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#!/usr/bin/env python3
# Copyright (c) 2021 The Bitcoin Core developers
# Distributed under the MIT software license, see the accompanying
# file COPYING or http://www.opensource.org/licenses/mit-license.php.
'''
Common utility functions
'''
import shutil
import sys
import os
from typing import List
def determine_wellknown_cmd(envvar, progname) -> List[str]:
maybe_env = os.getenv(envvar)
maybe_which = shutil.which(progname)
if maybe_env:
return maybe_env.split(' ') # Well-known vars are often meant to be word-split
elif maybe_which:
return [ maybe_which ]
else:
sys.exit(f"{progname} not found")
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