Git pre-commit hook to checkstyle python code with flake8 and run all PyUnit tests

pre-commit

#!/usr/bin/env python3
#
# A pre-commit hook to verify PEP8 conformity using flake8
# and to run all available unit tests

import subprocess
import sys
import os
import glob

# Try to read the GIT_DIR envvar, which is set if this is being called as a git pre-commit hook.
try: 
    path = os.environ['GIT_DIR']
# If it is not set, a KeyError is raised, which is taken as if this is invoked from the command line, using the cwd instead.
# This requires calling this script from the correct directory!
except:
    path = os.getcwd()
    
if (subprocess.call(["flake8", path]) != 0):
    print("Found PEP8 non-conformities! Aborting commit...")
    sys.exit(1)

for test_file in glob.glob(path + "/tests/*.py"):
    if (subprocess.call(["python3", "-m", "unittest", test_file], stdin=None, stdout=None, stderr=subprocess.DEVNULL) != 0):
        print("Unit tests failed in " + test_file + "! Aborting commit...")
        sys.exit(1)

print("Style check and unit tests successful, committing!")