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def set_cls_attrs(**injected_attrs):
    def wrap_cls(cls):
        # inject new class attr
        for _attr_name, _attr_val in injected_attrs.items():
            setattr(cls, _attr_name, _attr_val)

        # wrapper class based on original cls
        class wrapper_cls(cls):
            def __init__(self, *args, **kw):

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import argparse
import json
import subprocess
from collections import defaultdict


def _execute(*args) -> str:
    p = subprocess.Popen(args, stdout=subprocess.PIPE)
    res, _ = p.communicate()
    return res.decode('utf8')

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# create data dirs
mkdir -p /mysql/data/db
mkdir -p /mysql/conf

# customizing mysql instance
echo [mysqld] > /mysql/conf/custom_options.cnf
echo innodb_buffer_pool_size=100M >> /mysql/conf/custom_options.cnf

# run mysql image
docker run -d --name mysql-db \

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# create ftp dir
mkdir -p /ftp/ftp-user
# change creds
chmod 0777 -R /ftp

# run vsftp
docker run --rm -it \
 --name ftpd_server \
 -p 21:21 \
 -p 20:20 \