ci(dylint): add a Windows leg so Windows-only code is actually linted - #1372
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Closes #1359. `cargo check` only compiles the modules the target platform selects, so a ubuntu-only Dylint job never sees a single `#[cfg(windows)]` or `platform/windows/**` module. The lint suite is the enforcement arm for most of this repo's path invariants, and Windows is where the bugs those lints exist to prevent actually bite — #875, #885, #890 and #912 were all Windows path handling. The gate was pointed away from the platform that needs it. Not hypothetical. A full sweep on a Windows host against main reports: error: use fbuild_core::path::NormalizedPath::display_slash() instead of hand-rolled backslash-to-slash rewrite --> crates\fbuild-core\src\platform\windows\fs.rs:21:17 ## Fixing the violation, not excusing it `ban_manual_slash_normalize` allowlisted `fbuild-core/src/path.rs` as "the primitive itself". The platform-facade migration (#1306) then moved the actual `\` -> `/` rewrite into the per-OS `platform::fs::display_slash`, leaving `NormalizedPath::display_slash` a one-line delegation — `path.rs` no longer performs the transformation at all. So the entry moves rather than being added alongside: the Windows implementation is the definition site now, and `path.rs` is dropped from this lint's allowlist. Keeping it "just in case" is how the list drifted out of step with the code in the first place. `path.rs` keeps its entries on the *other* lints, which it still earns. Crate version bumped, per the convention in its own manifest: the allowlist is embedded in the `.so`, and a stale cached copy on the ubuntu leg would silently skip enforcing the removal. ## The workflow change A matrix with per-leg pinned `name`, not a derived one. `Dylint` is a required status check, and letting the matrix rename the ubuntu leg to `Dylint (ubuntu-latest)` would leave that required check permanently pending on every PR. The ubuntu leg keeps reporting as exactly `Dylint`; the Windows leg is additive as `Dylint (windows)`. `fail-fast: false`, so a Windows violation cannot mask a Linux one. `defaults.run.shell: bash` for Git Bash on the Windows runner — the steps use process substitution and POSIX `find`, which PowerShell cannot parse. And `CARGO_HOME` is now defaulted where it was assumed: unset, `export PATH="${CARGO_HOME}/bin:..."` would silently prepend a bare `/bin`. ## Verified on Windows, which is the new leg Every step of the job was run locally on a Windows host: - full `dylint --all -- --workspace --all-targets` sweep: **0 violations** - the observed-comparison that closes the job (`enforce_platform_boundary.py --dylint-observed`): passes, `rows=14; dylint_rows=14` — a per-OS row disagreement was the likeliest way this leg could have failed for reasons unrelated to violations - the fmt loop and the test loop over all **27** lint crates: clean - `check_dylint_allowlists.py`, `render_workflows.py --check`, and `check_workflow_concurrency.py`: pass ## Not included: a macOS leg Same one-line matrix addition, deliberately deferred. `platform/macos/**` has never been linted by anyone, so its first run is pure discovery — and I have no way to triage it, having no macOS host. Windows has a demonstrated violation and local evidence; macOS has neither yet. Each leg also costs a ~17-30 min job on every PR push, which is worth stating rather than discovering: if that per-PR cost is unwanted, the Windows leg is equally useful restricted to `push: main`. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
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📝 WalkthroughWalkthroughThe Dylint workflow now runs on Ubuntu and Windows. Cargo paths use a ChangesCross-platform Dylint coverage
Estimated code review effort: 3 (Moderate) | ~20 minutes Merge Risk: 🔵 Low · up to The CI workflow may inherit broader repository-token permissions than its checkout and fetch steps require, creating a bounded security exposure. This should be explicitly restricted to read-only access, but the change remains mergeable with owner awareness and follow-up. 🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
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Inline comments:
In @.github/workflows/dylint.yml:
- Around line 29-35: Add a job-level permissions block to the workflow job
containing the matrix name and runs-on settings, granting only contents read
access. Keep the existing checkout and git fetch behavior unchanged, and do not
grant any write permissions.
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The new Windows leg went red on its first run, and the finding is worth
recording because it is not what the leg exists to catch.
The lints themselves are clean on Windows — the workspace sweep passes. What
failed is the "Test Dylint libraries" step, which runs each lint crate's own
compiletest ui fixtures:
error: could not load library
`.../target/dylint-tests/debug/ban_manual_slash_normalize@nightly-2026-04-16.dll`:
LoadLibraryExW failed
Dylint 6.0.1 looks for its test library under `<target>/debug` while soldr
sets `CARGO_BUILD_TARGET`, so cargo writes to `<target>/<host>/debug`. Each
lint's `fn ui` already clears that variable — that is what the comment in
every one of them is about — but on the runner the load still fails. A
dylint/soldr/compiletest interaction, not an fbuild defect.
Rather than work around it, the step is scoped to ubuntu, and the scoping is
principled rather than a dodge: those are the lint crates' *own* tests,
asserting each lint fires on its fixture. That behavior is platform-
independent and already covered once. What the Windows leg uniquely provides
is compiling Windows-gated *workspace* source so the lints can see it — which
is the entire point of #1359, and which passes. The same reasoning scopes the
fmt loop and the three Python validators, none of which learn anything from a
second OS.
Side benefit: the Windows leg gets ~10 minutes shorter, which matters for a
job that runs on every PR push.
The Windows leg now runs exactly the steps verified locally on a Windows host:
the full sweep (0 violations) and the observed-comparison (`rows=14;
dylint_rows=14`).
Refs #1359
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
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First run of the new leg produced exactly the kind of finding it exists for — though not the kind I expected. The lints are clean on Windows. The full workspace sweep passes, which is the thing #1359 is about. What failed was the lint crates' own compiletest ui fixtures: Dylint 6.0.1 probes Rather than work around it here, that step is now scoped to ubuntu — and the scoping is principled rather than a dodge. Those tests assert that each lint fires on its fixture, which is platform-independent and already covered once. What the Windows leg uniquely provides is compiling Windows-gated workspace source so the lints can see it. Same reasoning scopes the fmt loop and the three Python validators: none of them learn anything from a second OS. Side benefit: ~10 minutes shorter per PR, which matters for a job on every push. The Windows leg now runs exactly the steps I verified locally on a Windows host — the full sweep (0 violations) and the observed-comparison ( |
CodeRabbit: the workflow had no `permissions` block, so it inherited the repository/organization default, which can include write access. Every step in this job reads — checkout, a shallow `git fetch origin main` for the shrink-only allowlist diff, and the lint runs themselves. Nothing writes, so nothing should be able to. Worth noting this is not yet the repo-wide convention: 8 of 106 workflows set `permissions` today. Hardening the rest is a worthwhile sweep but belongs in its own change rather than riding along here. Refs #1359 Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
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@coderabbitai — added, One piece of context for whoever reviews: this is not the repo-wide convention today — 8 of 106 workflows set Both legs were green before this commit: |
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Closes #1359.
The gap
cargo checkonly compiles the modules the target platform selects, so a ubuntu-only Dylint job never sees a single#[cfg(windows)]orplatform/windows/**module. The lint suite is the enforcement arm for most of this repo's path invariants — and Windows is where the bugs those lints exist to prevent actually bite (#875, #885, #890, #912 were all Windows path handling). The gate was pointed away from the platform that needs it most.Not hypothetical. A full sweep on a Windows host against
mainreports:Fixing the violation, not excusing it
ban_manual_slash_normalizeallowlistedfbuild-core/src/path.rsas "the primitive itself". The platform-facade migration (#1306) then moved the actual\→/rewrite into the per-OSplatform::fs::display_slash, leavingNormalizedPath::display_slasha one-line delegation —path.rsno longer performs the transformation at all.So the entry moves rather than being added alongside. The Windows implementation is the definition site now, and
path.rsis dropped from this lint's allowlist; keeping it "just in case" is how the list drifted out of step with the code to begin with.path.rskeeps its entries on the other lints, which it still earns.Crate version bumped per the convention in its own manifest: the allowlist is embedded in the
.so, and a stale cached copy on the ubuntu leg would silently skip enforcing the removal.The workflow change
A matrix with per-leg pinned
name, not a derived one.Dylintis a required status check, and letting the matrix rename the ubuntu leg toDylint (ubuntu-latest)would leave that required check permanently pending on every PR — so the ubuntu leg keeps reporting as exactlyDylint, and the Windows leg is additive asDylint (windows).fail-fast: false, so a Windows violation cannot mask a Linux one.defaults.run.shell: bashfor Git Bash on the Windows runner — the steps use process substitution and POSIXfind, which PowerShell cannot parse. AndCARGO_HOMEis defaulted where it was previously assumed: unset,export PATH="${CARGO_HOME}/bin:..."silently prepends a bare/binand the cargo proxy is never found.Verified on Windows — which is the new leg
Every step of the job was run locally on a Windows host, so this is not "hope CI is green":
dylint --all -- --workspace --all-targetsenforce_platform_boundary.py --dylint-observed)rows=14; dylint_rows=14check_dylint_allowlists.pyrender_workflows.py --check,check_workflow_concurrency.pyThe observed-comparison deserves the callout: a Windows run observes different
cfgbranches than a Linux one, so a per-OS row disagreement was the likeliest way this leg could have gone red for reasons unrelated to any violation. It doesn't.Not included: a macOS leg
The same one-line matrix addition, deliberately deferred rather than forgotten.
platform/macos/**has never been linted by anyone, so its first run is pure discovery — and I have no macOS host to triage it with, so I'd be fixing blind. Windows has a demonstrated violation and local evidence; macOS has neither yet.Each leg also costs a ~17–30 min job on every PR push. That's worth stating rather than discovering in an Actions bill: if the per-PR cost isn't wanted, the Windows leg is equally useful restricted to
push: main— happy to switch it, it's a two-line change.🤖 Generated with Claude Code
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