Add Python Code Style Enforcement to GitHub Actions

.github/workflows/python-style.yml

@@ -0,0 +1,29 @@
+name: Python Style
+
+on:
+  pull_request:
+    paths:
+    # Only trigger on core script changes
+    - 'scripts/**.py'
+
+jobs:
+  enforce:
+    runs-on: ubuntu-latest
+    steps:
+    - name: Checkout code
+      uses: actions/checkout@v4
+    - name: Set up Python 3.x Part 1
+      uses: actions/setup-python@v4
+      with:
+        python-version: "3.9"
+    - name: Install style tooling
+      working-directory: scripts
+      run: make venv.codestyle
+    - name: Run formatter
+      working-directory: scripts
+      run: make ci.format
+      # Temporarily auto-pass linting until we are able to manually review and
+      # address.
+    - name: Run linter
+      working-directory: scripts
+      run: make lint || true

.gitignore

@@ -4,3 +4,34 @@ __pycache__
 sanity-check.py
 .cr-release-packages/*.tgz
 oc
+
+# Byte-compiled / optimized / DLL files
+__pycache__/
+*.py[cod]
+*$py.class
+
+# C extensions
+*.so
+
+# Distribution / packaging
+.Python
+build/
+develop-eggs/
+dist/
+downloads/
+eggs/
+.eggs/
+lib/
+lib64/
+parts/
+sdist/
+var/
+wheels/
+share/python-wheels/
+*.egg-info/
+.installed.cfg
+*.egg
+MANIFEST
+
+# Virtual Envs
+venv.*/

scripts/Makefile

@@ -0,0 +1,56 @@
+PY_BIN ?= python3
+
+# The virtualenv containing code style tools.
+VENV_CODESTYLE = venv.codestyle
+VENV_CODESTYLE_BIN = $(VENV_CODESTYLE)/bin
+
+# The virtualenv containing our CI scripts
+VENV_TOOLS = venv.tools
+VENV_TOOLS_BIN = $(VENV_TOOLS)/bin
+
+# This is what we pass to git ls-files.
+LS_FILES_INPUT_STR ?= 'src/*.py'
+
+.PHONY: default
+default: format lint
+
+# The same as format, but will throw a non-zero exit code
+# if the formatter had to make changes.
+.PHONY: ci.format
+ci.format: format
+	git diff --exit-code
+
+venv.codestyle:
+	$(MAKE) venv.codestyle.always-reinstall
+
+# This target will always install the codestyle venv.
+# Useful for development cases.
+.PHONY: venv.codestyle.always-reinstall
+venv.codestyle.always-reinstall:
+	$(PY_BIN) -m venv $(VENV_CODESTYLE)
+	./$(VENV_CODESTYLE_BIN)/pip install --upgrade \
+		black \
+		ruff
+
+.PHONY: format
+format: venv.codestyle
+	./$(VENV_CODESTYLE_BIN)/black \
+		--verbose \
+		$$(git ls-files $(LS_FILES_INPUT_STR))
+
+.PHONY: lint
+lint: venv.codestyle
+	./$(VENV_CODESTYLE_BIN)/ruff \
+		check \
+		$$(git ls-files $(LS_FILES_INPUT_STR))
+
+venv.tools:
+	$(MAKE) venv.tools.always-reinstall
+
+# This target will always install the tools at the venv.
+# Useful for development cases.
+.PHONY: venv.tools.always-reinstall
+venv.tools.always-reinstall:
+	$(PY_BIN) -m venv $(VENV_TOOLS)
+	./$(VENV_TOOLS_BIN)/pip install -r requirements.txt
+	./$(VENV_TOOLS_BIN)/python setup.py install

scripts/ruff.toml

@@ -0,0 +1,4 @@
+ignore = [
+    "E402", # import ordering (komish): import ordering isn't handled by Black so we need to handle this manually.
+    "E501", # line length (komish): line length is not enforced by Black so we need to handle these manually.
+]