fix(daemon): controlled exit on SIGTERM — gate new work, drain 5 s, flush - #1486
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📝 WalkthroughWalkthroughThe daemon now coordinates operation admission with shutdown. On SIGTERM, it refuses selected new operations, waits for admitted requests and active operations within a fixed budget, then removes daemon records and performs a bounded cache flush. The CLI adjusts its wait based on the platform and termination outcome. ChangesDaemon shutdown flow
Priority: ➖ Normal Estimated code review effort: 4 (Complex) | ~45 minutes Change: Bug fix Sequence Diagram(s)sequenceDiagram
participant TerminationSignal
participant DaemonTask
participant OperationRoutes
participant DaemonContext
participant Cleanup
participant Zccache
TerminationSignal->>DaemonTask: SIGTERM received
DaemonTask->>OperationRoutes: begin shutdown
OperationRoutes-->>DaemonTask: refuse new operations with HTTP 503
DaemonTask->>DaemonContext: wait for admitted requests and active operations
DaemonTask->>Cleanup: remove daemon records
Cleanup->>Zccache: flush within exit budget
Merge Risk: 🟡 Moderate · up to The existing shutdown test fails under the new admission contract. Update its setup before merging; the investigated emulator routes do not require an additional shutdown gate. Security Architecture ReviewSecurity architecture risk: 🟡 Moderate · up to A request that remains open before starting an operation can now prevent ordinary HTTP shutdown. Forced termination remains available, but the change affects a shared availability control. The consequences of flushing the cache when work outlasts the drain period are not fully established. Retained concerns
Security review detailsSecurity Blast Radius
Security Findings and Attack Paths
Trust Boundaries and Controls
Resilience and Maintainability Implications
Hardening Proposals
🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
✨ Finishing Touches 💡 2📝 Generate docstrings 💡
🛠️ Fix failing CI checks 💡
🧪 Generate unit tests (beta)
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- 🪄 Fix CodeRabbit comments on this PR
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Inline comments:
In `@crates/fbuild-cli/src/cli/daemon_stop.rs`:
- Around line 198-204: Update terminate_and_confirm so
GRACEFUL_TERMINATION_BUDGET is used only on Unix: keep the successful
kill_process branch on Unix using that budget, and use TERMINATION_BUDGET on
non-Unix platforms so Windows retains its 5-second budget.
In `@crates/fbuild-daemon/src/shutdown.rs`:
- Around line 33-50: Update refuse_new_operations_when_shutting_down to use an
atomic admission handshake shared with the shutdown transition, returning its
existing 503 OperationResponse when admission is refused. Keep the admission
token alive through next.run(request).await, and ensure the drain counts
admitted requests before it can observe zero.
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ci/platform_boundary_research.tsvis excluded by!**/*.tsv
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crates/fbuild-cli/src/cli/daemon_stop.rscrates/fbuild-core/src/daemon_health.rscrates/fbuild-core/src/platform/linux/process.rscrates/fbuild-core/src/platform/macos/process.rscrates/fbuild-core/src/platform/process.rscrates/fbuild-core/src/platform/windows/process.rscrates/fbuild-daemon/src/README.mdcrates/fbuild-daemon/src/context.rscrates/fbuild-daemon/src/handlers/operations/common.rscrates/fbuild-daemon/src/lib.rscrates/fbuild-daemon/src/main.rscrates/fbuild-daemon/src/shutdown.rs
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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 @crates/fbuild-daemon/src/handlers/health.rs:
- Line 157: Update the shutdown test around ctx.try_begin_shutdown to hold an
OperationAdmission token from ctx.begin_operation_admission() while asserting
the busy response, instead of setting operation_in_progress directly. Keep the
token alive through the assertion so the context remains admitted during the
shutdown check.
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crates/fbuild-cli/src/cli/daemon_stop.rscrates/fbuild-daemon/src/context.rscrates/fbuild-daemon/src/handlers/health.rscrates/fbuild-daemon/src/handlers/operations/build.rscrates/fbuild-daemon/src/handlers/operations/common.rscrates/fbuild-daemon/src/shutdown.rs
🚧 Files skipped from review as they are similar to previous changes (2)
- crates/fbuild-cli/src/cli/daemon_stop.rs
- crates/fbuild-daemon/src/shutdown.rs
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…lush
Before this, SIGTERM on Linux/macOS (`fbuild daemon kill`, the escalation
in `fbuild daemon stop`, docker stop, CI teardown) killed the daemon with
no zccache flush and stale pid/port files. Routing it through the graceful
HTTP drain would instead wait out every running build.
- New fbuild_daemon::shutdown:
- refuse_new_operations_when_shutting_down: operation routes (build,
deploy, monitor, install-deps, reset, test-emu) answer 503 with a failed
OperationResponse once shutdown has started (SIGTERM or HTTP shutdown).
- exit_on_terminate: on SIGTERM, refuse new work, wait up to 5 s for
in-flight operations, flush zccache (4 s cap), clean up records, exit.
- persist_and_clean_up: the pid/port/claim/status cleanup + bounded flush
now shared by every clean exit.
- DaemonContext::active_operations: exact in-flight count kept by
OperationGuard (the operation_in_progress bool is cleared by the first of
two concurrent operations to finish), plus wait_for_operations(budget).
- fbuild_core::daemon_health: SHUTDOWN_DRAIN_BUDGET (5 s), EXIT_FLUSH_BUDGET
(4 s), TERMINATE_EXIT_BUDGET (their sum).
- `fbuild daemon stop`: after a delivered graceful terminate, wait
TERMINATE_EXIT_BUDGET + 1 s before the forced kill so it never lands
mid-flush; a refused terminate keeps the 5 s wait.
Follow-up to #1480 / #1482.
The platform boundary forbids #[cfg(unix)] outside fbuild_core::platform. Add fbuild_core::platform::process::daemon_terminate_signal() (tokio SIGTERM on Linux/macOS, never resolves on Windows, whose termination requests already arrive via register_daemon_shutdown_handler) and use it from the daemon. Regenerate ci/platform_boundary_research.tsv for the shifted windows/process.rs rows.
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Addressed in subsequent PR commits; all inline threads resolved and focused shutdown tests pass after rebase.
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Follow-up to #1480 / #1482: the first of the two known limits noted in #1482.
Problem
On Linux and macOS the daemon did not handle SIGTERM. The signal's default action killed the process instantly: no zccache flush, and the pid/port/status files were left behind. SIGTERM comes from:
fbuild daemon killwithout--force.fbuild daemon stop.docker stop, systemd, and CI runner teardown.The existing graceful HTTP drain is not a fit either, because it waits for every open request, and a running build is one long request.
Change: controlled exit on SIGTERM
/api/build,/api/deploy,/api/monitor,/api/install-deps,/api/reset,/api/test-emu) answer503with a failedOperationResponse: "fbuild daemon is shutting down and accepts no new work; rerun the command to start a fresh daemon". The CLI already prints that message. The same gate applies after an accepted HTTP shutdown, since both setis_shutting_down.SHUTDOWN_DRAIN_BUDGET). This uses a new exact in-flight counter,DaemonContext::active_operations, kept byOperationGuard. The existingoperation_in_progressbool is cleared by whichever of two concurrent operations finishes first, so it can't be used to wait for all of them.EXIT_FLUSH_BUDGET), remove the pid/port/claim/status files, then exit. Build children still running at that point are reaped by the process containment group.The worst case is 5 s + 4 s. Normally it is about 150 ms plus whatever an in-flight operation needs.
CLI: after a delivered graceful terminate,
fbuild daemon stopnow waitsTERMINATE_EXIT_BUDGET + 1 s(10 s) before forcing a kill, so the kill never lands mid-flush. A refused terminate (the usual Windowstaskkillcase) keeps the old 5 s wait.persist_and_clean_upis now the single cleanup-and-flush step for both the HTTP/Ctrl+C exit and the SIGTERM exit. Windows is unchanged: its close, logoff and shutdown events already go through the graceful path.Validation
soldr cargo clippy --workspace --all-targets -- -D warnings,bash test,cargo fmt --check: all clean.shutdown::tests: operations run normally; operations are refused with the message once shutdown starts; the drain returns as soon as the last operation ends; the drain gives up at its budget; the budget constants are consistent.operation_guards_count_concurrent_operations_exactly.SIGTERM received … in_flight=1. A second build sent 0.35 s later was refused with the message above. After 5 s the log showsin-flight operations still running after 5s; exiting anyway, thenmetadata cache flushedandzccache backend flushed(about 155 ms). The pid/port files were removed. The in-flight build reportedlost connection to daemon mid-build.--clean):in-flight operations finished, then the flush and exit. The daemon exited 339 ms after SIGTERM, and the build succeeded.Not in this PR
The second limit, zccache's flush order and the consistency of a partial flush, is tracked upstream as zackees/zccache#1719.
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