fix: stop update relaunch prompts from looping

[teamleaderleo]

Explicit update confirmation no longer reopens cmux's relaunch safety gate.

When a running command or busy agent blocks an update, choosing Install Now or Restart Now currently calls Sparkle again and can return to the same Update Ready prompt. The update driver now allows the one relaunch continuation authorized by that explicit choice, while the gate still protects the initial automatic relaunch and later requests. The regression suite covers both the deferred Restart Now path and Sparkle's repeated callback.

Validation:

• swift test --package-path Packages/macOS/CmuxUpdater (134 tests)
• python3 scripts/verify-local.py

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Summary by cubic

Fixes an infinite loop where choosing Install Now or Restart Now during a blocked update reopens the same relaunch prompt instead of proceeding.

• Grants a one-shot allowance for the relaunch continuation that follows an explicit install or restart choice, while still blocking automatic relaunches and later requests.
• Resets the allowance at the end of each update cycle and on user-initiated checks, errors, and successful installs.
• Adds regression tests for the deferred Restart Now path and Sparkle's repeated callback.

^{Written for commit 59f6652. Summary will update on new commits.}

Summary by CodeRabbit

• Bug Fixes
  • Fixed update completion flows so choosing Restart Now or explicitly retrying an installation can proceed with the required relaunch, even when a running command would otherwise block it.
  • The one-time relaunch allowance is cleared after use or when the update cycle ends, so it does not carry over to later relaunches.

[github-actions]

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⚙️ Run configuration

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

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Run ID: bbddd5dd-7df5-4ecb-aa10-b0a2a1520a96

📥 Commits

Reviewing files that changed from the base of the PR and between ac46930 and 59f6652.

📒 Files selected for processing (1)

• Packages/macOS/CmuxUpdater/Sources/CmuxUpdater/UpdateDriver.swift

📝 Walkthrough

Walkthrough

The updater now uses a one-shot allowance for explicit install continuation. It consumes the allowance on the next Sparkle relaunch request and clears it at update-cycle, check, error, and installation completion boundaries. Tests cover continuation with active blockers and an unterminated application.

Changes

Relaunch allowance

Layer / File(s)	Summary
Allowance state and gate Packages/macOS/CmuxUpdater/Sources/CmuxUpdater/UpdateDriver.swift, Packages/macOS/CmuxUpdater/Sources/CmuxUpdater/UpdateDriver+SPUUpdaterDelegate.swift	UpdateDriver tracks and consumes a one-shot allowance before checking blockers. It clears the allowance when an update check starts, an error occurs, or an update cycle or installation completes.
Explicit install continuation Packages/macOS/CmuxUpdater/Sources/CmuxUpdater/UpdateDriver.swift, Packages/macOS/CmuxUpdater/Tests/CmuxUpdaterTests/UpdateRelaunchGateTests.swift	Install and retry callbacks set the allowance before invoking Sparkle. Tests verify that explicit continuation invokes the callback, permits one relaunch request despite blockers, and leaves later requests subject to blocker checks.

Priority: ⬇️ Low

Estimated code review effort: 2 (Simple) | ~10 minutes

Change: Bug fix

Suggested reviewers: austinywang

Merge Risk: 🟡 Moderate · up to ac469

In a narrow case, the updater can relaunch while blockers are still active. This happens only if the Restart Now callback is invoked more than once. The change fixes the relaunch prompt loop, but this stale allowance should be fixed before merge.

Security Architecture Review

Security architecture risk: 🔵 Low · up to ac469

A repeated Restart Now action can renew permission to bypass relaunch checks without starting another installation. A subsequent request could therefore interrupt active work without fresh confirmation. The effect is limited to the local application, and the required production callback ordering remains unverified.

Retained concerns

• Low · reliability · observed: Restart Now renews the relaunch allowance before checking whether its install continuation has already been consumed. Repeating a retained callback can therefore grant permission without another installation. If the original allowance has been consumed and another relaunch request arrives before cleanup, that request skips blocker checks, weakening failure containment for active commands and agents. Production delivery of this sequence is not established.

Security review details

Security Blast Radius

• inferred — The supported failure scope is relaunch of the local application and interruption of its active workloads. The inspected flow does not establish cross-tenant, service, credential, or environment-wide authority expansion.

Security Findings and Attack Paths

• inferred — The conditional bypass sequence requires an explicit continuation, consumption of its allowance, another invocation of the retained Restart Now callback, and a later Sparkle relaunch request before a reset. Source supports the state transition, but neither an independently attacker-controlled invocation path nor production execution of this ordering was established.

Trust Boundaries and Controls

• observed — The allowance is cleared when a user-initiated check starts, an updater error is shown, installation completion is acknowledged, or Sparkle reports cycle completion. These boundaries limit stale permission, but do not prevent a retained callback from subsequently rearming it.

Resilience and Maintainability Implications

• observed — UpdateDriver is main-actor isolated, which serializes its state mutations. This addresses simultaneous mutation, not permission renewal caused by sequential repeated callbacks.

🚥 Pre-merge checks | ✅ 24 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 30.77% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 13 functions across 3 files.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (24 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly and concisely describes the main change: preventing update relaunch prompts from looping.
Description check	✅ Passed	The description explains the problem, resulting behavior, implementation scope, regression coverage, and validation commands. It omits the Changelog, Demo Video, and Checklist sections, but the core r…
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 pull request changes only Sparkle update relaunch handling and related tests in Packages/macOS/CmuxUpdater. The diff contains no Cloud terminal creation, cmux-tui transport, manual render…
Cmux Swift Actor Isolation	✅ Passed	PASS. The production diff only adds allowNextRelaunch state and accesses it from UpdateDriver, which remains explicitly @MainActor. The relaunch gate is also @MainActor, and the wrapped instal…
Cmux Swift Blocking Runtime	✅ Passed	PASS. The authoritative production diff adds only allowNextRelaunch state, resets, and callback branching. It adds no semaphore, blocking wait, sleep, delayed dispatch, polling loop, main-queue sync…
Cmux Browser Automation Off-Main	✅ Passed	PASS. The pull request changes only CmuxUpdater files and tests. Sources/TerminalController.swift, ControlCommandExecutionPolicy.swift, and its tests are unchanged. The diff contains no browser so…
Cmux Expensive Synchronous Load	✅ Passed	PASS — The production diff only adds allowNextRelaunch state changes, relaunch gating, callback wrapping, and gate cancellation. It adds no agent-history/session-store load, transcript or JSONL pars…
Cmux Cache Substitution Correctness	✅ Passed	PASS: The production diff adds and clears an in-memory allowNextRelaunch flag and changes relaunch callback control flow. It does not replace any fresh authoritative read with a cached or opportunis…
Cmux No Hacky Sleeps	✅ Passed	PASS: The pull request changes only Swift source and Swift test files. The custom rule applies to TypeScript, JavaScript, shell, and non-Swift build/runtime scripts. No covered non-Swift delay or slee…
Cmux Algorithmic Complexity	✅ Passed	PASS: The production diff only adds one-shot Boolean state and scalar blocker checks in UpdateDriver.swift, plus a reset in UpdateDriver+SPUUpdaterDelegate.swift. It adds no loops, collection scan…
Cmux Swift Concurrency	✅ Passed	The diff does not introduce or materially expand the prohibited concurrency patterns. It adds no Dispatch queues, Combine state, async/await replacement candidates, or Task instances; the existing Tas…
Cmux Swift @Concurrent	✅ Passed	The PR does not introduce a Swift concurrency annotation violation. The changed driver remains @MainActor, and all new callbacks are synchronous closures. The diff adds no nonisolated async, `@con…
Cmux Swift Package Boundaries	✅ Passed	PASS: The production changes are in Packages/macOS/CmuxUpdater/Sources/CmuxUpdater, which is already the CmuxUpdater SwiftPM library target declared in Packages/macOS/CmuxUpdater/Package.swift, …
Cmux Swiftpm Lockfiles	✅ Passed	The pull request changes only CmuxUpdater source and test files. It does not change Package.swift, Package.resolved, Xcode package references, the root Xcode Package.resolved, .gitignore, or workflows…
Cmux Swift Logging	✅ Passed	The production diff adds one diagnostic line through the existing UpdateLogging abstraction: log.append("update relaunch allowed after explicit confirmation"). The app injects the pre-existing `Up…
Cmux User-Facing Error Privacy	✅ Passed	PASS: The production diff changes relaunch control flow and adds only the internal diagnostic log "update relaunch allowed after explicit confirmation." It adds no user-facing error, alert, API respon…
Cmux Full Internationalization	✅ Passed	PASS: The production diff changes relaunch state and adds only developer comments plus the diagnostic log entry update relaunch allowed after explicit confirmation. It adds or changes no user-facing…
Cmux Swiftui State Layout	✅ Passed	PASS: The pull request does not introduce a SwiftUI state or layout pattern covered by the rule. The changed source files import Foundation and Sparkle, and define the MainActor UpdateDriver and its…
Cmux Architecture Rethink	✅ Passed	PASS: This is a small, local correctness fix with a clear owner and invariant. UpdateDriver, the @MainActor Sparkle bridge, owns the one-shot allowNextRelaunch token. `handleShouldPostponeRelaun…
Cmux Swift Auxiliary Window Close Shortcuts	✅ Passed	PASS: The authoritative diff changes only Sparkle update-driver logic and relaunch-gate tests. It adds no NSWindow, NSPanel, NSWindowController, SwiftUI Window, WindowGroup, close-shortcut handler, or…
Cmux Source Artifacts	✅ Passed	The PR changes only three intentional Swift source/test files: UpdateDriver+SPUUpdaterDelegate.swift, UpdateDriver.swift, and UpdateRelaunchGateTests.swift. The diff adds hand-written update log…
Cmux No Test Or Debug Seam In Production Source	✅ Passed	PASS. The PR changes only production behavior for the internal allowNextRelaunch state and does not add a test/debug accessor, test-build guard, or seam-like member. The new state is used by Sparkle…

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Actionable comments posted: 1

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• 🪄 Fix CodeRabbit comments on this PR

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Inline comments:
Review comments at
@Packages/macOS/CmuxUpdater/Sources/CmuxUpdater/UpdateDriver.swift:
- Around line 234-235: Update the Restart Now flow around allowNextRelaunch so
it is granted only when InstallOnce accepts and runs the pending continuation.
Make the Restart Now UI state prevent invoking its callback again after that
transition, so consuming the allowance cannot be undone by a repeated callback.

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ℹ️ Review info

⚙️ Run configuration

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

Review profile: ASSERTIVE

Plan: Advanced

Run ID: 9e2ec978-e94e-4788-90ad-e3828a708fa8

📥 Commits

Reviewing files that changed from the base of the PR and between 4718466 and ac46930.

📒 Files selected for processing (3)

• Packages/macOS/CmuxUpdater/Sources/CmuxUpdater/UpdateDriver+SPUUpdaterDelegate.swift
• Packages/macOS/CmuxUpdater/Sources/CmuxUpdater/UpdateDriver.swift
• Packages/macOS/CmuxUpdater/Tests/CmuxUpdaterTests/UpdateRelaunchGateTests.swift

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[github-actions]

Merge receipt for 59f6652e11, merged 2026-10-01 22:25:27 UTC

• Not verified at merge: ci-status (not reported)
• Verified: Web complexity
• Full suite: runs on main after merge.

Labeled merged-unverified: if main breaks near this merge, look here first.