feat: report readiness to systemd when the table registers - #26
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The unit was Type=simple, so systemd reported the service active as soon as the process started. A subagent that never reaches the AgentX master retries forever and still looks healthy, so a deployment could only tell the two apart by reading the journal for the registration line. That reading is unreliable by construction. The line is written once per connection, so on a converged host it ages out of a size-capped journal and a check for it fails against a subagent that is serving rows. It found nothing on a host whose journal holds about 25 hours while the subagent had run for 6 days. Send READY=1 on the socket in NOTIFY_SOCKET at the point the region registers, and ship the unit as Type=notify with NotifyAccess=main. "Active" now means the table is registered: systemctl start blocks until the subagent serves rows and fails at TimeoutStartSec when no master answers the retries. Consumers need no log parsing. The notification is a plain AF_UNIX datagram, so it needs no new dependency and does not change the static musl build. An absent NOTIFY_SOCKET stays a no-op for a process run outside systemd, and a failed notification is logged rather than ending a session that already registered. An abstract socket arrives with a leading @ and is addressed by name, not as a path. The shared AgentX test harness splits into master and request halves. Each test binary compiles only the half it uses, which keeps the tree free of dead-code suppressions now that a second binary shares it.
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Included review availability: Your plan provides up to 1 included review per hour; 0 remain after this review. WalkthroughThe service now uses ChangesSystemd readiness
Priority: ➖ Normal Estimated code review effort: 3 (Moderate) | ~25 minutes Change: Feature Sequence Diagram(s)sequenceDiagram
participant systemd
participant agentx-ifstack
participant AgentX master
participant notify socket
systemd->>agentx-ifstack: Start with NOTIFY_SOCKET
agentx-ifstack->>AgentX master: Register ifStackTable
AgentX master-->>agentx-ifstack: Registration succeeds
agentx-ifstack->>notify socket: Send READY=1
notify socket-->>systemd: Readiness notification
Merge Risk: ⚪ Minimal · up to The service now waits for AgentX table registration before reporting readiness and bounds failed startup retries. No concrete merge-blocking production risk is evidenced. 🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
Full details: Docstring CoverageExplanation Docstring coverage is 48.15% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 27 functions across 8 files. (2 skipped: 2 unsupported.)
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Inline comments:
In `@packaging/agentx-ifstack.service`:
- Line 13: Update the service unit’s startup failure handling around
Type=notify, TimeoutStartSec, and Restart=on-failure so a missing READY=1 causes
the initial systemctl start to fail without automatically retrying. Preserve
automatic restart behavior for crashes after successful startup, and revise the
related README claim to match the resulting behavior.
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README.mdpackaging/agentx-ifstack.servicepackaging/test_policy.pysrc/main.rssrc/notify.rssrc/session.rstests/real_namespace.rstests/support/master.rstests/support/mod.rstests/support/requests.rstests/systemd_readiness.rs
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- tests/support/mod.rs
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With Type=notify a start that never registers fails at TimeoutStartSec, and Restart=on-failure schedules another. StartLimitIntervalSec was 60s while an attempt costs TimeoutStartSec plus RestartSec, so the window reset between attempts and never counted three of them: a host with no master retried for ever. Measured on systemd 249 with a 10s window and attempts 13s apart: 6 restarts in 70 seconds and no limit. Widen the window to 10 minutes, which holds the three attempts it counts. Measured with the shipped values: attempts at 0s, 65s and 130s, then "Start request repeated too quickly" and the unit stays failed. The policy test now derives the requirement from the unit instead of pinning a number, so a change to either timeout has to keep the window wide enough. systemctl start itself was already correct: it returns at the first timeout (rc=1 after 60s, measured), so the restarts that follow do not block the caller.
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marcinpsk
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Why
The unit is
Type=simple, so systemd reports the service active as soon as the process starts. A subagent that never reaches the AgentX master retries forever and still looks healthy, so a deployment can only tell the two apart by reading the journal for theregistered ifStackTableline.That reading is unreliable by construction: the line is written once per connection, so on a converged host it ages out of a size-capped journal. This surfaced in a lifecycle pipeline, which failed provisioning against a host that was serving 269 stack rows at the time. Its journal holds about 25 hours; the subagent had been connected for 6 days, so the invocation-scoped journal was empty.
What
src/notify.rssendsREADY=1to$NOTIFY_SOCKETat the point the region registers.Type=notify,NotifyAccess=main,TimeoutStartSec=60s.systemctl startnow blocks until the subagent serves rows, and fails at the start timeout when no master answers the retries. Consumers need no log parsing. This is a behavior change: a missing master used to leave the unit active, and now fails the start (then restarts under the existing policy).The notification is a plain
AF_UNIXdatagram, so no new dependency and no change to the static musl build. An absentNOTIFY_SOCKETis a no-op outside systemd, a failed notification is logged rather than ending a session that already registered, and an abstract socket (@name) is addressed by name rather than as a path.Tests
tests/systemd_readiness.rsruns the real binary against the fake AgentX master and a real notify socket:@namesocket receives the same message,The first two fail against the unfixed tree.
packaging/test_policy.pygains a unit check forType,NotifyAccessandTimeoutStartSec.The shared AgentX harness splits into
support/master.rsandsupport/requests.rs, so each test binary compiles only the half it uses. Without that split a second binary sharing the harness needs a dead-code suppression, and the tree has none.Checks run locally
cargo fmt --check,cargo clippy --locked --all-targets -- -D warnings,cargo test --locked,python3 packaging/test_policy.py(72 passed),scripts/opengrep-scan.sh(0 findings). The privilegedreal_namespace --ignoredsuite needs root or Docker, neither available here; CI covers it.Follow-up, not in this PR
READY=1covers startup. A registration lost later (master restarted, subagent fails to re-register) still leaves the unit active.WatchdogSecplus a ping that only fires while a session holds the registration would close that too.Summary by CodeRabbit
New Features
Bug Fixes
Documentation