How to use the reprozip.tracer.linux_pkgs.identify_packages function in reprozip

database = directory / 'trace.sqlite3'

    assert database.is_file()
    if PY3:
        # On PY3, connect() only accepts unicode
        conn = sqlite3.connect(str(database))
    else:
        conn = sqlite3.connect(database.path)
    conn.row_factory = sqlite3.Row

    # Reads info from database
    files, inputs, outputs = get_files(conn)

    # Identifies which file comes from which package
    if sort_packages:
        files, packages = identify_packages(files)
    else:
        packages = []

    # Writes configuration file
    config = directory / 'config.yml'
    distribution = [distro.id(), distro.version()]
    cur = conn.cursor()
    if overwrite or not config.exists():
        runs = []
        # This gets all the top-level processes (p.parent ISNULL) and the first
        # executed file for that process (sorting by ids, which are
        # chronological)
        executions = cur.execute(
            '''
            SELECT e.name, e.argv, e.envp, e.workingdir, p.exitcode
            FROM processes p

def canonicalize_config(packages, other_files, additional_patterns,
                        sort_packages):
    """Expands ``additional_patterns`` from the configuration file.
    """
    if additional_patterns:
        add_files = expand_patterns(additional_patterns)
        logger.info("Found %d files from expanding additional_patterns...",
                    len(add_files))
        if add_files:
            if sort_packages:
                add_files, add_packages = identify_packages(add_files)
            else:
                add_packages = []
            other_files, packages = combine_files(add_files, add_packages,
                                                  other_files, packages)
    return packages, other_files

def canonicalize_config(runs, packages, other_files, additional_patterns,
                        sort_packages):
    add_files = expand_patterns(additional_patterns)
    if sort_packages:
        add_files, add_packages = identify_packages(add_files)
    else:
        add_packages = []
    other_files, packages = merge_files(add_files, add_packages,
                                        other_files, packages)
    return runs, packages, other_files

"""
    database = directory / 'trace.sqlite3'

    if PY3:
        # On PY3, connect() only accepts unicode
        conn = sqlite3.connect(str(database))
    else:
        conn = sqlite3.connect(database.path)
    conn.row_factory = sqlite3.Row

    # Reads info from database
    files, inputs, outputs = get_files(conn)

    # Identifies which file comes from which package
    if sort_packages:
        files, packages = identify_packages(files)
    else:
        packages = []

    # Writes configuration file
    config = directory / 'config.yml'
    distribution = platform.linux_distribution()[0:2]
    cur = conn.cursor()
    if overwrite or not config.exists():
        runs = []
        # This gets all the top-level processes (p.parent ISNULL) and the first
        # executed file for that process (sorting by ids, which are
        # chronological)
        executions = cur.execute(
            '''
            SELECT e.name, e.argv, e.envp, e.workingdir, p.exitcode
            FROM processes p