fix(control): recover missing Herdr endpoints on relaunch - #2770
fix(control): recover missing Herdr endpoints on relaunch#2770khaira777 wants to merge 20 commits into
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Confidence Score: 5/5The PR appears safe to merge because no blocking failure remains within the eligible follow-up scope. No blocking failure remains. Reviews (3): Last reviewed commit: "no-mistakes(document): Clarified relaunc..." | Re-trigger Greptile |
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| # A previous missing-endpoint recovery can leave its replacement pane | ||
| # structurally present but agent-free after the launch fails. The control | ||
| # plane authorizes this path only from that recorded recovery journal; | ||
| # accepting the recovery-grade dead state here is therefore safe and | ||
| # avoids stranding the same task behind an empty Herdr pane. |
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Captain, when fm-spawn.sh <id> --relaunch --recover-missing is invoked directly for any stopped Herdr task, this branch accepts dead solely because the flag was supplied; it never verifies SPAWN_CONTROL_PARENT, a matching relaunch transaction, or the claimed failed-recovery journal. The caller can therefore create and publish a new pane while bypassing fm-control's checkpoint, required progress note, and transactional rollback, even though the comment says the control plane authorized this path. Refuse --recover-missing unless it comes from the lifecycle-control parent with matching recovery provenance.
AGENTS.md reference: AGENTS.md:L302-L305
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| if [ "$BACKEND" = herdr ] \ | ||
| && { [ "$state" = missing ] \ | ||
| || { [ "$state" = dead ] \ | ||
| && [ -f "$JOURNAL" ] \ | ||
| && grep -Fqx 'phase=failed:launching' "$JOURNAL" 2>/dev/null; }; }; then |
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When an ordinary same-endpoint Herdr relaunch publishes its replacement record but the new agent never becomes alive, rollback also leaves a dead pane and phase=failed:launching. This predicate cannot distinguish that ordinary failure from a failed missing-endpoint recovery, so the next fm-control ... relaunch incorrectly passes --recover-missing, creates another pane, and abandons the still-valid agent-free endpoint instead of retrying it. Persist and check an explicit recovery-attempt marker rather than inferring provenance from backend, state, and phase alone.
AGENTS.md reference: AGENTS.md:L302-L305
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Speaking as Kun's firstmate: VISION: aligned as a failure-mode recovery. A restart is a non-event; a gone Herdr endpoint should not strand relaunch. The path is fail-closed on live/ambiguous endpoints, scoped to Herdr, and leaves the ordinary tmux same-endpoint retry alone. Class: corrective (default relaunch recovery for that Herdr-missing shape; no enable flag). Defect, waiting on the author: the recovery cwd wait is: bash Security: none. Overlap / do not land together:
CI: first-time fork workflows approved after diff review. Greptile is green. no-mistakes is pending and blocking. Ahead 1, behind 0, mergeable. Waiting on the author for the wait-loop defect, and on CI — not waiting on the captain. Merge-eligible: NO. Captain-flag NOW: NO. |
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Speaking as Kun's firstmate: Corrective Herdr-only relaunch recovery for an authoritatively gone endpoint ( Not merge-eligible. Require no-mistakes FAILED (body compliance). CI in progress. Overlap with #2760 on Waiting on the author for no-mistakes — not waiting on the captain. |
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…points A recorded Herdr endpoint that is authoritatively gone (app restart) stranded relaunch: the ordinary path requires a positively agent-free endpoint to adopt. fm-control relaunch now detects a missing endpoint, or an agent-free one with a failed:launching journal from a prior attempt (Herdr records only, so an ordinary tmux retry keeps its same-endpoint path), skips the stopping step, and delegates to fm-spawn --relaunch --recover-missing. The launch rebuilds exactly one replacement pane in the recorded session/workspace - or the home's flat workspace when that workspace is gone too - reuses the task's existing local copy and records, adopts the rebuilt pane into the durable record, and refuses live or ambiguous endpoints instead of risking duplicate recovery. Ship/scout kinds only; secondmates keep their own recovery.
…rable attempt marker fm-spawn now refuses --recover-missing unless the caller is a live fm-control relaunch child (control lock naming our parent plus the relaunch transaction id) or fm-control's recovery-attempt marker authorizes finishing a failed attempt, so an endpoint rebuild can no longer be requested outside the control plane. fm-control persists that marker before delegating a recovery launch and removes it once the replacement is confirmed alive; the dead-endpoint recovery predicate now requires the marker instead of inferring from the failed:launching journal shape, so an ordinary failed relaunch retry stays on the ordinary same-endpoint path. Also fixes the recovery cwd wait's left-associative ||/|| chain that broke on an empty first path read; it now breaks only on a positive settled-path conjunction.
…and add marker to teardown cleanup
…ndpoint recovery routing on the recovery-attempt marker
… a case statement
…e-endpoint relaunch
…accuracy across owners
…out kinds with regression test
…y retry regression
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khaira777
changed the title
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Update for @kunchenguid - the pipeline has now completed fully end-to-end on this PR, with your required flow honored:
Ready for your safe review and merge whenever you are - we'll keep watching for any further comments. |
2 participants
Intent
Finish and land the recover-missing relaunch feature for gone Herdr endpoints in firstmate: bin/fm-control.sh relaunch must recover a recorded Herdr endpoint that reads missing (or dead after a failed fm-control recovery, proven by a durable recovery-attempt marker) by delegating to bin/fm-spawn.sh --recover-missing, which rebuilds exactly one replacement pane in the recorded Herdr session/workspace (or the home's flat workspace) while keeping the task's existing local copy, durable record, and validation ownership - never a fresh spawn, never a second worktree. fm-spawn reserves --recover-missing for control-plane provenance only (live fm-control relaunch parent with the transaction id, or the recovery-attempt marker), requires ship/scout kind, accepts only recovery-grade missing-or-dead endpoint states, and refuses ambiguous or suddenly-live endpoints rather than risking duplicate recovery. Ordinary relaunch behavior for present-but-agent-free endpoints is unchanged. Review findings P1 (control-plane authorization gate) and P2 (explicit recovery-attempt marker persistence so an ordinary failed relaunch is never mistaken for a failed missing-endpoint recovery) plus the fixed empty-first-read cwd wait are implemented on this branch; both scripts must stay shellcheck-clean with colocated regression tests.
What Changed
fm-control relaunchrecovery for recorded Herdr endpoints that are missing or durably marked dead, delegating replacement creation tofm-spawn.sh --recover-missingwhile preserving the task’s existing workspace, durable record, and validation ownership.--recover-missingto authorized control-plane recovery provenance and ship/scout endpoints in recovery-grade states, with pane reconstruction and cwd-readiness handling for Herdr sessions.Risk Assessment
🚨 High: Unauthorized callers can authorize replacement-pane recovery and risk duplicate task ownership.
Testing
Fresh focused regression tests passed for missing/dead recovery, authorization gates, workspace fallback, live/ambiguous refusal, marker persistence, ordinary relaunch behavior, and empty-first-cwd settling. The isolated end-to-end transcript confirms one replacement pane in the recorded worktree with the recovery marker cleared. No linters or static analysis were run per phase rules.
Evidence: End-to-end missing Herdr endpoint recovery transcript
Pipeline
Updates from git push no-mistakes
✅ **intent** - passed
✅ No issues found.
✅ **Rebase** - passed
✅ No issues found.
bin/fm-spawn.sh:1037- Required criterion says--recover-missingmust accept a “live fm-control relaunch parent with the transaction id.” At lines 1033-1043, the parent check only substring-matchesfm-control.shandrelaunchinpsoutput; a non-control wrapper can hold the task lock, include those strings in its argv, and pass the matching transaction environment, authorizing an unauthorized replacement pane. Authenticate the parent/transaction at the shared control-lock boundary rather than relying on spoofable command-line text.🔧 Fix: Bind recovery authorization to the shared control lock role
1 error still open:
bin/fm-control.sh:270- The required criterion limits authorization to a “live fm-control relaunch parent with the transaction id,” but this hunk labels every control verb’s lock ascontrol-relaunch, includinginterruptandexit. A direct child of those live control processes can therefore satisfy fm-spawn’s role check with a matching transaction. Bind this role only forrelaunch.🔧 Fix: Scope control-lock authorization to relaunch only
2 issues (1 error, 1 warning) still open:
bin/fm-spawn.sh:1941- The required criterion says an endpoint that turns live between checks must be refused. After the initial missing-state checks, the fallback at lines 1941-1959 can recreate the recorded workspace/pane while the old endpoint concurrently reappears live; it never revalidates the original endpoint before creating the replacement, so two agents can be launched for one task. Recheck the original endpoint at the shared Herdr recovery boundary (and refuse if live/ambiguous) before replacement creation.bin/fm-spawn.sh:1044- A marker-authorized directfm-spawn --relaunch --recover-missingis accepted at lines 1044-1045, but onlyfm-control.shclears the marker after its liveness wait. A successful direct recovery therefore leaves the marker behind; if that later agent becomes dead,fm-control.shtreats it as a failed recovery and rebuilds another pane instead of following ordinary same-endpoint relaunch semantics. Make marker completion ownership explicit: either verify-and-clear it in the direct recovery path or refuse marker-authorized direct completion outsidefm-control.🔧 Fix: Harden Herdr recovery races and marker completion
1 error still open:
bin/fm-spawn.sh:1042---recover-missingdoes not authenticate that the lock owner is actuallybin/fm-control.sh; a same-user wrapper can forge the lock role and matching transaction, then invokefm-spawnas its child. This bypasses the required control-plane-only gate and risks duplicate recovery. Use an authorization capability only the control-plane path can present.✅ **Test** - passed
✅ No issues found.
bash tests/fm-control-relaunch.test.shIsolated stateful Herdr recovery fixture with persisted metadata and replacement-pane assertionsFinalgit statusand target diff inspection✅ **Document** - passed
✅ No issues found.
✅ **Lint** - passed
✅ No issues found.
✅ **Push** - passed
✅ No issues found.