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fix(v3/application): release the single-instance lock at the start of shutdown - #6240
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Included review availability: This review used your included allowance. Your plan provides up to 10 included reviews per hour; 9 remain after this review. WalkthroughLinux single-instance locking now uses a session D-Bus name. Linux lock release frees the name and closes its connection. Windows lock acquisition stores the mutex handle and closes a nonzero handle on error. Application cleanup releases the single-instance lock before running shutdown tasks. ChangesSingle-instance lifecycle
Priority: ⬇️ Low Estimated code review effort: 2 (Simple) | ~10 minutes Change: Bug fix Merge Risk: ⚪ Minimal · up to The lock-release change is ready to merge after normal checks; no outstanding issue was established. 🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
Full details: Docstring CoverageExplanation Docstring coverage is 25.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 4 functions across 5 files. (1 skipped: 1 unsupported.)
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🟡 Changes recommended
Linux connection cleanup is incomplete, and the new shutdown timing introduces a Windows relaunch regression.
Review effort: Balanced
Findings: 2
Open (2)
What changed in this PR
Releases single-instance ownership earlier during shutdown so a replacement Linux instance can start.
Changes:
- Tracks and releases the Linux D-Bus name.
- Moves lock cleanup before shutdown hooks.
- Adds a Linux regression test and changelog entry.
| File | Description |
|---|---|
v3/UNRELEASED_CHANGELOG.md |
Documents the Linux fix. |
v3/pkg/application/single_instance_linux.go |
Retains and releases the D-Bus connection. |
v3/pkg/application/single_instance_linux_test.go |
Verifies the bus name becomes available. |
v3/pkg/application/application.go |
Performs single-instance cleanup before hooks. |
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Actionable comments posted: 1
- 🪄 Fix CodeRabbit comments on this PR
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Inline comments:
Review comments at @v3/pkg/application/single_instance_linux.go:
- Around line 135-136: Update the shutdown cleanup around ReleaseName to log any
error returned while releasing l.dbusName, then close the private D-Bus
connection before setting l.conn to nil so the bus releases any name it still
owns.
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v3/UNRELEASED_CHANGELOG.mdv3/pkg/application/application.gov3/pkg/application/single_instance_linux.gov3/pkg/application/single_instance_linux_test.go
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Automated v3 GA-readiness test result for head
The results match the master baseline at |
Description
On Linux a running app keeps its single-instance D-Bus name until the process has fully exited:
linuxLock.releaseonly cleared a file lock thatacquirenever sets on Linux, and the single-instance cleanup ran near the end ofApp.cleanup, after the shutdown hooks. An instance launched while the first one is shutting down therefore finds the name taken, hands its arguments to the exiting app and quits, so nothing ends up running.The fix:
linuxLockkeeps the session bus connection fromacquire, andreleasegives up the bus name withReleaseName. The unused file field and its flock code are removed.App.cleanupreleases the single-instance lock at its start, before the shutdown hooks, throughInvokeSyncbecause the Windows lock owns a message window on the main thread.singleInstanceManager.cleanupalready returns early when no manager is configured.windowsLock.acquirekeeps the handle fromCreateMutex, soreleasecloses the mutex. Before, the handle was discarded and the mutex lived until the process exited; with the earlier release, an instance launched during the shutdown hooks would find the mutex but no window and exit. A second instance also closes the handle it gets back withERROR_ALREADY_EXISTS.linuxLock.releasecloses its private session bus connection afterReleaseName, which also drops the name ifReleaseNamefailed.Type of change
How Has This Been Tested?
Added
TestLinuxLockReleaseFreesTheBusNameinsingle_instance_linux_test.go: it acquires the lock on the real session bus, releases it, and checks that the name is free and the lock's connection is closed. It skips when no session bus is available. It fails on master and passes on this branch.Added
TestWindowsLockReleaseFreesTheMutexinsingle_instance_windows_test.go: a second lock is refused while the first is held, and a third acquires once the first is released. Run on Windows 11 (26H2, amd64) from a cross-compiled test binary, it fails without the mutex change ("application is already running") and passes with it.cd v3 && go test ./pkg/application/passes on this branch,GOOS=windows go build ./pkg/applicationbuilds, andgofmt -lon the changed files is empty.Test Configuration
Fedora Linux 44 Workstation, amd64, GNOME session bus. Only the
pkg/applicationunit tests were run for this change, so nowails doctoroutput applies.Checklist:
website/src/pages/changelog.mdxwith details of this PR (v3 changelog entries are added automatically)An entry is added to
v3/UNRELEASED_CHANGELOG.md.The code and this description were written with an AI assistant (Claude). I reviewed the diff and ran the tests listed above.
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