Merge pull request #107 from jlusiardi/fix_85_initialize_alias_file

add first draft for a fix of #85

homekit/controller.py

@@ -134,11 +134,12 @@ def load_data(self, filename):
                 for pairing_id in data:
                     self.pairings[pairing_id] = Pairing(data[pairing_id])
         except PermissionError as e:
-            raise ConfigLoadingError('Could not open "{f}" due to missing permissions'.format(f=filename))
+            raise ConfigLoadingError('Could not open "{f}" due to missing permissions.'.format(f=filename))
         except JSONDecodeError as e:
-            raise ConfigLoadingError('Cannot parse "{f}" as JSON file'.format(f=filename))
+            raise ConfigLoadingError('Cannot parse "{f}" as JSON file.'.format(f=filename))
         except FileNotFoundError as e:
-            raise ConfigLoadingError('Could not open "{f}" because it does not exist'.format(f=filename))
+            raise ConfigLoadingError('Could not open "{f}" because it does not exist. Use "python3 -m'
+                                     ' homekit.init_controller_storage -f {f}" to initialize it.'.format(f=filename))
 
     def save_data(self, filename):
         """

homekit/init_controller_storage.py

@@ -0,0 +1,38 @@
+#!/usr/bin/env python3
+
+#
+# Copyright 2018 Joachim Lusiardi
+#
+# 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.
+#
+
+import argparse
+import os
+
+
+def setup_args_parser():
+    parser = argparse.ArgumentParser(description='HomeKit initialize storage')
+    parser.add_argument('-f', action='store', required=True, dest='file', help='HomeKit pairing data file')
+    return parser.parse_args()
+
+
+if __name__ == '__main__':
+    args = setup_args_parser()
+    if not os.path.isfile(args.file):
+        try:
+            with open(args.file, 'w') as fp:
+                fp.write('{}')
+        except PermissionError:
+            print('Permission denied to create file "{f}".'.format(f=args.file))
+    else:
+        print('File "{f}" already exists.'.format(f=args.file))