# Buggy code
def update():
    """
    Update the cache file for the bucket.
    """

    metadata = _init()

    if S3_SYNC_ON_UPDATE:
        # sync the buckets to the local cache
        log.info("Syncing local cache from S3...")
        for saltenv, env_meta in six.iteritems(metadata):
            for bucket_files in _find_files(env_meta):
                for bucket, files in six.iteritems(bucket_files):
                    for file_path in files:
                        cached_file_path = _get_cached_file_name(
                            bucket, saltenv, file_path
                        )
                        log.info("%s - %s : %s", bucket, saltenv, file_path)

                        # load the file from S3 if it's not in the cache or it's old
                        _get_file_from_s3(
                            metadata, saltenv, bucket, file_path, cached_file_path
                        )

        log.info("Sync local cache from S3 completed.")


# Traceback (ValueError)
Exception occurred in runner state.orchestrate: Traceback (most recent call last):
File "/usr/lib/python2.7/site-packages/salt/client/mixins.py", line 382, in _low
data['return'] = self.functions[fun](*args, **kwargs)
File "/usr/lib/python2.7/site-packages/salt/runners/state.py", line 88, in orchestrate
orchestration_jid=orchestration_jid)
File "/usr/lib/python2.7/site-packages/salt/modules/state.py", line 1098, in sls
initial_pillar=_get_initial_pillar(opts))
File "/usr/lib/python2.7/site-packages/salt/state.py", line 3846, in __init__
BaseHighState.__init__(self, opts)
File "/usr/lib/python2.7/site-packages/salt/state.py", line 2721, in __init__
self.avail = self.__gather_avail()
File "/usr/lib/python2.7/site-packages/salt/state.py", line 2730, in __gather_avail
for saltenv in self._get_envs():
File "/usr/lib/python2.7/site-packages/salt/state.py", line 2791, in _get_envs
client_envs = self.client.envs()
File "/usr/lib/python2.7/site-packages/salt/fileclient.py", line 1331, in envs
return self.channel.send(load)
File "/usr/lib/python2.7/site-packages/salt/fileserver/__init__.py", line 892, in send
return self.fs.envs()
File "/usr/lib/python2.7/site-packages/salt/fileserver/__init__.py", line 488, in envs
ret.update(self.servers[fstr](**kwargs))
File "/usr/lib/python2.7/site-packages/salt/fileserver/s3fs.py", line 93, in envs
metadata = _init()
File "/usr/lib/python2.7/site-packages/salt/fileserver/s3fs.py", line 354, in _init
metadata = _read_buckets_cache_file(cache_file)
File "/usr/lib/python2.7/site-packages/salt/fileserver/s3fs.py", line 553, in _read_buckets_cache_file
data = pickle.load(fp_)
File "/usr/lib64/python2.7/pickle.py", line 1378, in load
return Unpickler(file).load()
File "/usr/lib64/python2.7/pickle.py", line 858, in load
dispatch[key](self)
File "/usr/lib64/python2.7/pickle.py", line 966, in load_string
raise ValueError, "insecure string pickle"
ValueError: insecure string pickle

# Fixed code
def update():
    """
    Update the cache file for the bucket.
    """

    metadata = _init()

    if S3_SYNC_ON_UPDATE:
        # sync the buckets to the local cache
        log.info("Syncing local cache from S3...")
        for saltenv, env_meta in metadata.items():
            for bucket_files in _find_files(env_meta):
                for bucket, files in bucket_files.items():
                    for file_path in files:
                        cached_file_path = _get_cached_file_name(
                            bucket, saltenv, file_path
                        )
                        log.info("%s - %s : %s", bucket, saltenv, file_path)

                        # load the file from S3 if it's not in the cache or it's old
                        _get_file_from_s3(
                            metadata, saltenv, bucket, file_path, cached_file_path
                        )

        log.info("Sync local cache from S3 completed.")