98033bc869
Adds a per-machine singleton lock that engages in
ProjectEngineManager.createAndStart() before any engine subsystems
spin up. Two fn dashboard processes can no longer run engines for the
same project on the same host — previously they would share .fusion/
state and corrupt worktrees / task rows for in-process projects.
The guard combines two independent checks:
- A proper-lockfile file at <project>/.fusion/engine.lock with
stale-lock recovery (auto-released on process death).
- A loopback listener on a hashed per-project address — UDS on
POSIX, named pipe on Windows. Stale UDS files are probed and
unlinked before a retry bind.
Failures raise EngineAlreadyRunningError. Both guards are released
from stopAll() and pauseProject(); a release on engine.start()
failure lets retries re-acquire cleanly.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
21 lines
705 B
Markdown
21 lines
705 B
Markdown
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"@fusion/engine": minor
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---
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feat(engine): guard one engine per project per machine
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Adds a per-machine singleton lock that engages before each engine
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starts, preventing two `fn` dashboard processes from running engines
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for the same project on the same host (a scenario that previously
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caused worktree corruption and task-state races for in-process
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projects).
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The guard combines two independent checks:
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- A `proper-lockfile`-backed file at `<project>/.fusion/engine.lock`
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with stale-lock recovery.
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- A loopback listener (UDS on POSIX, named pipe on Windows) on a
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hashed per-project address.
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Failures throw `EngineAlreadyRunningError`; both guards are released
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on `stopAll()` / `pauseProject()`.
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