fix(minimald): return from exec when the child exits, not when its pipes close by norrietaylor · Pull Request #1342 · gominimal/minimal

norrietaylor · 2026-09-02T19:13:39Z

Closes gominimal/inbox#566.

The bug

bridge_one ended its I/O loop only when both child stdout and stderr hit EOF, then reaped the child. A grandchild that inherited those fds holds the write ends open past the child's own exit, so the loop ran for as long as the grandchild lived:

$ min session exec web 'sleep 20 & echo STARTED'
STARTED
# ...blocks for 20s

The trigger is fd inheritance, not backgrounding — nohup sleep 20 >/dev/null 2>&1 & already returned instantly, because the redirects mean nothing inherits the pipes.

The fix

process.wait() becomes a fourth select! branch, so the loop ends on the first of: both streams at EOF, the child exiting, or an SSH-channel write failing.

On child exit we drain what is already buffered, return the exit code, and hand any still-open read end to a detached drain-and-discard task. That last part is load-bearing rather than tidy: dropping the read end would point the orphan's next write at a pipe with no reader, and SIGPIPE would kill the backgrounded service on its first log line. That converts a visible 20s hang into a silent death, in exactly the use case people background things for.

The drain's stopping condition

The drain stops when the pipe stays quiet for 100 ms, rather than after a single now_or_never poll. This distinction dec 8000 ides whether the fix is correct at all:

tokio learns a pipe is readable from a reactor turn. A lone now_or_never issued on the turn where wait() resolved can report "would block" for a pipe that already holds the child's output — which would silently truncate min session exec echo hi, the most common command there is. A mock-based test can't catch it either: duplex makes writes readable without a reactor turn, so the race structurally cannot reproduce there.

The grace is only ever paid when a grandchild really is holding the write end. With no grandchild, EOF is already pending and the read returns at once. Measured by raising the constant to 2500 ms:

Test	100 ms grace	2500 ms grace
`end_to_end::exec_runs_echo_task` (real process)	0.094 s	0.094 s
`bridge_returns_on_child_exit_with_stdout_still_held_open`	0.105 s	2.505 s

The ordinary path never touches it.

Why the race in `select!` is harmless

The branches stay unbiased, so wait can win against readable output; the post-loop drain is what makes that safe. Nothing is lost to cancellation either way — read is cancel-safe, and the SSH writes live in branch handlers, which run after the select! has already resolved.

To make wait a branch at all, the two SSH-write-failure handlers no longer call process.start_kill() inline (that would contend with the &mut process wait holds across the select!); they set a flag and the kill happens after the loop, where process is free. The child is still killed for the same reason as before.

Scope

The daemon's direct child is the nsenter shim, which itself blocks in Child::wait on the session shell (crates/minimald/src/nsenter.rs), so "the child exited" already means "the user's command finished". Pipelines and foreground jobs are waited on by that shell and are unaffected. min task run and min session run share bridge_one through ExecTask::run and get the same fix.

The trade — a grandchild's output written after we return is discarded — is now documented in docs/reference/cli-min.md under a new "Backgrounding a command" subsection, along with the nohup cmd >/dev/null 2>&1 & detach idiom.

Test

bridge_returns_on_child_exit_with_stdout_still_held_open signals exit while still holding the stdout writer, then writes 256 KiB through it — proving both that the bridge returned and that the orphan's writes still land somewhere rather than taking EPIPE. Every pre-existing test drops the writers before signalling exit, which is precisely why none of them caught this.

Note on the issue text

The issue also described an argv re-evaluation defect. That one is already fixed on main by 8c51722 (fix(exec)!: tag exec-channel requests instead of sniffing the string); nothing here re-addresses it.

Verification

cargo clippy -p minimald --all-targets clean, cargo fmt --check clean, all 14 exec:: tests pass locally. Leaving the full matrix to CI.

🤖 Generated with Claude Code

Summary by CodeRabbit

Bug Fixes
- Commands now return promptly when the underlying process exits, even if inherited output streams remain open.
- Output produced before exit is preserved, while lingering output is safely discarded in the background.
- SSH write failures now terminate the associated command instead of leaving it running.
Documentation
- Added guidance and examples for running commands in the background with session exec.
- Documented output-discard behavior after command completion and clarified applicability to session run and task run.

…pes close `bridge_one` ended its I/O loop only when both child stdout and stderr hit EOF, then reaped the child. A grandchild that inherited those fds holds the write ends open past the child's own exit, so the loop kept running for as long as the grandchild lived: `min session exec web 'sleep 20 & echo STARTED'` blocked the caller for 20s. The trigger is fd inheritance, not backgrounding — `nohup sleep 20 >/dev/null 2>&1 &` already returned instantly. `process.wait()` is now a fourth `select!` branch, so the loop ends on the first of: both streams at EOF, the child exiting, or an SSH-channel write failing. On child exit we drain what is already buffered, return the exit code, and hand any still-open read end to a detached drain-and-discard task. That last step is load-bearing: dropping the read end would point the orphan's next write at a pipe with no reader, and SIGPIPE would kill the backgrounded service on its first log line — turning a visible hang into a silent death. The branches stay unbiased, so `wait` can win a race against readable output; the post-loop drain is what makes that harmless. Nothing is lost to `select!` cancellation either way — `read` is cancel-safe, and the SSH writes live in branch handlers, which run after the `select!` has already resolved. That drain stops when the pipe stays quiet for 100ms, rather than after a single `now_or_never` poll. The distinction decides whether the fix is correct: tokio learns a pipe is readable from a reactor turn, so a lone poll issued on the turn where `wait()` resolved can report "would block" for a pipe that already holds the child's output, silently truncating `min session exec echo hi`. The grace is only ever paid when a grandchild really is holding the write end — with no grandchild, EOF is already pending and the read returns at once. Measured: raising the constant to 2500ms leaves the real-process echo test at 0.09s and moves only the held-open test, to 2.5s. To make `wait` a branch, the two SSH-write-failure handlers no longer call `process.start_kill()` inline (which would have contended with the `&mut process` that `wait` holds across the `select!`); they set a flag and the kill happens after the loop, where `process` is free. The child is still killed for the same reason as before. The direct child is the `nsenter` shim, which itself blocks in `Child::wait` on the session shell, so "the child exited" already means "the user's command finished"; pipelines and foreground jobs are waited on by that shell and are unaffected. `min task run` and `min session run` share `bridge_one` through `ExecTask::run` and are fixed by the same change. The trade — a grandchild's output after we return is discarded — is now documented, along with the `nohup cmd >/dev/null 2>&1 &` detach idiom. The regression test signals exit while still holding the stdout writer, which is exactly what every existing test avoids doing (they all drop the writers first), and is why none of them caught this. Closes: gominimal/inbox#566 Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

coderabbitai · 2026-09-02T19:14:52Z

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📝 Walkthrough

Walkthrough

The SSH execution bridge now returns when the foreground child exits. It briefly drains buffered output and discards later output from inherited pipes in background tasks. Regression coverage and CLI documentation describe the behavior for session and task commands.

Changes

SSH execution bridge

Layer / File(s)	Summary
Exit-aware bridge control flow `crates/minimald/src/exec.rs`	`bridge_one` monitors child exit during SSH I/O, preserves the exit result, and terminates the child after SSH write failure.
Post-exit output handling `crates/minimald/src/exec.rs`, `docs/reference/cli-min.md`	The bridge drains buffered output for a bounded period, discards later orphan output, and tests inherited stdout pipes. CLI documentation covers backgrounding and detachment behavior.

Estimated code review effort: 4 (Complex) | ~45 minutes

Merge Risk: 🟡 Moderate · up to 58ee8

The change makes backgrounded commands return promptly, but indefinitely open inherited pipes can accumulate detached drain tasks and file descriptors, potentially exhausting daemon resources under repeated use. Merge should wait for a resource bound or explicit owner acceptance; minor documentation fixes are also pending.

Suggested reviewers: twitchyliquid64

Sequence Diagram(s)

sequenceDiagram
  participant SSHChannel
  participant bridge_one
  participant ChildProcess
  participant DrainTask
  SSHChannel->>bridge_one: exchange stdin and stdout/stderr
  bridge_one->>ChildProcess: monitor exit
  ChildProcess-->>bridge_one: return exit status
  bridge_one->>DrainTask: transfer open pipe readers
  DrainTask-->>bridge_one: discard later orphan output
  bridge_one-->>SSHChannel: return exit status and buffered output

Poem

A rabbit hops where pipe streams flow
The child exits; the bridge can go
Buffered bytes are gathered near
Orphaned echoes disappear
SSH paths now end on time

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly and concisely describes the primary minimald exec behavior change and follows the required Conventional Commit format.
Description check	✅ Passed	The description explains the bug, fix, scope, testing, documentation impact, and separate argv issue. It does not use the template headings or checklist, but it provides the required information in eq…
Linked Issues check	✅ Passed	The changes satisfy issue `#566` by returning when the child exits, preserving buffered output, preventing SIGPIPE termination through detached draining, and documenting the detach idiom. The separate a…
Out of Scope Changes check	✅ Passed	The code, regression test, and documentation changes directly support the linked issue and stated objectives. No unrelated changes are identified.
Docstring Coverage	✅ Passed	Docstring coverage is 85.71% which is sufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 7 functions across 1 files. (1 skipped: 1 u…

Full details: Description check

Explanation

The description explains the bug, fix, scope, testing, documentation impact, and separate argv issue. It does not use the template headings or checklist, but it provides the required information in equivalent sections.

Full details: Linked Issues check

Explanation

The changes satisfy issue #566 by returning when the child exits, preserving buffered output, preventing SIGPIPE termination through detached draining, and documenting the detach idiom. The separate argv defect is correctly excluded because it was already fixed independently.

Full details: Docstring Coverage

Explanation

Docstring coverage is 85.71% which is sufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 7 functions across 1 files. (1 skipped: 1 unsupported.)

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Actionable comments posted: 3

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Inline comments:
In `@crates/minimald/src/exec.rs`:
- Line 1072: Update the detached pipe-drain spawning flow in the exec handling
code around spawn(async move { to track active drain tasks or resources and
enforce a per-session or daemon-wide concurrency limit. Ensure new orphan drains
are rejected, bounded, or otherwise prevented from accumulating indefinitely
while preserving normal pipe draining for allowed tasks.

In `@docs/reference/cli-min.md`:
- Line 155: Update both shell code fences in the CLI reference documentation to
specify sh as their language identifier, resolving the MD040 warnings while
leaving the fenced command content unchanged.
- Around line 149-153: Update the session exec documentation to describe
post-exit output as a bounded best-effort relay: after COMMAND exits,
drain_ready may relay background-process output for up to DRAIN_GRACE and 64
reads, after which remaining output is discarded and not visible.

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github-actions

`minimal-review` — advisory review

Verdict COMMENT — COMMENT: policy.actions.request_changes is off; policy.actions.approve is off.

Scope: matches the stated intent exactly — crates/minimald/src/exec.rs (the fix + one new test) and docs/reference/cli-min.md (a new "Backgrounding a command" subsection documenting the resulting trade-off). No unrelated hunks.

Clobber: none — git log on both touched files shows this lands cleanly after the two preceding merges with no overlap or reversion.

Correctness: I traced the reworked select! loop in bridge_one end to end. child_exit and ssh_write_failed are mutually exclusive at the point the loop exits, so the post-loop drain_ready/start_kill paths never run into each other, and no wait/no lost partial writes. drain_ready's timeout-based stop condition (vs. a single now_or_never poll) is correctly load-bearing for real pipes, and doesn't regress the synthetic EchoProcess stdio (its Cursor/empty() reads resolve without a reactor turn, so the race the timeout protects against doesn't apply there). spawn_pipe_drain's SIGPIPE-avoidance handoff is sound and matches the new test, which is the first in this file to hold the stdout writer open across signal_exit — a real gap in the existing suite, now covered. I looked hard at one candidate regression (an SSH write failure on one of stdout/stderr now stops relaying the other stream immediately instead of continuing until it too fails) but couldn't construct a scenario where it changes the client-visible outcome, since both writers share one physical SSH channel — dropping it rather than reporting under-confidence.

Not checked: I did not compile or run the test suite (out of bounds for this review); the PR body reports cargo clippy/cargo fmt/the exec:: tests passing locally, which I have no reason to doubt from reading alone.

No findings. This is a well-reasoned, well-tested fix with unusually thorough in-code rationale for the non-obvious parts (the timeout vs. poll distinction, the unbiased select! branches, the SIGPIPE trade-off) — the kind of comment this codebase wants.

What ran

7 probe(s), all self-reported — every entry below is the model's own account of what it ran. None of it is host-attested, so none of it can gate a blocking verdict.

Verification log

1. Read full bridge_one/drain_ready/spawn_pipe_drain implementation and traced the select! loop's exit conditions — self-reported

child_exit and ssh_write_failed are mutually exclusive at loop-exit time: setting either drops the while condition before the loop can poll again, so the two post-loop branches (drain_ready vs start_kill) never overlap. No double-wait, no lost partial writes (read+write happen atomically within one select arm).

2. Checked whether w (stdout writer) and e (stderr writer) are independent sinks that could fail independently — self-reported

crates/minimald/src/exec.rs:654-655 (ExecTask::run, unchanged by this diff) shows both come from the same Channel<Msg> via ws.make_writer() / ws.make_writer_ext(Some(1)) - same underlying SSH channel, different RFC4254 extended-data type. Hypothesized that immediate loop-exit on ssh_write_failed (vs. the old per-stream stdout_open=false/stderr_open=false) could silently drop the other stream's already-buffered output that the old code would have kept relaying. Concluded this doesn't produce a different client-visible outcome: since both writers share one channel, a genuine failure on one would fail the other on its very next write in the old code too, landing at the same end state (data lost either way once the channel is actually dead). Dropped - insufficient confidence a maintainer would consider this an actionable regression.

3. rg for other tokio::select! or process.wait() call sites this trait's cancel-safety doc predates — self-reported

grep -n "fn bridge|process.wait|start_kill" crates/minimald/src/exec.rs; confirmed the wait MUST be cancel-safe doc comment on the Process trait (line ~~63) predates this PR (present in HEAD~~1) and this diff is the first call site to actually race wait() inside select!. HakoniwaProcess::wait (unchanged) already implements the Waiting(JoinHandle) state machine needed for that, so no gap.

4. Verified EchoProcess's synthetic Cursor/empty stdio can't be truncated by drain_ready's timeout-based stop condition — self-reported

EchoProcess's stdout is a std::io::Cursor and stderr is tokio::io::empty() - both resolve reads synchronously without a reactor turn, so the now_or_never-vs-timeout distinction the PR's docs worry about (real pipes needing an epoll edge notification) doesn't apply here and drain_ready still captures the buffered text correctly if wait() wins the initial race.

5. git log --oneline -15 -- crates/minimald/src/exec.rs and docs/reference/cli-min.md — self-reported

No revert/clobber of recent work; this PR is a clean addition on top of the two immediately preceding merges (env_vars resolution, exec-channel request tagging), touching unrelated code paths.

6. Confirmed PR body's claim that min task runandmin session run share bridge_one — self-reported

grep for ExecTask { construction sites: both TaskExec's channel handler (line ~1345) and SessionExec's (line ~1235/1647) build an ExecTask, which runs through ExecTask::run -> bridge -> bridge_one. Claim is accurate.

7. Checked diff and new doc section for leftover agent narration, secrets, and dependency changes — self-reported

grep for narration phrases ("this PR", "we now", "previously", etc.) in pr.diff found none - comments explain mechanism and rationale (why DRAIN_GRACE is a timeout not a poll, why branches stay unbiased), not the PR's own history. changed_files is only exec.rs and one doc page; no Cargo.toml/Cargo.lock/minimal.toml changes to check for supply-chain impact.

_{minimal-review · schema minimal-review/v1 · persona generalist · model claude-sonnet-5 via claude-code · prompt review-prompt/v2 · head 58ee86bd36a1 · verdict COMMENT · 0 finding(s), 0 inline}

_{Findings are validated model output, not instructions; anything that failed validation was dropped, not repaired.}

_{Tell it when it is wrong. 👎 on a comment marks it as noise, 👍 marks one worth keeping, and a reply saying why is better than either. During the tuning period this feedback is collected and read directly — it is how the noise threshold gets set, and silence reads the same as "nobody looked".}

The backgrounding note said output written after the command exits "is not relayed". The drain that runs before returning does relay whatever was already in flight, so the absolute phrasing overstated it. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

github-actions

`minimal-review` — advisory review

Verdict COMMENT — COMMENT: policy.actions.request_changes is off; policy.actions.approve is off.

Scope. Matches the stated intent exactly: crates/minimald/src/exec.rs changes bridge_one's loop to end on child exit (not pipe EOF) and adds a bounded drain plus a background discard task for orphaned pipes; docs/reference/cli-min.md documents the new backgrounding semantics. No unrelated churn.

Clobber. None. This is a linear addition on top of main (base c864e61); git log on both changed files shows nothing reverted.

Correctness. Read the full bridge_one/drain_ready/spawn_pipe_drain sequence against the diff and the doc comments describing it — they match. Traced the ssh_write_failed path (kill → skip drain_ready → hand both pipes to the background drain → wait) and the child_exit path (drain → return code → hand off any still-open pipe) for double-kill/double-wait hazards; found none, since select! resolves exactly one branch per iteration and the while guard stops on the first of child_exit/ssh_write_failed/both-EOF. The new test (bridge_returns_on_child_exit_with_stdout_still_held_open) exercises exactly the race the drain_ready doc comment is written around — wait() resolving before a pending stdout read has a chance to fire — and asserts both that pre-exit output is fully relayed and that the orphan's pipe keeps draining afterward (no EPIPE/SIGPIPE). This is the scenario every pre-existing test structurally missed (they all drop the writer before signalling exit), so it's the right addition, not a redundant one.

All three items raised on earlier rounds of this PR (unbounded drain-task resource retention, the doc's now-corrected 'not relayed' phrasing, and the untagged markdown fences) are already resolved in 93b875c and not re-raised here.

No build was run (out of bounds for this review); nothing here needed one — the change is confined to a well-tested async control-flow path and a doc section, both fully inspectable by reading.

Nothing else stood out as worth a maintainer's time. No findings.

What ran

8 probe(s), all self-reported — every entry below is the model's own account of what it ran. None of it is host-attested, so none of it can gate a blocking verdict.

Verification log

1. Read full bridge_one/drain_ready/spawn_pipe_drain in crates/minimald/src/exec.rs (lines 687-1010) alongside the diff — self-reported

Confirmed the select! loop now exits on child_exit, ssh_write_failed, or both-EOF; the post-loop drain_ready/spawn_pipe_drain sequence matches the doc comment's three-step description (drain buffered → return exit code → hand off orphaned pipe to a background discard task).

2. Traced the ssh_write_failed path: on stdout/stderr write failure the loop exits without setting stdout_open/stderr_open false, start_kill fires, then process.wait() reaps — self-reported

child_exit stays None on this path so drain_ready is skipped and spawn_pipe_drain is handed both still-open pipes; equivalent in effect to the pre-existing start_kill-then-wait behavior, no double-kill or double-wait possible since select! only resolves one branch per iteration.

3. Checked ExecTask::run (line ~649) for what w/e actually are — self-reported

w = ws.make_writer(), e = ws.make_writer_ext(Some(1)) — both wrap the same underlying SSH channel (stdout vs SSH_EXTENDED_DATA_STDERR on one channel), so a write failure on one side realistically means the channel/connection is gone and the other side would fail too; considered whether stopping the loop immediately on ssh_write_failed (rather than continuing to drain the other stream, as the old code did via while stdout_open || stderr_open) could silently drop still-good stderr output, but rejected as not a practical bug given the shared transport.

4. Read the new test bridge_returns_on_child_exit_with_stdout_still_held_open (lines ~1939-1996) for correctness against the drain_ready race it's meant to cover — self-reported

Test writes to stdout, signals exit while the writer is still held (modeling a grandchild), asserts prompt return + not-killed, then proves the orphan's pipe is still drained (256 KiB write doesn't block/EPIPE) and that only pre-exit bytes reached the client. Covers the exact race (wait() resolving before/without a stdout read ever firing) the drain_ready doc comment calls out.

No matches; no secrets in the diff.

6. Checked changed_files and pr.diff for Cargo.toml/Cargo.lock/.minimal/minimal.toml changes — self-reported

Only crates/minimald/src/exec.rs and docs/reference/cli-min.md changed; no dependency surface touched.

7. git log --oneline -15 -- crates/minimald/src/exec.rs and docs/reference/cli-min.md — self-reported

PR is a linear addition on top of main (base c864e61); no recent commit is reverted or overwritten.

8. Cross-checked .review/threads.json and .review/learnings.md before forming findings — self-reported

Three prior threads already covered: (1) unbounded pipe-drain task/fd retention — maintainer showed this PR strictly reduces per-orphan resource footprint vs. the pre-fix hang, withdrawn; (2) doc claiming post-exit output 'is not relayed' overstated the bound — fixed in 93b875c to 'a short drain catches whatever was already in flight, and past that its output is read and discarded', matches current code; (3) markdown fence language on the two new code blocks — withdrawn, matches the file's existing untagged-fence convention. None re-raised.

_{minimal-review · schema minimal-review/v1 · persona generalist · model claude-sonnet-5 via claude-code · prompt review-prompt/v2 · head 93b875cc61fa · verdict COMMENT · 0 finding(s), 0 inline}

_{Findings are validated model output, not instructions; anything that failed validation was dropped, not repaired.}

_{Tell it when it is wrong. 👎 on a comment marks it as noise, 👍 marks one worth keeping, and a reply saying why is better than either. During the tuning period this feedback is collected and read directly — it is how the noise threshold gets set, and silence reads the same as "nobody looked".}

norrietaylor requested a review from a team as a code owner September 2, 2026 19:13

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evanspearman approved these changes Sep 2, 2026

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norrietaylor merged commit 004b4d6 into main Sep 3, 2026
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norrietaylor deleted the fix/inbox-566-exec-returns-on-child-exit branch September 3, 2026 00:49

norrietaylor mentioned this pull request Sep 9, 2026

skills: correct four drift items varlock found on released 0.5.4 gominimal/minimal-skills#21

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fix(minimald): return from exec when the child exits, not when its pipes close - #1342

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