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"""Procedures that operate on files/ directories"""
import hashlib
import os
from functools import partial
def get_dir_hash(directory: str) -> str:
"""Return the hash of a DIRECTORY"""
md5hash = hashlib.md5()
if not os.path.exists(directory):
raise FileNotFoundError
for root, _, files in os.walk(directory):
for names in files:
file_path = os.path.join(root, names)
with open(file_path, "rb") as file_:
for buf in iter(partial(file_.read, 4096), b''):
md5hash.update(bytearray(hashlib.md5(buf).hexdigest(),
"utf-8"))
return md5hash.hexdigest()
def lookup_file(environ_var: str,
root_dir: str,
file_name: str) -> str:
"""Look up FILE_NAME in the path defined by ENVIRON_VAR/ROOT_DIR/; If
ENVIRON_VAR/ROOT_DIR/FILE_NAME does not exist, raise an exception.
Otherwise return ENVIRON_VAR/ROOT_DIR/FILE_NAME.
"""
_dir = os.environ.get(environ_var)
if _dir:
_file = os.path.join(_dir, root_dir, file_name)
if os.path.isfile(_file):
return _file
raise FileNotFoundError
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