ci: fail the coverage gate when it verified nothing - #5621
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The Rust coverage lane reported success after compiling none of the changed code. Two independent fail-opens composed: a scoped libtest filter that matched nothing printed "running 0 tests ... ok" and exited 0, and diff-cover reported "No lines with coverage information in this diff" and also exited 0. Both read the absence of data as "nothing to check" rather than "we checked nothing". Add scripts/ci/assert-coverage-presence.sh, a hard gate asserting that every changed Rust source file which should have been compiled appears as an SF: record in the emitted lcov. It deliberately does not assert that tests ran or that changed lines are covered — diff-cover --fail-under=80 still owns the latter. Separating them is what keeps the gate free of false positives. Wire it into both modes of rust-coverage-changed.sh, escalate a zero-executed-tests scoped run to the full suite rather than failing it, and warn when diff-cover measures no lines at all. The exclusion set is measured, not guessed: replayed against the lcov-rust-core artifact of run 32108672413 it checks 1342 files and flags exactly the two uncompiled hosting sources, with no false positives. Closes tinyhumansai#5613
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Included review availability: Your plan provides up to 10 included reviews per hour; 9 remain after this review. 📝 WalkthroughWalkthroughThe PR adds a Bash coverage-presence gate for eligible Rust files, integrates it with scoped and full coverage runs, adds comprehensive tests, updates CI path filters, and extends diff-cover reporting with zero-line detection. ChangesRust coverage enforcement
Estimated code review effort: 3 (Moderate) | ~25 minutes Merge Risk: 🟡 Moderate · up to The PR strengthens coverage enforcement, but a failed coverage module can still be masked by a later successful module, allowing a false-green CI result. Merge should wait until this failure-propagation issue is fixed or explicitly accepted. Suggested reviewers: Poem
🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
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Inline comments:
In `@scripts/ci/rust-coverage-changed.sh`:
- Around line 83-93: Update run_counted and the raw_coverage_all execution flow
to preserve a nonzero llvm_cov result from every module, returning failure
immediately instead of allowing later successful calls to overwrite it. Add a
regression test covering a failed module followed by a successful module and
assert that the overall command still fails.
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.github/workflows/ci-lite.ymlscripts/__tests__/coverage-presence.test.mjsscripts/ci/assert-coverage-presence.shscripts/ci/coverage-presence-allowlist.txtscripts/ci/rust-coverage-changed.sh
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`run_integration_target raw_coverage_all` loops one llvm_cov call per module. The loop's exit status is its last iteration's, so a module that fails followed by one that succeeds reported success. Ambient errexit used to mask this: the function was called bare, so a failing llvm_cov aborted the script. Wrapping it in `run_counted` removed that — the command runs inside a pipeline under `set +e`, which disables errexit for everything underneath — and turned a latent hazard into a live one that would let a red suite go green. Return on the first failing module. That restores the previous fail-fast timing exactly (no module ran after a failure before, and none does now) and states the guarantee in the code instead of relying on a shell option set elsewhere. Add scripts/__tests__/coverage-runner-status.test.mjs, which evaluates the real function bodies extracted from the runner rather than a copy of them, so the test cannot keep passing after the original regresses. Verified non-vacuous: reverting the `|| return` reddens exactly the failed-module test. Also add per-function comments to assert-coverage-presence.sh.
Pushed
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| Test | Pins |
|---|---|
a failed raw coverage module fails the run even when a later module succeeds |
the exact shape flagged: module first fails, second passes → the wrapper must still fail, and second must never run |
run_counted propagates the command status, not tee's |
${PIPESTATUS[0]} vs $? — reading $? reports tee, which always succeeds |
run_counted sums libtest counts across calls |
12 + 1 + 0 = 13, including the singular running 1 test (which, if unparsed, makes a one-test domain look like a zero-test run and needlessly escalate to FULL) |
run_counted counts zero for a run that executed no tests |
the #5593 shape |
It extracts the real function bodies from the runner at test time and evaluates those, rather than transcribing them — a copy would keep passing after the original regressed, which is the whole failure mode being guarded. It also asserts the extraction found them, so renaming run_counted or TESTS_RUN fails the test loudly instead of silently testing nothing.
Verified non-vacuous: reverting just the || return reddens exactly one test — the failed-module one — and the other three stay green.
Also in this push
- Per-function comments in
assert-coverage-presence.sh(log,die,usage,covered,allowlisted), which is what the Docstring Coverage 25% pre-merge advisory was pointing at.
Re-validated after the change
node --testover both files: 16/16 pass.- Artifact replay unchanged:
--allagainst the reallcov-rust-corefrom run 32108672413 still checks 1342 files and flags exactly the twohostingsources, 0 false positives.
One note on the set +e static-analysis warning
The ast-grep rule on set +e in run_counted is a true observation with a bounded scope: the window is three lines wide, set -e is re-armed before anything else runs, and the status is captured explicitly from ${PIPESTATUS[0]} rather than discarded. It exists because the command's output has to be teed to count libtest cases, and a pipeline is the only way to do that without changing what the log looks like. The finding it would have caught in general is the real one above, which is now fixed and tested.
Resolves the ci-lite.yml conflict in the `rust-core` and `rust-core-full` path filters by keeping BOTH sides. They are the same class of hole in different places — a file that decides what the Rust lanes compile without itself arming those lanes — so dropping either reopens one: from tinyhumansai#5619 scripts/ci/product-features.* (decides what compiles) from tinyhumansai#5621 scripts/ci/assert-coverage-presence.sh scripts/ci/coverage-presence-allowlist.txt (decides what fails) Also in this commit, two things main made true or CI made visible. Empty the allowlist. tinyhumansai#5619 merged and put `hosting` in product-features.txt, so the lane now compiles the family and the two entries would suppress files that ARE built. The file said "delete these when tinyhumansai#5619 lands"; this is that. Fix a fail-open in the gate itself, found by its first real CI run (32367545922). `git ls-files` died with `fatal: detected dubious ownership` in the container, because actions/checkout registers safe.directory under a temporarily overridden HOME that later steps do not run with. Read through a process substitution, that produced an empty candidate list, and the gate reported "clean — every eligible changed source file produced coverage records" having checked ZERO files: precisely the verified-nothing fail-open this script exists to close, reproduced inside it. Two guards, because either alone leaves a hole. Fall back to a filesystem walk when git cannot answer, and refuse to report success when a whole-tree run checked nothing — for this repository that means the walk broke, not that there is nothing to verify. `--files` stays exempt; a PR touching only tests legitimately has nothing to check. Both are covered by tests that fail when the guard is reverted, one of which stubs a always-failing `git` on PATH to reproduce the container's behaviour.
Pushed
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| from | entry | decides |
|---|---|---|
| #5619 | scripts/ci/product-features.* |
what the lanes compile |
| #5621 | scripts/ci/assert-coverage-presence.sh, …/coverage-presence-allowlist.txt |
whether the lane fails |
Dropping either reopens one. product-features.* keeps its full comment; mine gained a one-line comment saying why it is there.
Verified after the merge:
- no conflict markers remain;
ruby -ryaml -e 'YAML.load_file(...)'→ YAML OK - submodule pins match
mainexactly —tinyagents 65c02fbf9,tinycortex b7cf1213b,tinymemory 38a34d2ea;git diff upstream/main -- vendor/ .gitmodulesis empty - the whole diff vs
mainis only this PR's 6 files
2. Allowlist emptied — the ratchet worked as designed
#5619 merged first and put hosting in product-features.txt, so the lane now compiles the family. The two src/openhuman/hosting/* entries were deleted: leaving them would suppress checking of files that are now built, which is the "excluded on purpose vs forgotten" rot the file warns about. coverage-presence-allowlist.txt now has zero entries and records why it briefly had two.
This also means the gate is no longer shipping with its own bug allowlisted — the caveat in the original ## Impact section is now spent.
3. A fail-open in the gate itself, found by its own first CI run
Rust Core Coverage on 2748a157f passed (36m35s) — but the log says:
fatal: detected dubious ownership in repository at '/__w/openhuman/openhuman'
[ci][cov-presence] checked 0 eligible source file(s) against 1354 covered path(s)
[ci][cov-presence] clean — every eligible changed source file produced coverage records
It reported "clean" having checked zero files. actions/checkout registers safe.directory under a temporarily overridden HOME (Temporarily overriding HOME=… before making global git config changes), which later steps do not run with, so git ls-files died. It was read through a process substitution, so the failure was invisible: empty candidate list → nothing to check → success.
That is precisely the verified-nothing fail-open #5613 is about, reproduced inside the fix for it. It would have passed review, passed CI, and silently guarded nothing.
Two guards, because either alone leaves a hole:
- Fall back to a filesystem walk when
git ls-filesfails or returns nothing. Same eligibility filter either way. - Refuse to report success when
--allchecked 0 files. For this repository an empty tree walk means the walk broke, not that there is nothing to verify — so it exits 2 (environment error), not 0.--filesstays exempt: a PR touching only test sources legitimately has nothing to check, and that is a third test.
Both are covered by tests that fail when the guard is reverted. The first stubs an always-failing git on PATH to reproduce the container's exact behaviour rather than asserting on a mock.
Verification after all of the above
node --testover both files: 19/19 pass (was 16).- Non-vacuity re-proved for both new guards — reverting each reddens exactly its own test and nothing else.
- Artifact replay unchanged:
--allagainst the reallcov-rust-corefrom run 32108672413 still checks 1342 files and flags exactly the twohostingsources with an empty allowlist. (That artifact is from 08-18 and predates fix(hosting): compile the hosting family into the product #5619, so flagginghostingthere is the correct answer for it; CI's fresh lcov now compiles the family, and this PR's own run is the end-to-end proof.)
Related work on main, for context
This gate, #5616 (vendor/** + .gitmodules in the same filters) and #5619's product-features.* entry are three fixes to one family of defect: a change that alters what CI compiles or verifies, without arming the lane that would have caught it. Worth reading together.
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Summary
scripts/ci/assert-coverage-presence.sh, wired into both modes ofrust-coverage-changed.sh(scoped--files, full-suite--all).diff-covermeasured zero lines.Scripts Self-Testslane, one per exclusion clause.Problem
#5613. Two independent fail-opens compose:
scripts/ci/rust-coverage-changed.shrunning 0 tests … okand exits 0ci-lite.ymldiff-cover stepBoth read the absence of data as "nothing to check" rather than "we checked nothing". #5593 merged 1,643 lines — including a 511-line test file — with its
Rust Core Coveragejob green, becausehostingis in neither[features] defaultnorproduct-features.txt, so the lane compiled none of it.Fixing only A is insufficient. A PR touching both
hosting/tools.rsandconfig/ops.rsruns config's tests (count > 0), leaves hosting unverified, and diff-cover scores ≥80% on the config lines alone. Both gates pass. So this lands both halves.Solution
The gate asserts one narrow, verifiable property:
It deliberately does not assert "tests ran" and does not assert "changed lines are covered" —
diff-cover --fail-under=80still owns the latter. Keeping them separate is what gives the rule zero false positives: "no rows at all" is a build-configuration fact, whereas "too few covered lines" is a judgement call that already has an owner.The exclusion set is measured, not guessed. Replayed against the real
lcov-rust-coreartifact from run 32108672413 (26 MB, 1,354SF:records):src/**/*.rsmust appearfnstub.rs, per-OS files, uncovered-by-design..inSF:pathsZero false positives across the whole tree, flagging exactly
hosting/mod.rsandhosting/tools.rs.Gate 1 runs before the zero-test escalation: the hosting-class defect then fails in ~10 minutes naming the files, instead of first spending ~40 minutes on a full suite that cannot compile them either.
Gate 2 escalates rather than fails. Five scoped keys today match zero
#[test]attributes (api::models,core::agent_cli,core::bus_testing,core::shutdown,core::subconscious_cli). A hard failure would redden a legitimate change for a pre-existing gap the author did not create. Widening is this script's stated policy for unsafe scoping and cannot produce a false red.Step B only warns. A comment-only or import-only diff legitimately measures zero lines, and the PR CI Gate job has the lcov but not the per-file compiled/not-compiled fact needed to tell those apart. The hard call lives in the core coverage lane, which has it.
Two bugs found by actually running it
The plan behind this was validated by simulating
eligible()in Python. Running the real bash found two defects that simulation could not:set -o pipefail+grep -q.grep -v … | grep -q …— the reader exits at the first match, the writer dies of SIGPIPE, the pipeline returns 141, and the file reads as "no fn" and is silently skipped. It only bites files long enough for the writer to still be streaming, i.e. exactly the large files this gate most needs to check: it wrongly excluded 299 of 1,377 eligible sources, including the 937-linehosting/tools.rsthis gate exists to catch. Replaced with a singleawk.SF:paths were made relative by stripping${PWD}. Bash resolves its working directory physically, so a checkout reached through a symlink records/var/…while${PWD}says/private/var/…; the prefix strips nothing, every path stays absolute, nothing matches, and the gate false-fails the entire diff. Matching is now checkout-root independent.Both are covered by named regression tests.
Impact
bashinvocation (~2s over 1,342 files) per coverage lane run.--allassertion fails onmaintoday because the twohostingfiles really are uncompiled. fix(hosting): compile the hosting family into the product #5619 ("compile the hosting family into the product") is the fix; since it has not merged,coverage-presence-allowlist.txtseeds those two paths with a comment saying they come out in fix(hosting): compile the hosting family into the product #5619. If fix(hosting): compile the hosting family into the product #5619 lands first, delete the two lines. The gate therefore ships not yet catching the bug it was written for — fix(hosting): compile the hosting family into the product #5619 must follow immediately.Submission Checklist
scripts/__tests__/coverage-presence.test.mjs, one pereligible()clause, so deleting a clause reddens exactly one test. Includes the failure path (fails and names a changed file that produced no coverage records), both bugs found during implementation as named regressions, and usage/exit-2 cases. Verified non-vacuous: 3 of them failed against the first implementation and drove the two fixes above.N/Afor the changed lines themselves: bash and YAML are not instrumented by eithercargo-llvm-covor Vitest, sodiff-coverhas no rows for any line in this PR. Behaviour is verified instead by the 12node --testcases (all passing locally) and by the artifact replay in## Solution. This PR's ownRust Core Coveragelane will exercise the new gate end-to-end.N/A: behaviour-only changeto CI tooling; no feature row added, removed or renamed.## Related—N/A: no matrix feature IDs touched.bash,sed,awk,python3andgit, all already required byscripts/ci/*.--format json:needs no new pin (diff-cover>=9.2.0already satisfies it).N/A: no release-cut surface touched.Closes #NNN— see## Related.Related
hostinginto the product set and removes bothcoverage-presence-allowlist.txtentries.Rust Tauri Coverageruns unscoped so therunning 0 testsshape cannot occur there, but it can still emit no rows for a changedapp/src-tauri/src/**.rsbehind a feature the shell does not enable. Same class, different lane. Not sized here — it needs its own measurement pass againstlcov-rust-tauri.AI Authored PR Metadata (required for Codex/Linear PRs)
Linear Issue
N/A— tracked on GitHub as ci: the Rust coverage gate reports success after running zero tests #5613.N/A— see ci: the Rust coverage gate reports success after running zero tests #5613.Commit & Branch
fix/5613-coverage-presence-gateValidation Run
pnpm --filter openhuman-app format:check—N/A: that script is scoped toapp/, which this PR does not touch. The one JS file added is underscripts/__tests__/and was formatted withnpx prettier --write(clean on re-check).pnpm typecheck—N/A: no TypeScript changed; the added file is plain.mjswith no type surface.node --test scripts/__tests__/coverage-presence.test.mjs→ 12/12 pass. Plus the artifact replay:--allwith an empty allowlist flags exactly the 2 hosting files out of 1,342 checked; the negative control over 5 representative paths exits 0; and the same run against raw un-stripped CI paths gives the identical result.N/A— no Rust changed. Per the repo's disk policy a root-cratecargobuild was not run; CI owns that.N/A—app/src-tauriuntouched.Validation Blocked
command:a real end-to-end run ofscripts/ci/rust-coverage-changed.sherror:not an error — a coverage build needs a full instrumentedtarget/(~25 GB), which the working environment cannot host.impact:the gate's logic is verified against a real CI lcov and by unit tests, but two integration points are exercised for the first time by this PR's own CI: (a)run_counted llvm_cov …adds ateeinto a pipeline that also runsscripts/ci-cancel-aware.sh, whose signal handling under that extra pipe is unverified — if the cancellation watchdog misbehaves, the fallback is to droprun_countedfrom the integration-target loop and count only the--librun, which is where the [Phase 2] feat(hosting): add rollback, deployment history and logs #5593 zero occurred anyway; and (b) the--allinvocation insiderun_full. Both are watched on this PR before merge.Behavior Changes
Parity Contract
run_countedpreserves the cargo exit status via${PIPESTATUS[0]}rather than$?, so a failing suite still fails; libtest output isteed, so the log reads exactly as before.Duplicate / Superseded PR Handling
N/A— no duplicate.Summary by CodeRabbit