We are currently solving the following issue within our repository. Here is the issue text:
--- BEGIN ISSUE ---
Add log message to get_user_config function
there should be debug message for cases when default config overwrites user_config. 
Currently, it is done silently.

--- END ISSUE ---

Below are some code segments, each from a relevant file. One or more of these files may contain bugs.
--- BEGIN FILES ---
Path: `cookiecutter/config.py`
Content:
```
1 # -*- coding: utf-8 -*-
2 
3 """Global configuration handling."""
4 
5 from __future__ import unicode_literals
6 import copy
7 import logging
8 import os
9 import io
10 import collections
11 
12 import poyo
13 
14 from cookiecutter.exceptions import ConfigDoesNotExistException
15 from cookiecutter.exceptions import InvalidConfiguration
16 
17 
18 logger = logging.getLogger(__name__)
19 
20 USER_CONFIG_PATH = os.path.expanduser('~/.cookiecutterrc')
21 
22 BUILTIN_ABBREVIATIONS = {
23     'gh': 'https://github.com/{0}.git',
24     'gl': 'https://gitlab.com/{0}.git',
25     'bb': 'https://bitbucket.org/{0}',
26 }
27 
28 DEFAULT_CONFIG = {
29     'cookiecutters_dir': os.path.expanduser('~/.cookiecutters/'),
30     'replay_dir': os.path.expanduser('~/.cookiecutter_replay/'),
31     'default_context': collections.OrderedDict([]),
32     'abbreviations': BUILTIN_ABBREVIATIONS,
33 }
34 
35 
36 def _expand_path(path):
37     """Expand both environment variables and user home in the given path."""
38     path = os.path.expandvars(path)
39     path = os.path.expanduser(path)
40     return path
41 
42 
43 def merge_configs(default, overwrite):
44     """Recursively update a dict with the key/value pair of another.
45 
46     Dict values that are dictionaries themselves will be updated, whilst
47     preserving existing keys.
48     """
49     new_config = copy.deepcopy(default)
50 
51     for k, v in overwrite.items():
52         # Make sure to preserve existing items in
53         # nested dicts, for example `abbreviations`
54         if isinstance(v, dict):
55             new_config[k] = merge_configs(default[k], v)
56         else:
57             new_config[k] = v
58 
59     return new_config
60 
61 
62 def get_config(config_path):
63     """Retrieve the config from the specified path, returning a config dict."""
64     if not os.path.exists(config_path):
65         raise ConfigDoesNotExistException
66 
67     logger.debug('config_path is %s', config_path)
68     with io.open(config_path, encoding='utf-8') as file_handle:
69         try:
70             yaml_dict = poyo.parse_string(file_handle.read())
71         except poyo.exceptions.PoyoException as e:
72             raise InvalidConfiguration(
73                 'Unable to parse YAML file {}. Error: {}'
74                 ''.format(config_path, e)
75             )
76 
77     config_dict = merge_configs(DEFAULT_CONFIG, yaml_dict)
78 
79     raw_replay_dir = config_dict['replay_dir']
80     config_dict['replay_dir'] = _expand_path(raw_replay_dir)
81 
82     raw_cookies_dir = config_dict['cookiecutters_dir']
83     config_dict['cookiecutters_dir'] = _expand_path(raw_cookies_dir)
84 
85     return config_dict
86 
87 
88 def get_user_config(config_file=None, default_config=False):
89     """Return the user config as a dict.
90 
91     If ``default_config`` is True, ignore ``config_file`` and return default
92     values for the config parameters.
93 
94     If a path to a ``config_file`` is given, that is different from the default
95     location, load the user config from that.
96 
97     Otherwise look up the config file path in the ``COOKIECUTTER_CONFIG``
98     environment variable. If set, load the config from this path. This will
99     raise an error if the specified path is not valid.
100 
101     If the environment variable is not set, try the default config file path
102     before falling back to the default config values.
103     """
104     # Do NOT load a config. Return defaults instead.
105     if default_config:
106         return copy.copy(DEFAULT_CONFIG)
107 
108     # Load the given config file
109     if config_file and config_file is not USER_CONFIG_PATH:
110         return get_config(config_file)
111 
112     try:
113         # Does the user set up a config environment variable?
114         env_config_file = os.environ['COOKIECUTTER_CONFIG']
115     except KeyError:
116         # Load an optional user config if it exists
117         # otherwise return the defaults
118         if os.path.exists(USER_CONFIG_PATH):
119             return get_config(USER_CONFIG_PATH)
120         else:
121             return copy.copy(DEFAULT_CONFIG)
122     else:
123         # There is a config environment variable. Try to load it.
124         # Do not check for existence, so invalid file paths raise an error.
125         return get_config(env_config_file)
126
```
--- END FILES ---

Please first localize the bug based on the issue statement, and then generate a patch according to the `git diff` format fenced by three backticks.

Here is an example:

```diff
diff --git a/examples/server_async.py b/examples/server_async.py
--- a/examples/server_async.py
+++ b/examples/server_async.py
@@ -313,4 +313,4 @@
 
 
 if __name__ == "__main__":
-    asyncio.run(run_async_server("."), debug=True)
+    asyncio.run(run_async_server(), debug=True)
diff --git a/examples/server_sync.py b/examples/server_sync.py
--- a/examples/server_sync.py
+++ b/examples/server_sync.py
@@ -313,5 +313,5 @@
 
 
 if __name__ == "__main__":
-    server = run_sync_server(".")
+    server = run_sync_server()
     server.shutdown()

```

diff --git a/cookiecutter/config.py b/cookiecutter/config.py
--- a/cookiecutter/config.py
+++ b/cookiecutter/config.py
@@ -103,10 +103,12 @@
     """
     # Do NOT load a config. Return defaults instead.
     if default_config:
+        logger.debug("Force ignoring user config with default_config switch.")
         return copy.copy(DEFAULT_CONFIG)
 
     # Load the given config file
     if config_file and config_file is not USER_CONFIG_PATH:
+        logger.debug("Loading custom config from %s.", config_file)
         return get_config(config_file)
 
     try:
@@ -116,10 +118,13 @@
         # Load an optional user config if it exists
         # otherwise return the defaults
         if os.path.exists(USER_CONFIG_PATH):
+            logger.debug("Loading config from %s.", USER_CONFIG_PATH)
             return get_config(USER_CONFIG_PATH)
         else:
+            logger.debug("User config not found. Loading default config.")
             return copy.copy(DEFAULT_CONFIG)
     else:
         # There is a config environment variable. Try to load it.
         # Do not check for existence, so invalid file paths raise an error.
+        logger.debug("User config not found or not specified. Loading default config.")
         return get_config(env_config_file)

{"golden_diff": "diff --git a/cookiecutter/config.py b/cookiecutter/config.py\n--- a/cookiecutter/config.py\n+++ b/cookiecutter/config.py\n@@ -103,10 +103,12 @@\n     \"\"\"\n     # Do NOT load a config. Return defaults instead.\n     if default_config:\n+        logger.debug(\"Force ignoring user config with default_config switch.\")\n         return copy.copy(DEFAULT_CONFIG)\n \n     # Load the given config file\n     if config_file and config_file is not USER_CONFIG_PATH:\n+        logger.debug(\"Loading custom config from %s.\", config_file)\n         return get_config(config_file)\n \n     try:\n@@ -116,10 +118,13 @@\n         # Load an optional user config if it exists\n         # otherwise return the defaults\n         if os.path.exists(USER_CONFIG_PATH):\n+            logger.debug(\"Loading config from %s.\", USER_CONFIG_PATH)\n             return get_config(USER_CONFIG_PATH)\n         else:\n+            logger.debug(\"User config not found. Loading default config.\")\n             return copy.copy(DEFAULT_CONFIG)\n     else:\n         # There is a config environment variable. Try to load it.\n         # Do not check for existence, so invalid file paths raise an error.\n+        logger.debug(\"User config not found or not specified. Loading default config.\")\n         return get_config(env_config_file)\n", "issue": "Add log message to get_user_config function\nthere should be debug message for cases when default config overwrites user_config. \r\nCurrently, it is done silently.\n", "before_files": [{"content": "# -*- coding: utf-8 -*-\n\n\"\"\"Global configuration handling.\"\"\"\n\nfrom __future__ import unicode_literals\nimport copy\nimport logging\nimport os\nimport io\nimport collections\n\nimport poyo\n\nfrom cookiecutter.exceptions import ConfigDoesNotExistException\nfrom cookiecutter.exceptions import InvalidConfiguration\n\n\nlogger = logging.getLogger(__name__)\n\nUSER_CONFIG_PATH = os.path.expanduser('~/.cookiecutterrc')\n\nBUILTIN_ABBREVIATIONS = {\n    'gh': 'https://github.com/{0}.git',\n    'gl': 'https://gitlab.com/{0}.git',\n    'bb': 'https://bitbucket.org/{0}',\n}\n\nDEFAULT_CONFIG = {\n    'cookiecutters_dir': os.path.expanduser('~/.cookiecutters/'),\n    'replay_dir': os.path.expanduser('~/.cookiecutter_replay/'),\n    'default_context': collections.OrderedDict([]),\n    'abbreviations': BUILTIN_ABBREVIATIONS,\n}\n\n\ndef _expand_path(path):\n    \"\"\"Expand both environment variables and user home in the given path.\"\"\"\n    path = os.path.expandvars(path)\n    path = os.path.expanduser(path)\n    return path\n\n\ndef merge_configs(default, overwrite):\n    \"\"\"Recursively update a dict with the key/value pair of another.\n\n    Dict values that are dictionaries themselves will be updated, whilst\n    preserving existing keys.\n    \"\"\"\n    new_config = copy.deepcopy(default)\n\n    for k, v in overwrite.items():\n        # Make sure to preserve existing items in\n        # nested dicts, for example `abbreviations`\n        if isinstance(v, dict):\n            new_config[k] = merge_configs(default[k], v)\n        else:\n            new_config[k] = v\n\n    return new_config\n\n\ndef get_config(config_path):\n    \"\"\"Retrieve the config from the specified path, returning a config dict.\"\"\"\n    if not os.path.exists(config_path):\n        raise ConfigDoesNotExistException\n\n    logger.debug('config_path is %s', config_path)\n    with io.open(config_path, encoding='utf-8') as file_handle:\n        try:\n            yaml_dict = poyo.parse_string(file_handle.read())\n        except poyo.exceptions.PoyoException as e:\n            raise InvalidConfiguration(\n                'Unable to parse YAML file {}. Error: {}'\n                ''.format(config_path, e)\n            )\n\n    config_dict = merge_configs(DEFAULT_CONFIG, yaml_dict)\n\n    raw_replay_dir = config_dict['replay_dir']\n    config_dict['replay_dir'] = _expand_path(raw_replay_dir)\n\n    raw_cookies_dir = config_dict['cookiecutters_dir']\n    config_dict['cookiecutters_dir'] = _expand_path(raw_cookies_dir)\n\n    return config_dict\n\n\ndef get_user_config(config_file=None, default_config=False):\n    \"\"\"Return the user config as a dict.\n\n    If ``default_config`` is True, ignore ``config_file`` and return default\n    values for the config parameters.\n\n    If a path to a ``config_file`` is given, that is different from the default\n    location, load the user config from that.\n\n    Otherwise look up the config file path in the ``COOKIECUTTER_CONFIG``\n    environment variable. If set, load the config from this path. This will\n    raise an error if the specified path is not valid.\n\n    If the environment variable is not set, try the default config file path\n    before falling back to the default config values.\n    \"\"\"\n    # Do NOT load a config. Return defaults instead.\n    if default_config:\n        return copy.copy(DEFAULT_CONFIG)\n\n    # Load the given config file\n    if config_file and config_file is not USER_CONFIG_PATH:\n        return get_config(config_file)\n\n    try:\n        # Does the user set up a config environment variable?\n        env_config_file = os.environ['COOKIECUTTER_CONFIG']\n    except KeyError:\n        # Load an optional user config if it exists\n        # otherwise return the defaults\n        if os.path.exists(USER_CONFIG_PATH):\n            return get_config(USER_CONFIG_PATH)\n        else:\n            return copy.copy(DEFAULT_CONFIG)\n    else:\n        # There is a config environment variable. Try to load it.\n        # Do not check for existence, so invalid file paths raise an error.\n        return get_config(env_config_file)\n", "path": "cookiecutter/config.py"}], "after_files": [{"content": "# -*- coding: utf-8 -*-\n\n\"\"\"Global configuration handling.\"\"\"\n\nfrom __future__ import unicode_literals\nimport copy\nimport logging\nimport os\nimport io\nimport collections\n\nimport poyo\n\nfrom cookiecutter.exceptions import ConfigDoesNotExistException\nfrom cookiecutter.exceptions import InvalidConfiguration\n\n\nlogger = logging.getLogger(__name__)\n\nUSER_CONFIG_PATH = os.path.expanduser('~/.cookiecutterrc')\n\nBUILTIN_ABBREVIATIONS = {\n    'gh': 'https://github.com/{0}.git',\n    'gl': 'https://gitlab.com/{0}.git',\n    'bb': 'https://bitbucket.org/{0}',\n}\n\nDEFAULT_CONFIG = {\n    'cookiecutters_dir': os.path.expanduser('~/.cookiecutters/'),\n    'replay_dir': os.path.expanduser('~/.cookiecutter_replay/'),\n    'default_context': collections.OrderedDict([]),\n    'abbreviations': BUILTIN_ABBREVIATIONS,\n}\n\n\ndef _expand_path(path):\n    \"\"\"Expand both environment variables and user home in the given path.\"\"\"\n    path = os.path.expandvars(path)\n    path = os.path.expanduser(path)\n    return path\n\n\ndef merge_configs(default, overwrite):\n    \"\"\"Recursively update a dict with the key/value pair of another.\n\n    Dict values that are dictionaries themselves will be updated, whilst\n    preserving existing keys.\n    \"\"\"\n    new_config = copy.deepcopy(default)\n\n    for k, v in overwrite.items():\n        # Make sure to preserve existing items in\n        # nested dicts, for example `abbreviations`\n        if isinstance(v, dict):\n            new_config[k] = merge_configs(default[k], v)\n        else:\n            new_config[k] = v\n\n    return new_config\n\n\ndef get_config(config_path):\n    \"\"\"Retrieve the config from the specified path, returning a config dict.\"\"\"\n    if not os.path.exists(config_path):\n        raise ConfigDoesNotExistException\n\n    logger.debug('config_path is %s', config_path)\n    with io.open(config_path, encoding='utf-8') as file_handle:\n        try:\n            yaml_dict = poyo.parse_string(file_handle.read())\n        except poyo.exceptions.PoyoException as e:\n            raise InvalidConfiguration(\n                'Unable to parse YAML file {}. Error: {}'\n                ''.format(config_path, e)\n            )\n\n    config_dict = merge_configs(DEFAULT_CONFIG, yaml_dict)\n\n    raw_replay_dir = config_dict['replay_dir']\n    config_dict['replay_dir'] = _expand_path(raw_replay_dir)\n\n    raw_cookies_dir = config_dict['cookiecutters_dir']\n    config_dict['cookiecutters_dir'] = _expand_path(raw_cookies_dir)\n\n    return config_dict\n\n\ndef get_user_config(config_file=None, default_config=False):\n    \"\"\"Return the user config as a dict.\n\n    If ``default_config`` is True, ignore ``config_file`` and return default\n    values for the config parameters.\n\n    If a path to a ``config_file`` is given, that is different from the default\n    location, load the user config from that.\n\n    Otherwise look up the config file path in the ``COOKIECUTTER_CONFIG``\n    environment variable. If set, load the config from this path. This will\n    raise an error if the specified path is not valid.\n\n    If the environment variable is not set, try the default config file path\n    before falling back to the default config values.\n    \"\"\"\n    # Do NOT load a config. Return defaults instead.\n    if default_config:\n        logger.debug(\"Force ignoring user config with default_config switch.\")\n        return copy.copy(DEFAULT_CONFIG)\n\n    # Load the given config file\n    if config_file and config_file is not USER_CONFIG_PATH:\n        logger.debug(\"Loading custom config from %s.\", config_file)\n        return get_config(config_file)\n\n    try:\n        # Does the user set up a config environment variable?\n        env_config_file = os.environ['COOKIECUTTER_CONFIG']\n    except KeyError:\n        # Load an optional user config if it exists\n        # otherwise return the defaults\n        if os.path.exists(USER_CONFIG_PATH):\n            logger.debug(\"Loading config from %s.\", USER_CONFIG_PATH)\n            return get_config(USER_CONFIG_PATH)\n        else:\n            logger.debug(\"User config not found. Loading default config.\")\n            return copy.copy(DEFAULT_CONFIG)\n    else:\n        # There is a config environment variable. Try to load it.\n        # Do not check for existence, so invalid file paths raise an error.\n        logger.debug(\"User config not found or not specified. Loading default config.\")\n        return get_config(env_config_file)\n", "path": "cookiecutter/config.py"}]}