Add lint scripts to scripts/ and update CI to use them

- Add scripts/cpplint.py for C++ style checking
- Add scripts/check_license.sh for license header verification
- Update workflow to use scripts from repo instead of image
- Update lint image tag to 2026-01-05-90f182d5d748

Signed-off-by: cdunning <cdunning@nvidia.com>

Author: camille-004

.github/workflows/ci.yml

@@ -21,7 +21,7 @@ jobs:
     runs-on: ubuntu-latest
     timeout-minutes: 10
     container:
-      image: ghcr.io/nvidia/cutile-python/lint:2025-12-06-4cb7d16e4c20
+      image: ghcr.io/nvidia/cutile-python/lint:2026-01-05-90f182d5d748
     steps:
       - name: Checkout repository
         uses: actions/checkout@v6
@@ -30,10 +30,10 @@ jobs:
         run: flake8
 
       - name: Run cpplint
-        run: python3 ci/cpplint.py
+        run: python scripts/cpplint.py
 
       - name: Check license headers (REUSE)
-        run: ci/scripts/check_license.sh
+        run: scripts/check_license.sh
 
       - name: Check inline samples are up to date
-        run: python3 test/tools/inline_samples.py --check
+        run: python test/tools/inline_samples.py --check

scripts/check_license.sh

@@ -0,0 +1,12 @@
+#!/bin/bash
+# SPDX-FileCopyrightText: Copyright (c) <2025> NVIDIA CORPORATION & AFFILIATES. All rights reserved.
+#
+# SPDX-License-Identifier: Apache-2.0
+
+ignore_files=("src/cuda/tile/VERSION")
+outputs=$(reuse lint --lines | grep -v ${ignore_files[@]/#/-e })
+if [ -n "$outputs" ]; then
+  echo -e "License check failed\n${outputs}"
+  exit 1
+fi
+

scripts/cpplint.py

@@ -0,0 +1,77 @@
+#!/usr/bin/env python3
+# SPDX-FileCopyrightText: Copyright (c) <2025> NVIDIA CORPORATION & AFFILIATES. All rights reserved.
+#
+# SPDX-License-Identifier: Apache-2.0
+
+import os
+import sys
+
+file_extensions = [
+    ".h",
+    ".hpp",
+    ".hh",
+    ".c",
+    ".C",
+    ".cpp",
+    ".cxx",
+    ".cc",
+    ".pyx",
+    ".pxd",
+]
+max_line_len = 100
+
+
+def should_lint(filename: str):
+    return any(filename.endswith(x) for x in file_extensions)
+
+
+def lint(paths):
+    num_errors = 0
+    num_files = 0
+
+    def report_error(message: str):
+        nonlocal num_errors
+        print(f"{full_name[len(path) + 1:]}:{i + 1}: {message}", file=sys.stderr)
+        num_errors += 1
+
+    for path in paths:
+        for root, dirs, files in os.walk(path):
+            for filename in files:
+                if not should_lint(filename):
+                    continue
+                full_name = os.path.join(root, filename)
+                with open(full_name, "r") as f:
+                    for i, line in enumerate(f):
+                        if "noqa" in line:
+                            continue
+                        if "SPDX" in line:
+                            continue
+
+                        length = len(line)
+                        if line.endswith("\n"):
+                            length -= 1
+                        if length > max_line_len:
+                            report_error(
+                                f"Line is longer than {max_line_len} characters"
+                            )
+                        if length > 0 and line[length - 1].isspace():
+                            report_error("Trailing whitespace at the end of the line")
+                num_files += 1
+
+    if num_errors > 0:
+        print(f"Found {num_errors} errors", file=sys.stderr)
+        sys.exit(1)
+    elif num_files == 0:
+        print("No input files found!", file=sys.stderr)
+        sys.exit(2)
+    else:
+        print(f"Checked {num_files} files, all OK")
+
+
+if __name__ == "__main__":
+    script_dir = os.path.dirname(__file__)
+    project_root = os.getcwd()
+    dirs = ["cext", "torch_cext", "src"]
+    paths = [os.path.join(project_root, d) for d in dirs]
+    lint(paths)
+