Add to build steps > run script in xcode

version.py

#!/usr/bin/env python
# encoding: utf-8

import sys
import os
import subprocess
import plistlib


def gitVersion(gitPath):

    def parse(build):
        
        parts = build.replace('-dirty', '').split('-')
        
        if len(parts) > 1: return "%s.%s" % (parts[0], parts[1])
        if len(parts) > 0: return "%s.0" % parts[0]
        
        raise AssertionError('Could not parse version')

    def sub(cmd):
        cmd = "cd '%s'; %s" % (gitPath, cmd)
        return subprocess.check_output(cmd, shell=True).strip()

    return {
        "version": parse(sub('git describe --tags').strip('v')),
        "hash": sub('git describe --always --dirty'),
        "build": sub('git rev-list --all | wc -l'),
    }

def writePlist(path, data):

    if not os.path.exists(path):
        sys.exit("Could not find plist at: %s" % path)

    try:
        plistData = plistlib.readPlist(path)
        plist = plistlib
    except Exception, e:
        import biplist
        plistData = biplist.readPlist(path)
        plist = biplist
        
    for k, v in data.iteritems():
        plistData[k] = v

    plist.writePlist(plistData, path)



def run():

    applicationInfoListPath = os.path.realpath(os.path.join(
        os.environ.get('BUILT_PRODUCTS_DIR'), 
        os.environ.get('INFOPLIST_PATH')))

    applicationDSYMListPath = os.path.realpath(os.path.join(
        os.environ['DWARF_DSYM_FOLDER_PATH'], 
        os.environ['DWARF_DSYM_FILE_NAME'], 
        "Contents", "Info.plist"))

    version = gitVersion(os.path.dirname(__file__))

    for plistPath in [applicationInfoListPath, applicationDSYMListPath]:
        writePlist(plistPath, {
            "CFBundleVersion": version["build"],
            "CFBundleShortVersionString": version["version"],
        })

run()