Add linter rule for ZCL file being in sync

.github/workflows/lint.yml

@@ -85,6 +85,10 @@ jobs:
               if: always()
               run: scripts/tools/check_includes.sh
 
+            - name: Check for zcl.json and extension sync status
+              if: always()
+              run: scripts/tools/check_zcl_file_sync.py .
+
             - name: Ensure all PICS are set for tests (to true or false)
               if: always()
               run: |

scripts/tools/check_zcl_file_sync.py

@@ -0,0 +1,71 @@
+#!/usr/bin/env python3
+#
+# Copyright (c) 2022 Project CHIP Authors
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+"""
+Validates that the json zcl files that are used by the app are in sync.
+
+Current rule:
+  - all-clusters app uses an extension on top of the "standard" zcl file.
+    Ensure that the two fies are in sync EXCEPT the extension.
+"""
+
+import json
+import sys
+import os
+import difflib
+
+def main():
+    if len(sys.argv) != 2:
+        print('Please pass CHIP_ROOT as an argument (and only chip root)');
+        return 1
+
+    base_name = os.path.join(sys.argv[1], "src", "app", "zap-templates", "zcl", "zcl.json")
+    ext_name = os.path.join(sys.argv[1], "src", "app", "zap-templates", "zcl", "zcl-with-test-extensions.json")
+
+    base_data = json.load(open(base_name))
+    ext_data = json.load(open(ext_name))
+
+    # ext should be IDENTICAL with base if we add a few things to base:
+    base_data["xmlRoot"].append("./data-model/test")
+    base_data["xmlFile"].append("mode-select-extensions.xml")
+
+    # do not care about sorting. mainly do not check if extension xml
+    # is at the end or in the middle
+    base_data["xmlFile"].sort()
+    ext_data["xmlFile"].sort()
+
+    if base_data == ext_data:
+        return 0
+
+    print("%s and %s have unexpected differences." % (base_name, ext_name))
+    print("Differences between expected and actual:")
+
+    for l in difflib.unified_diff(
+        json.dumps(ext_data, indent=2).split('\n'),
+        json.dumps(base_data, indent=2).split('\n'),
+        fromfile=ext_name,
+        tofile="<Expected extension file content>",
+    ):
+        if l.endswith('\n'):
+            l = l[:-1]
+        print(l)
+
+    return 1
+
+
+if __name__ == '__main__':
+    sys.exit(main())