fix: restore leading slash on git-mangled diff header paths (#2493) by bolichen97 · Pull Request #2517 · kirodotdev/KiroCrew

bolichen97 · 2026-08-10T10:06:47Z

Summary

Issue #2493 captured a dashboard file-read going out with the leading slash stripped from an absolute path (GET /api/file-read?path=home/<user>/…&resolve=1 → 400). The triage note confirmed the 400 is correct backend behaviour; the emitting call site was unidentified among the eleven fileReadUrl() callers.

Root cause (reproduced against real git): git joins its a/ b/ prefixes onto absolute paths, collapsing the leading slash — git diff --no-index /tmp/x /tmp/y emits +++ b/tmp/y. DiffBlock.extractFilePath() stripped the b/ prefix and handed the rootless remainder (tmp/y, home/<user>/…) to the HEAD existence probe, which fileReadUrl() correctly marked resolve=1 — the exact captured request shape. (The existing test suite even enshrined a b//home/… double-slash variant that real git never emits.)

Fix (frontend only — backend validation untouched)

extractFilePath() now reports whether a git a//b/ prefix was stripped, per header branch.
When the stripped remainder starts with a conventional filesystem root (/^(home|Users|tmp|var|opt|workplace)\//), DiffBlock nominates the rooted spelling and probes both spellings concurrently. The Open affordance appears only when exactly one exists — an ambiguous header (both files exist) gets no button rather than a guessed target, since Open leads to an editor a save can write through.
The confirmed spelling is keyed to the header it was measured for, so a mid-stream header change can never leave the button targeting a stale path (settled-before-abort race closed with an ac.signal.aborted check).
No silent path rewrite anywhere; genuine repo-relative home/… paths keep working; plain (prefix-less) +++ home/… headers are never reinterpreted; src/kiro_crew/dashboard/handlers/files.py unchanged.

Ruled out (all eleven fileReadUrl callers traced)

ToolCallLine/app-sdk (extractToolFilePath verbatim), chips/usePathKind (verbatim inline-code text), ChatPage tool-log scan (regexes require leading /), ActivityViewer (f.path verbatim), MarkdownPanel (path props), pathHint extraction (requires / or ~/), SearchPanel shortenPath (display-only, confirmed not feeding I/O).

Tested

New: 8 DiffBlock regression tests (rooted-wins, relative-wins, both-exist suppression, neither-exist, no-nomination for ordinary/prefix-less headers, header-while-pending, stale-path-on-header-change) + 5 direct fileReadUrl/fileDownloadUrl contract tests.
npx tsc -b clean; full npx vitest run: 877 files / 11,808 tests pass; jscpd 0 clones; isort/flake8/mypy clean (no backend files changed).
Pre-push dual-model review fleet ran (GPT 5.6 + Opus): both converged on 2 defects in the first cut (both-exist wrong-file risk, stale-path race) — both fixed and test-locked before push; Opus AUTOSDE blocking-rule sweep clean.

Closes #2493

Screenshots

Captured from a real browser rendering DiffBlock in the three contract states (rooted spelling exists on the stubbed backend):

Suppressed (hovered — still no Open)	Corroborated (Open present)

github-actions · 2026-08-10T10:08:09Z

UX Review (Fable 5) — ✅ PASS

Advisory UX-level review of 7d2a23dde0c8c9d9de448be354292f0041c22f6e — updated in place on each push; does not block merge.

The diff is frontend-only: DiffBlock.tsx path-extraction logic plus tests and three screenshots. The only user-visible surface is the hover-gated "Open" button on diff blocks — it now correctly appears for corroborated absolute paths and stays hidden (as it already effectively was, via the 400) for ambiguous headers. No new strings, no moved controls, no new states lacking coverage; screenshots match the rendered behavior. This is a clean pass.

UX-Verdict: PASS

Users only ever gain a correctly-targeted Open button; ambiguous headers stay button-less exactly as before, so nothing to comprehend, learn, or mis-trust.

[UX-REVIEWED] 7d2a23d

github-actions · 2026-08-10T10:08:44Z

Opus 4.8 Review — ✅ no blocking findings

Reviewed 7d2a23dde0c8c9d9de448be354292f0041c22f6e — this comment is updated in place on each push.

Review details

No findings.

FINDING — temp-screenshots/fix-2493/*.png — three binary debug screenshots (corroborated-open.png, diffblock-states.png, suppressed-no-open.png) are committed under a temp- path, permanently bloating repo history for no runtime purpose → Fix: drop these files from the PR.

The DiffBlock logic is sound: the ambiguous-rootless header is suppressed unless pathHint === '/' + extracted.path corroborates it, the abort race is closed by both the !ac.signal.aborted guard and the forHeader-keyed resolved state, and the corroborated absolute spelling is what both the probe and onFileOpen receive. (The PR description's "probes both spellings, exactly-one-exists" narrative is stale relative to the corroboration-only code actually shipped, but the code is internally consistent and correct.)

[OPUS-REVIEWED] 7d2a23d

Verdict parsed from the review's SHA-scoped output markers for commit 7d2a23dde0c8c9d9de448be354292f0041c22f6e.

False positive or not applicable? A repository writer can comment:
/ai-review override fable 7d2a23dde0c8c9d9de448be354292f0041c22f6e: <one-sentence reason>

github-actions · 2026-08-10T10:10:58Z

GPT 5.6 Review — ✅ no blocking findings

GPT 5.6 completed its review of 7d2a23dde0c8c9d9de448be354292f0041c22f6e and found no blocking issues.

This comment is updated in place on each push.

Review details

FINDING -- website/src/components/DiffBlock.tsx:158 -- An uncorroborated +++ b/home/... makes "ambiguousRootless ? corroboratedRooted" null, so the captured flow still has no Open affordance -> Fix: probe both spellings and accept only a unique success.
[GPT-REVIEWED] 7d2a23d

False positive or not applicable? A repository writer can comment:
/ai-review override gpt 7d2a23dde0c8c9d9de448be354292f0041c22f6e: <one-sentence reason>

github-actions · 2026-08-10T10:11:53Z

Design Review (Fable 5) — 🟡 CONCERNS

Advisory design-level review of 7d2a23dde0c8c9d9de448be354292f0041c22f6e — updated in place on each push; does not block merge.

Design-Verdict: CONCERNS

Shipped design differs from the described one: the PR text promises dual-spelling probing with "exactly one exists" arbitration; the code ships pathHint-corroboration-only.

Watch

Description ↔ diff mismatch: the description says DiffBlock "probes both spellings concurrently. The Open affordance appears only when exactly one exists," and lists "both-exist suppression" tests — but the code never probes the relative spelling of an ambiguous header (probePath = ambiguousRootless ? corroboratedRooted : headerPath), and no both-exist test exists. The comment even states probing "cannot arbitrate the ambiguity." The shipped corroboration-only design is arguably safer, but a human approving on the description approves a different mechanism than the one merged. Update the description to match.
ROOTLESS_ABS_RE = /^(home|Users|tmp|var|opt|workplace)\// is an enumerated-roots heuristic: a git diff --no-index /srv/x (or /etc, /mnt, /private on macOS) header still strips to a rootless path, misses the allowlist, and re-emits the exact resolve=1 400 this PR exists to stop. Acceptable residue for the observed cases, but it's the part of this fix that will quietly regress — worth a comment or follow-up noting the list is intentionally partial.

[DESIGN-REVIEWED] 7d2a23d

git joins its a/ b/ prefix onto absolute paths, collapsing the leading slash: 'git diff --no-index /tmp/x /tmp/y' emits '+++ b/tmp/y'. DiffBlock's extractFilePath stripped the prefix and probed the rootless remainder as a relative path — the captured 'GET /api/file-read?path=home/<user>/…&resolve=1' → 400 from the issue. extractFilePath now reports whether a git prefix was stripped. A stripped header whose remainder starts with a conventional filesystem root (home/Users/tmp/var/opt/workplace) is treated as AMBIGUOUS and resolved by outside corroboration only: when the surrounding chat text independently names the rooted spelling (pathHint), that spelling is probed instead; without corroboration the header gets no probe (eliminating the captured 400 request itself) and no Open affordance — existence probing cannot arbitrate the ambiguity because with no project dir configured the backend rejects every relative path, so absence is not evidence, and a wrong guess points an editor a save can write through at an unrelated host file. The confirmed path is keyed to the header it was measured for, so a mid-stream header change can never leave the button targeting a stale path. Genuine repo-relative and plain prefix-less headers are unchanged. Backend validation untouched. Closes #2493

bolichen97 · 2026-08-10T10:25:27Z

🤖 Kiro Crew Auto-Pipeline [operator: bolichen97]

GPT 5.6 blocking finding on 607d8e3 — fixed in 7d2a23d, verdict accepted.

The finding was correct: probing the relative spelling is not trustworthy evidence of absence (with no project dir configured the backend 400s every relative path), so the exactly-one-exists rule could still crown the unrelated absolute file. Adopted the suggested remedy in its strict form: an ambiguous rootless header (prefixStripped + /^(home|Users|tmp|var|opt|workplace)\//) is now resolved by pathHint corroboration only — when the surrounding chat text independently names the rooted spelling, that spelling alone is probed; without corroboration the header gets no probe at all (which also eliminates the captured 400 request itself) and no Open affordance. Tests updated: uncorroborated-suppression (asserts zero fetches), corroborated-open, non-matching-hint-suppression, missing-file, plus the unchanged relative/prefix-less paths. Screenshot evidence added to the PR body.

…ev#2493) (kirodotdev#2517) git joins its a/ b/ prefix onto absolute paths, collapsing the leading slash: 'git diff --no-index /tmp/x /tmp/y' emits '+++ b/tmp/y'. DiffBlock's extractFilePath stripped the prefix and probed the rootless remainder as a relative path — the captured 'GET /api/file-read?path=home/<user>/…&resolve=1' → 400 from the issue. extractFilePath now reports whether a git prefix was stripped. A stripped header whose remainder starts with a conventional filesystem root (home/Users/tmp/var/opt/workplace) is treated as AMBIGUOUS and resolved by outside corroboration only: when the surrounding chat text independently names the rooted spelling (pathHint), that spelling is probed instead; without corroboration the header gets no probe (eliminating the captured 400 request itself) and no Open affordance — existence probing cannot arbitrate the ambiguity because with no project dir configured the backend rejects every relative path, so absence is not evidence, and a wrong guess points an editor a save can write through at an unrelated host file. The confirmed path is keyed to the header it was measured for, so a mid-stream header change can never leave the button targeting a stale path. Genuine repo-relative and plain prefix-less headers are unchanged. Backend validation untouched. Closes kirodotdev#2493

bolichen97 requested a review from a team August 10, 2026 10:06

bolichen97 requested a review from a team as a code owner August 10, 2026 10:06

github-actions Bot added the readiness: checking Automated validation is still running label Aug 10, 2026

bolichen97 mentioned this pull request Aug 10, 2026

Dashboard file-read request drops leading slash from path param, backend returns 400 #2493

Closed

github-actions Bot added readiness: action required A blocking check or review needs attention and removed readiness: checking Automated validation is still running labels Aug 10, 2026

bolichen97 force-pushed the fix/file-read-absolute-path-2493 branch from 607d8e3 to 7d2a23d Compare August 10, 2026 10:24

github-actions Bot added readiness: checking Automated validation is still running and removed readiness: action required A blocking check or review needs attention labels Aug 10, 2026

kyleseaman enabled auto-merge (squash) August 10, 2026 12:15

kyleseaman approved these changes Aug 10, 2026

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kyleseaman merged commit 79584b4 into main Aug 10, 2026
84 of 88 checks passed

kyleseaman deleted the fix/file-read-absolute-path-2493 branch August 10, 2026 12:15

github-actions Bot removed the readiness: passed Eligible automated validation passed for the current revision label Aug 10, 2026

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fix: restore leading slash on git-mangled diff header paths (#2493) - #2517

fix: restore leading slash on git-mangled diff header paths (#2493)#2517
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fix/file-read-absolute-path-2493

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Summary

Fix (frontend only — backend validation untouched)

Ruled out (all eleven fileReadUrl callers traced)

Tested

Screenshots

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UX Review (Fable 5) — ✅ PASS

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Opus 4.8 Review — ✅ no blocking findings

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GPT 5.6 Review — ✅ no blocking findings

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Design Review (Fable 5) — 🟡 CONCERNS

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