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

def trace(binary, argv, directory, append, verbosity=1):
    """Main function for the trace subcommand.
    """
    cwd = Path.cwd()
    if (any(cwd.lies_under(c) for c in magic_dirs + system_dirs) and
            not cwd.lies_under('/usr/local')):
        logging.warning(
            "You are running this experiment from a system directory! "
            "Autodetection of non-system files will probably not work as "
            "intended")

    # Trace directory
    if directory.exists():
        if append is None:
            r = tty_prompt(
                "Trace directory %s exists\n"
                "(a)ppend run to the trace, (d)elete it or (s)top? [a/d/s] " %
                directory,
                'aAdDsS')
            if r is None:
                logging.critical(

cur.close()

    # Further filters input files
    inputs = [[fi.path
               for fi in lst
               # Input files are regular files,
               if fi.path.is_file() and
               # ONLY_READ,
               fi.runs[r] == TracedFile.ONLY_READ and
               # not executable,
               # FIXME : currently disabled; only remove executed files
               # not fi.path.stat().st_mode & 0b111 and
               fi.path not in executed and
               # not in a system directory
               not any(fi.path.lies_under(m)
                       for m in magic_dirs + system_dirs)]
              for r, lst in enumerate(access_files)]

    # Identify output files
    outputs = [[fi.path
                for fi in lst
                # Output files are regular files,
                if fi.path.is_file() and
                # WRITTEN
                fi.runs[r] == TracedFile.WRITTEN and
                # not in a system directory
                not any(fi.path.lies_under(m)
                        for m in magic_dirs + system_dirs)]
               for r, lst in enumerate(access_files)]

    # Run the list of files through the filter plugins
    run_filter_plugins(files, inputs)

if fi.what == TracedFile.READ_THEN_WRITTEN and
        not any(fi.path.lies_under(m) for m in magic_dirs)]
    if read_then_written_files:
        logger.warning(
            "Some files were read and then written. We will only pack the "
            "final version of the file; reproducible experiments shouldn't "
            "change their input files")
        logger.info("Paths:\n%s",
                    ", ".join(unicode_(fi.path)
                              for fi in read_then_written_files))

    files = set(
        fi
        for fi in itervalues(files)
        if fi.what != TracedFile.WRITTEN and not any(fi.path.lies_under(m)
                                                     for m in magic_dirs))
    return files, inputs, outputs

cur.close()

    # Further filters input files
    inputs = [[fi.path
               for fi in lst
               # Input files are regular files,
               if fi.path.is_file() and
               # ONLY_READ,
               fi.runs[r] == TracedFile.ONLY_READ and
               # not executable,
               # FIXME : currently disabled; only remove executed files
               # not fi.path.stat().st_mode & 0b111 and
               fi.path not in executed and
               # not in a system directory
               not any(fi.path.lies_under(m)
                       for m in magic_dirs + system_dirs)]
              for r, lst in enumerate(access_files)]

    # Identify output files
    outputs = [[fi.path
                for fi in lst
                # Output files are regular files,
                if fi.path.is_file() and
                # WRITTEN
                fi.runs[r] == TracedFile.WRITTEN and
                # not in a system directory
                not any(fi.path.lies_under(m)
                        for m in magic_dirs + system_dirs)]
               for r, lst in enumerate(access_files)]

    # Run the list of files through the filter plugins
    run_filter_plugins(files, inputs)