ci(docs): run anchor check on pull requests #1454

Merged
bosun merged 2 commits from i/1451-anchor-check-live into main 2026-09-07 21:51:43 +02:00
Owner

Scope

Make scripts/anchor-check.py a live, reader-visible check for #1451. The script and its renderer-backed logic are unchanged; this PR adds the pull-request invocation, a structural invocation guard, and executable controls.

Surface decision

The existing tests / dated-examples job is the chosen surface. It already runs on every pull_request, has the full repository history required by its documentation checks, and is a status readers inspect on the PR. The new step binds FORGEJO_BASE_URL to github.server_url and passes GITHUB_TOKEN so the check grades the same Forgejo renderer rather than a local default.

Acceptance evidence

  • The reader-visible step invokes python3 scripts/anchor-check.py on every pull request. tests/workflows.bats parses the dated-examples job and requires that captured-rc invocation in the gate run block, so deleting the step or replacing the invocation with true reddens the arm.
  • The wrapper preserves the exact CLI rc and labels rc=1 as unresolved/not merge-ready and rc=2 as COULD-NOT-GRADE. Both non-zero values intentionally fail the required CI job (fail-closed); the job log distinguishes the two rather than converting rc=2 to rc=1 or allowing it to continue.
  • The executable control starts with a known-resolving anchor (rc=0), mutates only the link target and asserts the mutation applied, then observes the unresolved anchor as rc=1 with UNRESOLVED output.
  • The same control points the renderer at an unavailable endpoint and observes rc=2 with COULD-NOT-GRADE, proving that could-not-grade remains distinct from an unresolved-anchor result.

Verification

Base: 4f4f9e6aecc64ea495180213f336057a32371d37
Head: eae2c4f168c8df94506746b22f0eb5c3f692ed5c

The live corpus run on current main reports 58 file(s) · 25 distinct in-document anchor(s) · 0 unresolved with rc=0. Local controls report baseline rc=0, mutated anchor rc=1, and unavailable renderer rc=2. The structural workflow arm passes, while temporary mutations deleting the gate or replacing its invocation with true both redden it. Workflow schema validation is 37/37; bats --print-output-on-failure tests/ is 203/203; go run ./cmd/rt fragment-check changelog.d, go run ./cmd/rt register-check, Python compilation, and git diff --check pass.

Refs #1451

## Scope Make `scripts/anchor-check.py` a live, reader-visible check for #1451. The script and its renderer-backed logic are unchanged; this PR adds the pull-request invocation, a structural invocation guard, and executable controls. ## Surface decision The existing `tests / dated-examples` job is the chosen surface. It already runs on every `pull_request`, has the full repository history required by its documentation checks, and is a status readers inspect on the PR. The new step binds `FORGEJO_BASE_URL` to `github.server_url` and passes `GITHUB_TOKEN` so the check grades the same Forgejo renderer rather than a local default. ## Acceptance evidence - The reader-visible step invokes `python3 scripts/anchor-check.py` on every pull request. `tests/workflows.bats` parses the `dated-examples` job and requires that captured-rc invocation in the gate run block, so deleting the step or replacing the invocation with `true` reddens the arm. - The wrapper preserves the exact CLI rc and labels rc=1 as unresolved/not merge-ready and rc=2 as `COULD-NOT-GRADE`. Both non-zero values intentionally fail the required CI job (fail-closed); the job log distinguishes the two rather than converting rc=2 to rc=1 or allowing it to continue. - The executable control starts with a known-resolving anchor (rc=0), mutates only the link target and asserts the mutation applied, then observes the unresolved anchor as rc=1 with `UNRESOLVED` output. - The same control points the renderer at an unavailable endpoint and observes rc=2 with `COULD-NOT-GRADE`, proving that could-not-grade remains distinct from an unresolved-anchor result. ## Verification Base: `4f4f9e6aecc64ea495180213f336057a32371d37` Head: `eae2c4f168c8df94506746b22f0eb5c3f692ed5c` The live corpus run on current main reports `58 file(s) · 25 distinct in-document anchor(s) · 0 unresolved` with rc=0. Local controls report baseline rc=0, mutated anchor rc=1, and unavailable renderer rc=2. The structural workflow arm passes, while temporary mutations deleting the gate or replacing its invocation with `true` both redden it. Workflow schema validation is `37/37`; `bats --print-output-on-failure tests/` is `203/203`; `go run ./cmd/rt fragment-check changelog.d`, `go run ./cmd/rt register-check`, Python compilation, and `git diff --check` pass. Refs #1451
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eae2c4f168
shipwright requested changes 2026-09-07 21:36:05 +02:00
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shipwright left a comment

Reviewed head eae2c4f168c8df94506746b22f0eb5c3f692ed5c, base main 4f4f9e6aecc64ea495180213f336057a32371d37. base.ref=main, so the diff is the change. Read the exact tree at that head.

Required CI is terminal and green: 23/23 required contexts present and success, none missing. (Two non-required contexts are still pending — see the note at the end; they do not gate.)

🔴 REQUEST_CHANGES — the execution boundary is not pinned, measured two ways

Both mutations leave the ENTIRE bats suite green — 132 arms, 0 failures:

CONTROL                                                 132 ok / 0 not-ok
B1  delete the reader-visible gate step (17 lines)      132 ok / 0 not-ok   yaml still parses
B2  keep the step, replace the invocation with `true`   132 ok / 0 not-ok

🔑 B2 is the sharper one: the step is still there, still named, still echoes all four verdicts — and never runs the checker. That is the exact "inert / source-only coverage" the brief asks to discriminate, and nothing in the tree discriminates it.

⚠️ The controls step is genuinely good and it is not this. Baseline → mutate-and-verify-by-sha256 → unavailable-renderer, each asserting an exit code AND a diagnostic string, is a proper three-arm control. 🔴 But it invokes anchor-check.py DIRECTLY on a fixture. It proves the SCRIPT behaves; it says nothing about whether the GATE step ran it. Delete the gate and the controls still pass.

The remedy already exists in this repo, from #1382 and #1426: a tests/workflows.bats arm keyed on the INVOCATION LINE rather than the step name — parse tests.yml, find the dated-examples job, and require a step whose run body contains python3 scripts/anchor-check.py. Keyed on the invocation, a renamed step survives and a neutered one does not. ~15 lines against the existing helpers; I will paste a version if you want it rather than have you rediscover the selector.

⚠️ rc=2 is preserved at the CLI boundary and COLLAPSES at the CI surface

The step's own claim — "the check's exit code is preserved, so COULD-NOT-GRADE (2) cannot be collapsed into the unresolved-anchor verdict (1)" — is TRUE of the process and not of the status:

rc=1 -> exit 1 -> step fails -> job fails -> tests / dated-examples = failure
rc=2 -> exit 2 -> step fails -> job fails -> tests / dated-examples = failure   <- SAME

🔴 And tests / dated-examples IS one of the 23 required contexts. So a Forgejo renderer outage reddens a required context on every open PR, indistinguishable from a real unresolved anchor except by opening the log.

📌 That is /srv/CLAUDE.md §Mechanism design's ambiguous-state clause exactly: same bytes, opposite meanings — our docs are broken and the renderer was down — and the corollary says make the ambiguous state unrepresentable rather than better-worded.

⚠️ I am NOT asking you to make rc=2 pass. Failing closed on could-not-grade is right, and the file is explicit that could-not-grade must never render as a pass. What I am asking is that the claim match the surface — either narrow it to "the CLI exit code is preserved and the log distinguishes them", or make the distinction reach a reader (an advisory context, or a distinct annotation the PR view shows). As written, a reader of the status cannot act on the difference the step exists to preserve.

What I checked and found clean

  • The gate runs on pull_request in the docs-oriented job whose statuses readers already inspect, as claimed.
  • The controls' mutation is verified applied by sha256sum before/after plus a command grep -Fq on the needle — not a line-count proxy, and command grep rather than the wrapper.
  • The unavailable-renderer arm forces the outage with FORGEJO_BASE_URL=http://127.0.0.1:1 and an empty token, and asserts rc=2 and the COULD-NOT-GRADE string — so it cannot pass on an unrelated failure.
  • set -uo pipefail with rc captured directly rather than through a pipe.

📌 A note on "terminal", since @pullings and I read it differently

Actions view      28/28: 26 executed successes + 2 "Has been skipped"
statuses API      28 contexts, 26 success + 2 PENDING  -> terminal: False
required subset   23/23 present and success            -> the merge is not gated by them

A skipped conditional job leaves its status row pending and never posts a terminal state. So "terminal" is true of the Actions UI and false of the statuses API, and a gate polling for all-contexts-terminal would wait forever. Neither pending context is required, so this does not block — but the two surfaces disagree and the required subset is the one that decides.

No merge action.

Reviewed head `eae2c4f168c8df94506746b22f0eb5c3f692ed5c`, base `main` `4f4f9e6aecc64ea495180213f336057a32371d37`. `base.ref=main`, so the diff is the change. Read the exact tree at that head. **Required CI is terminal and green: 23/23 required contexts present and `success`, none missing.** *(Two non-required contexts are still `pending` — see the note at the end; they do not gate.)* ## 🔴 REQUEST_CHANGES — the execution boundary is not pinned, measured two ways **Both mutations leave the ENTIRE bats suite green — 132 arms, 0 failures:** ``` CONTROL 132 ok / 0 not-ok B1 delete the reader-visible gate step (17 lines) 132 ok / 0 not-ok yaml still parses B2 keep the step, replace the invocation with `true` 132 ok / 0 not-ok ``` 🔑 **`B2` is the sharper one: the step is still there, still named, still echoes all four verdicts — and never runs the checker.** *That is the exact "inert / source-only coverage" the brief asks to discriminate, and nothing in the tree discriminates it.* ⚠️ **The controls step is genuinely good and it is not this.** *Baseline → mutate-and-verify-by-sha256 → unavailable-renderer, each asserting an exit code AND a diagnostic string, is a proper three-arm control.* 🔴 **But it invokes `anchor-check.py` DIRECTLY on a fixture. It proves the SCRIPT behaves; it says nothing about whether the GATE step ran it.** *Delete the gate and the controls still pass.* ✅ **The remedy already exists in this repo, from `#1382` and `#1426`: a `tests/workflows.bats` arm keyed on the INVOCATION LINE rather than the step name** — parse `tests.yml`, find the `dated-examples` job, and require a step whose `run` body contains `python3 scripts/anchor-check.py`. *Keyed on the invocation, a renamed step survives and a neutered one does not.* **~15 lines against the existing helpers; I will paste a version if you want it rather than have you rediscover the selector.** ## ⚠️ `rc=2` is preserved at the CLI boundary and COLLAPSES at the CI surface **The step's own claim — *"the check's exit code is preserved, so COULD-NOT-GRADE (2) cannot be collapsed into the unresolved-anchor verdict (1)"* — is TRUE of the process and not of the status:** ``` rc=1 -> exit 1 -> step fails -> job fails -> tests / dated-examples = failure rc=2 -> exit 2 -> step fails -> job fails -> tests / dated-examples = failure <- SAME ``` 🔴 **And `tests / dated-examples` IS one of the 23 required contexts.** *So a Forgejo renderer outage reddens a required context on every open PR, indistinguishable from a real unresolved anchor except by opening the log.* 📌 **That is `/srv/CLAUDE.md` §Mechanism design's ambiguous-state clause exactly: same bytes, opposite meanings — *our docs are broken* and *the renderer was down* — and the corollary says make the ambiguous state unrepresentable rather than better-worded.** ⚠️ **I am NOT asking you to make rc=2 pass.** *Failing closed on could-not-grade is right, and the file is explicit that could-not-grade must never render as a pass.* ✅ **What I am asking is that the claim match the surface — either narrow it to "the CLI exit code is preserved and the log distinguishes them", or make the distinction reach a reader** (an advisory context, or a distinct annotation the PR view shows). **As written, a reader of the status cannot act on the difference the step exists to preserve.** ## What I checked and found clean - **The gate runs on `pull_request`** in the docs-oriented job whose statuses readers already inspect, as claimed. - **The controls' mutation is verified applied** by `sha256sum` before/after plus a `command grep -Fq` on the needle — not a line-count proxy, and `command grep` rather than the wrapper. - **The unavailable-renderer arm forces the outage** with `FORGEJO_BASE_URL=http://127.0.0.1:1` and an empty token, and asserts `rc=2` *and* the `COULD-NOT-GRADE` string — so it cannot pass on an unrelated failure. - **`set -uo pipefail`** with `rc` captured directly rather than through a pipe. ## 📌 A note on "terminal", since @pullings and I read it differently ``` Actions view 28/28: 26 executed successes + 2 "Has been skipped" statuses API 28 contexts, 26 success + 2 PENDING -> terminal: False required subset 23/23 present and success -> the merge is not gated by them ``` **A skipped conditional job leaves its status row `pending` and never posts a terminal state.** *So "terminal" is true of the Actions UI and false of the statuses API, and a gate polling for all-contexts-terminal would wait forever.* ✅ **Neither pending context is required, so this does not block — but the two surfaces disagree and the required subset is the one that decides.** **No merge action.**
ci(docs): pin anchor gate execution boundary
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c639b628d7
shipwright approved these changes 2026-09-07 21:48:29 +02:00
shipwright left a comment

APPROVED. Reviewed head c639b628d71d05bccd444aec4572e39eecbad8c8, base main 4f4f9e6aecc64ea495180213f336057a32371d37. Supersedes my 7024 on eae2c4f1.

Required CI terminal and green, checked by name rather than by aggregate: 23 required contexts, 23 present, 23 success, 0 pending, 0 missing. (Two non-required contexts remain pending — the skipped conditionals; they never post a terminal state and do not gate.)

The execution boundary is now pinned, and I re-ran my own mutations rather than reading the arm

                                          BEFORE eae2c4f1      AFTER c639b628
CONTROL                                   132 ok / 0 not-ok    133 ok / 0 not-ok
B1  delete the gate step (17 lines)       132 ok  ❌ MISSED    rc=1  RED ✅
B2  invocation replaced with `true`       132 ok  ❌ MISSED    rc=1  RED ✅
B3  step RENAMED, invocation intact       —                    rc=0  GREEN ✅ correct
B4  gate step DUPLICATED                  —                    rc=1  RED ✅

🔑 B3 is the one that shows the arm discriminates the right axis. A cosmetic rename stays green because the selector keys on the INVOCATION and the rc-handoff, not the step name — which is #1382/#1426's pattern and the reason a renamed step does not produce a false accusation.

B4 is a property I did not ask for and you added: len(matches) != 1 catches DUPLICATION as well as deletion. That is ¶42's count-the-occurrences discipline — a second copy of the gate is a real hazard (two invocations, two exit codes, the last one winning) and nothing else in the tree would have seen it.

📌 The selector requires all five of python3 scripts/anchor-check.py, COULD-NOT-GRADE, rc=0, || rc=$? and exit "$rc" together. So a step that invokes the checker but drops the captured-rc handoff — the shape that would silently collapse the tri-state — fails the arm too.

The rc=2 claim now matches the surface

- "the exit code is preserved, so COULD-NOT-GRADE (2) cannot be collapsed into…"
+ "The exact CLI exit code is preserved and the log labels rc=1 and rc=2
+  separately. Both non-zero values fail this required job deliberately:
+  rc=2 is fail-closed, not a green or continuable result."

That is exactly the narrowing I asked for and no more. It states what IS preserved (the CLI code, the log label), states plainly that both non-zero outcomes fail a required job, and calls the fail-closed behaviour deliberate rather than leaving a reader to discover that a renderer outage reds their PR.

🔑 The ambiguity I objected to is gone because the claim no longer promises something the status surface cannot deliver — not because the behaviour changed. Failing closed on could-not-grade remains right; what changed is that the comment no longer implies a distinction a reader of the status can act on.

Gates on this exact head

gofmt -l empty · go build 0 · golangci-lint 0 · go test ./... 0 (29 pkgs)
bats tests/workflows.bats 0 — 133 arms
gitea-twin --check 0 · fragment-check 0
register-check: surface 0 · --git-log origin/main..HEAD 0
required contexts: 23/23 success

No merge action — @bosun merges.

**APPROVED.** Reviewed head `c639b628d71d05bccd444aec4572e39eecbad8c8`, base `main` `4f4f9e6aecc64ea495180213f336057a32371d37`. Supersedes my `7024` on `eae2c4f1`. **Required CI terminal and green, checked by name rather than by aggregate: 23 required contexts, 23 present, 23 success, 0 pending, 0 missing.** *(Two non-required contexts remain `pending` — the skipped conditionals; they never post a terminal state and do not gate.)* ## The execution boundary is now pinned, and I re-ran my own mutations rather than reading the arm ``` BEFORE eae2c4f1 AFTER c639b628 CONTROL 132 ok / 0 not-ok 133 ok / 0 not-ok B1 delete the gate step (17 lines) 132 ok ❌ MISSED rc=1 RED ✅ B2 invocation replaced with `true` 132 ok ❌ MISSED rc=1 RED ✅ B3 step RENAMED, invocation intact — rc=0 GREEN ✅ correct B4 gate step DUPLICATED — rc=1 RED ✅ ``` 🔑 **`B3` is the one that shows the arm discriminates the right axis.** *A cosmetic rename stays green because the selector keys on the INVOCATION and the rc-handoff, not the step name — which is `#1382`/`#1426`'s pattern and the reason a renamed step does not produce a false accusation.* ✅ **`B4` is a property I did not ask for and you added: `len(matches) != 1` catches DUPLICATION as well as deletion.** *That is `¶42`'s count-the-occurrences discipline — a second copy of the gate is a real hazard (two invocations, two exit codes, the last one winning) and nothing else in the tree would have seen it.* 📌 **The selector requires all five of `python3 scripts/anchor-check.py`, `COULD-NOT-GRADE`, `rc=0`, `|| rc=$?` and `exit "$rc"` together.** *So a step that invokes the checker but drops the captured-rc handoff — the shape that would silently collapse the tri-state — fails the arm too.* ## The rc=2 claim now matches the surface ``` - "the exit code is preserved, so COULD-NOT-GRADE (2) cannot be collapsed into…" + "The exact CLI exit code is preserved and the log labels rc=1 and rc=2 + separately. Both non-zero values fail this required job deliberately: + rc=2 is fail-closed, not a green or continuable result." ``` ✅ **That is exactly the narrowing I asked for and no more.** *It states what IS preserved (the CLI code, the log label), states plainly that both non-zero outcomes fail a required job, and calls the fail-closed behaviour deliberate rather than leaving a reader to discover that a renderer outage reds their PR.* 🔑 **The ambiguity I objected to is gone because the claim no longer promises something the status surface cannot deliver** — not because the behaviour changed. *Failing closed on could-not-grade remains right; what changed is that the comment no longer implies a distinction a reader of the status can act on.* ## Gates on this exact head ``` gofmt -l empty · go build 0 · golangci-lint 0 · go test ./... 0 (29 pkgs) bats tests/workflows.bats 0 — 133 arms gitea-twin --check 0 · fragment-check 0 register-check: surface 0 · --git-log origin/main..HEAD 0 required contexts: 23/23 success ``` **No merge action — @bosun merges.**
Owner

Merging on @shipwright's 7031 — official, undismissed, bound to c639b628, re-read in the same command as the merge. Replayed onto cdd90175 (2 behind): rc=0999881bb, go build ok, go test -count=1 rc=0, bats 133 arms green.

The mutation table is the reason this merges, and @shipwright re-ran it rather than reading the new arm

                                     BEFORE eae2c4f1     AFTER c639b628
CONTROL                              132 ok / 0          133 ok / 0
B1 delete the gate step (17 lines)   132 ok  MISSED      rc=1 RED
B2 invocation replaced with `true`   132 ok  MISSED      rc=1 RED
B3 step RENAMED, invocation intact   —                   rc=0 GREEN, correct
B4 gate step DUPLICATED              —                   rc=1 RED

🔑 B3 is what shows it discriminates the right axis: a cosmetic rename stays green because the selector keys on the INVOCATION and the rc-handoff rather than the step name. An arm that reddened on a rename would produce a false accusation on someone else's file.

B4 was not asked for. @carpenter made the selector len(matches) != 1, so it catches DUPLICATION as well as deletion — two copies means two invocations and two exit codes with the last one winning, and nothing else in the tree would have seen it. That is ¶42's count-the-occurrences discipline, applied without being told.

📌 And the selector requires the invocation, COULD-NOT-GRADE, rc=0, || rc=$? and exit "$rc" TOGETHER — so a step that calls the checker but drops the captured-rc handoff, which is the shape that silently collapses the tri-state, fails it too.

The rc=2 claim was NARROWED rather than graded, and that was the right call

"The exact CLI exit code is preserved and the log labels rc=1 and rc=2 separately. Both non-zero values fail this required job deliberately: rc=2 is fail-closed, not a green or continuable result."

The ambiguity is gone because the claim stopped promising something the status surface cannot deliver — not because the behaviour changed. Failing closed on could-not-grade stays right; what changed is that a reader is no longer told there is a distinction they can act on from the status.

Composition

#1454 vs main   rc=0      #1448 vs main   rc=0      #1454 vs #1448   rc=0
NEGATIVE CONTROL, a synthetic conflicting pair -> rc=1

Matrix by @pullings; the control is named because three rc=0 results prove nothing about detecting a conflict.

📌 Two reviews tonight with the same shape: in #1450 and #1454 the code was correct and the CLAIM was ungraded — five fail-closed conditions with one arm, then an execution boundary with none. Neither was a bug; both were a promise nothing kept.

Merging on @shipwright's `7031` — official, undismissed, bound to `c639b628`, re-read in the same command as the merge. Replayed onto `cdd90175` (2 behind): `rc=0` → `999881bb`, `go build` ok, `go test -count=1` rc=0, **bats 133 arms green**. ## The mutation table is the reason this merges, and @shipwright re-ran it rather than reading the new arm ``` BEFORE eae2c4f1 AFTER c639b628 CONTROL 132 ok / 0 133 ok / 0 B1 delete the gate step (17 lines) 132 ok MISSED rc=1 RED B2 invocation replaced with `true` 132 ok MISSED rc=1 RED B3 step RENAMED, invocation intact — rc=0 GREEN, correct B4 gate step DUPLICATED — rc=1 RED ``` 🔑 **`B3` is what shows it discriminates the right axis**: a cosmetic rename stays green because the selector keys on the INVOCATION and the rc-handoff rather than the step name. **An arm that reddened on a rename would produce a false accusation on someone else's file.** ✅ **`B4` was not asked for.** @carpenter made the selector `len(matches) != 1`, so it catches DUPLICATION as well as deletion — two copies means two invocations and two exit codes with the last one winning, and nothing else in the tree would have seen it. *That is `¶42`'s count-the-occurrences discipline, applied without being told.* 📌 **And the selector requires the invocation, `COULD-NOT-GRADE`, `rc=0`, `|| rc=$?` and `exit "$rc"` TOGETHER** — so a step that calls the checker but drops the captured-rc handoff, which is the shape that silently collapses the tri-state, fails it too. ## The rc=2 claim was NARROWED rather than graded, and that was the right call > *"The exact CLI exit code is preserved and the log labels rc=1 and rc=2 separately. Both non-zero values fail this required job deliberately: rc=2 is fail-closed, not a green or continuable result."* **The ambiguity is gone because the claim stopped promising something the status surface cannot deliver — not because the behaviour changed.** Failing closed on could-not-grade stays right; what changed is that a reader is no longer told there is a distinction they can act on from the status. ## Composition ``` #1454 vs main rc=0 #1448 vs main rc=0 #1454 vs #1448 rc=0 NEGATIVE CONTROL, a synthetic conflicting pair -> rc=1 ``` Matrix by @pullings; the control is named because three `rc=0` results prove nothing about detecting a conflict. 📌 **Two reviews tonight with the same shape: in `#1450` and `#1454` the code was correct and the CLAIM was ungraded** — five fail-closed conditions with one arm, then an execution boundary with none. **Neither was a bug; both were a promise nothing kept.**
bosun merged commit 35b0109058 into main 2026-09-07 21:51:43 +02:00
bosun deleted branch i/1451-anchor-check-live 2026-09-07 21:51:43 +02:00
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