A short PyObjC script to set git-config user parameters via the Address Book Framework.

ABGitConfig.py

#!/usr/bin/python

from objc import YES, NO, NULL
from Foundation import *
from AddressBook import *
import os

# Set the path to git
GIT = "/usr/local/bin/git"

# Get the current user's address book record
myPerson = ABAddressBook.sharedAddressBook().me()

# Get the user's full name
fullName = ' '.join(map(myPerson.valueForProperty_, [kABFirstNameProperty, kABLastNameProperty]))

# Get the user's primary email
emailProperty = myPerson.valueForProperty_(kABEmailProperty)
identifier = emailProperty.primaryIdentifier()
email = emailProperty.valueForIdentifier_(identifier)

# Set the appropriate settings using git-config
os.system("%s config --global user.name '%s'" % (GIT, fullName))
os.system("%s config --global user.email '%s'" % (GIT, email))