Update the package metadata for this package if we are building the package.
    :return:metadata - Dictionary of metadata information

def get_and_update_package_metadata():
    """
    Update the package metadata for this package if we are building the package.
    :return:metadata - Dictionary of metadata information
    """
    global setup_arguments
    global METADATA_FILENAME

    if not os.path.exists('.git') and os.path.exists(METADATA_FILENAME):
        with open(METADATA_FILENAME) as fh:
            metadata = json.load(fh)
    else:
        git = Git(version=setup_arguments['version'])
        metadata = {
            'version': git.version,
            'long_description': 'Tool to pip install missing imports and more',
            'git_hash': git.hash,
            'git_origin': git.origin,
            'git_branch': git.branch
        }
        for readme_file in ['README.rst', 'README.md', 'README.txt']:
            if os.path.exists(readme_file):
                with open(readme_file) as file_handle:
                    metadata['long_description'] = file_handle.read()
                break
        with open(METADATA_FILENAME, 'w') as fh:
            json.dump(metadata, fh)
    return metadata