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fix(ci): transfer proof brokers through bounded run storage - #1773
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Session-Id: 01a09c40-ce3b-7f11-a7df-b6b7ccab6fd9
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Included review availability: Your plan provides up to 4 included reviews per hour; 3 remain after this review. 📝 WalkthroughWalkthroughThe PR adds run-scoped broker artifact transfer for Cloud PR proofs. It validates, chunks, uploads, downloads, verifies, and cleans up artifacts. Cloud and arm runtimes use the transfer path. Tests and CI checks cover the protocol and lifecycle. ChangesBroker artifact transfer
Priority: ⬇️ Low Estimated code review effort: 4 (Complex) | ~45 minutes Change: Bug fix Sequence Diagram(s)sequenceDiagram
participant runCloud
participant brokerTransfer
participant CloudStorage
participant runArm
runCloud->>brokerTransfer: start transfer after prepared run ID
brokerTransfer->>CloudStorage: upload parts and publish manifests
runArm->>brokerTransfer: downloadBrokerArtifact(input, arm)
brokerTransfer->>CloudStorage: poll and verify manifest and parts
brokerTransfer-->>runArm: verified executable bytes
runCloud->>brokerTransfer: release or cleanup transfer
Merge Risk: ⚪ Minimal · up to The transfer lifetime now begins when uploading starts, preserving its full budget after preparation delays. No active merge-blocking risk remains. 🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
Full details: Docstring CoverageExplanation Docstring coverage is 16.67% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 12 functions across 4 files. (1 skipped: 1 unsupported.)
✨ Finishing Touches 💡 1📝 Generate docstrings 💡
🧪 Generate unit tests (beta)
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| const lifetime = AbortSignal.timeout(options.timeoutMs ?? 120_000); | ||
| return async (url, body, exclusive = false) => { | ||
| try { | ||
| return await (options.fetchImpl ?? fetch)(url, { |
Session-Id: 01a09c40-ce3b-7f11-a7df-b6b7ccab6fd9
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Actionable comments posted: 2
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Inline comments:
In `@scripts/pr-proof/broker-transfer.mjs`:
- Around line 95-105: Move creation of the upload client and its 120-second
AbortSignal.timeout from createBrokerTransfer into start(), so the aggregate
lifetime begins when upload starts rather than during preparation. Preserve the
existing 15-second per-request timeout and request behavior in the returned
transfer function, using the client initialized by start().
- Around line 285-305: Update downloadBrokerArtifact so cleanup runs after
capturing any primary download, validation, or integrity error rather than
throwing from finally. Preserve and rethrow the primary error when cleanup also
fails; only throw the cleanup failure when the download succeeded, before
returning bytes.
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.github/workflows/relayflow-pr-proof.yml.github/workflows/test.ymldocs/pr-proof-broker-transfer.mdscripts/pr-proof/broker-transfer.mjsscripts/pr-proof/broker-transfer.test.mjsscripts/pr-proof/run-arm.mjsscripts/pr-proof/run-cloud.mjs
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Address PR #1773 review findings from Bugbot and CodeRabbit: - The 120-second aggregate upload lifetime now starts inside start(), when the prepared run ID is known, instead of at createBrokerTransfer. A slow `cloud run` prepare no longer consumes the budget before the first exclusive PUT. - downloadBrokerArtifact runs consumption cleanup after capturing the primary download/validation/integrity error and rethrows that error when cleanup also fails; the cleanup failure is thrown only when the download itself succeeded, still before any bytes are returned. - The dispatcher's submission-timeout and poll-deadline paths tombstone the transfer before cancelRemote revokes the prepared-run write grant. A cleanup failure is warned and never replaces the dispatcher's own failure. Tests: the fake fetch now honors abort signals so the lifetime case bites; new cases cover lifetime start, cleanup-error precedence, and a hung submission whose tombstones must precede `cloud cancel`. All four affected cases fail on the previous sources and pass now (54/54). Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
3 participants
Cloud PR proof currently puts both exact broker executables into code sync, exceeding the seed request limit before either case runs. This change transfers those same verified bytes through existing run-scoped storage in bounded parts. Code sync carries only the validated proof input.
Each part binds the run, nonce, arm, source SHA, raw build hash, total length, and index/count. Exclusive uploads publish a manifest last. Isolated arms read each part once, verify the original final SHA-256, consume/tombstone their transfer while the sandbox token is live, then use the unchanged private mode-0500 executable and attestation boundary. Failed uploads are cleaned before cancellation revokes the prepared-run grant. No broker requirement, case outcome, or isolation check is relaxed.
This is a trusted-base prerequisite for #1772 and its durable task proof.
pull_request_targetexecutes base scripts, so this prerequisite must be reviewed/admitted separately before that proof can use the repair. No merge or deployment has been performed. Cloud's existing PUT/GET and exclusive creation contract was checked at revision2ca32360; no endpoint change is required. Forced runner loss or independent remote token revocation can prevent cleanup; storage remains run-scoped and contains public binaries, never credentials.Validation (Node 22.22.1, macOS):
node --test scripts/pr-proof/broker-transfer.test.mjs scripts/pr-proof/run-cloud.test.mjs: 51 passed, 0 failed, exit 0. Includes dispatcher success and upload-failure cancellation/cleanup with a fake CLI and mocked storage, plus integrity/bounds/replay cases.vitest run tests/fixtures/pr-proof-contract.test.ts: 112 passed, 6 existing platform skips, exit 0. Linux-only isolation checks were not exercised locally.1259edf83d4fff00a94862b4d20c4377afc06838anda8577736dd32c0bcf51a37f88ac0b04fb056da3fround-tripped through mocked storage with their original SHA-256s: 23,080,192 and 23,426,696 bytes. 26 objects, 78 upload/read/cleanup requests; largest request 2,796,566 bytes; exit 0. This is byte-transfer evidence, not a Cloud execution claim.git diff --check: exit 0. Added the dependency-free transfer guard suite to the existing test workflow. No runtime package/Rust source changed; those broader suites were not rerun for this infrastructure-only patch.RelayFlow Proof
non-functionaln/aThis changes only CI proof tooling, its tests/workflow, and documentation. The repository's unchanged diff classifier recognizes these paths as non-runtime; no runtime proof case is claimed for this prerequisite.
Review hardening: bearer transfers require HTTPS except literal loopback IPs. The finalizer releases buffers only after proof success; failed/cancelled/error statuses attempt bounded tombstone cleanup. Four early-terminal regression cases failed before this correction and now pass, including revoked storage authority returning an explicit cleanup failure. Independent terminal revocation can still make remote cleanup impossible; this is reported, never converted to successful consumption.
Note
Medium Risk
Touches trusted
pull_request_targetproof dispatch and bearer-authenticated Cloud storage for large binaries; failures are bounded and fail-closed, but misconfiguration or cleanup gaps could block or leave run-scoped objects until expiry.Overview
Cloud PR proof no longer ships broker executables through code sync. The RelayFlow workflow only force-adds the validated proof input and asserts
.relayflow/pr-proof-binariesnever enters the git index; binaries stay on the runner and move through existing run-scoped Cloud storage after the prepared-run ID is known.A new
broker-transferpath chunks each base/head artifact (size caps, binding metadata, exclusiveIf-None-Match: *parts, manifest last), uploads with CI credentials, and lets isolated arms download with the sandbox token, verify the final SHA-256, tombstone objects, then feed the unchanged private executable path inrun-arm.mjs.run-cloud.mjsprepares the transfer locally, starts upload when the prepared run ID appears, and tombstones or releases buffers on failure, timeout, signals, or success.CI adds
node --testforbroker-transfer.test.mjsand dispatcher integration cases;docs/pr-proof-broker-transfer.mddocuments the contract and trusted-base admission requirement.Reviewed by Cursor Bugbot for commit 747ffa7. Bugbot is set up for automated code reviews on this repo. Configure here.
At reviewed head
51e6f399ccad84e582a1886443e7bc2e164abe8d, all non-bot CI checks completed successfully or were skipped; the superseded dispatcher was cancelled and its replacement succeeded. The required RelayFlow proof context passed under the non-functional classification above. This does not demonstrate the downstream durable-task case executing in Cloud.