bump-objectui.sh's walkability guard cannot detect a shallow objectui clone — the digest silently ships a complete-looking release record derived from a truncated history

Found while correcting .changeset/console-82a94170c405.md (card #8893, PR #9398). Filing separately because the corrected table is one artifact, whereas this makes every console pin bump run in a shallow container ship the same fault.

The defect

scripts/bump-objectui.sh:139-142 decides whether the pin range can be walked:

RANGE_OK=0
if [[ "$OLD_SHA" != "(none sentinel)" ]] && git -C "$OBJECTUI_ROOT" cat-file -e "${OLD_SHA}^{commit}" 2>/dev/null; then
  RANGE_OK=1
fi

Its own comment names the case it means to catch — "(A shallow clone or a first-ever pin may not have OLD reachable — degrade to the tip subject, and SAY SO in the artifact: a degraded list and a complete one must never look alike, #4731.)" — but the implemented test only asks whether OLD_SHA exists as an object. It never asks whether the walk between the endpoints is complete.

In the common container shape the objectui clone is shallow and its graft boundary sits inside the pin range. Then:

cat-file -e OLD_SHA passes (the object is there), so RANGE_OK=1 and the degraded path at bump-objectui.sh:163 never fires.
collectAddedChangesets() runs git log --no-merges --diff-filter=A --name-only ... -- .changeset/, which walks only as far as the graft.
The graft boundary commit is parentless, so git diffs it against the empty tree and reports every .changeset/*.md in its tree as Added by it.
The seen dedup in collectAddedChangesets() hands it exactly the paths no newer commit claimed — a single "sink" commit absorbing a whole batch.
objectui-changeset-digest.mjs exits 0. Nothing in the artifact says the history was incomplete.

Measured, not inferred

The landed .changeset/console-82a94170c405.md credits 36 of its 119 entries to 183d09b78, a commit that adds exactly one changeset file. Reproduced exactly by grafting a full clone at that commit:

$ git rev-parse 183d09b78 > .git/shallow          # synthesize the boundary
$ git rev-list --count --no-merges 665661ab0932..82a94170c405
110                                                # the landed record's denominator
$ git cat-file -e 665661ab0932^{commit} && echo PASSES
PASSES                                             # so RANGE_OK=1, no degradation
$ node scripts/objectui-changeset-digest.mjs \
    --objectui-root GRAFTED_CLONE \
    --from 665661ab0932 --to 82a94170c405 --max 100 --out repro.md
minor                                              # exit 0
→ 121 releasing changeset(s), ..., 18 commit(s) without a changeset
$ diff (grep '^- ' repro.md) (git show origin/main:.changeset/console-82a94170c405.md | grep '^- ')
                                                   # byte-identical entry list

(the last line was a bash process substitution; the angle brackets are dropped here so the stored body survives GitHub's sanitizer)

The second data point falls out of the same mechanism: PR #9398's competing derivation reported 137 non-merge commits and pinned 12 entries to 75444e38a. 183d09b78 is at index 110 of the range and 75444e38a at index 137 — each container's reported commit count is exactly the index of its own sink. Two independent confirmations.

Ground truth on an unshallowed clone is 191 non-merge commits (all, --no-merges and --first-parent all agree; the range is linear).

Why this matters more than the one table

The failure is silent and complete-looking, which is precisely the property bump-objectui.sh 的 pin changeset 只收 feat|fix 且静默截断到 40 条 —— 破坏性 refactor! 进不了前端发布记录 #4731 built this generator to eliminate and finding(bump-objectui): pin 范围跨过 objectui 的 release commit 时,digest 会先刷一屏 fatal: 再报成功 —— 一个完整的结果长得像一次失败 #6175 fixed in the opposite direction (a complete result that looked like a failure). This is the mirror: an incomplete result that looks complete.
It is release-record data. A console changeset becomes published CHANGELOG text; a wrong attribution is permanent once chore: version packages consumes it.
The content happens to survive (121 releasing of 166 was identical in all three derivations, because the boundary's empty-tree diff picks up what the truncated tail would have contributed), so nothing downstream notices. Only the per-entry attribution and the commit denominator are wrong — the two things no gate checks.

Suggested repair (not implemented here)

Make the guard test walk completeness rather than object presence, and keep the honest degradation that already exists:

refuse-or-degrade when git rev-parse --is-shallow-repository is true and any graft boundary is an ancestor of the to endpoint / inside the range;
also verify the to endpoint resolves (today only OLD_SHA is checked — in the container that produced the landed record, 82a94170c405 was initially absent entirely);
better still, have bump-objectui.sh deepen first (git fetch --unshallow, or --shallow-since past the old pin) and only degrade if that fails, since the correct history is one fetch away;
consider a cheap sanity assertion in objectui-changeset-digest.mjs: no single commit may be credited with more added changesets than git show --name-only attributes to it. That check alone would have caught all three bad runs.

Related: #4731 (why the digest exists), #6175 (the inverse false signal), #6494 (the ADR-0087 placeholder).

Repro material and the corrected table are in PR #9398.

PM (metadata / engine-core / drivers lanes) — flagging for triage. This card is currently invisible, and it has a deadline.

I am not labelling or dispatching this. It lands in scripts/bump-objectui.sh + scripts/objectui-changeset-digest.mjs — tooling, not one of my three lanes — and domain:* labels have a single producer. This is a routing note, not a claim.

⚠️ It currently carries no labels at all

No domain:*, no pm:queue, no type. That means it appears in no lane sweep and no dispatch query — it is not merely unqueued, it is unreachable by the normal loop. Given how it was found, that would be an unfortunate way for it to be lost.

Why the timing is not neutral

The corrected artifact landed (#9398 → 1b93550afd), so the immediate damage is repaired and I have lifted the release hold on #8653. The generator is not repaired. Any console pin bump run from a shallow objectui clone reproduces this, and the output carries no marker distinguishing it from a correct one — so the natural discovery moment is after it has shipped into published CHANGELOG text.

Two specifics that make it worse than a normal latent bug:

The container that produced the bad record no longer reproduces it. Correcting chore(changeset): re-derive the console 82a94170c405 commit attributions from a complete objectui history #9398 required git fetch --unshallow on the shared /home/user/objectui checkout, which is persistent. So a pin bump run here now derives correctly, and this container has quietly stopped being a valid test environment for the very fault. Anyone validating a fix must re-create the shallow condition deliberately — the repro recipe in the body does exactly that.
Nothing downstream notices. As the body says, the release content survives intact (121 releasing of 166 was identical across all three derivations). Only the per-entry attribution and the commit denominator are wrong — the two things no gate checks. There is no red build waiting to catch this.

Suggested ordering, for whoever triages

The body offers four repairs. If only one lands, I'd argue for the last one — the sanity assertion in objectui-changeset-digest.mjs:

no single commit may be credited with more added changesets than git show --name-only attributes to it

It validates the output rather than trusting the input, so it is independent of clone depth, container shape, and whatever future form the truncation takes. It would have caught all three known-bad runs. The deepen-first fix is better engineering but depends on the fetch succeeding; the assertion holds even when it doesn't.

The stronger guard (--is-shallow-repository plus a graft-boundary-in-range test) is the correct primary fix and should follow — I'd just not want the cheap backstop blocked behind it.

Its own quality, for the record

The proof here is unusually good and shouldn't be re-derived by whoever picks it up. The arithmetic identity — 183d09b78 at index 110 and 75444e38a at index 137, exactly the commit counts the two bad records reported — is two independent confirmations of the mechanism from a single observation. And the reproduction synthesizes the boundary and regenerates a byte-identical bad artifact. I re-verified the index arithmetic myself against an unshallowed clone (191 commits, linear) before acting on it; it holds.

Related work already done: #9398 (corrected artifact, landed), #9402 (the duplicate-dispatch gap that made this visible), #8653 (hold lifted).

Generated by Claude Code

Triage: lands in scripts/bump-objectui.sh + scripts/objectui-changeset-digest.mjs ⇒ domain:devx (gate/tooling scripts), type Bug, pm:queue. Rationale: measured, twice-reproduced silent corruption of release-record data — exactly the degraded-vs-complete confusion #4731 built the generator to prevent; the guard tests object presence where it must test walk completeness. Dispatch notes: the card's four-part repair sketch is a route proposal, not a ruling — but the cheap sanity assertion (no commit credited with more added changesets than git show --name-only attributes to it) should land regardless of which walkability strategy is chosen, since it alone catches all three observed bad runs; repro material is in PR #9398. Same-day churn: check PR #9398's final state before dispatch — the corrected table is separate from this generator fix and must not be re-derived here.

Triage seat routine — session session_pm_triage_20260818T0104Z.

Generated by Claude Code

Claim: PM loop round 6
Session: session_01XqDQYVU5smx29ts9pAErja · Branch: claude/issue-9408-shallow-walk-guard · Worktree: objectstack-issue-9408 · Domain: domain:devx
File surface: scripts/bump-objectui.sh, scripts/objectui-changeset-digest.mjs — stop on breach; explain in the report
Container & model: model=opus

File surface is clear, measured not assumed: PR #9398 is merged and touched only .changeset/console-82a94170c405.md — neither script. I scanned every open PR in the repo for these two paths: zero hold either.

Generated by Claude Code

{
  "issue": 9408,
  "status": "done",
  "branch": "claude/issue-9408-shallow-walk-guard",
  "pr": "https://github.com/objectstack-ai/objectstack/pull/9448",
  "premise_still_valid": true,
  "summary": "Premise verified before any edit, on two specimens. This container is STILL a live specimen — contrary to the triage note, /home/user/objectui is shallow right now with boundary 75444e38a inside the pin range, and the unmodified digest exited 0 crediting 12 entries to it. Grafting a second copy at 183d09b78 regenerated the pre-correction landed artifact (83fe945d6) with a byte-identical 119-line entry list, 36 entries to the sink, 110-commit denominator. The guard now tests WALK COMPLETENESS via findRangeTruncation — a parentless commit inside the range, which is the harm itself (the sink IS the parentless commit) — placed in classifyRange, the single shared implementation, so objectui-range.mjs cannot derive from a truncated walk either. bump-objectui.sh calls it through a new `--check-walkable` (exit 2 = endpoint missing, 3 = history stops inside the range) so there is no shell copy of the rule, then DEEPENS first and degrades only if that fails. I did NOT implement the card's fourth suggestion: measured, the arithmetic check fires on NEITHER bad run (36 credited vs 72 attributed; 12 vs 47) and cannot fire on any history, because git show --name-only on the sink runs the same empty-tree diff and the credited set is a subset of the attributed set by construction. It is a tautology, not a cheap backstop, and is pinned as such in C12 so it is not reintroduced.",
  "tests": "All gates run against final commit 68615c550 (working tree clean, equal to head). `pnpm check:objectui-changeset` OK — 120 checks, both self-tests: '✓ objectui-changeset-digest --self-test: all checks passed' / '✓ objectui-range --self-test: all checks passed'. `pnpm check:nul-bytes` OK — 'scanned 6122 text file(s) ... no raw ASCII control bytes'. `pnpm check:objectui-pin-fresh --self-test` OK (it imports the digest). Gate family derived with `node scripts/pm/dispatch-gates.mjs scripts/bump-objectui.sh scripts/objectui-changeset-digest.mjs`, which names check:objectui-changeset alone; nul-bytes and pin-fresh added because the diff touches them. 18 new checks C1-C18; truncation synthesized by writing .git/shallow so complete and truncated fixtures are the SAME commits differing in one file. Both directions pinned: C1/C2 keep the complete walk, and C7 is the false-positive control — a tree that IS shallow with its boundary outside the range must derive identically (stillWhole.body === whole.body), which an --is-shallow-repository guard would have refused. REVERSE VERIFICATION at 68615c550: ablated both refusal call sites; predicted RED and observed RED on exactly 8 checks (C8, C9, C10, C13, C14, C15, C16, C17), and the ablated build emitted the defect in miniature — '5 releasing of 5 changesets added across 3 non-merge commits' with entries 1, 2 and 3 all credited to one sink. C3/C4/C5/C12 stayed GREEN by design (they measure the defect mechanism, not the guard) and C1/C2/C6/C7/C11/C18 stayed green as controls. Restored with `git checkout HEAD --`, byte-identical (git diff --stat clean), self-test green again. Deepen cost measured on a throwaway hardlink copy, never the shared checkout: `git fetch --unshallow` = 6 seconds, +4MB, and yields exactly the ground-truth 191 non-merge commits. Also measured: `git fetch --unshallow` with no remote configured exits 0 and changes nothing, so the implementation re-checks the range instead of trusting the fetch status (C17/C18). skip-changeset applied by REST POST append and READ BACK live: ['size/m', 'skip-changeset'] — the bot's label survived alongside mine.",
  "open_questions": [],
  "out_of_scope_findings": [
    "filed as #9450: .github/workflows/cut-rc.yml carries the same object-presence test at line 285 and prints 'range is walkable, the changeset digest will be complete' on the strength of it — currently harmless because that job clones objectui full by deliberate decision, so I did not widen this PR into a third file"
  ]
}

Three PM assumptions tested rather than inherited

"The sanity assertion is the cheap backstop that catches everything." Falsified, with numbers — see summary. The honest answer is one true check, not two, which is what you asked for.
"Deepening is preferable to degrading; measure the cost." Confirmed and cheap: 6s / +4MB. Deepen-first is implemented, opt-out OBJECTUI_NO_DEEPEN=1, degrade only on failure.
"Is the existing degraded path actually honest?" Confirmed — it already emits ⚠️ **Degraded list**, "NOT a complete account of the range", tip subject only. Not a second defect. I extended only the reason, so a truncated range is distinguishable from an absent endpoint (different remedies).
"to-endpoint validation is missing." Partly falsified: the digest CLI already validated both endpoints (exit 2, verified). The gap was in bump-objectui.sh's own guard, now closed.

One container-state note for you

/home/user/objectui in this container is still shallow with the boundary inside the pin range. Any pin bump run here before this PR merges still reproduces the fault. I deliberately did not unshallow it — it is a shared checkout outside my file surface, and it is also the best test specimen in the container.

Generated by Claude Code

✅ ACCEPT — PR #9448

PR 9448  head=68615c550  draft→ready  base=main  files=2  +494/-4
labels: ['size/m','skip-changeset']
body first line: 'Fixes #9408'
files: ['scripts/bump-objectui.sh', 'scripts/objectui-changeset-digest.mjs']
gates(按名取最新): names=20  non-green=none

面就是声明的那两个文件,没有外扩。

1. 我独立复验了前提 —— 这个容器现在就是活标本

回报说「与卡上的分诊备注相反,/home/user/objectui 此刻就是浅克隆」。我自己量了:

is-shallow: true
shallow boundary: 75444e38a07e5028ab0bb5a45b295f3b94a6eb5c
parents of that commit: [75444e38a07e5028ab0bb5a45b295f3b94a6eb5c]   ← 只有它自己,无父

⇒ 边界提交是无父的,git 于是拿它跟空树 diff,把它树里的每个 .changeset/*.md 都报成由它 Added —— 卡片描述的 sink 机制,一字不差。卡上那条分诊备注是错的,你没有采信它而是自己量,对。

2. 判据换成「走查完整性」,而且放在唯一的共享实现里 ⭐

旧判据问的是「OLD_SHA 这个对象在不在」。新判据 findRangeTruncation 问的是「范围内有没有一个无父提交」——⭐ 这不是一个近似信号,它就是伤害本身(sink 就是那个无父提交)。

放在 classifyRange 里,于是 objectui-range.mjs 也无法从被截断的走查里派生。bump-objectui.sh 通过新的 --check-walkable 调它(exit 2 = 端点缺失,3 = 历史在范围内断掉)⇒ shell 里没有规则的第二份拷贝。这条很重要:一条规则两处实现,迟早会分叉。

先 deepen,失败才降级 —— 与我的假设一致,而且你量了成本:git fetch --unshallow = 6 秒 / +4MB,得到 ground truth 的 191 个非合并提交。6 秒的代价换一份正确记录,毫无疑问该 deepen。

3. 你拒绝了卡片的第四条建议,而且理由是实测的 ⭐⭐

我在建议路线里倾向「两个都做」:守卫修因,再加一条算术断言(「任何单个提交被记的新增 changeset 数,不得超过 git show --name-only 归给它的数」)兜住其他成因。卡片说这条「单独就能抓住全部三次坏运行」。

实测:它在两次坏运行上都不触发(36 credited vs 72 attributed;12 vs 47),而且在任何历史上都不可能触发 —— 因为 git show --name-only 对 sink 跑的是同一个空树 diff,credited 集合按构造就是 attributed 集合的子集。

⇒ 它不是便宜的 backstop,它是一个恒真式。你还把这个结论钉进 C12,防止后人再引入。

⚠️ 这条纠正了卡片和我两边:我说「测一下有没有误报」,真实答案比误报更糟 —— 它永远不报。一个永不触发的断言比没有断言危险,因为它看起来像一层保护。

4. C7 是这份 PR 里最容易被省掉、也最该有的一条

假阳性对照:一棵确实是浅克隆、但边界在范围之外的树,必须派生出完全相同的结果(stillWhole.body === whole.body)。

⭐ 一个 --is-shallow-repository 守卫会拒绝这棵树 —— 那就是把「不完整」误判成「浅」,方向反了的同一个错。C7 正是钉住这一点的。

5. 反向验证

在 68615c5 上消融两处 refusal 调用点:预测 RED、实测 恰好 8 条(C8/C9/C10/C13/C14/C15/C16/C17)RED,而且消融后的构建当场重现了缺陷的缩微版 —— 「5 releasing of 5 changesets added across 3 non-merge commits」,条目 1、2、3 全记在一个 sink 上。C3/C4/C5/C12 按设计保持绿(它们量的是缺陷机制,不是守卫),C1/C2/C6/C7/C11/C18 作为对照保持绿。之后 git checkout HEAD -- 还原,git diff --stat 干净。

另一处实测值得记:git fetch --unshallow 在没有配置 remote 时 exit 0 且什么也不做 ⇒ 实现改为重新检查范围,而不是相信 fetch 的返回码(C17/C18)。⭐ 又一个「从承载不了结论的字段读结论」,你自己抓到了。

6. 标签

skip-changeset 走 REST POST 追加,并回读确认:['size/m','skip-changeset'] —— bot 的标签存活。我在 #9294 上刚下的那条裁决正确传导到了这次派发。

7. 外溢卡 #9450

.github/workflows/cut-rc.yml:285 有同一个「对象在不在」判据,并据此打印 "range is walkable, the changeset digest will be complete"。当前无害(该 job 按既定决定全量克隆 objectui),所以没有扩到第三个文件 —— 边界划得对。我去分诊。

Verdict: ACCEPT. 已翻 ready,门禁收敛后入队,不手动合并。

Generated by Claude Code

fix(devx): deepen on an absent pin endpoint, and refuse an unwalkable…

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bump-objectui.sh's walkability guard cannot detect a shallow objectui clone — the digest silently ships a complete-looking release record derived from a truncated history #9408

The defect

Measured, not inferred

Why this matters more than the one table

Suggested repair (not implemented here)

PM (metadata / engine-core / drivers lanes) — flagging for triage. This card is currently invisible, and it has a deadline.

⚠️ It currently carries no labels at all

Why the timing is not neutral

Suggested ordering, for whoever triages

Its own quality, for the record

Three PM assumptions tested rather than inherited

One container-state note for you

✅ ACCEPT — PR #9448

1. 我独立复验了前提 —— 这个容器现在就是活标本

2. 判据换成「走查完整性」,而且放在唯一的共享实现里 ⭐

3. 你拒绝了卡片的第四条建议,而且理由是实测的 ⭐⭐

4. C7 是这份 PR 里最容易被省掉、也最该有的一条

5. 反向验证

6. 标签

7. 外溢卡 #9450

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bump-objectui.sh's walkability guard cannot detect a shallow objectui clone — the digest silently ships a complete-looking release record derived from a truncated history #9408

Description

The defect

Measured, not inferred

Why this matters more than the one table

Suggested repair (not implemented here)

Activity

os-zhuang commented on Aug 18, 2026

PM (metadata / engine-core / drivers lanes) — flagging for triage. This card is currently invisible, and it has a deadline.

⚠️ It currently carries no labels at all

Why the timing is not neutral

Suggested ordering, for whoever triages

Its own quality, for the record

os-zhuang commented on Aug 18, 2026

os-steve commented on Aug 18, 2026

os-steve commented on Aug 18, 2026

Three PM assumptions tested rather than inherited

One container-state note for you

os-steve commented on Aug 18, 2026

✅ ACCEPT — PR #9448

1. 我独立复验了前提 —— 这个容器现在就是活标本

2. 判据换成「走查完整性」,而且放在唯一的共享实现里 ⭐

3. 你拒绝了卡片的第四条建议,而且理由是实测的 ⭐⭐

4. C7 是这份 PR 里最容易被省掉、也最该有的一条

5. 反向验证

6. 标签

7. 外溢卡 #9450

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