Tools/validate_yaml: add schema validation for module yaml config files

Tools/validate_yaml.py

@@ -0,0 +1,65 @@
+#! /usr/bin/env python
+""" Script to validate YAML file(s) against a YAML schema file """
+
+from __future__ import print_function
+
+import argparse
+import os
+import sys
+
+try:
+    import yaml
+except:
+    print("Failed to import yaml.")
+    print("You may need to install it with 'sudo pip install pyyaml'")
+    print("")
+    raise
+
+try:
+    import cerberus
+except:
+    print("Failed to import cerberus.")
+    print("You may need to install it with 'sudo pip install cerberus'")
+    print("")
+    raise
+
+
+parser = argparse.ArgumentParser(description='Validate YAML file(s) against a schema')
+
+parser.add_argument('yaml_file', nargs='+', help='YAML config file(s)')
+parser.add_argument('--schema-file', type=str, action='store',
+                    help='YAML schema file', required=True)
+parser.add_argument('-v', '--verbose', dest='verbose', action='store_true',
+                    help='Verbose Output')
+
+args = parser.parse_args()
+schema_file = args.schema_file
+yaml_files = args.yaml_file
+verbose = args.verbose
+
+def load_yaml_file(file_name):
+    with open(file_name, 'r') as stream:
+        try:
+            return yaml.load(stream)
+        except yaml.YAMLError as exc:
+            print(exc)
+            raise
+
+# load the schema
+schema = load_yaml_file(schema_file)
+validator = cerberus.Validator(schema)
+
+# validate yaml files
+for yaml_file in yaml_files:
+    if verbose: print("Validating {:}".format(yaml_file))
+    document = load_yaml_file(yaml_file)
+    # ignore top-level entries prefixed with __
+    for key in document.keys():
+        if key.startswith('__'): del document[key]
+
+    if not validator.validate(document):
+        print("Validation Errors:")
+        print(validator.errors)
+        print("")
+        raise Exception("Validation of {:} failed".format(yaml_file))
+