ci: consolidate Dylint to one Linux gate

.github/workflows/_lint.yml

@@ -10,6 +10,10 @@ on:
       runs-on:
         required: true
         type: string
+      run-dylint:
+        required: false
+        type: boolean
+        default: false
 
 jobs:
   lint:
@@ -77,7 +81,7 @@ jobs:
           # Native dylint caching: caches cargo-dylint/dylint-link binaries and
           # the dylint driver dir, exposing dylint-cache-hit so we can skip the
           # expensive cargo installs below (#170).
-          dylint-cache: true
+          dylint-cache: ${{ inputs.run-dylint }}
           dylint-toolchain: nightly-2026-05-28
           cargo-dylint-version: "6.0.3"
           dylint-link-version: "6.0.3"
@@ -86,10 +90,15 @@ jobs:
         run: uv sync --group dev
 
       - name: Prepare published Dylint tools
+        if: inputs.run-dylint
         run: env -u RUSTUP_TOOLCHAIN soldr dylint prepare
 
-      - name: Lint
+      - name: Lint with Dylint
+        if: inputs.run-dylint
         run: ./lint
+      - name: Lint without Dylint
+        if: ${{ !inputs.run-dylint }}
+        run: ./lint --skip-dylint
 
       - name: Upload failure logs
         if: failure()

.github/workflows/linux-x86-lint.yml

@@ -24,3 +24,4 @@ jobs:
     with:
       source-sha: ${{ github.event_name == 'workflow_dispatch' && inputs.candidate_sha || github.event_name == 'pull_request' && github.event.pull_request.head.sha || github.sha }}
       runs-on: ubuntu-24.04
+      run-dylint: true

lint

@@ -3,6 +3,12 @@ set -e
 
 SCRIPT_DIR="$(cd -- "$(dirname -- "${BASH_SOURCE[0]}")" && pwd)"
 
+if [[ $# -gt 1 || ($# -eq 1 && "$1" != "--skip-dylint") ]]; then
+  echo "Usage: ./lint [--skip-dylint]" >&2
+  exit 2
+fi
+SKIP_DYLINT=${1:-}
+
 LINT_PATHS=(src tests ci)
 
 # Python stages run first: they need no Rust toolchain, so a host without
@@ -29,13 +35,15 @@ soldr cargo fmt --all --check
 echo Running cargo clippy
 soldr cargo clippy --workspace --all-targets -- -D warnings
 
-echo Running ban_std_pathbuf dylint
-export SOLDR_FORCE_MANAGED_CARGO_SUBCOMMANDS=1
-if ! env -u RUSTUP_TOOLCHAIN soldr dylint prepare; then
-  echo "Error: dylint prerequisites are missing: soldr dylint prepare failed" >&2
-  exit 1
+if [[ "$SKIP_DYLINT" != "--skip-dylint" ]]; then
+  echo Running ban_std_pathbuf dylint
+  export SOLDR_FORCE_MANAGED_CARGO_SUBCOMMANDS=1
+  if ! env -u RUSTUP_TOOLCHAIN soldr dylint prepare; then
+    echo "Error: dylint prerequisites are missing: soldr dylint prepare failed" >&2
+    exit 1
+  fi
+  env -u RUSTUP_TOOLCHAIN soldr dylint --all -- --workspace --all-targets
 fi
-env -u RUSTUP_TOOLCHAIN soldr dylint --all -- --workspace --all-targets
 
 echo Linting complete!
 exit 0

tests/unit/test_lint_script.py

@@ -29,7 +29,7 @@ def _path_entry_has_dylint_or_rustup(entry: str) -> bool:
 
 
 def _run_lint(
-    tmp_path: Path, *, ci: bool
+    tmp_path: Path, *, ci: bool, args: tuple[str, ...] = ()
 ) -> tuple[subprocess.CompletedProcess[str], list[str]]:
     bin_dir = tmp_path / "bin"
     bin_dir.mkdir()
@@ -58,7 +58,7 @@ def _run_lint(
         env.pop("CI", None)
 
     result = subprocess.run(
-        ["bash", str(REPO_ROOT / "lint")],
+        ["bash", str(REPO_ROOT / "lint"), *args],
         cwd=REPO_ROOT,
         env=env,
         capture_output=True,
@@ -120,6 +120,13 @@ def test_missing_dylint_is_a_hard_failure_in_ci(tmp_path: Path) -> None:
     assert _log_has_match(log_lines, r"^uv (run )?pyright src tests ci$")
 
 
+def test_explicit_skip_keeps_other_lints_but_does_not_run_dylint(tmp_path: Path) -> None:
+    result, log_lines = _run_lint(tmp_path, ci=True, args=("--skip-dylint",))
+    assert result.returncode == 0
+    assert any(line.startswith("soldr cargo clippy") for line in log_lines)
+    assert not any("dylint" in line for line in log_lines)
+
+
 def test_python_stages_precede_the_rust_stages(tmp_path: Path) -> None:
     _result, log_lines = _run_lint(tmp_path, ci=False)
 
@@ -144,10 +151,18 @@ def test_python_stages_precede_the_rust_stages(tmp_path: Path) -> None:
         "windows-x86-lint.yml",
     ],
 )
-def test_native_dylint_runs_on_unlabelled_pr(workflow: str) -> None:
+def test_native_lint_without_dylint_runs_on_unlabelled_pr(workflow: str) -> None:
     source = (REPO_ROOT / ".github" / "workflows" / workflow).read_text(
         encoding="utf-8"
     )
     assert "pull_request:" in source
     assert "uses: ./.github/workflows/_lint.yml" in source
+    assert "run-dylint: true" not in source
     assert "contains(github.event.pull_request.labels.*.name, 'ci-full')" not in source
+
+
+def test_only_linux_x86_runs_unified_dylint() -> None:
+    source = (REPO_ROOT / ".github" / "workflows" / "linux-x86-lint.yml").read_text(
+        encoding="utf-8"
+    )
+    assert "run-dylint: true" in source