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"""The Ohai plugin is used to detect information about the client
operating system using ohai
(http://wiki.opscode.com/display/chef/Ohai) """
import lxml.etree
import os
import Bcfg2.Server.Plugin
try:
import json
except ImportError:
import simplejson as json
PROBECODE = """#!/bin/sh
export PATH=$PATH:/sbin:/usr/sbin
if type ohai >& /dev/null; then
ohai
else
# an empty dict, so "'foo' in metadata.Ohai" tests succeed
echo '{}'
fi
"""
class OhaiCache(object):
""" Storage for Ohai output on the local filesystem so that the
output can be used by bcfg2-info, etc. """
def __init__(self, dirname):
self.dirname = dirname
self.cache = dict()
def __setitem__(self, item, value):
if value == None:
# simply return if the client returned nothing
return
self.cache[item] = json.loads(value)
open("%s/%s.json" % (self.dirname, item), 'w').write(value)
def __getitem__(self, item):
if item not in self.cache:
try:
data = open("%s/%s.json" % (self.dirname, item)).read()
except:
raise KeyError(item)
self.cache[item] = json.loads(data)
return self.cache[item]
def __iter__(self):
data = list(self.cache.keys())
data.extend([x[:-5] for x in os.listdir(self.dirname)])
return data.__iter__()
class Ohai(Bcfg2.Server.Plugin.Plugin,
Bcfg2.Server.Plugin.Probing,
Bcfg2.Server.Plugin.Connector):
"""The Ohai plugin is used to detect information
about the client operating system.
"""
def __init__(self, core, datastore):
Bcfg2.Server.Plugin.Plugin.__init__(self, core, datastore)
Bcfg2.Server.Plugin.Probing.__init__(self)
Bcfg2.Server.Plugin.Connector.__init__(self)
self.probe = lxml.etree.Element('probe', name='Ohai', source='Ohai',
interpreter='/bin/sh')
self.probe.text = PROBECODE
try:
os.stat(self.data)
except OSError:
os.makedirs(self.data)
self.cache = OhaiCache(self.data)
def GetProbes(self, _):
return [self.probe]
def ReceiveData(self, meta, datalist):
self.cache[meta.hostname] = datalist[0].text
def get_additional_data(self, meta):
if meta.hostname in self.cache:
return self.cache[meta.hostname]
return dict()
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