fabfile.py

enum = 'http://readyroom/catalog/enumerate/'

def get_hosts(which=None):
    qs = ''
    if which:
        qs = '?which=%s' % which
    ret = urllib.urlopen(enum + 'systems/' + qs).read()
    return ret.split()

env.roledefs.update({
    'all': lambda: get_hosts(),
    'all_no_macs': lambda: filter(lambda x: 'bender' not in x and 'meeting' not in x, get_hosts()),
    'vms': lambda: get_hosts('vms'),
    'clients': lambda: get_hosts('clients'),
    'internals': lambda: get_hosts('internals')
})