Keep Devices rollouts reversible and remote workspaces alive

[austinywang]

The Devices deploy configuration still names forwarding aliases, and normal Worker activation upgrades SQLite to schema 7 even though the previous deployed reader rejects it. The Mac client also incorrectly treats inboundPeers from an iOS-only service as proof of Mac admission support. This follow-up fixes those rollout hazards and two remote-workspace creation failures without deploying production.

• Deploy to existing cmux-v2 canonical Workers and preserve their namespaces, variables and secrets. Only the deployment names from Rename v2 Workers and preserve legacy hostnames #13768 are adopted; that PR still owns the broader client-origin rename and alias tooling.
• Ship a reader-first Worker: normal activation retains schema 6, while the reader and audit retention work with either schema 6 or 7. The immutable v7 migration is retained for a separate reviewed promotion.
• Guard staging and production with active-version provenance, SQLite reader/writer compatibility, existing namespace IDs, scope probes and post-deploy health. Production requires the same revision in staging and on fetched origin/main. Unknown legacy deployments fail closed; only exact audited v6 versions qualify for the bootstrap. Concurrent replacements are never automatically rolled back.
• Require the explicit cmux.mac-peer-inbound.v1 directory rule and refresh Mac discovery when rules change.
• Route sidebar creation through the selected Mac, like Cmd-N. Commit a successful remote creation before retiring its local placeholder: the old ordering immediately deleted the newly created remote workspace. The shared iOS transport, signing and permission policy are unchanged.

Validation: Worker CI passed 71 unit tests and 34 real-workerd control/permission/storage tests under Bun 1.4.2. Native CI on 60ab69a511 executed and passed 111 Devices tests plus 24 changed-suite tests. Its accounting gate then required removal of a now-passing known-failure exemption; that exemption is removed on the current head. The queue-janitor fix from main and the runner freshness regression expectation are also incorporated. All checks passed at 1fcef8210d; the final test-fixture-only revision and main conflict resolution are rerunning required checks.

The workspace failure was reproduced on both Macs with build 643a58572: Cmd-N created a remote workspace, then placeholder teardown deleted it about 450 ms later. On the repaired build, Cmd-N, the remote sidebar menu, and double-clicking the left sidebar each created exactly one persistent remote workspace. The remote Mac’s workspace count increased from one to four; a terminal command returned cmuxs-MacBook-Pro.local. Reverse-direction creation through the same provider also succeeded. The user confirmed the dev build works and approved merging once checks pass.

Both Macs are running authenticated issue-13458-remote-workspace-verified, built at 60ab69a511 by controller job e3ddf7af47ec98c407d98987. Its digest is 88cb5afef04965f4afd4f89dfcd6faa659545000ac38f99084dc0ac4f860256f. Sources/ and Worker runtime source are unchanged between that build and current head; subsequent changes repair CI and incorporate main.

The development-only canonical Worker was updated to 1fcef8210d after auditing its exact v6 reader, checking authentication scope and stable deployment metadata, and validating a dry-run. Post-deploy checks confirmed unchanged namespace IDs, matching source revision, the explicit Mac rule, and reader 7/writer 6. Secrets and variables were retained. Production and staging remain unchanged. Live staging and existing iOS-client rollout verification are still required before production; promoting writes to schema 7 remains a separate reviewed change.

Review follow-up freezes all v4 migration SQL and its historical hash in the old-reader fixture; all 17 storage runtime tests pass. The suggested native cleanup barrier belonged to a different coordinator and was rejected with call-path evidence. Both review threads are resolved.

The schema-preservation regression failed before its repair; canonical-target rejection was replayed against the pre-fix script. Static checks, test wiring and all nine localization catalogs passed, with no new or changed UI keys.

Follow-up to #13472 and #13458. Related rename work: #13768.

— HarborMica · pending
Run: run_cmux203_safe_rollout_20260925_01
Session: codex-cmux203-safe-rollout-20260925
Intention: merge after final-head checks and review feedback pass; production deployment remains separate.

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Summary by cubic

Follow-up to the Devices rollout that keeps rollback safe: deploys to the canonical cmux-v2 Workers, retains SQLite schema 6 on normal activation so the deployed v6 reader stays a valid rollback target, requires Mac clients to see an explicit admission rule before enabling Mac-to-Mac links, and preserves the remote Mac target when a workspace is created from the sidebar.

Deployment and storage guards

• Deploys to the cmux-v2 canonical Workers; the old cmux-iroh-v2* names stay as forwarding aliases for existing clients, with namespaces, variables, and secrets preserved.
• Normal Worker activation writes schema 6 while the reader accepts 6 and 7; the v7 migration stays intact for a separate reviewed promotion.
• Staging now uses the same guards as production: active-version provenance, SQLite reader/writer compatibility, namespace IDs, scope probes, and post-deploy health. Production also requires the same revision on staging and on fetched origin/main.
• Unknown legacy deployments fail closed rather than trusting a missing health route; only exact audited v6 version IDs qualify for the first rollout.
• A dirty source tree is refused before upload instead of publishing an unknown revision.
• Concurrent replacements are never auto-rolled-back; rollback only happens to the verified v6 reader while the script's own deployment is still current.
• The storage runtime suite proves rollback against the frozen v6 reader, which now also freezes the historical socket migration: it reopens both schemas, preserves devices and revocation, and keeps audit retention bounded on each.
• The development CI deploy, the production-drift check, and the storage runtime suite now use the canonical Worker name and Bun 1.4.2, and retain the published source revision; the previously exempted layout insertion regression is now required to pass.

Mac client admission and sidebar creation

• Mac-to-Mac links now require the explicit cmux.mac-peer-inbound.v1 directory rule; inboundPeers alone no longer counts, since iOS-only Workers also return it.
• Directory discovery refreshes when rules change, so a newly advertised rule takes effect without a peer change.
• Creating a workspace from the sidebar keeps the remote Mac target: creation commits before the provider's native pane teardown can cancel the accepted workspace, including when replacing the reserved pane schedules cleanup asynchronously; the regression exercises both the pre- and post-teardown paths.

^{Written for commit f7b8848. Summary will update on new commits.}

Summary by CodeRabbit

• Bug Fixes

  • Improved remote workspace creation so accepted workspaces remain available and duplicate or unintended local workspaces are avoided.
  • Empty-area sidebar actions now support creating a workspace from a selected remote workspace.
  • Device directory rule changes now refresh discovery, and Mac-link availability reflects the advertised admission rule.

• Improvements

  • Deployment health checks now report storage compatibility, supporting safer staged updates and rollback.
  • Updated deployment verification for staging and production environments.

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• workers/iroh-v2/e2e/fixtures/schema-v6.ts

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📝 Walkthrough

Walkthrough

This change updates cloud workspace creation and device-link admission. It also adds reader-first storage compatibility and guarded staging and production deployment checks for Iroh v2.

Changes

Cloud workspace creation

Layer / File(s)	Summary
Device-aware workspace routing Sources/AppDelegate.swift, cmuxTests/CloudNativeLayoutProjectionTests.swift, scripts/ci/app-host-known-failures.json	The sidebar action also uses the new-workspace path when the selected workspace has a device machine. Tests cover sidebar and standard actions; the related known-failure entry is removed.
Reservation completion and pane replacement Sources/Surfaces/CloudWorkspaceCreationCoordinator.swift, cmuxTests/CloudWorkspaceCreationSidebar*	Creation now finishes before reservation completion. Test providers and tests cover reservation adoption, fallback pane materialization, remote-close callbacks, and successful creation.

Device-link admission

Layer / File(s)	Summary
Directory-rule discovery and admission Sources/Devices/DeviceIrxClient.swift, Sources/Devices/DeviceLinkControlPlaneRules.swift, cmuxTests/DeviceDirectoryMergeTests.swift, cmuxTests/DeviceLinkControlPlaneRulesTests.swift	Discovery equality includes sorted directory rules. Mac-link admission requires the named rule, and tests cover rule-change notifications and admission results.

Iroh v2 storage and deployment

Layer / File(s)	Summary
Reader-first storage compatibility workers/iroh-v2/src/health.ts, src/routing.ts, src/storage/*, e2e/fixtures/schema-v6.ts, e2e/storage-*, test/routing.test.ts	The Worker reports maximum and write schema versions. Normal migrations write through version 6 while supporting schema history through version 7. Storage helpers and runtime tests cover both schema versions.
Rollout target and schema validation workers/iroh-v2/scripts/rollout-policy.ts, workers/iroh-v2/test/rollout-policy.test.ts	The rollout policy checks canonical targets, Durable Object bindings, health metadata, migration state, and storage compatibility before and after publication. Tests cover accepted and rejected conditions.
Staging and production deployment workers/iroh-v2/scripts/deploy-*.sh, workers/iroh-v2/test/deploy-production.test.ts, workers/iroh-v2/wrangler.jsonc, workers/iroh-v2/README.md, workers/iroh-v2/scripts/check-production-drift.ts, .github/workflows/iroh-v2*.yml	The deployment script supports staging and production with source-revision and health checks. Worker names, workflow deployment settings, drift checks, tests, and rollout documentation use the updated targets and gates.

Priority: ⬇️ Low

Estimated code review effort: 4 (Complex) | ~60 minutes

Change: Bug fix

Sequence Diagram(s)

sequenceDiagram
  participant Deploy as deploy-production.sh
  participant Policy as rollout-policy.ts
  participant Wrangler
  participant Staging as Staging health endpoint
  participant Target as Selected Worker health endpoint
  Deploy->>Policy: Validate target and pre-deployment metadata
  Deploy->>Wrangler: Read active version and deployment details
  Deploy->>Staging: Check staging health and source revision for production rollout
  Deploy->>Policy: Check rollout compatibility
  Deploy->>Wrangler: Deploy selected environment and retain variables
  Deploy->>Target: Read deployed version and health
  Deploy->>Policy: Verify published revision, rules, namespaces, and storage policy

Loading

Merge Risk: 🔵 Low · up to f7b88

The migration-fixture concern has been addressed. The cloud-workspace regression test may still miss delayed remote cleanup, so merge with owner awareness of that remaining test gap.

Security Architecture Review

Security architecture risk: 🟡 Moderate · up to f7b88

The rollout adds substantial safeguards, but its automatic rollback can still race with another deployment. No remotely exploitable issue was established; the remaining risk concerns deployment integrity and incomplete visibility into the production environment.

Retained concerns

• Medium · security · inferred: The new staging rollback path checks deployment ownership before issuing rollback, but the check and rollback are not atomic. A replacement deployed between them could be rolled back, potentially undoing newer controls or configuration. The marker and identity checks substantially narrow, but do not close, that interval.

Security review details

Security Blast Radius

• inferred — The identified rollback race requires another actor capable of changing the same Worker deployment during release. Its independently affected scope is that Worker lane and the controls served by its active version, not an unauthenticated request path.

Security Findings and Attack Paths

• inferred — No production attacker path was established through the exported schema-6 fixture: its observed HTTP caller is a test Worker built for Miniflare, while the deployment entrypoint is elsewhere. The rollout concurrency gap is a conditional deployment-integrity concern, not a verified remote exploit.

Trust Boundaries and Controls

• observed — Explicit directory rules govern Mac admission, while rollout checks bind the published Worker to an expected environment, revision, storage policy, and existing namespaces.

Resilience and Maintainability Implications

• observed — The deployment script deliberately skips automatic rollback when it cannot verify that its own deployment remains active. This limits accidental replacement, but leaves failures requiring operator recovery.

Hardening Proposals

• proposed — Where the deployment platform permits it, make rollback conditional on the deployment identity at execution time; otherwise use an exclusive release lock or require manual rollback after a failed post-deploy check.

🚥 Pre-merge checks | ✅ 24 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 6.45% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 31 functions across 24 files.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (24 passed)

Check name	Status	Explanation
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Cmux Cloud Persistent Session And Early Input	✅ Passed	PASS. The changed cloud code keeps local manual-pane admission before the first remote await, so it does not add a PTY, shell-readiness, or attachment gate. The coordinator change commits the operatio…
Cmux Swift Actor Isolation	✅ Passed	No changed production Swift declaration introduces or worsens an actor-isolation mistake. AppDelegate remains explicitly @MainActor; the changed sidebar routing stays within that UI-bound type. `C…
Cmux Swift Blocking Runtime	✅ Passed	The reviewed Swift production changes add no blocking or timing primitives. They only change routing, discovery-state comparison, admission-rule checks, and completion ordering. The only new wait is `…
Cmux Browser Automation Off-Main	✅ Passed	PASS. The pull request does not change Sources/TerminalController.swift or ControlCommandExecutionPolicy.swift, the files scoped by the rule. The native diff changes workspace creation and Devices…
Cmux Expensive Synchronous Load	✅ Passed	PASS. The production Swift diff only changes sidebar routing, device-directory rule comparison, and remote-workspace completion ordering. It adds no synchronous agent-history loader, transcript or tra…
Cmux Cache Substitution Correctness	✅ Passed	PASS: The production diff does not replace a fresh authoritative read with a cached or opportunistic value. The Swift changes add discovery invalidation data, route workspace creation, and reorder com…
Cmux No Hacky Sleeps	✅ Passed	The diff introduces no fixed sleeps, timers, delayed dispatch, polling loops, or wall-clock race workarounds in covered non-test runtime code. The new deploy-production.sh health calls use bounded `…
Cmux Algorithmic Complexity	✅ Passed	PASS. The production changes do not introduce a scalable nested scan or per-target rescan. The new rollout checks scan only fixed deployment metadata and two Durable Object bindings. `CONTROL_PLANE_RU…
Cmux Swift Concurrency	✅ Passed	The Swift diff does not introduce or materially expand the prohibited legacy concurrency patterns. Production changes only adjust routing, discovery-state comparison, control-plane rule checks, and th…
Cmux Swift @Concurrent	✅ Passed	The Swift diff introduces no @concurrent or nonisolated async declarations. CloudWorkspaceCreationCoordinator remains @MainActor; the change only reorders finish and host.complete. `Device…
Cmux Swift Package Boundaries	✅ Passed	PASS: The pull request does not introduce or materially expand a Swift feature that requires a new package boundary. AppDelegate.swift contains sidebar action wiring. `CloudWorkspaceCreationCoordina…
Cmux Swiftpm Lockfiles	✅ Passed	The pull request does not change a SwiftPM manifest, Package.resolved file, .gitignore, or Xcode project package references. Its only workflow changes update Bun and a Worker URL/deploy command. There…
Cmux Swift Logging	✅ Passed	PASS. The Swift diff adds no print, debugPrint, dump, NSLog, ad hoc logging, or Logger declarations. The only logging-adjacent change is the debug source label in AppDelegate; its consumer i…
Cmux User-Facing Error Privacy	✅ Passed	No changed text reaches a cmux end user through an identified app, product CLI, or product API error path. The app changes alter workspace routing and discovery logic; the existing “The Devices servic…
Cmux Full Internationalization	✅ Passed	No changed user-facing copy requires internationalization. The Swift production diff changes workspace routing, discovery state, admission checks, and creation ordering; its only changed string is the…
Cmux Swiftui State Layout	✅ Passed	PASS: The pull request changes Swift files, but it does not introduce or materially expand SwiftUI state or layout patterns covered by the rule. The added Swift code only changes sidebar routing, disc…
Cmux Architecture Rethink	✅ Passed	The Swift diff does not introduce a prohibited architectural workaround. Sidebar creation now uses the existing performNewWorkspaceAction path. CloudWorkspaceCreationCoordinator commits the operat…
Cmux Swift Auxiliary Window Close Shortcuts	✅ Passed	The Swift diff does not add or materially change a standalone cmux-owned window. Production changes affect workspace routing, device discovery rules, and cloud-workspace coordination only. The changed…
Cmux Source Artifacts	✅ Passed	PASS. The reviewed range changes 29 intentional source, test, script, workflow, config, documentation, and fixture paths. The three added files are a frozen schema-v6 test fixture, rollout-policy sour…
Cmux No Test Or Debug Seam In Production Source	✅ Passed	PASS. The PR changes four Swift files under Sources/, but the additions only implement production workspace routing, discovery-rule comparison, admission checks, and creation ordering. No added `#if…
Title check	✅ Passed	The title clearly summarizes the two primary changes: safer Devices rollouts and reliable remote workspace creation.
Description check	✅ Passed	The description is detailed and covers the change summary, testing results, behavior verification, rollout status, and review follow-up. It does not use the template headings or include a direct demo …

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• 🪄 Fix CodeRabbit comments on this PR

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only still-valid issues, skip the rest with a brief reason, keep changes
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Inline comments:
In `@cmuxTests/CloudWorkspaceCreationSidebarTests.swift`:
- Line 44: Replace the fixed XCTWaiter timeout for unexpectedClose with
CloudPlacementCoordinator.waitForPendingMutations() as the cleanup barrier
before asserting that no remote close occurred.

In `@workers/iroh-v2/e2e/fixtures/schema-v6.ts`:
- Line 5: Update the v6 reader in schema-v6.ts to stop importing live
SOCKET_MIGRATION_STATEMENTS; embed the v4 statements and expected v4 hash as
literals copied from revision 8c7ae55e03 so future migration edits cannot change
the fixture’s compatibility check.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Repository: manaflow-ai/cmux/.coderabbit.yaml

Review profile: ASSERTIVE

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Run ID: 436036f7-1449-475a-9eef-6fc4ba9d01f5

📥 Commits

Reviewing files that changed from the base of the PR and between e20651a and 1fcef82.

📒 Files selected for processing (30)

• .github/workflows/iroh-v2-production-drift.yml
• .github/workflows/iroh-v2.yml
• Sources/AppDelegate.swift
• Sources/Devices/DeviceIrxClient.swift
• Sources/Devices/DeviceLinkControlPlaneRules.swift
• Sources/Surfaces/CloudWorkspaceCreationCoordinator.swift
• cmuxTests/CloudNativeLayoutProjectionTests.swift
• cmuxTests/CloudWorkspaceCreationSidebarFixture.swift
• cmuxTests/CloudWorkspaceCreationSidebarProvider.swift
• cmuxTests/CloudWorkspaceCreationSidebarTests.swift
• cmuxTests/DeviceDirectoryMergeTests.swift
• cmuxTests/DeviceLinkControlPlaneRulesTests.swift
• scripts/ci/app-host-known-failures.json
• tests/test_run_e2e.py
• workers/iroh-v2/README.md
• workers/iroh-v2/e2e/fixtures/schema-v6.ts
• workers/iroh-v2/e2e/storage-runtime.test.ts
• workers/iroh-v2/e2e/storage-worker.ts
• workers/iroh-v2/scripts/check-production-drift.ts
• workers/iroh-v2/scripts/deploy-production.sh
• workers/iroh-v2/scripts/deploy-staging.sh
• workers/iroh-v2/scripts/rollout-policy.ts
• workers/iroh-v2/src/health.ts
• workers/iroh-v2/src/routing.ts
• workers/iroh-v2/src/storage/migrations.ts
• workers/iroh-v2/src/storage/team-store.ts
• workers/iroh-v2/test/deploy-production.test.ts
• workers/iroh-v2/test/rollout-policy.test.ts
• workers/iroh-v2/test/routing.test.ts
• workers/iroh-v2/wrangler.jsonc

💤 Files with no reviewable changes (1)

• scripts/ci/app-host-known-failures.json

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