How to use the salt.utils.fopen function in salt

def netstats():
    '''
    Return the network stats for this minion

    CLI Example::

        salt '*' status.netstats
    '''
    procf = '/proc/net/netstat'
    if not os.path.isfile(procf):
        return {}
    stats = salt.utils.fopen(procf, 'r').read().splitlines()
    ret = {}
    headers = ['']
    for line in stats:
        if not line:
            continue
        comps = line.split()
        if comps[0] == headers[0]:
            index = len(headers) - 1
            row = {}
            for field in range(index):
                if field < 1:
                    continue
                else:
                    row[headers[field]] = _number(comps[field])
            rowname = headers[0].replace(':', '')
            ret[rowname] = row

Execute the run in a dedicated process
        '''
        data = msg['pub']
        fn_ = os.path.join(self.proc_dir, data['jid'])
        self.opts['__ex_id'] = data['jid']
        salt.utils.daemonize_if(self.opts)

        salt.transport.jobber_stack = stack = self._setup_jobber_stack()
        # set up return destination from source
        src_estate, src_yard, src_share = msg['route']['src']
        salt.transport.jobber_estate_name = src_estate
        salt.transport.jobber_yard_name = src_yard

        sdata = {'pid': os.getpid()}
        sdata.update(data)
        with salt.utils.fopen(fn_, 'w+b') as fp_:
            fp_.write(self.serial.dumps(sdata))
        ret = {'success': False}
        function_name = data['fun']
        if function_name in self.modules.value:
            try:
                func = self.modules.value[data['fun']]
                args, kwargs = salt.minion.load_args_and_kwargs(
                    func,
                    salt.utils.args.parse_input(data['arg']),
                    data)
                sys.modules[func.__module__].__context__['retcode'] = 0

                executors = data.get('module_executors') or self.opts.get('module_executors', ['direct_call.get'])
                if isinstance(executors, six.string_types):
                    executors = [executors]
                elif not isinstance(executors, list) or not executors:

return file_hash(load, fnd)

    # if we don't have a cache entry-- lets make one
    ret['hsum'] = salt.utils.get_hash(path, __opts__['hash_type'])
    cache_dir = os.path.dirname(cache_path)
    # make cache directory if it doesn't exist
    if not os.path.exists(cache_dir):
        os.makedirs(cache_dir)
    # save the cache object "hash:mtime"
    if HAS_FCNTL:
        with salt.utils.flopen(cache_path, 'w') as fp_:
            fp_.write('{0}:{1}'.format(ret['hsum'], os.path.getmtime(path)))
            fcntl.flock(fp_.fileno(), fcntl.LOCK_UN)
        return ret
    else:
        with salt.utils.fopen(cache_path, 'w') as fp_:
            fp_.write('{0}:{1}'.format(ret['hsum'], os.path.getmtime(path)))
        return ret

raise CommandExecutionError(msg.format(config))

        return 'change'

    if not change and not present:
        # The entry is new, add it to the end of the fstab
        newline = '{0}\t\t{1}\t{2}\t{3}\t{4} {5}\n'.format(
                device,
                name,
                fstype,
                opts,
                dump,
                pass_num)
        lines.append(newline)
        try:
            with salt.utils.fopen(config, 'w+') as ofile:
                # The line was changed, commit it!
                ofile.writelines(lines)
        except (IOError, OSError):
            raise CommandExecutionError(
                'File not writable {0}'.format(
                    config
                )
            )
    if present and not change:
        # The right entry is already here
        return 'present'
    return 'new'

def __write_docker_compose(path, docker_compose):
    '''
    Write docker-compose to a temp directory
    in order to use it with docker-compose ( config check )

    :param path:

    docker_compose
        contains the docker-compose file

    :return:
    '''

    if os.path.isdir(path) is False:
        os.mkdir(path)
    f = salt.utils.fopen(os.path.join(path, dc_filename), 'w')  # pylint: disable=resource-leakage
    if f:
        f.write(docker_compose)
        f.close()
    else:
        return __standardize_result(False,
                                    'Could not write docker-compose file in {0}'.format(path),
                                    None, None)
    project = __load_project(path)
    if isinstance(project, dict):
        os.remove(os.path.join(path, dc_filename))
        return project
    return path

def token_cli(self, eauth, load):
        '''
        Create the token from the CLI and request the correct data to
        authenticate via the passed authentication mechanism
        '''
        load['cmd'] = 'mk_token'
        load['eauth'] = eauth
        sreq = salt.payload.SREQ(
                'tcp://{0[interface]}:{0[ret_port]}'.format(self.opts),
                )
        tdata = sreq.send('clear', load)
        if 'token' not in tdata:
            return tdata
        try:
            with salt.utils.fopen(self.opts['token_file'], 'w+') as fp_:
                fp_.write(tdata['token'])
        except (IOError, OSError):
            pass
        return tdata

else:
                    return ''
        else:
            dest = salt.utils.path_join(
                self.opts['cachedir'],
                'extrn_files',
                env,
                url_data.netloc,
                url_data.path
            )
            destdir = os.path.dirname(dest)
            if not os.path.isdir(destdir):
                os.makedirs(destdir)
        try:
            with contextlib.closing(url_open(url)) as srcfp:
                with salt.utils.fopen(dest, 'wb') as destfp:
                    shutil.copyfileobj(srcfp, destfp)
            return dest
        except HTTPError as ex:
            raise MinionError('HTTP error {0} reading {1}: {3}'.format(
                ex.code,
                url,
                *BaseHTTPServer.BaseHTTPRequestHandler.responses[ex.code]))
        except URLError as ex:
            raise MinionError('Error reading {0}: {1}'.format(url, ex.reason))

def _update_checksum(fname, target, checksum):
    lines = []
    compare_string = '{0}:{1}'.format(target, checksum)
    if os.path.exists(fname):
        with salt.utils.fopen(fname, 'r') as f:
            lines = f.readlines()
    with salt.utils.fopen(fname, 'w') as f:
        f.write('{0}:{1}\n'.format(target, checksum))
        for line in lines:
            if line.startswith(target):
                continue
            f.write(line)

def _read_next_ac_chunk(clear=True):
    '''
    Read and remove the content of '_mgractionchains.conf' file. Return the parsed YAML.
    '''
    f_storage_filename = _get_ac_storage_filenamepath()
    if not os.path.isfile(f_storage_filename):
        return None
    ret = None
    try:
        with salt.utils.fopen(f_storage_filename, "r") as f_storage:
            ret = yaml.load(f_storage.read())
        if clear:
            os.remove(f_storage_filename)
        return ret
    except (IOError, yaml.scanner.ScannerError) as exc:
        err_str = "Error processing YAML from '{0}': {1}".format(f_storage_filename, exc)
        log.error(err_str)
        raise CommandExecutionError(err_str)