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#!/usr/bin/env python | |
# | |
# Bug Prediction script inspired by: | |
# http://google-engtools.blogspot.com/2011/12/bug-prediction-at-google.html | |
# Roman Bogorodskiy <bogorodskiy@gmail.com> | |
# | |
from __future__ import print_function | |
import argparse | |
import math | |
import re | |
import sys | |
import time | |
from operator import itemgetter | |
import git | |
def calc_score(commit_ts, first_commit_ts, now_ts): | |
t = 1 - float(now_ts - commit_ts) / (now_ts - first_commit_ts) | |
assert 0 <= t <= 1 | |
return 1.0 / (1 + math.exp(-12 * t + 12)) | |
def calculate_scores(files, first_commit_ts, now_ts): | |
result = {} | |
for f in files.iterkeys(): | |
file_score = 0 | |
for ts in files[f]: | |
file_score += calc_score(ts, first_commit_ts, now_ts) | |
result[f] = file_score | |
return result | |
if __name__ == "__main__": | |
parser = argparse.ArgumentParser() | |
parser.add_argument('-e', dest='expr', type=str, | |
default="Security:", | |
help="Regular expression to search for in commit log") | |
parser.add_argument('-l', dest='limit', type=int, | |
default=None, help="Number of results to show") | |
parser.add_argument('path', type=str, nargs='?', | |
default=".", help="Repository path") | |
args = parser.parse_args() | |
try: | |
repo = git.Repo(args.path) | |
except git.exc.InvalidGitRepositoryError: | |
print("Invalid git repository: %s" % args.path, file=sys.stderr) | |
sys.exit(1) | |
filter_re = re.compile(args.expr) | |
dangerous_files = {} | |
commits = matches = 1 | |
for commit in repo.iter_commits('master'): | |
if commits == 1 or commits % 100 == 0: | |
print(commits, end='') | |
elif commits % 10: | |
print(".", end='') | |
if filter_re.search(commit.message): | |
matches += 1 | |
for f in commit.stats.files.keys(): | |
if f not in dangerous_files: | |
dangerous_files[f] = [commit.committed_date, ] | |
else: | |
dangerous_files[f].append(commit.committed_date) | |
commits += 1 | |
print(commits) | |
first_commit_ts = commit.committed_date | |
scores = calculate_scores(dangerous_files, | |
first_commit_ts, int(time.time())) | |
for i in sorted(scores.items(), key=itemgetter(1), | |
reverse=True)[:args.limit]: | |
print (i[0], i[1]) |
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