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""" This module allows you to probe a client for a file, which is then
added to the specification. On subsequent runs, the file will be
replaced on the client if it is missing; if it has changed on the
client, it can either be updated in the specification or replaced on
the client """
__revision__ = '$Revision: 1465 $'
import os
import errno
import binascii
import lxml.etree
import Bcfg2.Options
import Bcfg2.Server.Plugin
probecode = """#!/usr/bin/env python
import os
import pwd
import grp
import binascii
import lxml.etree
path = "%s"
if not os.path.exists(path):
print "%%s does not exist" %% path
raise SystemExit(1)
stat = os.stat(path)
data = lxml.etree.Element("ProbedFileData",
name=path,
owner=pwd.getpwuid(stat[4])[0],
group=grp.getgrgid(stat[5])[0],
perms=oct(stat[0] & 07777))
data.text = binascii.b2a_base64(open(path).read())
print lxml.etree.tostring(data)
"""
class FileProbesConfig(Bcfg2.Server.Plugin.SingleXMLFileBacked,
Bcfg2.Server.Plugin.StructFile):
""" Config file handler for FileProbes """
def __init__(self, filename, fam):
Bcfg2.Server.Plugin.SingleXMLFileBacked.__init__(self, filename, fam)
Bcfg2.Server.Plugin.StructFile.__init__(self, filename)
class FileProbes(Bcfg2.Server.Plugin.Plugin,
Bcfg2.Server.Plugin.Probing):
""" This module allows you to probe a client for a file, which is then
added to the specification. On subsequent runs, the file will be
replaced on the client if it is missing; if it has changed on the
client, it can either be updated in the specification or replaced on
the client """
name = 'FileProbes'
experimental = True
__version__ = '$Id$'
__author__ = 'stpierreca@ornl.gov'
def __init__(self, core, datastore):
Bcfg2.Server.Plugin.Plugin.__init__(self, core, datastore)
Bcfg2.Server.Plugin.Probing.__init__(self)
self.config = FileProbesConfig(os.path.join(self.data, 'config.xml'),
core.fam)
self.entries = dict()
self.probes = dict()
def GetProbes(self, metadata):
"""Return a set of probes for execution on client."""
if metadata.hostname not in self.probes:
cfg = self.core.plugins['Cfg']
self.entries[metadata.hostname] = dict()
self.probes[metadata.hostname] = []
for entry in self.config.Match(metadata):
path = entry.get("name")
# do not probe for files that are already in Cfg and
# for which update is false; we can't possibly do
# anything with the data we get from such a probe
try:
if (cfg.entries[path].get_pertinent_entries(metadata) and
entry.get('update', 'false').lower() == "false"):
continue
except (KeyError, Bcfg2.Server.Plugin.PluginExecutionError):
pass
self.entries[metadata.hostname][path] = entry
probe = lxml.etree.Element('probe', name=path,
source=self.name,
interpreter="/usr/bin/env python")
probe.text = probecode % path
self.probes[metadata.hostname].append(probe)
self.logger.debug("Adding file probe for %s to %s" %
(path, metadata.hostname))
return self.probes[metadata.hostname]
def ReceiveData(self, metadata, datalist):
"""Receive data from probe."""
self.logger.debug("Receiving file probe data from %s" %
metadata.hostname)
for data in datalist:
if data.text is None:
self.logger.error("Got null response to %s file probe from %s" %
(data.get('name'), metadata.hostname))
else:
self.logger.debug("%s:fileprobe:%s:%s" %
(metadata.hostname,
data.get("name"),
data.text))
try:
filedata = lxml.etree.XML(data.text)
self.write_file(filedata, metadata)
except lxml.etree.XMLSyntaxError:
# if we didn't get XML back from the probe, assume
# it's an error message
self.logger.error(data.text)
def write_file(self, data, metadata):
"""Write the probed file data to the bcfg2 specification."""
filename = data.get("name")
contents = binascii.a2b_base64(data.text)
entry = self.entries[metadata.hostname][filename]
cfg = self.core.plugins['Cfg']
specific = "%s.H_%s" % (os.path.basename(filename), metadata.hostname)
# we can't use os.path.join() for this because specific
# already has a leading /, which confuses os.path.join()
fileloc = "%s%s" % (cfg.data, os.path.join(filename, specific))
if filename not in cfg.entries.keys():
self.logger.info("Writing new probed file %s" % fileloc)
try:
os.makedirs(os.path.dirname(fileloc))
except OSError, err:
if err.errno == errno.EEXIST:
pass
else:
raise
open(fileloc, 'wb').write(contents)
infoxml = os.path.join("%s%s" % (cfg.data, filename),
"info.xml")
self.write_infoxml(infoxml, entry, data)
else:
try:
cfgentry = \
cfg.entries[filename].get_pertinent_entries(metadata)[0]
except Bcfg2.Server.Plugin.PluginExecutionError:
self.logger.info("Writing new probed file %s" % fileloc)
open(fileloc, 'wb').write(contents)
return
if cfgentry.data == contents:
self.logger.debug("Existing %s contents match probed contents" %
filename)
elif (entry.get('update', 'false').lower() == "true"):
self.logger.info("Writing updated probed file %s" % fileloc)
open(fileloc, 'wb').write(contents)
else:
self.logger.info("Skipping updated probed file %s" % fileloc)
def write_infoxml(self, infoxml, entry, data):
""" write an info.xml for the file """
self.logger.info("Writing info.xml at %s for %s" %
(infoxml, data.get("name")))
info = \
lxml.etree.Element("Info",
owner=data.get("owner",
Bcfg2.Options.MDATA_OWNER.value),
group=data.get("group",
Bcfg2.Options.MDATA_GROUP.value),
perms=data.get("perms",
Bcfg2.Options.MDATA_PERMS.value),
encoding=entry.get("encoding",
Bcfg2.Options.ENCODING.value))
root = lxml.etree.Element("FileInfo")
root.append(info)
open(infoxml, "w").write(lxml.etree.tostring(root,
pretty_print=True))
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