dirhash.py

import os
import sys
import os.path
import hashlib

base = sys.argv[1]
if not os.path.exists(base):
    sys.exit(1)

dirs = []
files = []

for root, _dirs, _files in os.walk(base):
    for dir in _dirs:
        dirs.append(os.path.join(root, dir)[len(base) + 1 :])
    for file in _files:
        files.append(os.path.join(root, file)[len(base) + 1 :])

dirs.sort()
files.sort()

sep = b"\0"
hash = hashlib.sha1()
for dir in dirs:
    hash.update(dir.encode())
    hash.update(sep)
for file in files:
    with open(os.path.join(base, file), "rb") as f:
        hash.update(file.encode())
        hash.update(f.read())
        hash.update(sep)

print(hash.hexdigest())