fix(bg): preserve detached session terminal outcomes - #2133
kevincodex1 merged 2 commits into
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🧠 Learnings (1)📚 Learning: 2026-08-07T01:57:07.096ZApplied to files:
🪛 ast-grep (0.45.1)src/cli/bg.ts[warning] Importing child_process exposes a command-execution surface; ensure any command/argument built from input is validated, and prefer execFile/spawn with an argument array over exec. (detect-child-process-typescript) [warning] Importing child_process exposes a command-execution surface; ensure any command/argument built from input is validated, and prefer execFile/spawn with an argument array over exec. (detect-child-process-typescript) [warning] Importing child_process exposes a command-execution surface; ensure any command/argument built from input is validated, and prefer execFile/spawn with an argument array over exec. (detect-child-process-typescript) 🔇 Additional comments (10)
📝 WalkthroughWalkthroughBackground sessions now persist terminal facts for exits, signals, explicit kills, and stale processes. Child processes install a finalizer that records outcomes. Launches propagate session identity and confirm immediate termination. Signal tracking covers graceful shutdown paths. ChangesBackground session terminal facts
Estimated code review effort: 4 (Complex) | ~60 minutes Merge Risk: 🔵 Low · up to The change improves background-session outcome reporting by preserving exited, failed, and killed states instead of incorrectly showing stale. It is mergeable with owner awareness because failed launch confirmation may leave session and log artifacts behind, and one integration test depends on a prebuilt launcher and node being available on PATH. Suggested reviewers: 🚥 Pre-merge checks | ✅ 6 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (6 passed)
✨ Finishing Touches🧪 Generate unit tests (beta)
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Actionable comments posted: 12
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Inline comments:
In `@README.md`:
- Around line 188-194: Update the session status documentation in README.md to
state that an explicit successful kill takes precedence over a natural exited or
failed outcome for the same process, and that terminal outcomes are stored
separately under bg-sessions/terminal/. Note that deleting this directory causes
finished sessions to fall back to liveness-derived status.
In `@src/cli/bg.test.ts`:
- Around line 535-569: Extend the tests for confirmBackgroundSessionLaunch to
cover both success paths: verify a live process returns the original session
without calling refreshStatuses or resolveSession, and verify a dead process
with an already-finalized terminal session returns the resolved exited or failed
session, including its terminal status and exit details.
In `@src/cli/bg.ts`:
- Around line 944-960: Update the handleBgFlag failure path around
confirmBackgroundSessionLaunch so a stale-session confirmation removes the
created registry record and log files before reporting failure, matching the
cleanup used by other launch failures; do not attempt child termination because
the process has already exited. If the implementation intentionally retains the
record or logs for postmortem inspection, explicitly state that in the surfaced
error message instead.
- Around line 66-71: Update the background launcher constants near HEAP_SIZE_ENV
to reuse the exported BACKGROUND_SESSION_ID_ENV and
BACKGROUND_SESSION_LAUNCHER_PID_ENV symbols from bgFinalizer instead of
redeclaring them; if that import creates an unacceptable cycle or dependency,
move both constants to a shared module and import them from both consumers.
- Around line 226-238: Update the non-Node branch in the environment setup
around isNodeExecutable so the launcher receives a relaunch marker or otherwise
skips its relaunch path. Preserve the originally registered detached PID for
non-Node runtimes and ensure prepareBackgroundSessionFinalizer runs in that same
owning process.
In `@src/cli/bgFinalizer.test.ts`:
- Around line 481-512: Update the test setup around runBuiltCliSession and the
installedLauncherPath spawn to verify the prebuilt launcher exists and is
runnable, guarding or skipping the test when it is unavailable; use
process.execPath instead of the literal node command. Replace the
spacing-sensitive stdout assertions with checks for the relevant process names
and outcome status without coupling them to print.ts column formatting.
- Around line 427-457: Guard the signal-dependent tests in
src/cli/bgFinalizer.test.ts lines 427-457, including the parameterized sigint
and sigterm cases, with it.skipIf(process.platform === 'win32'). Apply the same
Windows platform guard to the SIGKILL destruction test in
src/cli/bgFinalizer.test.ts lines 514-526; no other test behavior needs
changing.
- Around line 203-213: Update the process.exitCode assignment in this test to
use a narrow cast for the string value while preserving the test’s
string-parsing coverage and existing cleanup behavior.
In `@src/cli/bgRegistry.test.ts`:
- Around line 33-53: Add negative tests in bgRegistry.test.ts for
isBackgroundSessionTerminalFact rejection, covering a terminal fact with a
mismatched pid and at least one malformed status/exitCode combination such as
killed with exitCode. Verify rejected facts leave the session status as running
and do not expose exitCode, using the existing writeTerminalFact,
createBackgroundSession, listBackgroundSessions, and resolveBackgroundSession
helpers.
- Around line 940-980: Rename the production seam option on
refreshBackgroundSessionStatuses from beforeStatusWrite to
_beforeStatusWriteForTesting, and update the test to use the renamed property
while preserving the existing race orchestration and assertions.
In `@src/cli/bgRegistry.ts`:
- Around line 1028-1041: The defensive ineligibility guard in the finalization
logic is unreachable for current BackgroundSessionStatus values; add a brief
comment at the guard explaining that it is intentionally retained to catch
future status additions. Apply the same clarification to both finalizer
branches.
- Around line 571-598: Update ensureBackgroundSessionDirs or the existing
session-pruning flow to remove stale terminal fact files matching the temporary
*.tmp naming pattern, covering files left behind when either installer process
exits before finally cleanup. Preserve active installation behavior and avoid
deleting non-temporary terminal facts.
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**/*.{ts,tsx}
📄 CodeRabbit inference engine (AGENTS.md)
Use TypeScript strict mode and ESM imports throughout the source code.
Run
bun run typecheckandbun run typecheck:type-testsfor TypeScript changes when applicable.
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src/cli/bgFinalizer.fixture.tssrc/utils/backgroundSessionTermination.tssrc/cli/print.tssrc/utils/gracefulShutdown.tssrc/entrypoints/cli.test.tssrc/entrypoints/cli.tsxsrc/cli/bg.test.tssrc/cli/bgFinalizer.tssrc/cli/bgFinalizer.test.tssrc/cli/bgRegistry.test.tssrc/cli/bg.tssrc/cli/bgRegistry.ts
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Usechalkfor terminal color andexecafor child-process execution when those capabilities are needed.
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Update documentation when setup, commands, or user-facing behavior changes.
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🧠 Learnings (2)
📚 Learning: 2026-08-07T01:57:07.096Z
Learnt from: CR
Repo: Gitlawb/openclaude PR: 0
File: AGENTS.md:0-0
Timestamp: 2026-08-07T01:57:07.096Z
Learning: Applies to **/*.{test,spec}.{ts,tsx} : Add or update tests when behavior changes, and run the narrowest useful focused test checks.
Applied to files:
src/cli/bg.test.tssrc/cli/bgFinalizer.test.tssrc/cli/bgRegistry.test.ts
📚 Learning: 2026-08-07T01:57:16.417Z
Learnt from: CR
Repo: Gitlawb/openclaude PR: 0
File: CONTRIBUTING.md:0-0
Timestamp: 2026-08-07T01:57:16.417Z
Learning: Applies to **/*.{test,spec}.{ts,tsx,js,jsx} : Add or update tests when a code change affects behavior.
Applied to files:
src/cli/bg.test.ts
🪛 ast-grep (0.45.1)
src/cli/bgFinalizer.test.ts
[warning] 466-468: Regular expression constructed from variable input detected. This can lead to Regular Expression Denial of Service (ReDoS) attacks if the variable contains malicious patterns. Use libraries like 'recheck' to validate regex safety or use static patterns.
Context: new RegExp(
(?:Started background session ${session.id}\\.|Background session ${session.id} finished with status ${expectation.status}\\.),
)
Note: [CWE-1333] Inefficient Regular Expression Complexity
(regexp-from-variable)
[warning] 1-1: Importing child_process exposes a command-execution surface; ensure any command/argument built from input is validated, and prefer execFile/spawn with an argument array over exec.
Context: import { spawn } from 'node:child_process'
Note: [CWE-78] Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection').
(detect-child-process-typescript)
src/cli/bg.ts
[warning] Importing child_process exposes a command-execution surface; ensure any command/argument built from input is validated, and prefer execFile/spawn with an argument array over exec.
Context: import { spawn } from 'node:child_process'
Note: [CWE-78] Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection').
(detect-child-process-typescript)
[warning] Importing child_process exposes a command-execution surface; ensure any command/argument built from input is validated, and prefer execFile/spawn with an argument array over exec.
Context: import { spawn } from 'node:child_process'
Note: [CWE-78] Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection').
(detect-child-process-typescript)
[warning] Importing child_process exposes a command-execution surface; ensure any command/argument built from input is validated, and prefer execFile/spawn with an argument array over exec.
Context: import { spawn } from 'node:child_process'
Note: [CWE-78] Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection').
(detect-child-process-typescript)
[warning] Importing child_process exposes a command-execution surface; ensure any command/argument built from input is validated, and prefer execFile/spawn with an argument array over exec.
Context: import { spawn } from 'node:child_process'
Note: [CWE-78] Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection').
(detect-child-process-typescript)
[warning] Importing child_process exposes a command-execution surface; ensure any command/argument built from input is validated, and prefer execFile/spawn with an argument array over exec.
Context: import { spawn } from 'node:child_process'
Note: [CWE-78] Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection').
(detect-child-process-typescript)
[warning] Importing child_process exposes a command-execution surface; ensure any command/argument built from input is validated, and prefer execFile/spawn with an argument array over exec.
Context: import { spawn } from 'node:child_process'
Note: [CWE-78] Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection').
(detect-child-process-typescript)
[warning] Importing child_process exposes a command-execution surface; ensure any command/argument built from input is validated, and prefer execFile/spawn with an argument array over exec.
Context: import { spawn } from 'node:child_process'
Note: [CWE-78] Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection').
(detect-child-process-typescript)
[warning] Importing child_process exposes a command-execution surface; ensure any command/argument built from input is validated, and prefer execFile/spawn with an argument array over exec.
Context: import { spawn } from 'node:child_process'
Note: [CWE-78] Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection').
(detect-child-process-typescript)
🔇 Additional comments (15)
src/cli/bgRegistry.ts (3)
443-495: LGTM!
969-1005: LGTM!Also applies to: 1083-1106
525-562: 🗄️ Data Integrity & IntegrationNo status consumer bypasses authoritative terminal facts. Background-session commands consume results from
listBackgroundSessions()orrefreshBackgroundSessionStatuses(). The raw metadata reader is limited to ownership and finalization checks.> Likely an incorrect or invalid review comment.src/cli/bgRegistry.test.ts (1)
662-679: LGTM!Also applies to: 681-797, 799-938, 982-1090, 1202-1211
src/cli/bgFinalizer.test.ts (2)
53-107: LGTM!Also applies to: 134-158, 160-214, 216-261, 263-295
466-470: 📐 Maintainability & Code QualityStatic analysis hint dismissed.
The
RegExpis built fromsession.id, which the registry generates and validates againstSAFE_ID_RE, and from a literal status string. No untrusted input reaches the pattern, so the ReDoS warning does not apply here.Source: Linters/SAST tools
src/cli/bg.ts (1)
176-213: LGTM!Also applies to: 1058-1059, 1105-1105
src/cli/bg.test.ts (1)
457-511: LGTM!src/entrypoints/cli.test.ts (1)
40-40: LGTM!Also applies to: 78-78, 339-342, 436-452
src/cli/bgFinalizer.ts (1)
1-233: LGTM!src/utils/backgroundSessionTermination.ts (1)
1-27: LGTM!src/utils/gracefulShutdown.ts (1)
38-38: LGTM!Also applies to: 271-282
src/cli/print.ts (1)
19-19: LGTM!Also applies to: 1215-1215
src/cli/bgFinalizer.fixture.ts (1)
1-36: LGTM!src/entrypoints/cli.tsx (1)
249-252: LGTM!Also applies to: 280-280, 317-328
UpdatePushed follow-up commit 2978515 addressing the background-session review feedback. Addressed
Not changed
|
Migrate fork from the bg.js daemon-based bg architecture (commit 98d8715, T12.2 of bg-agent-view) to upstream's full bg.ts + bgRegistry.ts + bgFinalizer.ts + bgRouting.ts + backgroundSessionTermination.ts architecture (introduced upstream in Twigpine#1642, hardened by Twigpine#2133). New files (from upstream/main): src/cli/bg.ts (1136 lines) src/cli/bg.test.ts (1324 lines) src/cli/bgRegistry.ts (1125 lines) src/cli/bgRegistry.test.ts (1555 lines) src/cli/bgFinalizer.ts ( 238 lines) src/cli/bgFinalizer.test.ts ( 541 lines) src/cli/bgFinalizer.fixture.ts ( 36 lines) src/cli/bgRouting.ts ( 4 lines) src/utils/backgroundSessionTermination.ts ( 27 lines) Modified (apply Twigpine#2133's hunks): README.md, src/cli/print.ts, src/entrypoints/cli.tsx, src/utils/gracefulShutdown.ts Deleted (fork's old daemon-based bg, replaced by upstream's session-registry model): src/cli/bg.js (was fork's bg.js; 205 lines) src/cli/bg.test.js (was fork's bg.test.js; 484 lines) Fork-local additions to support the migrated bg.ts without dragging in upstream's full CLI machinery (which depends on envFile, flagSettings, githubModelsCredentials, interruptionTrace, daemon, templateJobs, etc. that the fork doesn't carry): src/utils/cliArgs.ts — add argsBeforeDelimiter() (mirrors upstream helper for handling `--` delimiter in argv) src/utils/conversationRecovery.ts — add findResumeSessionIdByPrSelector() (used by bg.ts's --bg pr-resume path) Minimal cli.tsx wiring (instead of upstream's full CliEntrypointImporters machinery, the fork keeps its existing main() and just installs the bg finalizer at the top when the private BACKGROUND_SESSION_ID_ENV / BACKGROUND_SESSION_LAUNCHER_PID_ENV vars are set): src/entrypoints/cli.tsx — at start of main(), import bgRouting + bgFinalizer and call prepareBackgroundSessionFinalizer() if either env var is set src/utils/gracefulShutdown.ts — add noteBackgroundSessionTerminationSignal() to SIGINT / SIGTERM / SIGHUP handlers so the finalizer can record the real exit signal Verification: bun run typecheck → 0 errors bun test src/cli/bg.test.ts → 51 pass / 0 fail bun test src/cli/bgRegistry.test.ts → 60 pass / 0 fail bun test src/cli/bgFinalizer.test.ts → 9 fail (integration tests; see "Known limitations" below) bun run build → OK bun test (full suite) → 5078 pass / 167 skip / 16 fail (7 fail are origin/main-opencc pre-existing baseline: modelRouteOverrides × 3, filesystem permissions × 2, client baseURL × 2; 9 fail are bgFinalizer integration tests) Known limitations: 1. bgFinalizer.test.ts has 9 integration test failures because the test fixtures spawn real detached CLI subprocesses (using OPENCLAUDE_BG_FINALIZER_FIXTURE_READY env var and a per-test config dir), which depend on infrastructure the fork doesn't carry (the full envFile / flagSettings / githubModelsCredentials / interruptionTrace / daemon stack that upstream's cli.tsx has). The tests are kept as placeholders for the future port of that machinery. 2. Fork's --bg now goes through upstream's session-registry model (--bg-session-id env var, registry under ~/.claude/sessions/) instead of the old daemon request socket flow. The fork's previous T12.2 daemon command surface (handleBgAgentsCommand → /bg-agents subcommand) is still available but the new `--bg <short-id>` re-launch path is the one bg.js callers used to use. Co-Authored-By: Claude <noreply@anthropic.com>
…g + 5 upstream fixes) # Conflicts: # src/utils/conversationRecovery.ts
The v1 daemon-mailbox data path (BG_PROTO list/kill ops over the bg daemon socket) was inherited from the original bg-agent-view plan (T8/T9). When fork commit 1439579 ported `--bg` to the v2 session-registry model (upstream Twigpine#1642 hardened by Twigpine#2133), the dialog was left reading the v1 mailbox — which is empty for every session that came through the v2 path. `opencc ps` showed 7+ sessions; `/background` showed "No background agents". Replace the data layer with direct bgRegistry calls: - `loadJobs` → `loadSessions` (uses refreshBackgroundSessionStatuses + listBackgroundSessions; sessions are sorted startedAt desc) - `killJob` → `killSession` (uses killBackgroundSession from bg.ts) - `useBackgroundAgentJobs` → `useBackgroundAgentSessions` - `setBackgroundAgentSockPathForTesting` → `setBackgroundAgentRegistryRootForTesting` (wraps `_setBackgroundSessionsRootForTesting`) The BackgroundAgentRow renderer is unchanged — `sessionToJob` adapts the v2 BackgroundSession shape into the v1 JobRecord shape (session.id → job.short, isTerminal(session) → job.dying, etc.) so the pointer + short + cwd + status + isolation row layout is preserved across the v1 → v2 switch. Tests: - Removed the fake-daemon-server harness (loopback unix socket + FrameReader/encoder + ~150 lines of net.createServer glue) - Switched to mocking `_setBackgroundSessionsRootForTesting` and writing sessions directly to `~/.claude/bg-sessions/sessions/`, matching the pattern in `bgRegistry.test.ts`. - 8/8 tests pass. Default pid in fixtures is `process.pid` so the refresh path doesn't demote `running` sessions to `stale`. Ported from opencc-release `93029117`. Out of scope: `claude bg-agents` CLI subcommand still reads the v1 daemon mailbox (CLI surface, not the TUI dialog).
3 participants
Summary
killedstronger than naturalexited/failedand natural facts stronger than liveness-derivedstale;This fixes short-lived successful and failed background jobs becoming indistinguishable as
staleafter their processes exit.I reviewed
CONTRIBUTING.mdandAGENTS.mdbefore submitting this change.Impact
openclaude pseventually reports normal completion asexited, nonzero or observed top-level failure asfailed, verified explicit termination askilled, and unobservable loss conservatively asstale;Terminal evidence
mainstalestaleexitedfailedThe changed build also preserved the jobs' original process exit codes.
Testing
bun run buildbun run smokebun run checkbun run typecheckbun run typecheck:type-testsbun run security:pr-scan -- --base upstream/main --head HEADgit diff --check upstream/main...HEADbun test src/cli/bgRegistry.test.ts src/cli/bg.test.ts src/cli/bgFinalizer.test.ts src/entrypoints/cli.test.ts src/utils/conversationRecovery.test.ts(179 passed)Focused coverage includes exit 0, nonzero exit, uncaught top-level failure, observed SIGINT/SIGTERM, SIGKILL-to-stale, exact owner rejection, PID 1 container launch, registration timeout, launcher-death registration races, refresh/finalizer races, kill/finalizer races, concurrent natural writers, name release, persistence failure, old metadata, the installed launcher, and built
psoutput.Notes
stalewhen the process cannot authoritatively observe its outcome. Signal names are not inferred where the platform cannot report them.Summary by CodeRabbit
New Features
exited,failed,stale, orkilled.Bug Fixes
Documentation