pre-commit

#!/usr/bin/env python3

# This is a pre-commit hook that ensures attempts to commit files that
# are larger than 100 MB to your _local_ repo fail, with a helpful error
# message. This is the python version.
# 
# This prevents the local repo from getting out of sync with the Github 
# repo. To install
# 1) Install gitpython
#    $ pip install gitpython
# 2) Change this file to executable: 
#    $ chmod a+x pre-commit
# 3) Move into the .git/hooks directory at the top-level of the repo
#    $ mv pre-commit .git/hooks/
#
# See blog post on https://kiwidamien.github.io/prevent-big-commits

from git import Repo
from gitdb.exc import BadName
import os
import sys


repo = Repo('.')
limit = 10**8

try:
    filenames = (diff_obj.a_path for diff_obj in repo.index.diff('HEAD'))
except BadName:
    # new repo, no 'HEAD' or master until first commit completed
    filenames = (filename for filename, _ in repo.index.entries.keys())

for filename in filenames:
    filesize = os.stat(filename).st_size
    if filesize > limit:
        print(f"""
              {filename} ({filesize // 10**6} MB) is larger than the {limit // 10**6} MB limit
              Commit aborted""")
        sys.exit(1)

Have you ever tested this after deleting a file from a repo? It seems as if filenames may include the deleted file's name, causing FileNotFoundError in os.stat(filename).st_size.