Add CODEOWNERS mechanism (#1199)

script/build_codeowners.py

@@ -0,0 +1,68 @@
+#!/usr/bin/env python3
+from pathlib import Path
+import sys
+import argparse
+
+from esphome.helpers import write_file_if_changed
+from esphome.config import get_component
+from esphome.core import CORE
+
+parser = argparse.ArgumentParser()
+parser.add_argument('--check', help="Check if the CODEOWNERS file is up to date.",
+                    action='store_true')
+args = parser.parse_args()
+
+# The root directory of the repo
+root = Path(__file__).parent.parent
+components_dir = root / 'esphome' / 'components'
+
+BASE = """
+# This file is generated by script/build_codeowners.py
+# People marked here will be automatically requested for a review
+# when the code that they own is touched.
+#
+# Every time an issue is created with a label corresponding to an integration,
+# the integration's code owner is automatically notified.
+
+# Core Code
+setup.py @esphome/core
+esphome/*.py @esphome/core
+esphome/core/* @esphome/core
+
+# Integrations
+""".strip()
+
+parts = [BASE]
+
+# Fake some diretory so that get_component works
+CORE.config_path = str(root)
+
+for path in sorted(components_dir.iterdir()):
+    if not path.is_dir():
+        continue
+    if not (path / '__init__.py').is_file():
+        continue
+    name = path.name
+    comp = get_component(name)
+    if comp.codeowners:
+        for owner in comp.codeowners:
+            if not owner.startswith('@'):
+                print(f"Codeowner {owner} for integration {name} must start with an '@' symbol!")
+                sys.exit(1)
+
+        parts.append(f"esphome/components/{name}/* {' '.join(comp.codeowners)}")
+
+# End newline
+parts.append('')
+content = '\n'.join(parts)
+codeowners_file = root / 'CODEOWNERS'
+
+if args.check:
+    if codeowners_file.read_text() != content:
+        print("CODEOWNERS file is not up to date.")
+        print("Please run `script/build_codeowners.py`")
+        sys.exit(1)
+    print("CODEOWNERS file is up to date")
+else:
+    write_file_if_changed(codeowners_file, content)
+    print("Wrote CODEOWNERS")