Python script to diff 2 global configurations in CloudStack

cfgdiff.py

# This script takes 2 json files as input. The json file describes the global configuration of a CloudStack installation
# To generate a json file of the configuration, use cloudmonkey:
#
# cloudmonkey -c staging.cfg 
# > set display json
# > exit
# cloudmonkey -c production.cfg 
# > set display json
# > exit
# cloudmonkey -c staging.cfg list configurations > staging.json
# cloudmonkey -c production.cfg list configurations  >  production.json

import json

def json_to_dict(jsonfile):
    j = json.load(open(jsonfile, 'rb'))
    a1 = map(lambda x: {x['name']: x.get('value')}, j['configuration'])
    a2 = reduce( lambda x, y: x.update(y) or x, a1, {})
    return a2

def print_diff(cfg1, cfg2):
   diffkeys = [k for k in cfg1 if cfg1[k] != cfg2[k]]
   for k in diffkeys:
      print k, ':', cfg1[k], '->', cfg2[k]

print_diff(json_to_dict('staging.json'), json_to_dict('production.json'))