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fix(server): a missing agent binary no longer reads as a wrapper kill - #15344
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Merge Risk: ⚪ Minimal · up to The wrapper rejects missing or invalid targets with status 125 while preserving arguments for valid targets. No actionable merge-blocking risk remains. Architecture SummaryArchitecture risk: 🔵 Low · up to The change affects 1 system. Changed systems: Architecture concerns Review details
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| Check name | Status | Explanation |
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The title clearly and concisely describes the main fix: preventing a missing agent binary from being misreported as a wrapper kill. |
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The description is complete and follows the required sections. It explains the problem, change, scope exception, approval rationale, focused verification results, untested configuration, and the agent… |
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Review comments at @apps/server/src/provider/acp/AcpSessionRuntime.ts:
- Around line 285-290: Update the command guard in the AcpSessionRuntime wrapper
to validate the resolved target as a regular executable file, so absolute
executable paths are accepted under Bash. Keep the existing exec "$@" behavior
to preserve the command arguments.
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apps/server/src/provider/acp/AcpSessionRuntime.ts
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The Linux cgroup wrapper reserves 125 for "could not start the target" and produces it with `trap 'exit 125' 0`. That trap does not cover a failed `exec`: dash runs the EXIT trap, bash does not. Where `/bin/sh` is bash — Arch and its derivatives — a missing agent binary exits 127 instead, and the session reports the wrapper as having killed the agent rather than never having launched it. Test the target before the `exec`. The caller always hands the wrapper an absolute path — `spawnCommand.command` when it is already absolute, otherwise `resolveLinuxCgroupTargetCommand`'s result — so `[ -f ] && [ -x ]` is the whole check, and it mirrors the `statSync`/`X_OK` pair that resolver already applies on the Node side. No shell option or PATH parsing is involved, so the documented 125 holds whichever shell `/bin/sh` is. The expected behaviour is already pinned by the missing-target assertion in AcpSessionRuntime.processTree.test.ts, which fails with "expected 127 to be 125" on a bash-as-/bin/sh host without this. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
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ApprovabilityVerdict: Approved at Macroscope's review found this PR approvable — A single guard in the Linux cgroup wrapper fixes shell-dependent reporting for missing agent binaries while leaving valid launches unchanged. The scope is narrow, the intended behavior is covered by an existing regression test, and no sensitive or configuration-default changes are included. You can add or adjust custom eligibility rules. Learn more. |
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A missing agent binary must return exit 125 from the Linux cgroup wrapper. An EXIT trap alone returned 127 when /bin/sh was Bash. The wrapper now verifies that the absolute target is a regular executable file before exec, preserving arguments and child exit codes.
Updated with main after the runtime moved to packages/provider-acp. The existing process-tree regression test remains in apps/server.
Verification on Linux: the actual wrapper returned 125 for missing targets and directories under both Bash and Dash, preserved argv and stdout, and preserved a child exit of 42 (eight direct runtime checks). Blacksmith: all 23 existing process-tree tests passed, affected-file lint passed with zero warnings/errors, and provider-acp typecheck passed (existing Effect suggestions only). Two independent source reviewers approved bdc0441.
Original reproduction: CachyOS (Arch), GNU Bash 5.3.20 as /bin/sh; the existing process-tree suite changed from 1 failed / 22 passed to 23 passed.
Follow-up work by gpt-6.1-sol through the Codex harness in T3 Code on behalf of Maria. Original contribution by Moinax, assisted by Claude Opus 5 in T3 Code.