[GitHub][CI] Add pip cache and enable hard failure in lint-helper.py

Author: vbvictor

.github/workflows/pr-code-lint.yml

@@ -57,21 +57,27 @@ jobs:
             clang-tools-extra/clang-tidy/tool/clang-tidy-diff.py
           sparse-checkout-cone-mode: false
           path: code-lint-tools
-      
-      - name: Install python
-        uses: actions/setup-python@a26af69be951a213d495a4c3e4e4022e16d87065 # v5.6.0
-        with:
-          python-version: '3.12'
 
-      - name: Install python dependencies
-        run: python3 -m pip install -r code-lint-tools/llvm/utils/git/requirements_linting.txt
-      
       - name: Install clang-tidy
         uses: aminya/setup-cpp@17c11551771948abc5752bbf3183482567c7caf0 # v1.1.1
         with:
           clang-tidy: 20.1.8
+
+      - name: Clear Python cache
+        run: sudo rm -rf /__t/Python
+      
+      - name: Setup Python env
+        uses: actions/setup-python@42375524e23c412d93fb67b49958b491fce71c38 # v5.4.0
+        with:
+          python-version: '3.12'
+          cache: 'pip'
+          cache-dependency-path: 'code-lint-tools/llvm/utils/git/requirements_linting.txt'
+
+      - name: Install Python dependencies
+        run: pip install -r code-lint-tools/llvm/utils/git/requirements_linting.txt
 
-      # FIXME: create special mapping for 'gen' targets, for now build predefined set
+      # TODO: create special mapping for 'codegen' targets, for now build predefined set
+      # TODO: add entrypoint in 'compute_projects.py' that only adds a project and its direct dependencies
       - name: Configure and CodeGen
         run: |
           git config --global --add safe.directory '*'

llvm/utils/git/code-lint-helper.py

@@ -20,6 +20,7 @@
 import argparse
 import os
 import subprocess
+import sys
 from typing import List, Optional
 
 
@@ -325,5 +326,4 @@ def run_linter(changed_files: List[str], args: LintArgs) -> tuple[bool, Optional
 
     if not success:
         print("error: some linters failed: clang-tidy")
-        # Do not fail job for as it may be unstable
-        # sys.exit(1)
+        sys.exit(1)