Find potentially active Git Hooks and print their SHA256 value

FindGitHooks.py

import os
import hashlib
import json

def sha256sum(filename):
    h  = hashlib.sha256()
    b  = bytearray(128*1024)
    mv = memoryview(b)
    with open(filename, 'rb', buffering=0) as f:
        for n in iter(lambda : f.readinto(mv), 0):
            h.update(mv[:n])
    return h.hexdigest()

print("Collecting Repos")
repos = []
hook_hashes = {}

for root, dirs, files in os.walk("/"):
    #print(root)
    if ".git" in dirs:
        #print(("%s/.git/ found" % root))
        loc = os.path.join(root, ".git", "hooks")
        repos.append(loc)
print("Found %d repos" % len(repos))
print("checking git hooks")
for hook_dir in repos:
    for root, dirs, files in os.walk(hook_dir):
        for f in files:
            if ".sample" in f:
                continue
            fp = os.path.join(root, f)
            fh = sha256sum(fp)
            print(fp)
            print(fh)
            print("")