Update all Git repositories in the current folder, undoing all local changes if needed

git-force-update-all.py

#!/usr/bin/env python

import os
import subprocess
import sys


confirmation = raw_input("This script may DISCARD YOUR UNCOMMITTED CHANGES. Are you sure (Y/N)? ")
if confirmation.lower() != "y":
    sys.exit(1)

workdir = os.getcwd()
repos = [os.path.join(workdir, directory)
         for directory in os.listdir(workdir)
         if os.path.isdir(directory) and os.path.isdir(os.path.join(workdir, directory, ".git"))]

for repo in repos:
    print "-" * 30
    print "Updating {0}...".format(os.path.basename(repo))

    os.chdir(repo)
    exitcode = subprocess.call("git pull --ff-only || (git reset --hard ; git checkout -- . ; git ls-files -o | xargs rm ; git pull -f)", shell=True)
    os.chdir("..")

    print ""