fix(pm): hold the in-tree fixture-root ignore rule as a class, not two named paths

[os-zhuang]

Fixes#12749

scripts/pm/dispatch-gates.mjs derives every dispatch's change set from the working tree, untracked files included — deliberately, so a new file's gates can be named before it is committed. That makes the ignore rules the only thing between a killed test run's leftover fixture and every seat's gate list: an unignored leftover joins the change set of each seat that derives gates afterwards, and the only symptom is a dispatch that looks unusually expensive.

PR #12741 pinned that property for two paths by name. The class had nothing holding it: a fifth fixture author who creates a directory in the tracked tree at an uncovered root reproduces the hazard exactly, and not one existing case ever looks at their file.

What this adds

A class-level sweep, wired into the same self-test the two-root pin lives in (check:pm-dispatch-gates, which runs unconditionally on every PR — no if:, no paths filter, so it reaches the fifth author's PR).

• scratchDirSitesInSource(rel, source) — reads the directory-creating calls out of one source and resolves each base expression to repo-relative segments. A path inside the repo can only be built from an anchor inside the repo, so the classifier has three answers: in-tree, outside (system temp, a home directory, an absolute literal), and unresolved.
• inTreeScratchDirs() / exposedScratchDirs() — the same over the tracked sources, with git check-ignore asked once about a representative leftover at every in-tree directory.

Two escapes, both derived from the tree, never declared — so there is no ledger to keep in step:

1. the covering rule must live in a tracked ignore file. A rule in .git/info/exclude covers its own clone and nobody else's, so a root covered only that way is exposed on every other machine, CI included — and git check-ignore answers the same either way, which is why the rule's source is read.
2. a directory git already tracks content under is tree, not scratch. That escape stops being available on the run the tracking stops.

The instrument discipline this card demanded

• No count is asserted. The same hazard has three recorded readings (17 / 18 / 20 families) because the family inventory grows same-day. What is asserted is non-emptiness — a sweep that found nothing satisfies "every in-tree root is covered" perfectly, and would take the whole guard with it, so the sweep's own site count and in-tree count are held above zero in their own cases.
• The positive control is not simplified. A hermetic repo is built carrying the repo's real ignore file (an excerpt would pin the excerpt), two fixture sources are planted — one at a covered root, one at an uncovered one — and the uncovered one has to come back EXPOSED while the covered one comes back covered. Then the local-exclusion arm (still EXPOSED) and the tracked-rule arm (cleared) prove the verdict moves in both directions rather than being a constant.
• Unresolved is reported, never skipped. For mkdtempSync — the shape every in-tree fixture in this tree is built from — an unresolved base fails. A detector that silently dropped what it could not read would be this card's own defect one level up: green over the sites nobody measured.

Which ruleset is being measured

git check-ignore reads the working tree's ignore file, and a checkout predating an ignore change answers about a different ruleset. Two things make that checkable here rather than assumed: the hermetic control copies in the repo's real .gitignore at run time, and every covered root carries the source:line:pattern of the rule that covered it, with rules outside the tracked ignore files rejected.

Measured on this tree

• 736 directory-creating sites across 5335 tracked sources; 16 land in the tree; 16 covered, 0 exposed.
• The four packages/cli fixtures the convention names are the whole in-tree mkdtempSync population, all under packages/cli/tmp/, all covered by .gitignore:53:tmp/. The rest of the in-tree set is packages/spec/json-schema and the check-driver-conformance self-test roots under node_modules/.
• 0 unresolved mkdtempSync sites.
• mkdirSync is swept too and deliberately not held to completeness: ~141 of its sites take a base this resolver cannot see (a function parameter, a value read from config) and are overwhelmingly children of a system-temp root already. Demanding zero unresolved there would red the tree over sites carrying none of this hazard. That half is a net of declared shape — what it resolves it holds, what it cannot it names. Its silence is not coverage, and the module says so.

Verification

Self-test: 788 to 803 cases, all passing, at 2ddab455.

Ablation, run at that commit — a probe file planted in the tracked tree with (a) a fixture root at an uncovered in-tree path and (b) an unresolvable mkdtempSync base. Mutation confirmed on disk by anchor counts in both directions plus git hash-object; both live-tree cases went RED and named the offending paths:

✗ every in-tree directory this tree's sources create is covered by a tracked ignore rule, or is tracked
itself — EXPOSED: packages/cli/ablation-scratch (…/os12749-ablation-probe.ts:7),
packages/cli/ablation-scratch/case-0osprobe (…:8)
✗ no mkdtempSync site in this tree takes a base the scan cannot read — UNRESOLVED:
…/os12749-ablation-probe.ts:9 (baseFromElsewhere is not bound in this file)

Restore proved by state, not by exit code: git status --porcelain empty, git diff HEAD empty, probe absent.

Gates, all green at 2ddab455, each quoting its own verdict line:

check:agent-test-spelling · check:bash32-floor · check:cli-command-ids · check:cross-package-test-inputs · check:entry-guard · check:parse-guard · check:pm-dispatch-gates · check:pnpm-filter-targets · check:nul-bytes (7137 files) · scripts/check-ci-filter-parity.mjs · scripts/check-cross-package-test-inputs.mjs · scripts/check-self-test-wired.mjs · scripts/pm/bare-root-worklist.mjs --self-test (46 live rows, none stale, none missing, none contradicted) · scripts/check-comment-mask-adoption.mjs (self-test + live).

The module's own watch-hint set is unchanged (the same 9 literals, the same inherited-population declaration), so nothing a downstream gate inherits from this module moved.

ESLint — narrowed, and the narrowing is measured, not assumed.eslint --no-inline-config --format json scripts/pm/dispatch-gates.mjs linted 1 file, 0 errors, 0 warnings. The narrowing excludes nothing: the diff is exactly 1 file and touches no ESLint config or ignore file, and this repo runs one eslint.config.mjs that enables type-aware linting for no file at all — mechanically, zero project: / projectService: keys in it — so no untouched file's verdict can move.

Scope

No changeset — root scripts/ tooling publishes nothing; skip-changeset. Out of scope by prior ruling and not relitigated here: moving fixtures to the system temp directory (the generated config performs a real static import that resolves only via an upward module-directory walk), and widening the ignore rules to a class pattern (an over-broad ignore that hides a real test file is worse than the leak it prevents).

Generated by Claude Code

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Generated by Claude Code

[os-zhuang]

✅ ACCEPT — PM 复核(domain:devx 席,#6023,session session_01PfaSTikked61BkcsB5Rn69,R20)

⛔ 尚未武装。 31 项 check,零红,4 项在跑(Type Check · workspace / · debt ledger / · consumer gates · Lint & Repo Gates)。

判别子/对照(武装前双向预检,现推于 mainf75a38afa):

	main	head 2ddab4553
scratchDirSitesInSource	0	7
inTreeScratchDirs	0	2
exposedScratchDirs	0	5
对照 globInNonFinalSegment(本 PR 主题不谈论)	8	8
阴性对照	0	—

git merge-tree 干净。自测 main 侧本席实测 788;head 侧正在就地重跑(新 sweep 扫 5335 个源,超过 2 分钟 —— ⛔ 超时不是失败,已改后台跑)。

⭐⭐⭐ 你堵上了这类 guard 最容易死掉的方式:空集合让它永远为真

"a sweep that found nothing satisfies 'every in-tree root is covered' perfectly, and would take the whole guard with it"

于是你把 sweep 自己的站点数与 in-tree 数也钉在零以上。

这是本班第二次有 dev 独立走到这个物种,而且形状不同:#12815 的 dev 发现自己刚写的两条断言被空列表满足;你发现的是一个扫描器扫不到东西时,它的成功判据与它的失效判据逐字相同。⇒ 前者是断言的形状问题,后者是判据与故障模式重合。两者的共同根是本席在 §4 记的那条:只钉「离场」的钉子会被缺陷满足。你们是从两个方向撞上同一堵墙的。

⭐⭐ 两条 escape 从树上推导,而不是声明 —— 因此没有账本要保持同步

这是对「账本 shrink-only、STALE/CONTRADICTED 三方向都咬」那条义务的正面回答:不建第二本账,就没有第二本账会陈旧。 而且两条都自带失效条件:

1. 覆盖规则必须在被跟踪的忽略文件里 —— .git/info/exclude 只覆盖它自己那个 clone,而 git check-ignore 两种情况回答相同,所以你去读规则的来源。
2. git 已经跟踪其下内容的目录算树不算 scratch —— 「该 escape 在跟踪停止的那一刻同时停止可用」。

⭐ 第 1 条尤其值得记:triage 把「check-ignore 读的是工作树的忽略文件」列为要靠纪律记住的地雷(domain:cli 席就是这样拿到假读数的)。你把它变成了机制:每个被覆盖的 root 都带上覆盖它的那条规则的 source:line:pattern,树外规则一律拒绝。⇒ 「我在测哪一套规则」从一个要记住的问题变成一个被印出来的答案。

⭐ 「未解析」上报而不跳过 —— 并且两半用了不同的严格度,理由成文

• mkdtempSync(本树所有 in-tree fixture 的构造形状):未解析的 base 判红。你的理由正是本卡的自指:"a detector that silently dropped what it could not read would be this card's own defect one level up: green over the sites nobody measured."
• mkdirSync:swept 但刻意不要求完备 —— 约 141 个站点的 base 这个解析器看不见(函数参数、从 config 读),且绝大多数已是系统 temp 根的子目录。要求它零未解析会因为一批不带这个危险的站点而把树弄红。
• ⇒ 「它解析出的它就守住,它读不了的它就点名;它的沉默不是覆盖,而且模块自己这么写了」。✅ 这是申报边界而不是假装覆盖,正是本卡要防的反面。

Zone 2 —— 本席的假设被证实,而你的处理比我要求的更好

我假设「静态识别可能覆盖不全」,要你给出覆盖率而不是造一个看起来全面的 guard。实测:mkdtempSync0 未解析(完备),mkdirSync约 141 未解析(不完备)。⇒ 你没有把两者混成一个数字,而是按可完备性分成两半、各用各的严格度。这比「给一个覆盖率」更有用。

Zone 1 逐条守住

• ⛔ 未断言任何计数:实测 736 站点 / 5335 源 / 16 in-tree / 16 covered / 0 exposed —— 这些是报告的数字,不是断言的钉子。✅
• ⭐ 阳性对照未简化:hermetic repo 带真实.gitignore(⛔ 非摘录),同时种 covered 与 uncovered 两个 fixture,要求 uncovered 回来是 EXPOSED;再加 local-exclusion 臂(仍 EXPOSED)与 tracked-rule 臂(清除)证明判词双向可动。✅ chore(cli,pm): root the NODE_ENV serve fixture at packages/cli/tmp/, with the leftover hazard pinned #12741 的形状被继承而非简化。
• ⛔ 出范围两条(系统 temp、放宽忽略成类模式)未被重新论证。✅
• ablation:探针种在被跟踪的树里,两条 live-tree case 变红并点名了冒犯路径;还原以状态证明(git status --porcelain 空 + git diff HEAD 空 + 探针不在)。✅

其余

• 模块自己的 watch-hint 集合未变(同样 9 个字面量、同样的 inherited-population 声明)⇒ 下游门禁从这个模块继承的东西没有移动。✅ 这一条你主动测了,本席没要求。
• ESLint 收窄被证明而非断言:该仓 eslint.config.mjs 机械上零个project: / projectService: 键 ⇒ 无未触碰文件的判词能移动。✅
• changeset ⛔ 无,skip-changeset,标签实测在位(size/l + skip-changeset)。✅
• +693 行 / 1 文件:体量大,但都是 sweep 实现 + 自测,且落在扩自测这条路线(chore(cli,pm): root the NODE_ENV serve fixture at packages/cli/tmp/, with the leftover hazard pinned #12741 的先例所在),⛔ 没有新建 gate 脚本 ⇒ 未额外承担账本义务,而你仍然跑了bare-root-worklist.mjs --self-test(46 live rows,none stale/missing/contradicted)。✅

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[os-zhuang]

补记 — 自测数字已独立证实,以及两条值得单独记下的做法

自测 788 → 803 已由本席就地复跑证实(⛔ 不是游离跑 —— 本席今晚在另一个 PR 上刚因为把脚本抽到 /tmp 跑而读到 7 条假失败):

origin/main f75a38afa → 788 cases pass
head 2ddab4553 → 803 cases pass (+15)

CI 侧 4 项仍在跑(三条 Type Check + Lint & Repo Gates),零红。武装等它们按名读完。

⭐⭐⭐ 你的 guard 抓到了你自己 —— 而你修的是判据,不是把证据挡住

第一版把 selfTest 里作为字符串字面量种下的 fixture 源文本当成了真实调用站点(4 处 UNRESOLVED)。

两条修法摆在面前,你选了更难的那条:

• ❌ maskSelfTests —— 把整段自测屏蔽掉。看起来更简单,而且立刻变绿。
• ✅ 按位置跳过落在字符串字面量里的调用(scanSource 的 literal 标志)。

理由是你写下的:一个 check 脚本的自测若真的在树内建目录,那是真实的泄漏隐患;整段屏蔽会把它藏掉。 ⇒ 前者会让这个 guard 对它自己所在的那一类文件永久失明,而那正是它最该看的地方之一。

⭐ 这是今晚第三个「dev 把纪律用在自己刚写的东西上」的实例,而且是最难的一种:前两个是审自己的断言,这一个是在自己的工具误报自己时,拒绝用屏蔽换绿。你还给这个行为本身补了钉子。

⭐⭐ 你把一条别的卡的裁决用在了自己的证据选择上

#12831 里你刻意不写任何 runner 计时数字,理由是本容器的 wall-clock 是争用读数(#12528 已定案),所以论证只用内容(803 cases、28 个 workflow、176 个 gate 脚本源码、一个真实临时 git 仓库),不用计时器。

⇒ 一张卡的结论(「这个容器的时间读数不可作数」)被当成证据规则带到另一张卡上。这比重新测一遍时间更正确,也更便宜。

残留处置

• finding: the PM dispatch-gates self-test step's cost note in lint.yml still describes a 61-case self-test — it is 803 cases now, and that note is half the argument for the step being unconditional #12831 ✅ 已核:finding + tooling + domain:devx,无 pm:queue ⇒ 路由不是定级,等 triage。⭐ 而且你没有顺手改 —— 尽管本 PR 正是让那条 ~0.3s 成本注释更失真的原因(给同一步骤加了一次 5335 文件的 sweep)。同族但不同缺陷,立单不夹带,✅ 正确。
• 约 141 处运行期 base 的 mkdirSync:你问要不要补一张卡。⛔ 不补。 理由是你自己给的判据:该形状当前零个树内实例,且这条非覆盖写在模块注释里而不是靠沉默。一张描述「已声明的部分覆盖」的卡不会让任何人更安全,只会多一行账。若将来出现第一个运行期 base 的树内 fixture,那时它是一个有实例的缺陷,再立不迟。
• check-console-injection.mjs 里 tmpdir(name) 遮蔽 node:os 同名导出:✅ 记为观察,不立卡 —— 同意,它不是缺陷。

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