configmap.py

#!/usr/bin/env python

import sys
import os
import pathlib
from subprocess import call

ENV_DIR = ".env"
ENV =  os.environ.get('ENV')
SERVICE = os.environ.get('SERVICE')
NAMESPACE = os.environ.get('NAMESPACE')
FILE= os.environ.get('FILE')
CONFIG_FILES = [
  os.path.join(ENV_DIR, "{}.env".format(ENV)),
  os.path.join(ENV_DIR, "{}.env".format(SERVICE)),
  os.path.join(ENV_DIR, "{}.env".format(NAMESPACE)),
  os.path.join(ENV_DIR, ENV, "{}.env".format(SERVICE)),
  os.path.join(ENV_DIR, ENV, NAMESPACE, "{}.env".format(SERVICE))
]

values = dict()

for file in CONFIG_FILES:
    if os.path.isfile(file):
        for line in open(file, 'r'):
            key, value = line.rstrip().split("=", 1)
            values[key] = value

with open(FILE, 'w') as f:
    for key, value in values.items():
        f.write("{}={}\n".format(key, value))