Tools: add validate_json.py

Can be used to validate the schemas under
https://github.com/mavlink/mavlink/tree/master/component_information

Tools/validate_json.py

@@ -0,0 +1,47 @@
+#! /usr/bin/env python3
+""" Script to validate JSON file(s) against a schema file according to
+https://json-schema.org/"""
+
+import argparse
+import sys
+import json
+
+try:
+    from jsonschema import validate
+except ImportError as e:
+    print("Failed to import jsonschema: " + str(e))
+    print("")
+    print("You may need to install it using:")
+    print("    pip3 install --user jsonschema")
+    print("")
+    sys.exit(1)
+
+
+parser = argparse.ArgumentParser(description='Validate JSON file(s) against a schema')
+parser.add_argument('json_file', nargs='+', help='JSON config file(s)')
+parser.add_argument('--schema-file', type=str, action='store',
+                    help='JSON 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
+json_files = args.json_file
+verbose = args.verbose
+
+# load the schema
+with open(schema_file, 'r') as stream:
+    schema = json.load(stream)
+
+# validate files
+for json_file in json_files:
+    if verbose: print("Validating {:}".format(json_file))
+    with open(json_file, 'r') as stream:
+        json_data = json.load(stream)
+
+    try:
+        validate(instance=json_data, schema=schema)
+    except:
+        print("JSON validation for {:} failed (schema: {:})".format(json_file, schema_file))
+        raise
+