feat: add secure Covencat autoreview and repair loop

.gitignore

@@ -9,3 +9,4 @@ keys/
 coven-github-policy.json
 coven-github-state/
 .coven-github-private-key.pem
+deploy/artifacts/

README.md

@@ -64,10 +64,15 @@ The deployment expects secrets and mutable state to be supplied outside git:
 - `COVEN_CODE_BIN` - absolute coven-code path inside that rootfs
 - `COVEN_RUNTIME_NETWORK=shared` - explicit opt-in required when the Codex
   provider needs network access; the default is `none`
-- `COVEN_REVIEW_FIX_LOOPS` - optional bounded review-fix loop count, clamped
-  between `0` and `5`; defaults to `0` so hosted repair loops are opt-in
+- Automatic review and repair are repository-policy controls, not ambient
+  environment switches. `autoreview.enabled` and `repair.enabled` must each be
+  opted into explicitly; `kill_switch` stops new routing and repair pushes.
 - Codex OAuth tokens under the deployed account's `.coven-code` directory
 
+The host refreshes an expiring Codex OAuth session through the fixed OpenAI
+token endpoint and atomically updates the private token file. Only the resulting
+short-lived access token enters the model sandbox; the refresh token never does.
+
 Do not commit private keys, webhook secrets, OAuth tokens, generated task state,
 workspaces, or attempt artifacts.
 
@@ -82,7 +87,9 @@ records the task as `runtime_isolation_unavailable` with no direct fallback.
 The runtime rootfs must contain the configured `coven-code`, `git`, and shell
 executables plus their libraries, CA/DNS files, and approved runtime assets. It
 must not contain the GitHub App key, webhook state, policy, parent home, or Codex
-token store. The runtime receives only its dedicated model credential; it never
+token store. The private PID namespace receives an empty `/proc`, avoiding host
+procfs exposure and nested procfs-mount authority. The runtime receives only its
+dedicated model credential; it never
 receives a GitHub token or Git askpass helper. Shared networking is not an
 egress-confidentiality boundary, so use a dedicated, revocable model credential
 and an externally enforced allowlist that blocks loopback, LAN, and metadata
@@ -185,7 +192,9 @@ connection guide in
   sandbox.
 - Uses repository-scoped installation tokens: parent Git gets only
   `contents:read`, PR evidence gets read authority, and publication write
-  authority is minted only after isolated execution has finished.
+  authority is minted only after isolated execution has finished. An opted-in
+  repair mints a separate short-lived token with only `contents:write` and
+  `pull_requests:read`; the model never receives it.
 - Persists `publication_pending` before GitHub writes and resumes interrupted
   publication on startup or duplicate webhook delivery without rerunning the
   agent.
@@ -198,6 +207,12 @@ connection guide in
 - Publishes non-PR task results and operational notices as issue comments,
   including structured `reviewed_files`, `supporting_files`, findings, test
   evidence, no-findings rationale, and limitations.
-- When `COVEN_REVIEW_FIX_LOOPS` is greater than `0`, reruns `coven-code` with
-  prior structured review findings as explicit repair instructions until no
-  findings remain or the configured loop count is exhausted.
+- With explicit `autoreview.enabled`, routes opened, ready-for-review, reopened,
+  and synchronized pull-request revisions by repository, PR number, and exact
+  head SHA. Drafts remain excluded unless `include_drafts` is enabled.
+- With separate `repair.enabled`, an evidence-complete REQUEST_CHANGES review
+  may launch a file-write-only hosted repair. The trusted host rejects forks,
+  protected branches and paths, oversized or unrelated diffs, stale heads, and
+  failed validation; it then creates a Covencat-attributed non-force commit and
+  queues a fresh review of the new SHA. The loop stops after the configured
+  `max_attempts` (clamped to 1-3) or on repeated findings or non-progress.

config/example-policy.json

@@ -8,6 +8,8 @@
             "issues.labeled",
             "issue_comment.created",
             "pull_request_review_comment.created",
+            "pull_request.opened",
+            "pull_request.ready_for_review",
             "pull_request.synchronize",
             "pull_request.edited",
             "pull_request.reopened",
@@ -31,8 +33,36 @@
             ]
           },
           "publication": {
-            "mode": "record_only"
-          }
+            "mode": "record_only",
+            "validation_commands": [
+              "npm test"
+            ],
+            "validation_timeout_seconds": 300
+          },
+          "autoreview": {
+            "enabled": false,
+            "include_drafts": false
+          },
+          "repair": {
+            "enabled": false,
+            "max_attempts": 2,
+            "max_changed_files": 8,
+            "max_diff_bytes": 262144,
+            "allowed_paths": [
+              "src/**",
+              "tests/**"
+            ],
+            "protected_branches": [
+              "release/**"
+            ]
+          },
+          "protected_paths": [
+            ".github/**",
+            "CODEOWNERS",
+            "**/CODEOWNERS"
+          ],
+          "kill_switch": false,
+          "enabled": true
         }
       }
     }

deploy/Containerfile

@@ -0,0 +1,75 @@
+ARG NODE_IMAGE=docker.io/library/node@sha256:242549cd46785b480c832479a730f4f2a20865d61ea2e404fdb2a5c3d3b73ecf
+
+FROM ${NODE_IMAGE} AS egress
+ARG COVEN_BUILD_EGRESS_HOSTS="github.com api.github.com chatgpt.com auth.openai.com"
+ENV COVEN_BUILD_EGRESS_HOSTS=${COVEN_BUILD_EGRESS_HOSTS}
+COPY deploy/resolve-egress.mjs /resolve-egress.mjs
+RUN node /resolve-egress.mjs
+
+FROM ${NODE_IMAGE} AS build
+WORKDIR /src
+COPY package.json package-lock.json ./
+RUN npm ci
+COPY tsconfig.json ./
+COPY src ./src
+RUN npm run build && npm prune --omit=dev
+
+FROM ${NODE_IMAGE} AS sandbox-rootfs
+RUN apt-get update \
+ && apt-get install -y --no-install-recommends ca-certificates git libasound2 \
+ && rm -rf /var/lib/apt/lists/*
+COPY --from=egress /out/hosts /etc/hosts
+COPY deploy/artifacts/coven-code /usr/local/bin/coven-code
+RUN chmod 0755 /usr/local/bin/coven-code \
+ && mkdir -p /workspace \
+ && test -x /usr/bin/git \
+ && test -x /bin/sh \
+ && test -x /bin/true
+
+FROM ${NODE_IMAGE} AS runtime
+ARG WEBHOOK_REVISION
+ARG COVEN_CODE_REVISION
+ARG COVEN_CODE_BINARY_SHA256
+LABEL org.opencontainers.image.revision=${WEBHOOK_REVISION}
+LABEL tech.complete.coven-code.revision=${COVEN_CODE_REVISION}
+LABEL tech.complete.coven-code.binary-sha256=${COVEN_CODE_BINARY_SHA256}
+RUN apt-get update \
+ && apt-get install -y --no-install-recommends bubblewrap ca-certificates git nftables tini util-linux \
+ && rm -rf /var/lib/apt/lists/*
+COPY --from=egress /out/hosts /etc/hosts
+COPY --from=egress /out/egress-ipv4.txt /usr/share/coven/egress-ipv4.txt
+COPY --from=egress /out/egress-hosts.txt /usr/share/coven/egress-hosts.txt
+COPY deploy/probe-runtime.mjs /usr/share/coven/probe-runtime.mjs
+COPY deploy/verify-github-app.mjs /usr/share/coven/verify-github-app.mjs
+COPY --from=sandbox-rootfs / /opt/coven-runtime/rootfs
+COPY --from=build /src/dist /app/dist
+COPY --from=build /src/node_modules /app/node_modules
+COPY package.json package-lock.json /app/
+COPY deploy/worker-entrypoint.sh /usr/local/bin/coven-worker-entrypoint
+RUN chmod 0755 /usr/local/bin/coven-worker-entrypoint \
+ && mkdir -p /var/lib/coven /run/coven-config /home/coven-service \
+ && chown 1000:1000 /var/lib/coven /home/coven-service \
+ && chmod 0700 /var/lib/coven /home/coven-service \
+ && chmod 0755 /run/coven-config
+WORKDIR /app
+ENV NODE_ENV=production \
+    HOME=/home/coven-service \
+    PORT=3000 \
+    COVEN_GITHUB_STATE_DIR=/var/lib/coven \
+    COVEN_GITHUB_POLICY_PATH=/run/coven-config/policy.json \
+    GITHUB_APP_PRIVATE_KEY_PATH=/run/coven-config/github-app.pem \
+    COVEN_CODE_CODEX_TOKENS_PATH=/run/coven-config/codex/codex_tokens.json \
+    COVEN_RUNTIME_ISOLATION=bwrap \
+    COVEN_RUNTIME_EXTERNAL_ISOLATION=network-egress-and-resource-limits-verified \
+    COVEN_GITHUB_REVOCATION_EVENTS=pull-request-and-push-verified \
+    COVEN_BWRAP_BIN=/usr/bin/bwrap \
+    COVEN_RUNTIME_ROOTFS=/opt/coven-runtime/rootfs \
+    COVEN_CODE_BIN=/usr/local/bin/coven-code \
+    COVEN_RUNTIME_GIT_BIN=/usr/bin/git \
+    COVEN_RUNTIME_SHELL_BIN=/bin/sh \
+    COVEN_HOST_GIT_BIN=/usr/bin/git \
+    COVEN_RUNTIME_NETWORK=shared \
+    COVEN_STATE_FILESYSTEM_MAX_BYTES=8589934592
+EXPOSE 3000
+ENTRYPOINT ["/usr/local/bin/coven-worker-entrypoint"]
+CMD ["node", "dist/src/server.js"]

deploy/covencat-ingress-tunnel.service.example

@@ -0,0 +1,21 @@
+[Unit]
+Description=Restricted Covencat ingress tunnel
+After=network-online.target covencat-worker.service
+Wants=network-online.target
+Requires=covencat-worker.service
+
+[Service]
+Type=simple
+ExecStart=/usr/bin/ssh -N -T \
+  -o BatchMode=yes -o IdentitiesOnly=yes -o ExitOnForwardFailure=yes \
+  -o ServerAliveInterval=30 -o ServerAliveCountMax=3 \
+  -o StrictHostKeyChecking=yes \
+  -o UserKnownHostsFile=%h/.ssh/covencat_known_hosts \
+  -i %h/.ssh/covencat_ingress_ed25519 \
+  -R 127.0.0.1:18096:127.0.0.1:3900 \
+  replace-with-ingress-user@replace-with-ingress-host
+Restart=always
+RestartSec=5
+
+[Install]
+WantedBy=default.target

deploy/covencat-state-volume.service.example

@@ -0,0 +1,20 @@
+[Unit]
+Description=Bounded persistent Covencat state filesystem
+After=local-fs.target
+
+[Service]
+Type=simple
+Environment=FUSE2FS_ROOT=%h/.local/opt/fuse2fs
+Environment=STATE_IMAGE=%h/covencat-deploy/state-volume/covencat-state.ext4
+Environment=STATE_MOUNT=%h/covencat-deploy/state-volume/mount
+ExecStartPre=/usr/bin/test -f ${STATE_IMAGE}
+ExecStartPre=/usr/bin/mkdir -p ${STATE_MOUNT}
+ExecStart=/usr/bin/env LD_LIBRARY_PATH=${FUSE2FS_ROOT}/usr/lib/x86_64-linux-gnu:${FUSE2FS_ROOT}/lib/x86_64-linux-gnu ${FUSE2FS_ROOT}/usr/bin/fuse2fs ${STATE_IMAGE} ${STATE_MOUNT} -f -o rw,nosuid,nodev,fakeroot,uid=1000,gid=1000
+ExecStartPost=/usr/bin/chmod 0700 ${STATE_MOUNT}
+ExecStop=/usr/bin/fusermount3 -u ${STATE_MOUNT}
+Restart=on-failure
+RestartSec=5
+TimeoutStopSec=30
+
+[Install]
+WantedBy=default.target

deploy/covencat-worker.service.example

@@ -0,0 +1,38 @@
+[Unit]
+Description=Covencat immutable GitHub review worker
+Requires=covencat-state-volume.service
+After=network-online.target covencat-state-volume.service
+Wants=network-online.target
+
+[Service]
+Environment=IMAGE_DIGEST=replace-with-local-image-digest
+Environment=CONFIG_ROOT=%h/.config/covencat-worker
+Environment=STATE_ROOT=%h/.local/share/covencat-worker
+# STATE_ROOT must be a persistent filesystem of at most 8 GiB. The container
+# independently measures it and refuses startup when it is larger.
+ExecStartPre=/usr/bin/mountpoint -q ${STATE_ROOT}
+ExecStart=/usr/bin/podman run --rm --replace --name covencat-worker \
+  --read-only \
+  --userns=keep-id \
+  --cap-drop=all --cap-add=net_admin --cap-add=setpcap --cap-add=setuid --cap-add=setgid \
+  --security-opt=no-new-privileges \
+  --memory=4g --memory-swap=4g --cpus=2 --pids-limit=256 \
+  --ulimit=nofile=1024:1024 --ulimit=nproc=128:128 \
+  --tmpfs=/tmp:rw,nosuid,nodev,noexec,size=512m \
+  --tmpfs=/run:rw,nosuid,nodev,size=64m \
+  --network=slirp4netns:allow_host_loopback=false --no-hosts \
+  --publish=127.0.0.1:3900:3000 \
+  --env-file=${CONFIG_ROOT}/worker.env \
+  --volume=${CONFIG_ROOT}/policy.json:/run/coven-config/policy.json:ro,Z \
+  --volume=${CONFIG_ROOT}/github-app.pem:/run/coven-config/github-app.pem:ro,Z \
+  --volume=${CONFIG_ROOT}/codex:/run/coven-config/codex:rw,Z \
+  --volume=${STATE_ROOT}:/var/lib/coven:rw,Z \
+  localhost/covencat-worker@${IMAGE_DIGEST}
+ExecStop=/usr/bin/podman stop --time 30 covencat-worker
+Restart=always
+RestartSec=5
+TimeoutStartSec=180
+TimeoutStopSec=45
+
+[Install]
+WantedBy=default.target

deploy/ingress-relay.mjs

@@ -0,0 +1,71 @@
+import {request as httpRequest} from "node:http";
+import {createServer} from "node:http";
+
+const upstreamPort = Number.parseInt(process.env.COVEN_INGRESS_UPSTREAM_PORT || "18096", 10);
+const revision = String(process.env.COVEN_INGRESS_REVISION || "unknown");
+const baseUri = String(process.env.COVEN_GITHUB_BASE_URI || process.env.PASSENGER_BASE_URI || "/github").replace(/\/$/, "");
+const maxBodyBytes = 10 * 1024 * 1024;
+const hopHeaders = new Set(["connection", "keep-alive", "proxy-authenticate", "proxy-authorization", "te", "trailer", "transfer-encoding", "upgrade"]);
+
+function normalizedPath(url = "/") {
+  const [path, query] = url.split("?", 2);
+  let normalized = path;
+  if (path === baseUri) normalized = "/";
+  else if (path.startsWith(`${baseUri}/`)) normalized = path.slice(baseUri.length) || "/";
+  if (normalized.length > 1) normalized = normalized.replace(/\/+$/, "");
+  return `${normalized || "/"}${query === undefined ? "" : `?${query}`}`;
+}
+
+function jsonError(response, status, message) {
+  if (response.writableEnded || response.destroyed) return;
+  const body = Buffer.from(JSON.stringify({ok: false, error: message}));
+  response.writeHead(status, {
+    "Content-Type": "application/json",
+    "Content-Length": body.length,
+    "X-Coven-Ingress-Revision": revision,
+  });
+  response.end(body);
+}
+
+const server = createServer((incoming, outgoing) => {
+  const declaredLength = Number.parseInt(String(incoming.headers["content-length"] || "0"), 10);
+  if (Number.isFinite(declaredLength) && declaredLength > maxBodyBytes) {
+    incoming.resume();
+    jsonError(outgoing, 413, "payload too large");
+    return;
+  }
+  const headers = Object.fromEntries(
+    Object.entries(incoming.headers).filter(([name, value]) => value !== undefined && !hopHeaders.has(name.toLowerCase())),
+  );
+  headers.host = "127.0.0.1";
+  const upstream = httpRequest({
+    hostname: "127.0.0.1",
+    port: upstreamPort,
+    method: incoming.method,
+    path: normalizedPath(incoming.url),
+    headers,
+    timeout: 30_000,
+  }, (response) => {
+    const responseHeaders = Object.fromEntries(
+      Object.entries(response.headers).filter(([name, value]) => value !== undefined && !hopHeaders.has(name.toLowerCase())),
+    );
+    responseHeaders["x-coven-ingress-revision"] = revision;
+    outgoing.writeHead(response.statusCode || 502, responseHeaders);
+    response.pipe(outgoing);
+  });
+  let received = 0;
+  incoming.on("data", (chunk) => {
+    received += chunk.length;
+    if (received > maxBodyBytes) {
+      upstream.destroy();
+      incoming.destroy();
+      jsonError(outgoing, 413, "payload too large");
+    }
+  });
+  upstream.on("timeout", () => upstream.destroy(new Error("upstream timeout")));
+  upstream.on("error", () => jsonError(outgoing, 502, "worker unavailable"));
+  incoming.pipe(upstream);
+});
+
+const port = Number.parseInt(process.env.PORT || "3000", 10);
+server.listen(port, () => console.log(`covencat ingress relay ${revision} listening on :${port}`));

deploy/probe-runtime.mjs

@@ -0,0 +1,22 @@
+import {mkdirSync, rmSync} from "node:fs";
+import {randomUUID} from "node:crypto";
+
+import {
+  createConfig,
+  probeRuntimeIsolation,
+  runtimeIsolationIssue,
+} from "/app/dist/src/adapter.js";
+
+const config = createConfig();
+const configurationIssue = runtimeIsolationIssue(config);
+if (configurationIssue) throw new Error(configurationIssue);
+
+const attemptDir = `${config.attemptsDir}/deployment-probe-${randomUUID()}`;
+mkdirSync(attemptDir, {mode: 0o700});
+try {
+  const probeIssue = probeRuntimeIsolation(config, attemptDir);
+  if (probeIssue) throw new Error(probeIssue);
+  process.stdout.write(`${JSON.stringify({ok: true, isolation: "bwrap", network_probe: "none"})}\n`);
+} finally {
+  rmSync(attemptDir, {recursive: true, force: true});
+}