How to use the reprozip.common.FILE_READ function in reprozip

def test_multiple_runs(self):
        def fail(s):
            assert False, "Shouldn't be called?"
        old = Path.is_file, Path.stat
        Path.is_file = lambda s: True
        Path.stat = fail
        try:
            files, inputs, outputs = self.do_test([
                ('proc', 0, None, False),
                ('open', 0, "/some/dir", True, FILE_WDIR),
                ('exec', 0, "/some/dir/ls", "/some/dir", b'ls\0/some/cli\0'),
                ('open', 0, "/some/cli", False, FILE_WRITE),
                ('open', 0, "/some/r", False, FILE_READ),
                ('open', 0, "/some/rw", False, FILE_READ),
                ('proc', 1, None, False),
                ('open', 1, "/some/dir", True, FILE_WDIR),
                ('exec', 1, "/some/dir/ls", "/some/dir", b'ls\0'),
                ('open', 1, "/some/cli", False, FILE_READ),
                ('proc', 2, 1, True),
                ('open', 2, "/some/r", False, FILE_READ),
                ('open', 1, "/some/rw", False, FILE_WRITE),
            ])
            expected = set([
                '/some',
                '/some/dir',
                '/some/dir/ls',
                '/some/r',
                '/some/rw',
            ])

else r_name, False):
            if filename not in files:
                f = TracedFile(filename)
                f.read(run)
                files[f.path] = f
        # Go to final target
        if not r_mode & FILE_LINK:
            r_name = r_name.resolve()
        if event_type == 'exec':
            executed.add(r_name)
        if r_name not in files:
            f = TracedFile(r_name)
            files[f.path] = f
        else:
            f = files[r_name]
        if r_mode & FILE_READ:
            f.read(run)
        if r_mode & FILE_WRITE:
            f.write(run)
            # Mark the parent directory as read
            if r_name.parent not in files:
                fp = TracedFile(r_name.parent)
                fp.read(run)
                files[fp.path] = fp

        # Identifies input files
        if r_name.is_file() and r_name not in executed:
            access_files[-1].add(f)
    cur.close()

    # Further filters input files
    inputs = [[fi.path

# Loops on executed files, and opened files, at the same time
    cur = conn.cursor()
    rows = cur.execute(
        '''
        SELECT 'exec' AS event_type, name, NULL AS mode, timestamp
        FROM executed_files
        UNION ALL
        SELECT 'open' AS event_type, name, mode, timestamp
        FROM opened_files
        ORDER BY timestamp;
        ''')
    executed = set()
    run = 0
    for event_type, r_name, r_mode, r_timestamp in rows:
        if event_type == 'exec':
            r_mode = FILE_READ
        r_name = Path(normalize_path(r_name))

        # Stays on the current run
        while run_timestamps and r_timestamp > run_timestamps[0]:
            del run_timestamps[0]
            access_files.append(set())
            run += 1

        # Adds symbolic links as read files
        for filename in find_all_links(r_name.parent if r_mode & FILE_LINK
                                       else r_name, False):
            if filename not in files:
                f = TracedFile(filename)
                f.read(run)
                files[f.path] = f
        # Go to final target

# Loops on executed files, and opened files, at the same time
    cur = conn.cursor()
    rows = cur.execute(
        '''
        SELECT 'exec' AS event_type, name, NULL AS mode, timestamp
        FROM executed_files
        UNION ALL
        SELECT 'open' AS event_type, name, mode, timestamp
        FROM opened_files
        ORDER BY timestamp;
        ''')
    executed = set()
    run = 0
    for event_type, r_name, r_mode, r_timestamp in rows:
        if event_type == 'exec':
            r_mode = FILE_READ
        r_name = Path(normalize_path(r_name))

        # Stays on the current run
        while run_timestamps and r_timestamp > run_timestamps[0]:
            del run_timestamps[0]
            access_files.append(set())
            run += 1

        # Adds symbolic links as read files
        for filename in find_all_links(r_name.parent if r_mode & FILE_LINK
                                       else r_name, False):
            if filename not in files:
                f = TracedFile(filename)
                f.read(run)
                files[f.path] = f
        # Go to final target

else r_name, False):
            if filename not in files:
                f = TracedFile(filename)
                f.read(run)
                files[f.path] = f
        # Go to final target
        if not r_mode & FILE_LINK:
            r_name = r_name.resolve()
        if event_type == 'exec':
            executed.add(r_name)
        if r_name not in files:
            f = TracedFile(r_name)
            files[f.path] = f
        else:
            f = files[r_name]
        if r_mode & FILE_READ:
            f.read(run)
        if r_mode & FILE_WRITE:
            f.write(run)
            # Mark the parent directory as read
            if r_name.parent not in files:
                fp = TracedFile(r_name.parent)
                fp.read(run)
                files[fp.path] = fp

        # Identifies input files
        if r_name.is_file() and r_name not in executed:
            access_files[-1].add(f)
    cur.close()

    # Further filters input files
    inputs = [[fi.path