Improve logging when generating config files (#5510)

Make it a bit clearer what's going on.

changelog.d/5510.misc

@@ -0,0 +1 @@
+Improve logging when generating config files.

synapse/config/_base.py

@@ -289,6 +289,7 @@ def load_or_generate_config(cls, description, argv):
                 )
             (config_path,) = config_files
             if not cls.path_exists(config_path):
+                print("Generating config file %s" % (config_path,))
                 if config_args.keys_directory:
                     config_dir_path = config_args.keys_directory
                 else:
@@ -331,7 +332,7 @@ def load_or_generate_config(cls, description, argv):
             else:
                 print(
                     (
-                        "Config file %r already exists. Generating any missing key"
+                        "Config file %r already exists. Generating any missing config"
                         " files."
                     )
                     % (config_path,)

synapse/config/key.py

@@ -241,6 +241,7 @@ def generate_files(self, config):
         signing_key_path = config["signing_key_path"]
 
         if not self.path_exists(signing_key_path):
+            print("Generating signing key file %s" % (signing_key_path,))
             with open(signing_key_path, "w") as signing_key_file:
                 key_id = "a_" + random_string(4)
                 write_signing_keys(signing_key_file, (generate_signing_key(key_id),))

synapse/config/logger.py

@@ -137,6 +137,10 @@ def generate_files(self, config):
         log_config = config.get("log_config")
         if log_config and not os.path.exists(log_config):
             log_file = self.abspath("homeserver.log")
+            print(
+                "Generating log config file %s which will log to %s"
+                % (log_config, log_file)
+            )
             with open(log_config, "w") as log_config_file:
                 log_config_file.write(DEFAULT_LOG_CONFIG.substitute(log_file=log_file))