How to use the fbs.resources._copy function in fbs

def _generate_resources():
    """
    Copy the data files from src/main/resources to ${freeze_dir}.
    Automatically filters files mentioned in the setting files_to_filter:
    Placeholders such as ${app_name} are automatically replaced by the
    corresponding setting in files on that list.
    """
    freeze_dir = path('${freeze_dir}')
    if is_mac():
        resources_dest_dir = join(freeze_dir, 'Contents', 'Resources')
    else:
        resources_dest_dir = freeze_dir
    for path_fn in default_path, path:
        for profile in LOADED_PROFILES:
            _copy(path_fn, 'src/main/resources/' + profile, resources_dest_dir)
            _copy(path_fn, 'src/freeze/' + profile, freeze_dir)

def _generate_resources():
    """
    Copy the data files from src/main/resources to ${freeze_dir}.
    Automatically filters files mentioned in the setting files_to_filter:
    Placeholders such as ${app_name} are automatically replaced by the
    corresponding setting in files on that list.
    """
    freeze_dir = path('${freeze_dir}')
    if is_mac():
        resources_dest_dir = join(freeze_dir, 'Contents', 'Resources')
    else:
        resources_dest_dir = freeze_dir
    for path_fn in default_path, path:
        for profile in LOADED_PROFILES:
            _copy(path_fn, 'src/main/resources/' + profile, resources_dest_dir)
            _copy(path_fn, 'src/freeze/' + profile, freeze_dir)

require_existing_project()
    build_dir = path('target/%s-docker-image' % name)
    if exists(build_dir):
        rmtree(build_dir)
    src_root = 'src/build/docker'
    available_vms = set(listdir(default_path(src_root)))
    if exists(path(src_root)):
        available_vms.update(listdir(path(src_root)))
    if name not in available_vms:
        raise FbsError(
            'Could not find %s. Available VMs are:%s' %
            (name, ''.join(['\n * ' + vm for vm in available_vms]))
        )
    src_dir = src_root + '/' + name
    for path_fn in default_path, path:
        _copy(path_fn, src_dir, build_dir)
    settings = SETTINGS['docker_images'].get(name, {})
    for path_fn in default_path, path:
        for p in settings.get('build_files', []):
            _copy(path_fn, p, build_dir)
    args = ['build', '--pull', '-t', _get_docker_id(name), build_dir]
    for arg, value in settings.get('build_args', {}).items():
        args.extend(['--build-arg', '%s=%s' % (arg, value)])
    try:
        _run_docker(
            args, check=True, stdout=PIPE, stderr=PIPE,
            universal_newlines=True
        )
    except CalledProcessError as e:
        if '/private-key.gpg: no such file or directory' in e.stderr:
            message = 'Could not find private-key.gpg. Maybe you want to ' \
                      'run:\n    fbs gengpgkey'

src_root = 'src/build/docker'
    available_vms = set(listdir(default_path(src_root)))
    if exists(path(src_root)):
        available_vms.update(listdir(path(src_root)))
    if name not in available_vms:
        raise FbsError(
            'Could not find %s. Available VMs are:%s' %
            (name, ''.join(['\n * ' + vm for vm in available_vms]))
        )
    src_dir = src_root + '/' + name
    for path_fn in default_path, path:
        _copy(path_fn, src_dir, build_dir)
    settings = SETTINGS['docker_images'].get(name, {})
    for path_fn in default_path, path:
        for p in settings.get('build_files', []):
            _copy(path_fn, p, build_dir)
    args = ['build', '--pull', '-t', _get_docker_id(name), build_dir]
    for arg, value in settings.get('build_args', {}).items():
        args.extend(['--build-arg', '%s=%s' % (arg, value)])
    try:
        _run_docker(
            args, check=True, stdout=PIPE, stderr=PIPE,
            universal_newlines=True
        )
    except CalledProcessError as e:
        if '/private-key.gpg: no such file or directory' in e.stderr:
            message = 'Could not find private-key.gpg. Maybe you want to ' \
                      'run:\n    fbs gengpgkey'
        else:
            message = e.stdout + '\n' + e.stderr
        raise FbsError(message)
    _LOG.info('Done. You can now execute:\n    fbs runvm ' + name)

def _generate_installer_resources():
    for path_fn in default_path, path:
        for profile in LOADED_PROFILES:
            _copy(path_fn, 'src/installer/' + profile, path('target/installer'))