Function _get_extra_data_path

mne/utils/config.py:475–522

Get path to extra data (config, tables, etc.).

(home_dir=None)

def _get_extra_data_path(home_dir=None):
    """Get path to extra data (config, tables, etc.)."""
    global _temp_home_dir
    if home_dir is None:
        home_dir = os.environ.get("_MNE_FAKE_HOME_DIR")
    if home_dir is None:
        # this has been checked on OSX64, Linux64, and Win32
        if "nt" == os.name.lower():
            APPDATA_DIR = os.getenv("APPDATA")
            USERPROFILE_DIR = os.getenv("USERPROFILE")
            if APPDATA_DIR is not None and op.isdir(
                op.join(APPDATA_DIR, ".mne")
            ):  # backward-compat
                home_dir = APPDATA_DIR
            elif USERPROFILE_DIR is not None:
                home_dir = USERPROFILE_DIR
            else:
                raise FileNotFoundError(
                    "The USERPROFILE environment variable is not set, cannot "
                    "determine the location of the MNE-Python configuration "
                    "folder"
                )
            del APPDATA_DIR, USERPROFILE_DIR
        else:
            # This is a more robust way of getting the user's home folder on
            # Linux platforms (not sure about OSX, Unix or BSD) than checking
            # the HOME environment variable. If the user is running some sort
            # of script that isn't launched via the command line (e.g. a script
            # launched via Upstart) then the HOME environment variable will
            # not be set.
            if os.getenv("MNE_DONTWRITE_HOME", "") == "true":
                if _temp_home_dir is None:
                    _temp_home_dir = tempfile.mkdtemp()
                    atexit.register(
                        partial(shutil.rmtree, _temp_home_dir, ignore_errors=True)
                    )
                home_dir = _temp_home_dir
            else:
                home_dir = os.path.expanduser("~")

        if home_dir is None:
            raise ValueError(
                "mne-python config file path could "
                "not be determined, please report this "
                "error to mne-python developers"
            )

    return op.join(home_dir, ".mne")


def get_subjects_dir(subjects_dir=None, raise_error=False):