add cmk.werks.validate module

this can be used via master daily docker image, to check if werks will
be valid with master branch loading/parsing logic. It has to be tested
in master daily docker image as this is the code used to build werk db
for homepage and send mails to mailinglists.

CMK-15097

Change-Id: Ibae96a5d8635d7c46804d04e87a81836fa99f6a3

packages/cmk-werks/cmk/werks/validate.py

@@ -0,0 +1,33 @@
+#!/usr/bin/env python3
+# Copyright (C) 2023 Checkmk GmbH - License: GNU General Public License v2
+# This file is part of Checkmk (https://checkmk.com). It is subject to the terms and
+# conditions defined in the file COPYING, which is part of this source code package.
+
+# used as validator for 2.2.0 and 2.1.0 branches
+
+import os
+from pathlib import Path
+
+from . import load_werk
+
+
+def main() -> None:
+    if changed_werk_files := os.environ.get("CHANGED_WERK_FILES"):
+        werks_to_check = (Path(line) for line in changed_werk_files.split("\n") if line)
+    else:
+        werks_to_check = (
+            path
+            for path in Path(".werks").iterdir()
+            if path.name.isdigit() or path.name.endswith(".md")
+        )
+
+    for werk_path in werks_to_check:
+        werk_content = werk_path.read_text(encoding="utf-8")
+        try:
+            load_werk(file_content=werk_content, file_name=werk_path.name)
+        except Exception as e:
+            raise RuntimeError(f"Error while loading werk {werk_path}\n{werk_content}") from e
+
+
+if __name__ == "__main__":
+    main()