blob: edd5074d249331237b4d8472ee8c9361fd858794 [file] [log] [blame]
#!/usr/bin/env python3
# Copyright 2015 The Chromium Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.
import sys
import subprocess
"""Detect forced pushes (on the client) and prompt the user before going on."""
def read_from_tty():
try:
import posix # No way to do this on Windows, just give up there.
with open('/dev/tty') as tty_fd:
return tty_fd.readline().strip()
except:
return None
def Main():
# Allow force pushes in repos forked elsewhere (e.g. googlesource).
remote_url = sys.argv[2] if len(sys.argv) >= 2 else ''
if 'github.com' not in remote_url:
return 0
parts = sys.stdin.readline().split()
if len(parts) < 4:
return 0
local_ref, local_sha, remote_ref, remote_sha = parts
cmd = ['git', 'rev-list', '--count', remote_sha, '--not', local_sha,
'--max-count=1']
is_force_push = '0'
try:
is_force_push = subprocess.check_output(cmd).strip()
except(subprocess.CalledProcessError):
return 0
if is_force_push != '0':
sys.stderr.write('\033[31mWARNING: Force pushing will break the ' +
'github.com -> googlesource.com mirroring.\033[0m\n' +
'This is almost certainly a bad idea.\n')
sys.stderr.write('Type y to continue: ')
if read_from_tty() != 'y':
return 1
return 0
if __name__ == '__main__':
sys.exit(Main())