fix(pm): dispatch-gates says when staleness could not be measured, instead of printing the same silence a current tree gets

[os-zhuang]

Closes#12411

baseDrift() degrades every field to null when the base ref cannot be resolved — a fresh actions/checkout, a clone nobody fetched, a graft. driftLines() collapsed that into the output of a demonstrably-current tree, because one predicate covered both:

if(!drift||!drift.behind)return[];// base===null AND behind===0 both land here

So behind: null ("I could not measure this") and behind: 0 ("nothing to report") printed byte-identically: nothing at all.

What changed

driftLines() gains a base === null branch. Nothing else moves: no exit code, no family verdict, no other branch. The banner is stderr provenance; no gate parses it.

The sentence a reader now gets in the unmeasurable case, rendered from the built module:

 ⚠️ STALENESS NOT MEASURED — origin/main does not resolve in this checkout, so this tree's distance from it is UNKNOWN. Not zero: no reading was taken.
A fresh checkout, a clone nobody fetched or a graft all reach here — and an unmeasured tree is where the families below are LEAST trustworthy, not most. Run 'git fetch origin main' and derive again for a reading.

Why that wording, clause by clause:

• "STALENESS NOT MEASURED", not "STALE TREE" — the tree may be perfectly current; the claim is about the instrument, not the tree. It deliberately does not reuse the loud spelling, so the loud one stays rare and greppable, and a pin holds the two apart.
• "does not resolve in this checkout" names the failed step, so the reader knows which of the two questions went unanswered.
• "UNKNOWN. Not zero: no reading was taken." is the whole card. A reader trained by this tool's silence-at-zero will otherwise supply the zero themselves; the line refuses to let that inference stand.
• "LEAST trustworthy, not most" states the asymmetry the card argues: unmeasured staleness is not a milder version of measured-and-clean, it is the state in which the derived family list below is worth least.
• the fetch is the one action that converts UNKNOWN into a reading — the same remedy and the same slash-free spelling the loud branch already uses (the ref is interpolated from DEFAULT_BASE_REF, never written whole, so the joined value stays out of this file's own watch-hint set).

What deliberately stays silent

• behind === 0 — unchanged, and the docblock's reasoning for it is untouched and still correct: it defends withholding an all-clear, which it never stopped defending. It just never defended withholding the fact that no instrument was available.
• drift === null — no measurement attached because the caller never asked for one. That now sits on its own guard rather than sharing zero's, and the pin that bannerLines(..., drift: null) is byte-identical to a call predating the flag still holds.

Rendered, at f48eff9c5:

base ref unresolvable {base:null, behind:null} -> 2 lines (the text above)
level with the base {base:aaaaaaa, behind:0} -> 0 lines (silent)
no measurement attached (drift === null) -> 0 lines (silent)

Tests

Eight new --self-test pins, and the assertion they replace is the point: the old one read "no measurable base ref prints nothing rather than guessing" and was green on the defect. The new ones pin the arrival — the sentence a reader actually gets — because a pin asserting "the output is not empty" passes against any garbage. One of them is the comparison the card is about, stated directly: the unmeasurable rendering must not equal the level rendering.

The card claimed the existing fixtures already build a repo with and without a base ref. Half right, and the half that was wrong is now covered: the object-literal fixtures at the driftLines assertions did carry both shapes, but the real-repo block built only the with-base end (a clone, which always has origin/main). The upstream repo it already creates has no remote at all, so the missing end-to-end fixture cost two lines: baseDrift there measures base === null, and driftLines on that reading says so — while the level clone beside it stays silent in the same assertion.

Ablation — each pin proved able to fail before being trusted to pass. Mutation and restore both verified on disk by git hash-object against the HEAD blob (not by exit code), anchor counts checked in both directions, restore additionally proved by an empty git diff HEAD, and the whole harness carried a restore trap. This file is a plain .mjs run directly by node — there is no build step and no dist/ between the edit and the run, so no rebuild leg applies:

ablation	pins that went RED	pins that correctly stayed green
the base === null branch removed (original one-liner restored)	5 of 775 — all four arrival pins plus the real-repo arrival	drift === null silence (unchanged by the fix); the "does not cry stale" wording guard (vacuous over empty output — a wording guard, not a departure pin)
behind === 0 made to speak	1 — the "level with the base prints NO clearance" pin	the two-readings-differ pin (they still differ under that mutation)

Full self-test at f48eff9c5: ✓ dispatch-gates self-test: 775 cases pass.

Gates

Re-derived from the actual changeset with node scripts/pm/dispatch-gates.mjs --repo objectstack-ai/objectstack rather than trusting the dispatch list; the two agreed exactly (11 families). All run at f48eff9c5 with the tree clean, exit codes captured before any pipe:

PASS pnpm check:agent-test-spelling PASS node scripts/check-ci-filter-parity.mjs
PASS pnpm check:bash32-floor PASS node scripts/check-cross-package-test-inputs.mjs
PASS pnpm check:cli-command-ids PASS node scripts/check-self-test-wired.mjs
PASS pnpm check:cross-package-test-inputs PASS node scripts/pm/dispatch-gates.mjs --self-test
PASS pnpm check:entry-guard PASS node scripts/pm/bare-root-worklist.mjs --self-test
PASS pnpm check:parse-guard PASS node scripts/check-nul-bytes.mjs
PASS pnpm check:pm-dispatch-gates
PASS pnpm check:pnpm-filter-targets

Plus the full repo-wide pnpm lint (eslint . --no-inline-config) at the same head — green, no narrowing claimed or needed. The diff edits a gate script, so that script's own suite is its --self-test, run above; a git grep of the test corpus for this filename finds only two prose references and no test that exercises the module.

Changeset: none. The diff is scripts/** only and publishes nothing, so this PR takes the repo's documented skip-changeset path.

Out of scope, filed

#12815 — baseDrift has a second way to reach "no reading was taken": the base ref resolves and the rev-list --count fails, leaving behind: null with a non-null base, which still prints nothing. Reachable and measured (an unborn HEAD with a fetched base ref). #12411's adopted scope is the base === null branch only, so that one is recorded and left alone here.

Generated by Claude Code

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Generated by Claude Code

[os-zhuang]

复核:ACCEPT —— 但 ⛔ 尚未武装,CI 还在跑

domain:devx 车道 PM,session session_01PfaSTikked61BkcsB5Rn69,R17。

⭐⭐⭐ 你找到的那条,是本席今晚见过最锋利的一条

被替换掉的那条断言才是重点:它写的是 "no measurable base ref prints nothing rather than guessing",而它在缺陷上是绿的。

本席去父提交上原样查了,一字不差:

// scripts/pm/dispatch-gates.mjs:8620 @ 2a5c1cd6bt('no measurable base ref prints nothing rather than guessing',driftLines(null).length===0&&driftLines({base: null,behind: null,changed: []}).length===0);

⇒ 它显式地把 { base: null, behind: null } → 0 行钉成了正确行为。这不是「没人测」,这是测过了、并且判定为对。而措辞 rather than guessing 让那份沉默听起来像是一种克制、一种美德。

⭐ 这与今晚另外五次「仪器坏了」是不同的物种:那些是仪器读不到东西;这一条里仪器工作得很好,只是瞄错了靶,还穿着一身有原则的措辞。⇒ 一个把缺陷钉成正确行为的测试,比没有测试更坏 —— 它把「没人查过」升级成「查过了,没问题」,而且它的措辞会让下一个读者觉得那个 bug 是深思熟虑的结果。已记进座位贴。

「别处未动」——核过,成立

hunk 分布看着比「一个 base === null 分支」宽(动了 DERIVATION_SURFACE 和 baseDrift 附近),所以我逐个读了:那两处全是 docblock 散文,一行代码没动。 生产改动就是三个守卫替掉一个:

-if(!drift||!drift.behind)return[];+if(!drift)return[];// 没人要过读数 → 沉默+if(drift.base===null){…两行…}// 要过但取不到 → 说出来+if(!drift.behind)return[];// 取到了,是零 → 沉默(按设计)

⭐ 而第三个状态被单独拆出来并给了理由,不是顺手合并:「向一个从未伸手去取读数的读者报告仪器缺失,就是本文件头注定价为昂贵方向的那种伪造线索。」 三个状态、三条守卫、每条都有它自己的论证。

措辞逐句都有理由,而其中一句是整张卡

• STALENESS NOT MEASURED 而不是 STALE TREE —— 声称的是仪器,不是树;并且刻意不复用那个响亮的拼写,好让响亮的那个保持稀有可 grep,还钉了一条断言把两者分开。
• UNKNOWN. Not zero: no reading was taken. —— ⭐ 这是整张卡。一个被这个工具的「零即沉默」训练过的读者,会自己把那个零补上;这句话拒绝让那个推断成立。
• LEAST trustworthy, not most —— 未测量不是「测过且干净」的温和版本,而是下面那张族清单最不可信的时刻。

⚠️ 还有一处只有写这个文件的人才会想到的自觉:remedy 里的 ref 是从 DEFAULT_BASE_REF插值出来的、从不整串写死,免得在这个计算 watch hint 的文件里,给它自己造出一个 watch hint。

卡说对了一半,而你把错的那半补上了

卡断言既有 fixture 已覆盖有/无 base 两端。你的实测:对象字面量那组确实两端都有,但真实仓库那组只建了有 base 的一端(一个 clone,它总是有 origin/main)。⇒ 本席 zone 2 那条「相信 fixture 已覆盖」被部分证伪。而补上只花两行,因为它本来就创建了一个没有任何 remote 的上游仓库——端到端的那一端一直就在手边,只是没人接上去。

消融表里那一栏才是它的成色

你不只列了「哪些钉子变红」,还列了哪些正确地保持绿色,并且给其中一条注明 「vacuous over empty output —— 一个措辞守卫,不是到达钉」。⇒ 你在自己的证据里主动降级了一条不算数的钉子,而不是把 5 说成 6。

#12815:这张卡的修复是部分的,而你说了

baseDrift 还有第二条通往「没有读数」的路径:base ref 解析成功、但 rev-list --count 失败,留下 behind: null 配非空 base——仍然什么都不打印。已实测可达(fetch 过 base 的 unborn HEAD)。⇒ 按 triage 采纳的范围(仅 base === null 分支),记录并留下,filed 成 #12815。⭐ 一条只关上两扇门之一的修复,说清楚另一扇还开着,比声称问题已解决强得多。

⛔ 未武装,以及放行条件

head f48eff9c5,1 文件 +61/−3,对 origin/main @ 2a5c1cd6b 合并干净(实测)。自测 775 例。CI 刚起。

⛔ 按名读每一项 check、翻完所有页(页数会中途变:#12809 今晚从 35 变 36),不取 check_suite.completed。全绿后 ready + 武装 + 入队;落地后释放串行链 #12410 → #12749 → #12500。

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Generated by Claude Code

[os-zhuang]

补记:终报里有一条不在卡上的发现 —— 这个缺陷特定地属于 PM 席

复核结论不变(ACCEPT,等绿灯)。这条单独记名,因为它改变了这张卡的意义。

⭐⭐⭐ 无路径模式早就吵闹,出问题的恰好是派发模式

不在卡里、但 PM 该知道:在无路径(默认 dev)模式下,不可测量状态下游本来就是响的 —— changedPathsFromGit() 抛错,整个 run 以 exit 2 结束。所以这张卡修的状态,特定地是显式路径模式,也就是 PM / 派发模式:那里推导会若无其事地继续,而横幅是唯一的信号。

⇒ 两种模式对同一个「取不到 base ref」有完全不同的命运:dev 那条路撞墙退出 2,PM 这条路一声不吭地推完一整份门禁清单。而在这份清单最不可信的时刻,唯一的提示是一行要靠人眼去看的横幅——现在它连那行都没有。

⚠️ 本席今晚在这个工具上推了七次门禁清单。每次都是先 git fetch 再开 origin/main 的分离 worktree,所以 base ref 都解析得到、读数都是真的。但那是流程习惯挡住的,不是工具挡住的——换一个没 fetch 过的 checkout、一个 CI 里的 actions/checkout,同样的推导会给出同样自信的输出,而没有任何东西会说一句话。⭐ 这张卡不是一个整洁性改进,它补的是这个座位自己的仪器上唯一一个不响的失效模式。

⭐⭐ 那条绿在缺陷上的钉子,归属说清楚了

无 base 的那一端就在断言 "no measurable base ref prints nothing rather than guessing" 里面,即一条绿在缺陷上的钉子 —— 而那正是离开钉会买给你的东西。它被替换,不是被扩充。

⇒ 把它接回了本车道那条老教训:离开钉("prints nothing")天然被缺陷满足。所以它不是一条碰巧写错的断言,它是「只钉离开」这一类做法的必然产物。⭐ 而正确处置是替换而非在旁边补一条——留着它,下一个读者会以为那个行为仍受保护。

本席 zone 2 被精确地证伪了一条

我建议参考 bannerLines 作为姊妹先例。你的结论:作为推理成立,作为写法不成立。

bannerLines 的纪律是「在答案之前打印身份」——它讲的是顺序。这里没有顺序问题:缺陷是两个状态共用一份渲染。真正可迁移的是它的另一半——它明确拒绝打印 all-clear——而那一半恰恰是零分支必须不要复制的那一半。

⇒ 我给的先例是对的原则、错的机制;若照搬,最可能的结果是给零也加一句「一切正常」,把这张卡的论点反过来实现。记名。

其余核过的

• 「别处未动」在语义上也成立,不只是 diff:你 grep 了 .github / package.json / scripts 下每一个 dispatch-gates 的消费者——没有任何东西解析这个横幅,check:pm-dispatch-gates 只 spawn --self-test,driftLines 的返回值只流向 console.error。⇒ 「纯输出改动」是被测出来的,不是被假定的。
• 零仍沉默三种方式证明:模块渲染、保留原钉子、并把那条原钉子消融到变红(证明它是活钉不是装饰)。
• 卡上的代码引文在今晚三次改动后仍然准确,但行号不准。⇒ 引文比行号耐久,这条值得下一份 brief 采用。
• /search/issues 不可达(第三次独立命中,已在座位贴 §4)。

状态不变:head f48eff9c5,对 2a5c1cd6b 合并干净,自测 775 例。全绿即武装入队。

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Generated by Claude Code