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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 os
import sys
import glob
import lxml.etree
import Bcfg2.Server.Plugin
try:
import json
# py2.4 json library is structured differently
json.loads # pylint: disable=W0104
except (ImportError, AttributeError):
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 hostpath(self, host):
""" Get the path to the file that contains Ohai data for the
given host """
return os.path.join(self.dirname, "%s.json" % host)
def __setitem__(self, item, value):
if value is None:
# simply return if the client returned nothing
return
self.cache[item] = json.loads(value)
open(self.hostpath(item), 'w').write(value)
def __getitem__(self, item):
if item not in self.cache:
try:
data = open(self.hostpath(item)).read()
except IOError:
raise KeyError(item)
self.cache[item] = json.loads(data)
return self.cache[item]
def __delitem__(self, item):
if item in self.cache:
del self.cache[item]
try:
os.unlink(self.hostpath(item))
except OSError:
raise IndexError("Could not unlink %s: %s" % (self.hostpath(item),
sys.exc_info()[1]))
def __len__(self):
return len(glob.glob(self.hostpath('*')))
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):
Bcfg2.Server.Plugin.Plugin.__init__(self, core)
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
self.cache = OhaiCache(self.data)
def GetProbes(self, _):
return [self.probe]
def ReceiveData(self, meta, datalist):
if meta.hostname not in self.cache or \
self.cache[meta.hostname] != datalist[0].text:
self.cache[meta.hostname] = datalist[0].text
if self.core.metadata_cache_mode in ['cautious', 'aggressive']:
self.core.metadata_cache.expire(meta.hostname)
def get_additional_data(self, meta):
if meta.hostname in self.cache:
return self.cache[meta.hostname]
return dict()
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