config.py

# Note this will not override existing environment settings
#from dotenv import load_dotenv
import os

#load_dotenv()

def file_must_exist(f):
    if os.path.exists(f): return
    msg = f + " not found."
    try: 
        raise FileNotFoundError(msg)
    except:
        raise IOError(msg)

class Config(object):
    """ Read environment here to create configuration data. """

    # Config.LMUTIL will be set to a list of args to pass to subprocess.

    TEST_MODE = False
    TEST_FILE = 'lmstat.txt'

    DBSERVER   = os.environ.get('DBSERVER')
    DATABASE   = os.environ.get('DATABASE')
    DBUSER     = os.environ.get('DBUSER')
    DBPASSWORD = os.environ.get('DBPASSWORD')
   
    LMHOME = os.environ.get('LMHOME') or '/home/flexlm'
    LICENSE = os.environ.get('LICENSE') or 'service.txt'
    _LMUTIL = os.environ.get('LMUTIL')
    if _LMUTIL:
        # Holy cow but Windows was super fussy about this section.
        # It would not accept running the actual file with .exe on it.
        # It was impossible to pass spaces in args. Gag me, let me have Linux.
        os.chdir(LMHOME)
        file_must_exist(_LMUTIL)
        file_must_exist(LICENSE)
        LMUTIL = ["/lib/x86_64-linux-gnu/ld-2.24.so", _LMUTIL, 'lmstat', '-c', LICENSE, '-a']
    else:
        print("TEST MODE INVOKED.")
        TEST_MODE = True

    if not TEST_MODE:
        file_must_exist(LICENSE)

    PORT = os.environ.get('PORT') or 5000
    
    pass

# That's all!