def _get_well_known_file():
<EOL>default_config_dir = os.getenv(_CLOUDSDK_CONFIG_ENV_VAR)<EOL>if default_config_dir is None:<EOL><INDENT>if os.name == '<STR_LIT>':<EOL><INDENT>try:<EOL><INDENT>default_config_dir = os.path.join(os.environ['<STR_LIT>'],<EOL>_CLOUDSDK_CONFIG_DIRECTORY)<EOL><DEDENT>except KeyError:<EOL><INDENT>drive = os.environ.get('<STR_LIT>', '<STR_LIT>')<EOL>default_config_dir = os.path.join(drive, '<STR_LIT:\\>',<EOL>_CLOUDSDK_CONFIG_DIRECTORY)<EOL><DEDENT><DEDENT>else:<EOL><INDENT>default_config_dir = os.path.join(os.path.expanduser('<STR_LIT>'),<EOL>'<STR_LIT>',<EOL>_CLOUDSDK_CONFIG_DIRECTORY)<EOL><DEDENT><DEDENT>return os.path.join(default_config_dir, _WELL_KNOWN_CREDENTIALS_FILE)<EOL>
Get the well known file produced by command 'gcloud auth login'.