bbdf7e8e84
* chore(#4654): add local/no-unconfined-path-join and drain it to zero Phase 4 of epic #4636 — the ratchet, and the phase that makes the epic hold. THE MEASUREMENT THAT RESHAPED THE PHASE. An AST census (the repo's own parser, not grep) found what the epic never enumerated: ADR-4650 named seven containment implementations; `src/` alone held roughly 24 more hand-rolled gates across ~13 files, several guarding a write or an `fs.rmSync`. Two verified by reading rather than pattern-matching — `research-store.cts` comments its own as "ensure the resolved file path stays inside the store dir" immediately before a write, and `capability-lifecycle.cts` gates `fs.rmSync` with one. So the epic's Done-when "one containment predicate, used at every site" was FALSE when Phase 3 reported it satisfied. It is true now: the rule is clean across src/, scripts/, gsd-core/bin/ and hooks/ with an EMPTY allowlist. WHY NOT THE RULE THE ISSUE PROPOSED. #4654 proposed flagging `path.join` whose first argument is a managed root and whose later arguments derive from argv. That is a taint analysis over 2046 call sites, in ESLint, without type information; "derives from argv" is not locally decidable. Any approximation either floods or is trivially evaded, and a rule that fires on hundreds of correct sites earns an allowlist of hundreds — the opposite of a ratchet. What is actually duplicated is the COMPARISON, not the join, and that has one recognizable shape. Arm 1 X.startsWith(Y + sep) the hand-rolled containment idiom Arm 2 a containment predicate called as a bare statement, answer discarded Arm 2 is the issue's "asserts the result was narrowed, not merely that a helper was called". Its example `validatePath(x, root).resolved` is already structurally impossible — Phase 3 un-exported `validatePath` — so the remaining expressible failure is ignoring the answer, which is the defect that recurred five times in this epic. The census found exactly one live instance (`milestone.cts:1643`); it now returns the proven `ContainedPath` so consumers stop re-deriving the path the comment above it was extracted to stop them re-deriving. The rule deliberately does NOT try to catch validate-one-path-use-another where the answer is used but a different variable flows onward. That needs flow analysis; the branded `ContainedPath` from Phase 3 is the defense there, and the two are complementary. PER-SITE FAMILY CHOICE, NOT A DEFAULT. Phase 3's lesson binds: collapsing a lexical site onto the realpath family broke four tests and was caught only by the matrix. Every migrated site was triaged individually. The six installer-migrations tree-walks and the six capability-lifecycle gates take the LEXICAL family because their operands are already realpath-resolved and they deliberately treat the final component as a link; boundary sites take realpath. TWO SITES WITH AN INVERTED CONTRACT, which a mechanical swap would have broken. `installer-migrations.cts:127` and `runtime-artifact-install-plan.cts:144` REJECT `target === root` by contract, while the canonical comparison ACCEPTS it. Swapped naively, a migration could `rmdir` the user's config root and a third-party descriptor could write at configHome itself. Both keep `=== root` as an explicit additional arm alongside the predicate call — the predicate decides containment, the call site keeps its own extra condition (ADR-4650 decision 6). ONE DUPLICATE DELETED OUTRIGHT: `planning-inspect.cts`'s `isWithinRoot` was byte-identical to `isContainedIn` and said so in its own docstring. `isContainedIn` is now exported for callers that have already resolved both operands and need only the comparison, with a doc note that a caller which has NOT resolved them must use a full predicate instead. THE MARKER, AND WHY IT IS NOT THE ALLOWLIST. Nine sites are justified holdouts and carry `// allow-handrolled-containment: <reason>` with a mandatory, reviewable reason. Two justifications: (a) not a containment decision — an ancestor-walk loop condition, sub-repo grouping, worktree identity matching, declared-path coverage; (b) it IS containment but the canonical predicate is unreachable — `capability-validator.cjs` is a committed pre-build `.cjs` and the compiled `security.cjs` is untracked build output, so requiring it would break a fresh clone. `scripts/lib/drift-scan.cjs` runs under `lint:ci` with the same exposure. The marker was renamed from `allow-lexical-prefix-match` mid-phase because that name asserted only (a) and would have stated something false at the (b) sites. A marker suppresses BEFORE the violation counter increments, so a file whose every occurrence is marked still reports `staleAllowlistEntry` — otherwise a drained entry lingers and silently re-permits the site later. DEMONSTRATED RED, per #4654: a hand-rolled copy reintroduced into a real `src/` file made `npm run lint` fail with the rule's full guidance message; removing it returned the tree to clean. Both halves recorded — red alone proves nothing, since a rule red for an unrelated reason looks identical. DISCLOSED: `defaultRequireFromInstallRoot` (gsd-tools.cjs) previously carried two distinct rejection messages and two manual realpath calls; routing it through `tryWithinRoot` collapses them to one message, and a missing module now surfaces as MODULE_NOT_FOUND rather than ENOENT. No test asserts either message. The security property is preserved and slightly strengthened — the candidate is realpathed and containment re-checked, and the dangling-symlink oracle closure comes along with it. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> * docs(#4654): record the containment ratchet in CONTEXT.md and the security model Both entries previously described the seam without the thing that keeps it a seam. They now state what the rule bans, and — more usefully for whoever reads this next — what it deliberately does NOT attempt: deciding per path.join call whether an argument came from user input. That question is not locally decidable, and an approximation across ~2000 join sites would earn an exemption list of hundreds, which is the opposite of a ratchet. Also records the marker's two legitimate justifications and that its reason is mandatory, so the escape stays reviewable rather than becoming a mute button. Glossary gate 270 refs exit 0; install-tree goldens and CONTEXT-INDEX.json regenerated and confirmed byte-identical rather than assumed — which also confirms eslint-rules/ is not a shipped path. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> * fix(#4654): close review findings and the two matrix failures MATRIX FAILURE 1 — a collapsed message broke a negative-proof test, and my evidence for collapsing it was wrong. I searched tests/ for the literal string "resolves outside its install root", found nothing, and reported that no test asserted it. The test matches a REGEX SUBSTRING, /outside its install root/, so the literal search missed it. What broke was "NEGATIVE PROOF: a symlinked module pointing OUTSIDE the install root is not loaded" — the test guarding the exact property I claimed was preserved. defaultRequireFromInstallRoot now does both checks again with both messages byte-identical, each routed through the canonical predicate, which is better than the original since that hand-rolled both comparisons. MATRIX FAILURE 2 — shipped migrations are checksum-locked, and a marker cannot serve there. migrationChecksum hashes plan.toString(), which INCLUDES comments, so a suppression marker inside a plan body drifts the baseline exactly as an edit does. Measured: with markers in place, two of the four still differed from their committed checksums. The four shipped bodies are now byte-identical to next, and the rule's config excludes those four paths BY NAME rather than by a directory wildcard, so a NEW migration is still covered. Six containment comparisons stay un-ratcheted there; that gap is recorded in the rule's Known gaps, in CONTEXT.md and in the security model rather than left implicit. Justification (c) is removed from the marker's documented reasons, because a marker was proven unable to express it. ADVERSARIAL REVIEW — the sharpest finding was that the rule banned the CORRECT shape while permitting the incorrect one: startsWith(root) with no separator is the genuinely unsafe form, since it accepts a sibling such as root-evil, and my own test blessed it as valid. Flagging every bare startsWith would swamp the rule, so that stays a STATED gap rather than a silent one. Closed for real: the template-literal spelling, which the census never saw because it only inspected plus-concatenation — that surfaced TWELVE more sites, now triaged and migrated. A separator reached through a const alias is now resolved via scope analysis. And isContainedIn, exported in Phase 3, was missing from the discarded-result set, so a bare no-op call went unflagged on the one function the epic funnels through. SECURITY REVIEW — the marker could over-suppress two ways: a block comment worked identically to a line comment, and one marker silently covered every violation sharing its line. It now requires a Line comment positioned after the flagged node ends, so it anchors to the node it trails. Four sites had dropped an unreachable-but-deliberate equality rejection against the root; each is restored as the call site's own arm. eslint.config.mjs still documented the OLD marker token, which my rename missed — it would have sent the next author in circles. A FALSE GREEN, recorded because it nearly stuck: lint:ci reported exit 0 from a stale eslint cache while twelve real violations existed. Every lint check here now clears the cache first. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> * fix(#4654): anchor a suppression marker to the violation it actually trails The matrix caught this; my own test caught it, on its first execution. The case "two violations on one line: trailing marker suppresses only the one it trails" expected 1 error and got 0 — both were suppressed. ROOT CAUSE: the anchoring accepted any Line comment on the node's line whose range started at or after the node's end. A trailing marker at the END of a line sits after EVERY node on that line, so that condition held for all of them. "After the node" does not identify WHICH node the marker trails. The fix reads as correct and is not. FIX: deferred reporting. Violations accumulate during traversal instead of being reported immediately; at Program:exit each marker claims exactly ONE pending violation — the one on its line whose end is nearest before the marker begins — and every unclaimed violation is then counted and reported. One marker, one suppression. An earlier violation sharing the line is still reported, which is the property the security review asked for and the previous attempt only appeared to deliver. The counter now increments at flush time rather than during traversal, so a suppressed occurrence still does not keep an allowlist entry alive. AND A TOOL THAT SHOULD HAVE EXISTED BEFORE THE FIRST MATRIX RUN. `node --test` is hard-blocked here, so this rule's test file could only ever be executed on the remote matrix — which is why a broken anchoring shipped into a run. ESLint's programmatic Linter API is not a test runner, and exercising the rule through it verifies every case locally in seconds. All 24 now pass locally, including the two-on-one-line case that failed remotely. That loop should have been built before the rule was first sent to the matrix rather than after it failed twice. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> * chore(#4654): backfill PR 4674 into the changeset and complete 70-docs.json The phase gate requires enablementSequence and the Diataxis quadrants; 70-docs now carries both, with the how-to quadrant skipped for a stated reason rather than an empty field. The audience for this deliverable is a contributor who trips the rule, and the task-oriented guidance reaches them in the ESLint message itself — which names the correct predicate, says how to choose between the realpath and lexical families, cites the Phase 3 regression caused by choosing wrong, and gives the marker syntax. A docs/how-to page would be a second, driftable copy read by nobody at the moment of failure. enablementSequence is recorded as what it actually is: a VERIFICATION sequence, not an enablement one. The rule is never off, so there is no off-to-on transition to describe. scripts/lint-docs-required.cjs now passes (ok_docs_updated) — it could not evaluate against the mandated pr:0 placeholder. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> --------- Co-authored-by: sim <sim@local> Co-authored-by: Claude Opus 5 <noreply@anthropic.com>
Changeset Fragments
This directory holds per-PR CHANGELOG fragments. Every PR with user-facing changes drops one (or more) <random-name>.md files here describing its CHANGELOG entry. Fragments are consolidated into the top-level CHANGELOG.md at release time.
Why
Two PRs that both edit the ### Fixed block of CHANGELOG.md always conflict on merge — git can't pick a serialization order without human input. Two PRs that each add a fresh .changeset/<unique-name>.md never conflict because they don't share lines.
See #2975 for the full rationale.
Adding a fragment
node scripts/changeset/new.cjs \
--type Fixed \
--pr 1234 \
--body "fix the thing — explain the user-visible change in one sentence"
This writes .changeset/<adjective>-<noun>-<noun>.md with frontmatter and a body. Three random words → concurrent PRs don't collide.
Format
---
type: Fixed
pr: 1234
---
**`/gsd-foo` no longer drops trailing slashes** — explain the user-visible change.
Allowed type: values follow Keep a Changelog: Added, Changed, Deprecated, Removed, Fixed, Security.
Opting out
PRs that legitimately have no user-facing impact can add the no-changelog label. CI honors it. When unsure, add the fragment.
At release time
Promotion is automatic. The release workflow's finalize job runs:
node scripts/changeset/cli.cjs render --version vX.Y.Z --date YYYY-MM-DD --allow-empty
This reads every fragment, groups bullets by type:, replaces ## [Unreleased] with a new ## [vX.Y.Z] - YYYY-MM-DD block, opens a fresh ## [Unreleased] above, and deletes consumed fragments. The --allow-empty flag ensures a no-change release still gets a dated heading (with a _No notable changes._ placeholder). A subsequent verify step confirms the promotion landed correctly. Maintainers do not run this by hand.
Archived fragments
.changeset/archived/ holds fragments for already-shipped releases (≤ 1.3.1), retained for provenance. Their content was hand-curated into the dated ## [1.x.y] sections of CHANGELOG.md during the #690 backfill — they were never consumed by render. All changeset tooling enumerates .changeset/ non-recursively, so archived fragments are never picked up or rendered. Do not move them back to the top level.