Script for fetching and checking out a bunch of Git repositories at a time (used for CoFH/cofh.github.io)

checkout.py

import os
import sys
from subprocess import Popen, PIPE
from threading import Thread

REPOS = [
    'RedstoneFlux',
    'CoFHCore',
    'CoFHWorld',
    'ThermalFoundation',
    'ThermalExpansion',
    'ThermalDynamics',
    'ThermalCultivation',
    'ThermalInnovation',
    'RedstoneArsenal'
]

print('\nFetching repositories...')

def fetch(repo):
    Popen(['git', 'fetch'], cwd=os.path.join(os.getcwd(), repo)).wait()
    sys.stdout.write('- {}\n'.format(repo))

threads = [Thread(target=fetch, args=(repo,)) for repo in REPOS]

for t in threads:
    t.start()

for t in threads:
    t.join()

for repo in REPOS:
    print('')

    cwd = os.path.join(os.getcwd(), repo)

    current_commit_id = Popen(['git', 'rev-parse', '--short', 'HEAD'], stdout=PIPE, cwd=cwd).communicate()[0].strip()

    while True:
        commit_id = raw_input('Commit ID for {} ({}): '.format(repo, current_commit_id))
        if commit_id == '':
            break

        print('Checking out {}...'.format(commit_id))
        git_checkout = Popen(['git', '-c', 'advice.detachedHead=false', 'checkout', commit_id], cwd=cwd)
        git_checkout.wait()

        if git_checkout.returncode == 0:
            break