
+        "name": name, "path": _route_path(item.get("path"), f"{label}.path"),
+        "artifact": artifact, "access": mode, "access_middleware": middleware,
         "middlewares": middlewares,
     }
 
+
+def _validate_multi(cfg):
+    artifacts, routes = cfg["artifacts"], cfg["routes"]
+    artifact_names = [item["name"] for item in artifacts]
+    route_names = [item["name"] for item in routes]
+    route_paths = [item["path"] for item in routes]
+    if len(artifact_names) != len(set(artifact_names)):
+        raise ConfigError("artifact names must be unique")
+    if len(route_names) != len(set(route_names)):
+        raise ConfigError("route names must be unique")
+    if len(route_paths) != len(set(route_paths)):
+        raise ConfigError("route paths are ambiguous after normalization")
+    if "/" not in route_paths:
+        raise ConfigError("routes must declare a '/' catch-all")
+    artifact_by_name = {item["name"]: item for item in artifacts}
+    references = {name: [] for name in artifact_by_name}
+    for route in routes:
+        if route["artifact"] not in artifact_by_name:
+            raise ConfigError(f"route {route['name']} references unknown artifact {route['artifact']}")
+        references[route["artifact"]].append(route)
+    for name, used_by in references.items():
+        if len(used_by) != 1:
+            raise ConfigError(f"artifact {name} must be referenced by exactly one route")
+    buckets, authorities, credential_owners = {}, {}, {}
+    for route in routes:
+        artifact = artifact_by_name[route["artifact"]]
+        if artifact["bucket"] in buckets:
+            other_access, other_name = buckets[artifact["bucket"]]
+            if other_access != route["access"]:
+                raise ConfigError(f"bucket {artifact['bucket']} cannot be reused by protected and public routes")
+            raise ConfigError(f"bucket {artifact['bucket']} must belong to one artifact ({other_name})")
+        buckets[artifact["bucket"]] = (route["access"], artifact["name"])
+        if artifact["website_authority"] in authorities:
+            raise ConfigError(
+                f"website authority {artifact['website_authority']} must belong to one artifact"
+            )
+        authorities[artifact["website_authority"]] = artifact["name"]
+        for variable in artifact["credentials"].values():
+            if variable in credential_owners:
+                raise ConfigError(
+                    f"publication credential {variable} is reused by artifacts "
+                    f"{credential_owners[variable]} and {artifact['name']}"
+                )
+            credential_owners[variable] = artifact["name"]
+        for cache_rule in artifact["cache_rules"]:
+            directives = {part.strip().lower().split("=", 1)[0]
+                          for part in cache_rule["cache_control"].split(",")}
+            if route["access"] == "protected" and "public" in directives:
+                raise ConfigError(f"protected route {route['name']} cannot use public cache policy")
+            if route["access"] == "protected" and not directives & {"private", "no-store"}:
+                raise ConfigError(f"protected route {route['name']} cache policy must be private or no-store")
+            if route["access"] == "protected" and "s-maxage" in directives:
+                raise ConfigError(f"protected route {route['name']} cannot use shared-cache max-age")
+            if route["access"] == "public" and "private" in directives:
+                raise ConfigError(f"public route {route['name']} cannot use private cache policy")
+    root = next(route for route in routes if route["path"] == "/")
+    if any(route["access"] == "protected" for route in routes) and root["access"] == "public":
+        raise ConfigError("a public '/' catch-all would expose unmatched protected content")
+
+
+def normalize_site_config(raw, site_name):
+    raw = _mapping(raw, "site.yaml")
+    domain = _hostname(raw.get("domain"), "domain")
+    if not isinstance(raw.get("enabled", True), bool):
+        raise ConfigError("enabled must be a boolean")
+    if ("artifacts" in raw) != ("routes" in raw):
+        raise ConfigError("artifacts and routes must be declared together")
+    if "artifacts" not in raw:
+        return _legacy_config(raw, site_name)
+    legacy_fields = {"type", "content_dir", "tidy", "excludes", "middlewares"} & set(raw)
+    if legacy_fields:
+        raise ConfigError("legacy fields cannot be mixed with artifacts/routes: " + ", ".join(sorted(legacy_fields)))
+    _known_keys(raw, {"domain", "aliases", "enabled", "artifacts", "routes"}, "site.yaml")
+    artifacts = [_artifact(item, index) for index, item in enumerate(_list(raw["artifacts"], "artifacts"))]
+    routes = [_route(item, index) for index, item in enumerate(_list(raw["routes"], "routes"))]
+    if not artifacts or not routes:
+        raise ConfigError("artifacts and routes must not be empty")
+    cfg = {
+        "version": 2, "compatibility": None, "domain": domain,
+        "aliases": _aliases(raw.get("aliases"), domain),
+        "enabled": raw.get("enabled", True),
+        "artifacts": sorted(artifacts, key=lambda item: item["name"]),
+        "routes": sorted(routes, key=lambda item: (-len(item["path"]), item["path"], item["name"])),
+    }
+    _validate_multi(cfg)
+    for route in cfg["routes"]:
+        if len(f"{k8s_name(site_name)}-{route['name']}") > 63:
+            raise ConfigError(f"route {route['name']} makes the generated Service name exceed 63 characters")
+    return cfg
+
+
+def validate_artifact_inputs(site_dir, cfg):
+    """Reject source containment before a public or protected build starts."""
+    if cfg["compatibility"]:
+        return
+    root = Path(site_dir).resolve()
+    sources = []
+    for artifact in cfg["artifacts"]:
+        declared = root
+        for component in Path(artifact["content_dir"]).parts:
+            declared /= component
+            if declared.is_symlink():
+                raise ConfigError(
+                    f"artifact {artifact['name']} content_dir contains symlink component: "
+                    f"{declared.relative_to(root)}"
+                )
+        source = declared.resolve()
+        if source != root and root not in source.parents:
+            raise ConfigError(
+                f"artifact {artifact['name']} content_dir resolves outside the repository"
+            )
+        if source.exists():
+            symlink = next((path for path in source.rglob("*") if path.is_symlink()), None)
+            if symlink is not None:
+                raise ConfigError(
+                    f"artifact {artifact['name']} build input contains symlink: "
+                    f"{symlink.relative_to(root)}"
+                )
+        sources.append((artifact["name"], source))
+    for index, (name, source) in enumerate(sources):
+        for other_name, other_source in sources[index + 1:]:
+            if source == other_source or source in other_source.parents or other_source in source.parents:
+                raise ConfigError(
+                    f"artifact build inputs overlap after resolution: {name} and {other_name}"
+                )
+
+
+def parse_site_yaml(site_dir, site_name=None):
+    path = Path(site_dir) / "site.yaml"
+    if not path.exists():
+        die("site.yaml not found in repo root")
+    if site_name is None:
+        repo = os.environ.get("SITE_REPO", "")
+        site_name = repo.split("/", 1)[-1] if "/" in repo else Path(site_dir).name
+    try:
+        with open(path) as stream:
+            cfg = normalize_site_config(yaml.safe_load(stream), site_name)
+    except (ConfigError, yaml.YAMLError) as exc:
+        die(str(exc))
     print("Site config:")
-    for k, v in site.items():
+    print(f"  domain: {cfg['domain']}")
-        print(f"  {k}: {v}")
+    print(f"  contract: {cfg['compatibility'] or 'split-surface-v2'}")
-    return site
+    print(f"  artifacts: {[item['name'] for item in cfg['artifacts']]}")
+    print(f"  routes: {[(item['path'], item['access']) for item in cfg['routes']]}")
+    return cfg
 
 
 def clone_apps(token):
+    """Clone Apps without placing the credential in argv or output."""
     user = env("CI_BOT_USER", "ci-bot")
     apps_dir = Path("/tmp/apps-deploy")
     if apps_dir.exists():
         shutil.rmtree(apps_dir)
-    run(f"git clone --depth 1 https://{user}:{token}@{GITEA_HOST}/{APPS_REPO}.git {apps_dir}")
+    clone_env = git_auth_env(token)
-    run(f"git -C {apps_dir} config user.name {user}")
+    url = f"https://{user}@{GITEA_HOST}/{APPS_REPO}.git"
-    run(f"git -C {apps_dir} config user.email {user}@fritzlab.net")
+    run(["git", "clone", "--depth", "1", url, str(apps_dir)],
+        display=f"git clone --depth 1 https://{user}@{GITEA_HOST}/{APPS_REPO}.git {apps_dir}", env=clone_env)
+    run(["git", "-C", str(apps_dir), "config", "user.name", user])
+    run(["git", "-C", str(apps_dir), "config", "user.email", f"{user}@fritzlab.net"])
     return apps_dir
 
 
 def render_templates(action_dir, template_vars, app_dir, manifests_dir):
-    """Render Jinja2 templates for a static-content site."""
+    """Render one certificate and deterministic per-route resources."""
-    templates_dir = Path(action_dir) / "templates"
+    jinja_env = Environment(loader=FileSystemLoader(str(Path(action_dir) / "templates")),
-    jinja_env = Environment(
+                            keep_trailing_newline=True, undefined=StrictUndefined)
-        loader=FileSystemLoader(str(templates_dir)),
+    manifests_dir.mkdir(parents=True, exist_ok=True)
-        keep_trailing_newline=True,
+    for child in manifests_dir.iterdir():
-    )
+        if child.is_file() and child.suffix in {".yaml", ".yml"}:
-
+            child.unlink()
-    tmpl_names = ["app.yaml.j2", "certificate.yaml.j2", "ingress.yaml.j2",
+    route_files = []
-                  "kustomization.yaml.j2", "service.yaml.j2"]
+    for route in template_vars["routes"]:
-
+        stem = "" if template_vars["compatibility"] else f"-{route['name']}"
-    for tmpl_name in tmpl_names:
+        for kind in ("service", "ingress"):
-        tmpl = jinja_env.get_template(tmpl_name)
+            out_name = f"{kind}{stem}.yaml"
-        rendered = tmpl.render(**template_vars)
+            destination = manifests_dir / out_name
-        out_name = tmpl_name.replace(".j2", "")
+            destination.write_text(jinja_env.get_template(f"{kind}.yaml.j2").render(
-        dest = app_dir / out_name if tmpl_name == "app.yaml.j2" else manifests_dir / out_name
+                **template_vars, route=route
-        dest.write_text(rendered)
+            ))
-        print(f"  Rendered {tmpl_name} -> {dest}")
+            route_files.append(out_name)
+            print(f"  Rendered {kind}.yaml.j2 -> {destination}")
+    common_vars = {**template_vars, "route_files": route_files}
+    for out_name, destination in {
+        "certificate.yaml": manifests_dir / "certificate.yaml",
+        "kustomization.yaml": manifests_dir / "kustomization.yaml",
+        "app.yaml": app_dir / "app.yaml",
+    }.items():
+        destination.write_text(jinja_env.get_template(f"{out_name}.j2").render(**common_vars))
+        print(f"  Rendered {out_name}.j2 -> {destination}")
 
 
-def commit_and_push(apps_dir, message):
+def git_auth_env(token):
-    run(f"git -C {apps_dir} add -A")
+    """Return credential-safe Git authentication shared by clone and push."""
-    result = subprocess.run(
+    auth_env = os.environ.copy()
-        f"git -C {apps_dir} diff --cached --quiet",
+    auth_env["CI_BOT_TOKEN"] = token
-        shell=True, check=False,
+    auth_env["GIT_ASKPASS"] = str(Path(__file__).with_name("git-askpass.sh"))
-    )
+    auth_env["GIT_TERMINAL_PROMPT"] = "0"
+    return auth_env
+
+
+def commit_and_push(apps_dir, message, token=None):
+    run(["git", "-C", str(apps_dir), "add", "-A"])
+    result = subprocess.run(["git", "-C", str(apps_dir), "diff", "--cached", "--quiet"], check=False)
     if result.returncode == 0:
         print("No manifest changes to commit")
         return False
-    run(f"git -C {apps_dir} commit -m '{message}'")
+    run(["git", "-C", str(apps_dir), "commit", "-m", message])
-    run(f"git -C {apps_dir} push")
+    push_env = git_auth_env(token) if token else None
+    run(["git", "-C", str(apps_dir), "push"], env=push_env)
     print("Manifests pushed — ArgoCD will sync")
     return True

templates/ingress.yaml.j2

@@ -1,12 +1,10 @@
 apiVersion: networking.k8s.io/v1
 kind: Ingress
 metadata:
-  name: {{ site_k8s }}
+  name: {{ route.resource_name }}
   namespace: {{ namespace }}
-{%- if site_type != "docker" %}
   annotations:
-    traefik.ingress.kubernetes.io/router.middlewares: https-redirect@file,retry-upstream@file{% for m in middlewares %},{{ m }}@file{% endfor %}
+    traefik.ingress.kubernetes.io/router.middlewares: https-redirect@file,retry-upstream@file{% if route.access_middleware %},{{ route.access_middleware }}@file{% endif %}{% for m in route.middlewares %},{{ m }}@file{% endfor %}
-{%- endif %}
 spec:
   ingressClassName: traefik
   tls:
@@ -20,22 +18,22 @@ spec:
   - host: {{ domain }}
     http:
       paths:
-      - path: /
+      - path: {{ route.path }}
         pathType: Prefix
         backend:
           service:
-            name: {{ site_k8s }}
+            name: {{ route.resource_name }}
             port:
               number: 80
 {%- for alias in aliases %}
   - host: {{ alias }}
     http:
       paths:
-      - path: /
+      - path: {{ route.path }}
         pathType: Prefix
         backend:
           service:
-            name: {{ site_k8s }}
+            name: {{ route.resource_name }}
             port:
               number: 80
 {%- endfor %}

templates/kustomization.yaml.j2

@@ -1,6 +1,7 @@
 apiVersion: kustomize.config.k8s.io/v1beta1
 kind: Kustomization
 resources:
-- service.yaml
+{% for route_file in route_files -%}
-- ingress.yaml
+- {{ route_file }}
+{% endfor -%}
 - certificate.yaml

templates/service.yaml.j2

@@ -1,11 +1,15 @@
 apiVersion: v1
 kind: Service
 metadata:
-  name: {{ site_k8s }}
+  name: {{ route.resource_name }}
   namespace: {{ namespace }}
+{%- if not compatibility %}
+  annotations:
+    traefik.ingress.kubernetes.io/service.passhostheader: "false"
+{%- endif %}
 spec:
   type: ExternalName
-  externalName: garage.storage.svc.k8s.sjc001.fritzlab.net
+  externalName: {{ route.artifact_config.website_authority }}
   ports:
   - port: 80
     targetPort: 80

tests/fixtures/legacy-site.yaml

@@ -0,0 +1,9 @@
+domain: example.fritzlab.net
+type: static
+content_dir: html
+aliases:
+  - www.example.fritzlab.net
+middlewares:
+  - response-headers
+excludes:
+  - media/*

tests/fixtures/split-site.yaml

@@ -0,0 +1,42 @@
+domain: baseline.fritzlab.net
+artifacts:
+  - name: portal
+    type: static
+    content_dir: portal/build
+    publish:
+      bucket: baseline-portal
+      credentials:
+        access_key_env: PORTAL_S3_ACCESS_KEY
+        secret_key_env: PORTAL_S3_SECRET_KEY
+    cache:
+      rules:
+        - path: /
+          cache_control: private, no-store
+  - name: distributions
+    type: static
+    content_dir: dist
+    publish:
+      bucket: baseline-dist
+      credentials:
+        access_key_env: DIST_S3_ACCESS_KEY
+        secret_key_env: DIST_S3_SECRET_KEY
+    cache:
+      rules:
+        - path: /
+          cache_control: public, max-age=0, must-revalidate
+        - path: releases
+          cache_control: public, max-age=31536000, immutable
+        - path: channels
+          cache_control: public, max-age=0, must-revalidate
+routes:
+  - name: portal
+    path: /
+    artifact: portal
+    access:
+      mode: protected
+      middleware: authentik-forwardauth
+  - name: distributions
+    path: /dist
+    artifact: distributions
+    access:
+      mode: public

tests/test_contract.py

@@ -0,0 +1,698 @@
+import base64
+import copy
+import hashlib
+import io
+import json
+import os
+import socket
+import subprocess
+import sys
+import tempfile
+import threading
+import unittest
+from contextlib import redirect_stderr, redirect_stdout
+from http.server import BaseHTTPRequestHandler, ThreadingHTTPServer
+from pathlib import Path
+from urllib.parse import urlsplit
+from unittest.mock import patch
+
+import yaml
+
+ROOT = Path(__file__).resolve().parents[1]
+sys.path.insert(0, str(ROOT / "scripts"))
+
+import deploy
+import build
+import utils
+from utils import ConfigError, normalize_site_config, validate_artifact_inputs
+
+
+def fixture(name):
+    return yaml.safe_load((ROOT / "tests" / "fixtures" / name).read_text())
+
+
+class IPv6GitHTTPServer(ThreadingHTTPServer):
+    address_family = socket.AF_INET6
+
+
+class AuthenticatedGitHandler(BaseHTTPRequestHandler):
+    project_root = None
+    expected_authorization = None
+
+    def log_message(self, _format, *_args):
+        pass
+
+    def do_GET(self):
+        self._git_backend()
+
+    def do_POST(self):
+        self._git_backend()
+
+    def _git_backend(self):
+        if self.headers.get("Authorization") != self.expected_authorization:
+            self.send_response(401)
+            self.send_header("WWW-Authenticate", 'Basic realm="test"')
+            self.end_headers()
+            return
+        parsed = urlsplit(self.path)
+        length = int(self.headers.get("Content-Length", "0"))
+        request_body = self.rfile.read(length) if length else b""
+        backend_env = os.environ.copy()
+        backend_env.update({
+            "GIT_PROJECT_ROOT": str(self.project_root),
+            "GIT_HTTP_EXPORT_ALL": "1",
+            "PATH_INFO": parsed.path,
+            "QUERY_STRING": parsed.query,
+            "REQUEST_METHOD": self.command,
+            "CONTENT_TYPE": self.headers.get("Content-Type", ""),
+            "CONTENT_LENGTH": str(length),
+            "REMOTE_USER": "ci-bot",
+            "REMOTE_ADDR": "::1",
+            "GATEWAY_INTERFACE": "CGI/1.1",
+            "SERVER_PROTOCOL": "HTTP/1.1",
+        })
+        result = subprocess.run(
+            ["git", "http-backend"], input=request_body, env=backend_env,
+            capture_output=True, check=True,
+        )
+        raw_headers, response_body = result.stdout.split(b"\r\n\r\n", 1)
+        headers, status = [], 200
+        for line in raw_headers.decode().split("\r\n"):
+            name, value = line.split(":", 1)
+            if name.lower() == "status":
+                status = int(value.strip().split(" ", 1)[0])
+            else:
+                headers.append((name, value.strip()))
+        self.send_response(status)
+        for name, value in headers:
+            self.send_header(name, value)
+        self.end_headers()
+        self.wfile.write(response_body)
+
+
+class ConfigContractTests(unittest.TestCase):
+    def setUp(self):
+        self.raw = fixture("split-site.yaml")
+
+    def assert_invalid(self, mutate, message):
+        raw = copy.deepcopy(self.raw)
+        mutate(raw)
+        with self.assertRaisesRegex(ConfigError, message):
+            normalize_site_config(raw, "baseline.fritzlab.net")
+
+    def test_legacy_normalizes_to_explicit_compatibility_surface(self):
+        cfg = normalize_site_config(fixture("legacy-site.yaml"), "example.fritzlab.net")
+        self.assertEqual("single-surface-v1", cfg["compatibility"])
+        self.assertEqual("build/html", cfg["artifacts"][0]["build_dir"])
+        self.assertEqual("example.fritzlab.net", cfg["artifacts"][0]["bucket"])
+        self.assertEqual("/", cfg["routes"][0]["path"])
+        self.assertEqual("legacy", cfg["routes"][0]["access"])
+
+    def test_routes_are_sorted_longest_prefix_first(self):
+        cfg = normalize_site_config(self.raw, "baseline.fritzlab.net")
+        self.assertEqual(["/dist", "/"], [route["path"] for route in cfg["routes"]])
+        credentials = {artifact["name"]: artifact["credentials"] for artifact in cfg["artifacts"]}
+        self.assertNotEqual(credentials["distributions"], credentials["portal"])
+
+    def test_equivalent_route_paths_are_ambiguous(self):
+        self.assert_invalid(lambda raw: raw["routes"].append({
+            "name": "duplicate", "path": "/dist/", "artifact": "portal",
+            "access": {"mode": "protected", "middleware": "authentik-forwardauth"},
+        }), "ambiguous")
+
+    def test_catch_all_is_required(self):
+        self.assert_invalid(lambda raw: raw["routes"].__setitem__(0, {
+            **raw["routes"][0], "path": "/portal"
+        }), "catch-all")
+
+    def test_public_catch_all_is_rejected_when_any_route_is_protected(self):
+        def mutate(raw):
+            raw["routes"][0]["access"] = {"mode": "public"}
+            raw["routes"][1]["access"] = {
+                "mode": "protected", "middleware": "authentik-forwardauth"
+            }
+            raw["artifacts"][0]["cache"]["rules"][0]["cache_control"] = (
+                "public, max-age=0, must-revalidate"
+            )
+            for rule in raw["artifacts"][1]["cache"]["rules"]:
+                rule["cache_control"] = "private, no-store"
+        self.assert_invalid(mutate, "public '/' catch-all")
+
+    def test_protected_route_requires_middleware(self):
+        self.assert_invalid(
+            lambda raw: raw["routes"][0].__setitem__("access", {"mode": "protected"}),
+            "middleware is required",
+        )
+
+    def test_bucket_cannot_cross_access_boundary(self):
+        self.assert_invalid(
+            lambda raw: raw["artifacts"][0]["publish"].__setitem__("bucket", "baseline-dist"),
+            "protected and public",
+        )
+
+    def test_publication_credentials_cannot_be_reused(self):
+        def mutate(raw):
+            raw["artifacts"][0]["publish"]["credentials"] = copy.deepcopy(
+                raw["artifacts"][1]["publish"]["credentials"]
+            )
+        self.assert_invalid(mutate, "publication credential DIST_S3_ACCESS_KEY is reused")
+
+    def test_cache_directive_contradiction_is_rejected(self):
+        self.assert_invalid(
+            lambda raw: raw["artifacts"][1]["cache"]["rules"][1].__setitem__(
+                "cache_control", "public, max-age=31536000, immutable, must-revalidate"
+            ),
+            "immutable requires",
+        )
+
+    def test_cache_policy_cannot_nest_below_immutable_path(self):
+        def mutate(raw):
+            raw["artifacts"][1]["cache"]["rules"].append({
+                "path": "releases/candidates",
+                "cache_control": "public, max-age=0, must-revalidate",
+            })
+        self.assert_invalid(mutate, "cannot nest another policy under immutable /releases")
+
+    def test_public_cache_is_rejected_on_protected_route(self):
+        self.assert_invalid(
+            lambda raw: raw["artifacts"][0]["cache"]["rules"][0].__setitem__(
+                "cache_control", "public, max-age=0, must-revalidate"
+            ),
+            "protected route portal",
+        )
+
+    def test_legacy_and_split_fields_cannot_mix(self):
+        self.assert_invalid(lambda raw: raw.__setitem__("type", "static"), "cannot be mixed")
+
+    def test_unknown_split_field_is_rejected(self):
+        self.assert_invalid(
+            lambda raw: raw["artifacts"][0].__setitem__("storage_bucket", "typo"),
+            "unknown fields: storage_bucket",
+        )
+
+    def test_backend_authority_and_endpoint_are_derived(self):
+        for field, value in (
+            ("endpoint", "https://attacker.example"),
+            ("website_authority", "internal-api.default.svc.k8s.sjc001.fritzlab.net"),
+        ):
+            with self.subTest(field=field):
+                self.assert_invalid(
+                    lambda raw, field=field, value=value: raw["artifacts"][0]["publish"].__setitem__(field, value),
+                    f"unknown fields: {field}",
+                )
+
+    def test_publication_credentials_use_dedicated_matched_names(self):
+        self.assert_invalid(
+            lambda raw: raw["artifacts"][0]["publish"]["credentials"].__setitem__(
+                "access_key_env", "CI_BOT_TOKEN"
+            ),
+            "must be a matched <NAME>_S3_ACCESS_KEY",
+        )
+
+    def test_resolved_build_inputs_must_be_pairwise_disjoint(self):
+        raw = copy.deepcopy(self.raw)
+        raw["artifacts"][1]["content_dir"] = ""
+        cfg = normalize_site_config(raw, "baseline.fritzlab.net")
+        with tempfile.TemporaryDirectory() as tmp:
+            root = Path(tmp)
+            (root / "portal" / "build").mkdir(parents=True)
+            with self.assertRaisesRegex(ConfigError, "build inputs overlap after resolution"):
+                validate_artifact_inputs(root, cfg)
+
+    def test_descendant_symlink_cannot_cross_artifact_boundary(self):
+        cfg = normalize_site_config(self.raw, "baseline.fritzlab.net")
+        with tempfile.TemporaryDirectory() as tmp:
+            root = Path(tmp)
+            (root / "dist").mkdir()
+            (root / "portal" / "build").mkdir(parents=True)
+            (root / "portal" / "build" / "private.txt").write_text("private")
+            (root / "dist" / "portal-link").symlink_to(root / "portal" / "build")
+            with self.assertRaisesRegex(ConfigError, "build input contains symlink"):
+                validate_artifact_inputs(root, cfg)
+
+    def test_artifact_root_symlink_is_rejected_before_resolution(self):
+        cfg = normalize_site_config(self.raw, "baseline.fritzlab.net")
+        with tempfile.TemporaryDirectory() as tmp:
+            root = Path(tmp)
+            (root / "dist-real").mkdir()
+            (root / "dist").symlink_to(root / "dist-real")
+            (root / "portal" / "build").mkdir(parents=True)
+            with self.assertRaisesRegex(ConfigError, "content_dir contains symlink component"):
+                validate_artifact_inputs(root, cfg)
+
+
+class GenerationTests(unittest.TestCase):
+    def render(self, raw):
+        cfg = normalize_site_config(raw, "baseline.fritzlab.net")
+        tmp = tempfile.TemporaryDirectory()
+        root = Path(tmp.name)
+        app_dir = root / "app"
+        manifests = app_dir / "manifests"
+        app_dir.mkdir(parents=True)
+        deploy.render_site_manifests(
+            "baseline.fritzlab.net", ROOT, app_dir, manifests, cfg
+        )
+        files = {path.relative_to(app_dir).as_posix(): path.read_text()
+                 for path in sorted(app_dir.rglob("*.yaml"))}
+        return tmp, app_dir, files
+
+    def test_split_fixture_generates_per_route_resources_and_one_certificate(self):
+        tmp, _, files = self.render(fixture("split-site.yaml"))
+        self.addCleanup(tmp.cleanup)
+        self.assertEqual({
+            "app.yaml", "manifests/certificate.yaml", "manifests/ingress-distributions.yaml",
+            "manifests/ingress-portal.yaml", "manifests/kustomization.yaml",
+            "manifests/service-distributions.yaml", "manifests/service-portal.yaml",
+        }, set(files))
+        for content in files.values():
+            self.assertIsNotNone(yaml.safe_load(content))
+        self.assertIn("path: /dist", files["manifests/ingress-distributions.yaml"])
+        self.assertNotIn("authentik-forwardauth", files["manifests/ingress-distributions.yaml"])
+        self.assertIn("authentik-forwardauth@file", files["manifests/ingress-portal.yaml"])
+        self.assertIn('service.passhostheader: "false"', files["manifests/service-portal.yaml"])
+        self.assertNotIn("passhostheader", files["manifests/ingress-portal.yaml"])
+        self.assertIn("baseline-dist.web.sjc001.fritzlab.net", files["manifests/service-distributions.yaml"])
+
+    def test_history_keeps_yaml_ambiguous_artifact_names_as_strings(self):
+        raw = fixture("split-site.yaml")
+        raw["artifacts"][0]["name"] = "yes"
+        raw["routes"][0]["artifact"] = "yes"
+        cfg = normalize_site_config(raw, "baseline.fritzlab.net")
+        contracts = deploy.next_route_contracts(cfg, {})
+        with tempfile.TemporaryDirectory() as tmp:
+            app_dir = Path(tmp)
+            deploy.write_route_contracts(app_dir, contracts)
+            restored = deploy.previous_route_contracts(app_dir)
+        self.assertEqual("yes", restored["baseline-portal"]["artifact"])
+
+    def test_generation_is_deterministic_when_input_lists_are_reversed(self):
+        raw = fixture("split-site.yaml")
+        first_tmp, _, first = self.render(raw)
+        self.addCleanup(first_tmp.cleanup)
+        raw["artifacts"].reverse()
+        raw["routes"].reverse()
+        second_tmp, _, second = self.render(raw)
+        self.addCleanup(second_tmp.cleanup)
+        self.assertEqual(first, second)
+
+    def test_stale_route_manifests_are_removed(self):
+        raw = fixture("split-site.yaml")
+        cfg = normalize_site_config(raw, "baseline.fritzlab.net")
+        with tempfile.TemporaryDirectory() as tmp:
+            app_dir = Path(tmp) / "app"
+            manifests = app_dir / "manifests"
+            manifests.mkdir(parents=True)
+            stale = manifests / "ingress-removed.yaml"
+            stale.write_text("stale\n")
+            deploy.render_site_manifests("baseline.fritzlab.net", ROOT, app_dir, manifests, cfg)
+            self.assertFalse(stale.exists())
+
+    def test_legacy_names_and_garage_s3_target_are_preserved(self):
+        tmp, app_dir, files = self.render(fixture("legacy-site.yaml"))
+        self.addCleanup(tmp.cleanup)
+        self.assertIn("manifests/service.yaml", files)
+        self.assertIn("manifests/ingress.yaml", files)
+        self.assertIn("garage-s3.storage.svc.k8s.sjc001.fritzlab.net", files["manifests/service.yaml"])
+        self.assertNotIn("passhostheader", files["manifests/ingress.yaml"])
+        self.assertNotIn("site-publish.fritzlab.net", files["manifests/ingress.yaml"])
+        self.assertEqual({}, deploy.previous_route_contracts(app_dir))
+
+
+class BuildTests(unittest.TestCase):
+    def test_artifacts_build_independently_without_clobbering_siblings(self):
+        raw = fixture("split-site.yaml")
+        for artifact in raw["artifacts"]:
+            artifact["tidy"] = False
+        cfg = normalize_site_config(raw, "baseline.fritzlab.net")
+        with tempfile.TemporaryDirectory() as tmp:
+            root = Path(tmp)
+            (root / "dist").mkdir()
+            (root / "dist" / "bundle.js").write_text("bundle")
+            (root / "portal" / "build").mkdir(parents=True)
+            (root / "portal" / "build" / "index.html").write_text("portal")
+            for artifact in cfg["artifacts"]:
+                build.build_artifact(root, artifact)
+            self.assertEqual(
+                "bundle", (root / ".site-publish/distributions/html/bundle.js").read_text()
+            )
+            self.assertEqual(
+                "portal", (root / ".site-publish/portal/html/index.html").read_text()
+            )
+
+
+class PublishingTests(unittest.TestCase):
+    def test_apps_clone_never_places_token_in_argv_or_log(self):
+        calls = []
+        secret = "clone-secret-must-not-appear"
+        with patch.dict(os.environ, {"CI_BOT_USER": "ci-bot"}, clear=False), \
+                patch.object(utils, "run", side_effect=lambda command, **kwargs: calls.append((command, kwargs))), \
+                patch.object(utils.shutil, "rmtree"), redirect_stdout(io.StringIO()) as output:
+            utils.clone_apps(secret)
+        self.assertNotIn(secret, output.getvalue())
+        for command, kwargs in calls:
+            self.assertNotIn(secret, " ".join(command))
+            self.assertNotIn(secret, kwargs.get("display", ""))
+
+    def test_askpass_authenticates_clone_and_push_round_trip(self):
+        token = "round-trip-token"
+        expected = "Basic " + base64.b64encode(f"ci-bot:{token}".encode()).decode()
+        with tempfile.TemporaryDirectory() as tmp:
+            root = Path(tmp)
+            bare = root / "repo.git"
+            seed = root / "seed"
+            checkout = root / "checkout"
+            subprocess.run(["git", "init", "--bare", "--initial-branch=main", str(bare)], check=True,
+                           stdout=subprocess.DEVNULL)
+            subprocess.run(["git", "-C", str(bare), "config", "http.receivepack", "true"], check=True)
+            subprocess.run(["git", "init", "--initial-branch=main", str(seed)], check=True,
+                           stdout=subprocess.DEVNULL)
+            subprocess.run(["git", "-C", str(seed), "config", "user.name", "Test"], check=True)
+            subprocess.run(["git", "-C", str(seed), "config", "user.email", "test@example.invalid"], check=True)
+            (seed / "README.md").write_text("seed\n")
+            subprocess.run(["git", "-C", str(seed), "add", "README.md"], check=True)
+            subprocess.run(["git", "-C", str(seed), "commit", "-m", "seed"], check=True,
+                           stdout=subprocess.DEVNULL)
+            subprocess.run(["git", "-C", str(seed), "push", str(bare), "main"], check=True,
+                           stdout=subprocess.DEVNULL)
+
+            handler = type("GitHandler", (AuthenticatedGitHandler,), {
+                "project_root": root, "expected_authorization": expected,
+            })
+            server = IPv6GitHTTPServer(("::1", 0), handler)
+            thread = threading.Thread(target=server.serve_forever, daemon=True)
+            thread.start()
+            try:
+                url = f"http://ci-bot@[::1]:{server.server_port}/repo.git"
+                with patch.dict(os.environ, {"NO_PROXY": "::1,[::1]", "no_proxy": "::1,[::1]"}, clear=False):
+                    subprocess.run(
+                        ["git", "clone", url, str(checkout)], env=utils.git_auth_env(token),
+                        check=True, stdout=subprocess.DEVNULL, stderr=subprocess.DEVNULL,
+                    )
+                    subprocess.run(["git", "-C", str(checkout), "config", "user.name", "Test"], check=True)
+                    subprocess.run(["git", "-C", str(checkout), "config", "user.email", "test@example.invalid"],
+                                   check=True)
+                    (checkout / "roundtrip.txt").write_text("authenticated\n")
+                    utils.commit_and_push(checkout, "authenticated round trip", token)
+            finally:
+                server.shutdown()
+                server.server_close()
+                thread.join(timeout=5)
+            result = subprocess.run(
+                ["git", "--git-dir", str(bare), "show", "main:roundtrip.txt"],
+                check=True, text=True, capture_output=True,
+            )
+            self.assertEqual("authenticated\n", result.stdout)
+
+    def test_cache_headers_credentials_and_route_prefix_are_separate(self):
+        cfg = normalize_site_config(fixture("split-site.yaml"), "baseline.fritzlab.net")
+        artifact = next(item for item in cfg["artifacts"] if item["name"] == "distributions")
+        route = next(item for item in cfg["routes"] if item["artifact"] == "distributions")
+        with tempfile.TemporaryDirectory() as tmp:
+            root = Path(tmp)
+            html = root / artifact["build_dir"]
+            (html / "releases").mkdir(parents=True)
+            (html / "channels").mkdir()
+            (html / "releases" / "1.0.js").write_text("release")
+            (html / "channels" / "stable.json").write_text("channel")
+            commands, events = [], []
+
+            def capture(command, **kwargs):
+                commands.append((command, kwargs["env"]))
+                events.append("mutable")
+
+            def publish_immutable(*_args):
+                events.append("immutable")
+
+            secret = "secret-must-not-appear"
+            output = io.StringIO()
+            with patch.dict(os.environ, {
+                "DIST_S3_ACCESS_KEY": "dist-key", "DIST_S3_SECRET_KEY": secret
+            }, clear=False), patch.object(deploy, "run", side_effect=capture), \
+                    patch.object(deploy, "publish_immutable_rule", side_effect=publish_immutable) as immutable_publish, \
+                    redirect_stdout(output):
+                deploy.publish_route_immutables(artifact, route, root)
+                deploy.s3_sync(artifact, route, root)
+
+            self.assertTrue(all(secret not in " ".join(command) for command, _ in commands))
+            self.assertEqual("immutable", events[0])
+            self.assertNotIn(secret, output.getvalue())
+            self.assertTrue(all(call_env["AWS_ACCESS_KEY_ID"] == "dist-key" for _, call_env in commands))
+            self.assertTrue(all("DIST_S3_SECRET_KEY" not in call_env for _, call_env in commands))
+            rendered = [" ".join(command) for command, _ in commands]
+            self.assertIn("s3://baseline-dist/dist/", rendered[0])
+            self.assertIn("releases/*", rendered[0])
+            self.assertNotIn("--delete", rendered[0])
+            self.assertIn("--delete", rendered[1])
+            self.assertTrue(all("s3://baseline-dist/dist/" in command for command in rendered[1:]))
+            self.assertTrue(any("channels/" in command and
+                                "public, max-age=0, must-revalidate" in command
+                                for command in rendered))
+            immutable_publish.assert_called_once()
+            self.assertEqual(
+                "public, max-age=31536000, immutable",
+                immutable_publish.call_args.args[2]["cache_control"],
+            )
+
+    def test_root_move_preserves_only_actual_retired_immutable_prefix(self):
+        cfg = normalize_site_config(fixture("split-site.yaml"), "baseline.fritzlab.net")
+        artifact = next(item for item in cfg["artifacts"] if item["name"] == "distributions")
+        route = {**next(item for item in cfg["routes"] if item["artifact"] == "distributions"),
+                 "path": "/"}
+        with tempfile.TemporaryDirectory() as tmp:
+            root = Path(tmp)
+            html = root / artifact["build_dir"]
+            (html / "releases").mkdir(parents=True)
+            (html / "channels").mkdir()
+            (html / "docs" / "releases").mkdir(parents=True)
+            (html / "channels" / "stable.json").write_text("channel")
+            (html / "docs" / "releases" / "index.html").write_text("mutable")
+            commands = []
+            with patch.dict(os.environ, {
+                "DIST_S3_ACCESS_KEY": "dist-key", "DIST_S3_SECRET_KEY": "dist-secret"
+            }, clear=False), patch.object(
+                deploy, "run", side_effect=lambda command, **_: commands.append(command)
+            ):
+                deploy.s3_sync(artifact, route, root, previous_contract={
+                    "path": "/foo", "access": "public", "artifact": "distributions",
+                    "immutable_prefixes": ["foo/releases"],
+                })
+            rendered = [" ".join(command) for command in commands]
+            self.assertTrue(all("foo/releases/*" in command for command in rendered[:2]))
+            self.assertTrue(all("*/releases/*" not in command for command in rendered))
+
+    def test_protected_bucket_cannot_become_public_across_deployments(self):
+        cfg = normalize_site_config(fixture("split-site.yaml"), "baseline.fritzlab.net")
+        previous = {
+            "baseline-dist": {
+                "path": "/dist", "access": "protected", "artifact": "old-name",
+                "immutable_prefixes": ["dist/releases"],
+            }
+        }
+        with self.assertRaisesRegex(RuntimeError, "cannot become public while reusing protected"):
+            deploy.validate_route_migrations(cfg, previous)
+        renamed = copy.deepcopy(cfg)
+        artifact = next(item for item in renamed["artifacts"] if item["name"] == "distributions")
+        artifact["name"] = "downloads"
+        route = next(item for item in renamed["routes"] if item["artifact"] == "distributions")
+        route["artifact"] = "downloads"
+        with self.assertRaisesRegex(RuntimeError, "cannot become public while reusing protected"):
+            deploy.validate_route_migrations(renamed, previous)
+        previous = {"retired-protected-bucket": previous["baseline-dist"]}
+        deploy.validate_route_migrations(cfg, previous)
+
+    def test_protected_split_bucket_cannot_become_legacy_public(self):
+        cfg = normalize_site_config(fixture("legacy-site.yaml"), "baseline.fritzlab.net")
+        previous = {
+            "baseline.fritzlab.net": {
+                "path": "/portal", "access": "protected", "artifact": "portal",
+                "immutable_prefixes": [],
+            }
+        }
+        with self.assertRaisesRegex(RuntimeError, "cannot become public while reusing protected"):
+            deploy.validate_route_migrations(cfg, previous)
+
+    def test_removed_immutable_rule_preserves_prior_keys(self):
+        cfg = normalize_site_config(fixture("split-site.yaml"), "baseline.fritzlab.net")
+        artifact = next(item for item in cfg["artifacts"] if item["name"] == "distributions")
+        artifact["cache_rules"] = [
+            rule for rule in artifact["cache_rules"] if rule["path"] != "releases"
+        ]
+        route = next(item for item in cfg["routes"] if item["artifact"] == "distributions")
+        with tempfile.TemporaryDirectory() as tmp:
+            html = Path(tmp)
+            filters = deploy.retired_immutable_filters(artifact, route, html, {
+                "path": "/dist", "access": "public", "artifact": "distributions",
+                "immutable_prefixes": ["dist/releases"],
+            })
+            self.assertEqual(["--exclude", "releases/*"], filters)
+            previous = {
+                "baseline-dist": {
+                    "path": "/dist", "access": "public", "artifact": "distributions",
+                    "immutable_prefixes": ["dist/releases"],
+                }
+            }
+            next_contracts = deploy.next_route_contracts(cfg, previous)
+            self.assertEqual(
+                ["dist/releases"], next_contracts["baseline-dist"]["immutable_prefixes"],
+            )
+            self.assertEqual(
+                ["--exclude", "releases/*"],
+                deploy.retired_immutable_filters(
+                    artifact, route, html, next_contracts["baseline-dist"],
+                ),
+            )
+            (html / "releases").mkdir()
+            (html / "releases" / "replacement.js").write_text("mutable")
+            with self.assertRaisesRegex(RuntimeError, "collides with retired immutable"):
+                deploy.retired_immutable_filters(artifact, route, html, {
+                    "path": "/dist", "access": "public", "artifact": "distributions",
+                    "immutable_prefixes": ["dist/releases"],
+                })
+
+    def test_removed_route_history_remains_append_only(self):
+        cfg = normalize_site_config(fixture("split-site.yaml"), "baseline.fritzlab.net")
+        previous = {
+            "retired-bucket": {
+                "path": "/retired", "access": "protected", "artifact": "retired",
+                "immutable_prefixes": ["retired/releases"],
+            }
+        }
+        contracts = deploy.next_route_contracts(cfg, previous)
+        self.assertEqual(previous["retired-bucket"], contracts["retired-bucket"])
+
+    def test_decommission_preserves_history_for_an_unpurged_bucket(self):
+        with tempfile.TemporaryDirectory() as tmp:
+            apps = Path(tmp)
+            site = apps / "sjc001/websites/baseline"
+            site.mkdir(parents=True)
+            history = b'{"schemaVersion":1,"buckets":{}}\n'
+            (site / deploy.HISTORY_FILE).write_bytes(history)
+            (site / "app.yaml").write_text("live\n")
+            with patch.object(deploy, "clone_apps", return_value=apps), patch.object(
+                deploy, "commit_and_push"
+            ) as commit:
+                deploy.decommission("baseline", "token", ["baseline-dist"])
+            self.assertEqual(history, (site / deploy.HISTORY_FILE).read_bytes())
+            self.assertFalse((site / "app.yaml").exists())
+            commit.assert_called_once_with(apps, "Decommission baseline", "token")
+
+    def test_later_route_immutable_failure_stops_all_mutable_publication(self):
+        cfg = normalize_site_config(fixture("split-site.yaml"), "baseline.fritzlab.net")
+        with tempfile.TemporaryDirectory() as tmp:
+            root = Path(tmp)
+            with patch.object(deploy, "validate_publication_environment"), \
+                    patch.object(deploy, "validate_artifact_output"), \
+                    patch.object(deploy, "clone_apps", return_value=root / "apps"), patch.object(
+                        deploy, "publish_route_immutables",
+                        side_effect=[None, RuntimeError("immutable failed")],
+                    ) as immutable_publish, patch.object(deploy, "s3_sync") as mutable_sync, \
+                    self.assertRaisesRegex(
+                RuntimeError, "immutable failed"
+            ):
+                deploy.deploy_static("baseline", root, root, "token", cfg)
+
+            self.assertEqual(2, immutable_publish.call_count)
+            mutable_sync.assert_not_called()
+
+
+    def test_absent_artifact_is_detected_before_publish(self):
+        cfg = normalize_site_config(fixture("split-site.yaml"), "baseline.fritzlab.net")
+        with tempfile.TemporaryDirectory() as tmp, redirect_stderr(io.StringIO()), \
+                self.assertRaises(SystemExit):
+            deploy.validate_artifact_output(Path(tmp), cfg["artifacts"][0])
+
+    def test_absent_cache_prefix_is_detected(self):
+        cfg = normalize_site_config(fixture("split-site.yaml"), "baseline.fritzlab.net")
+        artifact = next(item for item in cfg["artifacts"] if item["name"] == "distributions")
+        with tempfile.TemporaryDirectory() as tmp:
+            html = Path(tmp) / artifact["build_dir"]
+            html.mkdir(parents=True)
+            (html / "index.html").write_text("content")
+            with redirect_stderr(io.StringIO()), self.assertRaises(SystemExit):
+                deploy.validate_artifact_output(Path(tmp), artifact)
+
+
+class ImmutablePublicationTests(unittest.TestCase):
+    CACHE = "public, max-age=31536000, immutable"
+
+    def result(self, returncode, stdout="", stderr=""):
+        return subprocess.CompletedProcess([], returncode, stdout, stderr)
+
+    def key_and_digests(self, source):
+        content_type = "text/javascript"
+        content_digest, publication_digest = deploy._immutable_digests(
+            source, self.CACHE, content_type,
+        )
+        return f"dist/releases/release-{publication_digest}.js", content_digest, publication_digest
+
+    def test_new_key_uses_content_address_and_digest_metadata(self):
+        with tempfile.TemporaryDirectory() as tmp:
+            source = Path(tmp) / "release.js"
+            source.write_text("fixed release")
+            key, content_digest, publication_digest = self.key_and_digests(source)
+            calls = []
+
+            def capture(args, _env):
+                calls.append(args)
+                return self.result(1, stderr="404 Not Found") if len(calls) == 1 else self.result(0, "{}")
+
+            with patch.object(deploy, "_aws_capture", side_effect=capture):
+                created = deploy.publish_immutable_file(
+                    "http://garage-s3.storage.svc:3900", "dist-bucket",
+                    key, source, self.CACHE, {},
+                )
+            self.assertTrue(created)
+            put = calls[1]
+            self.assertEqual("put-object", put[4])
+            self.assertNotIn("--if-none-match", put)
+            self.assertEqual(
+                f"sha256={content_digest},publication-sha256={publication_digest}",
+                put[put.index("--metadata") + 1],
+            )
+
+    def test_identical_retry_converges_without_put(self):
+        with tempfile.TemporaryDirectory() as tmp:
+            source = Path(tmp) / "release.js"
+            source.write_text("fixed release")
+            key, content_digest, publication_digest = self.key_and_digests(source)
+            head = json.dumps({
+                "Metadata": {"sha256": content_digest, "publication-sha256": publication_digest},
+                "CacheControl": self.CACHE,
+                "ContentType": "text/javascript",
+            })
+            with patch.object(deploy, "_aws_capture", return_value=self.result(0, head)) as request:
+                created = deploy.publish_immutable_file(
+                    "http://garage-s3.storage.svc:3900", "dist-bucket",
+                    key, source, self.CACHE, {},
+                )
+            self.assertFalse(created)
+            self.assertEqual(1, request.call_count)
+
+    def test_changed_immutable_key_is_refused(self):
+        with tempfile.TemporaryDirectory() as tmp:
+            source = Path(tmp) / "release.js"
+            source.write_text("changed release")
+            key, _, _ = self.key_and_digests(source)
+            head = json.dumps({"Metadata": {"sha256": "different"}, "CacheControl": self.CACHE})
+            with patch.object(deploy, "_aws_capture", return_value=self.result(0, head)), \
+                    self.assertRaisesRegex(RuntimeError, "immutable object differs"):
+                deploy.publish_immutable_file(
+                    "http://garage-s3.storage.svc:3900", "dist-bucket",
+                    key, source, self.CACHE, {},
+                )
+
+    def test_immutable_key_without_publication_digest_is_refused_before_s3(self):
+        with tempfile.TemporaryDirectory() as tmp:
+            source = Path(tmp) / "release.js"
+            source.write_text("fixed release")
+            with patch.object(deploy, "_aws_capture") as request, \
+                    self.assertRaisesRegex(RuntimeError, "must contain its one publication SHA-256"):
+                deploy.publish_immutable_file(
+                    "http://garage-s3.storage.svc:3900", "dist-bucket",
+                    "dist/releases/release.js", source, self.CACHE, {},
+                )
+            request.assert_not_called()
+
+
+if __name__ == "__main__":
+    unittest.main()