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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 """
import os
import sys
import errno
import binascii
import lxml.etree
import Bcfg2.Options
import Bcfg2.Server
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
__author__ = 'chris.a.st.pierre@gmail.com'
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 (entry.get('update', 'false').lower() == "false" and
cfg.entries[path].get_pertinent_entries(entry,
metadata)):
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.debug_log("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.debug_log("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:
try:
self.write_data(lxml.etree.XML(data.text,
parser=Bcfg2.Server.XMLParser),
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_data(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))
create = False
try:
cfg.entries[filename].bind_entry(entry, metadata)
except Bcfg2.Server.Plugin.PluginExecutionError:
create = True
# get current entry data
if entry.text and entry.get("encoding") == "base64":
entrydata = binascii.a2b_base64(entry.text)
else:
entrydata = entry.text
if create:
self.logger.info("Writing new probed file %s" % fileloc)
self.write_file(fileloc, contents)
self.verify_file(filename, contents, metadata)
infoxml = os.path.join("%s%s" % (cfg.data, filename), "info.xml")
self.write_infoxml(infoxml, entry, data)
elif entrydata == contents:
self.debug_log("Existing %s contents match probed contents" %
filename)
return
elif (entry.get('update', 'false').lower() == "true"):
self.logger.info("Writing updated probed file %s" % fileloc)
self.write_file(fileloc, contents)
self.verify_file(filename, contents, metadata)
else:
self.logger.info("Skipping updated probed file %s" % fileloc)
return
def write_file(self, fileloc, contents):
try:
os.makedirs(os.path.dirname(fileloc))
except OSError:
err = sys.exc_info()[1]
if err.errno == errno.EEXIST:
pass
else:
self.logger.error("Could not create parent directories for %s: "
"%s" % (fileloc, err))
return
try:
open(fileloc, 'wb').write(contents)
except IOError:
err = sys.exc_info()[1]
self.logger.error("Could not write %s: %s" % (fileloc, err))
return
def verify_file(self, filename, contents, metadata):
# Service the FAM events queued up by the key generation so
# the data structure entries will be available for binding.
#
# NOTE: We wait for up to ten seconds. There is some potential
# for race condition, because if the file monitor doesn't get
# notified about the new key files in time, those entries
# won't be available for binding. In practice, this seems
# "good enough".
entry = self.entries[metadata.hostname][filename]
cfg = self.core.plugins['Cfg']
tries = 0
updated = False
while not updated:
if tries >= 10:
self.logger.error("%s still not registered" % filename)
return
self.core.fam.handle_events_in_interval(1)
try:
cfg.entries[filename].bind_entry(entry, metadata)
except Bcfg2.Server.Plugin.PluginExecutionError:
tries += 1
continue
# get current entry data
if entry.get("encoding") == "base64":
entrydata = binascii.a2b_base64(entry.text)
else:
entrydata = entry.text
if entrydata == contents:
updated = True
tries += 1
def write_infoxml(self, infoxml, entry, data):
""" write an info.xml for the file """
if os.path.exists(infoxml):
return
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)
try:
open(infoxml, "w").write(lxml.etree.tostring(root,
pretty_print=True))
except IOError:
err = sys.exc_info()[1]
self.logger.error("Could not write %s: %s" % (fileloc, err))
return
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